asm.h@ 62534

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1	/** @file
2	* IPRT - Assembly Functions.
3	*/
4
5	/*
6	* Copyright (C) 2006-2016 Oracle Corporation
7	*
8	* This file is part of VirtualBox Open Source Edition (OSE), as
9	* available from http://www.virtualbox.org. This file is free software;
10	* you can redistribute it and/or modify it under the terms of the GNU
11	* General Public License (GPL) as published by the Free Software
12	* Foundation, in version 2 as it comes in the "COPYING" file of the
13	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
14	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
15	*
16	* The contents of this file may alternatively be used under the terms
17	* of the Common Development and Distribution License Version 1.0
18	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
19	* VirtualBox OSE distribution, in which case the provisions of the
20	* CDDL are applicable instead of those of the GPL.
21	*
22	* You may elect to license modified versions of this file under the
23	* terms and conditions of either the GPL or the CDDL or both.
24	*/
25
26	#ifndef ___iprt_asm_h
27	#define ___iprt_asm_h
28
29	#include <iprt/cdefs.h>
30	#include <iprt/types.h>
31	#include <iprt/assert.h>
32	/** @def RT_INLINE_ASM_USES_INTRIN
33	* Defined as 1 if we're using a _MSC_VER 1400.
34	* Otherwise defined as 0.
35	*/
36
37	/* Solaris 10 header ugliness */
38	#ifdef u
39	# undef u
40	#endif
41
42	#if defined(_MSC_VER) && RT_INLINE_ASM_USES_INTRIN
43	# include <intrin.h>
44	/* Emit the intrinsics at all optimization levels. */
45	# pragma intrinsic(_ReadWriteBarrier)
46	# pragma intrinsic(__cpuid)
47	# pragma intrinsic(__stosd)
48	# pragma intrinsic(__stosw)
49	# pragma intrinsic(__stosb)
50	# pragma intrinsic(_BitScanForward)
51	# pragma intrinsic(_BitScanReverse)
52	# pragma intrinsic(_bittest)
53	# pragma intrinsic(_bittestandset)
54	# pragma intrinsic(_bittestandreset)
55	# pragma intrinsic(_bittestandcomplement)
56	# pragma intrinsic(_byteswap_ushort)
57	# pragma intrinsic(_byteswap_ulong)
58	# pragma intrinsic(_interlockedbittestandset)
59	# pragma intrinsic(_interlockedbittestandreset)
60	# pragma intrinsic(_InterlockedAnd)
61	# pragma intrinsic(_InterlockedOr)
62	# pragma intrinsic(_InterlockedIncrement)
63	# pragma intrinsic(_InterlockedDecrement)
64	# pragma intrinsic(_InterlockedExchange)
65	# pragma intrinsic(_InterlockedExchangeAdd)
66	# pragma intrinsic(_InterlockedCompareExchange)
67	# pragma intrinsic(_InterlockedCompareExchange64)
68	# pragma intrinsic(_rotl)
69	# pragma intrinsic(_rotr)
70	# pragma intrinsic(_rotl64)
71	# pragma intrinsic(_rotr64)
72	# ifdef RT_ARCH_AMD64
73	# pragma intrinsic(__stosq)
74	# pragma intrinsic(_byteswap_uint64)
75	# pragma intrinsic(_InterlockedExchange64)
76	# pragma intrinsic(_InterlockedExchangeAdd64)
77	# pragma intrinsic(_InterlockedAnd64)
78	# pragma intrinsic(_InterlockedOr64)
79	# pragma intrinsic(_InterlockedIncrement64)
80	# pragma intrinsic(_InterlockedDecrement64)
81	# endif
82	#endif
83
84	/*
85	* Include #pragma aux definitions for Watcom C/C++.
86	*/
87	#if defined(__WATCOMC__) && ARCH_BITS == 16 && defined(RT_ARCH_X86)
88	# include "asm-watcom-x86-16.h"
89	#elif defined(__WATCOMC__) && ARCH_BITS == 32 && defined(RT_ARCH_X86)
90	# include "asm-watcom-x86-32.h"
91	#endif
92
93
94
95	/** @defgroup grp_rt_asm ASM - Assembly Routines
96	* @ingroup grp_rt
97	*
98	* @remarks The difference between ordered and unordered atomic operations are that
99	* the former will complete outstanding reads and writes before continuing
100	* while the latter doesn't make any promises about the order. Ordered
101	* operations doesn't, it seems, make any 100% promise wrt to whether
102	* the operation will complete before any subsequent memory access.
103	* (please, correct if wrong.)
104	*
105	* ASMAtomicSomething operations are all ordered, while ASMAtomicUoSomething
106	* are unordered (note the Uo).
107	*
108	* @remarks Some remarks about __volatile__: Without this keyword gcc is allowed to reorder
109	* or even optimize assembler instructions away. For instance, in the following code
110	* the second rdmsr instruction is optimized away because gcc treats that instruction
111	* as deterministic:
112	*
113	* @code
114	* static inline uint64_t rdmsr_low(int idx)
115	* {
116	* uint32_t low;
117	* __asm__ ("rdmsr" : "=a"(low) : "c"(idx) : "edx");
118	* }
119	* ...
120	* uint32_t msr1 = rdmsr_low(1);
121	* foo(msr1);
122	* msr1 = rdmsr_low(1);
123	* bar(msr1);
124	* @endcode
125	*
126	* The input parameter of rdmsr_low is the same for both calls and therefore gcc will
127	* use the result of the first call as input parameter for bar() as well. For rdmsr this
128	* is not acceptable as this instruction is _not_ deterministic. This applies to reading
129	* machine status information in general.
130	*
131	* @{
132	*/
133
134
135	/** @def RT_INLINE_ASM_GCC_4_3_X_X86
136	* Used to work around some 4.3.x register allocation issues in this version of
137	* the compiler. So far this workaround is still required for 4.4 and 4.5 but
138	* definitely not for 5.x */
139	#define RT_INLINE_ASM_GCC_4_3_X_X86 (RT_GNUC_PREREQ(4, 3) && !RT_GNUC_PREREQ(5, 0) && defined(__i386__))
140	#ifndef RT_INLINE_ASM_GCC_4_3_X_X86
141	# define RT_INLINE_ASM_GCC_4_3_X_X86 0
142	#endif
143
144	/** @def RT_INLINE_DONT_MIX_CMPXCHG8B_AND_PIC
145	* i686-apple-darwin9-gcc-4.0.1 (GCC) 4.0.1 (Apple Inc. build 5493) screws up
146	* RTSemRWRequestWrite semsemrw-lockless-generic.cpp in release builds. PIC
147	* mode, x86.
148	*
149	* Some gcc 4.3.x versions may have register allocation issues with cmpxchg8b
150	* when in PIC mode on x86.
151	*/
152	#ifndef RT_INLINE_DONT_MIX_CMPXCHG8B_AND_PIC
153	# if defined(DOXYGEN_RUNNING) \|\| defined(__WATCOMC__) /* Watcom has trouble with the expression below */
154	# define RT_INLINE_DONT_MIX_CMPXCHG8B_AND_PIC 1
155	# else
156	# define RT_INLINE_DONT_MIX_CMPXCHG8B_AND_PIC \
157	( (defined(PIC) \|\| defined(__PIC__)) \
158	&& defined(RT_ARCH_X86) \
159	&& ( RT_INLINE_ASM_GCC_4_3_X_X86 \
160	\|\| defined(RT_OS_DARWIN)) )
161	# endif
162	#endif
163
164
165	/** @def ASMReturnAddress
166	* Gets the return address of the current (or calling if you like) function or method.
167	*/
168	#ifdef _MSC_VER
169	# ifdef __cplusplus
170	extern "C"
171	# endif
172	void * _ReturnAddress(void);
173	# pragma intrinsic(_ReturnAddress)
174	# define ASMReturnAddress() _ReturnAddress()
175	#elif defined(__GNUC__) \|\| defined(DOXYGEN_RUNNING)
176	# define ASMReturnAddress() __builtin_return_address(0)
177	#elif defined(__WATCOMC__)
178	# define ASMReturnAddress() Watcom_does_not_appear_to_have_intrinsic_return_address_function()
179	#else
180	# error "Unsupported compiler."
181	#endif
182
183
184	/**
185	* Compiler memory barrier.
186	*
187	* Ensure that the compiler does not use any cached (register/tmp stack) memory
188	* values or any outstanding writes when returning from this function.
189	*
190	* This function must be used if non-volatile data is modified by a
191	* device or the VMM. Typical cases are port access, MMIO access,
192	* trapping instruction, etc.
193	*/
194	#if RT_INLINE_ASM_GNU_STYLE
195	# define ASMCompilerBarrier() do { __asm__ __volatile__("" : : : "memory"); } while (0)
196	#elif RT_INLINE_ASM_USES_INTRIN
197	# define ASMCompilerBarrier() do { _ReadWriteBarrier(); } while (0)
198	#elif defined(__WATCOMC__)
199	void ASMCompilerBarrier(void);
200	#else /* 2003 should have _ReadWriteBarrier() but I guess we're at 2002 level then... */
201	DECLINLINE(void) ASMCompilerBarrier(void)
202	{
203	__asm
204	{
205	}
206	}
207	#endif
208
209
210	/** @def ASMBreakpoint
211	* Debugger Breakpoint.
212	* @deprecated Use RT_BREAKPOINT instead.
213	* @internal
214	*/
215	#define ASMBreakpoint() RT_BREAKPOINT()
216
217
218	/**
219	* Spinloop hint for platforms that have these, empty function on the other
220	* platforms.
221	*
222	* x86 & AMD64: The PAUSE variant of NOP for helping hyperthreaded CPUs detecting
223	* spin locks.
224	*/
225	#if RT_INLINE_ASM_EXTERNAL && (defined(RT_ARCH_AMD64) \|\| defined(RT_ARCH_X86))
226	DECLASM(void) ASMNopPause(void);
227	#else
228	DECLINLINE(void) ASMNopPause(void)
229	{
230	# if defined(RT_ARCH_AMD64) \|\| defined(RT_ARCH_X86)
231	# if RT_INLINE_ASM_GNU_STYLE
232	__asm__ __volatile__(".byte 0xf3,0x90\n\t");
233	# else
234	__asm {
235	_emit 0f3h
236	_emit 090h
237	}
238	# endif
239	# else
240	/* dummy */
241	# endif
242	}
243	#endif
244
245
246	/**
247	* Atomically Exchange an unsigned 8-bit value, ordered.
248	*
249	* @returns Current *pu8 value
250	* @param pu8 Pointer to the 8-bit variable to update.
251	* @param u8 The 8-bit value to assign to *pu8.
252	*/
253	#if RT_INLINE_ASM_EXTERNAL
254	DECLASM(uint8_t) ASMAtomicXchgU8(volatile uint8_t *pu8, uint8_t u8);
255	#else
256	DECLINLINE(uint8_t) ASMAtomicXchgU8(volatile uint8_t *pu8, uint8_t u8)
257	{
258	# if RT_INLINE_ASM_GNU_STYLE
259	__asm__ __volatile__("xchgb %0, %1\n\t"
260	: "=m" (*pu8),
261	"=q" (u8) /* =r - busted on g++ (GCC) 3.4.4 20050721 (Red Hat 3.4.4-2) */
262	: "1" (u8),
263	"m" (*pu8));
264	# else
265	__asm
266	{
267	# ifdef RT_ARCH_AMD64
268	mov rdx, [pu8]
269	mov al, [u8]
270	xchg [rdx], al
271	mov [u8], al
272	# else
273	mov edx, [pu8]
274	mov al, [u8]
275	xchg [edx], al
276	mov [u8], al
277	# endif
278	}
279	# endif
280	return u8;
281	}
282	#endif
283
284
285	/**
286	* Atomically Exchange a signed 8-bit value, ordered.
287	*
288	* @returns Current *pu8 value
289	* @param pi8 Pointer to the 8-bit variable to update.
290	* @param i8 The 8-bit value to assign to *pi8.
291	*/
292	DECLINLINE(int8_t) ASMAtomicXchgS8(volatile int8_t *pi8, int8_t i8)
293	{
294	return (int8_t)ASMAtomicXchgU8((volatile uint8_t *)pi8, (uint8_t)i8);
295	}
296
297
298	/**
299	* Atomically Exchange a bool value, ordered.
300	*
301	* @returns Current *pf value
302	* @param pf Pointer to the 8-bit variable to update.
303	* @param f The 8-bit value to assign to *pi8.
304	*/
305	DECLINLINE(bool) ASMAtomicXchgBool(volatile bool *pf, bool f)
306	{
307	#ifdef _MSC_VER
308	return !!ASMAtomicXchgU8((volatile uint8_t *)pf, (uint8_t)f);
309	#else
310	return (bool)ASMAtomicXchgU8((volatile uint8_t *)pf, (uint8_t)f);
311	#endif
312	}
313
314
315	/**
316	* Atomically Exchange an unsigned 16-bit value, ordered.
317	*
318	* @returns Current *pu16 value
319	* @param pu16 Pointer to the 16-bit variable to update.
320	* @param u16 The 16-bit value to assign to *pu16.
321	*/
322	#if RT_INLINE_ASM_EXTERNAL
323	DECLASM(uint16_t) ASMAtomicXchgU16(volatile uint16_t *pu16, uint16_t u16);
324	#else
325	DECLINLINE(uint16_t) ASMAtomicXchgU16(volatile uint16_t *pu16, uint16_t u16)
326	{
327	# if RT_INLINE_ASM_GNU_STYLE
328	__asm__ __volatile__("xchgw %0, %1\n\t"
329	: "=m" (*pu16),
330	"=r" (u16)
331	: "1" (u16),
332	"m" (*pu16));
333	# else
334	__asm
335	{
336	# ifdef RT_ARCH_AMD64
337	mov rdx, [pu16]
338	mov ax, [u16]
339	xchg [rdx], ax
340	mov [u16], ax
341	# else
342	mov edx, [pu16]
343	mov ax, [u16]
344	xchg [edx], ax
345	mov [u16], ax
346	# endif
347	}
348	# endif
349	return u16;
350	}
351	#endif
352
353
354	/**
355	* Atomically Exchange a signed 16-bit value, ordered.
356	*
357	* @returns Current *pu16 value
358	* @param pi16 Pointer to the 16-bit variable to update.
359	* @param i16 The 16-bit value to assign to *pi16.
360	*/
361	DECLINLINE(int16_t) ASMAtomicXchgS16(volatile int16_t *pi16, int16_t i16)
362	{
363	return (int16_t)ASMAtomicXchgU16((volatile uint16_t *)pi16, (uint16_t)i16);
364	}
365
366
367	/**
368	* Atomically Exchange an unsigned 32-bit value, ordered.
369	*
370	* @returns Current *pu32 value
371	* @param pu32 Pointer to the 32-bit variable to update.
372	* @param u32 The 32-bit value to assign to *pu32.
373	*
374	* @remarks Does not work on 286 and earlier.
375	*/
376	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
377	DECLASM(uint32_t) ASMAtomicXchgU32(volatile uint32_t *pu32, uint32_t u32);
378	#else
379	DECLINLINE(uint32_t) ASMAtomicXchgU32(volatile uint32_t *pu32, uint32_t u32)
380	{
381	# if RT_INLINE_ASM_GNU_STYLE
382	__asm__ __volatile__("xchgl %0, %1\n\t"
383	: "=m" (*pu32),
384	"=r" (u32)
385	: "1" (u32),
386	"m" (*pu32));
387
388	# elif RT_INLINE_ASM_USES_INTRIN
389	u32 = _InterlockedExchange((long *)pu32, u32);
390
391	# else
392	__asm
393	{
394	# ifdef RT_ARCH_AMD64
395	mov rdx, [pu32]
396	mov eax, u32
397	xchg [rdx], eax
398	mov [u32], eax
399	# else
400	mov edx, [pu32]
401	mov eax, u32
402	xchg [edx], eax
403	mov [u32], eax
404	# endif
405	}
406	# endif
407	return u32;
408	}
409	#endif
410
411
412	/**
413	* Atomically Exchange a signed 32-bit value, ordered.
414	*
415	* @returns Current *pu32 value
416	* @param pi32 Pointer to the 32-bit variable to update.
417	* @param i32 The 32-bit value to assign to *pi32.
418	*/
419	DECLINLINE(int32_t) ASMAtomicXchgS32(volatile int32_t *pi32, int32_t i32)
420	{
421	return (int32_t)ASMAtomicXchgU32((volatile uint32_t *)pi32, (uint32_t)i32);
422	}
423
424
425	/**
426	* Atomically Exchange an unsigned 64-bit value, ordered.
427	*
428	* @returns Current *pu64 value
429	* @param pu64 Pointer to the 64-bit variable to update.
430	* @param u64 The 64-bit value to assign to *pu64.
431	*
432	* @remarks Works on 32-bit x86 CPUs starting with Pentium.
433	*/
434	#if (RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN) \
435	\|\| RT_INLINE_DONT_MIX_CMPXCHG8B_AND_PIC
436	DECLASM(uint64_t) ASMAtomicXchgU64(volatile uint64_t *pu64, uint64_t u64);
437	#else
438	DECLINLINE(uint64_t) ASMAtomicXchgU64(volatile uint64_t *pu64, uint64_t u64)
439	{
440	# if defined(RT_ARCH_AMD64)
441	# if RT_INLINE_ASM_USES_INTRIN
442	u64 = _InterlockedExchange64((__int64 *)pu64, u64);
443
444	# elif RT_INLINE_ASM_GNU_STYLE
445	__asm__ __volatile__("xchgq %0, %1\n\t"
446	: "=m" (*pu64),
447	"=r" (u64)
448	: "1" (u64),
449	"m" (*pu64));
450	# else
451	__asm
452	{
453	mov rdx, [pu64]
454	mov rax, [u64]
455	xchg [rdx], rax
456	mov [u64], rax
457	}
458	# endif
459	# else /* !RT_ARCH_AMD64 */
460	# if RT_INLINE_ASM_GNU_STYLE
461	# if defined(PIC) \|\| defined(__PIC__)
462	uint32_t u32EBX = (uint32_t)u64;
463	__asm__ __volatile__(/"xchgl %%esi, %5\n\t"/
464	"xchgl %%ebx, %3\n\t"
465	"1:\n\t"
466	"lock; cmpxchg8b (%5)\n\t"
467	"jnz 1b\n\t"
468	"movl %3, %%ebx\n\t"
469	/"xchgl %%esi, %5\n\t"/
470	: "=A" (u64),
471	"=m" (*pu64)
472	: "0" (*pu64),
473	"m" ( u32EBX ),
474	"c" ( (uint32_t)(u64 >> 32) ),
475	"S" (pu64));
476	# else /* !PIC */
477	__asm__ __volatile__("1:\n\t"
478	"lock; cmpxchg8b %1\n\t"
479	"jnz 1b\n\t"
480	: "=A" (u64),
481	"=m" (*pu64)
482	: "0" (*pu64),
483	"b" ( (uint32_t)u64 ),
484	"c" ( (uint32_t)(u64 >> 32) ));
485	# endif
486	# else
487	__asm
488	{
489	mov ebx, dword ptr [u64]
490	mov ecx, dword ptr [u64 + 4]
491	mov edi, pu64
492	mov eax, dword ptr [edi]
493	mov edx, dword ptr [edi + 4]
494	retry:
495	lock cmpxchg8b [edi]
496	jnz retry
497	mov dword ptr [u64], eax
498	mov dword ptr [u64 + 4], edx
499	}
500	# endif
501	# endif /* !RT_ARCH_AMD64 */
502	return u64;
503	}
504	#endif
505
506
507	/**
508	* Atomically Exchange an signed 64-bit value, ordered.
509	*
510	* @returns Current *pi64 value
511	* @param pi64 Pointer to the 64-bit variable to update.
512	* @param i64 The 64-bit value to assign to *pi64.
513	*/
514	DECLINLINE(int64_t) ASMAtomicXchgS64(volatile int64_t *pi64, int64_t i64)
515	{
516	return (int64_t)ASMAtomicXchgU64((volatile uint64_t *)pi64, (uint64_t)i64);
517	}
518
519
520	/**
521	* Atomically Exchange a pointer value, ordered.
522	*
523	* @returns Current *ppv value
524	* @param ppv Pointer to the pointer variable to update.
525	* @param pv The pointer value to assign to *ppv.
526	*/
527	DECLINLINE(void ) ASMAtomicXchgPtr(void volatile ppv, const void pv)
528	{
529	#if ARCH_BITS == 32 \|\| (ARCH_BITS == 16 && RT_FAR_DATA)
530	return (void )ASMAtomicXchgU32((volatile uint32_t )(void *)ppv, (uint32_t)pv);
531	#elif ARCH_BITS == 64
532	return (void )ASMAtomicXchgU64((volatile uint64_t )(void *)ppv, (uint64_t)pv);
533	#else
534	# error "ARCH_BITS is bogus"
535	#endif
536	}
537
538
539	/**
540	* Convenience macro for avoiding the annoying casting with ASMAtomicXchgPtr.
541	*
542	* @returns Current *pv value
543	* @param ppv Pointer to the pointer variable to update.
544	* @param pv The pointer value to assign to *ppv.
545	* @param Type The type of *ppv, sans volatile.
546	*/
547	#ifdef __GNUC__
548	# define ASMAtomicXchgPtrT(ppv, pv, Type) \
549	__extension__ \
550	({\
551	__typeof__((ppv)) volatile const ppvTypeChecked = (ppv); \
552	Type const pvTypeChecked = (pv); \
553	Type pvTypeCheckedRet = (__typeof__((ppv))) ASMAtomicXchgPtr((void volatile )ppvTypeChecked, (void )pvTypeChecked); \
554	pvTypeCheckedRet; \
555	})
556	#else
557	# define ASMAtomicXchgPtrT(ppv, pv, Type) \
558	(Type)ASMAtomicXchgPtr((void * volatile )(ppv), (void )(pv))
559	#endif
560
561
562	/**
563	* Atomically Exchange a raw-mode context pointer value, ordered.
564	*
565	* @returns Current *ppv value
566	* @param ppvRC Pointer to the pointer variable to update.
567	* @param pvRC The pointer value to assign to *ppv.
568	*/
569	DECLINLINE(RTRCPTR) ASMAtomicXchgRCPtr(RTRCPTR volatile *ppvRC, RTRCPTR pvRC)
570	{
571	return (RTRCPTR)ASMAtomicXchgU32((uint32_t volatile )(void )ppvRC, (uint32_t)pvRC);
572	}
573
574
575	/**
576	* Atomically Exchange a ring-0 pointer value, ordered.
577	*
578	* @returns Current *ppv value
579	* @param ppvR0 Pointer to the pointer variable to update.
580	* @param pvR0 The pointer value to assign to *ppv.
581	*/
582	DECLINLINE(RTR0PTR) ASMAtomicXchgR0Ptr(RTR0PTR volatile *ppvR0, RTR0PTR pvR0)
583	{
584	#if R0_ARCH_BITS == 32 \|\| (ARCH_BITS == 16 && RT_FAR_DATA)
585	return (RTR0PTR)ASMAtomicXchgU32((volatile uint32_t )(void )ppvR0, (uint32_t)pvR0);
586	#elif R0_ARCH_BITS == 64
587	return (RTR0PTR)ASMAtomicXchgU64((volatile uint64_t )(void )ppvR0, (uint64_t)pvR0);
588	#else
589	# error "R0_ARCH_BITS is bogus"
590	#endif
591	}
592
593
594	/**
595	* Atomically Exchange a ring-3 pointer value, ordered.
596	*
597	* @returns Current *ppv value
598	* @param ppvR3 Pointer to the pointer variable to update.
599	* @param pvR3 The pointer value to assign to *ppv.
600	*/
601	DECLINLINE(RTR3PTR) ASMAtomicXchgR3Ptr(RTR3PTR volatile *ppvR3, RTR3PTR pvR3)
602	{
603	#if R3_ARCH_BITS == 32 \|\| (ARCH_BITS == 16 && RT_FAR_DATA)
604	return (RTR3PTR)ASMAtomicXchgU32((volatile uint32_t )(void )ppvR3, (uint32_t)pvR3);
605	#elif R3_ARCH_BITS == 64
606	return (RTR3PTR)ASMAtomicXchgU64((volatile uint64_t )(void )ppvR3, (uint64_t)pvR3);
607	#else
608	# error "R3_ARCH_BITS is bogus"
609	#endif
610	}
611
612
613	/** @def ASMAtomicXchgHandle
614	* Atomically Exchange a typical IPRT handle value, ordered.
615	*
616	* @param ph Pointer to the value to update.
617	* @param hNew The new value to assigned to *pu.
618	* @param phRes Where to store the current *ph value.
619	*
620	* @remarks This doesn't currently work for all handles (like RTFILE).
621	*/
622	#if HC_ARCH_BITS == 32 \|\| (ARCH_BITS == 16 && RT_FAR_DATA)
623	# define ASMAtomicXchgHandle(ph, hNew, phRes) \
624	do { \
625	AssertCompile(sizeof(*(ph)) == sizeof(uint32_t)); \
626	AssertCompile(sizeof(*(phRes)) == sizeof(uint32_t)); \
627	(uint32_t )(phRes) = ASMAtomicXchgU32((uint32_t volatile *)(ph), (const uint32_t)(hNew)); \
628	} while (0)
629	#elif HC_ARCH_BITS == 64
630	# define ASMAtomicXchgHandle(ph, hNew, phRes) \
631	do { \
632	AssertCompile(sizeof(*(ph)) == sizeof(uint64_t)); \
633	AssertCompile(sizeof(*(phRes)) == sizeof(uint64_t)); \
634	(uint64_t )(phRes) = ASMAtomicXchgU64((uint64_t volatile *)(ph), (const uint64_t)(hNew)); \
635	} while (0)
636	#else
637	# error HC_ARCH_BITS
638	#endif
639
640
641	/**
642	* Atomically Exchange a value which size might differ
643	* between platforms or compilers, ordered.
644	*
645	* @param pu Pointer to the variable to update.
646	* @param uNew The value to assign to *pu.
647	* @todo This is busted as its missing the result argument.
648	*/
649	#define ASMAtomicXchgSize(pu, uNew) \
650	do { \
651	switch (sizeof(*(pu))) { \
652	case 1: ASMAtomicXchgU8((volatile uint8_t )(void )(pu), (uint8_t)(uNew)); break; \
653	case 2: ASMAtomicXchgU16((volatile uint16_t )(void )(pu), (uint16_t)(uNew)); break; \
654	case 4: ASMAtomicXchgU32((volatile uint32_t )(void )(pu), (uint32_t)(uNew)); break; \
655	case 8: ASMAtomicXchgU64((volatile uint64_t )(void )(pu), (uint64_t)(uNew)); break; \
656	default: AssertMsgFailed(("ASMAtomicXchgSize: size %d is not supported\n", sizeof(*(pu)))); \
657	} \
658	} while (0)
659
660	/**
661	* Atomically Exchange a value which size might differ
662	* between platforms or compilers, ordered.
663	*
664	* @param pu Pointer to the variable to update.
665	* @param uNew The value to assign to *pu.
666	* @param puRes Where to store the current *pu value.
667	*/
668	#define ASMAtomicXchgSizeCorrect(pu, uNew, puRes) \
669	do { \
670	switch (sizeof(*(pu))) { \
671	case 1: (uint8_t )(puRes) = ASMAtomicXchgU8((volatile uint8_t )(void )(pu), (uint8_t)(uNew)); break; \
672	case 2: (uint16_t )(puRes) = ASMAtomicXchgU16((volatile uint16_t )(void )(pu), (uint16_t)(uNew)); break; \
673	case 4: (uint32_t )(puRes) = ASMAtomicXchgU32((volatile uint32_t )(void )(pu), (uint32_t)(uNew)); break; \
674	case 8: (uint64_t )(puRes) = ASMAtomicXchgU64((volatile uint64_t )(void )(pu), (uint64_t)(uNew)); break; \
675	default: AssertMsgFailed(("ASMAtomicXchgSize: size %d is not supported\n", sizeof(*(pu)))); \
676	} \
677	} while (0)
678
679
680
681	/**
682	* Atomically Compare and Exchange an unsigned 8-bit value, ordered.
683	*
684	* @returns true if xchg was done.
685	* @returns false if xchg wasn't done.
686	*
687	* @param pu8 Pointer to the value to update.
688	* @param u8New The new value to assigned to *pu8.
689	* @param u8Old The old value to *pu8 compare with.
690	*
691	* @remarks x86: Requires a 486 or later.
692	*/
693	#if RT_INLINE_ASM_EXTERNAL \|\| !RT_INLINE_ASM_GNU_STYLE
694	DECLASM(bool) ASMAtomicCmpXchgU8(volatile uint8_t *pu8, const uint8_t u8New, const uint8_t u8Old);
695	#else
696	DECLINLINE(bool) ASMAtomicCmpXchgU8(volatile uint8_t *pu8, const uint8_t u8New, uint8_t u8Old)
697	{
698	uint8_t u8Ret;
699	__asm__ __volatile__("lock; cmpxchgb %3, %0\n\t"
700	"setz %1\n\t"
701	: "=m" (*pu8),
702	"=qm" (u8Ret),
703	"=a" (u8Old)
704	: "q" (u8New),
705	"2" (u8Old),
706	"m" (*pu8));
707	return (bool)u8Ret;
708	}
709	#endif
710
711
712	/**
713	* Atomically Compare and Exchange a signed 8-bit value, ordered.
714	*
715	* @returns true if xchg was done.
716	* @returns false if xchg wasn't done.
717	*
718	* @param pi8 Pointer to the value to update.
719	* @param i8New The new value to assigned to *pi8.
720	* @param i8Old The old value to *pi8 compare with.
721	*
722	* @remarks x86: Requires a 486 or later.
723	*/
724	DECLINLINE(bool) ASMAtomicCmpXchgS8(volatile int8_t *pi8, const int8_t i8New, const int8_t i8Old)
725	{
726	return ASMAtomicCmpXchgU8((volatile uint8_t *)pi8, (const uint8_t)i8New, (const uint8_t)i8Old);
727	}
728
729
730	/**
731	* Atomically Compare and Exchange a bool value, ordered.
732	*
733	* @returns true if xchg was done.
734	* @returns false if xchg wasn't done.
735	*
736	* @param pf Pointer to the value to update.
737	* @param fNew The new value to assigned to *pf.
738	* @param fOld The old value to *pf compare with.
739	*
740	* @remarks x86: Requires a 486 or later.
741	*/
742	DECLINLINE(bool) ASMAtomicCmpXchgBool(volatile bool *pf, const bool fNew, const bool fOld)
743	{
744	return ASMAtomicCmpXchgU8((volatile uint8_t *)pf, (const uint8_t)fNew, (const uint8_t)fOld);
745	}
746
747
748	/**
749	* Atomically Compare and Exchange an unsigned 32-bit value, ordered.
750	*
751	* @returns true if xchg was done.
752	* @returns false if xchg wasn't done.
753	*
754	* @param pu32 Pointer to the value to update.
755	* @param u32New The new value to assigned to *pu32.
756	* @param u32Old The old value to *pu32 compare with.
757	*
758	* @remarks x86: Requires a 486 or later.
759	*/
760	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
761	DECLASM(bool) ASMAtomicCmpXchgU32(volatile uint32_t *pu32, const uint32_t u32New, const uint32_t u32Old);
762	#else
763	DECLINLINE(bool) ASMAtomicCmpXchgU32(volatile uint32_t *pu32, const uint32_t u32New, uint32_t u32Old)
764	{
765	# if RT_INLINE_ASM_GNU_STYLE
766	uint8_t u8Ret;
767	__asm__ __volatile__("lock; cmpxchgl %3, %0\n\t"
768	"setz %1\n\t"
769	: "=m" (*pu32),
770	"=qm" (u8Ret),
771	"=a" (u32Old)
772	: "r" (u32New),
773	"2" (u32Old),
774	"m" (*pu32));
775	return (bool)u8Ret;
776
777	# elif RT_INLINE_ASM_USES_INTRIN
778	return (uint32_t)_InterlockedCompareExchange((long *)pu32, u32New, u32Old) == u32Old;
779
780	# else
781	uint32_t u32Ret;
782	__asm
783	{
784	# ifdef RT_ARCH_AMD64
785	mov rdx, [pu32]
786	# else
787	mov edx, [pu32]
788	# endif
789	mov eax, [u32Old]
790	mov ecx, [u32New]
791	# ifdef RT_ARCH_AMD64
792	lock cmpxchg [rdx], ecx
793	# else
794	lock cmpxchg [edx], ecx
795	# endif
796	setz al
797	movzx eax, al
798	mov [u32Ret], eax
799	}
800	return !!u32Ret;
801	# endif
802	}
803	#endif
804
805
806	/**
807	* Atomically Compare and Exchange a signed 32-bit value, ordered.
808	*
809	* @returns true if xchg was done.
810	* @returns false if xchg wasn't done.
811	*
812	* @param pi32 Pointer to the value to update.
813	* @param i32New The new value to assigned to *pi32.
814	* @param i32Old The old value to *pi32 compare with.
815	*
816	* @remarks x86: Requires a 486 or later.
817	*/
818	DECLINLINE(bool) ASMAtomicCmpXchgS32(volatile int32_t *pi32, const int32_t i32New, const int32_t i32Old)
819	{
820	return ASMAtomicCmpXchgU32((volatile uint32_t *)pi32, (uint32_t)i32New, (uint32_t)i32Old);
821	}
822
823
824	/**
825	* Atomically Compare and exchange an unsigned 64-bit value, ordered.
826	*
827	* @returns true if xchg was done.
828	* @returns false if xchg wasn't done.
829	*
830	* @param pu64 Pointer to the 64-bit variable to update.
831	* @param u64New The 64-bit value to assign to *pu64.
832	* @param u64Old The value to compare with.
833	*
834	* @remarks x86: Requires a Pentium or later.
835	*/
836	#if (RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN) \
837	\|\| RT_INLINE_DONT_MIX_CMPXCHG8B_AND_PIC
838	DECLASM(bool) ASMAtomicCmpXchgU64(volatile uint64_t *pu64, const uint64_t u64New, const uint64_t u64Old);
839	#else
840	DECLINLINE(bool) ASMAtomicCmpXchgU64(volatile uint64_t *pu64, uint64_t u64New, uint64_t u64Old)
841	{
842	# if RT_INLINE_ASM_USES_INTRIN
843	return (uint64_t)_InterlockedCompareExchange64((__int64 *)pu64, u64New, u64Old) == u64Old;
844
845	# elif defined(RT_ARCH_AMD64)
846	# if RT_INLINE_ASM_GNU_STYLE
847	uint8_t u8Ret;
848	__asm__ __volatile__("lock; cmpxchgq %3, %0\n\t"
849	"setz %1\n\t"
850	: "=m" (*pu64),
851	"=qm" (u8Ret),
852	"=a" (u64Old)
853	: "r" (u64New),
854	"2" (u64Old),
855	"m" (*pu64));
856	return (bool)u8Ret;
857	# else
858	bool fRet;
859	__asm
860	{
861	mov rdx, [pu32]
862	mov rax, [u64Old]
863	mov rcx, [u64New]
864	lock cmpxchg [rdx], rcx
865	setz al
866	mov [fRet], al
867	}
868	return fRet;
869	# endif
870	# else /* !RT_ARCH_AMD64 */
871	uint32_t u32Ret;
872	# if RT_INLINE_ASM_GNU_STYLE
873	# if defined(PIC) \|\| defined(__PIC__)
874	uint32_t u32EBX = (uint32_t)u64New;
875	uint32_t u32Spill;
876	__asm__ __volatile__("xchgl %%ebx, %4\n\t"
877	"lock; cmpxchg8b (%6)\n\t"
878	"setz %%al\n\t"
879	"movl %4, %%ebx\n\t"
880	"movzbl %%al, %%eax\n\t"
881	: "=a" (u32Ret),
882	"=d" (u32Spill),
883	# if RT_GNUC_PREREQ(4, 3)
884	"+m" (*pu64)
885	# else
886	"=m" (*pu64)
887	# endif
888	: "A" (u64Old),
889	"m" ( u32EBX ),
890	"c" ( (uint32_t)(u64New >> 32) ),
891	"S" (pu64));
892	# else /* !PIC */
893	uint32_t u32Spill;
894	__asm__ __volatile__("lock; cmpxchg8b %2\n\t"
895	"setz %%al\n\t"
896	"movzbl %%al, %%eax\n\t"
897	: "=a" (u32Ret),
898	"=d" (u32Spill),
899	"+m" (*pu64)
900	: "A" (u64Old),
901	"b" ( (uint32_t)u64New ),
902	"c" ( (uint32_t)(u64New >> 32) ));
903	# endif
904	return (bool)u32Ret;
905	# else
906	__asm
907	{
908	mov ebx, dword ptr [u64New]
909	mov ecx, dword ptr [u64New + 4]
910	mov edi, [pu64]
911	mov eax, dword ptr [u64Old]
912	mov edx, dword ptr [u64Old + 4]
913	lock cmpxchg8b [edi]
914	setz al
915	movzx eax, al
916	mov dword ptr [u32Ret], eax
917	}
918	return !!u32Ret;
919	# endif
920	# endif /* !RT_ARCH_AMD64 */
921	}
922	#endif
923
924
925	/**
926	* Atomically Compare and exchange a signed 64-bit value, ordered.
927	*
928	* @returns true if xchg was done.
929	* @returns false if xchg wasn't done.
930	*
931	* @param pi64 Pointer to the 64-bit variable to update.
932	* @param i64 The 64-bit value to assign to *pu64.
933	* @param i64Old The value to compare with.
934	*
935	* @remarks x86: Requires a Pentium or later.
936	*/
937	DECLINLINE(bool) ASMAtomicCmpXchgS64(volatile int64_t *pi64, const int64_t i64, const int64_t i64Old)
938	{
939	return ASMAtomicCmpXchgU64((volatile uint64_t *)pi64, (uint64_t)i64, (uint64_t)i64Old);
940	}
941
942
943	/**
944	* Atomically Compare and Exchange a pointer value, ordered.
945	*
946	* @returns true if xchg was done.
947	* @returns false if xchg wasn't done.
948	*
949	* @param ppv Pointer to the value to update.
950	* @param pvNew The new value to assigned to *ppv.
951	* @param pvOld The old value to *ppv compare with.
952	*
953	* @remarks x86: Requires a 486 or later.
954	*/
955	DECLINLINE(bool) ASMAtomicCmpXchgPtrVoid(void * volatile ppv, const void pvNew, const void *pvOld)
956	{
957	#if ARCH_BITS == 32 \|\| (ARCH_BITS == 16 && RT_FAR_DATA)
958	return ASMAtomicCmpXchgU32((volatile uint32_t )(void )ppv, (uint32_t)pvNew, (uint32_t)pvOld);
959	#elif ARCH_BITS == 64
960	return ASMAtomicCmpXchgU64((volatile uint64_t )(void )ppv, (uint64_t)pvNew, (uint64_t)pvOld);
961	#else
962	# error "ARCH_BITS is bogus"
963	#endif
964	}
965
966
967	/**
968	* Atomically Compare and Exchange a pointer value, ordered.
969	*
970	* @returns true if xchg was done.
971	* @returns false if xchg wasn't done.
972	*
973	* @param ppv Pointer to the value to update.
974	* @param pvNew The new value to assigned to *ppv.
975	* @param pvOld The old value to *ppv compare with.
976	*
977	* @remarks This is relatively type safe on GCC platforms.
978	* @remarks x86: Requires a 486 or later.
979	*/
980	#ifdef __GNUC__
981	# define ASMAtomicCmpXchgPtr(ppv, pvNew, pvOld) \
982	__extension__ \
983	({\
984	__typeof__((ppv)) volatile const ppvTypeChecked = (ppv); \
985	__typeof__(*(ppv)) const pvNewTypeChecked = (pvNew); \
986	__typeof__(*(ppv)) const pvOldTypeChecked = (pvOld); \
987	bool fMacroRet = ASMAtomicCmpXchgPtrVoid((void * volatile *)ppvTypeChecked, \
988	(void )pvNewTypeChecked, (void )pvOldTypeChecked); \
989	fMacroRet; \
990	})
991	#else
992	# define ASMAtomicCmpXchgPtr(ppv, pvNew, pvOld) \
993	ASMAtomicCmpXchgPtrVoid((void * volatile )(ppv), (void )(pvNew), (void *)(pvOld))
994	#endif
995
996
997	/** @def ASMAtomicCmpXchgHandle
998	* Atomically Compare and Exchange a typical IPRT handle value, ordered.
999	*
1000	* @param ph Pointer to the value to update.
1001	* @param hNew The new value to assigned to *pu.
1002	* @param hOld The old value to *pu compare with.
1003	* @param fRc Where to store the result.
1004	*
1005	* @remarks This doesn't currently work for all handles (like RTFILE).
1006	* @remarks x86: Requires a 486 or later.
1007	*/
1008	#if HC_ARCH_BITS == 32 \|\| (ARCH_BITS == 16 && RT_FAR_DATA)
1009	# define ASMAtomicCmpXchgHandle(ph, hNew, hOld, fRc) \
1010	do { \
1011	AssertCompile(sizeof(*(ph)) == sizeof(uint32_t)); \
1012	(fRc) = ASMAtomicCmpXchgU32((uint32_t volatile *)(ph), (const uint32_t)(hNew), (const uint32_t)(hOld)); \
1013	} while (0)
1014	#elif HC_ARCH_BITS == 64
1015	# define ASMAtomicCmpXchgHandle(ph, hNew, hOld, fRc) \
1016	do { \
1017	AssertCompile(sizeof(*(ph)) == sizeof(uint64_t)); \
1018	(fRc) = ASMAtomicCmpXchgU64((uint64_t volatile *)(ph), (const uint64_t)(hNew), (const uint64_t)(hOld)); \
1019	} while (0)
1020	#else
1021	# error HC_ARCH_BITS
1022	#endif
1023
1024
1025	/** @def ASMAtomicCmpXchgSize
1026	* Atomically Compare and Exchange a value which size might differ
1027	* between platforms or compilers, ordered.
1028	*
1029	* @param pu Pointer to the value to update.
1030	* @param uNew The new value to assigned to *pu.
1031	* @param uOld The old value to *pu compare with.
1032	* @param fRc Where to store the result.
1033	*
1034	* @remarks x86: Requires a 486 or later.
1035	*/
1036	#define ASMAtomicCmpXchgSize(pu, uNew, uOld, fRc) \
1037	do { \
1038	switch (sizeof(*(pu))) { \
1039	case 4: (fRc) = ASMAtomicCmpXchgU32((volatile uint32_t )(void )(pu), (uint32_t)(uNew), (uint32_t)(uOld)); \
1040	break; \
1041	case 8: (fRc) = ASMAtomicCmpXchgU64((volatile uint64_t )(void )(pu), (uint64_t)(uNew), (uint64_t)(uOld)); \
1042	break; \
1043	default: AssertMsgFailed(("ASMAtomicCmpXchgSize: size %d is not supported\n", sizeof(*(pu)))); \
1044	(fRc) = false; \
1045	break; \
1046	} \
1047	} while (0)
1048
1049
1050	/**
1051	* Atomically Compare and Exchange an unsigned 32-bit value, additionally
1052	* passes back old value, ordered.
1053	*
1054	* @returns true if xchg was done.
1055	* @returns false if xchg wasn't done.
1056	*
1057	* @param pu32 Pointer to the value to update.
1058	* @param u32New The new value to assigned to *pu32.
1059	* @param u32Old The old value to *pu32 compare with.
1060	* @param pu32Old Pointer store the old value at.
1061	*
1062	* @remarks x86: Requires a 486 or later.
1063	*/
1064	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
1065	DECLASM(bool) ASMAtomicCmpXchgExU32(volatile uint32_t pu32, const uint32_t u32New, const uint32_t u32Old, uint32_t pu32Old);
1066	#else
1067	DECLINLINE(bool) ASMAtomicCmpXchgExU32(volatile uint32_t pu32, const uint32_t u32New, const uint32_t u32Old, uint32_t pu32Old)
1068	{
1069	# if RT_INLINE_ASM_GNU_STYLE
1070	uint8_t u8Ret;
1071	__asm__ __volatile__("lock; cmpxchgl %3, %0\n\t"
1072	"setz %1\n\t"
1073	: "=m" (*pu32),
1074	"=qm" (u8Ret),
1075	"=a" (*pu32Old)
1076	: "r" (u32New),
1077	"a" (u32Old),
1078	"m" (*pu32));
1079	return (bool)u8Ret;
1080
1081	# elif RT_INLINE_ASM_USES_INTRIN
1082	return (pu32Old =_InterlockedCompareExchange((long )pu32, u32New, u32Old)) == u32Old;
1083
1084	# else
1085	uint32_t u32Ret;
1086	__asm
1087	{
1088	# ifdef RT_ARCH_AMD64
1089	mov rdx, [pu32]
1090	# else
1091	mov edx, [pu32]
1092	# endif
1093	mov eax, [u32Old]
1094	mov ecx, [u32New]
1095	# ifdef RT_ARCH_AMD64
1096	lock cmpxchg [rdx], ecx
1097	mov rdx, [pu32Old]
1098	mov [rdx], eax
1099	# else
1100	lock cmpxchg [edx], ecx
1101	mov edx, [pu32Old]
1102	mov [edx], eax
1103	# endif
1104	setz al
1105	movzx eax, al
1106	mov [u32Ret], eax
1107	}
1108	return !!u32Ret;
1109	# endif
1110	}
1111	#endif
1112
1113
1114	/**
1115	* Atomically Compare and Exchange a signed 32-bit value, additionally
1116	* passes back old value, ordered.
1117	*
1118	* @returns true if xchg was done.
1119	* @returns false if xchg wasn't done.
1120	*
1121	* @param pi32 Pointer to the value to update.
1122	* @param i32New The new value to assigned to *pi32.
1123	* @param i32Old The old value to *pi32 compare with.
1124	* @param pi32Old Pointer store the old value at.
1125	*
1126	* @remarks x86: Requires a 486 or later.
1127	*/
1128	DECLINLINE(bool) ASMAtomicCmpXchgExS32(volatile int32_t pi32, const int32_t i32New, const int32_t i32Old, int32_t pi32Old)
1129	{
1130	return ASMAtomicCmpXchgExU32((volatile uint32_t )pi32, (uint32_t)i32New, (uint32_t)i32Old, (uint32_t )pi32Old);
1131	}
1132
1133
1134	/**
1135	* Atomically Compare and exchange an unsigned 64-bit value, additionally
1136	* passing back old value, ordered.
1137	*
1138	* @returns true if xchg was done.
1139	* @returns false if xchg wasn't done.
1140	*
1141	* @param pu64 Pointer to the 64-bit variable to update.
1142	* @param u64New The 64-bit value to assign to *pu64.
1143	* @param u64Old The value to compare with.
1144	* @param pu64Old Pointer store the old value at.
1145	*
1146	* @remarks x86: Requires a Pentium or later.
1147	*/
1148	#if (RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN) \
1149	\|\| RT_INLINE_DONT_MIX_CMPXCHG8B_AND_PIC
1150	DECLASM(bool) ASMAtomicCmpXchgExU64(volatile uint64_t pu64, const uint64_t u64New, const uint64_t u64Old, uint64_t pu64Old);
1151	#else
1152	DECLINLINE(bool) ASMAtomicCmpXchgExU64(volatile uint64_t pu64, const uint64_t u64New, const uint64_t u64Old, uint64_t pu64Old)
1153	{
1154	# if RT_INLINE_ASM_USES_INTRIN
1155	return (pu64Old =_InterlockedCompareExchange64((__int64 )pu64, u64New, u64Old)) == u64Old;
1156
1157	# elif defined(RT_ARCH_AMD64)
1158	# if RT_INLINE_ASM_GNU_STYLE
1159	uint8_t u8Ret;
1160	__asm__ __volatile__("lock; cmpxchgq %3, %0\n\t"
1161	"setz %1\n\t"
1162	: "=m" (*pu64),
1163	"=qm" (u8Ret),
1164	"=a" (*pu64Old)
1165	: "r" (u64New),
1166	"a" (u64Old),
1167	"m" (*pu64));
1168	return (bool)u8Ret;
1169	# else
1170	bool fRet;
1171	__asm
1172	{
1173	mov rdx, [pu32]
1174	mov rax, [u64Old]
1175	mov rcx, [u64New]
1176	lock cmpxchg [rdx], rcx
1177	mov rdx, [pu64Old]
1178	mov [rdx], rax
1179	setz al
1180	mov [fRet], al
1181	}
1182	return fRet;
1183	# endif
1184	# else /* !RT_ARCH_AMD64 */
1185	# if RT_INLINE_ASM_GNU_STYLE
1186	uint64_t u64Ret;
1187	# if defined(PIC) \|\| defined(__PIC__)
1188	/* NB: this code uses a memory clobber description, because the clean
1189	* solution with an output value for *pu64 makes gcc run out of registers.
1190	* This will cause suboptimal code, and anyone with a better solution is
1191	* welcome to improve this. */
1192	__asm__ __volatile__("xchgl %%ebx, %1\n\t"
1193	"lock; cmpxchg8b %3\n\t"
1194	"xchgl %%ebx, %1\n\t"
1195	: "=A" (u64Ret)
1196	: "DS" ((uint32_t)u64New),
1197	"c" ((uint32_t)(u64New >> 32)),
1198	"m" (*pu64),
1199	"0" (u64Old)
1200	: "memory" );
1201	# else /* !PIC */
1202	__asm__ __volatile__("lock; cmpxchg8b %4\n\t"
1203	: "=A" (u64Ret),
1204	"=m" (*pu64)
1205	: "b" ((uint32_t)u64New),
1206	"c" ((uint32_t)(u64New >> 32)),
1207	"m" (*pu64),
1208	"0" (u64Old));
1209	# endif
1210	*pu64Old = u64Ret;
1211	return u64Ret == u64Old;
1212	# else
1213	uint32_t u32Ret;
1214	__asm
1215	{
1216	mov ebx, dword ptr [u64New]
1217	mov ecx, dword ptr [u64New + 4]
1218	mov edi, [pu64]
1219	mov eax, dword ptr [u64Old]
1220	mov edx, dword ptr [u64Old + 4]
1221	lock cmpxchg8b [edi]
1222	mov ebx, [pu64Old]
1223	mov [ebx], eax
1224	setz al
1225	movzx eax, al
1226	add ebx, 4
1227	mov [ebx], edx
1228	mov dword ptr [u32Ret], eax
1229	}
1230	return !!u32Ret;
1231	# endif
1232	# endif /* !RT_ARCH_AMD64 */
1233	}
1234	#endif
1235
1236
1237	/**
1238	* Atomically Compare and exchange a signed 64-bit value, additionally
1239	* passing back old value, ordered.
1240	*
1241	* @returns true if xchg was done.
1242	* @returns false if xchg wasn't done.
1243	*
1244	* @param pi64 Pointer to the 64-bit variable to update.
1245	* @param i64 The 64-bit value to assign to *pu64.
1246	* @param i64Old The value to compare with.
1247	* @param pi64Old Pointer store the old value at.
1248	*
1249	* @remarks x86: Requires a Pentium or later.
1250	*/
1251	DECLINLINE(bool) ASMAtomicCmpXchgExS64(volatile int64_t pi64, const int64_t i64, const int64_t i64Old, int64_t pi64Old)
1252	{
1253	return ASMAtomicCmpXchgExU64((volatile uint64_t )pi64, (uint64_t)i64, (uint64_t)i64Old, (uint64_t )pi64Old);
1254	}
1255
1256	/** @def ASMAtomicCmpXchgExHandle
1257	* Atomically Compare and Exchange a typical IPRT handle value, ordered.
1258	*
1259	* @param ph Pointer to the value to update.
1260	* @param hNew The new value to assigned to *pu.
1261	* @param hOld The old value to *pu compare with.
1262	* @param fRc Where to store the result.
1263	* @param phOldVal Pointer to where to store the old value.
1264	*
1265	* @remarks This doesn't currently work for all handles (like RTFILE).
1266	*/
1267	#if HC_ARCH_BITS == 32 \|\| (ARCH_BITS == 16 && RT_FAR_DATA)
1268	# define ASMAtomicCmpXchgExHandle(ph, hNew, hOld, fRc, phOldVal) \
1269	do { \
1270	AssertCompile(sizeof(*ph) == sizeof(uint32_t)); \
1271	AssertCompile(sizeof(*phOldVal) == sizeof(uint32_t)); \
1272	(fRc) = ASMAtomicCmpXchgExU32((volatile uint32_t )(pu), (uint32_t)(uNew), (uint32_t)(uOld), (uint32_t )(puOldVal)); \
1273	} while (0)
1274	#elif HC_ARCH_BITS == 64
1275	# define ASMAtomicCmpXchgExHandle(ph, hNew, hOld, fRc, phOldVal) \
1276	do { \
1277	AssertCompile(sizeof(*(ph)) == sizeof(uint64_t)); \
1278	AssertCompile(sizeof(*(phOldVal)) == sizeof(uint64_t)); \
1279	(fRc) = ASMAtomicCmpXchgExU64((volatile uint64_t )(pu), (uint64_t)(uNew), (uint64_t)(uOld), (uint64_t )(puOldVal)); \
1280	} while (0)
1281	#else
1282	# error HC_ARCH_BITS
1283	#endif
1284
1285
1286	/** @def ASMAtomicCmpXchgExSize
1287	* Atomically Compare and Exchange a value which size might differ
1288	* between platforms or compilers. Additionally passes back old value.
1289	*
1290	* @param pu Pointer to the value to update.
1291	* @param uNew The new value to assigned to *pu.
1292	* @param uOld The old value to *pu compare with.
1293	* @param fRc Where to store the result.
1294	* @param puOldVal Pointer to where to store the old value.
1295	*
1296	* @remarks x86: Requires a 486 or later.
1297	*/
1298	#define ASMAtomicCmpXchgExSize(pu, uNew, uOld, fRc, puOldVal) \
1299	do { \
1300	switch (sizeof(*(pu))) { \
1301	case 4: (fRc) = ASMAtomicCmpXchgExU32((volatile uint32_t )(void )(pu), (uint32_t)(uNew), (uint32_t)(uOld), (uint32_t *)(uOldVal)); \
1302	break; \
1303	case 8: (fRc) = ASMAtomicCmpXchgExU64((volatile uint64_t )(void )(pu), (uint64_t)(uNew), (uint64_t)(uOld), (uint64_t *)(uOldVal)); \
1304	break; \
1305	default: AssertMsgFailed(("ASMAtomicCmpXchgSize: size %d is not supported\n", sizeof(*(pu)))); \
1306	(fRc) = false; \
1307	(uOldVal) = 0; \
1308	break; \
1309	} \
1310	} while (0)
1311
1312
1313	/**
1314	* Atomically Compare and Exchange a pointer value, additionally
1315	* passing back old value, ordered.
1316	*
1317	* @returns true if xchg was done.
1318	* @returns false if xchg wasn't done.
1319	*
1320	* @param ppv Pointer to the value to update.
1321	* @param pvNew The new value to assigned to *ppv.
1322	* @param pvOld The old value to *ppv compare with.
1323	* @param ppvOld Pointer store the old value at.
1324	*
1325	* @remarks x86: Requires a 486 or later.
1326	*/
1327	DECLINLINE(bool) ASMAtomicCmpXchgExPtrVoid(void * volatile ppv, const void pvNew, const void pvOld, void *ppvOld)
1328	{
1329	#if ARCH_BITS == 32 \|\| (ARCH_BITS == 16 && RT_FAR_DATA)
1330	return ASMAtomicCmpXchgExU32((volatile uint32_t )(void )ppv, (uint32_t)pvNew, (uint32_t)pvOld, (uint32_t *)ppvOld);
1331	#elif ARCH_BITS == 64
1332	return ASMAtomicCmpXchgExU64((volatile uint64_t )(void )ppv, (uint64_t)pvNew, (uint64_t)pvOld, (uint64_t *)ppvOld);
1333	#else
1334	# error "ARCH_BITS is bogus"
1335	#endif
1336	}
1337
1338
1339	/**
1340	* Atomically Compare and Exchange a pointer value, additionally
1341	* passing back old value, ordered.
1342	*
1343	* @returns true if xchg was done.
1344	* @returns false if xchg wasn't done.
1345	*
1346	* @param ppv Pointer to the value to update.
1347	* @param pvNew The new value to assigned to *ppv.
1348	* @param pvOld The old value to *ppv compare with.
1349	* @param ppvOld Pointer store the old value at.
1350	*
1351	* @remarks This is relatively type safe on GCC platforms.
1352	* @remarks x86: Requires a 486 or later.
1353	*/
1354	#ifdef __GNUC__
1355	# define ASMAtomicCmpXchgExPtr(ppv, pvNew, pvOld, ppvOld) \
1356	__extension__ \
1357	({\
1358	__typeof__((ppv)) volatile const ppvTypeChecked = (ppv); \
1359	__typeof__(*(ppv)) const pvNewTypeChecked = (pvNew); \
1360	__typeof__(*(ppv)) const pvOldTypeChecked = (pvOld); \
1361	__typeof__((ppv)) const ppvOldTypeChecked = (ppvOld); \
1362	bool fMacroRet = ASMAtomicCmpXchgExPtrVoid((void * volatile *)ppvTypeChecked, \
1363	(void )pvNewTypeChecked, (void )pvOldTypeChecked, \
1364	(void **)ppvOldTypeChecked); \
1365	fMacroRet; \
1366	})
1367	#else
1368	# define ASMAtomicCmpXchgExPtr(ppv, pvNew, pvOld, ppvOld) \
1369	ASMAtomicCmpXchgExPtrVoid((void * volatile )(ppv), (void )(pvNew), (void )(pvOld), (void *)(ppvOld))
1370	#endif
1371
1372
1373	/**
1374	* Virtualization unfriendly serializing instruction, always exits.
1375	*/
1376	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
1377	DECLASM(void) ASMSerializeInstructionCpuId(void);
1378	#else
1379	DECLINLINE(void) ASMSerializeInstructionCpuId(void)
1380	{
1381	# if RT_INLINE_ASM_GNU_STYLE
1382	RTCCUINTREG xAX = 0;
1383	# ifdef RT_ARCH_AMD64
1384	__asm__ __volatile__ ("cpuid"
1385	: "=a" (xAX)
1386	: "0" (xAX)
1387	: "rbx", "rcx", "rdx", "memory");
1388	# elif (defined(PIC) \|\| defined(__PIC__)) && defined(__i386__)
1389	__asm__ __volatile__ ("push %%ebx\n\t"
1390	"cpuid\n\t"
1391	"pop %%ebx\n\t"
1392	: "=a" (xAX)
1393	: "0" (xAX)
1394	: "ecx", "edx", "memory");
1395	# else
1396	__asm__ __volatile__ ("cpuid"
1397	: "=a" (xAX)
1398	: "0" (xAX)
1399	: "ebx", "ecx", "edx", "memory");
1400	# endif
1401
1402	# elif RT_INLINE_ASM_USES_INTRIN
1403	int aInfo[4];
1404	_ReadWriteBarrier();
1405	__cpuid(aInfo, 0);
1406
1407	# else
1408	__asm
1409	{
1410	push ebx
1411	xor eax, eax
1412	cpuid
1413	pop ebx
1414	}
1415	# endif
1416	}
1417	#endif
1418
1419	/**
1420	* Virtualization friendly serializing instruction, though more expensive.
1421	*/
1422	#if RT_INLINE_ASM_EXTERNAL
1423	DECLASM(void) ASMSerializeInstructionIRet(void);
1424	#else
1425	DECLINLINE(void) ASMSerializeInstructionIRet(void)
1426	{
1427	# if RT_INLINE_ASM_GNU_STYLE
1428	# ifdef RT_ARCH_AMD64
1429	__asm__ __volatile__ ("movq %%rsp,%%r10\n\t"
1430	"subq $128, %%rsp\n\t" /redzone/
1431	"mov %%ss, %%eax\n\t"
1432	"pushq %%rax\n\t"
1433	"pushq %%r10\n\t"
1434	"pushfq\n\t"
1435	"movl %%cs, %%eax\n\t"
1436	"pushq %%rax\n\t"
1437	"leaq 1f(%%rip), %%rax\n\t"
1438	"pushq %%rax\n\t"
1439	"iretq\n\t"
1440	"1:\n\t"
1441	::: "rax", "r10", "memory");
1442	# else
1443	__asm__ __volatile__ ("pushfl\n\t"
1444	"pushl %%cs\n\t"
1445	"pushl $1f\n\t"
1446	"iretl\n\t"
1447	"1:\n\t"
1448	::: "memory");
1449	# endif
1450
1451	# else
1452	__asm
1453	{
1454	pushfd
1455	push cs
1456	push la_ret
1457	iretd
1458	la_ret:
1459	}
1460	# endif
1461	}
1462	#endif
1463
1464	/**
1465	* Virtualization friendlier serializing instruction, may still cause exits.
1466	*/
1467	#if RT_INLINE_ASM_EXTERNAL && RT_INLINE_ASM_USES_INTRIN < 15
1468	DECLASM(void) ASMSerializeInstructionRdTscp(void);
1469	#else
1470	DECLINLINE(void) ASMSerializeInstructionRdTscp(void)
1471	{
1472	# if RT_INLINE_ASM_GNU_STYLE
1473	/* rdtscp is not supported by ancient linux build VM of course :-( */
1474	# ifdef RT_ARCH_AMD64
1475	/__asm__ __volatile__("rdtscp\n\t" ::: "rax", "rdx, "rcx"); /
1476	__asm__ __volatile__(".byte 0x0f,0x01,0xf9\n\t" ::: "rax", "rdx", "rcx", "memory");
1477	# else
1478	/__asm__ __volatile__("rdtscp\n\t" ::: "eax", "edx, "ecx"); /
1479	__asm__ __volatile__(".byte 0x0f,0x01,0xf9\n\t" ::: "eax", "edx", "ecx", "memory");
1480	# endif
1481	# else
1482	# if RT_INLINE_ASM_USES_INTRIN >= 15
1483	uint32_t uIgnore;
1484	_ReadWriteBarrier();
1485	(void)__rdtscp(&uIgnore);
1486	(void)uIgnore;
1487	# else
1488	__asm
1489	{
1490	rdtscp
1491	}
1492	# endif
1493	# endif
1494	}
1495	#endif
1496
1497
1498	/**
1499	* Serialize Instruction.
1500	*/
1501	#if (defined(RT_ARCH_X86) && ARCH_BITS == 16) \|\| defined(IN_GUEST)
1502	# define ASMSerializeInstruction() ASMSerializeInstructionIRet()
1503	#else
1504	# define ASMSerializeInstruction() ASMSerializeInstructionCpuId()
1505	#endif
1506
1507
1508	/**
1509	* Memory fence, waits for any pending writes and reads to complete.
1510	*/
1511	DECLINLINE(void) ASMMemoryFence(void)
1512	{
1513	/** @todo use mfence? check if all cpus we care for support it. */
1514	#if ARCH_BITS == 16
1515	uint16_t volatile u16;
1516	ASMAtomicXchgU16(&u16, 0);
1517	#else
1518	uint32_t volatile u32;
1519	ASMAtomicXchgU32(&u32, 0);
1520	#endif
1521	}
1522
1523
1524	/**
1525	* Write fence, waits for any pending writes to complete.
1526	*/
1527	DECLINLINE(void) ASMWriteFence(void)
1528	{
1529	/** @todo use sfence? check if all cpus we care for support it. */
1530	ASMMemoryFence();
1531	}
1532
1533
1534	/**
1535	* Read fence, waits for any pending reads to complete.
1536	*/
1537	DECLINLINE(void) ASMReadFence(void)
1538	{
1539	/** @todo use lfence? check if all cpus we care for support it. */
1540	ASMMemoryFence();
1541	}
1542
1543
1544	/**
1545	* Atomically reads an unsigned 8-bit value, ordered.
1546	*
1547	* @returns Current *pu8 value
1548	* @param pu8 Pointer to the 8-bit variable to read.
1549	*/
1550	DECLINLINE(uint8_t) ASMAtomicReadU8(volatile uint8_t *pu8)
1551	{
1552	ASMMemoryFence();
1553	return pu8; / byte reads are atomic on x86 */
1554	}
1555
1556
1557	/**
1558	* Atomically reads an unsigned 8-bit value, unordered.
1559	*
1560	* @returns Current *pu8 value
1561	* @param pu8 Pointer to the 8-bit variable to read.
1562	*/
1563	DECLINLINE(uint8_t) ASMAtomicUoReadU8(volatile uint8_t *pu8)
1564	{
1565	return pu8; / byte reads are atomic on x86 */
1566	}
1567
1568
1569	/**
1570	* Atomically reads a signed 8-bit value, ordered.
1571	*
1572	* @returns Current *pi8 value
1573	* @param pi8 Pointer to the 8-bit variable to read.
1574	*/
1575	DECLINLINE(int8_t) ASMAtomicReadS8(volatile int8_t *pi8)
1576	{
1577	ASMMemoryFence();
1578	return pi8; / byte reads are atomic on x86 */
1579	}
1580
1581
1582	/**
1583	* Atomically reads a signed 8-bit value, unordered.
1584	*
1585	* @returns Current *pi8 value
1586	* @param pi8 Pointer to the 8-bit variable to read.
1587	*/
1588	DECLINLINE(int8_t) ASMAtomicUoReadS8(volatile int8_t *pi8)
1589	{
1590	return pi8; / byte reads are atomic on x86 */
1591	}
1592
1593
1594	/**
1595	* Atomically reads an unsigned 16-bit value, ordered.
1596	*
1597	* @returns Current *pu16 value
1598	* @param pu16 Pointer to the 16-bit variable to read.
1599	*/
1600	DECLINLINE(uint16_t) ASMAtomicReadU16(volatile uint16_t *pu16)
1601	{
1602	ASMMemoryFence();
1603	Assert(!((uintptr_t)pu16 & 1));
1604	return *pu16;
1605	}
1606
1607
1608	/**
1609	* Atomically reads an unsigned 16-bit value, unordered.
1610	*
1611	* @returns Current *pu16 value
1612	* @param pu16 Pointer to the 16-bit variable to read.
1613	*/
1614	DECLINLINE(uint16_t) ASMAtomicUoReadU16(volatile uint16_t *pu16)
1615	{
1616	Assert(!((uintptr_t)pu16 & 1));
1617	return *pu16;
1618	}
1619
1620
1621	/**
1622	* Atomically reads a signed 16-bit value, ordered.
1623	*
1624	* @returns Current *pi16 value
1625	* @param pi16 Pointer to the 16-bit variable to read.
1626	*/
1627	DECLINLINE(int16_t) ASMAtomicReadS16(volatile int16_t *pi16)
1628	{
1629	ASMMemoryFence();
1630	Assert(!((uintptr_t)pi16 & 1));
1631	return *pi16;
1632	}
1633
1634
1635	/**
1636	* Atomically reads a signed 16-bit value, unordered.
1637	*
1638	* @returns Current *pi16 value
1639	* @param pi16 Pointer to the 16-bit variable to read.
1640	*/
1641	DECLINLINE(int16_t) ASMAtomicUoReadS16(volatile int16_t *pi16)
1642	{
1643	Assert(!((uintptr_t)pi16 & 1));
1644	return *pi16;
1645	}
1646
1647
1648	/**
1649	* Atomically reads an unsigned 32-bit value, ordered.
1650	*
1651	* @returns Current *pu32 value
1652	* @param pu32 Pointer to the 32-bit variable to read.
1653	*/
1654	DECLINLINE(uint32_t) ASMAtomicReadU32(volatile uint32_t *pu32)
1655	{
1656	ASMMemoryFence();
1657	Assert(!((uintptr_t)pu32 & 3));
1658	#if ARCH_BITS == 16
1659	AssertFailed(); /** @todo 16-bit */
1660	#endif
1661	return *pu32;
1662	}
1663
1664
1665	/**
1666	* Atomically reads an unsigned 32-bit value, unordered.
1667	*
1668	* @returns Current *pu32 value
1669	* @param pu32 Pointer to the 32-bit variable to read.
1670	*/
1671	DECLINLINE(uint32_t) ASMAtomicUoReadU32(volatile uint32_t *pu32)
1672	{
1673	Assert(!((uintptr_t)pu32 & 3));
1674	#if ARCH_BITS == 16
1675	AssertFailed(); /** @todo 16-bit */
1676	#endif
1677	return *pu32;
1678	}
1679
1680
1681	/**
1682	* Atomically reads a signed 32-bit value, ordered.
1683	*
1684	* @returns Current *pi32 value
1685	* @param pi32 Pointer to the 32-bit variable to read.
1686	*/
1687	DECLINLINE(int32_t) ASMAtomicReadS32(volatile int32_t *pi32)
1688	{
1689	ASMMemoryFence();
1690	Assert(!((uintptr_t)pi32 & 3));
1691	#if ARCH_BITS == 16
1692	AssertFailed(); /** @todo 16-bit */
1693	#endif
1694	return *pi32;
1695	}
1696
1697
1698	/**
1699	* Atomically reads a signed 32-bit value, unordered.
1700	*
1701	* @returns Current *pi32 value
1702	* @param pi32 Pointer to the 32-bit variable to read.
1703	*/
1704	DECLINLINE(int32_t) ASMAtomicUoReadS32(volatile int32_t *pi32)
1705	{
1706	Assert(!((uintptr_t)pi32 & 3));
1707	#if ARCH_BITS == 16
1708	AssertFailed(); /** @todo 16-bit */
1709	#endif
1710	return *pi32;
1711	}
1712
1713
1714	/**
1715	* Atomically reads an unsigned 64-bit value, ordered.
1716	*
1717	* @returns Current *pu64 value
1718	* @param pu64 Pointer to the 64-bit variable to read.
1719	* The memory pointed to must be writable.
1720	*
1721	* @remarks This may fault if the memory is read-only!
1722	* @remarks x86: Requires a Pentium or later.
1723	*/
1724	#if (RT_INLINE_ASM_EXTERNAL && !defined(RT_ARCH_AMD64)) \
1725	\|\| RT_INLINE_DONT_MIX_CMPXCHG8B_AND_PIC
1726	DECLASM(uint64_t) ASMAtomicReadU64(volatile uint64_t *pu64);
1727	#else
1728	DECLINLINE(uint64_t) ASMAtomicReadU64(volatile uint64_t *pu64)
1729	{
1730	uint64_t u64;
1731	# ifdef RT_ARCH_AMD64
1732	Assert(!((uintptr_t)pu64 & 7));
1733	/*# if RT_INLINE_ASM_GNU_STYLE
1734	__asm__ __volatile__( "mfence\n\t"
1735	"movq %1, %0\n\t"
1736	: "=r" (u64)
1737	: "m" (*pu64));
1738	# else
1739	__asm
1740	{
1741	mfence
1742	mov rdx, [pu64]
1743	mov rax, [rdx]
1744	mov [u64], rax
1745	}
1746	# endif*/
1747	ASMMemoryFence();
1748	u64 = *pu64;
1749	# else /* !RT_ARCH_AMD64 */
1750	# if RT_INLINE_ASM_GNU_STYLE
1751	# if defined(PIC) \|\| defined(__PIC__)
1752	uint32_t u32EBX = 0;
1753	Assert(!((uintptr_t)pu64 & 7));
1754	__asm__ __volatile__("xchgl %%ebx, %3\n\t"
1755	"lock; cmpxchg8b (%5)\n\t"
1756	"movl %3, %%ebx\n\t"
1757	: "=A" (u64),
1758	# if RT_GNUC_PREREQ(4, 3)
1759	"+m" (*pu64)
1760	# else
1761	"=m" (*pu64)
1762	# endif
1763	: "0" (0ULL),
1764	"m" (u32EBX),
1765	"c" (0),
1766	"S" (pu64));
1767	# else /* !PIC */
1768	__asm__ __volatile__("lock; cmpxchg8b %1\n\t"
1769	: "=A" (u64),
1770	"+m" (*pu64)
1771	: "0" (0ULL),
1772	"b" (0),
1773	"c" (0));
1774	# endif
1775	# else
1776	Assert(!((uintptr_t)pu64 & 7));
1777	__asm
1778	{
1779	xor eax, eax
1780	xor edx, edx
1781	mov edi, pu64
1782	xor ecx, ecx
1783	xor ebx, ebx
1784	lock cmpxchg8b [edi]
1785	mov dword ptr [u64], eax
1786	mov dword ptr [u64 + 4], edx
1787	}
1788	# endif
1789	# endif /* !RT_ARCH_AMD64 */
1790	return u64;
1791	}
1792	#endif
1793
1794
1795	/**
1796	* Atomically reads an unsigned 64-bit value, unordered.
1797	*
1798	* @returns Current *pu64 value
1799	* @param pu64 Pointer to the 64-bit variable to read.
1800	* The memory pointed to must be writable.
1801	*
1802	* @remarks This may fault if the memory is read-only!
1803	* @remarks x86: Requires a Pentium or later.
1804	*/
1805	#if !defined(RT_ARCH_AMD64) \
1806	&& ( (RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN) \
1807	\|\| RT_INLINE_DONT_MIX_CMPXCHG8B_AND_PIC)
1808	DECLASM(uint64_t) ASMAtomicUoReadU64(volatile uint64_t *pu64);
1809	#else
1810	DECLINLINE(uint64_t) ASMAtomicUoReadU64(volatile uint64_t *pu64)
1811	{
1812	uint64_t u64;
1813	# ifdef RT_ARCH_AMD64
1814	Assert(!((uintptr_t)pu64 & 7));
1815	/*# if RT_INLINE_ASM_GNU_STYLE
1816	Assert(!((uintptr_t)pu64 & 7));
1817	__asm__ __volatile__("movq %1, %0\n\t"
1818	: "=r" (u64)
1819	: "m" (*pu64));
1820	# else
1821	__asm
1822	{
1823	mov rdx, [pu64]
1824	mov rax, [rdx]
1825	mov [u64], rax
1826	}
1827	# endif */
1828	u64 = *pu64;
1829	# else /* !RT_ARCH_AMD64 */
1830	# if RT_INLINE_ASM_GNU_STYLE
1831	# if defined(PIC) \|\| defined(__PIC__)
1832	uint32_t u32EBX = 0;
1833	uint32_t u32Spill;
1834	Assert(!((uintptr_t)pu64 & 7));
1835	__asm__ __volatile__("xor %%eax,%%eax\n\t"
1836	"xor %%ecx,%%ecx\n\t"
1837	"xor %%edx,%%edx\n\t"
1838	"xchgl %%ebx, %3\n\t"
1839	"lock; cmpxchg8b (%4)\n\t"
1840	"movl %3, %%ebx\n\t"
1841	: "=A" (u64),
1842	# if RT_GNUC_PREREQ(4, 3)
1843	"+m" (*pu64),
1844	# else
1845	"=m" (*pu64),
1846	# endif
1847	"=c" (u32Spill)
1848	: "m" (u32EBX),
1849	"S" (pu64));
1850	# else /* !PIC */
1851	__asm__ __volatile__("lock; cmpxchg8b %1\n\t"
1852	: "=A" (u64),
1853	"+m" (*pu64)
1854	: "0" (0ULL),
1855	"b" (0),
1856	"c" (0));
1857	# endif
1858	# else
1859	Assert(!((uintptr_t)pu64 & 7));
1860	__asm
1861	{
1862	xor eax, eax
1863	xor edx, edx
1864	mov edi, pu64
1865	xor ecx, ecx
1866	xor ebx, ebx
1867	lock cmpxchg8b [edi]
1868	mov dword ptr [u64], eax
1869	mov dword ptr [u64 + 4], edx
1870	}
1871	# endif
1872	# endif /* !RT_ARCH_AMD64 */
1873	return u64;
1874	}
1875	#endif
1876
1877
1878	/**
1879	* Atomically reads a signed 64-bit value, ordered.
1880	*
1881	* @returns Current *pi64 value
1882	* @param pi64 Pointer to the 64-bit variable to read.
1883	* The memory pointed to must be writable.
1884	*
1885	* @remarks This may fault if the memory is read-only!
1886	* @remarks x86: Requires a Pentium or later.
1887	*/
1888	DECLINLINE(int64_t) ASMAtomicReadS64(volatile int64_t *pi64)
1889	{
1890	return (int64_t)ASMAtomicReadU64((volatile uint64_t *)pi64);
1891	}
1892
1893
1894	/**
1895	* Atomically reads a signed 64-bit value, unordered.
1896	*
1897	* @returns Current *pi64 value
1898	* @param pi64 Pointer to the 64-bit variable to read.
1899	* The memory pointed to must be writable.
1900	*
1901	* @remarks This will fault if the memory is read-only!
1902	* @remarks x86: Requires a Pentium or later.
1903	*/
1904	DECLINLINE(int64_t) ASMAtomicUoReadS64(volatile int64_t *pi64)
1905	{
1906	return (int64_t)ASMAtomicUoReadU64((volatile uint64_t *)pi64);
1907	}
1908
1909
1910	/**
1911	* Atomically reads a size_t value, ordered.
1912	*
1913	* @returns Current *pcb value
1914	* @param pcb Pointer to the size_t variable to read.
1915	*/
1916	DECLINLINE(size_t) ASMAtomicReadZ(size_t volatile *pcb)
1917	{
1918	#if ARCH_BITS == 64
1919	return ASMAtomicReadU64((uint64_t volatile *)pcb);
1920	#elif ARCH_BITS == 32
1921	return ASMAtomicReadU32((uint32_t volatile *)pcb);
1922	#elif ARCH_BITS == 16
1923	AssertCompileSize(size_t, 2);
1924	return ASMAtomicReadU16((uint16_t volatile *)pcb);
1925	#else
1926	# error "Unsupported ARCH_BITS value"
1927	#endif
1928	}
1929
1930
1931	/**
1932	* Atomically reads a size_t value, unordered.
1933	*
1934	* @returns Current *pcb value
1935	* @param pcb Pointer to the size_t variable to read.
1936	*/
1937	DECLINLINE(size_t) ASMAtomicUoReadZ(size_t volatile *pcb)
1938	{
1939	#if ARCH_BITS == 64 \|\| (ARCH_BITS == 16 && RT_FAR_DATA)
1940	return ASMAtomicUoReadU64((uint64_t volatile *)pcb);
1941	#elif ARCH_BITS == 32
1942	return ASMAtomicUoReadU32((uint32_t volatile *)pcb);
1943	#elif ARCH_BITS == 16
1944	AssertCompileSize(size_t, 2);
1945	return ASMAtomicUoReadU16((uint16_t volatile *)pcb);
1946	#else
1947	# error "Unsupported ARCH_BITS value"
1948	#endif
1949	}
1950
1951
1952	/**
1953	* Atomically reads a pointer value, ordered.
1954	*
1955	* @returns Current *pv value
1956	* @param ppv Pointer to the pointer variable to read.
1957	*
1958	* @remarks Please use ASMAtomicReadPtrT, it provides better type safety and
1959	* requires less typing (no casts).
1960	*/
1961	DECLINLINE(void ) ASMAtomicReadPtr(void volatile *ppv)
1962	{
1963	#if ARCH_BITS == 32 \|\| (ARCH_BITS == 16 && RT_FAR_DATA)
1964	return (void )ASMAtomicReadU32((volatile uint32_t )(void *)ppv);
1965	#elif ARCH_BITS == 64
1966	return (void )ASMAtomicReadU64((volatile uint64_t )(void *)ppv);
1967	#else
1968	# error "ARCH_BITS is bogus"
1969	#endif
1970	}
1971
1972	/**
1973	* Convenience macro for avoiding the annoying casting with ASMAtomicReadPtr.
1974	*
1975	* @returns Current *pv value
1976	* @param ppv Pointer to the pointer variable to read.
1977	* @param Type The type of *ppv, sans volatile.
1978	*/
1979	#ifdef __GNUC__
1980	# define ASMAtomicReadPtrT(ppv, Type) \
1981	__extension__ \
1982	({\
1983	__typeof__((ppv)) volatile ppvTypeChecked = (ppv); \
1984	Type pvTypeChecked = (__typeof__((ppv))) ASMAtomicReadPtr((void volatile *)ppvTypeChecked); \
1985	pvTypeChecked; \
1986	})
1987	#else
1988	# define ASMAtomicReadPtrT(ppv, Type) \
1989	(Type)ASMAtomicReadPtr((void * volatile *)(ppv))
1990	#endif
1991
1992
1993	/**
1994	* Atomically reads a pointer value, unordered.
1995	*
1996	* @returns Current *pv value
1997	* @param ppv Pointer to the pointer variable to read.
1998	*
1999	* @remarks Please use ASMAtomicUoReadPtrT, it provides better type safety and
2000	* requires less typing (no casts).
2001	*/
2002	DECLINLINE(void ) ASMAtomicUoReadPtr(void volatile *ppv)
2003	{
2004	#if ARCH_BITS == 32 \|\| (ARCH_BITS == 16 && RT_FAR_DATA)
2005	return (void )ASMAtomicUoReadU32((volatile uint32_t )(void *)ppv);
2006	#elif ARCH_BITS == 64
2007	return (void )ASMAtomicUoReadU64((volatile uint64_t )(void *)ppv);
2008	#else
2009	# error "ARCH_BITS is bogus"
2010	#endif
2011	}
2012
2013
2014	/**
2015	* Convenience macro for avoiding the annoying casting with ASMAtomicUoReadPtr.
2016	*
2017	* @returns Current *pv value
2018	* @param ppv Pointer to the pointer variable to read.
2019	* @param Type The type of *ppv, sans volatile.
2020	*/
2021	#ifdef __GNUC__
2022	# define ASMAtomicUoReadPtrT(ppv, Type) \
2023	__extension__ \
2024	({\
2025	__typeof__((ppv)) volatile const ppvTypeChecked = (ppv); \
2026	Type pvTypeChecked = (__typeof__((ppv))) ASMAtomicUoReadPtr((void volatile *)ppvTypeChecked); \
2027	pvTypeChecked; \
2028	})
2029	#else
2030	# define ASMAtomicUoReadPtrT(ppv, Type) \
2031	(Type)ASMAtomicUoReadPtr((void * volatile *)(ppv))
2032	#endif
2033
2034
2035	/**
2036	* Atomically reads a boolean value, ordered.
2037	*
2038	* @returns Current *pf value
2039	* @param pf Pointer to the boolean variable to read.
2040	*/
2041	DECLINLINE(bool) ASMAtomicReadBool(volatile bool *pf)
2042	{
2043	ASMMemoryFence();
2044	return pf; / byte reads are atomic on x86 */
2045	}
2046
2047
2048	/**
2049	* Atomically reads a boolean value, unordered.
2050	*
2051	* @returns Current *pf value
2052	* @param pf Pointer to the boolean variable to read.
2053	*/
2054	DECLINLINE(bool) ASMAtomicUoReadBool(volatile bool *pf)
2055	{
2056	return pf; / byte reads are atomic on x86 */
2057	}
2058
2059
2060	/**
2061	* Atomically read a typical IPRT handle value, ordered.
2062	*
2063	* @param ph Pointer to the handle variable to read.
2064	* @param phRes Where to store the result.
2065	*
2066	* @remarks This doesn't currently work for all handles (like RTFILE).
2067	*/
2068	#if HC_ARCH_BITS == 32 \|\| (ARCH_BITS == 16 && RT_FAR_DATA)
2069	# define ASMAtomicReadHandle(ph, phRes) \
2070	do { \
2071	AssertCompile(sizeof(*(ph)) == sizeof(uint32_t)); \
2072	AssertCompile(sizeof(*(phRes)) == sizeof(uint32_t)); \
2073	(uint32_t )(phRes) = ASMAtomicReadU32((uint32_t volatile *)(ph)); \
2074	} while (0)
2075	#elif HC_ARCH_BITS == 64
2076	# define ASMAtomicReadHandle(ph, phRes) \
2077	do { \
2078	AssertCompile(sizeof(*(ph)) == sizeof(uint64_t)); \
2079	AssertCompile(sizeof(*(phRes)) == sizeof(uint64_t)); \
2080	(uint64_t )(phRes) = ASMAtomicReadU64((uint64_t volatile *)(ph)); \
2081	} while (0)
2082	#else
2083	# error HC_ARCH_BITS
2084	#endif
2085
2086
2087	/**
2088	* Atomically read a typical IPRT handle value, unordered.
2089	*
2090	* @param ph Pointer to the handle variable to read.
2091	* @param phRes Where to store the result.
2092	*
2093	* @remarks This doesn't currently work for all handles (like RTFILE).
2094	*/
2095	#if HC_ARCH_BITS == 32 \|\| (ARCH_BITS == 16 && RT_FAR_DATA)
2096	# define ASMAtomicUoReadHandle(ph, phRes) \
2097	do { \
2098	AssertCompile(sizeof(*(ph)) == sizeof(uint32_t)); \
2099	AssertCompile(sizeof(*(phRes)) == sizeof(uint32_t)); \
2100	(uint32_t )(phRes) = ASMAtomicUoReadU32((uint32_t volatile *)(ph)); \
2101	} while (0)
2102	#elif HC_ARCH_BITS == 64
2103	# define ASMAtomicUoReadHandle(ph, phRes) \
2104	do { \
2105	AssertCompile(sizeof(*(ph)) == sizeof(uint64_t)); \
2106	AssertCompile(sizeof(*(phRes)) == sizeof(uint64_t)); \
2107	(uint64_t )(phRes) = ASMAtomicUoReadU64((uint64_t volatile *)(ph)); \
2108	} while (0)
2109	#else
2110	# error HC_ARCH_BITS
2111	#endif
2112
2113
2114	/**
2115	* Atomically read a value which size might differ
2116	* between platforms or compilers, ordered.
2117	*
2118	* @param pu Pointer to the variable to read.
2119	* @param puRes Where to store the result.
2120	*/
2121	#define ASMAtomicReadSize(pu, puRes) \
2122	do { \
2123	switch (sizeof(*(pu))) { \
2124	case 1: (uint8_t )(puRes) = ASMAtomicReadU8( (volatile uint8_t )(void )(pu)); break; \
2125	case 2: (uint16_t )(puRes) = ASMAtomicReadU16((volatile uint16_t )(void )(pu)); break; \
2126	case 4: (uint32_t )(puRes) = ASMAtomicReadU32((volatile uint32_t )(void )(pu)); break; \
2127	case 8: (uint64_t )(puRes) = ASMAtomicReadU64((volatile uint64_t )(void )(pu)); break; \
2128	default: AssertMsgFailed(("ASMAtomicReadSize: size %d is not supported\n", sizeof(*(pu)))); \
2129	} \
2130	} while (0)
2131
2132
2133	/**
2134	* Atomically read a value which size might differ
2135	* between platforms or compilers, unordered.
2136	*
2137	* @param pu Pointer to the variable to read.
2138	* @param puRes Where to store the result.
2139	*/
2140	#define ASMAtomicUoReadSize(pu, puRes) \
2141	do { \
2142	switch (sizeof(*(pu))) { \
2143	case 1: (uint8_t )(puRes) = ASMAtomicUoReadU8( (volatile uint8_t )(void )(pu)); break; \
2144	case 2: (uint16_t )(puRes) = ASMAtomicUoReadU16((volatile uint16_t )(void )(pu)); break; \
2145	case 4: (uint32_t )(puRes) = ASMAtomicUoReadU32((volatile uint32_t )(void )(pu)); break; \
2146	case 8: (uint64_t )(puRes) = ASMAtomicUoReadU64((volatile uint64_t )(void )(pu)); break; \
2147	default: AssertMsgFailed(("ASMAtomicReadSize: size %d is not supported\n", sizeof(*(pu)))); \
2148	} \
2149	} while (0)
2150
2151
2152	/**
2153	* Atomically writes an unsigned 8-bit value, ordered.
2154	*
2155	* @param pu8 Pointer to the 8-bit variable.
2156	* @param u8 The 8-bit value to assign to *pu8.
2157	*/
2158	DECLINLINE(void) ASMAtomicWriteU8(volatile uint8_t *pu8, uint8_t u8)
2159	{
2160	ASMAtomicXchgU8(pu8, u8);
2161	}
2162
2163
2164	/**
2165	* Atomically writes an unsigned 8-bit value, unordered.
2166	*
2167	* @param pu8 Pointer to the 8-bit variable.
2168	* @param u8 The 8-bit value to assign to *pu8.
2169	*/
2170	DECLINLINE(void) ASMAtomicUoWriteU8(volatile uint8_t *pu8, uint8_t u8)
2171	{
2172	pu8 = u8; / byte writes are atomic on x86 */
2173	}
2174
2175
2176	/**
2177	* Atomically writes a signed 8-bit value, ordered.
2178	*
2179	* @param pi8 Pointer to the 8-bit variable to read.
2180	* @param i8 The 8-bit value to assign to *pi8.
2181	*/
2182	DECLINLINE(void) ASMAtomicWriteS8(volatile int8_t *pi8, int8_t i8)
2183	{
2184	ASMAtomicXchgS8(pi8, i8);
2185	}
2186
2187
2188	/**
2189	* Atomically writes a signed 8-bit value, unordered.
2190	*
2191	* @param pi8 Pointer to the 8-bit variable to write.
2192	* @param i8 The 8-bit value to assign to *pi8.
2193	*/
2194	DECLINLINE(void) ASMAtomicUoWriteS8(volatile int8_t *pi8, int8_t i8)
2195	{
2196	pi8 = i8; / byte writes are atomic on x86 */
2197	}
2198
2199
2200	/**
2201	* Atomically writes an unsigned 16-bit value, ordered.
2202	*
2203	* @param pu16 Pointer to the 16-bit variable to write.
2204	* @param u16 The 16-bit value to assign to *pu16.
2205	*/
2206	DECLINLINE(void) ASMAtomicWriteU16(volatile uint16_t *pu16, uint16_t u16)
2207	{
2208	ASMAtomicXchgU16(pu16, u16);
2209	}
2210
2211
2212	/**
2213	* Atomically writes an unsigned 16-bit value, unordered.
2214	*
2215	* @param pu16 Pointer to the 16-bit variable to write.
2216	* @param u16 The 16-bit value to assign to *pu16.
2217	*/
2218	DECLINLINE(void) ASMAtomicUoWriteU16(volatile uint16_t *pu16, uint16_t u16)
2219	{
2220	Assert(!((uintptr_t)pu16 & 1));
2221	*pu16 = u16;
2222	}
2223
2224
2225	/**
2226	* Atomically writes a signed 16-bit value, ordered.
2227	*
2228	* @param pi16 Pointer to the 16-bit variable to write.
2229	* @param i16 The 16-bit value to assign to *pi16.
2230	*/
2231	DECLINLINE(void) ASMAtomicWriteS16(volatile int16_t *pi16, int16_t i16)
2232	{
2233	ASMAtomicXchgS16(pi16, i16);
2234	}
2235
2236
2237	/**
2238	* Atomically writes a signed 16-bit value, unordered.
2239	*
2240	* @param pi16 Pointer to the 16-bit variable to write.
2241	* @param i16 The 16-bit value to assign to *pi16.
2242	*/
2243	DECLINLINE(void) ASMAtomicUoWriteS16(volatile int16_t *pi16, int16_t i16)
2244	{
2245	Assert(!((uintptr_t)pi16 & 1));
2246	*pi16 = i16;
2247	}
2248
2249
2250	/**
2251	* Atomically writes an unsigned 32-bit value, ordered.
2252	*
2253	* @param pu32 Pointer to the 32-bit variable to write.
2254	* @param u32 The 32-bit value to assign to *pu32.
2255	*/
2256	DECLINLINE(void) ASMAtomicWriteU32(volatile uint32_t *pu32, uint32_t u32)
2257	{
2258	ASMAtomicXchgU32(pu32, u32);
2259	}
2260
2261
2262	/**
2263	* Atomically writes an unsigned 32-bit value, unordered.
2264	*
2265	* @param pu32 Pointer to the 32-bit variable to write.
2266	* @param u32 The 32-bit value to assign to *pu32.
2267	*/
2268	DECLINLINE(void) ASMAtomicUoWriteU32(volatile uint32_t *pu32, uint32_t u32)
2269	{
2270	Assert(!((uintptr_t)pu32 & 3));
2271	#if ARCH_BITS >= 32
2272	*pu32 = u32;
2273	#else
2274	ASMAtomicXchgU32(pu32, u32);
2275	#endif
2276	}
2277
2278
2279	/**
2280	* Atomically writes a signed 32-bit value, ordered.
2281	*
2282	* @param pi32 Pointer to the 32-bit variable to write.
2283	* @param i32 The 32-bit value to assign to *pi32.
2284	*/
2285	DECLINLINE(void) ASMAtomicWriteS32(volatile int32_t *pi32, int32_t i32)
2286	{
2287	ASMAtomicXchgS32(pi32, i32);
2288	}
2289
2290
2291	/**
2292	* Atomically writes a signed 32-bit value, unordered.
2293	*
2294	* @param pi32 Pointer to the 32-bit variable to write.
2295	* @param i32 The 32-bit value to assign to *pi32.
2296	*/
2297	DECLINLINE(void) ASMAtomicUoWriteS32(volatile int32_t *pi32, int32_t i32)
2298	{
2299	Assert(!((uintptr_t)pi32 & 3));
2300	#if ARCH_BITS >= 32
2301	*pi32 = i32;
2302	#else
2303	ASMAtomicXchgS32(pi32, i32);
2304	#endif
2305	}
2306
2307
2308	/**
2309	* Atomically writes an unsigned 64-bit value, ordered.
2310	*
2311	* @param pu64 Pointer to the 64-bit variable to write.
2312	* @param u64 The 64-bit value to assign to *pu64.
2313	*/
2314	DECLINLINE(void) ASMAtomicWriteU64(volatile uint64_t *pu64, uint64_t u64)
2315	{
2316	ASMAtomicXchgU64(pu64, u64);
2317	}
2318
2319
2320	/**
2321	* Atomically writes an unsigned 64-bit value, unordered.
2322	*
2323	* @param pu64 Pointer to the 64-bit variable to write.
2324	* @param u64 The 64-bit value to assign to *pu64.
2325	*/
2326	DECLINLINE(void) ASMAtomicUoWriteU64(volatile uint64_t *pu64, uint64_t u64)
2327	{
2328	Assert(!((uintptr_t)pu64 & 7));
2329	#if ARCH_BITS == 64
2330	*pu64 = u64;
2331	#else
2332	ASMAtomicXchgU64(pu64, u64);
2333	#endif
2334	}
2335
2336
2337	/**
2338	* Atomically writes a signed 64-bit value, ordered.
2339	*
2340	* @param pi64 Pointer to the 64-bit variable to write.
2341	* @param i64 The 64-bit value to assign to *pi64.
2342	*/
2343	DECLINLINE(void) ASMAtomicWriteS64(volatile int64_t *pi64, int64_t i64)
2344	{
2345	ASMAtomicXchgS64(pi64, i64);
2346	}
2347
2348
2349	/**
2350	* Atomically writes a signed 64-bit value, unordered.
2351	*
2352	* @param pi64 Pointer to the 64-bit variable to write.
2353	* @param i64 The 64-bit value to assign to *pi64.
2354	*/
2355	DECLINLINE(void) ASMAtomicUoWriteS64(volatile int64_t *pi64, int64_t i64)
2356	{
2357	Assert(!((uintptr_t)pi64 & 7));
2358	#if ARCH_BITS == 64
2359	*pi64 = i64;
2360	#else
2361	ASMAtomicXchgS64(pi64, i64);
2362	#endif
2363	}
2364
2365
2366	/**
2367	* Atomically writes a boolean value, unordered.
2368	*
2369	* @param pf Pointer to the boolean variable to write.
2370	* @param f The boolean value to assign to *pf.
2371	*/
2372	DECLINLINE(void) ASMAtomicWriteBool(volatile bool *pf, bool f)
2373	{
2374	ASMAtomicWriteU8((uint8_t volatile *)pf, f);
2375	}
2376
2377
2378	/**
2379	* Atomically writes a boolean value, unordered.
2380	*
2381	* @param pf Pointer to the boolean variable to write.
2382	* @param f The boolean value to assign to *pf.
2383	*/
2384	DECLINLINE(void) ASMAtomicUoWriteBool(volatile bool *pf, bool f)
2385	{
2386	pf = f; / byte writes are atomic on x86 */
2387	}
2388
2389
2390	/**
2391	* Atomically writes a pointer value, ordered.
2392	*
2393	* @param ppv Pointer to the pointer variable to write.
2394	* @param pv The pointer value to assign to *ppv.
2395	*/
2396	DECLINLINE(void) ASMAtomicWritePtrVoid(void * volatile ppv, const void pv)
2397	{
2398	#if ARCH_BITS == 32 \|\| (ARCH_BITS == 16 && RT_FAR_DATA)
2399	ASMAtomicWriteU32((volatile uint32_t )(void )ppv, (uint32_t)pv);
2400	#elif ARCH_BITS == 64
2401	ASMAtomicWriteU64((volatile uint64_t )(void )ppv, (uint64_t)pv);
2402	#else
2403	# error "ARCH_BITS is bogus"
2404	#endif
2405	}
2406
2407
2408	/**
2409	* Atomically writes a pointer value, ordered.
2410	*
2411	* @param ppv Pointer to the pointer variable to write.
2412	* @param pv The pointer value to assign to *ppv. If NULL use
2413	* ASMAtomicWriteNullPtr or you'll land in trouble.
2414	*
2415	* @remarks This is relatively type safe on GCC platforms when @a pv isn't
2416	* NULL.
2417	*/
2418	#ifdef __GNUC__
2419	# define ASMAtomicWritePtr(ppv, pv) \
2420	do \
2421	{ \
2422	__typeof__((ppv)) volatile const ppvTypeChecked = (ppv); \
2423	__typeof__(*(ppv)) const pvTypeChecked = (pv); \
2424	\
2425	AssertCompile(sizeof(ppv) == sizeof(void )); \
2426	AssertCompile(sizeof(pv) == sizeof(void *)); \
2427	Assert(!( (uintptr_t)ppv & ((ARCH_BITS / 8) - 1) )); \
2428	\
2429	ASMAtomicWritePtrVoid((void * volatile )(ppvTypeChecked), (void )(pvTypeChecked)); \
2430	} while (0)
2431	#else
2432	# define ASMAtomicWritePtr(ppv, pv) \
2433	do \
2434	{ \
2435	AssertCompile(sizeof(ppv) == sizeof(void )); \
2436	AssertCompile(sizeof(pv) == sizeof(void *)); \
2437	Assert(!( (uintptr_t)ppv & ((ARCH_BITS / 8) - 1) )); \
2438	\
2439	ASMAtomicWritePtrVoid((void * volatile )(ppv), (void )(pv)); \
2440	} while (0)
2441	#endif
2442
2443
2444	/**
2445	* Atomically sets a pointer to NULL, ordered.
2446	*
2447	* @param ppv Pointer to the pointer variable that should be set to NULL.
2448	*
2449	* @remarks This is relatively type safe on GCC platforms.
2450	*/
2451	#ifdef __GNUC__
2452	# define ASMAtomicWriteNullPtr(ppv) \
2453	do \
2454	{ \
2455	__typeof__((ppv)) const ppvTypeChecked = (ppv); \
2456	AssertCompile(sizeof(ppv) == sizeof(void )); \
2457	Assert(!( (uintptr_t)ppv & ((ARCH_BITS / 8) - 1) )); \
2458	ASMAtomicWritePtrVoid((void * volatile *)(ppvTypeChecked), NULL); \
2459	} while (0)
2460	#else
2461	# define ASMAtomicWriteNullPtr(ppv) \
2462	do \
2463	{ \
2464	AssertCompile(sizeof(ppv) == sizeof(void )); \
2465	Assert(!( (uintptr_t)ppv & ((ARCH_BITS / 8) - 1) )); \
2466	ASMAtomicWritePtrVoid((void * volatile *)(ppv), NULL); \
2467	} while (0)
2468	#endif
2469
2470
2471	/**
2472	* Atomically writes a pointer value, unordered.
2473	*
2474	* @returns Current *pv value
2475	* @param ppv Pointer to the pointer variable.
2476	* @param pv The pointer value to assign to *ppv. If NULL use
2477	* ASMAtomicUoWriteNullPtr or you'll land in trouble.
2478	*
2479	* @remarks This is relatively type safe on GCC platforms when @a pv isn't
2480	* NULL.
2481	*/
2482	#ifdef __GNUC__
2483	# define ASMAtomicUoWritePtr(ppv, pv) \
2484	do \
2485	{ \
2486	__typeof__((ppv)) volatile const ppvTypeChecked = (ppv); \
2487	__typeof__(*(ppv)) const pvTypeChecked = (pv); \
2488	\
2489	AssertCompile(sizeof(ppv) == sizeof(void )); \
2490	AssertCompile(sizeof(pv) == sizeof(void *)); \
2491	Assert(!( (uintptr_t)ppv & ((ARCH_BITS / 8) - 1) )); \
2492	\
2493	*(ppvTypeChecked) = pvTypeChecked; \
2494	} while (0)
2495	#else
2496	# define ASMAtomicUoWritePtr(ppv, pv) \
2497	do \
2498	{ \
2499	AssertCompile(sizeof(ppv) == sizeof(void )); \
2500	AssertCompile(sizeof(pv) == sizeof(void *)); \
2501	Assert(!( (uintptr_t)ppv & ((ARCH_BITS / 8) - 1) )); \
2502	*(ppv) = pv; \
2503	} while (0)
2504	#endif
2505
2506
2507	/**
2508	* Atomically sets a pointer to NULL, unordered.
2509	*
2510	* @param ppv Pointer to the pointer variable that should be set to NULL.
2511	*
2512	* @remarks This is relatively type safe on GCC platforms.
2513	*/
2514	#ifdef __GNUC__
2515	# define ASMAtomicUoWriteNullPtr(ppv) \
2516	do \
2517	{ \
2518	__typeof__((ppv)) volatile const ppvTypeChecked = (ppv); \
2519	AssertCompile(sizeof(ppv) == sizeof(void )); \
2520	Assert(!( (uintptr_t)ppv & ((ARCH_BITS / 8) - 1) )); \
2521	*(ppvTypeChecked) = NULL; \
2522	} while (0)
2523	#else
2524	# define ASMAtomicUoWriteNullPtr(ppv) \
2525	do \
2526	{ \
2527	AssertCompile(sizeof(ppv) == sizeof(void )); \
2528	Assert(!( (uintptr_t)ppv & ((ARCH_BITS / 8) - 1) )); \
2529	*(ppv) = NULL; \
2530	} while (0)
2531	#endif
2532
2533
2534	/**
2535	* Atomically write a typical IPRT handle value, ordered.
2536	*
2537	* @param ph Pointer to the variable to update.
2538	* @param hNew The value to assign to *ph.
2539	*
2540	* @remarks This doesn't currently work for all handles (like RTFILE).
2541	*/
2542	#if HC_ARCH_BITS == 32 \|\| (ARCH_BITS == 16 && RT_FAR_DATA)
2543	# define ASMAtomicWriteHandle(ph, hNew) \
2544	do { \
2545	AssertCompile(sizeof(*(ph)) == sizeof(uint32_t)); \
2546	ASMAtomicWriteU32((uint32_t volatile *)(ph), (const uint32_t)(hNew)); \
2547	} while (0)
2548	#elif HC_ARCH_BITS == 64
2549	# define ASMAtomicWriteHandle(ph, hNew) \
2550	do { \
2551	AssertCompile(sizeof(*(ph)) == sizeof(uint64_t)); \
2552	ASMAtomicWriteU64((uint64_t volatile *)(ph), (const uint64_t)(hNew)); \
2553	} while (0)
2554	#else
2555	# error HC_ARCH_BITS
2556	#endif
2557
2558
2559	/**
2560	* Atomically write a typical IPRT handle value, unordered.
2561	*
2562	* @param ph Pointer to the variable to update.
2563	* @param hNew The value to assign to *ph.
2564	*
2565	* @remarks This doesn't currently work for all handles (like RTFILE).
2566	*/
2567	#if HC_ARCH_BITS == 32 \|\| (ARCH_BITS == 16 && RT_FAR_DATA)
2568	# define ASMAtomicUoWriteHandle(ph, hNew) \
2569	do { \
2570	AssertCompile(sizeof(*(ph)) == sizeof(uint32_t)); \
2571	ASMAtomicUoWriteU32((uint32_t volatile *)(ph), (const uint32_t)hNew); \
2572	} while (0)
2573	#elif HC_ARCH_BITS == 64
2574	# define ASMAtomicUoWriteHandle(ph, hNew) \
2575	do { \
2576	AssertCompile(sizeof(*(ph)) == sizeof(uint64_t)); \
2577	ASMAtomicUoWriteU64((uint64_t volatile *)(ph), (const uint64_t)hNew); \
2578	} while (0)
2579	#else
2580	# error HC_ARCH_BITS
2581	#endif
2582
2583
2584	/**
2585	* Atomically write a value which size might differ
2586	* between platforms or compilers, ordered.
2587	*
2588	* @param pu Pointer to the variable to update.
2589	* @param uNew The value to assign to *pu.
2590	*/
2591	#define ASMAtomicWriteSize(pu, uNew) \
2592	do { \
2593	switch (sizeof(*(pu))) { \
2594	case 1: ASMAtomicWriteU8( (volatile uint8_t )(void )(pu), (uint8_t )(uNew)); break; \
2595	case 2: ASMAtomicWriteU16((volatile uint16_t )(void )(pu), (uint16_t)(uNew)); break; \
2596	case 4: ASMAtomicWriteU32((volatile uint32_t )(void )(pu), (uint32_t)(uNew)); break; \
2597	case 8: ASMAtomicWriteU64((volatile uint64_t )(void )(pu), (uint64_t)(uNew)); break; \
2598	default: AssertMsgFailed(("ASMAtomicWriteSize: size %d is not supported\n", sizeof(*(pu)))); \
2599	} \
2600	} while (0)
2601
2602	/**
2603	* Atomically write a value which size might differ
2604	* between platforms or compilers, unordered.
2605	*
2606	* @param pu Pointer to the variable to update.
2607	* @param uNew The value to assign to *pu.
2608	*/
2609	#define ASMAtomicUoWriteSize(pu, uNew) \
2610	do { \
2611	switch (sizeof(*(pu))) { \
2612	case 1: ASMAtomicUoWriteU8( (volatile uint8_t )(void )(pu), (uint8_t )(uNew)); break; \
2613	case 2: ASMAtomicUoWriteU16((volatile uint16_t )(void )(pu), (uint16_t)(uNew)); break; \
2614	case 4: ASMAtomicUoWriteU32((volatile uint32_t )(void )(pu), (uint32_t)(uNew)); break; \
2615	case 8: ASMAtomicUoWriteU64((volatile uint64_t )(void )(pu), (uint64_t)(uNew)); break; \
2616	default: AssertMsgFailed(("ASMAtomicWriteSize: size %d is not supported\n", sizeof(*(pu)))); \
2617	} \
2618	} while (0)
2619
2620
2621
2622	/**
2623	* Atomically exchanges and adds to a 16-bit value, ordered.
2624	*
2625	* @returns The old value.
2626	* @param pu16 Pointer to the value.
2627	* @param u16 Number to add.
2628	*
2629	* @remarks Currently not implemented, just to make 16-bit code happy.
2630	* @remarks x86: Requires a 486 or later.
2631	*/
2632	DECLASM(uint16_t) ASMAtomicAddU16(uint16_t volatile *pu16, uint32_t u16);
2633
2634
2635	/**
2636	* Atomically exchanges and adds to a 32-bit value, ordered.
2637	*
2638	* @returns The old value.
2639	* @param pu32 Pointer to the value.
2640	* @param u32 Number to add.
2641	*
2642	* @remarks x86: Requires a 486 or later.
2643	*/
2644	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
2645	DECLASM(uint32_t) ASMAtomicAddU32(uint32_t volatile *pu32, uint32_t u32);
2646	#else
2647	DECLINLINE(uint32_t) ASMAtomicAddU32(uint32_t volatile *pu32, uint32_t u32)
2648	{
2649	# if RT_INLINE_ASM_USES_INTRIN
2650	u32 = _InterlockedExchangeAdd((long *)pu32, u32);
2651	return u32;
2652
2653	# elif RT_INLINE_ASM_GNU_STYLE
2654	__asm__ __volatile__("lock; xaddl %0, %1\n\t"
2655	: "=r" (u32),
2656	"=m" (*pu32)
2657	: "0" (u32),
2658	"m" (*pu32)
2659	: "memory");
2660	return u32;
2661	# else
2662	__asm
2663	{
2664	mov eax, [u32]
2665	# ifdef RT_ARCH_AMD64
2666	mov rdx, [pu32]
2667	lock xadd [rdx], eax
2668	# else
2669	mov edx, [pu32]
2670	lock xadd [edx], eax
2671	# endif
2672	mov [u32], eax
2673	}
2674	return u32;
2675	# endif
2676	}
2677	#endif
2678
2679
2680	/**
2681	* Atomically exchanges and adds to a signed 32-bit value, ordered.
2682	*
2683	* @returns The old value.
2684	* @param pi32 Pointer to the value.
2685	* @param i32 Number to add.
2686	*
2687	* @remarks x86: Requires a 486 or later.
2688	*/
2689	DECLINLINE(int32_t) ASMAtomicAddS32(int32_t volatile *pi32, int32_t i32)
2690	{
2691	return (int32_t)ASMAtomicAddU32((uint32_t volatile *)pi32, (uint32_t)i32);
2692	}
2693
2694
2695	/**
2696	* Atomically exchanges and adds to a 64-bit value, ordered.
2697	*
2698	* @returns The old value.
2699	* @param pu64 Pointer to the value.
2700	* @param u64 Number to add.
2701	*
2702	* @remarks x86: Requires a Pentium or later.
2703	*/
2704	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
2705	DECLASM(uint64_t) ASMAtomicAddU64(uint64_t volatile *pu64, uint64_t u64);
2706	#else
2707	DECLINLINE(uint64_t) ASMAtomicAddU64(uint64_t volatile *pu64, uint64_t u64)
2708	{
2709	# if RT_INLINE_ASM_USES_INTRIN && defined(RT_ARCH_AMD64)
2710	u64 = _InterlockedExchangeAdd64((__int64 *)pu64, u64);
2711	return u64;
2712
2713	# elif RT_INLINE_ASM_GNU_STYLE && defined(RT_ARCH_AMD64)
2714	__asm__ __volatile__("lock; xaddq %0, %1\n\t"
2715	: "=r" (u64),
2716	"=m" (*pu64)
2717	: "0" (u64),
2718	"m" (*pu64)
2719	: "memory");
2720	return u64;
2721	# else
2722	uint64_t u64Old;
2723	for (;;)
2724	{
2725	uint64_t u64New;
2726	u64Old = ASMAtomicUoReadU64(pu64);
2727	u64New = u64Old + u64;
2728	if (ASMAtomicCmpXchgU64(pu64, u64New, u64Old))
2729	break;
2730	ASMNopPause();
2731	}
2732	return u64Old;
2733	# endif
2734	}
2735	#endif
2736
2737
2738	/**
2739	* Atomically exchanges and adds to a signed 64-bit value, ordered.
2740	*
2741	* @returns The old value.
2742	* @param pi64 Pointer to the value.
2743	* @param i64 Number to add.
2744	*
2745	* @remarks x86: Requires a Pentium or later.
2746	*/
2747	DECLINLINE(int64_t) ASMAtomicAddS64(int64_t volatile *pi64, int64_t i64)
2748	{
2749	return (int64_t)ASMAtomicAddU64((uint64_t volatile *)pi64, (uint64_t)i64);
2750	}
2751
2752
2753	/**
2754	* Atomically exchanges and adds to a size_t value, ordered.
2755	*
2756	* @returns The old value.
2757	* @param pcb Pointer to the size_t value.
2758	* @param cb Number to add.
2759	*/
2760	DECLINLINE(size_t) ASMAtomicAddZ(size_t volatile *pcb, size_t cb)
2761	{
2762	#if ARCH_BITS == 64
2763	AssertCompileSize(size_t, 8);
2764	return ASMAtomicAddU64((uint64_t volatile *)pcb, cb);
2765	#elif ARCH_BITS == 32
2766	AssertCompileSize(size_t, 4);
2767	return ASMAtomicAddU32((uint32_t volatile *)pcb, cb);
2768	#elif ARCH_BITS == 16
2769	AssertCompileSize(size_t, 2);
2770	return ASMAtomicAddU16((uint16_t volatile *)pcb, cb);
2771	#else
2772	# error "Unsupported ARCH_BITS value"
2773	#endif
2774	}
2775
2776
2777	/**
2778	* Atomically exchanges and adds a value which size might differ between
2779	* platforms or compilers, ordered.
2780	*
2781	* @param pu Pointer to the variable to update.
2782	* @param uNew The value to add to *pu.
2783	* @param puOld Where to store the old value.
2784	*/
2785	#define ASMAtomicAddSize(pu, uNew, puOld) \
2786	do { \
2787	switch (sizeof(*(pu))) { \
2788	case 4: (uint32_t )(puOld) = ASMAtomicAddU32((volatile uint32_t )(void )(pu), (uint32_t)(uNew)); break; \
2789	case 8: (uint64_t )(puOld) = ASMAtomicAddU64((volatile uint64_t )(void )(pu), (uint64_t)(uNew)); break; \
2790	default: AssertMsgFailed(("ASMAtomicAddSize: size %d is not supported\n", sizeof(*(pu)))); \
2791	} \
2792	} while (0)
2793
2794
2795
2796	/**
2797	* Atomically exchanges and subtracts to an unsigned 16-bit value, ordered.
2798	*
2799	* @returns The old value.
2800	* @param pu16 Pointer to the value.
2801	* @param u16 Number to subtract.
2802	*
2803	* @remarks x86: Requires a 486 or later.
2804	*/
2805	DECLINLINE(uint16_t) ASMAtomicSubU16(uint16_t volatile *pu16, uint32_t u16)
2806	{
2807	return ASMAtomicAddU16(pu16, (uint16_t)-(int16_t)u16);
2808	}
2809
2810
2811	/**
2812	* Atomically exchanges and subtracts to a signed 16-bit value, ordered.
2813	*
2814	* @returns The old value.
2815	* @param pi16 Pointer to the value.
2816	* @param i16 Number to subtract.
2817	*
2818	* @remarks x86: Requires a 486 or later.
2819	*/
2820	DECLINLINE(int16_t) ASMAtomicSubS16(int16_t volatile *pi16, int16_t i16)
2821	{
2822	return (int16_t)ASMAtomicAddU16((uint16_t volatile *)pi16, (uint16_t)-i16);
2823	}
2824
2825
2826	/**
2827	* Atomically exchanges and subtracts to an unsigned 32-bit value, ordered.
2828	*
2829	* @returns The old value.
2830	* @param pu32 Pointer to the value.
2831	* @param u32 Number to subtract.
2832	*
2833	* @remarks x86: Requires a 486 or later.
2834	*/
2835	DECLINLINE(uint32_t) ASMAtomicSubU32(uint32_t volatile *pu32, uint32_t u32)
2836	{
2837	return ASMAtomicAddU32(pu32, (uint32_t)-(int32_t)u32);
2838	}
2839
2840
2841	/**
2842	* Atomically exchanges and subtracts to a signed 32-bit value, ordered.
2843	*
2844	* @returns The old value.
2845	* @param pi32 Pointer to the value.
2846	* @param i32 Number to subtract.
2847	*
2848	* @remarks x86: Requires a 486 or later.
2849	*/
2850	DECLINLINE(int32_t) ASMAtomicSubS32(int32_t volatile *pi32, int32_t i32)
2851	{
2852	return (int32_t)ASMAtomicAddU32((uint32_t volatile *)pi32, (uint32_t)-i32);
2853	}
2854
2855
2856	/**
2857	* Atomically exchanges and subtracts to an unsigned 64-bit value, ordered.
2858	*
2859	* @returns The old value.
2860	* @param pu64 Pointer to the value.
2861	* @param u64 Number to subtract.
2862	*
2863	* @remarks x86: Requires a Pentium or later.
2864	*/
2865	DECLINLINE(uint64_t) ASMAtomicSubU64(uint64_t volatile *pu64, uint64_t u64)
2866	{
2867	return ASMAtomicAddU64(pu64, (uint64_t)-(int64_t)u64);
2868	}
2869
2870
2871	/**
2872	* Atomically exchanges and subtracts to a signed 64-bit value, ordered.
2873	*
2874	* @returns The old value.
2875	* @param pi64 Pointer to the value.
2876	* @param i64 Number to subtract.
2877	*
2878	* @remarks x86: Requires a Pentium or later.
2879	*/
2880	DECLINLINE(int64_t) ASMAtomicSubS64(int64_t volatile *pi64, int64_t i64)
2881	{
2882	return (int64_t)ASMAtomicAddU64((uint64_t volatile *)pi64, (uint64_t)-i64);
2883	}
2884
2885
2886	/**
2887	* Atomically exchanges and subtracts to a size_t value, ordered.
2888	*
2889	* @returns The old value.
2890	* @param pcb Pointer to the size_t value.
2891	* @param cb Number to subtract.
2892	*
2893	* @remarks x86: Requires a 486 or later.
2894	*/
2895	DECLINLINE(size_t) ASMAtomicSubZ(size_t volatile *pcb, size_t cb)
2896	{
2897	#if ARCH_BITS == 64
2898	return ASMAtomicSubU64((uint64_t volatile *)pcb, cb);
2899	#elif ARCH_BITS == 32
2900	return ASMAtomicSubU32((uint32_t volatile *)pcb, cb);
2901	#elif ARCH_BITS == 16
2902	AssertCompileSize(size_t, 2);
2903	return ASMAtomicSubU16((uint16_t volatile *)pcb, cb);
2904	#else
2905	# error "Unsupported ARCH_BITS value"
2906	#endif
2907	}
2908
2909
2910	/**
2911	* Atomically exchanges and subtracts a value which size might differ between
2912	* platforms or compilers, ordered.
2913	*
2914	* @param pu Pointer to the variable to update.
2915	* @param uNew The value to subtract to *pu.
2916	* @param puOld Where to store the old value.
2917	*
2918	* @remarks x86: Requires a 486 or later.
2919	*/
2920	#define ASMAtomicSubSize(pu, uNew, puOld) \
2921	do { \
2922	switch (sizeof(*(pu))) { \
2923	case 4: (uint32_t )(puOld) = ASMAtomicSubU32((volatile uint32_t )(void )(pu), (uint32_t)(uNew)); break; \
2924	case 8: (uint64_t )(puOld) = ASMAtomicSubU64((volatile uint64_t )(void )(pu), (uint64_t)(uNew)); break; \
2925	default: AssertMsgFailed(("ASMAtomicSubSize: size %d is not supported\n", sizeof(*(pu)))); \
2926	} \
2927	} while (0)
2928
2929
2930
2931	/**
2932	* Atomically increment a 16-bit value, ordered.
2933	*
2934	* @returns The new value.
2935	* @param pu16 Pointer to the value to increment.
2936	* @remarks Not implemented. Just to make 16-bit code happy.
2937	*
2938	* @remarks x86: Requires a 486 or later.
2939	*/
2940	DECLASM(uint16_t) ASMAtomicIncU16(uint16_t volatile *pu16);
2941
2942
2943	/**
2944	* Atomically increment a 32-bit value, ordered.
2945	*
2946	* @returns The new value.
2947	* @param pu32 Pointer to the value to increment.
2948	*
2949	* @remarks x86: Requires a 486 or later.
2950	*/
2951	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
2952	DECLASM(uint32_t) ASMAtomicIncU32(uint32_t volatile *pu32);
2953	#else
2954	DECLINLINE(uint32_t) ASMAtomicIncU32(uint32_t volatile *pu32)
2955	{
2956	uint32_t u32;
2957	# if RT_INLINE_ASM_USES_INTRIN
2958	u32 = _InterlockedIncrement((long *)pu32);
2959	return u32;
2960
2961	# elif RT_INLINE_ASM_GNU_STYLE
2962	__asm__ __volatile__("lock; xaddl %0, %1\n\t"
2963	: "=r" (u32),
2964	"=m" (*pu32)
2965	: "0" (1),
2966	"m" (*pu32)
2967	: "memory");
2968	return u32+1;
2969	# else
2970	__asm
2971	{
2972	mov eax, 1
2973	# ifdef RT_ARCH_AMD64
2974	mov rdx, [pu32]
2975	lock xadd [rdx], eax
2976	# else
2977	mov edx, [pu32]
2978	lock xadd [edx], eax
2979	# endif
2980	mov u32, eax
2981	}
2982	return u32+1;
2983	# endif
2984	}
2985	#endif
2986
2987
2988	/**
2989	* Atomically increment a signed 32-bit value, ordered.
2990	*
2991	* @returns The new value.
2992	* @param pi32 Pointer to the value to increment.
2993	*
2994	* @remarks x86: Requires a 486 or later.
2995	*/
2996	DECLINLINE(int32_t) ASMAtomicIncS32(int32_t volatile *pi32)
2997	{
2998	return (int32_t)ASMAtomicIncU32((uint32_t volatile *)pi32);
2999	}
3000
3001
3002	/**
3003	* Atomically increment a 64-bit value, ordered.
3004	*
3005	* @returns The new value.
3006	* @param pu64 Pointer to the value to increment.
3007	*
3008	* @remarks x86: Requires a Pentium or later.
3009	*/
3010	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
3011	DECLASM(uint64_t) ASMAtomicIncU64(uint64_t volatile *pu64);
3012	#else
3013	DECLINLINE(uint64_t) ASMAtomicIncU64(uint64_t volatile *pu64)
3014	{
3015	# if RT_INLINE_ASM_USES_INTRIN && defined(RT_ARCH_AMD64)
3016	uint64_t u64;
3017	u64 = _InterlockedIncrement64((__int64 *)pu64);
3018	return u64;
3019
3020	# elif RT_INLINE_ASM_GNU_STYLE && defined(RT_ARCH_AMD64)
3021	uint64_t u64;
3022	__asm__ __volatile__("lock; xaddq %0, %1\n\t"
3023	: "=r" (u64),
3024	"=m" (*pu64)
3025	: "0" (1),
3026	"m" (*pu64)
3027	: "memory");
3028	return u64 + 1;
3029	# else
3030	return ASMAtomicAddU64(pu64, 1) + 1;
3031	# endif
3032	}
3033	#endif
3034
3035
3036	/**
3037	* Atomically increment a signed 64-bit value, ordered.
3038	*
3039	* @returns The new value.
3040	* @param pi64 Pointer to the value to increment.
3041	*
3042	* @remarks x86: Requires a Pentium or later.
3043	*/
3044	DECLINLINE(int64_t) ASMAtomicIncS64(int64_t volatile *pi64)
3045	{
3046	return (int64_t)ASMAtomicIncU64((uint64_t volatile *)pi64);
3047	}
3048
3049
3050	/**
3051	* Atomically increment a size_t value, ordered.
3052	*
3053	* @returns The new value.
3054	* @param pcb Pointer to the value to increment.
3055	*
3056	* @remarks x86: Requires a 486 or later.
3057	*/
3058	DECLINLINE(int64_t) ASMAtomicIncZ(size_t volatile *pcb)
3059	{
3060	#if ARCH_BITS == 64
3061	return ASMAtomicIncU64((uint64_t volatile *)pcb);
3062	#elif ARCH_BITS == 32
3063	return ASMAtomicIncU32((uint32_t volatile *)pcb);
3064	#elif ARCH_BITS == 16
3065	return ASMAtomicIncU16((uint16_t volatile *)pcb);
3066	#else
3067	# error "Unsupported ARCH_BITS value"
3068	#endif
3069	}
3070
3071
3072
3073	/**
3074	* Atomically decrement an unsigned 32-bit value, ordered.
3075	*
3076	* @returns The new value.
3077	* @param pu16 Pointer to the value to decrement.
3078	* @remarks Not implemented. Just to make 16-bit code happy.
3079	*
3080	* @remarks x86: Requires a 486 or later.
3081	*/
3082	DECLASM(uint32_t) ASMAtomicDecU16(uint16_t volatile *pu16);
3083
3084
3085	/**
3086	* Atomically decrement an unsigned 32-bit value, ordered.
3087	*
3088	* @returns The new value.
3089	* @param pu32 Pointer to the value to decrement.
3090	*
3091	* @remarks x86: Requires a 486 or later.
3092	*/
3093	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
3094	DECLASM(uint32_t) ASMAtomicDecU32(uint32_t volatile *pu32);
3095	#else
3096	DECLINLINE(uint32_t) ASMAtomicDecU32(uint32_t volatile *pu32)
3097	{
3098	uint32_t u32;
3099	# if RT_INLINE_ASM_USES_INTRIN
3100	u32 = _InterlockedDecrement((long *)pu32);
3101	return u32;
3102
3103	# elif RT_INLINE_ASM_GNU_STYLE
3104	__asm__ __volatile__("lock; xaddl %0, %1\n\t"
3105	: "=r" (u32),
3106	"=m" (*pu32)
3107	: "0" (-1),
3108	"m" (*pu32)
3109	: "memory");
3110	return u32-1;
3111	# else
3112	__asm
3113	{
3114	mov eax, -1
3115	# ifdef RT_ARCH_AMD64
3116	mov rdx, [pu32]
3117	lock xadd [rdx], eax
3118	# else
3119	mov edx, [pu32]
3120	lock xadd [edx], eax
3121	# endif
3122	mov u32, eax
3123	}
3124	return u32-1;
3125	# endif
3126	}
3127	#endif
3128
3129
3130	/**
3131	* Atomically decrement a signed 32-bit value, ordered.
3132	*
3133	* @returns The new value.
3134	* @param pi32 Pointer to the value to decrement.
3135	*
3136	* @remarks x86: Requires a 486 or later.
3137	*/
3138	DECLINLINE(int32_t) ASMAtomicDecS32(int32_t volatile *pi32)
3139	{
3140	return (int32_t)ASMAtomicDecU32((uint32_t volatile *)pi32);
3141	}
3142
3143
3144	/**
3145	* Atomically decrement an unsigned 64-bit value, ordered.
3146	*
3147	* @returns The new value.
3148	* @param pu64 Pointer to the value to decrement.
3149	*
3150	* @remarks x86: Requires a Pentium or later.
3151	*/
3152	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
3153	DECLASM(uint64_t) ASMAtomicDecU64(uint64_t volatile *pu64);
3154	#else
3155	DECLINLINE(uint64_t) ASMAtomicDecU64(uint64_t volatile *pu64)
3156	{
3157	# if RT_INLINE_ASM_USES_INTRIN && defined(RT_ARCH_AMD64)
3158	uint64_t u64 = _InterlockedDecrement64((__int64 volatile *)pu64);
3159	return u64;
3160
3161	# elif RT_INLINE_ASM_GNU_STYLE && defined(RT_ARCH_AMD64)
3162	uint64_t u64;
3163	__asm__ __volatile__("lock; xaddq %q0, %1\n\t"
3164	: "=r" (u64),
3165	"=m" (*pu64)
3166	: "0" (~(uint64_t)0),
3167	"m" (*pu64)
3168	: "memory");
3169	return u64-1;
3170	# else
3171	return ASMAtomicAddU64(pu64, UINT64_MAX) - 1;
3172	# endif
3173	}
3174	#endif
3175
3176
3177	/**
3178	* Atomically decrement a signed 64-bit value, ordered.
3179	*
3180	* @returns The new value.
3181	* @param pi64 Pointer to the value to decrement.
3182	*
3183	* @remarks x86: Requires a Pentium or later.
3184	*/
3185	DECLINLINE(int64_t) ASMAtomicDecS64(int64_t volatile *pi64)
3186	{
3187	return (int64_t)ASMAtomicDecU64((uint64_t volatile *)pi64);
3188	}
3189
3190
3191	/**
3192	* Atomically decrement a size_t value, ordered.
3193	*
3194	* @returns The new value.
3195	* @param pcb Pointer to the value to decrement.
3196	*
3197	* @remarks x86: Requires a 486 or later.
3198	*/
3199	DECLINLINE(int64_t) ASMAtomicDecZ(size_t volatile *pcb)
3200	{
3201	#if ARCH_BITS == 64
3202	return ASMAtomicDecU64((uint64_t volatile *)pcb);
3203	#elif ARCH_BITS == 32
3204	return ASMAtomicDecU32((uint32_t volatile *)pcb);
3205	#elif ARCH_BITS == 16
3206	return ASMAtomicDecU16((uint16_t volatile *)pcb);
3207	#else
3208	# error "Unsupported ARCH_BITS value"
3209	#endif
3210	}
3211
3212
3213	/**
3214	* Atomically Or an unsigned 32-bit value, ordered.
3215	*
3216	* @param pu32 Pointer to the pointer variable to OR u32 with.
3217	* @param u32 The value to OR *pu32 with.
3218	*
3219	* @remarks x86: Requires a 386 or later.
3220	*/
3221	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
3222	DECLASM(void) ASMAtomicOrU32(uint32_t volatile *pu32, uint32_t u32);
3223	#else
3224	DECLINLINE(void) ASMAtomicOrU32(uint32_t volatile *pu32, uint32_t u32)
3225	{
3226	# if RT_INLINE_ASM_USES_INTRIN
3227	_InterlockedOr((long volatile *)pu32, (long)u32);
3228
3229	# elif RT_INLINE_ASM_GNU_STYLE
3230	__asm__ __volatile__("lock; orl %1, %0\n\t"
3231	: "=m" (*pu32)
3232	: "ir" (u32),
3233	"m" (*pu32));
3234	# else
3235	__asm
3236	{
3237	mov eax, [u32]
3238	# ifdef RT_ARCH_AMD64
3239	mov rdx, [pu32]
3240	lock or [rdx], eax
3241	# else
3242	mov edx, [pu32]
3243	lock or [edx], eax
3244	# endif
3245	}
3246	# endif
3247	}
3248	#endif
3249
3250
3251	/**
3252	* Atomically Or a signed 32-bit value, ordered.
3253	*
3254	* @param pi32 Pointer to the pointer variable to OR u32 with.
3255	* @param i32 The value to OR *pu32 with.
3256	*
3257	* @remarks x86: Requires a 386 or later.
3258	*/
3259	DECLINLINE(void) ASMAtomicOrS32(int32_t volatile *pi32, int32_t i32)
3260	{
3261	ASMAtomicOrU32((uint32_t volatile *)pi32, i32);
3262	}
3263
3264
3265	/**
3266	* Atomically Or an unsigned 64-bit value, ordered.
3267	*
3268	* @param pu64 Pointer to the pointer variable to OR u64 with.
3269	* @param u64 The value to OR *pu64 with.
3270	*
3271	* @remarks x86: Requires a Pentium or later.
3272	*/
3273	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
3274	DECLASM(void) ASMAtomicOrU64(uint64_t volatile *pu64, uint64_t u64);
3275	#else
3276	DECLINLINE(void) ASMAtomicOrU64(uint64_t volatile *pu64, uint64_t u64)
3277	{
3278	# if RT_INLINE_ASM_USES_INTRIN && defined(RT_ARCH_AMD64)
3279	_InterlockedOr64((__int64 volatile *)pu64, (__int64)u64);
3280
3281	# elif RT_INLINE_ASM_GNU_STYLE && defined(RT_ARCH_AMD64)
3282	__asm__ __volatile__("lock; orq %1, %q0\n\t"
3283	: "=m" (*pu64)
3284	: "r" (u64),
3285	"m" (*pu64));
3286	# else
3287	for (;;)
3288	{
3289	uint64_t u64Old = ASMAtomicUoReadU64(pu64);
3290	uint64_t u64New = u64Old \| u64;
3291	if (ASMAtomicCmpXchgU64(pu64, u64New, u64Old))
3292	break;
3293	ASMNopPause();
3294	}
3295	# endif
3296	}
3297	#endif
3298
3299
3300	/**
3301	* Atomically Or a signed 64-bit value, ordered.
3302	*
3303	* @param pi64 Pointer to the pointer variable to OR u64 with.
3304	* @param i64 The value to OR *pu64 with.
3305	*
3306	* @remarks x86: Requires a Pentium or later.
3307	*/
3308	DECLINLINE(void) ASMAtomicOrS64(int64_t volatile *pi64, int64_t i64)
3309	{
3310	ASMAtomicOrU64((uint64_t volatile *)pi64, i64);
3311	}
3312
3313
3314	/**
3315	* Atomically And an unsigned 32-bit value, ordered.
3316	*
3317	* @param pu32 Pointer to the pointer variable to AND u32 with.
3318	* @param u32 The value to AND *pu32 with.
3319	*
3320	* @remarks x86: Requires a 386 or later.
3321	*/
3322	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
3323	DECLASM(void) ASMAtomicAndU32(uint32_t volatile *pu32, uint32_t u32);
3324	#else
3325	DECLINLINE(void) ASMAtomicAndU32(uint32_t volatile *pu32, uint32_t u32)
3326	{
3327	# if RT_INLINE_ASM_USES_INTRIN
3328	_InterlockedAnd((long volatile *)pu32, u32);
3329
3330	# elif RT_INLINE_ASM_GNU_STYLE
3331	__asm__ __volatile__("lock; andl %1, %0\n\t"
3332	: "=m" (*pu32)
3333	: "ir" (u32),
3334	"m" (*pu32));
3335	# else
3336	__asm
3337	{
3338	mov eax, [u32]
3339	# ifdef RT_ARCH_AMD64
3340	mov rdx, [pu32]
3341	lock and [rdx], eax
3342	# else
3343	mov edx, [pu32]
3344	lock and [edx], eax
3345	# endif
3346	}
3347	# endif
3348	}
3349	#endif
3350
3351
3352	/**
3353	* Atomically And a signed 32-bit value, ordered.
3354	*
3355	* @param pi32 Pointer to the pointer variable to AND i32 with.
3356	* @param i32 The value to AND *pi32 with.
3357	*
3358	* @remarks x86: Requires a 386 or later.
3359	*/
3360	DECLINLINE(void) ASMAtomicAndS32(int32_t volatile *pi32, int32_t i32)
3361	{
3362	ASMAtomicAndU32((uint32_t volatile *)pi32, (uint32_t)i32);
3363	}
3364
3365
3366	/**
3367	* Atomically And an unsigned 64-bit value, ordered.
3368	*
3369	* @param pu64 Pointer to the pointer variable to AND u64 with.
3370	* @param u64 The value to AND *pu64 with.
3371	*
3372	* @remarks x86: Requires a Pentium or later.
3373	*/
3374	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
3375	DECLASM(void) ASMAtomicAndU64(uint64_t volatile *pu64, uint64_t u64);
3376	#else
3377	DECLINLINE(void) ASMAtomicAndU64(uint64_t volatile *pu64, uint64_t u64)
3378	{
3379	# if RT_INLINE_ASM_USES_INTRIN && defined(RT_ARCH_AMD64)
3380	_InterlockedAnd64((__int64 volatile *)pu64, u64);
3381
3382	# elif RT_INLINE_ASM_GNU_STYLE && defined(RT_ARCH_AMD64)
3383	__asm__ __volatile__("lock; andq %1, %0\n\t"
3384	: "=m" (*pu64)
3385	: "r" (u64),
3386	"m" (*pu64));
3387	# else
3388	for (;;)
3389	{
3390	uint64_t u64Old = ASMAtomicUoReadU64(pu64);
3391	uint64_t u64New = u64Old & u64;
3392	if (ASMAtomicCmpXchgU64(pu64, u64New, u64Old))
3393	break;
3394	ASMNopPause();
3395	}
3396	# endif
3397	}
3398	#endif
3399
3400
3401	/**
3402	* Atomically And a signed 64-bit value, ordered.
3403	*
3404	* @param pi64 Pointer to the pointer variable to AND i64 with.
3405	* @param i64 The value to AND *pi64 with.
3406	*
3407	* @remarks x86: Requires a Pentium or later.
3408	*/
3409	DECLINLINE(void) ASMAtomicAndS64(int64_t volatile *pi64, int64_t i64)
3410	{
3411	ASMAtomicAndU64((uint64_t volatile *)pi64, (uint64_t)i64);
3412	}
3413
3414
3415	/**
3416	* Atomically OR an unsigned 32-bit value, unordered but interrupt safe.
3417	*
3418	* @param pu32 Pointer to the pointer variable to OR u32 with.
3419	* @param u32 The value to OR *pu32 with.
3420	*
3421	* @remarks x86: Requires a 386 or later.
3422	*/
3423	#if RT_INLINE_ASM_EXTERNAL
3424	DECLASM(void) ASMAtomicUoOrU32(uint32_t volatile *pu32, uint32_t u32);
3425	#else
3426	DECLINLINE(void) ASMAtomicUoOrU32(uint32_t volatile *pu32, uint32_t u32)
3427	{
3428	# if RT_INLINE_ASM_GNU_STYLE
3429	__asm__ __volatile__("orl %1, %0\n\t"
3430	: "=m" (*pu32)
3431	: "ir" (u32),
3432	"m" (*pu32));
3433	# else
3434	__asm
3435	{
3436	mov eax, [u32]
3437	# ifdef RT_ARCH_AMD64
3438	mov rdx, [pu32]
3439	or [rdx], eax
3440	# else
3441	mov edx, [pu32]
3442	or [edx], eax
3443	# endif
3444	}
3445	# endif
3446	}
3447	#endif
3448
3449
3450	/**
3451	* Atomically OR a signed 32-bit value, unordered.
3452	*
3453	* @param pi32 Pointer to the pointer variable to OR u32 with.
3454	* @param i32 The value to OR *pu32 with.
3455	*
3456	* @remarks x86: Requires a 386 or later.
3457	*/
3458	DECLINLINE(void) ASMAtomicUoOrS32(int32_t volatile *pi32, int32_t i32)
3459	{
3460	ASMAtomicUoOrU32((uint32_t volatile *)pi32, i32);
3461	}
3462
3463
3464	/**
3465	* Atomically OR an unsigned 64-bit value, unordered.
3466	*
3467	* @param pu64 Pointer to the pointer variable to OR u64 with.
3468	* @param u64 The value to OR *pu64 with.
3469	*
3470	* @remarks x86: Requires a Pentium or later.
3471	*/
3472	#if RT_INLINE_ASM_EXTERNAL
3473	DECLASM(void) ASMAtomicUoOrU64(uint64_t volatile *pu64, uint64_t u64);
3474	#else
3475	DECLINLINE(void) ASMAtomicUoOrU64(uint64_t volatile *pu64, uint64_t u64)
3476	{
3477	# if RT_INLINE_ASM_GNU_STYLE && defined(RT_ARCH_AMD64)
3478	__asm__ __volatile__("orq %1, %q0\n\t"
3479	: "=m" (*pu64)
3480	: "r" (u64),
3481	"m" (*pu64));
3482	# else
3483	for (;;)
3484	{
3485	uint64_t u64Old = ASMAtomicUoReadU64(pu64);
3486	uint64_t u64New = u64Old \| u64;
3487	if (ASMAtomicCmpXchgU64(pu64, u64New, u64Old))
3488	break;
3489	ASMNopPause();
3490	}
3491	# endif
3492	}
3493	#endif
3494
3495
3496	/**
3497	* Atomically Or a signed 64-bit value, unordered.
3498	*
3499	* @param pi64 Pointer to the pointer variable to OR u64 with.
3500	* @param i64 The value to OR *pu64 with.
3501	*
3502	* @remarks x86: Requires a Pentium or later.
3503	*/
3504	DECLINLINE(void) ASMAtomicUoOrS64(int64_t volatile *pi64, int64_t i64)
3505	{
3506	ASMAtomicUoOrU64((uint64_t volatile *)pi64, i64);
3507	}
3508
3509
3510	/**
3511	* Atomically And an unsigned 32-bit value, unordered.
3512	*
3513	* @param pu32 Pointer to the pointer variable to AND u32 with.
3514	* @param u32 The value to AND *pu32 with.
3515	*
3516	* @remarks x86: Requires a 386 or later.
3517	*/
3518	#if RT_INLINE_ASM_EXTERNAL
3519	DECLASM(void) ASMAtomicUoAndU32(uint32_t volatile *pu32, uint32_t u32);
3520	#else
3521	DECLINLINE(void) ASMAtomicUoAndU32(uint32_t volatile *pu32, uint32_t u32)
3522	{
3523	# if RT_INLINE_ASM_GNU_STYLE
3524	__asm__ __volatile__("andl %1, %0\n\t"
3525	: "=m" (*pu32)
3526	: "ir" (u32),
3527	"m" (*pu32));
3528	# else
3529	__asm
3530	{
3531	mov eax, [u32]
3532	# ifdef RT_ARCH_AMD64
3533	mov rdx, [pu32]
3534	and [rdx], eax
3535	# else
3536	mov edx, [pu32]
3537	and [edx], eax
3538	# endif
3539	}
3540	# endif
3541	}
3542	#endif
3543
3544
3545	/**
3546	* Atomically And a signed 32-bit value, unordered.
3547	*
3548	* @param pi32 Pointer to the pointer variable to AND i32 with.
3549	* @param i32 The value to AND *pi32 with.
3550	*
3551	* @remarks x86: Requires a 386 or later.
3552	*/
3553	DECLINLINE(void) ASMAtomicUoAndS32(int32_t volatile *pi32, int32_t i32)
3554	{
3555	ASMAtomicUoAndU32((uint32_t volatile *)pi32, (uint32_t)i32);
3556	}
3557
3558
3559	/**
3560	* Atomically And an unsigned 64-bit value, unordered.
3561	*
3562	* @param pu64 Pointer to the pointer variable to AND u64 with.
3563	* @param u64 The value to AND *pu64 with.
3564	*
3565	* @remarks x86: Requires a Pentium or later.
3566	*/
3567	#if RT_INLINE_ASM_EXTERNAL
3568	DECLASM(void) ASMAtomicUoAndU64(uint64_t volatile *pu64, uint64_t u64);
3569	#else
3570	DECLINLINE(void) ASMAtomicUoAndU64(uint64_t volatile *pu64, uint64_t u64)
3571	{
3572	# if RT_INLINE_ASM_GNU_STYLE && defined(RT_ARCH_AMD64)
3573	__asm__ __volatile__("andq %1, %0\n\t"
3574	: "=m" (*pu64)
3575	: "r" (u64),
3576	"m" (*pu64));
3577	# else
3578	for (;;)
3579	{
3580	uint64_t u64Old = ASMAtomicUoReadU64(pu64);
3581	uint64_t u64New = u64Old & u64;
3582	if (ASMAtomicCmpXchgU64(pu64, u64New, u64Old))
3583	break;
3584	ASMNopPause();
3585	}
3586	# endif
3587	}
3588	#endif
3589
3590
3591	/**
3592	* Atomically And a signed 64-bit value, unordered.
3593	*
3594	* @param pi64 Pointer to the pointer variable to AND i64 with.
3595	* @param i64 The value to AND *pi64 with.
3596	*
3597	* @remarks x86: Requires a Pentium or later.
3598	*/
3599	DECLINLINE(void) ASMAtomicUoAndS64(int64_t volatile *pi64, int64_t i64)
3600	{
3601	ASMAtomicUoAndU64((uint64_t volatile *)pi64, (uint64_t)i64);
3602	}
3603
3604
3605	/**
3606	* Atomically increment an unsigned 32-bit value, unordered.
3607	*
3608	* @returns the new value.
3609	* @param pu32 Pointer to the variable to increment.
3610	*
3611	* @remarks x86: Requires a 486 or later.
3612	*/
3613	#if RT_INLINE_ASM_EXTERNAL
3614	DECLASM(uint32_t) ASMAtomicUoIncU32(uint32_t volatile *pu32);
3615	#else
3616	DECLINLINE(uint32_t) ASMAtomicUoIncU32(uint32_t volatile *pu32)
3617	{
3618	uint32_t u32;
3619	# if RT_INLINE_ASM_GNU_STYLE
3620	__asm__ __volatile__("xaddl %0, %1\n\t"
3621	: "=r" (u32),
3622	"=m" (*pu32)
3623	: "0" (1),
3624	"m" (*pu32)
3625	: "memory");
3626	return u32 + 1;
3627	# else
3628	__asm
3629	{
3630	mov eax, 1
3631	# ifdef RT_ARCH_AMD64
3632	mov rdx, [pu32]
3633	xadd [rdx], eax
3634	# else
3635	mov edx, [pu32]
3636	xadd [edx], eax
3637	# endif
3638	mov u32, eax
3639	}
3640	return u32 + 1;
3641	# endif
3642	}
3643	#endif
3644
3645
3646	/**
3647	* Atomically decrement an unsigned 32-bit value, unordered.
3648	*
3649	* @returns the new value.
3650	* @param pu32 Pointer to the variable to decrement.
3651	*
3652	* @remarks x86: Requires a 486 or later.
3653	*/
3654	#if RT_INLINE_ASM_EXTERNAL
3655	DECLASM(uint32_t) ASMAtomicUoDecU32(uint32_t volatile *pu32);
3656	#else
3657	DECLINLINE(uint32_t) ASMAtomicUoDecU32(uint32_t volatile *pu32)
3658	{
3659	uint32_t u32;
3660	# if RT_INLINE_ASM_GNU_STYLE
3661	__asm__ __volatile__("lock; xaddl %0, %1\n\t"
3662	: "=r" (u32),
3663	"=m" (*pu32)
3664	: "0" (-1),
3665	"m" (*pu32)
3666	: "memory");
3667	return u32 - 1;
3668	# else
3669	__asm
3670	{
3671	mov eax, -1
3672	# ifdef RT_ARCH_AMD64
3673	mov rdx, [pu32]
3674	xadd [rdx], eax
3675	# else
3676	mov edx, [pu32]
3677	xadd [edx], eax
3678	# endif
3679	mov u32, eax
3680	}
3681	return u32 - 1;
3682	# endif
3683	}
3684	#endif
3685
3686
3687	/** @def RT_ASM_PAGE_SIZE
3688	* We try avoid dragging in iprt/param.h here.
3689	* @internal
3690	*/
3691	#if defined(RT_ARCH_SPARC64)
3692	# define RT_ASM_PAGE_SIZE 0x2000
3693	# if defined(PAGE_SIZE) && !defined(NT_INCLUDED)
3694	# if PAGE_SIZE != 0x2000
3695	# error "PAGE_SIZE is not 0x2000!"
3696	# endif
3697	# endif
3698	#else
3699	# define RT_ASM_PAGE_SIZE 0x1000
3700	# if defined(PAGE_SIZE) && !defined(NT_INCLUDED)
3701	# if PAGE_SIZE != 0x1000
3702	# error "PAGE_SIZE is not 0x1000!"
3703	# endif
3704	# endif
3705	#endif
3706
3707	/**
3708	* Zeros a 4K memory page.
3709	*
3710	* @param pv Pointer to the memory block. This must be page aligned.
3711	*/
3712	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
3713	DECLASM(void) ASMMemZeroPage(volatile void *pv);
3714	# else
3715	DECLINLINE(void) ASMMemZeroPage(volatile void *pv)
3716	{
3717	# if RT_INLINE_ASM_USES_INTRIN
3718	# ifdef RT_ARCH_AMD64
3719	__stosq((unsigned __int64 *)pv, 0, RT_ASM_PAGE_SIZE / 8);
3720	# else
3721	__stosd((unsigned long *)pv, 0, RT_ASM_PAGE_SIZE / 4);
3722	# endif
3723
3724	# elif RT_INLINE_ASM_GNU_STYLE
3725	RTCCUINTREG uDummy;
3726	# ifdef RT_ARCH_AMD64
3727	__asm__ __volatile__("rep stosq"
3728	: "=D" (pv),
3729	"=c" (uDummy)
3730	: "0" (pv),
3731	"c" (RT_ASM_PAGE_SIZE >> 3),
3732	"a" (0)
3733	: "memory");
3734	# else
3735	__asm__ __volatile__("rep stosl"
3736	: "=D" (pv),
3737	"=c" (uDummy)
3738	: "0" (pv),
3739	"c" (RT_ASM_PAGE_SIZE >> 2),
3740	"a" (0)
3741	: "memory");
3742	# endif
3743	# else
3744	__asm
3745	{
3746	# ifdef RT_ARCH_AMD64
3747	xor rax, rax
3748	mov ecx, 0200h
3749	mov rdi, [pv]
3750	rep stosq
3751	# else
3752	xor eax, eax
3753	mov ecx, 0400h
3754	mov edi, [pv]
3755	rep stosd
3756	# endif
3757	}
3758	# endif
3759	}
3760	# endif
3761
3762
3763	/**
3764	* Zeros a memory block with a 32-bit aligned size.
3765	*
3766	* @param pv Pointer to the memory block.
3767	* @param cb Number of bytes in the block. This MUST be aligned on 32-bit!
3768	*/
3769	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
3770	DECLASM(void) ASMMemZero32(volatile void *pv, size_t cb);
3771	#else
3772	DECLINLINE(void) ASMMemZero32(volatile void *pv, size_t cb)
3773	{
3774	# if RT_INLINE_ASM_USES_INTRIN
3775	# ifdef RT_ARCH_AMD64
3776	if (!(cb & 7))
3777	__stosq((unsigned __int64 *)pv, 0, cb / 8);
3778	else
3779	# endif
3780	__stosd((unsigned long *)pv, 0, cb / 4);
3781
3782	# elif RT_INLINE_ASM_GNU_STYLE
3783	__asm__ __volatile__("rep stosl"
3784	: "=D" (pv),
3785	"=c" (cb)
3786	: "0" (pv),
3787	"1" (cb >> 2),
3788	"a" (0)
3789	: "memory");
3790	# else
3791	__asm
3792	{
3793	xor eax, eax
3794	# ifdef RT_ARCH_AMD64
3795	mov rcx, [cb]
3796	shr rcx, 2
3797	mov rdi, [pv]
3798	# else
3799	mov ecx, [cb]
3800	shr ecx, 2
3801	mov edi, [pv]
3802	# endif
3803	rep stosd
3804	}
3805	# endif
3806	}
3807	#endif
3808
3809
3810	/**
3811	* Fills a memory block with a 32-bit aligned size.
3812	*
3813	* @param pv Pointer to the memory block.
3814	* @param cb Number of bytes in the block. This MUST be aligned on 32-bit!
3815	* @param u32 The value to fill with.
3816	*/
3817	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
3818	DECLASM(void) ASMMemFill32(volatile void *pv, size_t cb, uint32_t u32);
3819	#else
3820	DECLINLINE(void) ASMMemFill32(volatile void *pv, size_t cb, uint32_t u32)
3821	{
3822	# if RT_INLINE_ASM_USES_INTRIN
3823	# ifdef RT_ARCH_AMD64
3824	if (!(cb & 7))
3825	__stosq((unsigned __int64 *)pv, RT_MAKE_U64(u32, u32), cb / 8);
3826	else
3827	# endif
3828	__stosd((unsigned long *)pv, u32, cb / 4);
3829
3830	# elif RT_INLINE_ASM_GNU_STYLE
3831	__asm__ __volatile__("rep stosl"
3832	: "=D" (pv),
3833	"=c" (cb)
3834	: "0" (pv),
3835	"1" (cb >> 2),
3836	"a" (u32)
3837	: "memory");
3838	# else
3839	__asm
3840	{
3841	# ifdef RT_ARCH_AMD64
3842	mov rcx, [cb]
3843	shr rcx, 2
3844	mov rdi, [pv]
3845	# else
3846	mov ecx, [cb]
3847	shr ecx, 2
3848	mov edi, [pv]
3849	# endif
3850	mov eax, [u32]
3851	rep stosd
3852	}
3853	# endif
3854	}
3855	#endif
3856
3857
3858	/**
3859	* Checks if a memory block is all zeros.
3860	*
3861	* @returns Pointer to the first non-zero byte.
3862	* @returns NULL if all zero.
3863	*
3864	* @param pv Pointer to the memory block.
3865	* @param cb Number of bytes in the block.
3866	*
3867	* @todo Fix name, it is a predicate function but it's not returning boolean!
3868	*/
3869	#if !defined(RT_OS_LINUX) \|\| !defined(__KERNEL__)
3870	DECLASM(void ) ASMMemFirstNonZero(void const pv, size_t cb);
3871	#else
3872	DECLINLINE(void ) ASMMemFirstNonZero(void const pv, size_t cb)
3873	{
3874	uint8_t const pb = (uint8_t const )pv;
3875	for (; cb; cb--, pb++)
3876	if (RT_LIKELY(*pb == 0))
3877	{ /* likely */ }
3878	else
3879	return (void *)pb;
3880	return NULL;
3881	}
3882	#endif
3883
3884
3885	/**
3886	* Checks if a memory block is all zeros.
3887	*
3888	* @returns true if zero, false if not.
3889	*
3890	* @param pv Pointer to the memory block.
3891	* @param cb Number of bytes in the block.
3892	*
3893	* @sa ASMMemFirstNonZero
3894	*/
3895	DECLINLINE(bool) ASMMemIsZero(void const *pv, size_t cb)
3896	{
3897	return ASMMemFirstNonZero(pv, cb) == NULL;
3898	}
3899
3900
3901	/**
3902	* Checks if a memory page is all zeros.
3903	*
3904	* @returns true / false.
3905	*
3906	* @param pvPage Pointer to the page. Must be aligned on 16 byte
3907	* boundary
3908	*/
3909	DECLINLINE(bool) ASMMemIsZeroPage(void const *pvPage)
3910	{
3911	# if 0 /RT_INLINE_ASM_GNU_STYLE - this is actually slower... /
3912	union { RTCCUINTREG r; bool f; } uAX;
3913	RTCCUINTREG xCX, xDI;
3914	Assert(!((uintptr_t)pvPage & 15));
3915	__asm__ __volatile__("repe; "
3916	# ifdef RT_ARCH_AMD64
3917	"scasq\n\t"
3918	# else
3919	"scasl\n\t"
3920	# endif
3921	"setnc %%al\n\t"
3922	: "=&c" (xCX),
3923	"=&D" (xDI),
3924	"=&a" (uAX.r)
3925	: "mr" (pvPage),
3926	# ifdef RT_ARCH_AMD64
3927	"0" (RT_ASM_PAGE_SIZE/8),
3928	# else
3929	"0" (RT_ASM_PAGE_SIZE/4),
3930	# endif
3931	"1" (pvPage),
3932	"2" (0));
3933	return uAX.f;
3934	# else
3935	uintptr_t const puPtr = (uintptr_t const )pvPage;
3936	int cLeft = RT_ASM_PAGE_SIZE / sizeof(uintptr_t) / 8;
3937	Assert(!((uintptr_t)pvPage & 15));
3938	for (;;)
3939	{
3940	if (puPtr[0]) return false;
3941	if (puPtr[4]) return false;
3942
3943	if (puPtr[2]) return false;
3944	if (puPtr[6]) return false;
3945
3946	if (puPtr[1]) return false;
3947	if (puPtr[5]) return false;
3948
3949	if (puPtr[3]) return false;
3950	if (puPtr[7]) return false;
3951
3952	if (!--cLeft)
3953	return true;
3954	puPtr += 8;
3955	}
3956	return true;
3957	# endif
3958	}
3959
3960
3961	/**
3962	* Checks if a memory block is filled with the specified byte, returning the
3963	* first mismatch.
3964	*
3965	* This is sort of an inverted memchr.
3966	*
3967	* @returns Pointer to the byte which doesn't equal u8.
3968	* @returns NULL if all equal to u8.
3969	*
3970	* @param pv Pointer to the memory block.
3971	* @param cb Number of bytes in the block.
3972	* @param u8 The value it's supposed to be filled with.
3973	*
3974	* @remarks No alignment requirements.
3975	*/
3976	#if (!defined(RT_OS_LINUX) \|\| !defined(__KERNEL__)) \
3977	&& (!defined(RT_OS_FREEBSD) \|\| !defined(_KERNEL))
3978	DECLASM(void ) ASMMemFirstMismatchingU8(void const pv, size_t cb, uint8_t u8);
3979	#else
3980	DECLINLINE(void ) ASMMemFirstMismatchingU8(void const pv, size_t cb, uint8_t u8)
3981	{
3982	uint8_t const pb = (uint8_t const )pv;
3983	for (; cb; cb--, pb++)
3984	if (RT_LIKELY(*pb == u8))
3985	{ /* likely */ }
3986	else
3987	return (void *)pb;
3988	return NULL;
3989	}
3990	#endif
3991
3992
3993	/**
3994	* Checks if a memory block is filled with the specified byte.
3995	*
3996	* @returns true if all matching, false if not.
3997	*
3998	* @param pv Pointer to the memory block.
3999	* @param cb Number of bytes in the block.
4000	* @param u8 The value it's supposed to be filled with.
4001	*
4002	* @remarks No alignment requirements.
4003	*/
4004	DECLINLINE(bool) ASMMemIsAllU8(void const *pv, size_t cb, uint8_t u8)
4005	{
4006	return ASMMemFirstMismatchingU8(pv, cb, u8) == NULL;
4007	}
4008
4009
4010	/**
4011	* Checks if a memory block is filled with the specified 32-bit value.
4012	*
4013	* This is a sort of inverted memchr.
4014	*
4015	* @returns Pointer to the first value which doesn't equal u32.
4016	* @returns NULL if all equal to u32.
4017	*
4018	* @param pv Pointer to the memory block.
4019	* @param cb Number of bytes in the block. This MUST be aligned on 32-bit!
4020	* @param u32 The value it's supposed to be filled with.
4021	*/
4022	DECLINLINE(uint32_t ) ASMMemFirstMismatchingU32(void const pv, size_t cb, uint32_t u32)
4023	{
4024	/** @todo rewrite this in inline assembly? */
4025	uint32_t const pu32 = (uint32_t const )pv;
4026	for (; cb; cb -= 4, pu32++)
4027	if (RT_LIKELY(*pu32 == u32))
4028	{ /* likely */ }
4029	else
4030	return (uint32_t *)pu32;
4031	return NULL;
4032	}
4033
4034
4035	/**
4036	* Probes a byte pointer for read access.
4037	*
4038	* While the function will not fault if the byte is not read accessible,
4039	* the idea is to do this in a safe place like before acquiring locks
4040	* and such like.
4041	*
4042	* Also, this functions guarantees that an eager compiler is not going
4043	* to optimize the probing away.
4044	*
4045	* @param pvByte Pointer to the byte.
4046	*/
4047	#if RT_INLINE_ASM_EXTERNAL
4048	DECLASM(uint8_t) ASMProbeReadByte(const void *pvByte);
4049	#else
4050	DECLINLINE(uint8_t) ASMProbeReadByte(const void *pvByte)
4051	{
4052	/** @todo verify that the compiler actually doesn't optimize this away. (intel & gcc) */
4053	uint8_t u8;
4054	# if RT_INLINE_ASM_GNU_STYLE
4055	__asm__ __volatile__("movb (%1), %0\n\t"
4056	: "=r" (u8)
4057	: "r" (pvByte));
4058	# else
4059	__asm
4060	{
4061	# ifdef RT_ARCH_AMD64
4062	mov rax, [pvByte]
4063	mov al, [rax]
4064	# else
4065	mov eax, [pvByte]
4066	mov al, [eax]
4067	# endif
4068	mov [u8], al
4069	}
4070	# endif
4071	return u8;
4072	}
4073	#endif
4074
4075	/**
4076	* Probes a buffer for read access page by page.
4077	*
4078	* While the function will fault if the buffer is not fully read
4079	* accessible, the idea is to do this in a safe place like before
4080	* acquiring locks and such like.
4081	*
4082	* Also, this functions guarantees that an eager compiler is not going
4083	* to optimize the probing away.
4084	*
4085	* @param pvBuf Pointer to the buffer.
4086	* @param cbBuf The size of the buffer in bytes. Must be >= 1.
4087	*/
4088	DECLINLINE(void) ASMProbeReadBuffer(const void *pvBuf, size_t cbBuf)
4089	{
4090	/** @todo verify that the compiler actually doesn't optimize this away. (intel & gcc) */
4091	/* the first byte */
4092	const uint8_t pu8 = (const uint8_t )pvBuf;
4093	ASMProbeReadByte(pu8);
4094
4095	/* the pages in between pages. */
4096	while (cbBuf > RT_ASM_PAGE_SIZE)
4097	{
4098	ASMProbeReadByte(pu8);
4099	cbBuf -= RT_ASM_PAGE_SIZE;
4100	pu8 += RT_ASM_PAGE_SIZE;
4101	}
4102
4103	/* the last byte */
4104	ASMProbeReadByte(pu8 + cbBuf - 1);
4105	}
4106
4107
4108
4109	/** @defgroup grp_inline_bits Bit Operations
4110	* @{
4111	*/
4112
4113
4114	/**
4115	* Sets a bit in a bitmap.
4116	*
4117	* @param pvBitmap Pointer to the bitmap. This should be 32-bit aligned.
4118	* @param iBit The bit to set.
4119	*
4120	* @remarks The 32-bit aligning of pvBitmap is not a strict requirement.
4121	* However, doing so will yield better performance as well as avoiding
4122	* traps accessing the last bits in the bitmap.
4123	*/
4124	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
4125	DECLASM(void) ASMBitSet(volatile void *pvBitmap, int32_t iBit);
4126	#else
4127	DECLINLINE(void) ASMBitSet(volatile void *pvBitmap, int32_t iBit)
4128	{
4129	# if RT_INLINE_ASM_USES_INTRIN
4130	_bittestandset((long *)pvBitmap, iBit);
4131
4132	# elif RT_INLINE_ASM_GNU_STYLE
4133	__asm__ __volatile__("btsl %1, %0"
4134	: "=m" ((volatile long )pvBitmap)
4135	: "Ir" (iBit),
4136	"m" ((volatile long )pvBitmap)
4137	: "memory");
4138	# else
4139	__asm
4140	{
4141	# ifdef RT_ARCH_AMD64
4142	mov rax, [pvBitmap]
4143	mov edx, [iBit]
4144	bts [rax], edx
4145	# else
4146	mov eax, [pvBitmap]
4147	mov edx, [iBit]
4148	bts [eax], edx
4149	# endif
4150	}
4151	# endif
4152	}
4153	#endif
4154
4155
4156	/**
4157	* Atomically sets a bit in a bitmap, ordered.
4158	*
4159	* @param pvBitmap Pointer to the bitmap. Must be 32-bit aligned, otherwise
4160	* the memory access isn't atomic!
4161	* @param iBit The bit to set.
4162	*
4163	* @remarks x86: Requires a 386 or later.
4164	*/
4165	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
4166	DECLASM(void) ASMAtomicBitSet(volatile void *pvBitmap, int32_t iBit);
4167	#else
4168	DECLINLINE(void) ASMAtomicBitSet(volatile void *pvBitmap, int32_t iBit)
4169	{
4170	AssertMsg(!((uintptr_t)pvBitmap & 3), ("address %p not 32-bit aligned", pvBitmap));
4171	# if RT_INLINE_ASM_USES_INTRIN
4172	_interlockedbittestandset((long *)pvBitmap, iBit);
4173	# elif RT_INLINE_ASM_GNU_STYLE
4174	__asm__ __volatile__("lock; btsl %1, %0"
4175	: "=m" ((volatile long )pvBitmap)
4176	: "Ir" (iBit),
4177	"m" ((volatile long )pvBitmap)
4178	: "memory");
4179	# else
4180	__asm
4181	{
4182	# ifdef RT_ARCH_AMD64
4183	mov rax, [pvBitmap]
4184	mov edx, [iBit]
4185	lock bts [rax], edx
4186	# else
4187	mov eax, [pvBitmap]
4188	mov edx, [iBit]
4189	lock bts [eax], edx
4190	# endif
4191	}
4192	# endif
4193	}
4194	#endif
4195
4196
4197	/**
4198	* Clears a bit in a bitmap.
4199	*
4200	* @param pvBitmap Pointer to the bitmap.
4201	* @param iBit The bit to clear.
4202	*
4203	* @remarks The 32-bit aligning of pvBitmap is not a strict requirement.
4204	* However, doing so will yield better performance as well as avoiding
4205	* traps accessing the last bits in the bitmap.
4206	*/
4207	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
4208	DECLASM(void) ASMBitClear(volatile void *pvBitmap, int32_t iBit);
4209	#else
4210	DECLINLINE(void) ASMBitClear(volatile void *pvBitmap, int32_t iBit)
4211	{
4212	# if RT_INLINE_ASM_USES_INTRIN
4213	_bittestandreset((long *)pvBitmap, iBit);
4214
4215	# elif RT_INLINE_ASM_GNU_STYLE
4216	__asm__ __volatile__("btrl %1, %0"
4217	: "=m" ((volatile long )pvBitmap)
4218	: "Ir" (iBit),
4219	"m" ((volatile long )pvBitmap)
4220	: "memory");
4221	# else
4222	__asm
4223	{
4224	# ifdef RT_ARCH_AMD64
4225	mov rax, [pvBitmap]
4226	mov edx, [iBit]
4227	btr [rax], edx
4228	# else
4229	mov eax, [pvBitmap]
4230	mov edx, [iBit]
4231	btr [eax], edx
4232	# endif
4233	}
4234	# endif
4235	}
4236	#endif
4237
4238
4239	/**
4240	* Atomically clears a bit in a bitmap, ordered.
4241	*
4242	* @param pvBitmap Pointer to the bitmap. Must be 32-bit aligned, otherwise
4243	* the memory access isn't atomic!
4244	* @param iBit The bit to toggle set.
4245	*
4246	* @remarks No memory barrier, take care on smp.
4247	* @remarks x86: Requires a 386 or later.
4248	*/
4249	#if RT_INLINE_ASM_EXTERNAL
4250	DECLASM(void) ASMAtomicBitClear(volatile void *pvBitmap, int32_t iBit);
4251	#else
4252	DECLINLINE(void) ASMAtomicBitClear(volatile void *pvBitmap, int32_t iBit)
4253	{
4254	AssertMsg(!((uintptr_t)pvBitmap & 3), ("address %p not 32-bit aligned", pvBitmap));
4255	# if RT_INLINE_ASM_GNU_STYLE
4256	__asm__ __volatile__("lock; btrl %1, %0"
4257	: "=m" ((volatile long )pvBitmap)
4258	: "Ir" (iBit),
4259	"m" ((volatile long )pvBitmap)
4260	: "memory");
4261	# else
4262	__asm
4263	{
4264	# ifdef RT_ARCH_AMD64
4265	mov rax, [pvBitmap]
4266	mov edx, [iBit]
4267	lock btr [rax], edx
4268	# else
4269	mov eax, [pvBitmap]
4270	mov edx, [iBit]
4271	lock btr [eax], edx
4272	# endif
4273	}
4274	# endif
4275	}
4276	#endif
4277
4278
4279	/**
4280	* Toggles a bit in a bitmap.
4281	*
4282	* @param pvBitmap Pointer to the bitmap.
4283	* @param iBit The bit to toggle.
4284	*
4285	* @remarks The 32-bit aligning of pvBitmap is not a strict requirement.
4286	* However, doing so will yield better performance as well as avoiding
4287	* traps accessing the last bits in the bitmap.
4288	*/
4289	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
4290	DECLASM(void) ASMBitToggle(volatile void *pvBitmap, int32_t iBit);
4291	#else
4292	DECLINLINE(void) ASMBitToggle(volatile void *pvBitmap, int32_t iBit)
4293	{
4294	# if RT_INLINE_ASM_USES_INTRIN
4295	_bittestandcomplement((long *)pvBitmap, iBit);
4296	# elif RT_INLINE_ASM_GNU_STYLE
4297	__asm__ __volatile__("btcl %1, %0"
4298	: "=m" ((volatile long )pvBitmap)
4299	: "Ir" (iBit),
4300	"m" ((volatile long )pvBitmap)
4301	: "memory");
4302	# else
4303	__asm
4304	{
4305	# ifdef RT_ARCH_AMD64
4306	mov rax, [pvBitmap]
4307	mov edx, [iBit]
4308	btc [rax], edx
4309	# else
4310	mov eax, [pvBitmap]
4311	mov edx, [iBit]
4312	btc [eax], edx
4313	# endif
4314	}
4315	# endif
4316	}
4317	#endif
4318
4319
4320	/**
4321	* Atomically toggles a bit in a bitmap, ordered.
4322	*
4323	* @param pvBitmap Pointer to the bitmap. Must be 32-bit aligned, otherwise
4324	* the memory access isn't atomic!
4325	* @param iBit The bit to test and set.
4326	*
4327	* @remarks x86: Requires a 386 or later.
4328	*/
4329	#if RT_INLINE_ASM_EXTERNAL
4330	DECLASM(void) ASMAtomicBitToggle(volatile void *pvBitmap, int32_t iBit);
4331	#else
4332	DECLINLINE(void) ASMAtomicBitToggle(volatile void *pvBitmap, int32_t iBit)
4333	{
4334	AssertMsg(!((uintptr_t)pvBitmap & 3), ("address %p not 32-bit aligned", pvBitmap));
4335	# if RT_INLINE_ASM_GNU_STYLE
4336	__asm__ __volatile__("lock; btcl %1, %0"
4337	: "=m" ((volatile long )pvBitmap)
4338	: "Ir" (iBit),
4339	"m" ((volatile long )pvBitmap)
4340	: "memory");
4341	# else
4342	__asm
4343	{
4344	# ifdef RT_ARCH_AMD64
4345	mov rax, [pvBitmap]
4346	mov edx, [iBit]
4347	lock btc [rax], edx
4348	# else
4349	mov eax, [pvBitmap]
4350	mov edx, [iBit]
4351	lock btc [eax], edx
4352	# endif
4353	}
4354	# endif
4355	}
4356	#endif
4357
4358
4359	/**
4360	* Tests and sets a bit in a bitmap.
4361	*
4362	* @returns true if the bit was set.
4363	* @returns false if the bit was clear.
4364	*
4365	* @param pvBitmap Pointer to the bitmap.
4366	* @param iBit The bit to test and set.
4367	*
4368	* @remarks The 32-bit aligning of pvBitmap is not a strict requirement.
4369	* However, doing so will yield better performance as well as avoiding
4370	* traps accessing the last bits in the bitmap.
4371	*/
4372	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
4373	DECLASM(bool) ASMBitTestAndSet(volatile void *pvBitmap, int32_t iBit);
4374	#else
4375	DECLINLINE(bool) ASMBitTestAndSet(volatile void *pvBitmap, int32_t iBit)
4376	{
4377	union { bool f; uint32_t u32; uint8_t u8; } rc;
4378	# if RT_INLINE_ASM_USES_INTRIN
4379	rc.u8 = _bittestandset((long *)pvBitmap, iBit);
4380
4381	# elif RT_INLINE_ASM_GNU_STYLE
4382	__asm__ __volatile__("btsl %2, %1\n\t"
4383	"setc %b0\n\t"
4384	"andl $1, %0\n\t"
4385	: "=q" (rc.u32),
4386	"=m" ((volatile long )pvBitmap)
4387	: "Ir" (iBit),
4388	"m" ((volatile long )pvBitmap)
4389	: "memory");
4390	# else
4391	__asm
4392	{
4393	mov edx, [iBit]
4394	# ifdef RT_ARCH_AMD64
4395	mov rax, [pvBitmap]
4396	bts [rax], edx
4397	# else
4398	mov eax, [pvBitmap]
4399	bts [eax], edx
4400	# endif
4401	setc al
4402	and eax, 1
4403	mov [rc.u32], eax
4404	}
4405	# endif
4406	return rc.f;
4407	}
4408	#endif
4409
4410
4411	/**
4412	* Atomically tests and sets a bit in a bitmap, ordered.
4413	*
4414	* @returns true if the bit was set.
4415	* @returns false if the bit was clear.
4416	*
4417	* @param pvBitmap Pointer to the bitmap. Must be 32-bit aligned, otherwise
4418	* the memory access isn't atomic!
4419	* @param iBit The bit to set.
4420	*
4421	* @remarks x86: Requires a 386 or later.
4422	*/
4423	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
4424	DECLASM(bool) ASMAtomicBitTestAndSet(volatile void *pvBitmap, int32_t iBit);
4425	#else
4426	DECLINLINE(bool) ASMAtomicBitTestAndSet(volatile void *pvBitmap, int32_t iBit)
4427	{
4428	union { bool f; uint32_t u32; uint8_t u8; } rc;
4429	AssertMsg(!((uintptr_t)pvBitmap & 3), ("address %p not 32-bit aligned", pvBitmap));
4430	# if RT_INLINE_ASM_USES_INTRIN
4431	rc.u8 = _interlockedbittestandset((long *)pvBitmap, iBit);
4432	# elif RT_INLINE_ASM_GNU_STYLE
4433	__asm__ __volatile__("lock; btsl %2, %1\n\t"
4434	"setc %b0\n\t"
4435	"andl $1, %0\n\t"
4436	: "=q" (rc.u32),
4437	"=m" ((volatile long )pvBitmap)
4438	: "Ir" (iBit),
4439	"m" ((volatile long )pvBitmap)
4440	: "memory");
4441	# else
4442	__asm
4443	{
4444	mov edx, [iBit]
4445	# ifdef RT_ARCH_AMD64
4446	mov rax, [pvBitmap]
4447	lock bts [rax], edx
4448	# else
4449	mov eax, [pvBitmap]
4450	lock bts [eax], edx
4451	# endif
4452	setc al
4453	and eax, 1
4454	mov [rc.u32], eax
4455	}
4456	# endif
4457	return rc.f;
4458	}
4459	#endif
4460
4461
4462	/**
4463	* Tests and clears a bit in a bitmap.
4464	*
4465	* @returns true if the bit was set.
4466	* @returns false if the bit was clear.
4467	*
4468	* @param pvBitmap Pointer to the bitmap.
4469	* @param iBit The bit to test and clear.
4470	*
4471	* @remarks The 32-bit aligning of pvBitmap is not a strict requirement.
4472	* However, doing so will yield better performance as well as avoiding
4473	* traps accessing the last bits in the bitmap.
4474	*/
4475	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
4476	DECLASM(bool) ASMBitTestAndClear(volatile void *pvBitmap, int32_t iBit);
4477	#else
4478	DECLINLINE(bool) ASMBitTestAndClear(volatile void *pvBitmap, int32_t iBit)
4479	{
4480	union { bool f; uint32_t u32; uint8_t u8; } rc;
4481	# if RT_INLINE_ASM_USES_INTRIN
4482	rc.u8 = _bittestandreset((long *)pvBitmap, iBit);
4483
4484	# elif RT_INLINE_ASM_GNU_STYLE
4485	__asm__ __volatile__("btrl %2, %1\n\t"
4486	"setc %b0\n\t"
4487	"andl $1, %0\n\t"
4488	: "=q" (rc.u32),
4489	"=m" ((volatile long )pvBitmap)
4490	: "Ir" (iBit),
4491	"m" ((volatile long )pvBitmap)
4492	: "memory");
4493	# else
4494	__asm
4495	{
4496	mov edx, [iBit]
4497	# ifdef RT_ARCH_AMD64
4498	mov rax, [pvBitmap]
4499	btr [rax], edx
4500	# else
4501	mov eax, [pvBitmap]
4502	btr [eax], edx
4503	# endif
4504	setc al
4505	and eax, 1
4506	mov [rc.u32], eax
4507	}
4508	# endif
4509	return rc.f;
4510	}
4511	#endif
4512
4513
4514	/**
4515	* Atomically tests and clears a bit in a bitmap, ordered.
4516	*
4517	* @returns true if the bit was set.
4518	* @returns false if the bit was clear.
4519	*
4520	* @param pvBitmap Pointer to the bitmap. Must be 32-bit aligned, otherwise
4521	* the memory access isn't atomic!
4522	* @param iBit The bit to test and clear.
4523	*
4524	* @remarks No memory barrier, take care on smp.
4525	* @remarks x86: Requires a 386 or later.
4526	*/
4527	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
4528	DECLASM(bool) ASMAtomicBitTestAndClear(volatile void *pvBitmap, int32_t iBit);
4529	#else
4530	DECLINLINE(bool) ASMAtomicBitTestAndClear(volatile void *pvBitmap, int32_t iBit)
4531	{
4532	union { bool f; uint32_t u32; uint8_t u8; } rc;
4533	AssertMsg(!((uintptr_t)pvBitmap & 3), ("address %p not 32-bit aligned", pvBitmap));
4534	# if RT_INLINE_ASM_USES_INTRIN
4535	rc.u8 = _interlockedbittestandreset((long *)pvBitmap, iBit);
4536
4537	# elif RT_INLINE_ASM_GNU_STYLE
4538	__asm__ __volatile__("lock; btrl %2, %1\n\t"
4539	"setc %b0\n\t"
4540	"andl $1, %0\n\t"
4541	: "=q" (rc.u32),
4542	"=m" ((volatile long )pvBitmap)
4543	: "Ir" (iBit),
4544	"m" ((volatile long )pvBitmap)
4545	: "memory");
4546	# else
4547	__asm
4548	{
4549	mov edx, [iBit]
4550	# ifdef RT_ARCH_AMD64
4551	mov rax, [pvBitmap]
4552	lock btr [rax], edx
4553	# else
4554	mov eax, [pvBitmap]
4555	lock btr [eax], edx
4556	# endif
4557	setc al
4558	and eax, 1
4559	mov [rc.u32], eax
4560	}
4561	# endif
4562	return rc.f;
4563	}
4564	#endif
4565
4566
4567	/**
4568	* Tests and toggles a bit in a bitmap.
4569	*
4570	* @returns true if the bit was set.
4571	* @returns false if the bit was clear.
4572	*
4573	* @param pvBitmap Pointer to the bitmap.
4574	* @param iBit The bit to test and toggle.
4575	*
4576	* @remarks The 32-bit aligning of pvBitmap is not a strict requirement.
4577	* However, doing so will yield better performance as well as avoiding
4578	* traps accessing the last bits in the bitmap.
4579	*/
4580	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
4581	DECLASM(bool) ASMBitTestAndToggle(volatile void *pvBitmap, int32_t iBit);
4582	#else
4583	DECLINLINE(bool) ASMBitTestAndToggle(volatile void *pvBitmap, int32_t iBit)
4584	{
4585	union { bool f; uint32_t u32; uint8_t u8; } rc;
4586	# if RT_INLINE_ASM_USES_INTRIN
4587	rc.u8 = _bittestandcomplement((long *)pvBitmap, iBit);
4588
4589	# elif RT_INLINE_ASM_GNU_STYLE
4590	__asm__ __volatile__("btcl %2, %1\n\t"
4591	"setc %b0\n\t"
4592	"andl $1, %0\n\t"
4593	: "=q" (rc.u32),
4594	"=m" ((volatile long )pvBitmap)
4595	: "Ir" (iBit),
4596	"m" ((volatile long )pvBitmap)
4597	: "memory");
4598	# else
4599	__asm
4600	{
4601	mov edx, [iBit]
4602	# ifdef RT_ARCH_AMD64
4603	mov rax, [pvBitmap]
4604	btc [rax], edx
4605	# else
4606	mov eax, [pvBitmap]
4607	btc [eax], edx
4608	# endif
4609	setc al
4610	and eax, 1
4611	mov [rc.u32], eax
4612	}
4613	# endif
4614	return rc.f;
4615	}
4616	#endif
4617
4618
4619	/**
4620	* Atomically tests and toggles a bit in a bitmap, ordered.
4621	*
4622	* @returns true if the bit was set.
4623	* @returns false if the bit was clear.
4624	*
4625	* @param pvBitmap Pointer to the bitmap. Must be 32-bit aligned, otherwise
4626	* the memory access isn't atomic!
4627	* @param iBit The bit to test and toggle.
4628	*
4629	* @remarks x86: Requires a 386 or later.
4630	*/
4631	#if RT_INLINE_ASM_EXTERNAL
4632	DECLASM(bool) ASMAtomicBitTestAndToggle(volatile void *pvBitmap, int32_t iBit);
4633	#else
4634	DECLINLINE(bool) ASMAtomicBitTestAndToggle(volatile void *pvBitmap, int32_t iBit)
4635	{
4636	union { bool f; uint32_t u32; uint8_t u8; } rc;
4637	AssertMsg(!((uintptr_t)pvBitmap & 3), ("address %p not 32-bit aligned", pvBitmap));
4638	# if RT_INLINE_ASM_GNU_STYLE
4639	__asm__ __volatile__("lock; btcl %2, %1\n\t"
4640	"setc %b0\n\t"
4641	"andl $1, %0\n\t"
4642	: "=q" (rc.u32),
4643	"=m" ((volatile long )pvBitmap)
4644	: "Ir" (iBit),
4645	"m" ((volatile long )pvBitmap)
4646	: "memory");
4647	# else
4648	__asm
4649	{
4650	mov edx, [iBit]
4651	# ifdef RT_ARCH_AMD64
4652	mov rax, [pvBitmap]
4653	lock btc [rax], edx
4654	# else
4655	mov eax, [pvBitmap]
4656	lock btc [eax], edx
4657	# endif
4658	setc al
4659	and eax, 1
4660	mov [rc.u32], eax
4661	}
4662	# endif
4663	return rc.f;
4664	}
4665	#endif
4666
4667
4668	/**
4669	* Tests if a bit in a bitmap is set.
4670	*
4671	* @returns true if the bit is set.
4672	* @returns false if the bit is clear.
4673	*
4674	* @param pvBitmap Pointer to the bitmap.
4675	* @param iBit The bit to test.
4676	*
4677	* @remarks The 32-bit aligning of pvBitmap is not a strict requirement.
4678	* However, doing so will yield better performance as well as avoiding
4679	* traps accessing the last bits in the bitmap.
4680	*/
4681	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
4682	DECLASM(bool) ASMBitTest(const volatile void *pvBitmap, int32_t iBit);
4683	#else
4684	DECLINLINE(bool) ASMBitTest(const volatile void *pvBitmap, int32_t iBit)
4685	{
4686	union { bool f; uint32_t u32; uint8_t u8; } rc;
4687	# if RT_INLINE_ASM_USES_INTRIN
4688	rc.u32 = _bittest((long *)pvBitmap, iBit);
4689	# elif RT_INLINE_ASM_GNU_STYLE
4690
4691	__asm__ __volatile__("btl %2, %1\n\t"
4692	"setc %b0\n\t"
4693	"andl $1, %0\n\t"
4694	: "=q" (rc.u32)
4695	: "m" ((const volatile long )pvBitmap),
4696	"Ir" (iBit)
4697	: "memory");
4698	# else
4699	__asm
4700	{
4701	mov edx, [iBit]
4702	# ifdef RT_ARCH_AMD64
4703	mov rax, [pvBitmap]
4704	bt [rax], edx
4705	# else
4706	mov eax, [pvBitmap]
4707	bt [eax], edx
4708	# endif
4709	setc al
4710	and eax, 1
4711	mov [rc.u32], eax
4712	}
4713	# endif
4714	return rc.f;
4715	}
4716	#endif
4717
4718
4719	/**
4720	* Clears a bit range within a bitmap.
4721	*
4722	* @param pvBitmap Pointer to the bitmap.
4723	* @param iBitStart The First bit to clear.
4724	* @param iBitEnd The first bit not to clear.
4725	*/
4726	DECLINLINE(void) ASMBitClearRange(volatile void *pvBitmap, int32_t iBitStart, int32_t iBitEnd)
4727	{
4728	if (iBitStart < iBitEnd)
4729	{
4730	volatile uint32_t pu32 = (volatile uint32_t )pvBitmap + (iBitStart >> 5);
4731	int32_t iStart = iBitStart & ~31;
4732	int32_t iEnd = iBitEnd & ~31;
4733	if (iStart == iEnd)
4734	*pu32 &= ((UINT32_C(1) << (iBitStart & 31)) - 1) \| ~((UINT32_C(1) << (iBitEnd & 31)) - 1);
4735	else
4736	{
4737	/* bits in first dword. */
4738	if (iBitStart & 31)
4739	{
4740	*pu32 &= (UINT32_C(1) << (iBitStart & 31)) - 1;
4741	pu32++;
4742	iBitStart = iStart + 32;
4743	}
4744
4745	/* whole dword. */
4746	if (iBitStart != iEnd)
4747	ASMMemZero32(pu32, (iEnd - iBitStart) >> 3);
4748
4749	/* bits in last dword. */
4750	if (iBitEnd & 31)
4751	{
4752	pu32 = (volatile uint32_t *)pvBitmap + (iBitEnd >> 5);
4753	*pu32 &= ~((UINT32_C(1) << (iBitEnd & 31)) - 1);
4754	}
4755	}
4756	}
4757	}
4758
4759
4760	/**
4761	* Sets a bit range within a bitmap.
4762	*
4763	* @param pvBitmap Pointer to the bitmap.
4764	* @param iBitStart The First bit to set.
4765	* @param iBitEnd The first bit not to set.
4766	*/
4767	DECLINLINE(void) ASMBitSetRange(volatile void *pvBitmap, int32_t iBitStart, int32_t iBitEnd)
4768	{
4769	if (iBitStart < iBitEnd)
4770	{
4771	volatile uint32_t pu32 = (volatile uint32_t )pvBitmap + (iBitStart >> 5);
4772	int32_t iStart = iBitStart & ~31;
4773	int32_t iEnd = iBitEnd & ~31;
4774	if (iStart == iEnd)
4775	*pu32 \|= ((UINT32_C(1) << (iBitEnd - iBitStart)) - 1) << (iBitStart & 31);
4776	else
4777	{
4778	/* bits in first dword. */
4779	if (iBitStart & 31)
4780	{
4781	*pu32 \|= ~((UINT32_C(1) << (iBitStart & 31)) - 1);
4782	pu32++;
4783	iBitStart = iStart + 32;
4784	}
4785
4786	/* whole dword. */
4787	if (iBitStart != iEnd)
4788	ASMMemFill32(pu32, (iEnd - iBitStart) >> 3, ~UINT32_C(0));
4789
4790	/* bits in last dword. */
4791	if (iBitEnd & 31)
4792	{
4793	pu32 = (volatile uint32_t *)pvBitmap + (iBitEnd >> 5);
4794	*pu32 \|= (UINT32_C(1) << (iBitEnd & 31)) - 1;
4795	}
4796	}
4797	}
4798	}
4799
4800
4801	/**
4802	* Finds the first clear bit in a bitmap.
4803	*
4804	* @returns Index of the first zero bit.
4805	* @returns -1 if no clear bit was found.
4806	* @param pvBitmap Pointer to the bitmap.
4807	* @param cBits The number of bits in the bitmap. Multiple of 32.
4808	*/
4809	#if RT_INLINE_ASM_EXTERNAL
4810	DECLASM(int32_t) ASMBitFirstClear(const volatile void *pvBitmap, uint32_t cBits);
4811	#else
4812	DECLINLINE(int32_t) ASMBitFirstClear(const volatile void *pvBitmap, uint32_t cBits)
4813	{
4814	if (cBits)
4815	{
4816	int32_t iBit;
4817	# if RT_INLINE_ASM_GNU_STYLE
4818	RTCCUINTREG uEAX, uECX, uEDI;
4819	cBits = RT_ALIGN_32(cBits, 32);
4820	__asm__ __volatile__("repe; scasl\n\t"
4821	"je 1f\n\t"
4822	# ifdef RT_ARCH_AMD64
4823	"lea -4(%%rdi), %%rdi\n\t"
4824	"xorl (%%rdi), %%eax\n\t"
4825	"subq %5, %%rdi\n\t"
4826	# else
4827	"lea -4(%%edi), %%edi\n\t"
4828	"xorl (%%edi), %%eax\n\t"
4829	"subl %5, %%edi\n\t"
4830	# endif
4831	"shll $3, %%edi\n\t"
4832	"bsfl %%eax, %%edx\n\t"
4833	"addl %%edi, %%edx\n\t"
4834	"1:\t\n"
4835	: "=d" (iBit),
4836	"=&c" (uECX),
4837	"=&D" (uEDI),
4838	"=&a" (uEAX)
4839	: "0" (0xffffffff),
4840	"mr" (pvBitmap),
4841	"1" (cBits >> 5),
4842	"2" (pvBitmap),
4843	"3" (0xffffffff));
4844	# else
4845	cBits = RT_ALIGN_32(cBits, 32);
4846	__asm
4847	{
4848	# ifdef RT_ARCH_AMD64
4849	mov rdi, [pvBitmap]
4850	mov rbx, rdi
4851	# else
4852	mov edi, [pvBitmap]
4853	mov ebx, edi
4854	# endif
4855	mov edx, 0ffffffffh
4856	mov eax, edx
4857	mov ecx, [cBits]
4858	shr ecx, 5
4859	repe scasd
4860	je done
4861
4862	# ifdef RT_ARCH_AMD64
4863	lea rdi, [rdi - 4]
4864	xor eax, [rdi]
4865	sub rdi, rbx
4866	# else
4867	lea edi, [edi - 4]
4868	xor eax, [edi]
4869	sub edi, ebx
4870	# endif
4871	shl edi, 3
4872	bsf edx, eax
4873	add edx, edi
4874	done:
4875	mov [iBit], edx
4876	}
4877	# endif
4878	return iBit;
4879	}
4880	return -1;
4881	}
4882	#endif
4883
4884
4885	/**
4886	* Finds the next clear bit in a bitmap.
4887	*
4888	* @returns Index of the first zero bit.
4889	* @returns -1 if no clear bit was found.
4890	* @param pvBitmap Pointer to the bitmap.
4891	* @param cBits The number of bits in the bitmap. Multiple of 32.
4892	* @param iBitPrev The bit returned from the last search.
4893	* The search will start at iBitPrev + 1.
4894	*/
4895	#if RT_INLINE_ASM_EXTERNAL
4896	DECLASM(int) ASMBitNextClear(const volatile void *pvBitmap, uint32_t cBits, uint32_t iBitPrev);
4897	#else
4898	DECLINLINE(int) ASMBitNextClear(const volatile void *pvBitmap, uint32_t cBits, uint32_t iBitPrev)
4899	{
4900	const volatile uint32_t pau32Bitmap = (const volatile uint32_t )pvBitmap;
4901	int iBit = ++iBitPrev & 31;
4902	if (iBit)
4903	{
4904	/*
4905	* Inspect the 32-bit word containing the unaligned bit.
4906	*/
4907	uint32_t u32 = ~pau32Bitmap[iBitPrev / 32] >> iBit;
4908
4909	# if RT_INLINE_ASM_USES_INTRIN
4910	unsigned long ulBit = 0;
4911	if (_BitScanForward(&ulBit, u32))
4912	return ulBit + iBitPrev;
4913	# else
4914	# if RT_INLINE_ASM_GNU_STYLE
4915	__asm__ __volatile__("bsf %1, %0\n\t"
4916	"jnz 1f\n\t"
4917	"movl $-1, %0\n\t"
4918	"1:\n\t"
4919	: "=r" (iBit)
4920	: "r" (u32));
4921	# else
4922	__asm
4923	{
4924	mov edx, [u32]
4925	bsf eax, edx
4926	jnz done
4927	mov eax, 0ffffffffh
4928	done:
4929	mov [iBit], eax
4930	}
4931	# endif
4932	if (iBit >= 0)
4933	return iBit + iBitPrev;
4934	# endif
4935
4936	/*
4937	* Skip ahead and see if there is anything left to search.
4938	*/
4939	iBitPrev \|= 31;
4940	iBitPrev++;
4941	if (cBits <= (uint32_t)iBitPrev)
4942	return -1;
4943	}
4944
4945	/*
4946	* 32-bit aligned search, let ASMBitFirstClear do the dirty work.
4947	*/
4948	iBit = ASMBitFirstClear(&pau32Bitmap[iBitPrev / 32], cBits - iBitPrev);
4949	if (iBit >= 0)
4950	iBit += iBitPrev;
4951	return iBit;
4952	}
4953	#endif
4954
4955
4956	/**
4957	* Finds the first set bit in a bitmap.
4958	*
4959	* @returns Index of the first set bit.
4960	* @returns -1 if no clear bit was found.
4961	* @param pvBitmap Pointer to the bitmap.
4962	* @param cBits The number of bits in the bitmap. Multiple of 32.
4963	*/
4964	#if RT_INLINE_ASM_EXTERNAL
4965	DECLASM(int32_t) ASMBitFirstSet(const volatile void *pvBitmap, uint32_t cBits);
4966	#else
4967	DECLINLINE(int32_t) ASMBitFirstSet(const volatile void *pvBitmap, uint32_t cBits)
4968	{
4969	if (cBits)
4970	{
4971	int32_t iBit;
4972	# if RT_INLINE_ASM_GNU_STYLE
4973	RTCCUINTREG uEAX, uECX, uEDI;
4974	cBits = RT_ALIGN_32(cBits, 32);
4975	__asm__ __volatile__("repe; scasl\n\t"
4976	"je 1f\n\t"
4977	# ifdef RT_ARCH_AMD64
4978	"lea -4(%%rdi), %%rdi\n\t"
4979	"movl (%%rdi), %%eax\n\t"
4980	"subq %5, %%rdi\n\t"
4981	# else
4982	"lea -4(%%edi), %%edi\n\t"
4983	"movl (%%edi), %%eax\n\t"
4984	"subl %5, %%edi\n\t"
4985	# endif
4986	"shll $3, %%edi\n\t"
4987	"bsfl %%eax, %%edx\n\t"
4988	"addl %%edi, %%edx\n\t"
4989	"1:\t\n"
4990	: "=d" (iBit),
4991	"=&c" (uECX),
4992	"=&D" (uEDI),
4993	"=&a" (uEAX)
4994	: "0" (0xffffffff),
4995	"mr" (pvBitmap),
4996	"1" (cBits >> 5),
4997	"2" (pvBitmap),
4998	"3" (0));
4999	# else
5000	cBits = RT_ALIGN_32(cBits, 32);
5001	__asm
5002	{
5003	# ifdef RT_ARCH_AMD64
5004	mov rdi, [pvBitmap]
5005	mov rbx, rdi
5006	# else
5007	mov edi, [pvBitmap]
5008	mov ebx, edi
5009	# endif
5010	mov edx, 0ffffffffh
5011	xor eax, eax
5012	mov ecx, [cBits]
5013	shr ecx, 5
5014	repe scasd
5015	je done
5016	# ifdef RT_ARCH_AMD64
5017	lea rdi, [rdi - 4]
5018	mov eax, [rdi]
5019	sub rdi, rbx
5020	# else
5021	lea edi, [edi - 4]
5022	mov eax, [edi]
5023	sub edi, ebx
5024	# endif
5025	shl edi, 3
5026	bsf edx, eax
5027	add edx, edi
5028	done:
5029	mov [iBit], edx
5030	}
5031	# endif
5032	return iBit;
5033	}
5034	return -1;
5035	}
5036	#endif
5037
5038
5039	/**
5040	* Finds the next set bit in a bitmap.
5041	*
5042	* @returns Index of the next set bit.
5043	* @returns -1 if no set bit was found.
5044	* @param pvBitmap Pointer to the bitmap.
5045	* @param cBits The number of bits in the bitmap. Multiple of 32.
5046	* @param iBitPrev The bit returned from the last search.
5047	* The search will start at iBitPrev + 1.
5048	*/
5049	#if RT_INLINE_ASM_EXTERNAL
5050	DECLASM(int) ASMBitNextSet(const volatile void *pvBitmap, uint32_t cBits, uint32_t iBitPrev);
5051	#else
5052	DECLINLINE(int) ASMBitNextSet(const volatile void *pvBitmap, uint32_t cBits, uint32_t iBitPrev)
5053	{
5054	const volatile uint32_t pau32Bitmap = (const volatile uint32_t )pvBitmap;
5055	int iBit = ++iBitPrev & 31;
5056	if (iBit)
5057	{
5058	/*
5059	* Inspect the 32-bit word containing the unaligned bit.
5060	*/
5061	uint32_t u32 = pau32Bitmap[iBitPrev / 32] >> iBit;
5062
5063	# if RT_INLINE_ASM_USES_INTRIN
5064	unsigned long ulBit = 0;
5065	if (_BitScanForward(&ulBit, u32))
5066	return ulBit + iBitPrev;
5067	# else
5068	# if RT_INLINE_ASM_GNU_STYLE
5069	__asm__ __volatile__("bsf %1, %0\n\t"
5070	"jnz 1f\n\t"
5071	"movl $-1, %0\n\t"
5072	"1:\n\t"
5073	: "=r" (iBit)
5074	: "r" (u32));
5075	# else
5076	__asm
5077	{
5078	mov edx, [u32]
5079	bsf eax, edx
5080	jnz done
5081	mov eax, 0ffffffffh
5082	done:
5083	mov [iBit], eax
5084	}
5085	# endif
5086	if (iBit >= 0)
5087	return iBit + iBitPrev;
5088	# endif
5089
5090	/*
5091	* Skip ahead and see if there is anything left to search.
5092	*/
5093	iBitPrev \|= 31;
5094	iBitPrev++;
5095	if (cBits <= (uint32_t)iBitPrev)
5096	return -1;
5097	}
5098
5099	/*
5100	* 32-bit aligned search, let ASMBitFirstClear do the dirty work.
5101	*/
5102	iBit = ASMBitFirstSet(&pau32Bitmap[iBitPrev / 32], cBits - iBitPrev);
5103	if (iBit >= 0)
5104	iBit += iBitPrev;
5105	return iBit;
5106	}
5107	#endif
5108
5109
5110	/**
5111	* Finds the first bit which is set in the given 32-bit integer.
5112	* Bits are numbered from 1 (least significant) to 32.
5113	*
5114	* @returns index [1..32] of the first set bit.
5115	* @returns 0 if all bits are cleared.
5116	* @param u32 Integer to search for set bits.
5117	* @remarks Similar to ffs() in BSD.
5118	*/
5119	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
5120	DECLASM(unsigned) ASMBitFirstSetU32(uint32_t u32);
5121	#else
5122	DECLINLINE(unsigned) ASMBitFirstSetU32(uint32_t u32)
5123	{
5124	# if RT_INLINE_ASM_USES_INTRIN
5125	unsigned long iBit;
5126	if (_BitScanForward(&iBit, u32))
5127	iBit++;
5128	else
5129	iBit = 0;
5130	# elif RT_INLINE_ASM_GNU_STYLE
5131	uint32_t iBit;
5132	__asm__ __volatile__("bsf %1, %0\n\t"
5133	"jnz 1f\n\t"
5134	"xorl %0, %0\n\t"
5135	"jmp 2f\n"
5136	"1:\n\t"
5137	"incl %0\n"
5138	"2:\n\t"
5139	: "=r" (iBit)
5140	: "rm" (u32));
5141	# else
5142	uint32_t iBit;
5143	_asm
5144	{
5145	bsf eax, [u32]
5146	jnz found
5147	xor eax, eax
5148	jmp done
5149	found:
5150	inc eax
5151	done:
5152	mov [iBit], eax
5153	}
5154	# endif
5155	return iBit;
5156	}
5157	#endif
5158
5159
5160	/**
5161	* Finds the first bit which is set in the given 32-bit integer.
5162	* Bits are numbered from 1 (least significant) to 32.
5163	*
5164	* @returns index [1..32] of the first set bit.
5165	* @returns 0 if all bits are cleared.
5166	* @param i32 Integer to search for set bits.
5167	* @remark Similar to ffs() in BSD.
5168	*/
5169	DECLINLINE(unsigned) ASMBitFirstSetS32(int32_t i32)
5170	{
5171	return ASMBitFirstSetU32((uint32_t)i32);
5172	}
5173
5174
5175	/**
5176	* Finds the first bit which is set in the given 64-bit integer.
5177	*
5178	* Bits are numbered from 1 (least significant) to 64.
5179	*
5180	* @returns index [1..64] of the first set bit.
5181	* @returns 0 if all bits are cleared.
5182	* @param u64 Integer to search for set bits.
5183	* @remarks Similar to ffs() in BSD.
5184	*/
5185	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
5186	DECLASM(unsigned) ASMBitFirstSetU64(uint64_t u64);
5187	#else
5188	DECLINLINE(unsigned) ASMBitFirstSetU64(uint64_t u64)
5189	{
5190	# if RT_INLINE_ASM_USES_INTRIN
5191	unsigned long iBit;
5192	# if ARCH_BITS == 64
5193	if (_BitScanForward64(&iBit, u64))
5194	iBit++;
5195	else
5196	iBit = 0;
5197	# else
5198	if (_BitScanForward(&iBit, (uint32_t)u64))
5199	iBit++;
5200	else if (_BitScanForward(&iBit, (uint32_t)(u64 >> 32)))
5201	iBit += 33;
5202	else
5203	iBit = 0;
5204	# endif
5205	# elif RT_INLINE_ASM_GNU_STYLE && ARCH_BITS == 64
5206	uint64_t iBit;
5207	__asm__ __volatile__("bsfq %1, %0\n\t"
5208	"jnz 1f\n\t"
5209	"xorl %0, %0\n\t"
5210	"jmp 2f\n"
5211	"1:\n\t"
5212	"incl %0\n"
5213	"2:\n\t"
5214	: "=r" (iBit)
5215	: "rm" (u64));
5216	# else
5217	unsigned iBit = ASMBitFirstSetU32((uint32_t)u64);
5218	if (!iBit)
5219	{
5220	iBit = ASMBitFirstSetU32((uint32_t)(u64 >> 32));
5221	if (iBit)
5222	iBit += 32;
5223	}
5224	# endif
5225	return (unsigned)iBit;
5226	}
5227	#endif
5228
5229
5230	/**
5231	* Finds the first bit which is set in the given 16-bit integer.
5232	*
5233	* Bits are numbered from 1 (least significant) to 16.
5234	*
5235	* @returns index [1..16] of the first set bit.
5236	* @returns 0 if all bits are cleared.
5237	* @param u16 Integer to search for set bits.
5238	* @remarks For 16-bit bs3kit code.
5239	*/
5240	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
5241	DECLASM(unsigned) ASMBitFirstSetU16(uint16_t u16);
5242	#else
5243	DECLINLINE(unsigned) ASMBitFirstSetU16(uint16_t u16)
5244	{
5245	return ASMBitFirstSetU32((uint32_t)u16);
5246	}
5247	#endif
5248
5249
5250	/**
5251	* Finds the last bit which is set in the given 32-bit integer.
5252	* Bits are numbered from 1 (least significant) to 32.
5253	*
5254	* @returns index [1..32] of the last set bit.
5255	* @returns 0 if all bits are cleared.
5256	* @param u32 Integer to search for set bits.
5257	* @remark Similar to fls() in BSD.
5258	*/
5259	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
5260	DECLASM(unsigned) ASMBitLastSetU32(uint32_t u32);
5261	#else
5262	DECLINLINE(unsigned) ASMBitLastSetU32(uint32_t u32)
5263	{
5264	# if RT_INLINE_ASM_USES_INTRIN
5265	unsigned long iBit;
5266	if (_BitScanReverse(&iBit, u32))
5267	iBit++;
5268	else
5269	iBit = 0;
5270	# elif RT_INLINE_ASM_GNU_STYLE
5271	uint32_t iBit;
5272	__asm__ __volatile__("bsrl %1, %0\n\t"
5273	"jnz 1f\n\t"
5274	"xorl %0, %0\n\t"
5275	"jmp 2f\n"
5276	"1:\n\t"
5277	"incl %0\n"
5278	"2:\n\t"
5279	: "=r" (iBit)
5280	: "rm" (u32));
5281	# else
5282	uint32_t iBit;
5283	_asm
5284	{
5285	bsr eax, [u32]
5286	jnz found
5287	xor eax, eax
5288	jmp done
5289	found:
5290	inc eax
5291	done:
5292	mov [iBit], eax
5293	}
5294	# endif
5295	return iBit;
5296	}
5297	#endif
5298
5299
5300	/**
5301	* Finds the last bit which is set in the given 32-bit integer.
5302	* Bits are numbered from 1 (least significant) to 32.
5303	*
5304	* @returns index [1..32] of the last set bit.
5305	* @returns 0 if all bits are cleared.
5306	* @param i32 Integer to search for set bits.
5307	* @remark Similar to fls() in BSD.
5308	*/
5309	DECLINLINE(unsigned) ASMBitLastSetS32(int32_t i32)
5310	{
5311	return ASMBitLastSetU32((uint32_t)i32);
5312	}
5313
5314
5315	/**
5316	* Finds the last bit which is set in the given 64-bit integer.
5317	*
5318	* Bits are numbered from 1 (least significant) to 64.
5319	*
5320	* @returns index [1..64] of the last set bit.
5321	* @returns 0 if all bits are cleared.
5322	* @param u64 Integer to search for set bits.
5323	* @remark Similar to fls() in BSD.
5324	*/
5325	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
5326	DECLASM(unsigned) ASMBitLastSetU64(uint64_t u64);
5327	#else
5328	DECLINLINE(unsigned) ASMBitLastSetU64(uint64_t u64)
5329	{
5330	# if RT_INLINE_ASM_USES_INTRIN
5331	unsigned long iBit;
5332	# if ARCH_BITS == 64
5333	if (_BitScanReverse64(&iBit, u64))
5334	iBit++;
5335	else
5336	iBit = 0;
5337	# else
5338	if (_BitScanReverse(&iBit, (uint32_t)(u64 >> 32)))
5339	iBit += 33;
5340	else if (_BitScanReverse(&iBit, (uint32_t)u64))
5341	iBit++;
5342	else
5343	iBit = 0;
5344	# endif
5345	# elif RT_INLINE_ASM_GNU_STYLE && ARCH_BITS == 64
5346	uint64_t iBit;
5347	__asm__ __volatile__("bsrq %1, %0\n\t"
5348	"jnz 1f\n\t"
5349	"xorl %0, %0\n\t"
5350	"jmp 2f\n"
5351	"1:\n\t"
5352	"incl %0\n"
5353	"2:\n\t"
5354	: "=r" (iBit)
5355	: "rm" (u64));
5356	# else
5357	unsigned iBit = ASMBitLastSetU32((uint32_t)(u64 >> 32));
5358	if (iBit)
5359	iBit += 32;
5360	else
5361	iBit = ASMBitLastSetU32((uint32_t)u64);
5362	#endif
5363	return (unsigned)iBit;
5364	}
5365	#endif
5366
5367
5368	/**
5369	* Finds the last bit which is set in the given 16-bit integer.
5370	*
5371	* Bits are numbered from 1 (least significant) to 16.
5372	*
5373	* @returns index [1..16] of the last set bit.
5374	* @returns 0 if all bits are cleared.
5375	* @param u16 Integer to search for set bits.
5376	* @remarks For 16-bit bs3kit code.
5377	*/
5378	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
5379	DECLASM(unsigned) ASMBitLastSetU16(uint16_t u16);
5380	#else
5381	DECLINLINE(unsigned) ASMBitLastSetU16(uint16_t u16)
5382	{
5383	return ASMBitLastSetU32((uint32_t)u16);
5384	}
5385	#endif
5386
5387
5388	/**
5389	* Reverse the byte order of the given 16-bit integer.
5390	*
5391	* @returns Revert
5392	* @param u16 16-bit integer value.
5393	*/
5394	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
5395	DECLASM(uint16_t) ASMByteSwapU16(uint16_t u16);
5396	#else
5397	DECLINLINE(uint16_t) ASMByteSwapU16(uint16_t u16)
5398	{
5399	# if RT_INLINE_ASM_USES_INTRIN
5400	u16 = _byteswap_ushort(u16);
5401	# elif RT_INLINE_ASM_GNU_STYLE
5402	__asm__ ("rorw $8, %0" : "=r" (u16) : "0" (u16));
5403	# else
5404	_asm
5405	{
5406	mov ax, [u16]
5407	ror ax, 8
5408	mov [u16], ax
5409	}
5410	# endif
5411	return u16;
5412	}
5413	#endif
5414
5415
5416	/**
5417	* Reverse the byte order of the given 32-bit integer.
5418	*
5419	* @returns Revert
5420	* @param u32 32-bit integer value.
5421	*/
5422	#if RT_INLINE_ASM_EXTERNAL && !RT_INLINE_ASM_USES_INTRIN
5423	DECLASM(uint32_t) ASMByteSwapU32(uint32_t u32);
5424	#else
5425	DECLINLINE(uint32_t) ASMByteSwapU32(uint32_t u32)
5426	{
5427	# if RT_INLINE_ASM_USES_INTRIN
5428	u32 = _byteswap_ulong(u32);
5429	# elif RT_INLINE_ASM_GNU_STYLE
5430	__asm__ ("bswapl %0" : "=r" (u32) : "0" (u32));
5431	# else
5432	_asm
5433	{
5434	mov eax, [u32]
5435	bswap eax
5436	mov [u32], eax
5437	}
5438	# endif
5439	return u32;
5440	}
5441	#endif
5442
5443
5444	/**
5445	* Reverse the byte order of the given 64-bit integer.
5446	*
5447	* @returns Revert
5448	* @param u64 64-bit integer value.
5449	*/
5450	DECLINLINE(uint64_t) ASMByteSwapU64(uint64_t u64)
5451	{
5452	#if defined(RT_ARCH_AMD64) && RT_INLINE_ASM_USES_INTRIN
5453	u64 = _byteswap_uint64(u64);
5454	#else
5455	u64 = (uint64_t)ASMByteSwapU32((uint32_t)u64) << 32
5456	\| (uint64_t)ASMByteSwapU32((uint32_t)(u64 >> 32));
5457	#endif
5458	return u64;
5459	}
5460
5461
5462	/**
5463	* Rotate 32-bit unsigned value to the left by @a cShift.
5464	*
5465	* @returns Rotated value.
5466	* @param u32 The value to rotate.
5467	* @param cShift How many bits to rotate by.
5468	*/
5469	#ifdef __WATCOMC__
5470	DECLASM(uint32_t) ASMRotateLeftU32(uint32_t u32, unsigned cShift);
5471	#else
5472	DECLINLINE(uint32_t) ASMRotateLeftU32(uint32_t u32, uint32_t cShift)
5473	{
5474	# if RT_INLINE_ASM_USES_INTRIN
5475	return _rotl(u32, cShift);
5476	# elif RT_INLINE_ASM_GNU_STYLE && (defined(RT_ARCH_AMD64) \|\| defined(RT_ARCH_X86))
5477	__asm__ __volatile__("roll %b1, %0" : "=g" (u32) : "Ic" (cShift), "0" (u32));
5478	return u32;
5479	# else
5480	cShift &= 31;
5481	return (u32 << cShift) \| (u32 >> (32 - cShift));
5482	# endif
5483	}
5484	#endif
5485
5486
5487	/**
5488	* Rotate 32-bit unsigned value to the right by @a cShift.
5489	*
5490	* @returns Rotated value.
5491	* @param u32 The value to rotate.
5492	* @param cShift How many bits to rotate by.
5493	*/
5494	#ifdef __WATCOMC__
5495	DECLASM(uint32_t) ASMRotateRightU32(uint32_t u32, unsigned cShift);
5496	#else
5497	DECLINLINE(uint32_t) ASMRotateRightU32(uint32_t u32, uint32_t cShift)
5498	{
5499	# if RT_INLINE_ASM_USES_INTRIN
5500	return _rotr(u32, cShift);
5501	# elif RT_INLINE_ASM_GNU_STYLE && (defined(RT_ARCH_AMD64) \|\| defined(RT_ARCH_X86))
5502	__asm__ __volatile__("rorl %b1, %0" : "=g" (u32) : "Ic" (cShift), "0" (u32));
5503	return u32;
5504	# else
5505	cShift &= 31;
5506	return (u32 >> cShift) \| (u32 << (32 - cShift));
5507	# endif
5508	}
5509	#endif
5510
5511
5512	/**
5513	* Rotate 64-bit unsigned value to the left by @a cShift.
5514	*
5515	* @returns Rotated value.
5516	* @param u64 The value to rotate.
5517	* @param cShift How many bits to rotate by.
5518	*/
5519	DECLINLINE(uint64_t) ASMRotateLeftU64(uint64_t u64, uint32_t cShift)
5520	{
5521	#if RT_INLINE_ASM_USES_INTRIN
5522	return _rotl64(u64, cShift);
5523	#elif RT_INLINE_ASM_GNU_STYLE && defined(RT_ARCH_AMD64)
5524	__asm__ __volatile__("rolq %b1, %0" : "=g" (u64) : "Jc" (cShift), "0" (u64));
5525	return u64;
5526	#elif RT_INLINE_ASM_GNU_STYLE && defined(RT_ARCH_X86)
5527	uint32_t uSpill;
5528	__asm__ __volatile__("testb $0x20, %%cl\n\t" /* if (cShift >= 0x20) { swap(u64.hi, u64lo); cShift -= 0x20; } */
5529	"jz 1f\n\t"
5530	"xchgl %%eax, %%edx\n\t"
5531	"1:\n\t"
5532	"andb $0x1f, %%cl\n\t" /* if (cShift & 0x1f) { */
5533	"jz 2f\n\t"
5534	"movl %%edx, %2\n\t" /* save the hi value in %3. */
5535	"shldl %%cl,%%eax,%%edx\n\t" /* shift the hi value left, feeding MSBits from the low value. */
5536	"shldl %%cl,%2,%%eax\n\t" /* shift the lo value left, feeding MSBits from the saved hi value. */
5537	"2:\n\t" /* } */
5538	: "=A" (u64), "=c" (cShift), "=r" (uSpill)
5539	: "0" (u64),
5540	"1" (cShift));
5541	return u64;
5542	#else
5543	cShift &= 63;
5544	return (u64 << cShift) \| (u64 >> (64 - cShift));
5545	#endif
5546	}
5547
5548
5549	/**
5550	* Rotate 64-bit unsigned value to the right by @a cShift.
5551	*
5552	* @returns Rotated value.
5553	* @param u64 The value to rotate.
5554	* @param cShift How many bits to rotate by.
5555	*/
5556	DECLINLINE(uint64_t) ASMRotateRightU64(uint64_t u64, uint32_t cShift)
5557	{
5558	#if RT_INLINE_ASM_USES_INTRIN
5559	return _rotr64(u64, cShift);
5560	#elif RT_INLINE_ASM_GNU_STYLE && defined(RT_ARCH_AMD64)
5561	__asm__ __volatile__("rorq %b1, %0" : "=g" (u64) : "Jc" (cShift), "0" (u64));
5562	return u64;
5563	#elif RT_INLINE_ASM_GNU_STYLE && defined(RT_ARCH_X86)
5564	uint32_t uSpill;
5565	__asm__ __volatile__("testb $0x20, %%cl\n\t" /* if (cShift >= 0x20) { swap(u64.hi, u64lo); cShift -= 0x20; } */
5566	"jz 1f\n\t"
5567	"xchgl %%eax, %%edx\n\t"
5568	"1:\n\t"
5569	"andb $0x1f, %%cl\n\t" /* if (cShift & 0x1f) { */
5570	"jz 2f\n\t"
5571	"movl %%edx, %2\n\t" /* save the hi value in %3. */
5572	"shrdl %%cl,%%eax,%%edx\n\t" /* shift the hi value right, feeding LSBits from the low value. */
5573	"shrdl %%cl,%2,%%eax\n\t" /* shift the lo value right, feeding LSBits from the saved hi value. */
5574	"2:\n\t" /* } */
5575	: "=A" (u64), "=c" (cShift), "=r" (uSpill)
5576	: "0" (u64),
5577	"1" (cShift));
5578	return u64;
5579	#else
5580	cShift &= 63;
5581	return (u64 >> cShift) \| (u64 << (64 - cShift));
5582	#endif
5583	}
5584
5585	/** @} */
5586
5587
5588	/** @} */
5589
5590	#endif
5591

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source: vbox/trunk/include/iprt/asm.h@ 62534

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