DevPit-i8254.cpp@ 51898

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1	/* $Id: DevPit-i8254.cpp 48947 2013-10-07 21:41:00Z vboxsync $ */
2	/** @file
3	* DevPIT-i8254 - Intel 8254 Programmable Interval Timer (PIT) And Dummy Speaker Device.
4	*/
5
6	/*
7	* Copyright (C) 2006-2013 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	* --------------------------------------------------------------------
17	*
18	* This code is based on:
19	*
20	* QEMU 8253/8254 interval timer emulation
21	*
22	* Copyright (c) 2003-2004 Fabrice Bellard
23	*
24	* Permission is hereby granted, free of charge, to any person obtaining a copy
25	* of this software and associated documentation files (the "Software"), to deal
26	* in the Software without restriction, including without limitation the rights
27	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
28	* copies of the Software, and to permit persons to whom the Software is
29	* furnished to do so, subject to the following conditions:
30	*
31	* The above copyright notice and this permission notice shall be included in
32	* all copies or substantial portions of the Software.
33	*
34	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
35	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
36	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
37	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
38	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
39	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
40	* THE SOFTWARE.
41	*/
42
43	/*******************************************************************************
44	* Header Files *
45	*******************************************************************************/
46	#define LOG_GROUP LOG_GROUP_DEV_PIT
47	#include <VBox/vmm/pdmdev.h>
48	#include <VBox/log.h>
49	#include <VBox/vmm/stam.h>
50	#include <iprt/assert.h>
51	#include <iprt/asm-math.h>
52
53	#ifdef IN_RING3
54	# include <iprt/alloc.h>
55	# include <iprt/string.h>
56	# include <iprt/uuid.h>
57	#endif /* IN_RING3 */
58
59	#include "VBoxDD.h"
60
61
62	/*******************************************************************************
63	* Defined Constants And Macros *
64	*******************************************************************************/
65	/** The PIT frequency. */
66	#define PIT_FREQ 1193182
67
68	#define RW_STATE_LSB 1
69	#define RW_STATE_MSB 2
70	#define RW_STATE_WORD0 3
71	#define RW_STATE_WORD1 4
72
73	/** The current saved state version. */
74	#define PIT_SAVED_STATE_VERSION 4
75	/** The saved state version used by VirtualBox 3.1 and earlier.
76	* This did not include disable by HPET flag. */
77	#define PIT_SAVED_STATE_VERSION_VBOX_31 3
78	/** The saved state version used by VirtualBox 3.0 and earlier.
79	* This did not include the config part. */
80	#define PIT_SAVED_STATE_VERSION_VBOX_30 2
81
82	/** @def FAKE_REFRESH_CLOCK
83	* Define this to flip the 15usec refresh bit on every read.
84	* If not defined, it will be flipped correctly. */
85	/* #define FAKE_REFRESH_CLOCK */
86	#ifdef DOXYGEN_RUNNING
87	# define FAKE_REFRESH_CLOCK
88	#endif
89
90	/** The effective counter mode - if bit 1 is set, bit 2 is ignored. */
91	#define EFFECTIVE_MODE(x) ((x) & ~(((x) & 2) << 1))
92
93
94	/**
95	* Acquires the PIT lock or returns.
96	*/
97	#define DEVPIT_LOCK_RETURN(a_pThis, a_rcBusy) \
98	do { \
99	int rcLock = PDMCritSectEnter(&(a_pThis)->CritSect, (a_rcBusy)); \
100	if (rcLock != VINF_SUCCESS) \
101	return rcLock; \
102	} while (0)
103
104	/**
105	* Releases the PIT lock.
106	*/
107	#define DEVPIT_UNLOCK(a_pThis) \
108	do { PDMCritSectLeave(&(a_pThis)->CritSect); } while (0)
109
110
111	/**
112	* Acquires the TM lock and PIT lock, returns on failure.
113	*/
114	#define DEVPIT_LOCK_BOTH_RETURN(a_pThis, a_rcBusy) \
115	do { \
116	int rcLock = TMTimerLock((a_pThis)->channels[0].CTX_SUFF(pTimer), (a_rcBusy)); \
117	if (rcLock != VINF_SUCCESS) \
118	return rcLock; \
119	rcLock = PDMCritSectEnter(&(a_pThis)->CritSect, (a_rcBusy)); \
120	if (rcLock != VINF_SUCCESS) \
121	{ \
122	TMTimerUnlock((a_pThis)->channels[0].CTX_SUFF(pTimer)); \
123	return rcLock; \
124	} \
125	} while (0)
126
127	#if IN_RING3
128	/**
129	* Acquires the TM lock and PIT lock, ignores failures.
130	*/
131	# define DEVPIT_R3_LOCK_BOTH(a_pThis) \
132	do { \
133	TMTimerLock((a_pThis)->channels[0].CTX_SUFF(pTimer), VERR_IGNORED); \
134	PDMCritSectEnter(&(a_pThis)->CritSect, VERR_IGNORED); \
135	} while (0)
136	#endif /* IN_RING3 */
137
138	/**
139	* Releases the PIT lock and TM lock.
140	*/
141	#define DEVPIT_UNLOCK_BOTH(a_pThis) \
142	do { \
143	PDMCritSectLeave(&(a_pThis)->CritSect); \
144	TMTimerUnlock((a_pThis)->channels[0].CTX_SUFF(pTimer)); \
145	} while (0)
146
147
148
149	/*******************************************************************************
150	* Structures and Typedefs *
151	*******************************************************************************/
152	/**
153	* The state of one PIT channel.
154	*/
155	typedef struct PITCHANNEL
156	{
157	/** Pointer to the instance data - R3 Ptr. */
158	R3PTRTYPE(struct PITSTATE *) pPitR3;
159	/** The timer - R3 Ptr.
160	* @note Only channel 0 has a timer. */
161	PTMTIMERR3 pTimerR3;
162	/** Pointer to the instance data - R0 Ptr. */
163	R0PTRTYPE(struct PITSTATE *) pPitR0;
164	/** The timer - R0 Ptr.
165	* @note Only channel 0 has a timer. */
166	PTMTIMERR0 pTimerR0;
167	/** Pointer to the instance data - RC Ptr. */
168	RCPTRTYPE(struct PITSTATE *) pPitRC;
169	/** The timer - RC Ptr.
170	* @note Only channel 0 has a timer. */
171	PTMTIMERRC pTimerRC;
172	/** The virtual time stamp at the last reload. (only used in mode 2 for now) */
173	uint64_t u64ReloadTS;
174	/** The actual time of the next tick.
175	* As apposed to the next_transition_time which contains the correct time of the next tick. */
176	uint64_t u64NextTS;
177
178	/** (count_load_time is only set by TMTimerGet() which returns uint64_t) */
179	uint64_t count_load_time;
180	/* irq handling */
181	int64_t next_transition_time;
182	int32_t irq;
183	/** Number of release log entries. Used to prevent flooding. */
184	uint32_t cRelLogEntries;
185
186	uint32_t count; /* can be 65536 */
187	uint16_t latched_count;
188	uint8_t count_latched;
189	uint8_t status_latched;
190
191	uint8_t status;
192	uint8_t read_state;
193	uint8_t write_state;
194	uint8_t write_latch;
195
196	uint8_t rw_mode;
197	uint8_t mode;
198	uint8_t bcd; /* not supported */
199	uint8_t gate; /* timer start */
200
201	} PITCHANNEL;
202	/** Pointer to the state of one PIT channel. */
203	typedef PITCHANNEL *PPITCHANNEL;
204
205	/**
206	* The whole PIT state.
207	*/
208	typedef struct PITSTATE
209	{
210	/** Channel state. Must come first? */
211	PITCHANNEL channels[3];
212	/** Speaker data. */
213	int32_t speaker_data_on;
214	#ifdef FAKE_REFRESH_CLOCK
215	/** Speaker dummy. */
216	int32_t dummy_refresh_clock;
217	#else
218	uint32_t Alignment1;
219	#endif
220	/** Config: I/O port base. */
221	RTIOPORT IOPortBaseCfg;
222	/** Config: Speaker enabled. */
223	bool fSpeakerCfg;
224	bool fDisabledByHpet;
225	bool afAlignment0[HC_ARCH_BITS == 32 ? 4 : 4];
226	/** PIT port interface. */
227	PDMIHPETLEGACYNOTIFY IHpetLegacyNotify;
228	/** Pointer to the device instance. */
229	PPDMDEVINSR3 pDevIns;
230	/** Number of IRQs that's been raised. */
231	STAMCOUNTER StatPITIrq;
232	/** Profiling the timer callback handler. */
233	STAMPROFILEADV StatPITHandler;
234	/** Critical section protecting the state. */
235	PDMCRITSECT CritSect;
236	} PITSTATE;
237	/** Pointer to the PIT device state. */
238	typedef PITSTATE *PPITSTATE;
239
240
241	#ifndef VBOX_DEVICE_STRUCT_TESTCASE
242	/*******************************************************************************
243	* Internal Functions *
244	*******************************************************************************/
245	#ifdef IN_RING3
246	static void pit_irq_timer_update(PPITCHANNEL pChan, uint64_t current_time, uint64_t now, bool in_timer);
247	#endif
248
249
250
251	static int pit_get_count(PPITCHANNEL pChan)
252	{
253	uint64_t d;
254	PTMTIMER pTimer = pChan->CTX_SUFF(pPit)->channels[0].CTX_SUFF(pTimer);
255	Assert(TMTimerIsLockOwner(pTimer));
256
257	if (EFFECTIVE_MODE(pChan->mode) == 2)
258	{
259	if (pChan->u64NextTS == UINT64_MAX)
260	{
261	d = ASMMultU64ByU32DivByU32(TMTimerGet(pTimer) - pChan->count_load_time, PIT_FREQ, TMTimerGetFreq(pTimer));
262	return pChan->count - (d % pChan->count); /** @todo check this value. */
263	}
264	uint64_t Interval = pChan->u64NextTS - pChan->u64ReloadTS;
265	if (!Interval)
266	return pChan->count - 1; /** @todo This is WRONG! But I'm too tired to fix it properly and just want to shut up a DIV/0 trap now. */
267	d = TMTimerGet(pTimer);
268	d = ASMMultU64ByU32DivByU32(d - pChan->u64ReloadTS, pChan->count, Interval);
269	if (d >= pChan->count)
270	return 1;
271	return pChan->count - d;
272	}
273
274	d = ASMMultU64ByU32DivByU32(TMTimerGet(pTimer) - pChan->count_load_time, PIT_FREQ, TMTimerGetFreq(pTimer));
275	int counter;
276	switch (EFFECTIVE_MODE(pChan->mode))
277	{
278	case 0:
279	case 1:
280	case 4:
281	case 5:
282	counter = (pChan->count - d) & 0xffff;
283	break;
284	case 3:
285	/* XXX: may be incorrect for odd counts */
286	counter = pChan->count - ((2 * d) % pChan->count);
287	break;
288	default:
289	counter = pChan->count - (d % pChan->count);
290	break;
291	}
292	/** @todo check that we don't return 0, in most modes (all?) the counter shouldn't be zero. */
293	return counter;
294	}
295
296	/* get pit output bit */
297	static int pit_get_out1(PPITCHANNEL pChan, int64_t current_time)
298	{
299	PTMTIMER pTimer = pChan->CTX_SUFF(pPit)->channels[0].CTX_SUFF(pTimer);
300	uint64_t d;
301	int out;
302
303	d = ASMMultU64ByU32DivByU32(current_time - pChan->count_load_time, PIT_FREQ, TMTimerGetFreq(pTimer));
304	switch (EFFECTIVE_MODE(pChan->mode))
305	{
306	default:
307	case 0:
308	out = (d >= pChan->count);
309	break;
310	case 1:
311	out = (d < pChan->count);
312	break;
313	case 2:
314	Log2(("pit_get_out1: d=%llx c=%x %x \n", d, pChan->count, (unsigned)(d % pChan->count)));
315	if ((d % pChan->count) == 0 && d != 0)
316	out = 1;
317	else
318	out = 0;
319	break;
320	case 3:
321	out = (d % pChan->count) < ((pChan->count + 1) >> 1);
322	break;
323	case 4:
324	case 5:
325	out = (d != pChan->count);
326	break;
327	}
328	return out;
329	}
330
331
332	static int pit_get_out(PPITSTATE pThis, int channel, int64_t current_time)
333	{
334	PPITCHANNEL pChan = &pThis->channels[channel];
335	return pit_get_out1(pChan, current_time);
336	}
337
338
339	static int pit_get_gate(PPITSTATE pThis, int channel)
340	{
341	PPITCHANNEL pChan = &pThis->channels[channel];
342	return pChan->gate;
343	}
344
345
346	/* if already latched, do not latch again */
347	static void pit_latch_count(PPITCHANNEL pChan)
348	{
349	if (!pChan->count_latched)
350	{
351	pChan->latched_count = pit_get_count(pChan);
352	pChan->count_latched = pChan->rw_mode;
353	LogFlow(("pit_latch_count: latched_count=%#06x / %10RU64 ns (c=%#06x m=%d)\n",
354	pChan->latched_count, ASMMultU64ByU32DivByU32(pChan->count - pChan->latched_count, 1000000000, PIT_FREQ),
355	pChan->count, pChan->mode));
356	}
357	}
358
359	#ifdef IN_RING3
360
361	/* val must be 0 or 1 */
362	static void pit_set_gate(PPITSTATE pThis, int channel, int val)
363	{
364	PPITCHANNEL pChan = &pThis->channels[channel];
365	PTMTIMER pTimer = pChan->CTX_SUFF(pPit)->channels[0].CTX_SUFF(pTimer);
366
367	Assert((val & 1) == val);
368	Assert(TMTimerIsLockOwner(pTimer));
369
370	switch (EFFECTIVE_MODE(pChan->mode))
371	{
372	default:
373	case 0:
374	case 4:
375	/* XXX: just disable/enable counting */
376	break;
377	case 1:
378	case 5:
379	if (pChan->gate < val)
380	{
381	/* restart counting on rising edge */
382	Log(("pit_set_gate: restarting mode %d\n", pChan->mode));
383	pChan->count_load_time = TMTimerGet(pTimer);
384	pit_irq_timer_update(pChan, pChan->count_load_time, pChan->count_load_time, false);
385	}
386	break;
387	case 2:
388	case 3:
389	if (pChan->gate < val)
390	{
391	/* restart counting on rising edge */
392	Log(("pit_set_gate: restarting mode %d\n", pChan->mode));
393	pChan->count_load_time = pChan->u64ReloadTS = TMTimerGet(pTimer);
394	pit_irq_timer_update(pChan, pChan->count_load_time, pChan->count_load_time, false);
395	}
396	/* XXX: disable/enable counting */
397	break;
398	}
399	pChan->gate = val;
400	}
401
402	static void pit_load_count(PPITCHANNEL pChan, int val)
403	{
404	PTMTIMER pTimer = pChan->CTX_SUFF(pPit)->channels[0].CTX_SUFF(pTimer);
405	Assert(TMTimerIsLockOwner(pTimer));
406
407	if (val == 0)
408	val = 0x10000;
409	pChan->count_load_time = pChan->u64ReloadTS = TMTimerGet(pTimer);
410	pChan->count = val;
411	pit_irq_timer_update(pChan, pChan->count_load_time, pChan->count_load_time, false);
412
413	/* log the new rate (ch 0 only). */
414	if (pChan->pTimerR3 /* ch 0 */)
415	{
416	if (pChan->cRelLogEntries++ < 32)
417	LogRel(("PIT: mode=%d count=%#x (%u) - %d.%02d Hz (ch=0)\n",
418	pChan->mode, pChan->count, pChan->count, PIT_FREQ / pChan->count, (PIT_FREQ * 100 / pChan->count) % 100));
419	else
420	Log(("PIT: mode=%d count=%#x (%u) - %d.%02d Hz (ch=0)\n",
421	pChan->mode, pChan->count, pChan->count, PIT_FREQ / pChan->count, (PIT_FREQ * 100 / pChan->count) % 100));
422	TMTimerSetFrequencyHint(pChan->CTX_SUFF(pTimer), PIT_FREQ / pChan->count);
423	}
424	else
425	Log(("PIT: mode=%d count=%#x (%u) - %d.%02d Hz (ch=%d)\n",
426	pChan->mode, pChan->count, pChan->count, PIT_FREQ / pChan->count, (PIT_FREQ * 100 / pChan->count) % 100,
427	pChan - &pChan->CTX_SUFF(pPit)->channels[0]));
428	}
429
430	/* return -1 if no transition will occur. */
431	static int64_t pit_get_next_transition_time(PPITCHANNEL pChan, uint64_t current_time)
432	{
433	PTMTIMER pTimer = pChan->CTX_SUFF(pPit)->channels[0].CTX_SUFF(pTimer);
434	uint64_t d, next_time, base;
435	uint32_t period2;
436
437	d = ASMMultU64ByU32DivByU32(current_time - pChan->count_load_time, PIT_FREQ, TMTimerGetFreq(pTimer));
438	switch(EFFECTIVE_MODE(pChan->mode))
439	{
440	default:
441	case 0:
442	case 1:
443	if (d < pChan->count)
444	next_time = pChan->count;
445	else
446	return -1;
447	break;
448
449	/*
450	* Mode 2: The period is 'count' PIT ticks.
451	* When the counter reaches 1 we set the output low (for channel 0 that
452	* means lowering IRQ0). On the next tick, where we should be decrementing
453	* from 1 to 0, the count is loaded and the output goes high (channel 0
454	* means raising IRQ0 again and triggering timer interrupt).
455	*
456	* In VirtualBox we compress the pulse and flip-flop the IRQ line at the
457	* end of the period, which signals an interrupt at the exact same time.
458	*/
459	case 2:
460	base = (d / pChan->count) * pChan->count;
461	#ifndef VBOX /* see above */
462	if ((d - base) == 0 && d != 0)
463	next_time = base + pChan->count - 1;
464	else
465	#endif
466	next_time = base + pChan->count;
467	break;
468	case 3:
469	base = (d / pChan->count) * pChan->count;
470	period2 = ((pChan->count + 1) >> 1);
471	if ((d - base) < period2)
472	next_time = base + period2;
473	else
474	next_time = base + pChan->count;
475	break;
476
477	/* Modes 4 and 5 generate a short pulse at the end of the time delay. This
478	* is similar to mode 2, except modes 4/5 aren't periodic. We use the same
479	* optimization - only use one timer callback and pulse the IRQ.
480	* Note: Tickless Linux kernels use PIT mode 4 with 'nolapic'.
481	*/
482	case 4:
483	case 5:
484	#ifdef VBOX
485	if (d <= pChan->count)
486	next_time = pChan->count;
487	#else
488	if (d < pChan->count)
489	next_time = pChan->count;
490	else if (d == pChan->count)
491	next_time = pChan->count + 1;
492	#endif
493	else
494	return -1;
495	break;
496	}
497
498	/* convert to timer units */
499	LogFlow(("PIT: next_time=%'14RU64 %'20RU64 mode=%#x count=%#06x\n", next_time,
500	ASMMultU64ByU32DivByU32(next_time, TMTimerGetFreq(pTimer), PIT_FREQ), pChan->mode, pChan->count));
501	next_time = pChan->count_load_time + ASMMultU64ByU32DivByU32(next_time, TMTimerGetFreq(pTimer), PIT_FREQ);
502
503	/* fix potential rounding problems */
504	if (next_time <= current_time)
505	next_time = current_time;
506
507	/* Add one to next_time; if we don't, integer truncation will cause
508	* the algorithm to think that at the end of each period, it'pChan still
509	* within the first one instead of at the beginning of the next one.
510	*/
511	return next_time + 1;
512	}
513
514	static void pit_irq_timer_update(PPITCHANNEL pChan, uint64_t current_time, uint64_t now, bool in_timer)
515	{
516	int64_t expire_time;
517	int irq_level;
518	PTMTIMER pTimer = pChan->CTX_SUFF(pPit)->channels[0].CTX_SUFF(pTimer);
519	Assert(TMTimerIsLockOwner(pTimer));
520
521	if (!pChan->CTX_SUFF(pTimer))
522	return;
523	expire_time = pit_get_next_transition_time(pChan, current_time);
524	irq_level = pit_get_out1(pChan, current_time) ? PDM_IRQ_LEVEL_HIGH : PDM_IRQ_LEVEL_LOW;
525
526	/* If PIT is disabled by HPET - simply disconnect ticks from interrupt controllers,
527	* but do not modify other aspects of device operation.
528	*/
529	if (!pChan->pPitR3->fDisabledByHpet)
530	{
531	PPDMDEVINS pDevIns = pChan->CTX_SUFF(pPit)->pDevIns;
532
533	switch (EFFECTIVE_MODE(pChan->mode))
534	{
535	case 2:
536	case 4:
537	case 5:
538	/* We just flip-flop the IRQ line to save an extra timer call,
539	* which isn't generally required. However, the pulse is only
540	* generated when running on the timer callback (and thus on
541	* the trailing edge of the output signal pulse).
542	*/
543	if (in_timer)
544	{
545	PDMDevHlpISASetIrq(pDevIns, pChan->irq, PDM_IRQ_LEVEL_FLIP_FLOP);
546	break;
547	}
548	/* Else fall through! */
549	default:
550	PDMDevHlpISASetIrq(pDevIns, pChan->irq, irq_level);
551	break;
552	}
553	}
554
555	if (irq_level)
556	{
557	pChan->u64ReloadTS = now;
558	STAM_COUNTER_INC(&pChan->CTX_SUFF(pPit)->StatPITIrq);
559	}
560
561	if (expire_time != -1)
562	{
563	Log3(("pit_irq_timer_update: next=%'RU64 now=%'RU64\n", expire_time, now));
564	pChan->u64NextTS = expire_time;
565	TMTimerSet(pChan->CTX_SUFF(pTimer), pChan->u64NextTS);
566	}
567	else
568	{
569	LogFlow(("PIT: m=%d count=%#4x irq_level=%#x stopped\n", pChan->mode, pChan->count, irq_level));
570	TMTimerStop(pChan->CTX_SUFF(pTimer));
571	pChan->u64NextTS = UINT64_MAX;
572	}
573	pChan->next_transition_time = expire_time;
574	}
575
576	#endif /* IN_RING3 */
577
578
579	/**
580	* @callback_method_impl{FNIOMIOPORTIN}
581	*/
582	PDMBOTHCBDECL(int) pitIOPortRead(PPDMDEVINS pDevIns, void pvUser, RTIOPORT Port, uint32_t pu32, unsigned cb)
583	{
584	Log2(("pitIOPortRead: Port=%#x cb=%x\n", Port, cb));
585	NOREF(pvUser);
586	Port &= 3;
587	if (cb != 1 \|\| Port == 3)
588	{
589	Log(("pitIOPortRead: Port=%#x cb=%x *pu32=unused!\n", Port, cb));
590	return VERR_IOM_IOPORT_UNUSED;
591	}
592
593	PPITSTATE pThis = PDMINS_2_DATA(pDevIns, PPITSTATE);
594	PPITCHANNEL pChan = &pThis->channels[Port];
595	int ret;
596
597	DEVPIT_LOCK_RETURN(pThis, VINF_IOM_R3_IOPORT_READ);
598	if (pChan->status_latched)
599	{
600	pChan->status_latched = 0;
601	ret = pChan->status;
602	DEVPIT_UNLOCK(pThis);
603	}
604	else if (pChan->count_latched)
605	{
606	switch (pChan->count_latched)
607	{
608	default:
609	case RW_STATE_LSB:
610	ret = pChan->latched_count & 0xff;
611	pChan->count_latched = 0;
612	break;
613	case RW_STATE_MSB:
614	ret = pChan->latched_count >> 8;
615	pChan->count_latched = 0;
616	break;
617	case RW_STATE_WORD0:
618	ret = pChan->latched_count & 0xff;
619	pChan->count_latched = RW_STATE_MSB;
620	break;
621	}
622	DEVPIT_UNLOCK(pThis);
623	}
624	else
625	{
626	DEVPIT_UNLOCK(pThis);
627	DEVPIT_LOCK_BOTH_RETURN(pThis, VINF_IOM_R3_IOPORT_READ);
628	int count;
629	switch (pChan->read_state)
630	{
631	default:
632	case RW_STATE_LSB:
633	count = pit_get_count(pChan);
634	ret = count & 0xff;
635	break;
636	case RW_STATE_MSB:
637	count = pit_get_count(pChan);
638	ret = (count >> 8) & 0xff;
639	break;
640	case RW_STATE_WORD0:
641	count = pit_get_count(pChan);
642	ret = count & 0xff;
643	pChan->read_state = RW_STATE_WORD1;
644	break;
645	case RW_STATE_WORD1:
646	count = pit_get_count(pChan);
647	ret = (count >> 8) & 0xff;
648	pChan->read_state = RW_STATE_WORD0;
649	break;
650	}
651	DEVPIT_UNLOCK_BOTH(pThis);
652	}
653
654	*pu32 = ret;
655	Log2(("pitIOPortRead: Port=%#x cb=%x pu32=%#04x\n", Port, cb, pu32));
656	return VINF_SUCCESS;
657	}
658
659
660	/**
661	* @callback_method_impl{FNIOMIOPORTOUT}
662	*/
663	PDMBOTHCBDECL(int) pitIOPortWrite(PPDMDEVINS pDevIns, void *pvUser, RTIOPORT Port, uint32_t u32, unsigned cb)
664	{
665	Log2(("pitIOPortWrite: Port=%#x cb=%x u32=%#04x\n", Port, cb, u32));
666	NOREF(pvUser);
667	if (cb != 1)
668	return VINF_SUCCESS;
669
670	PPITSTATE pThis = PDMINS_2_DATA(pDevIns, PPITSTATE);
671	Port &= 3;
672	if (Port == 3)
673	{
674	/*
675	* Port 43h - Mode/Command Register.
676	* 7 6 5 4 3 2 1 0
677	* * * . . . . . . Select channel: 0 0 = Channel 0
678	* 0 1 = Channel 1
679	* 1 0 = Channel 2
680	* 1 1 = Read-back command (8254 only)
681	* (Illegal on 8253)
682	* (Illegal on PS/2 {JAM})
683	* . . * * . . . . Command/Access mode: 0 0 = Latch count value command
684	* 0 1 = Access mode: lobyte only
685	* 1 0 = Access mode: hibyte only
686	* 1 1 = Access mode: lobyte/hibyte
687	* . . . . * * * . Operating mode: 0 0 0 = Mode 0, 0 0 1 = Mode 1,
688	* 0 1 0 = Mode 2, 0 1 1 = Mode 3,
689	* 1 0 0 = Mode 4, 1 0 1 = Mode 5,
690	* 1 1 0 = Mode 2, 1 1 1 = Mode 3
691	* . . . . . . . * BCD/Binary mode: 0 = 16-bit binary, 1 = four-digit BCD
692	*/
693	unsigned channel = u32 >> 6;
694	if (channel == 3)
695	{
696	/* read-back command */
697	DEVPIT_LOCK_BOTH_RETURN(pThis, VINF_IOM_R3_IOPORT_WRITE);
698	for (channel = 0; channel < RT_ELEMENTS(pThis->channels); channel++)
699	{
700	PPITCHANNEL pChan = &pThis->channels[channel];
701	if (u32 & (2 << channel)) {
702	if (!(u32 & 0x20))
703	pit_latch_count(pChan);
704	if (!(u32 & 0x10) && !pChan->status_latched)
705	{
706	/* status latch */
707	/* XXX: add BCD and null count */
708	PTMTIMER pTimer = pChan->CTX_SUFF(pPit)->channels[0].CTX_SUFF(pTimer);
709	pChan->status = (pit_get_out1(pChan, TMTimerGet(pTimer)) << 7)
710	\| (pChan->rw_mode << 4)
711	\| (pChan->mode << 1)
712	\| pChan->bcd;
713	pChan->status_latched = 1;
714	}
715	}
716	}
717	DEVPIT_UNLOCK_BOTH(pThis);
718	}
719	else
720	{
721	PPITCHANNEL pChan = &pThis->channels[channel];
722	unsigned access = (u32 >> 4) & 3;
723	if (access == 0)
724	{
725	DEVPIT_LOCK_BOTH_RETURN(pThis, VINF_IOM_R3_IOPORT_WRITE);
726	pit_latch_count(pChan);
727	DEVPIT_UNLOCK_BOTH(pThis);
728	}
729	else
730	{
731	DEVPIT_LOCK_RETURN(pThis, VINF_IOM_R3_IOPORT_WRITE);
732	pChan->rw_mode = access;
733	pChan->read_state = access;
734	pChan->write_state = access;
735
736	pChan->mode = (u32 >> 1) & 7;
737	pChan->bcd = u32 & 1;
738	/* XXX: update irq timer ? */
739	DEVPIT_UNLOCK(pThis);
740	}
741	}
742	}
743	else
744	{
745	#ifndef IN_RING3
746	/** @todo There is no reason not to do this in all contexts these
747	* days... */
748	return VINF_IOM_R3_IOPORT_WRITE;
749	#else /* IN_RING3 */
750	/*
751	* Port 40-42h - Channel Data Ports.
752	*/
753	PPITCHANNEL pChan = &pThis->channels[Port];
754	uint8_t const write_state = pChan->write_state;
755	DEVPIT_LOCK_BOTH_RETURN(pThis, VINF_IOM_R3_IOPORT_WRITE);
756	switch (pChan->write_state)
757	{
758	default:
759	case RW_STATE_LSB:
760	pit_load_count(pChan, u32);
761	break;
762	case RW_STATE_MSB:
763	pit_load_count(pChan, u32 << 8);
764	break;
765	case RW_STATE_WORD0:
766	pChan->write_latch = u32;
767	pChan->write_state = RW_STATE_WORD1;
768	break;
769	case RW_STATE_WORD1:
770	pit_load_count(pChan, pChan->write_latch \| (u32 << 8));
771	pChan->write_state = RW_STATE_WORD0;
772	break;
773	}
774	DEVPIT_UNLOCK_BOTH(pThis);
775	#endif /* !IN_RING3 */
776	}
777	return VINF_SUCCESS;
778	}
779
780
781	/**
782	* @callback_method_impl{FNIOMIOPORTIN, Speaker}
783	*/
784	PDMBOTHCBDECL(int) pitIOPortSpeakerRead(PPDMDEVINS pDevIns, void pvUser, RTIOPORT Port, uint32_t pu32, unsigned cb)
785	{
786	NOREF(pvUser);
787	if (cb == 1)
788	{
789	PPITSTATE pThis = PDMINS_2_DATA(pDevIns, PPITSTATE);
790	DEVPIT_LOCK_BOTH_RETURN(pThis, VINF_IOM_R3_IOPORT_READ);
791
792	const uint64_t u64Now = TMTimerGet(pThis->channels[0].CTX_SUFF(pTimer));
793	Assert(TMTimerGetFreq(pThis->channels[0].CTX_SUFF(pTimer)) == 1000000000); /* lazy bird. */
794
795	/* bit 6,7 Parity error stuff. */
796	/* bit 5 - mirrors timer 2 output condition. */
797	const int fOut = pit_get_out(pThis, 2, u64Now);
798	/* bit 4 - toggled with each (DRAM?) refresh request, every 15.085 µpChan.
799	ASSUMES ns timer freq, see assertion above. */
800	#ifndef FAKE_REFRESH_CLOCK
801	const int fRefresh = (u64Now / 15085) & 1;
802	#else
803	pThis->dummy_refresh_clock ^= 1;
804	const int fRefresh = pThis->dummy_refresh_clock;
805	#endif
806	/* bit 2,3 NMI / parity status stuff. */
807	/* bit 1 - speaker data status */
808	const int fSpeakerStatus = pThis->speaker_data_on;
809	/* bit 0 - timer 2 clock gate to speaker status. */
810	const int fTimer2GateStatus = pit_get_gate(pThis, 2);
811
812	DEVPIT_UNLOCK_BOTH(pThis);
813
814	*pu32 = fTimer2GateStatus
815	\| (fSpeakerStatus << 1)
816	\| (fRefresh << 4)
817	\| (fOut << 5);
818	Log(("pitIOPortSpeakerRead: Port=%#x cb=%x pu32=%#x\n", Port, cb, pu32));
819	return VINF_SUCCESS;
820	}
821	Log(("pitIOPortSpeakerRead: Port=%#x cb=%x *pu32=unused!\n", Port, cb));
822	return VERR_IOM_IOPORT_UNUSED;
823	}
824
825	#ifdef IN_RING3
826
827	/**
828	* @callback_method_impl{FNIOMIOPORTOUT, Speaker}
829	*/
830	PDMBOTHCBDECL(int) pitIOPortSpeakerWrite(PPDMDEVINS pDevIns, void *pvUser, RTIOPORT Port, uint32_t u32, unsigned cb)
831	{
832	NOREF(pvUser);
833	if (cb == 1)
834	{
835	PPITSTATE pThis = PDMINS_2_DATA(pDevIns, PPITSTATE);
836	DEVPIT_LOCK_BOTH_RETURN(pThis, VERR_IGNORED);
837
838	pThis->speaker_data_on = (u32 >> 1) & 1;
839	pit_set_gate(pThis, 2, u32 & 1);
840
841	DEVPIT_UNLOCK_BOTH(pThis);
842	}
843	Log(("pitIOPortSpeakerWrite: Port=%#x cb=%x u32=%#x\n", Port, cb, u32));
844	return VINF_SUCCESS;
845	}
846
847
848	/* -=-=-=-=-=- Saved state -=-=-=-=-=- */
849
850	/**
851	* @callback_method_impl{FNSSMDEVLIVEEXEC}
852	*/
853	static DECLCALLBACK(int) pitLiveExec(PPDMDEVINS pDevIns, PSSMHANDLE pSSM, uint32_t uPass)
854	{
855	PPITSTATE pThis = PDMINS_2_DATA(pDevIns, PPITSTATE);
856	SSMR3PutIOPort(pSSM, pThis->IOPortBaseCfg);
857	SSMR3PutU8( pSSM, pThis->channels[0].irq);
858	SSMR3PutBool( pSSM, pThis->fSpeakerCfg);
859	return VINF_SSM_DONT_CALL_AGAIN;
860	}
861
862
863	/**
864	* @callback_method_impl{FNSSMDEVSAVEEXEC}
865	*/
866	static DECLCALLBACK(int) pitSaveExec(PPDMDEVINS pDevIns, PSSMHANDLE pSSM)
867	{
868	PPITSTATE pThis = PDMINS_2_DATA(pDevIns, PPITSTATE);
869	PDMCritSectEnter(&pThis->CritSect, VERR_IGNORED);
870
871	/* The config. */
872	pitLiveExec(pDevIns, pSSM, SSM_PASS_FINAL);
873
874	/* The state. */
875	for (unsigned i = 0; i < RT_ELEMENTS(pThis->channels); i++)
876	{
877	PPITCHANNEL pChan = &pThis->channels[i];
878	SSMR3PutU32(pSSM, pChan->count);
879	SSMR3PutU16(pSSM, pChan->latched_count);
880	SSMR3PutU8(pSSM, pChan->count_latched);
881	SSMR3PutU8(pSSM, pChan->status_latched);
882	SSMR3PutU8(pSSM, pChan->status);
883	SSMR3PutU8(pSSM, pChan->read_state);
884	SSMR3PutU8(pSSM, pChan->write_state);
885	SSMR3PutU8(pSSM, pChan->write_latch);
886	SSMR3PutU8(pSSM, pChan->rw_mode);
887	SSMR3PutU8(pSSM, pChan->mode);
888	SSMR3PutU8(pSSM, pChan->bcd);
889	SSMR3PutU8(pSSM, pChan->gate);
890	SSMR3PutU64(pSSM, pChan->count_load_time);
891	SSMR3PutU64(pSSM, pChan->u64NextTS);
892	SSMR3PutU64(pSSM, pChan->u64ReloadTS);
893	SSMR3PutS64(pSSM, pChan->next_transition_time);
894	if (pChan->CTX_SUFF(pTimer))
895	TMR3TimerSave(pChan->CTX_SUFF(pTimer), pSSM);
896	}
897
898	SSMR3PutS32(pSSM, pThis->speaker_data_on);
899	#ifdef FAKE_REFRESH_CLOCK
900	SSMR3PutS32(pSSM, pThis->dummy_refresh_clock);
901	#else
902	SSMR3PutS32(pSSM, 0);
903	#endif
904
905	SSMR3PutBool(pSSM, pThis->fDisabledByHpet);
906
907	PDMCritSectLeave(&pThis->CritSect);
908	return VINF_SUCCESS;
909	}
910
911
912	/**
913	* @callback_method_impl{FNSSMDEVLOADEXEC}
914	*/
915	static DECLCALLBACK(int) pitLoadExec(PPDMDEVINS pDevIns, PSSMHANDLE pSSM, uint32_t uVersion, uint32_t uPass)
916	{
917	PPITSTATE pThis = PDMINS_2_DATA(pDevIns, PPITSTATE);
918	int rc;
919
920	if ( uVersion != PIT_SAVED_STATE_VERSION
921	&& uVersion != PIT_SAVED_STATE_VERSION_VBOX_30
922	&& uVersion != PIT_SAVED_STATE_VERSION_VBOX_31)
923	return VERR_SSM_UNSUPPORTED_DATA_UNIT_VERSION;
924
925	/* The config. */
926	if (uVersion > PIT_SAVED_STATE_VERSION_VBOX_30)
927	{
928	RTIOPORT IOPortBaseCfg;
929	rc = SSMR3GetIOPort(pSSM, &IOPortBaseCfg); AssertRCReturn(rc, rc);
930	if (IOPortBaseCfg != pThis->IOPortBaseCfg)
931	return SSMR3SetCfgError(pSSM, RT_SRC_POS, N_("Config mismatch - IOPortBaseCfg: saved=%RTiop config=%RTiop"),
932	IOPortBaseCfg, pThis->IOPortBaseCfg);
933
934	uint8_t u8Irq;
935	rc = SSMR3GetU8(pSSM, &u8Irq); AssertRCReturn(rc, rc);
936	if (u8Irq != pThis->channels[0].irq)
937	return SSMR3SetCfgError(pSSM, RT_SRC_POS, N_("Config mismatch - u8Irq: saved=%#x config=%#x"),
938	u8Irq, pThis->channels[0].irq);
939
940	bool fSpeakerCfg;
941	rc = SSMR3GetBool(pSSM, &fSpeakerCfg); AssertRCReturn(rc, rc);
942	if (fSpeakerCfg != pThis->fSpeakerCfg)
943	return SSMR3SetCfgError(pSSM, RT_SRC_POS, N_("Config mismatch - fSpeakerCfg: saved=%RTbool config=%RTbool"),
944	fSpeakerCfg, pThis->fSpeakerCfg);
945	}
946
947	if (uPass != SSM_PASS_FINAL)
948	return VINF_SUCCESS;
949
950	/* The state. */
951	for (unsigned i = 0; i < RT_ELEMENTS(pThis->channels); i++)
952	{
953	PPITCHANNEL pChan = &pThis->channels[i];
954	SSMR3GetU32(pSSM, &pChan->count);
955	SSMR3GetU16(pSSM, &pChan->latched_count);
956	SSMR3GetU8(pSSM, &pChan->count_latched);
957	SSMR3GetU8(pSSM, &pChan->status_latched);
958	SSMR3GetU8(pSSM, &pChan->status);
959	SSMR3GetU8(pSSM, &pChan->read_state);
960	SSMR3GetU8(pSSM, &pChan->write_state);
961	SSMR3GetU8(pSSM, &pChan->write_latch);
962	SSMR3GetU8(pSSM, &pChan->rw_mode);
963	SSMR3GetU8(pSSM, &pChan->mode);
964	SSMR3GetU8(pSSM, &pChan->bcd);
965	SSMR3GetU8(pSSM, &pChan->gate);
966	SSMR3GetU64(pSSM, &pChan->count_load_time);
967	SSMR3GetU64(pSSM, &pChan->u64NextTS);
968	SSMR3GetU64(pSSM, &pChan->u64ReloadTS);
969	SSMR3GetS64(pSSM, &pChan->next_transition_time);
970	if (pChan->CTX_SUFF(pTimer))
971	{
972	TMR3TimerLoad(pChan->CTX_SUFF(pTimer), pSSM);
973	LogRel(("PIT: mode=%d count=%#x (%u) - %d.%02d Hz (ch=%d) (restore)\n",
974	pChan->mode, pChan->count, pChan->count, PIT_FREQ / pChan->count, (PIT_FREQ * 100 / pChan->count) % 100, i));
975	PDMCritSectEnter(&pThis->CritSect, VERR_IGNORED);
976	TMTimerSetFrequencyHint(pChan->CTX_SUFF(pTimer), PIT_FREQ / pChan->count);
977	PDMCritSectLeave(&pThis->CritSect);
978	}
979	pThis->channels[i].cRelLogEntries = 0;
980	}
981
982	SSMR3GetS32(pSSM, &pThis->speaker_data_on);
983	#ifdef FAKE_REFRESH_CLOCK
984	SSMR3GetS32(pSSM, &pThis->dummy_refresh_clock);
985	#else
986	int32_t u32Dummy;
987	SSMR3GetS32(pSSM, &u32Dummy);
988	#endif
989	if (uVersion > PIT_SAVED_STATE_VERSION_VBOX_31)
990	SSMR3GetBool(pSSM, &pThis->fDisabledByHpet);
991
992	return VINF_SUCCESS;
993	}
994
995
996	/* -=-=-=-=-=- Timer -=-=-=-=-=- */
997
998	/**
999	* @callback_method_impl{FNTMTIMERDEV}
1000	* @param pvUser Pointer to the PIT channel state.
1001	*/
1002	static DECLCALLBACK(void) pitTimer(PPDMDEVINS pDevIns, PTMTIMER pTimer, void *pvUser)
1003	{
1004	PPITCHANNEL pChan = (PPITCHANNEL)pvUser;
1005	STAM_PROFILE_ADV_START(&pChan->CTX_SUFF(pPit)->StatPITHandler, a);
1006
1007	Log(("pitTimer\n"));
1008	Assert(PDMCritSectIsOwner(&PDMINS_2_DATA(pDevIns, PPITSTATE)->CritSect));
1009	Assert(TMTimerIsLockOwner(pTimer));
1010
1011	pit_irq_timer_update(pChan, pChan->next_transition_time, TMTimerGet(pTimer), true);
1012
1013	STAM_PROFILE_ADV_STOP(&pChan->CTX_SUFF(pPit)->StatPITHandler, a);
1014	}
1015
1016
1017	/* -=-=-=-=-=- Debug Info -=-=-=-=-=- */
1018
1019	/**
1020	* @callback_method_impl{FNDBGFHANDLERDEV}
1021	*/
1022	static DECLCALLBACK(void) pitInfo(PPDMDEVINS pDevIns, PCDBGFINFOHLP pHlp, const char *pszArgs)
1023	{
1024	PPITSTATE pThis = PDMINS_2_DATA(pDevIns, PPITSTATE);
1025	unsigned i;
1026	for (i = 0; i < RT_ELEMENTS(pThis->channels); i++)
1027	{
1028	const PITCHANNEL *pChan = &pThis->channels[i];
1029
1030	pHlp->pfnPrintf(pHlp,
1031	"PIT (i8254) channel %d status: irq=%#x\n"
1032	" count=%08x" " latched_count=%04x count_latched=%02x\n"
1033	" status=%02x status_latched=%02x read_state=%02x\n"
1034	" write_state=%02x write_latch=%02x rw_mode=%02x\n"
1035	" mode=%02x bcd=%02x gate=%02x\n"
1036	" count_load_time=%016RX64 next_transition_time=%016RX64\n"
1037	" u64ReloadTS=%016RX64 u64NextTS=%016RX64\n"
1038	,
1039	i, pChan->irq,
1040	pChan->count, pChan->latched_count, pChan->count_latched,
1041	pChan->status, pChan->status_latched, pChan->read_state,
1042	pChan->write_state, pChan->write_latch, pChan->rw_mode,
1043	pChan->mode, pChan->bcd, pChan->gate,
1044	pChan->count_load_time, pChan->next_transition_time,
1045	pChan->u64ReloadTS, pChan->u64NextTS);
1046	}
1047	#ifdef FAKE_REFRESH_CLOCK
1048	pHlp->pfnPrintf(pHlp, "speaker_data_on=%#x dummy_refresh_clock=%#x\n",
1049	pThis->speaker_data_on, pThis->dummy_refresh_clock);
1050	#else
1051	pHlp->pfnPrintf(pHlp, "speaker_data_on=%#x\n", pThis->speaker_data_on);
1052	#endif
1053	if (pThis->fDisabledByHpet)
1054	pHlp->pfnPrintf(pHlp, "Disabled by HPET\n");
1055	}
1056
1057
1058	/* -=-=-=-=-=- IHpetLegacyNotify -=-=-=-=-=- */
1059
1060	/**
1061	* @interface_method_impl{PDMIHPETLEGACYNOTIFY,pfnModeChanged}
1062	*/
1063	static DECLCALLBACK(void) pitNotifyHpetLegacyNotify_ModeChanged(PPDMIHPETLEGACYNOTIFY pInterface, bool fActivated)
1064	{
1065	PPITSTATE pThis = RT_FROM_MEMBER(pInterface, PITSTATE, IHpetLegacyNotify);
1066	PDMCritSectEnter(&pThis->CritSect, VERR_IGNORED);
1067
1068	pThis->fDisabledByHpet = fActivated;
1069
1070	PDMCritSectLeave(&pThis->CritSect);
1071	}
1072
1073
1074	/* -=-=-=-=-=- PDMDEVINS::IBase -=-=-=-=-=- */
1075
1076	/**
1077	* @interface_method_impl{PDMIBASE,pfnQueryInterface}
1078	*/
1079	static DECLCALLBACK(void ) pitQueryInterface(PPDMIBASE pInterface, const char pszIID)
1080	{
1081	PPDMDEVINS pDevIns = RT_FROM_MEMBER(pInterface, PDMDEVINS, IBase);
1082	PPITSTATE pThis = PDMINS_2_DATA(pDevIns, PPITSTATE);
1083	PDMIBASE_RETURN_INTERFACE(pszIID, PDMIBASE, &pDevIns->IBase);
1084	PDMIBASE_RETURN_INTERFACE(pszIID, PDMIHPETLEGACYNOTIFY, &pThis->IHpetLegacyNotify);
1085	return NULL;
1086	}
1087
1088
1089	/* -=-=-=-=-=- PDMDEVREG -=-=-=-=-=- */
1090
1091	/**
1092	* @interface_method_impl{PDMDEVREG,pfnRelocate}
1093	*/
1094	static DECLCALLBACK(void) pitRelocate(PPDMDEVINS pDevIns, RTGCINTPTR offDelta)
1095	{
1096	PPITSTATE pThis = PDMINS_2_DATA(pDevIns, PPITSTATE);
1097	LogFlow(("pitRelocate: \n"));
1098
1099	for (unsigned i = 0; i < RT_ELEMENTS(pThis->channels); i++)
1100	{
1101	PPITCHANNEL pChan = &pThis->channels[i];
1102	if (pChan->pTimerR3)
1103	pChan->pTimerRC = TMTimerRCPtr(pChan->pTimerR3);
1104	pThis->channels[i].pPitRC = PDMINS_2_DATA_RCPTR(pDevIns);
1105	}
1106	}
1107
1108
1109	/**
1110	* @interface_method_impl{PDMDEVREG,pfnReset}
1111	*/
1112	static DECLCALLBACK(void) pitReset(PPDMDEVINS pDevIns)
1113	{
1114	PPITSTATE pThis = PDMINS_2_DATA(pDevIns, PPITSTATE);
1115	LogFlow(("pitReset: \n"));
1116
1117	DEVPIT_R3_LOCK_BOTH(pThis);
1118
1119	pThis->fDisabledByHpet = false;
1120
1121	for (unsigned i = 0; i < RT_ELEMENTS(pThis->channels); i++)
1122	{
1123	PPITCHANNEL pChan = &pThis->channels[i];
1124
1125	#if 1 /* Set everything back to virgin state. (might not be strictly correct) */
1126	pChan->latched_count = 0;
1127	pChan->count_latched = 0;
1128	pChan->status_latched = 0;
1129	pChan->status = 0;
1130	pChan->read_state = 0;
1131	pChan->write_state = 0;
1132	pChan->write_latch = 0;
1133	pChan->rw_mode = 0;
1134	pChan->bcd = 0;
1135	#endif
1136	pChan->u64NextTS = UINT64_MAX;
1137	pChan->cRelLogEntries = 0;
1138	pChan->mode = 3;
1139	pChan->gate = (i != 2);
1140	pit_load_count(pChan, 0);
1141	}
1142
1143	DEVPIT_UNLOCK_BOTH(pThis);
1144	}
1145
1146
1147	/**
1148	* @interface_method_impl{PDMDEVREG,pfnConstruct}
1149	*/
1150	static DECLCALLBACK(int) pitConstruct(PPDMDEVINS pDevIns, int iInstance, PCFGMNODE pCfg)
1151	{
1152	PPITSTATE pThis = PDMINS_2_DATA(pDevIns, PPITSTATE);
1153	int rc;
1154	uint8_t u8Irq;
1155	uint16_t u16Base;
1156	bool fSpeaker;
1157	bool fGCEnabled;
1158	bool fR0Enabled;
1159	unsigned i;
1160	Assert(iInstance == 0);
1161
1162	/*
1163	* Validate configuration.
1164	*/
1165	if (!CFGMR3AreValuesValid(pCfg, "Irq\0" "Base\0" "SpeakerEnabled\0" "GCEnabled\0" "R0Enabled\0"))
1166	return VERR_PDM_DEVINS_UNKNOWN_CFG_VALUES;
1167
1168	/*
1169	* Init the data.
1170	*/
1171	rc = CFGMR3QueryU8Def(pCfg, "Irq", &u8Irq, 0);
1172	if (RT_FAILURE(rc))
1173	return PDMDEV_SET_ERROR(pDevIns, rc,
1174	N_("Configuration error: Querying \"Irq\" as a uint8_t failed"));
1175
1176	rc = CFGMR3QueryU16Def(pCfg, "Base", &u16Base, 0x40);
1177	if (RT_FAILURE(rc))
1178	return PDMDEV_SET_ERROR(pDevIns, rc,
1179	N_("Configuration error: Querying \"Base\" as a uint16_t failed"));
1180
1181	rc = CFGMR3QueryBoolDef(pCfg, "SpeakerEnabled", &fSpeaker, true);
1182	if (RT_FAILURE(rc))
1183	return PDMDEV_SET_ERROR(pDevIns, rc,
1184	N_("Configuration error: Querying \"SpeakerEnabled\" as a bool failed"));
1185
1186	rc = CFGMR3QueryBoolDef(pCfg, "GCEnabled", &fGCEnabled, true);
1187	if (RT_FAILURE(rc))
1188	return PDMDEV_SET_ERROR(pDevIns, rc,
1189	N_("Configuration error: Querying \"GCEnabled\" as a bool failed"));
1190
1191	rc = CFGMR3QueryBoolDef(pCfg, "R0Enabled", &fR0Enabled, true);
1192	if (RT_FAILURE(rc))
1193	return PDMDEV_SET_ERROR(pDevIns, rc,
1194	N_("Configuration error: failed to read R0Enabled as boolean"));
1195
1196	pThis->pDevIns = pDevIns;
1197	pThis->IOPortBaseCfg = u16Base;
1198	pThis->fSpeakerCfg = fSpeaker;
1199	pThis->channels[0].irq = u8Irq;
1200	for (i = 0; i < RT_ELEMENTS(pThis->channels); i++)
1201	{
1202	pThis->channels[i].pPitR3 = pThis;
1203	pThis->channels[i].pPitR0 = PDMINS_2_DATA_R0PTR(pDevIns);
1204	pThis->channels[i].pPitRC = PDMINS_2_DATA_RCPTR(pDevIns);
1205	}
1206
1207	/*
1208	* Interfaces
1209	*/
1210	/* IBase */
1211	pDevIns->IBase.pfnQueryInterface = pitQueryInterface;
1212	/* IHpetLegacyNotify */
1213	pThis->IHpetLegacyNotify.pfnModeChanged = pitNotifyHpetLegacyNotify_ModeChanged;
1214
1215	/*
1216	* We do our own locking. This must be done before creating timers.
1217	*/
1218	rc = PDMDevHlpCritSectInit(pDevIns, &pThis->CritSect, RT_SRC_POS, "pit#%u", iInstance);
1219	AssertRCReturn(rc, rc);
1220
1221	rc = PDMDevHlpSetDeviceCritSect(pDevIns, PDMDevHlpCritSectGetNop(pDevIns));
1222	AssertRCReturn(rc, rc);
1223
1224	/*
1225	* Create the timer, make it take our critsect.
1226	*/
1227	rc = PDMDevHlpTMTimerCreate(pDevIns, TMCLOCK_VIRTUAL_SYNC, pitTimer, &pThis->channels[0],
1228	TMTIMER_FLAGS_NO_CRIT_SECT, "i8254 Programmable Interval Timer",
1229	&pThis->channels[0].pTimerR3);
1230	if (RT_FAILURE(rc))
1231	return rc;
1232	pThis->channels[0].pTimerRC = TMTimerRCPtr(pThis->channels[0].pTimerR3);
1233	pThis->channels[0].pTimerR0 = TMTimerR0Ptr(pThis->channels[0].pTimerR3);
1234	rc = TMR3TimerSetCritSect(pThis->channels[0].pTimerR3, &pThis->CritSect);
1235	AssertRCReturn(rc, rc);
1236
1237	/*
1238	* Register I/O ports.
1239	*/
1240	rc = PDMDevHlpIOPortRegister(pDevIns, u16Base, 4, NULL, pitIOPortWrite, pitIOPortRead, NULL, NULL, "i8254 Programmable Interval Timer");
1241	if (RT_FAILURE(rc))
1242	return rc;
1243	if (fGCEnabled)
1244	{
1245	rc = PDMDevHlpIOPortRegisterRC(pDevIns, u16Base, 4, 0, "pitIOPortWrite", "pitIOPortRead", NULL, NULL, "i8254 Programmable Interval Timer");
1246	if (RT_FAILURE(rc))
1247	return rc;
1248	}
1249	if (fR0Enabled)
1250	{
1251	rc = PDMDevHlpIOPortRegisterR0(pDevIns, u16Base, 4, 0, "pitIOPortWrite", "pitIOPortRead", NULL, NULL, "i8254 Programmable Interval Timer");
1252	if (RT_FAILURE(rc))
1253	return rc;
1254	}
1255
1256	if (fSpeaker)
1257	{
1258	rc = PDMDevHlpIOPortRegister(pDevIns, 0x61, 1, NULL, pitIOPortSpeakerWrite, pitIOPortSpeakerRead, NULL, NULL, "PC Speaker");
1259	if (RT_FAILURE(rc))
1260	return rc;
1261	if (fGCEnabled)
1262	{
1263	rc = PDMDevHlpIOPortRegisterRC(pDevIns, 0x61, 1, 0, NULL, "pitIOPortSpeakerRead", NULL, NULL, "PC Speaker");
1264	if (RT_FAILURE(rc))
1265	return rc;
1266	}
1267	}
1268
1269	/*
1270	* Saved state.
1271	*/
1272	rc = PDMDevHlpSSMRegister3(pDevIns, PIT_SAVED_STATE_VERSION, sizeof(*pThis), pitLiveExec, pitSaveExec, pitLoadExec);
1273	if (RT_FAILURE(rc))
1274	return rc;
1275
1276	/*
1277	* Initialize the device state.
1278	*/
1279	pitReset(pDevIns);
1280
1281	/*
1282	* Register statistics and debug info.
1283	*/
1284	PDMDevHlpSTAMRegister(pDevIns, &pThis->StatPITIrq, STAMTYPE_COUNTER, "/TM/PIT/Irq", STAMUNIT_OCCURENCES, "The number of times a timer interrupt was triggered.");
1285	PDMDevHlpSTAMRegister(pDevIns, &pThis->StatPITHandler, STAMTYPE_PROFILE, "/TM/PIT/Handler", STAMUNIT_TICKS_PER_CALL, "Profiling timer callback handler.");
1286
1287	PDMDevHlpDBGFInfoRegister(pDevIns, "pit", "Display PIT (i8254) status. (no arguments)", pitInfo);
1288
1289	return VINF_SUCCESS;
1290	}
1291
1292
1293	/**
1294	* The device registration structure.
1295	*/
1296	const PDMDEVREG g_DeviceI8254 =
1297	{
1298	/* u32Version */
1299	PDM_DEVREG_VERSION,
1300	/* szName */
1301	"i8254",
1302	/* szRCMod */
1303	"VBoxDDGC.gc",
1304	/* szR0Mod */
1305	"VBoxDDR0.r0",
1306	/* pszDescription */
1307	"Intel 8254 Programmable Interval Timer (PIT) And Dummy Speaker Device",
1308	/* fFlags */
1309	PDM_DEVREG_FLAGS_HOST_BITS_DEFAULT \| PDM_DEVREG_FLAGS_GUEST_BITS_32_64 \| PDM_DEVREG_FLAGS_PAE36 \| PDM_DEVREG_FLAGS_RC \| PDM_DEVREG_FLAGS_R0,
1310	/* fClass */
1311	PDM_DEVREG_CLASS_PIT,
1312	/* cMaxInstances */
1313	1,
1314	/* cbInstance */
1315	sizeof(PITSTATE),
1316	/* pfnConstruct */
1317	pitConstruct,
1318	/* pfnDestruct */
1319	NULL,
1320	/* pfnRelocate */
1321	pitRelocate,
1322	/* pfnMemSetup */
1323	NULL,
1324	/* pfnPowerOn */
1325	NULL,
1326	/* pfnReset */
1327	pitReset,
1328	/* pfnSuspend */
1329	NULL,
1330	/* pfnResume */
1331	NULL,
1332	/* pfnAttach */
1333	NULL,
1334	/* pfnDetach */
1335	NULL,
1336	/* pfnQueryInterface */
1337	NULL,
1338	/* pfnInitComplete */
1339	NULL,
1340	/* pfnPowerOff */
1341	NULL,
1342	/* pfnSoftReset */
1343	NULL,
1344	/* u32VersionEnd */
1345	PDM_DEVREG_VERSION
1346	};
1347
1348	#endif /* IN_RING3 */
1349	#endif /* !VBOX_DEVICE_STRUCT_TESTCASE */

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source: vbox/trunk/src/VBox/Devices/PC/DevPit-i8254.cpp@ 51898

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