system.c@ 70775

Last change on this file since 70775 was 69501, checked in by vboxsync, 7 years ago
PC/BIOS: Added LGPL disclaimer text where appropriate.
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1	/* $Id: system.c 69501 2017-10-28 16:12:47Z vboxsync $ */
2	/** @file
3	* PC BIOS - ???
4	*/
5
6	/*
7	* Copyright (C) 2006-2017 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	* ROM BIOS for use with Bochs/Plex86/QEMU emulation environment
21	*
22	* Copyright (C) 2002 MandrakeSoft S.A.
23	*
24	* MandrakeSoft S.A.
25	* 43, rue d'Aboukir
26	* 75002 Paris - France
27	* http://www.linux-mandrake.com/
28	* http://www.mandrakesoft.com/
29	*
30	* This library is free software; you can redistribute it and/or
31	* modify it under the terms of the GNU Lesser General Public
32	* License as published by the Free Software Foundation; either
33	* version 2 of the License, or (at your option) any later version.
34	*
35	* This library is distributed in the hope that it will be useful,
36	* but WITHOUT ANY WARRANTY; without even the implied warranty of
37	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
38	* Lesser General Public License for more details.
39	*
40	* You should have received a copy of the GNU Lesser General Public
41	* License along with this library; if not, write to the Free Software
42	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
43	*
44	*/
45
46	/*
47	* Oracle LGPL Disclaimer: For the avoidance of doubt, except that if any license choice
48	* other than GPL or LGPL is available it will apply instead, Oracle elects to use only
49	* the Lesser General Public License version 2.1 (LGPLv2) at this time for any software where
50	* a choice of LGPL license versions is made available with the language indicating
51	* that LGPLv2 or any later version may be used, or where a choice of which version
52	* of the LGPL is applied is otherwise unspecified.
53	*/
54
55
56	#include <stdint.h>
57	#include "biosint.h"
58	#include "inlines.h"
59
60	#if DEBUG_INT15
61	# define BX_DEBUG_INT15(...) BX_DEBUG(__VA_ARGS__)
62	#else
63	# define BX_DEBUG_INT15(...)
64	#endif
65
66
67	#define UNSUPPORTED_FUNCTION 0x86 /* Specific to INT 15h. */
68
69	#define BIOS_CONFIG_TABLE 0xe6f5 /** @todo configurable? put elsewhere? */
70
71	#define ACPI_DATA_SIZE 0x00010000L /** @todo configurable? put elsewhere? */
72
73	#define BX_CPU 3
74
75	extern int pmode_IDT;
76	extern int rmode_IDT;
77
78	uint16_t read_ss(void);
79	#pragma aux read_ss = "mov ax, ss" modify exact [ax] nomemory;
80
81	#if VBOX_BIOS_CPU >= 80386
82
83	/* The 386+ code uses CR0 to switch to/from protected mode.
84	* Quite straightforward.
85	*/
86
87	void pm_stack_save(uint16_t cx, uint16_t es, uint16_t si, uint16_t frame);
88	#pragma aux pm_stack_save = \
89	".386" \
90	"push ds" \
91	"push eax" \
92	"xor eax, eax" \
93	"mov ds, ax" \
94	"mov ds:[467h], sp" \
95	"mov ds:[469h], ss" \
96	parm [cx] [es] [si] [ax] modify nomemory;
97
98	/* Uses position independent code... because it was too hard to figure
99	* out how to code the far call in inline assembler.
100	*/
101	void pm_enter(void);
102	#pragma aux pm_enter = \
103	".386p" \
104	"call pentry" \
105	"pentry:" \
106	"pop di" \
107	"add di, 1Bh" \
108	"push 20h" \
109	"push di" \
110	"lgdt fword ptr es:[si+8]" \
111	"lidt fword ptr cs:pmode_IDT" \
112	"mov eax, cr0" \
113	"or al, 1" \
114	"mov cr0, eax" \
115	"retf" \
116	"pm_pm:" \
117	"mov ax, 28h" \
118	"mov ss, ax" \
119	"mov ax, 10h" \
120	"mov ds, ax" \
121	"mov ax, 18h" \
122	"mov es, ax" \
123	modify nomemory;
124
125	/* Restore segment limits to real mode compatible values and
126	* return to real mode.
127	*/
128	void pm_exit(void);
129	#pragma aux pm_exit = \
130	".386p" \
131	"call pexit" \
132	"pexit:" \
133	"pop ax" \
134	"push 0F000h" \
135	"add ax, 18h" \
136	"push ax" \
137	"mov ax, 28h" \
138	"mov ds, ax" \
139	"mov es, ax" \
140	"mov eax, cr0" \
141	"and al, 0FEh" \
142	"mov cr0, eax" \
143	"retf" \
144	"real_mode:" \
145	"lidt fword ptr cs:rmode_IDT" \
146	modify nomemory;
147
148	/* Restore stack and reload segment registers in real mode to ensure
149	* real mode compatible selector+base.
150	*/
151	void pm_stack_restore(void);
152	#pragma aux pm_stack_restore = \
153	".386" \
154	"xor ax, ax" \
155	"mov ds, ax" \
156	"mov es, ax" \
157	"lss sp, ds:[467h]" \
158	"pop eax" \
159	"pop ds" \
160	modify nomemory;
161
162	#elif VBOX_BIOS_CPU >= 80286
163
164	/* The 286 code uses LMSW to switch to protected mode but it has to reset
165	* the CPU to get back to real mode. Ugly! See return_blkmove in orgs.asm
166	* for the other matching half.
167	*/
168	void pm_stack_save(uint16_t cx, uint16_t es, uint16_t si, uint16_t frame);
169	#pragma aux pm_stack_save = \
170	"xor ax, ax" \
171	"mov ds, ax" \
172	"mov ds:[467h], bx" \
173	"mov ds:[469h], ss" \
174	parm [cx] [es] [si] [bx] modify nomemory;
175
176	/* Uses position independent code... because it was too hard to figure
177	* out how to code the far call in inline assembler.
178	* NB: Trashes MSW bits but the CPU will be reset anyway.
179	*/
180	void pm_enter(void);
181	#pragma aux pm_enter = \
182	".286p" \
183	"call pentry" \
184	"pentry:" \
185	"pop di" \
186	"add di, 18h" \
187	"push 20h" \
188	"push di" \
189	"lgdt fword ptr es:[si+8]" \
190	"lidt fword ptr cs:pmode_IDT" \
191	"or al, 1" \
192	"lmsw ax" \
193	"retf" \
194	"pm_pm:" \
195	"mov ax, 28h" \
196	"mov ss, ax" \
197	"mov ax, 10h" \
198	"mov ds, ax" \
199	"mov ax, 18h" \
200	"mov es, ax" \
201	modify nomemory;
202
203	/* Set up shutdown status and reset the CPU. The POST code
204	* will regain control. Port 80h is written with status.
205	* Code 9 is written to CMOS shutdown status byte (0Fh).
206	* CPU is triple faulted. .
207	*/
208	void pm_exit(void);
209	#pragma aux pm_exit = \
210	"xor ax, ax" \
211	"out 80h, al" \
212	"mov al, 0Fh" \
213	"out 70h, al" \
214	"mov al, 09h" \
215	"out 71h, al" \
216	".286p" \
217	"lidt fword ptr cs:pmode_IDT" \
218	"int 3" \
219	modify nomemory;
220
221	/* Dummy. Actually done in return_blkmove. */
222	void pm_stack_restore(void);
223	#pragma aux pm_stack_restore = \
224	"rm_return:" \
225	modify nomemory;
226
227	#endif
228
229	void pm_copy(void);
230	#pragma aux pm_copy = \
231	"xor si, si" \
232	"xor di, di" \
233	"cld" \
234	"rep movsw" \
235	modify nomemory;
236
237	/* The pm_switch has a few crucial differences from pm_enter, hence
238	* it is replicated here. Uses LMSW to avoid trashing high word of eax.
239	*/
240	void pm_switch(uint16_t reg_si);
241	#pragma aux pm_switch = \
242	".286p" \
243	"call pentry" \
244	"pentry:" \
245	"pop di" \
246	"add di, 18h" \
247	"push 38h" \
248	"push di" \
249	"lgdt fword ptr es:[si+08h]" \
250	"lidt fword ptr es:[si+10h]" \
251	"mov ax, 1" \
252	"lmsw ax" \
253	"retf" \
254	"pm_pm:" \
255	"mov ax, 28h" \
256	"mov ss, ax" \
257	"mov ax, 18h" \
258	"mov ds, ax" \
259	"mov ax, 20h" \
260	"mov es, ax" \
261	parm [si] modify nomemory;
262
263	/* Return to caller - we do not use IRET because we should not enable
264	* interrupts. Note that AH must be zero on exit.
265	* WARNING: Needs to be adapted if calling sequence is modified!
266	*/
267	void pm_unwind(uint16_t args);
268	#pragma aux pm_unwind = \
269	".286" \
270	"mov sp, ax" \
271	"popa" \
272	"add sp, 6" \
273	"pop cx" \
274	"pop ax" \
275	"pop ax" \
276	"mov ax, 30h" \
277	"push ax" \
278	"push cx" \
279	"retf" \
280	parm [ax] modify nomemory aborts;
281
282	/// @todo This method is silly. The RTC should be programmed to fire an interrupt
283	// instead of hogging the CPU with inaccurate code.
284	void timer_wait(uint32_t usec_wait)
285	{
286	uint32_t cycles;
287	uint8_t old_val;
288	uint8_t cur_val;
289
290	/* We wait in 15 usec increments. */
291	cycles = usec_wait / 15;
292
293	old_val = inp(0x61) & 0x10;
294	while (cycles--) {
295	/* Wait 15us. */
296	do {
297	cur_val = inp(0x61) & 0x10;
298	} while (cur_val != old_val);
299	old_val = cur_val;
300	}
301	}
302
303	bx_bool set_enable_a20(bx_bool val)
304	{
305	uint8_t oldval;
306
307	// Use PS/2 System Control port A to set A20 enable
308
309	// get current setting first
310	oldval = inb(0x92);
311
312	// change A20 status
313	if (val)
314	outb(0x92, oldval \| 0x02);
315	else
316	outb(0x92, oldval & 0xfd);
317
318	return((oldval & 0x02) != 0);
319	}
320
321	typedef struct {
322	uint32_t start;
323	uint32_t xstart;
324	uint32_t len;
325	uint32_t xlen;
326	uint32_t type;
327	} mem_range_t;
328
329	void set_e820_range(uint16_t ES, uint16_t DI, uint32_t start, uint32_t end,
330	uint8_t extra_start, uint8_t extra_end, uint16_t type)
331	{
332	mem_range_t __far *range;
333
334	range = ES :> (mem_range_t *)DI;
335	range->start = start;
336	range->xstart = extra_start;
337	end -= start;
338	extra_end -= extra_start;
339	range->len = end;
340	range->xlen = extra_end;
341	range->type = type;
342	}
343
344	/// @todo move elsewhere?
345	#define AX r.gr.u.r16.ax
346	#define BX r.gr.u.r16.bx
347	#define CX r.gr.u.r16.cx
348	#define DX r.gr.u.r16.dx
349	#define SI r.gr.u.r16.si
350	#define DI r.gr.u.r16.di
351	#define BP r.gr.u.r16.bp
352	#define SP r.gr.u.r16.sp
353	#define FLAGS r.fl.u.r16.flags
354	#define EAX r.gr.u.r32.eax
355	#define EBX r.gr.u.r32.ebx
356	#define ECX r.gr.u.r32.ecx
357	#define EDX r.gr.u.r32.edx
358	#define ESI r.gr.u.r32.esi
359	#define EDI r.gr.u.r32.edi
360	#define ES r.es
361
362
363	void BIOSCALL int15_function(sys_regs_t r)
364	{
365	uint16_t bRegister;
366	uint8_t irqDisable;
367
368	BX_DEBUG_INT15("int15 AX=%04x\n",AX);
369
370	switch (GET_AH()) {
371	case 0x00: /* assorted functions */
372	if (GET_AL() != 0xc0)
373	goto undecoded;
374	/* GRUB calls int15 with ax=0x00c0 to get the ROM configuration table,
375	* which we don't support, but logging that event is annoying. In fact
376	* it is likely that they just misread some specs, because there is a
377	* int15 BIOS function AH=0xc0 which sounds quite similar to what GRUB
378	* wants to achieve. */
379	SET_CF();
380	SET_AH(UNSUPPORTED_FUNCTION);
381	break;
382	case 0x24: /* A20 Control */
383	switch (GET_AL()) {
384	case 0x00:
385	set_enable_a20(0);
386	CLEAR_CF();
387	SET_AH(0);
388	break;
389	case 0x01:
390	set_enable_a20(1);
391	CLEAR_CF();
392	SET_AH(0);
393	break;
394	case 0x02:
395	SET_AL( (inb(0x92) >> 1) & 0x01 );
396	CLEAR_CF();
397	SET_AH(0);
398	break;
399	case 0x03:
400	CLEAR_CF();
401	SET_AH(0);
402	BX = 3;
403	break;
404	default:
405	BX_INFO("int15: Func 24h, subfunc %02xh, A20 gate control not supported\n", (unsigned) GET_AL());
406	SET_CF();
407	SET_AH(UNSUPPORTED_FUNCTION);
408	}
409	break;
410
411	case 0x41:
412	SET_CF();
413	SET_AH(UNSUPPORTED_FUNCTION);
414	break;
415
416	/// @todo Why does this need special handling? All we need is to set CF
417	// but not handle this as an unknown function (regardless of CPU type).
418	case 0x4f:
419	/* keyboard intercept */
420	#if BX_CPU < 2
421	SET_AH(UNSUPPORTED_FUNCTION);
422	#else
423	// nop
424	#endif
425	SET_CF();
426	break;
427
428	case 0x52: // removable media eject
429	CLEAR_CF();
430	SET_AH(0); // "ok ejection may proceed"
431	break;
432
433	case 0x83: {
434	if( GET_AL() == 0 ) {
435	// Set Interval requested.
436	if( ( read_byte( 0x40, 0xA0 ) & 1 ) == 0 ) {
437	// Interval not already set.
438	write_byte( 0x40, 0xA0, 1 ); // Set status byte.
439	write_word( 0x40, 0x98, ES ); // Byte location, segment
440	write_word( 0x40, 0x9A, BX ); // Byte location, offset
441	write_word( 0x40, 0x9C, DX ); // Low word, delay
442	write_word( 0x40, 0x9E, CX ); // High word, delay.
443	CLEAR_CF( );
444	irqDisable = inb( 0xA1 );
445	outb( 0xA1, irqDisable & 0xFE );
446	bRegister = inb_cmos( 0xB ); // Unmask IRQ8 so INT70 will get through.
447	outb_cmos( 0xB, bRegister \| 0x40 ); // Turn on the Periodic Interrupt timer
448	} else {
449	// Interval already set.
450	BX_DEBUG_INT15("int15: Func 83h, failed, already waiting.\n" );
451	SET_CF();
452	SET_AH(UNSUPPORTED_FUNCTION);
453	}
454	} else if( GET_AL() == 1 ) {
455	// Clear Interval requested
456	write_byte( 0x40, 0xA0, 0 ); // Clear status byte
457	CLEAR_CF( );
458	bRegister = inb_cmos( 0xB );
459	outb_cmos( 0xB, bRegister & ~0x40 ); // Turn off the Periodic Interrupt timer
460	} else {
461	BX_DEBUG_INT15("int15: Func 83h, failed.\n" );
462	SET_CF();
463	SET_AH(UNSUPPORTED_FUNCTION);
464	SET_AL(GET_AL() - 1);
465	}
466
467	break;
468	}
469
470	case 0x88:
471	// Get the amount of extended memory (above 1M)
472	#if BX_CPU < 2
473	SET_AH(UNSUPPORTED_FUNCTION);
474	SET_CF();
475	#else
476	AX = (inb_cmos(0x31) << 8) \| inb_cmos(0x30);
477
478	// According to Ralf Brown's interrupt the limit should be 15M,
479	// but real machines mostly return max. 63M.
480	if(AX > 0xffc0)
481	AX = 0xffc0;
482
483	CLEAR_CF();
484	#endif
485	break;
486
487	case 0x89:
488	// Switch to Protected Mode.
489	// ES:DI points to user-supplied GDT
490	// BH/BL contains starting interrupt numbers for PIC0/PIC1
491	// This subfunction does not return!
492
493	// turn off interrupts
494	int_disable(); /// @todo aren't they off already?
495
496	set_enable_a20(1); // enable A20 line; we're supposed to fail if that fails
497
498	// Initialize CS descriptor for BIOS
499	write_word(ES, SI+0x38+0, 0xffff);// limit 15:00 = normal 64K limit
500	write_word(ES, SI+0x38+2, 0x0000);// base 15:00
501	write_byte(ES, SI+0x38+4, 0x000f);// base 23:16 (hardcoded to f000:0000)
502	write_byte(ES, SI+0x38+5, 0x9b); // access
503	write_word(ES, SI+0x38+6, 0x0000);// base 31:24/reserved/limit 19:16
504
505	/* Reprogram the PICs. */
506	outb(PIC_MASTER, PIC_CMD_INIT);
507	outb(PIC_SLAVE, PIC_CMD_INIT);
508	outb(PIC_MASTER + 1, GET_BH());
509	outb(PIC_SLAVE + 1, GET_BL());
510	outb(PIC_MASTER + 1, 4);
511	outb(PIC_SLAVE + 1, 2);
512	outb(PIC_MASTER + 1, 1);
513	outb(PIC_SLAVE + 1, 1);
514	/* Mask all IRQs, user must re-enable. */
515	outb(PIC_MASTER_MASK, 0xff);
516	outb(PIC_SLAVE_MASK, 0xff);
517
518	pm_switch(SI);
519	pm_unwind((uint16_t)&r);
520
521	break;
522
523	case 0x90:
524	/* Device busy interrupt. Called by Int 16h when no key available */
525	break;
526
527	case 0x91:
528	/* Interrupt complete. Called by Int 16h when key becomes available */
529	break;
530
531	case 0xbf:
532	BX_INFO("*** int 15h function AH=bf not yet supported!\n");
533	SET_CF();
534	SET_AH(UNSUPPORTED_FUNCTION);
535	break;
536
537	case 0xC0:
538	CLEAR_CF();
539	SET_AH(0);
540	BX = BIOS_CONFIG_TABLE;
541	ES = 0xF000;
542	break;
543
544	case 0xc1:
545	ES = read_word(0x0040, 0x000E);
546	CLEAR_CF();
547	break;
548
549	case 0xd8:
550	bios_printf(BIOS_PRINTF_DEBUG, "EISA BIOS not present\n");
551	SET_CF();
552	SET_AH(UNSUPPORTED_FUNCTION);
553	break;
554
555	/* Make the BIOS warning for pretty much every Linux kernel start
556	* disappear - it calls with ax=0xe980 to figure out SMI info. */
557	case 0xe9: /* SMI functions (SpeedStep and similar things) */
558	SET_CF();
559	SET_AH(UNSUPPORTED_FUNCTION);
560	break;
561	case 0xec: /* AMD64 target operating mode callback */
562	if (GET_AL() != 0)
563	goto undecoded;
564	SET_AH(0);
565	if (GET_BL() >= 1 && GET_BL() <= 3)
566	CLEAR_CF(); /* Accepted value. */
567	else
568	SET_CF(); /* Reserved, error. */
569	break;
570	undecoded:
571	default:
572	BX_INFO("*** int 15h function AX=%04x, BX=%04x not yet supported!\n",
573	(unsigned) AX, (unsigned) BX);
574	SET_CF();
575	SET_AH(UNSUPPORTED_FUNCTION);
576	break;
577	}
578	}
579
580	void BIOSCALL int15_function32(sys32_regs_t r)
581	{
582	uint32_t extended_memory_size=0; // 64bits long
583	uint32_t extra_lowbits_memory_size=0;
584	uint8_t extra_highbits_memory_size=0;
585	uint32_t mcfgStart, mcfgSize;
586
587	BX_DEBUG_INT15("int15 AX=%04x\n",AX);
588
589	switch (GET_AH()) {
590	case 0x86:
591	// Wait for CX:DX microseconds. currently using the
592	// refresh request port 0x61 bit4, toggling every 15usec
593	int_enable();
594	timer_wait(((uint32_t)CX << 16) \| DX);
595	break;
596
597	case 0xd0:
598	if (GET_AL() != 0x4f)
599	goto int15_unimplemented;
600	if (EBX == 0x50524f43 && ECX == 0x4d4f4445 && ESI == 0 && EDI == 0)
601	{
602	CLEAR_CF();
603	ESI = EBX;
604	EDI = ECX;
605	EAX = 0x49413332;
606	}
607	else
608	goto int15_unimplemented;
609	break;
610
611	case 0xe8:
612	switch(GET_AL()) {
613	case 0x20: // coded by osmaker aka K.J.
614	if(EDX == 0x534D4150) {
615	extended_memory_size = inb_cmos(0x35);
616	extended_memory_size <<= 8;
617	extended_memory_size \|= inb_cmos(0x34);
618	extended_memory_size *= 64;
619	#ifndef VBOX /* The following excludes 0xf0000000 thru 0xffffffff. Trust DevPcBios.cpp to get this right. */
620	// greater than EFF00000???
621	if(extended_memory_size > 0x3bc000) {
622	extended_memory_size = 0x3bc000; // everything after this is reserved memory until we get to 0x100000000
623	}
624	#endif /* !VBOX */
625	extended_memory_size *= 1024;
626	extended_memory_size += (16L * 1024 * 1024);
627
628	if(extended_memory_size <= (16L * 1024 * 1024)) {
629	extended_memory_size = inb_cmos(0x31);
630	extended_memory_size <<= 8;
631	extended_memory_size \|= inb_cmos(0x30);
632	extended_memory_size *= 1024;
633	extended_memory_size += (1L * 1024 * 1024);
634	}
635
636	#ifdef VBOX /* We've already used the CMOS entries for SATA.
637	BTW. This is the amount of memory above 4GB measured in 64KB units. */
638	extra_lowbits_memory_size = inb_cmos(0x62);
639	extra_lowbits_memory_size <<= 8;
640	extra_lowbits_memory_size \|= inb_cmos(0x61);
641	extra_lowbits_memory_size <<= 16;
642	extra_highbits_memory_size = inb_cmos(0x63);
643	/* 0x64 and 0x65 can be used if we need to dig 1 TB or more at a later point. */
644	#else
645	extra_lowbits_memory_size = inb_cmos(0x5c);
646	extra_lowbits_memory_size <<= 8;
647	extra_lowbits_memory_size \|= inb_cmos(0x5b);
648	extra_lowbits_memory_size *= 64;
649	extra_lowbits_memory_size *= 1024;
650	extra_highbits_memory_size = inb_cmos(0x5d);
651	#endif /* !VBOX */
652
653	mcfgStart = 0;
654	mcfgSize = 0;
655
656	switch(BX)
657	{
658	case 0:
659	set_e820_range(ES, DI,
660	#ifndef VBOX /** @todo Upstream suggests the following, needs checking. (see next as well) */
661	0x0000000L, 0x0009f000L, 0, 0, 1);
662	#else
663	0x0000000L, 0x0009fc00L, 0, 0, 1);
664	#endif
665	EBX = 1;
666	break;
667	case 1:
668	set_e820_range(ES, DI,
669	#ifndef VBOX /** @todo Upstream suggests the following, needs checking. (see next as well) */
670	0x0009f000L, 0x000a0000L, 0, 0, 2);
671	#else
672	0x0009fc00L, 0x000a0000L, 0, 0, 2);
673	#endif
674	EBX = 2;
675	break;
676	case 2:
677	#ifdef VBOX
678	/* Mark the BIOS as reserved. VBox doesn't currently
679	* use the 0xe0000-0xeffff area. It does use the
680	* 0xd0000-0xdffff area for the BIOS logo, but it's
681	* not worth marking it as reserved. (this is not
682	* true anymore because the VGA adapter handles the logo stuff)
683	* The whole 0xe0000-0xfffff can be used for the BIOS.
684	* Note that various
685	* Windows versions don't accept (read: in debug builds
686	* they trigger the "Too many similar traps" assertion)
687	* a single reserved range from 0xd0000 to 0xffffff.
688	* A 128K area starting from 0xd0000 works. */
689	set_e820_range(ES, DI,
690	0x000f0000L, 0x00100000L, 0, 0, 2);
691	#else /* !VBOX */
692	set_e820_range(ES, DI,
693	0x000e8000L, 0x00100000L, 0, 0, 2);
694	#endif /* !VBOX */
695	EBX = 3;
696	break;
697	case 3:
698	#if BX_ROMBIOS32 \|\| defined(VBOX)
699	set_e820_range(ES, DI,
700	0x00100000L,
701	extended_memory_size - ACPI_DATA_SIZE, 0, 0, 1);
702	EBX = 4;
703	#else
704	set_e820_range(ES, DI,
705	0x00100000L,
706	extended_memory_size, 1);
707	EBX = 5;
708	#endif
709	break;
710	case 4:
711	set_e820_range(ES, DI,
712	extended_memory_size - ACPI_DATA_SIZE,
713	extended_memory_size, 0, 0, 3); // ACPI RAM
714	EBX = 5;
715	break;
716	case 5:
717	set_e820_range(ES, DI,
718	0xfec00000,
719	0xfec00000 + 0x1000, 0, 0, 2); // I/O APIC
720	EBX = 6;
721	break;
722	case 6:
723	set_e820_range(ES, DI,
724	0xfee00000,
725	0xfee00000 + 0x1000, 0, 0, 2); // Local APIC
726	EBX = 7;
727	break;
728	case 7:
729	/* 256KB BIOS area at the end of 4 GB */
730	#ifdef VBOX
731	/* We don't set the end to 1GB here and rely on the 32-bit
732	unsigned wrap around effect (0-0xfffc0000L). */
733	#endif
734	set_e820_range(ES, DI,
735	0xfffc0000L, 0x00000000L, 0, 0, 2);
736	if (mcfgStart != 0)
737	EBX = 8;
738	else
739	{
740	if (extra_highbits_memory_size \|\| extra_lowbits_memory_size)
741	EBX = 9;
742	else
743	EBX = 0;
744	}
745	break;
746	case 8:
747	/* PCI MMIO config space (MCFG) */
748	set_e820_range(ES, DI,
749	mcfgStart, mcfgStart + mcfgSize, 0, 0, 2);
750
751	if (extra_highbits_memory_size \|\| extra_lowbits_memory_size)
752	EBX = 9;
753	else
754	EBX = 0;
755	break;
756	case 9:
757	#ifdef VBOX /* Don't succeeded if no memory above 4 GB. */
758	/* Mapping of memory above 4 GB if present.
759	Note1: set_e820_range needs do no borrowing in the
760	subtraction because of the nice numbers.
761	Note2* works only up to 1TB because of uint8_t for
762	the upper bits!*/
763	if (extra_highbits_memory_size \|\| extra_lowbits_memory_size)
764	{
765	set_e820_range(ES, DI,
766	0x00000000L, extra_lowbits_memory_size,
767	1 /x4GB/, extra_highbits_memory_size + 1 /x4GB/, 1);
768	EBX = 0;
769	}
770	break;
771	/* fall thru */
772	#else /* !VBOX */
773	/* Mapping of memory above 4 GB */
774	set_e820_range(ES, DI, 0x00000000L,
775	extra_lowbits_memory_size, 1, extra_highbits_memory_size
776	+ 1, 1);
777	EBX = 0;
778	break;
779	#endif /* !VBOX */
780	default: /* AX=E820, DX=534D4150, BX unrecognized */
781	goto int15_unimplemented;
782	break;
783	}
784	EAX = 0x534D4150;
785	ECX = 0x14;
786	CLEAR_CF();
787	} else {
788	// if DX != 0x534D4150)
789	goto int15_unimplemented;
790	}
791	break;
792
793	case 0x01:
794	// do we have any reason to fail here ?
795	CLEAR_CF();
796
797	// my real system sets ax and bx to 0
798	// this is confirmed by Ralph Brown list
799	// but syslinux v1.48 is known to behave
800	// strangely if ax is set to 0
801	// regs.u.r16.ax = 0;
802	// regs.u.r16.bx = 0;
803
804	// Get the amount of extended memory (above 1M)
805	CX = (inb_cmos(0x31) << 8) \| inb_cmos(0x30);
806
807	// limit to 15M
808	if(CX > 0x3c00)
809	CX = 0x3c00;
810
811	// Get the amount of extended memory above 16M in 64k blocks
812	DX = (inb_cmos(0x35) << 8) \| inb_cmos(0x34);
813
814	// Set configured memory equal to extended memory
815	AX = CX;
816	BX = DX;
817	break;
818	default: /* AH=0xE8?? but not implemented */
819	goto int15_unimplemented;
820	}
821	break;
822	int15_unimplemented:
823	// fall into the default case
824	default:
825	BX_INFO("*** int 15h function AX=%04x, BX=%04x not yet supported!\n",
826	(unsigned) AX, (unsigned) BX);
827	SET_CF();
828	SET_AL(UNSUPPORTED_FUNCTION);
829	break;
830	}
831	}
832
833	#if VBOX_BIOS_CPU >= 80286
834
835	#undef FLAGS
836	#define FLAGS r.ra.flags.u.r16.flags
837
838	/* Function 0x87 handled separately due to specific stack layout requirements. */
839	void BIOSCALL int15_blkmove(disk_regs_t r)
840	{
841	bx_bool prev_a20_enable;
842	uint16_t base15_00;
843	uint8_t base23_16;
844	uint16_t ss;
845
846	// +++ should probably have descriptor checks
847	// +++ should have exception handlers
848
849	// turn off interrupts
850	int_disable(); /// @todo aren't they disabled already?
851
852	prev_a20_enable = set_enable_a20(1); // enable A20 line
853
854	// 128K max of transfer on 386+ ???
855	// source == destination ???
856
857	// ES:SI points to descriptor table
858	// offset use initially comments
859	// ==============================================
860	// 00..07 Unused zeros Null descriptor
861	// 08..0f GDT zeros filled in by BIOS
862	// 10..17 source ssssssss source of data
863	// 18..1f dest dddddddd destination of data
864	// 20..27 CS zeros filled in by BIOS
865	// 28..2f SS zeros filled in by BIOS
866
867	//es:si
868	//eeee0
869	//0ssss
870	//-----
871
872	// check for access rights of source & dest here
873
874	// Initialize GDT descriptor
875	base15_00 = (ES << 4) + SI;
876	base23_16 = ES >> 12;
877	if (base15_00 < (ES<<4))
878	base23_16++;
879	write_word(ES, SI+0x08+0, 47); // limit 15:00 = 6 * 8bytes/descriptor
880	write_word(ES, SI+0x08+2, base15_00);// base 15:00
881	write_byte(ES, SI+0x08+4, base23_16);// base 23:16
882	write_byte(ES, SI+0x08+5, 0x93); // access
883	write_word(ES, SI+0x08+6, 0x0000); // base 31:24/reserved/limit 19:16
884
885	// Initialize CS descriptor
886	write_word(ES, SI+0x20+0, 0xffff);// limit 15:00 = normal 64K limit
887	write_word(ES, SI+0x20+2, 0x0000);// base 15:00
888	write_byte(ES, SI+0x20+4, 0x000f);// base 23:16
889	write_byte(ES, SI+0x20+5, 0x9b); // access
890	write_word(ES, SI+0x20+6, 0x0000);// base 31:24/reserved/limit 19:16
891
892	// Initialize SS descriptor
893	ss = read_ss();
894	base15_00 = ss << 4;
895	base23_16 = ss >> 12;
896	write_word(ES, SI+0x28+0, 0xffff); // limit 15:00 = normal 64K limit
897	write_word(ES, SI+0x28+2, base15_00);// base 15:00
898	write_byte(ES, SI+0x28+4, base23_16);// base 23:16
899	write_byte(ES, SI+0x28+5, 0x93); // access
900	write_word(ES, SI+0x28+6, 0x0000); // base 31:24/reserved/limit 19:16
901
902	pm_stack_save(CX, ES, SI, FP_OFF(&r));
903	pm_enter();
904	pm_copy();
905	pm_exit();
906	pm_stack_restore();
907
908	set_enable_a20(prev_a20_enable);
909
910	// turn interrupts back on
911	int_enable();
912
913	SET_AH(0);
914	CLEAR_CF();
915	}
916	#endif

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source: vbox/trunk/src/VBox/Devices/PC/BIOS/system.c@ 70775

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