vbe.c@ 46495

最後變更在這個檔案從46495是 43152,由 vboxsync 提交於 12 年前
VGABIOS: Allow building with DEBUG_VGA again.
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1	// ============================================================================================
2	//
3	// Copyright (C) 2002 Jeroen Janssen
4	//
5	// This library is free software; you can redistribute it and/or
6	// modify it under the terms of the GNU Lesser General Public
7	// License as published by the Free Software Foundation; either
8	// version 2 of the License, or (at your option) any later version.
9	//
10	// This library is distributed in the hope that it will be useful,
11	// but WITHOUT ANY WARRANTY; without even the implied warranty of
12	// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13	// Lesser General Public License for more details.
14	//
15	// You should have received a copy of the GNU Lesser General Public
16	// License along with this library; if not, write to the Free Software
17	// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18	//
19	// ============================================================================================
20	//
21	// This VBE is part of the VGA Bios specific to the plex86/bochs Emulated VGA card.
22	// You can NOT drive any physical vga card with it.
23	//
24	// ============================================================================================
25	//
26	// This VBE Bios is based on information taken from :
27	// - VESA BIOS EXTENSION (VBE) Core Functions Standard Version 3.0 located at www.vesa.org
28	//
29	// ============================================================================================
30
31
32	/*
33	* Oracle LGPL Disclaimer: For the avoidance of doubt, except that if any license choice
34	* other than GPL or LGPL is available it will apply instead, Oracle elects to use only
35	* the Lesser General Public License version 2.1 (LGPLv2) at this time for any software where
36	* a choice of LGPL license versions is made available with the language indicating
37	* that LGPLv2 or any later version may be used, or where a choice of which version
38	* of the LGPL is applied is otherwise unspecified.
39	*/
40
41	// Use VBE new dynamic mode list. Note that without this option, no
42	// checks are currently done to make sure that modes fit into the
43	// framebuffer!
44	#define VBE_NEW_DYN_LIST
45
46	#include <inttypes.h>
47	#include <stddef.h>
48	#include "vbe.h"
49	#include "vgadefs.h"
50	#include "inlines.h"
51
52	// disable VESA/VBE2 check in vbe info
53	//#define VBE2_NO_VESA_CHECK
54
55	// use bytewise i/o (Longhorn beta issue, not in released Vista)
56	//#define VBE_BYTEWISE_IO
57
58	#ifdef VBE_BYTEWISE_IO
59	extern void do_out_dx_ax();
60	#pragma aux do_out_dx_ax "*";
61	extern void out_w(uint16_t port, uint16_t value);
62	#pragma aux out_w = \
63	"call do_out_dx_ax" \
64	parm [dx] [ax] modify nomemory;
65	extern void do_in_ax_dx();
66	#pragma aux do_in_ax_dx "*";
67	extern uint16_t in_w(uint16_t port);
68	#pragma aux in_w = \
69	"call do_in_ax_dx" \
70	parm [dx] value [ax] modify nomemory;
71	#else
72	#define out_w outw
73	#define in_w inw
74	#endif
75
76
77	/* VESA signatures as integer constants. */
78	#define SIG_VBE2 0x32454256 /* 'VBE2' */
79	#define SIG_VESA 0x41534556 /* 'VESA' */
80
81
82	/* Implemented in assembler. */
83	extern void __cdecl vga_compat_setup(void);
84	extern void dispi_set_enable(uint16_t enable);
85	extern void dispi_set_bank(uint16_t bank);
86	extern uint16_t __cdecl dispi_get_max_bpp(void);
87	extern void __cdecl dispi_set_bank_farcall(void);
88
89	// The current OEM Software Revision of this VBE Bios
90	#define VBE_OEM_SOFTWARE_REV 0x0003
91
92	// FIXME: 'merge' these (c) etc strings with the vgabios.c strings?
93	char vbebios_copyright[] = "VirtualBox VESA BIOS";
94	char vbebios_vendor_name[] = VBOX_VENDOR;
95	char vbebios_product_name[] = VBOX_PRODUCT " VBE Adapter";
96	char vbebios_product_revision[] = VBOX_PRODUCT " Version " VBOX_VERSION_STRING;
97
98	char vbebios_info_string[] = "VirtualBox VBE Display Adapter enabled\r\n\r\n";
99	char no_vbebios_info_string[] = "No VirtualBox VBE support available!\r\n\r\n";
100
101	#ifdef VGA_DEBUG
102	char msg_vbe_init[] = "VirtualBox Version " VBOX_VERSION_STRING " VBE Display Adapter\r\n";
103	#endif
104
105	static void dispi_set_xres(uint16_t xres)
106	{
107	#ifdef VGA_DEBUG
108	printf("vbe_set_xres: %04x\n", xres);
109	#endif
110	out_w(VBE_DISPI_IOPORT_INDEX, VBE_DISPI_INDEX_XRES);
111	out_w(VBE_DISPI_IOPORT_DATA, xres);
112	}
113
114	static void dispi_set_yres(uint16_t yres)
115	{
116	#ifdef VGA_DEBUG
117	printf("vbe_set_yres: %04x\n", yres);
118	#endif
119	out_w(VBE_DISPI_IOPORT_INDEX, VBE_DISPI_INDEX_YRES);
120	out_w(VBE_DISPI_IOPORT_DATA, yres);
121	}
122
123	static void dispi_set_bpp(uint16_t bpp)
124	{
125	#ifdef VGA_DEBUG
126	printf("vbe_set_bpp: %02x\n", bpp);
127	#endif
128	out_w(VBE_DISPI_IOPORT_INDEX, VBE_DISPI_INDEX_BPP);
129	out_w(VBE_DISPI_IOPORT_DATA, bpp);
130	}
131
132	uint16_t in_word(uint16_t port, uint16_t addr)
133	{
134	outw(port, addr);
135	return inw(port);
136	}
137
138	#ifdef VBE_NEW_DYN_LIST
139	uint8_t in_byte(uint16_t port, uint16_t addr)
140	{
141	outw(port, addr);
142	return inb(port);
143	}
144	#endif
145
146	/* Display "chip" identification helpers. */
147	static uint16_t dispi_get_id(void)
148	{
149	outw(VBE_DISPI_IOPORT_INDEX, VBE_DISPI_INDEX_ID);
150	return inw(VBE_DISPI_IOPORT_DATA);
151	}
152
153	static void dispi_set_id(uint16_t chip_id)
154	{
155	outw(VBE_DISPI_IOPORT_INDEX, VBE_DISPI_INDEX_ID);
156	outw(VBE_DISPI_IOPORT_DATA, chip_id);
157	}
158
159	/* VBE Init - Initialise the VESA BIOS Extension (VBE) support
160	* This function does a sanity check on the host side display code interface.
161	*/
162	void vbe_init(void)
163	{
164	dispi_set_id(VBE_DISPI_ID0);
165	if (dispi_get_id() == VBE_DISPI_ID0) {
166	/* VBE support was detected. */
167	write_byte(BIOSMEM_SEG, BIOSMEM_VBE_FLAG, 1);
168	dispi_set_id(VBE_DISPI_ID4);
169	}
170	#ifdef DEBUG_VGA
171	printf(msg_vbe_init);
172	#endif
173	}
174
175	/* Find the offset of the desired mode, given its number. */
176	#ifdef VBE_NEW_DYN_LIST
177	static uint16_t mode_info_find_mode(uint16_t mode, Boolean using_lfb)
178	{
179	uint16_t sig, vmode, attrs;
180	uint16_t cur_info_ofs; /* Current offset in mode list. */
181
182	/* Read and check the VBE Extra Data signature. */
183	sig = in_word(VBE_EXTRA_PORT, 0);
184	if (sig != VBEHEADER_MAGIC) {
185	#ifdef DEBUG_VGA
186	printf("Signature NOT found! %x\n", sig);
187	#endif
188	return 0;
189	}
190
191	cur_info_ofs = sizeof(VBEHeader);
192
193	vmode = in_word(VBE_EXTRA_PORT, cur_info_ofs + offsetof(ModeInfoListItem, mode)/&cur_info->mode/);
194	while (vmode != VBE_VESA_MODE_END_OF_LIST)
195	{
196	attrs = in_word(VBE_EXTRA_PORT, /&cur_info->info.ModeAttributes/cur_info_ofs + offsetof(ModeInfoListItem, info.ModeAttributes) );
197
198	if (vmode == mode)
199	{
200	if (!using_lfb)
201	return cur_info_ofs;
202	else if (attrs & VBE_MODE_ATTRIBUTE_LINEAR_FRAME_BUFFER_MODE)
203	return cur_info_ofs;
204	else {
205	cur_info_ofs += sizeof(ModeInfoListItem);
206	vmode = in_word(VBE_EXTRA_PORT, /&cur_info->mode/cur_info_ofs + offsetof(ModeInfoListItem, mode));
207	}
208	} else {
209	cur_info_ofs += sizeof(ModeInfoListItem);
210	vmode = in_word(VBE_EXTRA_PORT, /&cur_info->mode/cur_info_ofs + offsetof(ModeInfoListItem, mode));
211	}
212	}
213	return 0;
214	}
215	#else
216	static ModeInfoListItem* mode_info_find_mode(uint16_t mode, Boolean using_lfb)
217	{
218	ModeInfoListItem *cur_info = &mode_info_list;
219
220	while (cur_info->mode != VBE_VESA_MODE_END_OF_LIST)
221	{
222	if (cur_info->mode == mode)
223	{
224	if (!using_lfb)
225	return cur_info;
226	else if (cur_info->info.ModeAttributes & VBE_MODE_ATTRIBUTE_LINEAR_FRAME_BUFFER_MODE)
227	return cur_info;
228	else
229	cur_info++;
230	} else
231	cur_info++;
232	}
233	return 0;
234	}
235	#endif
236
237	#ifndef VBOX
238	; VBE Display Info - Display information on screen about the VBE
239
240	vbe_display_info:
241	call _vbe_has_vbe_display
242	test ax, ax
243	jz no_vbe_flag
244	mov ax, #0xc000
245	mov ds, ax
246	mov si, #_vbebios_info_string
247	jmp _display_string
248	no_vbe_flag:
249	mov ax, #0xc000
250	mov ds, ax
251	mov si, #_no_vbebios_info_string
252	jmp _display_string
253	#endif
254
255	/** Function 00h - Return VBE Controller Information
256	*
257	* Input:
258	* AX = 4F00h
259	* ES:DI = Pointer to buffer in which to place VbeInfoBlock structure
260	* (VbeSignature should be VBE2 when VBE 2.0 information is desired and
261	* the info block is 512 bytes in size)
262	* Output:
263	* AX = VBE Return Status
264	*
265	*/
266	void vbe_biosfn_return_controller_information(uint16_t STACK_BASED *AX, uint16_t ES, uint16_t DI)
267	{
268	uint16_t status;
269	uint16_t vbe2_info;
270	uint16_t cur_mode = 0;
271	uint16_t cur_ptr=34;
272	#ifdef VBE_NEW_DYN_LIST
273	uint16_t cur_info_ofs;
274	uint16_t sig, vmode;
275	#else
276	ModeInfoListItem *cur_info = &mode_info_list;
277	#endif
278	uint16_t max_bpp = dispi_get_max_bpp();
279	VbeInfoBlock __far *info_block;
280
281	info_block = ES :> (VbeInfoBlock *)DI;
282
283	#ifdef VBE_NEW_DYN_LIST
284	/* Read VBE Extra Data signature */
285	sig = in_word(VBE_EXTRA_PORT, 0);
286	if (sig != VBEHEADER_MAGIC)
287	{
288	*AX = 0x0100;
289	#ifdef DEBUG_VGA
290	printf("Signature NOT found\n");
291	#endif
292	return;
293	}
294	cur_info_ofs = sizeof(VBEHeader);
295	#endif
296	status = *AX;
297
298	#ifdef VGA_DEBUG
299	printf("VBE vbe_biosfn_return_vbe_info ES%x DI%x AX%x\n",ES,DI,status);
300	#endif
301
302	vbe2_info = 0;
303
304	/* Don't use a local copy of VbeInfoBlock on the stack; it's too big.
305	* The Ubuntu 8.04 64 bits splash screen emulator can't handle this.
306	*/
307	#ifdef VBE2_NO_VESA_CHECK
308	#else /* !VBE2_NO_VESA_CHECK */
309	// check for VBE2 signature
310	if (info_block->VbeSignature.Sig32 == SIG_VBE2 \|\| info_block->VbeSignature.Sig32 == SIG_VESA)
311	{
312	vbe2_info = 1;
313	#ifdef VGA_DEBUG
314	printf("VBE correct VESA/VBE2 signature found\n");
315	#endif
316	}
317	#endif /* !VBE2_NO_VESA_CHECK */
318
319	/* VBE Signature - the compiler will optimize this into something sane. */
320	info_block->VbeSignature.SigChr[0] = 'V';
321	info_block->VbeSignature.SigChr[1] = 'E';
322	info_block->VbeSignature.SigChr[2] = 'S';
323	info_block->VbeSignature.SigChr[3] = 'A';
324
325	/* VBE Version supported. */
326	info_block->VbeVersion = 0x0200; /* Version 2.0. */
327
328	/* OEM String. */
329	info_block->OemString.Ptr = &vbebios_copyright;
330
331	/* Capabilities if this implementation. */
332	info_block->Capabilities[0] = VBE_CAPABILITY_8BIT_DAC;
333	info_block->Capabilities[1] = 0;
334	info_block->Capabilities[2] = 0;
335	info_block->Capabilities[3] = 0;
336
337	/* Video mode list pointer (dynamically generated). */
338	info_block->VideoModePtr_Seg = ES;
339	info_block->VideoModePtr_Off = DI + 34;
340
341	/* Total controller memory in 64K units. */
342	info_block->TotalMemory = in_word(VBE_EXTRA_PORT, 0xffff);
343
344	if (vbe2_info)
345	{
346	/* OEM information. */
347	info_block->OemSoftwareRev = VBE_OEM_SOFTWARE_REV;
348	info_block->OemVendorName.Ptr = &vbebios_vendor_name;
349	info_block->OemProductName.Ptr = &vbebios_product_name;
350	info_block->OemProductRev.Ptr = &vbebios_product_revision;
351	}
352
353	#ifdef VBE_NEW_DYN_LIST
354	do
355	{
356	uint8_t data_b;
357
358	data_b = in_byte(VBE_EXTRA_PORT, cur_info_ofs + offsetof(ModeInfoListItem, info.BitsPerPixel) /&cur_info->info.BitsPerPixel/);
359	if (data_b <= max_bpp)
360	{
361	vmode = in_word(VBE_EXTRA_PORT, cur_info_ofs + offsetof(ModeInfoListItem, mode)/&cur_info->mode/);
362	#ifdef VGA_DEBUG
363	printf("VBE found mode %x => %x\n", vmode, cur_mode);
364	#endif
365	write_word(ES, DI + cur_ptr, vmode);
366	cur_mode++;
367	cur_ptr+=2;
368	}
369	cur_info_ofs += sizeof(ModeInfoListItem);
370	vmode = in_word(VBE_EXTRA_PORT, cur_info_ofs + offsetof(ModeInfoListItem, mode)/&cur_info->mode/);
371	} while (vmode != VBE_VESA_MODE_END_OF_LIST);
372
373	// Add vesa mode list terminator
374	write_word(ES, DI + cur_ptr, vmode);
375	#else
376	do
377	{
378	if (cur_info->info.BitsPerPixel <= max_bpp) {
379	#ifdef VGA_DEBUG
380	printf("VBE found mode %x => %x\n", cur_info->mode,cur_mode);
381	#endif
382	write_word(ES, DI + cur_ptr, cur_info->mode);
383	cur_mode++;
384	cur_ptr += 2;
385	}
386	cur_info++;
387	} while (cur_info->mode != VBE_VESA_MODE_END_OF_LIST);
388
389	// Add vesa mode list terminator
390	write_word(ES, DI + cur_ptr, cur_info->mode);
391	#endif // VBE_NEW_DYN_LIST
392	*AX = 0x004F;
393	}
394
395	/** Function 01h - Return VBE Mode Information
396	*
397	* Input:
398	* AX = 4F01h
399	* CX = Mode Number
400	* ES:DI = Pointer to buffer in which to place ModeInfoBlock structure
401	* Output:
402	* AX = VBE Return Status
403	*
404	*/
405	void vbe_biosfn_return_mode_information(uint16_t STACK_BASED *AX, uint16_t CX, uint16_t ES, uint16_t DI)
406	{
407	uint16_t result = 0x0100;
408	#ifdef VBE_NEW_DYN_LIST
409	uint16_t cur_info_ofs;
410	#else
411	ModeInfoListItem *cur_info;
412	#endif
413	Boolean using_lfb;
414	uint8_t win_attr;
415
416	#ifdef VGA_DEBUG
417	printf("VBE vbe_biosfn_return_mode_information ES%x DI%x CX%x\n",ES,DI,CX);
418	#endif
419
420	using_lfb = ((CX & VBE_MODE_LINEAR_FRAME_BUFFER) == VBE_MODE_LINEAR_FRAME_BUFFER);
421	CX = (CX & 0x1ff);
422
423	#ifdef VBE_NEW_DYN_LIST
424	cur_info_ofs = mode_info_find_mode(CX, using_lfb);
425
426	if (cur_info_ofs) {
427	uint16_t i;
428	#else
429	cur_info = mode_info_find_mode(CX, using_lfb);
430
431	if (cur_info != 0) {
432	#endif
433	#ifdef VGA_DEBUG
434	printf("VBE found mode %x\n",CX);
435	#endif
436	memsetb(ES, DI, 0, 256); // The mode info size is fixed
437	#ifdef VBE_NEW_DYN_LIST
438	for (i = 0; i < sizeof(ModeInfoBlockCompact); i++) {
439	uint8_t b;
440
441	b = in_byte(VBE_EXTRA_PORT, cur_info_ofs + offsetof(ModeInfoListItem, info) + i/(char )(&(cur_info->info)) + i*/);
442	write_byte(ES, DI + i, b);
443	}
444	#else
445	memcpyb(ES, DI, 0xc000, &(cur_info->info), sizeof(ModeInfoBlockCompact));
446	#endif
447	win_attr = read_byte(ES, DI + offsetof(ModeInfoBlock, WinAAttributes));
448	if (win_attr & VBE_WINDOW_ATTRIBUTE_RELOCATABLE) {
449	write_word(ES, DI + offsetof(ModeInfoBlock, WinFuncPtr), (uint16_t)(dispi_set_bank_farcall));
450	// If BIOS not at 0xC000 -> boom
451	write_word(ES, DI + offsetof(ModeInfoBlock, WinFuncPtr) + 2, 0xC000);
452	}
453	// Update the LFB physical address which may change at runtime
454	out_w(VBE_DISPI_IOPORT_INDEX, VBE_DISPI_INDEX_FB_BASE_HI);
455	write_word(ES, DI + offsetof(ModeInfoBlock, PhysBasePtr) + 2, in_w(VBE_DISPI_IOPORT_DATA));
456
457	result = 0x4f;
458	} else {
459	#ifdef VGA_DEBUG
460	printf("VBE NOT found mode %x\n",CX);
461	#endif
462	result = 0x100;
463	}
464
465	*AX = result;
466	}
467
468	/** Function 02h - Set VBE Mode
469	*
470	* Input:
471	* AX = 4F02h
472	* BX = Desired Mode to set
473	* ES:DI = Pointer to CRTCInfoBlock structure
474	* Output:
475	* AX = VBE Return Status
476	*
477	*/
478	void vbe_biosfn_set_mode(uint16_t STACK_BASED *AX, uint16_t BX, uint16_t ES, uint16_t DI)
479	{
480	uint16_t result;
481	#ifdef VBE_NEW_DYN_LIST
482	uint16_t cur_info_ofs;
483	#else
484	ModeInfoListItem *cur_info;
485	#endif
486	Boolean using_lfb;
487	uint8_t no_clear;
488	uint8_t lfb_flag;
489
490	using_lfb = ((BX & VBE_MODE_LINEAR_FRAME_BUFFER) == VBE_MODE_LINEAR_FRAME_BUFFER);
491	lfb_flag = using_lfb ? VBE_DISPI_LFB_ENABLED : 0;
492	no_clear = ((BX & VBE_MODE_PRESERVE_DISPLAY_MEMORY) == VBE_MODE_PRESERVE_DISPLAY_MEMORY) ? VBE_DISPI_NOCLEARMEM : 0;
493
494	BX = (BX & 0x1ff);
495
496	// check for non vesa mode
497	if (BX < VBE_MODE_VESA_DEFINED)
498	{
499	uint8_t mode;
500
501	dispi_set_enable(VBE_DISPI_DISABLED);
502	// call the vgabios in order to set the video mode
503	// this allows for going back to textmode with a VBE call (some applications expect that to work)
504	mode = (BX & 0xff);
505	biosfn_set_video_mode(mode);
506	result = 0x4f;
507	goto leave;
508	}
509
510	#ifdef VBE_NEW_DYN_LIST
511	cur_info_ofs = mode_info_find_mode(BX, using_lfb);
512
513	if (cur_info_ofs != 0)
514	{
515	uint16_t xres, yres;
516	uint8_t bpp;
517
518	xres = in_word(VBE_EXTRA_PORT, cur_info_ofs + offsetof(ModeInfoListItem, info.XResolution) /&cur_info->info.XResolution/);
519	yres = in_word(VBE_EXTRA_PORT, cur_info_ofs + offsetof(ModeInfoListItem, info.YResolution) /&cur_info->info.YResolution/);
520	bpp = in_byte(VBE_EXTRA_PORT, cur_info_ofs + offsetof(ModeInfoListItem, info.BitsPerPixel) /&cur_info->info.BitsPerPixel/);
521
522	#ifdef VGA_DEBUG
523	printf("VBE found mode %x, setting:\n", BX);
524	printf("\txres%x yres%x bpp%x\n", xres, yres, bpp);
525	#endif
526	#else
527	cur_info = mode_info_find_mode(BX, using_lfb);
528
529	if (cur_info != 0)
530	{
531	#ifdef VGA_DEBUG
532	printf("VBE found mode %x, setting:\n", BX);
533	printf("\txres%x yres%x bpp%x\n",
534	cur_info->info.XResolution,
535	cur_info->info.YResolution,
536	cur_info->info.BitsPerPixel);
537	#endif
538	#endif // VBE_NEW_DYN_LIST
539
540	// first disable current mode (when switching between vesa modi)
541	dispi_set_enable(VBE_DISPI_DISABLED);
542
543	#ifdef VBE_NEW_DYN_LIST
544	if (bpp == 4)
545	#else
546	if (cur_info->info.BitsPerPixel == 4)
547	#endif
548	{
549	biosfn_set_video_mode(0x6a);
550	}
551
552	#ifdef VBE_NEW_DYN_LIST
553	dispi_set_bpp(bpp);
554	dispi_set_xres(xres);
555	dispi_set_yres(yres);
556	#else
557	dispi_set_bpp(cur_info->info.BitsPerPixel);
558	dispi_set_xres(cur_info->info.XResolution);
559	dispi_set_yres(cur_info->info.YResolution);
560	#endif
561	dispi_set_bank(0);
562	dispi_set_enable(VBE_DISPI_ENABLED \| no_clear \| lfb_flag);
563	vga_compat_setup();
564
565	write_word(BIOSMEM_SEG,BIOSMEM_VBE_MODE,BX);
566	write_byte(BIOSMEM_SEG,BIOSMEM_VIDEO_CTL,(0x60 \| no_clear));
567
568	result = 0x4f;
569	}
570	else
571	{
572	#ifdef VGA_DEBUG
573	printf("VBE NOT found mode %x\n" , BX);
574	#endif
575	result = 0x100;
576	}
577
578	leave:
579	*AX = result;
580	}
581
582	uint16_t vbe_biosfn_read_video_state_size(void)
583	{
584	return 9 * 2;
585	}
586
587	void vbe_biosfn_save_video_state(uint16_t ES, uint16_t BX)
588	{
589	uint16_t enable, i;
590
591	outw(VBE_DISPI_IOPORT_INDEX,VBE_DISPI_INDEX_ENABLE);
592	enable = inw(VBE_DISPI_IOPORT_DATA);
593	write_word(ES, BX, enable);
594	BX += 2;
595	if (!(enable & VBE_DISPI_ENABLED))
596	return;
597	for(i = VBE_DISPI_INDEX_XRES; i <= VBE_DISPI_INDEX_Y_OFFSET; i++) {
598	if (i != VBE_DISPI_INDEX_ENABLE) {
599	outw(VBE_DISPI_IOPORT_INDEX, i);
600	write_word(ES, BX, inw(VBE_DISPI_IOPORT_DATA));
601	BX += 2;
602	}
603	}
604	}
605
606
607	void vbe_biosfn_restore_video_state(uint16_t ES, uint16_t BX)
608	{
609	uint16_t enable, i;
610
611	enable = read_word(ES, BX);
612	BX += 2;
613
614	if (!(enable & VBE_DISPI_ENABLED)) {
615	outw(VBE_DISPI_IOPORT_INDEX,VBE_DISPI_INDEX_ENABLE);
616	outw(VBE_DISPI_IOPORT_DATA, enable);
617	} else {
618	outw(VBE_DISPI_IOPORT_INDEX, VBE_DISPI_INDEX_XRES);
619	outw(VBE_DISPI_IOPORT_DATA, read_word(ES, BX));
620	BX += 2;
621	outw(VBE_DISPI_IOPORT_INDEX, VBE_DISPI_INDEX_YRES);
622	outw(VBE_DISPI_IOPORT_DATA, read_word(ES, BX));
623	BX += 2;
624	outw(VBE_DISPI_IOPORT_INDEX, VBE_DISPI_INDEX_BPP);
625	outw(VBE_DISPI_IOPORT_DATA, read_word(ES, BX));
626	BX += 2;
627	outw(VBE_DISPI_IOPORT_INDEX,VBE_DISPI_INDEX_ENABLE);
628	outw(VBE_DISPI_IOPORT_DATA, enable);
629
630	for(i = VBE_DISPI_INDEX_BANK; i <= VBE_DISPI_INDEX_Y_OFFSET; i++) {
631	outw(VBE_DISPI_IOPORT_INDEX, i);
632	outw(VBE_DISPI_IOPORT_DATA, read_word(ES, BX));
633	BX += 2;
634	}
635	}
636	}
637
638	/** Function 04h - Save/Restore State
639	*
640	* Input:
641	* AX = 4F04h
642	* DL = 00h Return Save/Restore State buffer size
643	* 01h Save State
644	* 02h Restore State
645	* CX = Requested states
646	* ES:BX = Pointer to buffer (if DL <> 00h)
647	* Output:
648	* AX = VBE Return Status
649	* BX = Number of 64-byte blocks to hold the state buffer (if DL=00h)
650	*
651	*/
652	void vbe_biosfn_save_restore_state(uint16_t STACK_BASED *AX, uint16_t CX, uint16_t DX,
653	uint16_t ES, uint16_t STACK_BASED *BX)
654	{
655	uint16_t result, val;
656
657	result = 0x004F;
658	switch(GET_DL()) {
659	case 0x00:
660	val = biosfn_read_video_state_size2(CX);
661	#ifdef VGA_DEBUG
662	printf("VGA state size=%x\n", val);
663	#endif
664	if (CX & 8)
665	val += vbe_biosfn_read_video_state_size();
666	*BX = (val + 63) / 64;
667	break;
668	case 0x01:
669	val = *BX;
670	val = biosfn_save_video_state(CX, ES, val);
671	#ifdef VGA_DEBUG
672	printf("VGA save_state offset=%x\n", val);
673	#endif
674	if (CX & 8)
675	vbe_biosfn_save_video_state(ES, val);
676	break;
677	case 0x02:
678	val = *BX;
679	val = biosfn_restore_video_state(CX, ES, val);
680	#ifdef VGA_DEBUG
681	printf("VGA restore_state offset=%x\n", val);
682	#endif
683	if (CX & 8)
684	vbe_biosfn_restore_video_state(ES, val);
685	break;
686	default:
687	// function failed
688	result = 0x100;
689	break;
690	}
691	*AX = result;
692	}

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source: vbox/trunk/src/VBox/Devices/Graphics/BIOS/vbe.c@ 46495

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