Edid.c

Last change on this file was 106061, checked in by vboxsync, 4 months ago
Copyright year updates by scm.
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 20.8 KB

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1	/* $Id: Edid.c 106061 2024-09-16 14:03:52Z vboxsync $ */
2	/** @file
3	* Edid.c
4	*/
5
6	/*
7	* Copyright (C) 2009-2024 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* The contents of this file may alternatively be used under the terms
26	* of the Common Development and Distribution License Version 1.0
27	* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28	* in the VirtualBox distribution, in which case the provisions of the
29	* CDDL are applicable instead of those of the GPL.
30	*
31	* You may elect to license modified versions of this file under the
32	* terms and conditions of either the GPL or the CDDL or both.
33	*
34	* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35	*/
36
37	/*
38	This code is based on:
39
40	Read EDID information and parse EDID information.
41
42	Copyright (c) 2008, Intel Corporation
43	All rights reserved. This program and the accompanying materials
44	are licensed and made available under the terms and conditions of the BSD License
45	which accompanies this distribution. The full text of the license may be found at
46	http://opensource.org/licenses/bsd-license.php
47
48	THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
49	WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
50
51	*/
52
53	#include "VBoxVga.h"
54	#include "VBoxVgaI2c.h"
55
56	//
57	// EDID block
58	//
59	typedef struct {
60	UINT8 Header[8]; //EDID header "00 FF FF FF FF FF FF 00"
61	UINT16 ManufactureName; //EISA 3-character ID
62	UINT16 ProductCode; //Vendor assigned code
63	UINT32 SerialNumber; //32-bit serial number
64	UINT8 WeekOfManufacture; //Week number
65	UINT8 YearOfManufacture; //Year
66	UINT8 EdidVersion; //EDID Structure Version
67	UINT8 EdidRevision; //EDID Structure Revision
68	UINT8 VideoInputDefinition;
69	UINT8 MaxHorizontalImageSize; //cm
70	UINT8 MaxVerticalImageSize; //cm
71	UINT8 DisplayTransferCharacteristic;
72	UINT8 FeatureSupport;
73	UINT8 RedGreenLowBits; //Rx1 Rx0 Ry1 Ry0 Gx1 Gx0 Gy1Gy0
74	UINT8 BlueWhiteLowBits; //Bx1 Bx0 By1 By0 Wx1 Wx0 Wy1 Wy0
75	UINT8 RedX; //Red-x Bits 9 - 2
76	UINT8 RedY; //Red-y Bits 9 - 2
77	UINT8 GreenX; //Green-x Bits 9 - 2
78	UINT8 GreenY; //Green-y Bits 9 - 2
79	UINT8 BlueX; //Blue-x Bits 9 - 2
80	UINT8 BlueY; //Blue-y Bits 9 - 2
81	UINT8 WhiteX; //White-x Bits 9 - 2
82	UINT8 WhiteY; //White-x Bits 9 - 2
83	UINT8 EstablishedTimings[3];
84	UINT8 StandardTimingIdentification[16];
85	UINT8 DetailedTimingDescriptions[72];
86	UINT8 ExtensionFlag; //Number of (optional) 128-byte EDID extension blocks to follow
87	UINT8 Checksum;
88	} EDID_BLOCK;
89
90	#define EDID_BLOCK_SIZE 128
91	#define VBE_EDID_ESTABLISHED_TIMING_MAX_NUMBER 17
92
93	typedef struct {
94	UINT16 HorizontalResolution;
95	UINT16 VerticalResolution;
96	UINT16 RefreshRate;
97	} EDID_TIMING;
98
99	typedef struct {
100	UINT32 ValidNumber;
101	UINT32 Key[VBE_EDID_ESTABLISHED_TIMING_MAX_NUMBER];
102	} VALID_EDID_TIMING;
103
104	//
105	// Standard timing defined by VESA EDID
106	//
107	EDID_TIMING mVbeEstablishedEdidTiming[] = {
108	//
109	// Established Timing I
110	//
111	{800, 600, 60},
112	{800, 600, 56},
113	{640, 480, 75},
114	{640, 480, 72},
115	{640, 480, 67},
116	{640, 480, 60},
117	{720, 400, 88},
118	{720, 400, 70},
119	//
120	// Established Timing II
121	//
122	{1280, 1024, 75},
123	{1024, 768, 75},
124	{1024, 768, 70},
125	{1024, 768, 60},
126	{1024, 768, 87},
127	{832, 624, 75},
128	{800, 600, 75},
129	{800, 600, 72},
130	//
131	// Established Timing III
132	//
133	{1152, 870, 75}
134	};
135
136	/**
137	Read EDID information from I2C Bus on CirrusLogic.
138
139	@param Private Pointer to VBOX_VGA_PRIVATE_DATA.
140	@param EdidDataBlock Pointer to EDID data block.
141	@param EdidSize Returned EDID block size.
142
143	@retval EFI_UNSUPPORTED
144	@retval EFI_SUCCESS
145
146	**/
147	EFI_STATUS
148	ReadEdidData (
149	VBOX_VGA_PRIVATE_DATA *Private,
150	UINT8 **EdidDataBlock,
151	UINTN *EdidSize
152	)
153	{
154	UINTN Index;
155	UINT8 EdidData[EDID_BLOCK_SIZE * 2];
156	UINT8 *ValidEdid;
157	UINT64 Signature;
158
159	for (Index = 0; Index < EDID_BLOCK_SIZE * 2; Index ++) {
160	I2cReadByte (Private->PciIo, 0xa0, (UINT8)Index, &EdidData[Index]);
161	}
162
163	//
164	// Search for the EDID signature
165	//
166	ValidEdid = &EdidData[0];
167	Signature = 0x00ffffffffffff00ull;
168	for (Index = 0; Index < EDID_BLOCK_SIZE * 2; Index ++, ValidEdid ++) {
169	if (CompareMem (ValidEdid, &Signature, 8) == 0) {
170	break;
171	}
172	}
173
174	if (Index == 256) {
175	//
176	// No EDID signature found
177	//
178	return EFI_UNSUPPORTED;
179	}
180
181	*EdidDataBlock = AllocateCopyPool (
182	sizeof (EDID_BLOCK_SIZE),
183	ValidEdid
184	);
185	if (*EdidDataBlock == NULL) {
186	return EFI_OUT_OF_RESOURCES;
187	}
188
189	//
190	// Currently only support EDID 1.x
191	//
192	*EdidSize = EDID_BLOCK_SIZE;
193
194	return EFI_SUCCESS;
195	}
196
197	/**
198	Generate a search key for a specified timing data.
199
200	@param EdidTiming Pointer to EDID timing
201
202	@return The 32 bit unique key for search.
203
204	**/
205	UINT32
206	CalculateEdidKey (
207	EDID_TIMING *EdidTiming
208	)
209	{
210	UINT32 Key;
211
212	//
213	// Be sure no conflicts for all standard timing defined by VESA.
214	//
215	Key = (EdidTiming->HorizontalResolution * 2) + EdidTiming->VerticalResolution;
216	return Key;
217	}
218
219	/**
220	Search a specified Timing in all the valid EDID timings.
221
222	@param ValidEdidTiming All valid EDID timing information.
223	@param EdidTiming The Timing to search for.
224
225	@retval TRUE Found.
226	@retval FALSE Not found.
227
228	**/
229	BOOLEAN
230	SearchEdidTiming (
231	VALID_EDID_TIMING *ValidEdidTiming,
232	EDID_TIMING *EdidTiming
233	)
234	{
235	UINT32 Index;
236	UINT32 Key;
237
238	Key = CalculateEdidKey (EdidTiming);
239
240	for (Index = 0; Index < ValidEdidTiming->ValidNumber; Index ++) {
241	if (Key == ValidEdidTiming->Key[Index]) {
242	return TRUE;
243	}
244	}
245
246	return FALSE;
247	}
248
249	/**
250	Parse the Established Timing and Standard Timing in EDID data block.
251
252	@param EdidBuffer Pointer to EDID data block
253	@param ValidEdidTiming Valid EDID timing information
254
255	@retval TRUE The EDID data is valid.
256	@retval FALSE The EDID data is invalid.
257
258	**/
259	BOOLEAN
260	ParseEdidData (
261	UINT8 *EdidBuffer,
262	VALID_EDID_TIMING *ValidEdidTiming
263	)
264	{
265	UINT8 CheckSum;
266	UINT32 Index;
267	UINT32 ValidNumber;
268	UINT32 TimingBits;
269	UINT8 *BufferIndex;
270	UINT16 HorizontalResolution;
271	UINT16 VerticalResolution;
272	UINT8 AspectRatio;
273	UINT8 RefreshRate;
274	EDID_TIMING TempTiming;
275	EDID_BLOCK *EdidDataBlock;
276
277	EdidDataBlock = (EDID_BLOCK *) EdidBuffer;
278
279	//
280	// Check the checksum of EDID data
281	//
282	CheckSum = 0;
283	for (Index = 0; Index < EDID_BLOCK_SIZE; Index ++) {
284	CheckSum = (UINT8) (CheckSum + EdidBuffer[Index]);
285	}
286	if (CheckSum != 0) {
287	return FALSE;
288	}
289
290	ValidNumber = 0;
291	SetMem (ValidEdidTiming, sizeof (VALID_EDID_TIMING), 0);
292
293	if ((EdidDataBlock->EstablishedTimings[0] != 0) \|\|
294	(EdidDataBlock->EstablishedTimings[1] != 0) \|\|
295	(EdidDataBlock->EstablishedTimings[2] != 0)
296	) {
297	//
298	// Established timing data
299	//
300	TimingBits = EdidDataBlock->EstablishedTimings[0] \|
301	(EdidDataBlock->EstablishedTimings[1] << 8) \|
302	((EdidDataBlock->EstablishedTimings[2] & 0x80) << 9) ;
303	for (Index = 0; Index < VBE_EDID_ESTABLISHED_TIMING_MAX_NUMBER; Index ++) {
304	if (TimingBits & 0x1) {
305	ValidEdidTiming->Key[ValidNumber] = CalculateEdidKey (&mVbeEstablishedEdidTiming[Index]);
306	ValidNumber ++;
307	}
308	TimingBits = TimingBits >> 1;
309	}
310	} else {
311	//
312	// If no Established timing data, read the standard timing data
313	//
314	BufferIndex = &EdidDataBlock->StandardTimingIdentification[0];
315	for (Index = 0; Index < 8; Index ++) {
316	if ((BufferIndex[0] != 0x1) && (BufferIndex[1] != 0x1)){
317	//
318	// A valid Standard Timing
319	//
320	HorizontalResolution = (UINT16) (BufferIndex[0] * 8 + 248);
321	AspectRatio = (UINT8) (BufferIndex[1] >> 6);
322	switch (AspectRatio) {
323	case 0:
324	VerticalResolution = (UINT16) (HorizontalResolution / 16 * 10);
325	break;
326	case 1:
327	VerticalResolution = (UINT16) (HorizontalResolution / 4 * 3);
328	break;
329	case 2:
330	VerticalResolution = (UINT16) (HorizontalResolution / 5 * 4);
331	break;
332	case 3:
333	VerticalResolution = (UINT16) (HorizontalResolution / 16 * 9);
334	break;
335	default:
336	VerticalResolution = (UINT16) (HorizontalResolution / 4 * 3);
337	break;
338	}
339	RefreshRate = (UINT8) ((BufferIndex[1] & 0x1f) + 60);
340	TempTiming.HorizontalResolution = HorizontalResolution;
341	TempTiming.VerticalResolution = VerticalResolution;
342	TempTiming.RefreshRate = RefreshRate;
343	ValidEdidTiming->Key[ValidNumber] = CalculateEdidKey (&TempTiming);
344	ValidNumber ++;
345	}
346	BufferIndex += 2;
347	}
348	}
349
350	ValidEdidTiming->ValidNumber = ValidNumber;
351	return TRUE;
352	}
353
354	static uint16_t in_word(uint16_t port, uint16_t addr)
355	{
356	ASMOutU16(port, addr);
357	return ASMInU16(port);
358	}
359
360	static EFI_STATUS VBoxVgaVideoModeInitExtra(void)
361	{
362	UINT16 w, cur_info_ofs, vmode, xres, yres;
363	UINTN Index;
364	VBOX_VGA_VIDEO_MODES *VideoMode;
365
366	// Read and check the VBE Extra Data magic
367	w = in_word(VBE_EXTRA_PORT, 0);
368	if (w != VBEHEADER_MAGIC) {
369	DEBUG((DEBUG_INFO, "%a:%d could not find VBE magic, got %x\n", __FILE__, __LINE__, w));
370	return EFI_NOT_FOUND;
371	}
372
373	cur_info_ofs = sizeof(VBEHeader);
374
375	Index = VBoxVgaVideoModeCount - 16;
376	VideoMode = &VBoxVgaVideoModes[Index];
377	vmode = in_word(VBE_EXTRA_PORT, cur_info_ofs + OFFSET_OF(ModeInfoListItem, mode));
378	while (vmode != VBE_VESA_MODE_END_OF_LIST)
379	{
380	xres = in_word(VBE_EXTRA_PORT, cur_info_ofs + OFFSET_OF(ModeInfoListItem, info.XResolution));
381	yres = in_word(VBE_EXTRA_PORT, cur_info_ofs + OFFSET_OF(ModeInfoListItem, info.YResolution));
382
383	if (vmode >= VBE_VBOX_MODE_CUSTOM1 && vmode <= VBE_VBOX_MODE_CUSTOM16 && xres && yres && Index < VBoxVgaVideoModeCount) {
384	VideoMode->Width = xres;
385	VideoMode->Height = yres;
386	VideoMode->ColorDepth = 32;
387	VideoMode->RefreshRate = 60;
388	VideoMode->MiscSetting = 0x01;
389	VideoMode++;
390	Index++;
391	}
392
393	cur_info_ofs += sizeof(ModeInfoListItem);
394	vmode = in_word(VBE_EXTRA_PORT, cur_info_ofs + OFFSET_OF(ModeInfoListItem, mode));
395	}
396	return EFI_SUCCESS;
397	}
398
399	/**
400	Construct the valid video modes for VBoxVga.
401
402	**/
403	EFI_STATUS
404	VBoxVgaVideoModeSetup (
405	VBOX_VGA_PRIVATE_DATA *Private
406	)
407	{
408	EFI_STATUS Status;
409	UINT32 Index;
410	BOOLEAN EdidFound;
411	EFI_EDID_OVERRIDE_PROTOCOL *EdidOverride;
412	UINT32 EdidAttributes;
413	BOOLEAN EdidOverrideFound;
414	UINTN EdidOverrideDataSize;
415	UINT8 *EdidOverrideDataBlock;
416	UINTN EdidDiscoveredDataSize;
417	UINT8 *EdidDiscoveredDataBlock;
418	UINTN EdidActiveDataSize;
419	UINT8 *EdidActiveDataBlock;
420	VALID_EDID_TIMING ValidEdidTiming;
421	UINT32 ValidModeCount;
422	VBOX_VGA_MODE_DATA *ModeData;
423	BOOLEAN TimingMatch;
424	const VBOX_VGA_VIDEO_MODES *VideoMode;
425	EDID_TIMING TempTiming;
426
427	//
428	// setup EDID information
429	//
430	Private->EdidDiscovered.Edid = NULL;
431	Private->EdidDiscovered.SizeOfEdid = 0;
432	Private->EdidActive.Edid = NULL;
433	Private->EdidActive.SizeOfEdid = 0;
434
435	EdidFound = FALSE;
436	EdidOverrideFound = FALSE;
437	EdidAttributes = 0xff;
438	EdidOverrideDataSize = 0;
439	EdidOverrideDataBlock = NULL;
440	EdidActiveDataSize = 0;
441	EdidActiveDataBlock = NULL;
442	EdidDiscoveredDataBlock = NULL;
443
444	//
445	// Find EDID Override protocol firstly, this protocol is installed by platform if needed.
446	//
447	Status = gBS->LocateProtocol (
448	&gEfiEdidOverrideProtocolGuid,
449	NULL,
450	(VOID **) &EdidOverride
451	);
452	if (!EFI_ERROR (Status)) {
453	//
454	// Allocate double size of VESA_BIOS_EXTENSIONS_EDID_BLOCK_SIZE to avoid overflow
455	//
456	EdidOverrideDataBlock = AllocatePool (sizeof (EDID_BLOCK_SIZE * 2));
457	if (NULL == EdidOverrideDataBlock) {
458	Status = EFI_OUT_OF_RESOURCES;
459	goto Done;
460	}
461
462	Status = EdidOverride->GetEdid (
463	EdidOverride,
464	Private->Handle,
465	&EdidAttributes,
466	&EdidOverrideDataSize,
467	(UINT8 **) &EdidOverrideDataBlock
468	);
469	if (!EFI_ERROR (Status) &&
470	EdidAttributes == 0 &&
471	EdidOverrideDataSize != 0) {
472	//
473	// Succeeded to get EDID Override Data
474	//
475	EdidOverrideFound = TRUE;
476	}
477	}
478
479	if (EdidOverrideFound != TRUE \|\| EdidAttributes == EFI_EDID_OVERRIDE_DONT_OVERRIDE) {
480	//
481	// If EDID Override data doesn't exist or EFI_EDID_OVERRIDE_DONT_OVERRIDE returned,
482	// read EDID information through I2C Bus
483	//
484	if (ReadEdidData (Private, &EdidDiscoveredDataBlock, &EdidDiscoveredDataSize) == EFI_SUCCESS) {
485	Private->EdidDiscovered.SizeOfEdid = (UINT32) EdidDiscoveredDataSize;
486	Private->EdidDiscovered.Edid = (UINT8 *) AllocateCopyPool (
487	EdidDiscoveredDataSize,
488	EdidDiscoveredDataBlock
489	);
490
491	if (NULL == Private->EdidDiscovered.Edid) {
492	Status = EFI_OUT_OF_RESOURCES;
493	goto Done;
494	}
495
496	EdidActiveDataSize = Private->EdidDiscovered.SizeOfEdid;
497	EdidActiveDataBlock = Private->EdidDiscovered.Edid;
498
499	EdidFound = TRUE;
500	}
501	}
502
503	if (EdidFound != TRUE && EdidOverrideFound == TRUE) {
504	EdidActiveDataSize = EdidOverrideDataSize;
505	EdidActiveDataBlock = EdidOverrideDataBlock;
506	EdidFound = TRUE;
507	}
508
509	if (EdidFound == TRUE) {
510	//
511	// Parse EDID data structure to retrieve modes supported by monitor
512	//
513	if (ParseEdidData ((UINT8 *) EdidActiveDataBlock, &ValidEdidTiming) == TRUE) {
514	//
515	// Copy EDID Override Data to EDID Active Data
516	//
517	Private->EdidActive.SizeOfEdid = (UINT32) EdidActiveDataSize;
518	Private->EdidActive.Edid = (UINT8 *) AllocateCopyPool (
519	EdidActiveDataSize,
520	EdidActiveDataBlock
521	);
522	if (NULL == Private->EdidActive.Edid) {
523	Status = EFI_OUT_OF_RESOURCES;
524	goto Done;
525	}
526	}
527	} else {
528	Private->EdidActive.SizeOfEdid = 0;
529	Private->EdidActive.Edid = NULL;
530	EdidFound = FALSE;
531	}
532
533	if (EdidFound && 0) {
534	//
535	// Initialize the private mode data with the supported modes.
536	//
537	ValidModeCount = 0;
538	Private->ModeData = AllocatePool(sizeof(VBOX_VGA_MODE_DATA) * VBoxVgaVideoModeCount);
539	ModeData = &Private->ModeData[0];
540	VideoMode = &VBoxVgaVideoModes[0];
541	for (Index = 0; Index < VBoxVgaVideoModeCount; Index++) {
542
543	TimingMatch = TRUE;
544
545	//
546	// Check whether match with VBoxVga video mode
547	//
548	TempTiming.HorizontalResolution = (UINT16) VideoMode->Width;
549	TempTiming.VerticalResolution = (UINT16) VideoMode->Height;
550	TempTiming.RefreshRate = (UINT16) VideoMode->RefreshRate;
551	if (SearchEdidTiming (&ValidEdidTiming, &TempTiming) != TRUE) {
552	TimingMatch = FALSE;
553	}
554
555	//
556	// Not export Mode 0x0 as GOP mode, this is not defined in spec.
557	//
558	if ((VideoMode->Width == 0) \|\| (VideoMode->Height == 0)) {
559	TimingMatch = FALSE;
560	}
561
562	//
563	// Check whether the mode would be exceeding the VRAM size.
564	//
565	if (VideoMode->Width * VideoMode->Height * (VideoMode->ColorDepth / 8) > Private->VRAMSize) {
566	TimingMatch = FALSE;
567	}
568
569	if (TimingMatch) {
570	ModeData->ModeNumber = Index;
571	ModeData->HorizontalResolution = VideoMode->Width;
572	ModeData->VerticalResolution = VideoMode->Height;
573	ModeData->ColorDepth = VideoMode->ColorDepth;
574	ModeData->RefreshRate = VideoMode->RefreshRate;
575
576	ModeData ++;
577	ValidModeCount ++;
578	}
579
580	VideoMode ++;
581	}
582	} else {
583	//
584	// If EDID information wasn't found
585	//
586	VBoxVgaVideoModeInitExtra();
587	ValidModeCount = 0;
588	Private->ModeData = AllocatePool(sizeof(VBOX_VGA_MODE_DATA) * VBoxVgaVideoModeCount);
589	ModeData = &Private->ModeData[0];
590	VideoMode = &VBoxVgaVideoModes[0];
591	for (Index = 0; Index < VBoxVgaVideoModeCount; Index ++) {
592
593	TimingMatch = TRUE;
594
595	//
596	// Not export Mode 0x0 as GOP mode, this is not defined in spec.
597	//
598	if ((VideoMode->Width == 0) \|\| (VideoMode->Height == 0)) {
599	TimingMatch = FALSE;
600	}
601
602	//
603	// Check whether the mode would be exceeding the VRAM size.
604	//
605	if (VideoMode->Width * VideoMode->Height * (VideoMode->ColorDepth / 8) > Private->VRAMSize) {
606	TimingMatch = FALSE;
607	}
608
609	if (TimingMatch) {
610	ModeData->ModeNumber = Index;
611	ModeData->HorizontalResolution = VideoMode->Width;
612	ModeData->VerticalResolution = VideoMode->Height;
613	ModeData->ColorDepth = VideoMode->ColorDepth;
614	ModeData->RefreshRate = VideoMode->RefreshRate;
615
616	ModeData ++;
617	ValidModeCount ++;
618	}
619
620	VideoMode ++;
621	}
622	}
623
624	// Sort list of video modes (keeping duplicates) by increasing X, then Y,
625	// then the mode number. This way the custom modes are not overriding the
626	// default modes if they are for the same resolution.
627	ModeData = &Private->ModeData[0];
628	for (Index = 0; Index < ValidModeCount - 1; Index ++) {
629	UINT32 Index2;
630	VBOX_VGA_MODE_DATA *ModeData2 = ModeData + 1;
631	for (Index2 = Index + 1; Index2 < ValidModeCount; Index2 ++) {
632	if ( ModeData->HorizontalResolution > ModeData2->HorizontalResolution
633	\|\| ( ModeData->HorizontalResolution == ModeData2->HorizontalResolution
634	&& ModeData->VerticalResolution > ModeData2->VerticalResolution)
635	\|\| ( ModeData->HorizontalResolution == ModeData2->HorizontalResolution
636	&& ModeData->VerticalResolution == ModeData2->VerticalResolution
637	&& ModeData->ModeNumber > ModeData2->ModeNumber)) {
638	VBOX_VGA_MODE_DATA Tmp;
639	CopyMem(&Tmp, ModeData, sizeof(Tmp));
640	CopyMem(ModeData, ModeData2, sizeof(Tmp));
641	CopyMem(ModeData2, &Tmp, sizeof(Tmp));
642	DEBUG((DEBUG_INFO, "%a:%d swapped mode entries %d and %d\n", __FILE__, __LINE__, Index, Index2));
643	}
644	ModeData2++;
645	}
646	ModeData++;
647	}
648
649	// dump mode list for debugging purposes
650	ModeData = &Private->ModeData[0];
651	for (Index = 0; Index < ValidModeCount; Index ++) {
652	DEBUG((DEBUG_INFO, "%a:%d mode %d: %dx%d mode number %d\n", __FILE__, __LINE__, Index, ModeData->HorizontalResolution, ModeData->VerticalResolution, ModeData->ModeNumber));
653	ModeData++;
654	}
655
656	Private->MaxMode = ValidModeCount;
657
658	if (EdidOverrideDataBlock != NULL) {
659	FreePool (EdidOverrideDataBlock);
660	}
661
662	return EFI_SUCCESS;
663
664	Done:
665	if (EdidOverrideDataBlock != NULL) {
666	FreePool (EdidOverrideDataBlock);
667	}
668	if (Private->EdidDiscovered.Edid != NULL) {
669	FreePool (Private->EdidDiscovered.Edid);
670	}
671	if (Private->EdidDiscovered.Edid != NULL) {
672	FreePool (Private->EdidActive.Edid);
673	}
674
675	return EFI_DEVICE_ERROR;
676	}

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source: vbox/trunk/src/VBox/Devices/EFI/Firmware/VBoxPkg/VBoxVgaDxe/Edid.c

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