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1 /** @file
2
3 Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
4
5 SPDX-License-Identifier: BSD-2-Clause-Patent
6
7 **/
8
9 #ifndef _LEGACY_BIOS_INTERFACE_
10 #define _LEGACY_BIOS_INTERFACE_
11
12
13 #include <FrameworkDxe.h>
14 #include <IndustryStandard/Pci.h>
15 #include <IndustryStandard/SmBios.h>
16 #include <IndustryStandard/Acpi10.h>
17
18 #include <Guid/SmBios.h>
19 #include <Guid/Acpi.h>
20 #include <Guid/DxeServices.h>
21 #include <Guid/LegacyBios.h>
22 #include <Guid/StatusCodeDataTypeId.h>
23 #include <Guid/ImageAuthentication.h>
24
25 #include <Protocol/BlockIo.h>
26 #include <Protocol/LoadedImage.h>
27 #include <Protocol/PciIo.h>
28 #include <Protocol/Cpu.h>
29 #include <Protocol/Timer.h>
30 #include <Protocol/IsaIo.h>
31 #include <Protocol/LegacyRegion2.h>
32 #include <Protocol/SimpleTextIn.h>
33 #include <Protocol/LegacyInterrupt.h>
34 #include <Protocol/LegacyBios.h>
35 #include <Protocol/DiskInfo.h>
36 #include <Protocol/GenericMemoryTest.h>
37 #include <Protocol/LegacyBiosPlatform.h>
38 #include <Protocol/DevicePath.h>
39 #include <Protocol/Legacy8259.h>
40 #include <Protocol/PciRootBridgeIo.h>
41 #include <Protocol/SerialIo.h>
42 #include <Protocol/SuperIo.h>
43 #include <Protocol/IoMmu.h>
44
45 #include <Library/BaseLib.h>
46 #include <Library/DebugLib.h>
47 #include <Library/UefiLib.h>
48 #include <Library/BaseMemoryLib.h>
49 #include <Library/ReportStatusCodeLib.h>
50 #include <Library/UefiRuntimeServicesTableLib.h>
51 #include <Library/HobLib.h>
52 #include <Library/UefiDriverEntryPoint.h>
53 #include <Library/MemoryAllocationLib.h>
54 #include <Library/UefiBootServicesTableLib.h>
55 #include <Library/IoLib.h>
56 #include <Library/PcdLib.h>
57 #include <Library/DevicePathLib.h>
58 #include <Library/DxeServicesTableLib.h>
59 #include <Library/DebugAgentLib.h>
60
61 //
62 // BUGBUG: This entry maybe changed to PCD in future and wait for
63 // redesign of BDS library
64 //
65 #define MAX_BBS_ENTRIES 0x100
66
67 //
68 // Thunk Status Codes
69 // (These apply only to errors with the thunk and not to the code that was
70 // thunked to.)
71 //
72 #define THUNK_OK 0x00
73 #define THUNK_ERR_A20_UNSUP 0x01
74 #define THUNK_ERR_A20_FAILED 0x02
75
76 //
77 // Vector base definitions
78 //
79 //
80 // 8259 Hardware definitions
81 //
82 #define LEGACY_MODE_BASE_VECTOR_MASTER 0x08
83 #define LEGACY_MODE_BASE_VECTOR_SLAVE 0x70
84
85 //
86 // The original PC used INT8-F for master PIC. Since these mapped over
87 // processor exceptions TIANO moved the master PIC to INT68-6F.
88 //
89 // The vector base for slave PIC is set as 0x70 for PC-AT compatibility.
90 //
91 #define PROTECTED_MODE_BASE_VECTOR_MASTER 0x68
92 #define PROTECTED_MODE_BASE_VECTOR_SLAVE 0x70
93
94 //
95 // When we call CSM16 functions, some CSM16 use es:[offset + 0xabcd] to get data passed from CSM32,
96 // offset + 0xabcd could overflow which exceeds 0xFFFF which is invalid in real mode.
97 // So this will keep offset as small as possible to avoid offset overflow in real mode.
98 //
99 #define NORMALIZE_EFI_SEGMENT(_Adr) (UINT16) (((UINTN) (_Adr)) >> 4)
100 #define NORMALIZE_EFI_OFFSET(_Adr) (UINT16) (((UINT16) ((UINTN) (_Adr))) & 0xf)
101
102 //
103 // Trace defines
104 //
105 //
106 #define LEGACY_BDA_TRACE 0x000
107 #define LEGACY_BIOS_TRACE 0x040
108 #define LEGACY_BOOT_TRACE 0x080
109 #define LEGACY_CMOS_TRACE 0x0C0
110 #define LEGACY_IDE_TRACE 0x100
111 #define LEGACY_MP_TRACE 0x140
112 #define LEGACY_PCI_TRACE 0x180
113 #define LEGACY_SIO_TRACE 0x1C0
114
115 #define LEGACY_PCI_TRACE_000 LEGACY_PCI_TRACE + 0x00
116 #define LEGACY_PCI_TRACE_001 LEGACY_PCI_TRACE + 0x01
117 #define LEGACY_PCI_TRACE_002 LEGACY_PCI_TRACE + 0x02
118 #define LEGACY_PCI_TRACE_003 LEGACY_PCI_TRACE + 0x03
119 #define LEGACY_PCI_TRACE_004 LEGACY_PCI_TRACE + 0x04
120 #define LEGACY_PCI_TRACE_005 LEGACY_PCI_TRACE + 0x05
121 #define LEGACY_PCI_TRACE_006 LEGACY_PCI_TRACE + 0x06
122 #define LEGACY_PCI_TRACE_007 LEGACY_PCI_TRACE + 0x07
123 #define LEGACY_PCI_TRACE_008 LEGACY_PCI_TRACE + 0x08
124 #define LEGACY_PCI_TRACE_009 LEGACY_PCI_TRACE + 0x09
125 #define LEGACY_PCI_TRACE_00A LEGACY_PCI_TRACE + 0x0A
126 #define LEGACY_PCI_TRACE_00B LEGACY_PCI_TRACE + 0x0B
127 #define LEGACY_PCI_TRACE_00C LEGACY_PCI_TRACE + 0x0C
128 #define LEGACY_PCI_TRACE_00D LEGACY_PCI_TRACE + 0x0D
129 #define LEGACY_PCI_TRACE_00E LEGACY_PCI_TRACE + 0x0E
130 #define LEGACY_PCI_TRACE_00F LEGACY_PCI_TRACE + 0x0F
131
132 #define BDA_VIDEO_MODE 0x49
133
134 #define IDE_PI_REGISTER_PNE BIT0
135 #define IDE_PI_REGISTER_SNE BIT2
136
137 typedef struct {
138 UINTN PciSegment;
139 UINTN PciBus;
140 UINTN PciDevice;
141 UINTN PciFunction;
142 UINT32 ShadowAddress;
143 UINT32 ShadowedSize;
144 UINT8 DiskStart;
145 UINT8 DiskEnd;
146 } ROM_INSTANCE_ENTRY;
147
148 //
149 // Values for RealModeGdt
150 //
151 #if defined (MDE_CPU_IA32)
152
153 #define NUM_REAL_GDT_ENTRIES 3
154 #define CONVENTIONAL_MEMORY_TOP 0xA0000 // 640 KB
155 #define INITIAL_VALUE_BELOW_1K 0x0
156
157 #elif defined (MDE_CPU_X64)
158
159 #define NUM_REAL_GDT_ENTRIES 8
160 #define CONVENTIONAL_MEMORY_TOP 0xA0000 // 640 KB
161 #define INITIAL_VALUE_BELOW_1K 0x0
162
163 #endif
164
165 #pragma pack(1)
166
167 //
168 // Define what a processor GDT looks like
169 //
170 typedef struct {
171 UINT32 LimitLo : 16;
172 UINT32 BaseLo : 16;
173 UINT32 BaseMid : 8;
174 UINT32 Type : 4;
175 UINT32 System : 1;
176 UINT32 Dpl : 2;
177 UINT32 Present : 1;
178 UINT32 LimitHi : 4;
179 UINT32 Software : 1;
180 UINT32 Reserved : 1;
181 UINT32 DefaultSize : 1;
182 UINT32 Granularity : 1;
183 UINT32 BaseHi : 8;
184 } GDT32;
185
186 typedef struct {
187 UINT16 LimitLow;
188 UINT16 BaseLow;
189 UINT8 BaseMid;
190 UINT8 Attribute;
191 UINT8 LimitHi;
192 UINT8 BaseHi;
193 } GDT64;
194
195 //
196 // Define what a processor descriptor looks like
197 // This data structure must be kept in sync with ASM STRUCT in Thunk.inc
198 //
199 typedef struct {
200 UINT16 Limit;
201 UINT64 Base;
202 } DESCRIPTOR64;
203
204 typedef struct {
205 UINT16 Limit;
206 UINT32 Base;
207 } DESCRIPTOR32;
208
209 //
210 // Low stub lay out
211 //
212 #define LOW_STACK_SIZE (8 * 1024) // 8k?
213 #define EFI_MAX_E820_ENTRY 100
214 #define FIRST_INSTANCE 1
215 #define NOT_FIRST_INSTANCE 0
216
217 #if defined (MDE_CPU_IA32)
218 typedef struct {
219 //
220 // Space for the code
221 // The address of Code is also the beginning of the relocated Thunk code
222 //
223 CHAR8 Code[4096]; // ?
224 //
225 // The address of the Reverse Thunk code
226 // Note that this member CONTAINS the address of the relocated reverse thunk
227 // code unlike the member variable 'Code', which IS the address of the Thunk
228 // code.
229 //
230 UINT32 LowReverseThunkStart;
231
232 //
233 // Data for the code (cs releative)
234 //
235 DESCRIPTOR32 GdtDesc; // Protected mode GDT
236 DESCRIPTOR32 IdtDesc; // Protected mode IDT
237 UINT32 FlatSs;
238 UINT32 FlatEsp;
239
240 UINT32 LowCodeSelector; // Low code selector in GDT
241 UINT32 LowDataSelector; // Low data selector in GDT
242 UINT32 LowStack;
243 DESCRIPTOR32 RealModeIdtDesc;
244
245 //
246 // real-mode GDT (temporary GDT with two real mode segment descriptors)
247 //
248 GDT32 RealModeGdt[NUM_REAL_GDT_ENTRIES];
249 DESCRIPTOR32 RealModeGdtDesc;
250
251 //
252 // Members specifically for the reverse thunk
253 // The RevReal* members are used to store the current state of real mode
254 // before performing the reverse thunk. The RevFlat* members must be set
255 // before calling the reverse thunk assembly code.
256 //
257 UINT16 RevRealDs;
258 UINT16 RevRealSs;
259 UINT32 RevRealEsp;
260 DESCRIPTOR32 RevRealIdtDesc;
261 UINT16 RevFlatDataSelector; // Flat data selector in GDT
262 UINT32 RevFlatStack;
263
264 //
265 // A low memory stack
266 //
267 CHAR8 Stack[LOW_STACK_SIZE];
268
269 //
270 // Stack for flat mode after reverse thunk
271 // @bug - This may no longer be necessary if the reverse thunk interface
272 // is changed to have the flat stack in a different location.
273 //
274 CHAR8 RevThunkStack[LOW_STACK_SIZE];
275
276 //
277 // Legacy16 Init memory map info
278 //
279 EFI_TO_COMPATIBILITY16_INIT_TABLE EfiToLegacy16InitTable;
280
281 EFI_TO_COMPATIBILITY16_BOOT_TABLE EfiToLegacy16BootTable;
282
283 CHAR8 InterruptRedirectionCode[32];
284 EFI_LEGACY_INSTALL_PCI_HANDLER PciHandler;
285 EFI_DISPATCH_OPROM_TABLE DispatchOpromTable;
286 BBS_TABLE BbsTable[MAX_BBS_ENTRIES];
287 } LOW_MEMORY_THUNK;
288
289 #elif defined (MDE_CPU_X64)
290
291 typedef struct {
292 //
293 // Space for the code
294 // The address of Code is also the beginning of the relocated Thunk code
295 //
296 CHAR8 Code[4096]; // ?
297
298 //
299 // Data for the code (cs releative)
300 //
301 DESCRIPTOR64 X64GdtDesc; // Protected mode GDT
302 DESCRIPTOR64 X64IdtDesc; // Protected mode IDT
303 UINTN X64Ss;
304 UINTN X64Esp;
305
306 UINTN RealStack;
307 DESCRIPTOR32 RealModeIdtDesc;
308 DESCRIPTOR32 RealModeGdtDesc;
309
310 //
311 // real-mode GDT (temporary GDT with two real mode segment descriptors)
312 //
313 GDT64 RealModeGdt[NUM_REAL_GDT_ENTRIES];
314 UINT64 PageMapLevel4;
315
316 //
317 // A low memory stack
318 //
319 CHAR8 Stack[LOW_STACK_SIZE];
320
321 //
322 // Legacy16 Init memory map info
323 //
324 EFI_TO_COMPATIBILITY16_INIT_TABLE EfiToLegacy16InitTable;
325
326 EFI_TO_COMPATIBILITY16_BOOT_TABLE EfiToLegacy16BootTable;
327
328 CHAR8 InterruptRedirectionCode[32];
329 EFI_LEGACY_INSTALL_PCI_HANDLER PciHandler;
330 EFI_DISPATCH_OPROM_TABLE DispatchOpromTable;
331 BBS_TABLE BbsTable[MAX_BBS_ENTRIES];
332 } LOW_MEMORY_THUNK;
333
334 #endif
335
336 //
337 // PnP Expansion Header
338 //
339 typedef struct {
340 UINT32 PnpSignature;
341 UINT8 Revision;
342 UINT8 Length;
343 UINT16 NextHeader;
344 UINT8 Reserved1;
345 UINT8 Checksum;
346 UINT32 DeviceId;
347 UINT16 MfgPointer;
348 UINT16 ProductNamePointer;
349 UINT8 Class;
350 UINT8 SubClass;
351 UINT8 Interface;
352 UINT8 DeviceIndicators;
353 UINT16 Bcv;
354 UINT16 DisconnectVector;
355 UINT16 Bev;
356 UINT16 Reserved2;
357 UINT16 StaticResourceVector;
358 } LEGACY_PNP_EXPANSION_HEADER;
359
360 typedef struct {
361 UINT8 PciSegment;
362 UINT8 PciBus;
363 UINT8 PciDevice;
364 UINT8 PciFunction;
365 UINT16 Vid;
366 UINT16 Did;
367 UINT16 SysSid;
368 UINT16 SVid;
369 UINT8 Class;
370 UINT8 SubClass;
371 UINT8 Interface;
372 UINT8 Reserved;
373 UINTN RomStart;
374 UINTN ManufacturerString;
375 UINTN ProductNameString;
376 } LEGACY_ROM_AND_BBS_TABLE;
377
378 //
379 // Structure how EFI has mapped a devices HDD drive numbers.
380 // Boot to EFI aware OS or shell requires this mapping when
381 // 16-bit CSM assigns drive numbers.
382 // This mapping is ignored booting to a legacy OS.
383 //
384 typedef struct {
385 UINT8 PciSegment;
386 UINT8 PciBus;
387 UINT8 PciDevice;
388 UINT8 PciFunction;
389 UINT8 StartDriveNumber;
390 UINT8 EndDriveNumber;
391 } LEGACY_EFI_HDD_TABLE;
392
393 //
394 // This data is passed to Leacy16Boot
395 //
396 typedef enum {
397 EfiAcpiAddressRangeMemory = 1,
398 EfiAcpiAddressRangeReserved = 2,
399 EfiAcpiAddressRangeACPI = 3,
400 EfiAcpiAddressRangeNVS = 4,
401 EfiAddressRangePersistentMemory = 7
402 } EFI_ACPI_MEMORY_TYPE;
403
404 typedef struct {
405 UINT64 BaseAddr;
406 UINT64 Length;
407 EFI_ACPI_MEMORY_TYPE Type;
408 } EFI_E820_ENTRY64;
409
410 typedef struct {
411 UINT32 BassAddrLow;
412 UINT32 BaseAddrHigh;
413 UINT32 LengthLow;
414 UINT32 LengthHigh;
415 EFI_ACPI_MEMORY_TYPE Type;
416 } EFI_E820_ENTRY;
417
418 #pragma pack()
419
420 extern BBS_TABLE *mBbsTable;
421
422 extern EFI_GENERIC_MEMORY_TEST_PROTOCOL *gGenMemoryTest;
423
424 extern BOOLEAN mEndOfDxe;
425
426 #define PORT_70 0x70
427 #define PORT_71 0x71
428
429 #define CMOS_0A 0x0a ///< Status register A
430 #define CMOS_0D 0x0d ///< Status register D
431 #define CMOS_0E 0x0e ///< Diagnostic Status
432 #define CMOS_0F 0x0f ///< Shutdown status
433 #define CMOS_10 0x10 ///< Floppy type
434 #define CMOS_12 0x12 ///< IDE type
435 #define CMOS_14 0x14 ///< Same as BDA 40:10
436 #define CMOS_15 0x15 ///< Low byte of base memory in 1k increments
437 #define CMOS_16 0x16 ///< High byte of base memory in 1k increments
438 #define CMOS_17 0x17 ///< Low byte of 1MB+ memory in 1k increments - max 15 MB
439 #define CMOS_18 0x18 ///< High byte of 1MB+ memory in 1k increments - max 15 MB
440 #define CMOS_19 0x19 ///< C: extended drive type
441 #define CMOS_1A 0x1a ///< D: extended drive type
442 #define CMOS_2E 0x2e ///< Most significient byte of standard checksum
443 #define CMOS_2F 0x2f ///< Least significient byte of standard checksum
444 #define CMOS_30 0x30 ///< CMOS 0x17
445 #define CMOS_31 0x31 ///< CMOS 0x18
446 #define CMOS_32 0x32 ///< Century byte
447
448 //
449 // 8254 Timer registers
450 //
451 #define TIMER0_COUNT_PORT 0x40
452 #define TIMER1_COUNT_PORT 0x41
453 #define TIMER2_COUNT_PORT 0x42
454 #define TIMER_CONTROL_PORT 0x43
455
456 //
457 // Timer 0, Read/Write LSB then MSB, Square wave output, binary count use.
458 //
459 #define TIMER0_CONTROL_WORD 0x36
460
461 #define LEGACY_BIOS_INSTANCE_SIGNATURE SIGNATURE_32 ('L', 'B', 'I', 'T')
462 typedef struct {
463 UINTN Signature;
464
465 EFI_HANDLE Handle;
466 EFI_LEGACY_BIOS_PROTOCOL LegacyBios;
467
468 EFI_HANDLE ImageHandle;
469
470 //
471 // CPU Architectural Protocol
472 //
473 EFI_CPU_ARCH_PROTOCOL *Cpu;
474
475 //
476 // Timer Architectural Protocol
477 //
478 EFI_TIMER_ARCH_PROTOCOL *Timer;
479 BOOLEAN TimerUses8254;
480
481 //
482 // Protocol to Lock and Unlock 0xc0000 - 0xfffff
483 //
484 EFI_LEGACY_REGION2_PROTOCOL *LegacyRegion;
485
486 EFI_LEGACY_BIOS_PLATFORM_PROTOCOL *LegacyBiosPlatform;
487
488 //
489 // Interrupt control for thunk and PCI IRQ
490 //
491 EFI_LEGACY_8259_PROTOCOL *Legacy8259;
492
493 //
494 // PCI Interrupt PIRQ control
495 //
496 EFI_LEGACY_INTERRUPT_PROTOCOL *LegacyInterrupt;
497
498 //
499 // Generic Memory Test
500 //
501 EFI_GENERIC_MEMORY_TEST_PROTOCOL *GenericMemoryTest;
502
503 //
504 // TRUE if PCI Interrupt Line registers have been programmed.
505 //
506 BOOLEAN PciInterruptLine;
507
508 //
509 // Code space below 1MB needed by thunker to transition to real mode.
510 // Contains stack and real mode code fragments
511 //
512 LOW_MEMORY_THUNK *IntThunk;
513
514 //
515 // Starting shadow address of the Legacy BIOS
516 //
517 UINT32 BiosStart;
518 UINT32 LegacyBiosImageSize;
519
520 //
521 // Start of variables used by CsmItp.mac ITP macro file and/os LegacyBios
522 //
523 UINT8 Dump[4];
524
525 //
526 // $EFI Legacy16 code entry info in memory < 1 MB;
527 //
528 EFI_COMPATIBILITY16_TABLE *Legacy16Table;
529 VOID *Legacy16InitPtr;
530 VOID *Legacy16BootPtr;
531 VOID *InternalIrqRoutingTable;
532 UINT32 NumberIrqRoutingEntries;
533 VOID *BbsTablePtr;
534 VOID *HddTablePtr;
535 UINT32 NumberHddControllers;
536
537 //
538 // Cached copy of Legacy16 entry point
539 //
540 UINT16 Legacy16CallSegment;
541 UINT16 Legacy16CallOffset;
542
543 //
544 // Returned from $EFI and passed in to OPROMS
545 //
546 UINT16 PnPInstallationCheckSegment;
547 UINT16 PnPInstallationCheckOffset;
548
549 //
550 // E820 table
551 //
552 EFI_E820_ENTRY E820Table[EFI_MAX_E820_ENTRY];
553 UINT32 NumberE820Entries;
554
555 //
556 // True if legacy VGA INT 10h handler installed
557 //
558 BOOLEAN VgaInstalled;
559
560 //
561 // Number of IDE drives
562 //
563 UINT8 IdeDriveCount;
564
565 //
566 // Current Free Option ROM space. An option ROM must NOT go past
567 // BiosStart.
568 //
569 UINT32 OptionRom;
570
571 //
572 // Save Legacy16 unexpected interrupt vector. Reprogram INT 68-6F from
573 // EFI values to legacy value just before boot.
574 //
575 UINT32 BiosUnexpectedInt;
576 UINT32 ThunkSavedInt[8];
577 UINT16 ThunkSeg;
578 LEGACY_EFI_HDD_TABLE *LegacyEfiHddTable;
579 UINT16 LegacyEfiHddTableIndex;
580 UINT8 DiskEnd;
581 UINT8 Disk4075;
582 UINT16 TraceIndex;
583 UINT16 Trace[0x200];
584
585 //
586 // Indicate that whether GenericLegacyBoot is entered or not
587 //
588 BOOLEAN LegacyBootEntered;
589
590 //
591 // CSM16 PCI Interface Version
592 //
593 UINT16 Csm16PciInterfaceVersion;
594
595 } LEGACY_BIOS_INSTANCE;
596
597
598 #pragma pack(1)
599
600 /*
601 40:00-01 Com1
602 40:02-03 Com2
603 40:04-05 Com3
604 40:06-07 Com4
605 40:08-09 Lpt1
606 40:0A-0B Lpt2
607 40:0C-0D Lpt3
608 40:0E-0E Ebda segment
609 40:10-11 MachineConfig
610 40:12 Bda12 - skip
611 40:13-14 MemSize below 1MB
612 40:15-16 Bda15_16 - skip
613 40:17 Keyboard Shift status
614 40:18-19 Bda18_19 - skip
615 40:1A-1B Key buffer head
616 40:1C-1D Key buffer tail
617 40:1E-3D Bda1E_3D- key buffer -skip
618 40:3E-3F FloppyData 3E = Calibration status 3F = Motor status
619 40:40 FloppyTimeout
620 40:41-74 Bda41_74 - skip
621 40:75 Number of HDD drives
622 40:76-77 Bda76_77 - skip
623 40:78-79 78 = Lpt1 timeout, 79 = Lpt2 timeout
624 40:7A-7B 7A = Lpt3 timeout, 7B = Lpt4 timeout
625 40:7C-7D 7C = Com1 timeout, 7D = Com2 timeout
626 40:7E-7F 7E = Com3 timeout, 7F = Com4 timeout
627 40:80-81 Pointer to start of key buffer
628 40:82-83 Pointer to end of key buffer
629 40:84-87 Bda84_87 - skip
630 40:88 HDD Data Xmit rate
631 40:89-8f skip
632 40:90 Floppy data rate
633 40:91-95 skip
634 40:96 Keyboard Status
635 40:97 LED Status
636 40:98-101 skip
637 */
638 typedef struct {
639 UINT16 Com1;
640 UINT16 Com2;
641 UINT16 Com3;
642 UINT16 Com4;
643 UINT16 Lpt1;
644 UINT16 Lpt2;
645 UINT16 Lpt3;
646 UINT16 Ebda;
647 UINT16 MachineConfig;
648 UINT8 Bda12;
649 UINT16 MemSize;
650 UINT8 Bda15_16[0x02];
651 UINT8 ShiftStatus;
652 UINT8 Bda18_19[0x02];
653 UINT16 KeyHead;
654 UINT16 KeyTail;
655 UINT16 Bda1E_3D[0x10];
656 UINT16 FloppyData;
657 UINT8 FloppyTimeout;
658 UINT8 Bda41_74[0x34];
659 UINT8 NumberOfDrives;
660 UINT8 Bda76_77[0x02];
661 UINT16 Lpt1_2Timeout;
662 UINT16 Lpt3_4Timeout;
663 UINT16 Com1_2Timeout;
664 UINT16 Com3_4Timeout;
665 UINT16 KeyStart;
666 UINT16 KeyEnd;
667 UINT8 Bda84_87[0x4];
668 UINT8 DataXmit;
669 UINT8 Bda89_8F[0x07];
670 UINT8 FloppyXRate;
671 UINT8 Bda91_95[0x05];
672 UINT8 KeyboardStatus;
673 UINT8 LedStatus;
674 } BDA_STRUC;
675 #pragma pack()
676
677 #define LEGACY_BIOS_INSTANCE_FROM_THIS(this) CR (this, LEGACY_BIOS_INSTANCE, LegacyBios, LEGACY_BIOS_INSTANCE_SIGNATURE)
678
679 /**
680 Thunk to 16-bit real mode and execute a software interrupt with a vector
681 of BiosInt. Regs will contain the 16-bit register context on entry and
682 exit.
683
684 @param This Protocol instance pointer.
685 @param BiosInt Processor interrupt vector to invoke
686 @param Regs Register contexted passed into (and returned) from thunk to
687 16-bit mode
688
689 @retval FALSE Thunk completed, and there were no BIOS errors in the target code.
690 See Regs for status.
691 @retval TRUE There was a BIOS erro in the target code.
692
693 **/
694 BOOLEAN
695 EFIAPI
696 LegacyBiosInt86 (
697 IN EFI_LEGACY_BIOS_PROTOCOL *This,
698 IN UINT8 BiosInt,
699 IN EFI_IA32_REGISTER_SET *Regs
700 );
701
702
703 /**
704 Thunk to 16-bit real mode and call Segment:Offset. Regs will contain the
705 16-bit register context on entry and exit. Arguments can be passed on
706 the Stack argument
707
708 @param This Protocol instance pointer.
709 @param Segment Segment of 16-bit mode call
710 @param Offset Offset of 16-bit mdoe call
711 @param Regs Register contexted passed into (and returned) from
712 thunk to 16-bit mode
713 @param Stack Caller allocated stack used to pass arguments
714 @param StackSize Size of Stack in bytes
715
716 @retval FALSE Thunk completed, and there were no BIOS errors in
717 the target code. See Regs for status.
718 @retval TRUE There was a BIOS erro in the target code.
719
720 **/
721 BOOLEAN
722 EFIAPI
723 LegacyBiosFarCall86 (
724 IN EFI_LEGACY_BIOS_PROTOCOL *This,
725 IN UINT16 Segment,
726 IN UINT16 Offset,
727 IN EFI_IA32_REGISTER_SET *Regs,
728 IN VOID *Stack,
729 IN UINTN StackSize
730 );
731
732
733 /**
734 Test to see if a legacy PCI ROM exists for this device. Optionally return
735 the Legacy ROM instance for this PCI device.
736
737 @param This Protocol instance pointer.
738 @param PciHandle The PCI PC-AT OPROM from this devices ROM BAR will
739 be loaded
740 @param RomImage Return the legacy PCI ROM for this device
741 @param RomSize Size of ROM Image
742 @param Flags Indicates if ROM found and if PC-AT.
743
744 @retval EFI_SUCCESS Legacy Option ROM available for this device
745 @retval EFI_UNSUPPORTED Legacy Option ROM not supported.
746
747 **/
748 EFI_STATUS
749 EFIAPI
750 LegacyBiosCheckPciRom (
751 IN EFI_LEGACY_BIOS_PROTOCOL *This,
752 IN EFI_HANDLE PciHandle,
753 OUT VOID **RomImage OPTIONAL,
754 OUT UINTN *RomSize OPTIONAL,
755 OUT UINTN *Flags
756 );
757
758
759 /**
760 Assign drive number to legacy HDD drives prior to booting an EFI
761 aware OS so the OS can access drives without an EFI driver.
762 Note: BBS compliant drives ARE NOT available until this call by
763 either shell or EFI.
764
765 @param This Protocol instance pointer.
766 @param BbsCount Number of BBS_TABLE structures
767 @param BbsTable List BBS entries
768
769 @retval EFI_SUCCESS Drive numbers assigned
770
771 **/
772 EFI_STATUS
773 EFIAPI
774 LegacyBiosPrepareToBootEfi (
775 IN EFI_LEGACY_BIOS_PROTOCOL *This,
776 OUT UINT16 *BbsCount,
777 OUT BBS_TABLE **BbsTable
778 );
779
780
781 /**
782 To boot from an unconventional device like parties and/or execute
783 HDD diagnostics.
784
785 @param This Protocol instance pointer.
786 @param Attributes How to interpret the other input parameters
787 @param BbsEntry The 0-based index into the BbsTable for the parent
788 device.
789 @param BeerData Pointer to the 128 bytes of ram BEER data.
790 @param ServiceAreaData Pointer to the 64 bytes of raw Service Area data.
791 The caller must provide a pointer to the specific
792 Service Area and not the start all Service Areas.
793 EFI_INVALID_PARAMETER if error. Does NOT return if no error.
794
795 **/
796 EFI_STATUS
797 EFIAPI
798 LegacyBiosBootUnconventionalDevice (
799 IN EFI_LEGACY_BIOS_PROTOCOL *This,
800 IN UDC_ATTRIBUTES Attributes,
801 IN UINTN BbsEntry,
802 IN VOID *BeerData,
803 IN VOID *ServiceAreaData
804 );
805
806
807 /**
808 Load a legacy PC-AT OPROM on the PciHandle device. Return information
809 about how many disks were added by the OPROM and the shadow address and
810 size. DiskStart & DiskEnd are INT 13h drive letters. Thus 0x80 is C:
811
812 @param This Protocol instance pointer.
813 @param PciHandle The PCI PC-AT OPROM from this devices ROM BAR will
814 be loaded. This value is NULL if RomImage is
815 non-NULL. This is the normal case.
816 @param RomImage A PCI PC-AT ROM image. This argument is non-NULL
817 if there is no hardware associated with the ROM
818 and thus no PciHandle, otherwise is must be NULL.
819 Example is PXE base code.
820 @param Flags Indicates if ROM found and if PC-AT.
821 @param DiskStart Disk number of first device hooked by the ROM. If
822 DiskStart is the same as DiskEnd no disked were
823 hooked.
824 @param DiskEnd Disk number of the last device hooked by the ROM.
825 @param RomShadowAddress Shadow address of PC-AT ROM
826 @param RomShadowedSize Size of RomShadowAddress in bytes
827
828 @retval EFI_SUCCESS Legacy ROM loaded for this device
829 @retval EFI_INVALID_PARAMETER PciHandle not found
830 @retval EFI_UNSUPPORTED There is no PCI ROM in the ROM BAR or no onboard
831 ROM
832
833 **/
834 EFI_STATUS
835 EFIAPI
836 LegacyBiosInstallPciRom (
837 IN EFI_LEGACY_BIOS_PROTOCOL * This,
838 IN EFI_HANDLE PciHandle,
839 IN VOID **RomImage,
840 OUT UINTN *Flags,
841 OUT UINT8 *DiskStart OPTIONAL,
842 OUT UINT8 *DiskEnd OPTIONAL,
843 OUT VOID **RomShadowAddress OPTIONAL,
844 OUT UINT32 *RomShadowedSize OPTIONAL
845 );
846
847
848 /**
849 Fill in the standard BDA for Keyboard LEDs
850
851 @param This Protocol instance pointer.
852 @param Leds Current LED status
853
854 @retval EFI_SUCCESS It should always work.
855
856 **/
857 EFI_STATUS
858 EFIAPI
859 LegacyBiosUpdateKeyboardLedStatus (
860 IN EFI_LEGACY_BIOS_PROTOCOL *This,
861 IN UINT8 Leds
862 );
863
864
865 /**
866 Get all BBS info
867
868 @param This Protocol instance pointer.
869 @param HddCount Number of HDD_INFO structures
870 @param HddInfo Onboard IDE controller information
871 @param BbsCount Number of BBS_TABLE structures
872 @param BbsTable List BBS entries
873
874 @retval EFI_SUCCESS Tables returned
875 @retval EFI_NOT_FOUND resource not found
876 @retval EFI_DEVICE_ERROR can not get BBS table
877
878 **/
879 EFI_STATUS
880 EFIAPI
881 LegacyBiosGetBbsInfo (
882 IN EFI_LEGACY_BIOS_PROTOCOL *This,
883 OUT UINT16 *HddCount,
884 OUT HDD_INFO **HddInfo,
885 OUT UINT16 *BbsCount,
886 OUT BBS_TABLE **BbsTable
887 );
888
889
890 /**
891 Shadow all legacy16 OPROMs that haven't been shadowed.
892 Warning: Use this with caution. This routine disconnects all EFI
893 drivers. If used externally then caller must re-connect EFI
894 drivers.
895
896 @param This Protocol instance pointer.
897
898 @retval EFI_SUCCESS OPROMs shadowed
899
900 **/
901 EFI_STATUS
902 EFIAPI
903 LegacyBiosShadowAllLegacyOproms (
904 IN EFI_LEGACY_BIOS_PROTOCOL *This
905 );
906
907
908 /**
909 Attempt to legacy boot the BootOption. If the EFI contexted has been
910 compromised this function will not return.
911
912 @param This Protocol instance pointer.
913 @param BbsDevicePath EFI Device Path from BootXXXX variable.
914 @param LoadOptionsSize Size of LoadOption in size.
915 @param LoadOptions LoadOption from BootXXXX variable
916
917 @retval EFI_SUCCESS Removable media not present
918
919 **/
920 EFI_STATUS
921 EFIAPI
922 LegacyBiosLegacyBoot (
923 IN EFI_LEGACY_BIOS_PROTOCOL *This,
924 IN BBS_BBS_DEVICE_PATH *BbsDevicePath,
925 IN UINT32 LoadOptionsSize,
926 IN VOID *LoadOptions
927 );
928
929
930 /**
931 Allocate memory < 1 MB and copy the thunker code into low memory. Se up
932 all the descriptors.
933
934 @param Private Private context for Legacy BIOS
935
936 @retval EFI_SUCCESS Should only pass.
937
938 **/
939 EFI_STATUS
940 LegacyBiosInitializeThunk (
941 IN LEGACY_BIOS_INSTANCE *Private
942 );
943
944
945 /**
946 Fill in the standard BDA and EBDA stuff before Legacy16 load
947
948 @param Private Legacy BIOS Instance data
949
950 @retval EFI_SUCCESS It should always work.
951
952 **/
953 EFI_STATUS
954 LegacyBiosInitBda (
955 IN LEGACY_BIOS_INSTANCE *Private
956 );
957
958
959 /**
960 Collect IDE Inquiry data from the IDE disks
961
962 @param Private Legacy BIOS Instance data
963 @param HddInfo Hdd Information
964 @param Flag Reconnect IdeController or not
965
966 @retval EFI_SUCCESS It should always work.
967
968 **/
969 EFI_STATUS
970 LegacyBiosBuildIdeData (
971 IN LEGACY_BIOS_INSTANCE *Private,
972 IN HDD_INFO **HddInfo,
973 IN UINT16 Flag
974 );
975
976
977 /**
978 Enable ide controller. This gets disabled when LegacyBoot.c is about
979 to run the Option ROMs.
980
981 @param Private Legacy BIOS Instance data
982
983
984 **/
985 VOID
986 EnableIdeController (
987 IN LEGACY_BIOS_INSTANCE *Private
988 );
989
990
991 /**
992 If the IDE channel is in compatibility (legacy) mode, remove all
993 PCI I/O BAR addresses from the controller.
994
995 @param IdeController The handle of target IDE controller
996
997
998 **/
999 VOID
1000 InitLegacyIdeController (
1001 IN EFI_HANDLE IdeController
1002 );
1003
1004
1005 /**
1006 Program the interrupt routing register in all the PCI devices. On a PC AT system
1007 this register contains the 8259 IRQ vector that matches its PCI interrupt.
1008
1009 @param Private Legacy BIOS Instance data
1010
1011 @retval EFI_SUCCESS Succeed.
1012 @retval EFI_ALREADY_STARTED All PCI devices have been processed.
1013
1014 **/
1015 EFI_STATUS
1016 PciProgramAllInterruptLineRegisters (
1017 IN LEGACY_BIOS_INSTANCE *Private
1018 );
1019
1020
1021 /**
1022 Collect EFI Info about legacy devices.
1023
1024 @param Private Legacy BIOS Instance data
1025
1026 @retval EFI_SUCCESS It should always work.
1027
1028 **/
1029 EFI_STATUS
1030 LegacyBiosBuildSioData (
1031 IN LEGACY_BIOS_INSTANCE *Private
1032 );
1033
1034
1035 /**
1036 Shadow all the PCI legacy ROMs. Use data from the Legacy BIOS Protocol
1037 to chose the order. Skip any devices that have already have legacy
1038 BIOS run.
1039
1040 @param Private Protocol instance pointer.
1041
1042 @retval EFI_SUCCESS Succeed.
1043 @retval EFI_UNSUPPORTED Cannot get VGA device handle.
1044
1045 **/
1046 EFI_STATUS
1047 PciShadowRoms (
1048 IN LEGACY_BIOS_INSTANCE *Private
1049 );
1050
1051
1052 /**
1053 Fill in the standard BDA and EBDA stuff prior to legacy Boot
1054
1055 @param Private Legacy BIOS Instance data
1056
1057 @retval EFI_SUCCESS It should always work.
1058
1059 **/
1060 EFI_STATUS
1061 LegacyBiosCompleteBdaBeforeBoot (
1062 IN LEGACY_BIOS_INSTANCE *Private
1063 );
1064
1065
1066 /**
1067 Fill in the standard CMOS stuff before Legacy16 load
1068
1069 @param Private Legacy BIOS Instance data
1070
1071 @retval EFI_SUCCESS It should always work.
1072
1073 **/
1074 EFI_STATUS
1075 LegacyBiosInitCmos (
1076 IN LEGACY_BIOS_INSTANCE *Private
1077 );
1078
1079
1080 /**
1081 Fill in the standard CMOS stuff prior to legacy Boot
1082
1083 @param Private Legacy BIOS Instance data
1084
1085 @retval EFI_SUCCESS It should always work.
1086
1087 **/
1088 EFI_STATUS
1089 LegacyBiosCompleteStandardCmosBeforeBoot (
1090 IN LEGACY_BIOS_INSTANCE *Private
1091 );
1092
1093
1094 /**
1095 Contains the code that is copied into low memory (below 640K).
1096 This code reflects interrupts 0x68-0x6f to interrupts 0x08-0x0f.
1097 This template must be copied into low memory, and the IDT entries
1098 0x68-0x6F must be point to the low memory copy of this code. Each
1099 entry is 4 bytes long, so IDT entries 0x68-0x6F can be easily
1100 computed.
1101
1102 **/
1103 VOID
1104 InterruptRedirectionTemplate (
1105 VOID
1106 );
1107
1108
1109 /**
1110 Build the E820 table.
1111
1112 @param Private Legacy BIOS Instance data
1113 @param Size Size of E820 Table
1114
1115 @retval EFI_SUCCESS It should always work.
1116
1117 **/
1118 EFI_STATUS
1119 LegacyBiosBuildE820 (
1120 IN LEGACY_BIOS_INSTANCE *Private,
1121 OUT UINTN *Size
1122 );
1123
1124 /**
1125 This function is to put all AP in halt state.
1126
1127 @param Private Legacy BIOS Instance data
1128
1129 **/
1130 VOID
1131 ShutdownAPs (
1132 IN LEGACY_BIOS_INSTANCE *Private
1133 );
1134
1135 /**
1136 Worker function for LegacyBiosGetFlatDescs, retrieving content of
1137 specific registers.
1138
1139 @param IntThunk Pointer to IntThunk of Legacy BIOS context.
1140
1141 **/
1142 VOID
1143 GetRegisters (
1144 LOW_MEMORY_THUNK *IntThunk
1145 );
1146
1147 /**
1148 Routine for calling real thunk code.
1149
1150 @param RealCode The address of thunk code.
1151 @param BiosInt The Bios interrupt vector number.
1152 @param CallAddress The address of 16-bit mode call.
1153
1154 @return Status returned by real thunk code
1155
1156 **/
1157 UINTN
1158 CallRealThunkCode (
1159 UINT8 *RealCode,
1160 UINT8 BiosInt,
1161 UINT32 CallAddress
1162 );
1163
1164 /**
1165 Routine for generating soft interrupt.
1166
1167 @param Vector The interrupt vector number.
1168
1169 **/
1170 VOID
1171 GenerateSoftInit (
1172 UINT8 Vector
1173 );
1174
1175 /**
1176 Allocate memory for legacy usage.
1177
1178 @param AllocateType The type of allocation to perform.
1179 @param MemoryType The type of memory to allocate.
1180 @param StartPageAddress Start address of range
1181 @param Pages Number of pages to allocate
1182 @param Result Result of allocation
1183
1184 @retval EFI_SUCCESS Legacy16 code loaded
1185 @retval Other No protocol installed, unload driver.
1186
1187 **/
1188 EFI_STATUS
1189 AllocateLegacyMemory (
1190 IN EFI_ALLOCATE_TYPE AllocateType,
1191 IN EFI_MEMORY_TYPE MemoryType,
1192 IN EFI_PHYSICAL_ADDRESS StartPageAddress,
1193 IN UINTN Pages,
1194 OUT EFI_PHYSICAL_ADDRESS *Result
1195 );
1196
1197 /**
1198 Get a region from the LegacyBios for Tiano usage. Can only be invoked once.
1199
1200 @param This Protocol instance pointer.
1201 @param LegacyMemorySize Size of required region
1202 @param Region Region to use. 00 = Either 0xE0000 or 0xF0000
1203 block Bit0 = 1 0xF0000 block Bit1 = 1 0xE0000
1204 block
1205 @param Alignment Address alignment. Bit mapped. First non-zero
1206 bit from right is alignment.
1207 @param LegacyMemoryAddress Region Assigned
1208
1209 @retval EFI_SUCCESS Region assigned
1210 @retval EFI_ACCESS_DENIED Procedure previously invoked
1211 @retval Other Region not assigned
1212
1213 **/
1214 EFI_STATUS
1215 EFIAPI
1216 LegacyBiosGetLegacyRegion (
1217 IN EFI_LEGACY_BIOS_PROTOCOL *This,
1218 IN UINTN LegacyMemorySize,
1219 IN UINTN Region,
1220 IN UINTN Alignment,
1221 OUT VOID **LegacyMemoryAddress
1222 );
1223
1224 /**
1225 Get a region from the LegacyBios for Tiano usage. Can only be invoked once.
1226
1227 @param This Protocol instance pointer.
1228 @param LegacyMemorySize Size of data to copy
1229 @param LegacyMemoryAddress Legacy Region destination address Note: must
1230 be in region assigned by
1231 LegacyBiosGetLegacyRegion
1232 @param LegacyMemorySourceAddress Source of data
1233
1234 @retval EFI_SUCCESS Region assigned
1235 @retval EFI_ACCESS_DENIED Destination outside assigned region
1236
1237 **/
1238 EFI_STATUS
1239 EFIAPI
1240 LegacyBiosCopyLegacyRegion (
1241 IN EFI_LEGACY_BIOS_PROTOCOL *This,
1242 IN UINTN LegacyMemorySize,
1243 IN VOID *LegacyMemoryAddress,
1244 IN VOID *LegacyMemorySourceAddress
1245 );
1246
1247 /**
1248 Find Legacy16 BIOS image in the FLASH device and shadow it into memory. Find
1249 the $EFI table in the shadow area. Thunk into the Legacy16 code after it had
1250 been shadowed.
1251
1252 @param Private Legacy BIOS context data
1253
1254 @retval EFI_SUCCESS Legacy16 code loaded
1255 @retval Other No protocol installed, unload driver.
1256
1257 **/
1258 EFI_STATUS
1259 ShadowAndStartLegacy16 (
1260 IN LEGACY_BIOS_INSTANCE *Private
1261 );
1262
1263 /**
1264 Checks the state of the floppy and if media is inserted.
1265
1266 This routine checks the state of the floppy and if media is inserted.
1267 There are 3 cases:
1268 No floppy present - Set BBS entry to ignore
1269 Floppy present & no media - Set BBS entry to lowest priority. We cannot
1270 set it to ignore since 16-bit CSM will
1271 indicate no floppy and thus drive A: is
1272 unusable. CSM-16 will not try floppy since
1273 lowest priority and thus not incur boot
1274 time penality.
1275 Floppy present & media - Set BBS entry to some priority.
1276
1277 @return State of floppy media
1278
1279 **/
1280 UINT8
1281 HasMediaInFloppy (
1282 VOID
1283 );
1284
1285 /**
1286 Identify drive data must be updated to actual parameters before boot.
1287 This requires updating the checksum, if it exists.
1288
1289 @param IdentifyDriveData ATA Identify Data
1290 @param Checksum checksum of the ATA Identify Data
1291
1292 @retval EFI_SUCCESS checksum calculated
1293 @retval EFI_SECURITY_VIOLATION IdentifyData invalid
1294
1295 **/
1296 EFI_STATUS
1297 CalculateIdentifyDriveChecksum (
1298 IN UINT8 *IdentifyDriveData,
1299 OUT UINT8 *Checksum
1300 );
1301
1302 /**
1303 Identify drive data must be updated to actual parameters before boot.
1304
1305 @param IdentifyDriveData ATA Identify Data
1306
1307 **/
1308 VOID
1309 UpdateIdentifyDriveData (
1310 IN UINT8 *IdentifyDriveData
1311 );
1312
1313 /**
1314 Complete build of BBS TABLE.
1315
1316 @param Private Legacy BIOS Instance data
1317 @param BbsTable BBS Table passed to 16-bit code
1318
1319 @retval EFI_SUCCESS Removable media not present
1320
1321 **/
1322 EFI_STATUS
1323 LegacyBiosBuildBbs (
1324 IN LEGACY_BIOS_INSTANCE *Private,
1325 IN BBS_TABLE *BbsTable
1326 );
1327
1328 /**
1329 Read CMOS register through index/data port.
1330
1331 @param[in] Index The index of the CMOS register to read.
1332
1333 @return The data value from the CMOS register specified by Index.
1334
1335 **/
1336 UINT8
1337 LegacyReadStandardCmos (
1338 IN UINT8 Index
1339 );
1340
1341 /**
1342 Write CMOS register through index/data port.
1343
1344 @param[in] Index The index of the CMOS register to write.
1345 @param[in] Value The value of CMOS register to write.
1346
1347 @return The value written to the CMOS register specified by Index.
1348
1349 **/
1350 UINT8
1351 LegacyWriteStandardCmos (
1352 IN UINT8 Index,
1353 IN UINT8 Value
1354 );
1355
1356 /**
1357 Calculate the new standard CMOS checksum and write it.
1358
1359 @param Private Legacy BIOS Instance data
1360
1361 @retval EFI_SUCCESS Calculate 16-bit checksum successfully
1362
1363 **/
1364 EFI_STATUS
1365 LegacyCalculateWriteStandardCmosChecksum (
1366 VOID
1367 );
1368
1369 /**
1370 Test to see if a legacy PCI ROM exists for this device. Optionally return
1371 the Legacy ROM instance for this PCI device.
1372
1373 @param[in] This Protocol instance pointer.
1374 @param[in] PciHandle The PCI PC-AT OPROM from this devices ROM BAR will be loaded
1375 @param[out] RomImage Return the legacy PCI ROM for this device
1376 @param[out] RomSize Size of ROM Image
1377 @param[out] RuntimeImageLength Runtime size of ROM Image
1378 @param[out] Flags Indicates if ROM found and if PC-AT.
1379 @param[out] OpromRevision Revision of the PCI Rom
1380 @param[out] ConfigUtilityCodeHeaderPointer of Configuration Utility Code Header
1381
1382 @return EFI_SUCCESS Legacy Option ROM available for this device
1383 @return EFI_ALREADY_STARTED This device is already managed by its Oprom
1384 @return EFI_UNSUPPORTED Legacy Option ROM not supported.
1385
1386 **/
1387 EFI_STATUS
1388 LegacyBiosCheckPciRomEx (
1389 IN EFI_LEGACY_BIOS_PROTOCOL *This,
1390 IN EFI_HANDLE PciHandle,
1391 OUT VOID **RomImage OPTIONAL,
1392 OUT UINTN *RomSize OPTIONAL,
1393 OUT UINTN *RuntimeImageLength OPTIONAL,
1394 OUT UINTN *Flags OPTIONAL,
1395 OUT UINT8 *OpromRevision OPTIONAL,
1396 OUT VOID **ConfigUtilityCodeHeader OPTIONAL
1397 );
1398
1399 /**
1400 Relocate this image under 4G memory for IPF.
1401
1402 @param ImageHandle Handle of driver image.
1403 @param SystemTable Pointer to system table.
1404
1405 @retval EFI_SUCCESS Image successfully relocated.
1406 @retval EFI_ABORTED Failed to relocate image.
1407
1408 **/
1409 EFI_STATUS
1410 RelocateImageUnder4GIfNeeded (
1411 IN EFI_HANDLE ImageHandle,
1412 IN EFI_SYSTEM_TABLE *SystemTable
1413 );
1414
1415 /**
1416 Thunk to 16-bit real mode and call Segment:Offset. Regs will contain the
1417 16-bit register context on entry and exit. Arguments can be passed on
1418 the Stack argument
1419
1420 @param This Protocol instance pointer.
1421 @param Segment Segment of 16-bit mode call
1422 @param Offset Offset of 16-bit mdoe call
1423 @param Regs Register contexted passed into (and returned) from thunk to
1424 16-bit mode
1425 @param Stack Caller allocated stack used to pass arguments
1426 @param StackSize Size of Stack in bytes
1427
1428 @retval FALSE Thunk completed, and there were no BIOS errors in the target code.
1429 See Regs for status.
1430 @retval TRUE There was a BIOS erro in the target code.
1431
1432 **/
1433 BOOLEAN
1434 EFIAPI
1435 InternalLegacyBiosFarCall (
1436 IN EFI_LEGACY_BIOS_PROTOCOL *This,
1437 IN UINT16 Segment,
1438 IN UINT16 Offset,
1439 IN EFI_IA32_REGISTER_SET *Regs,
1440 IN VOID *Stack,
1441 IN UINTN StackSize
1442 );
1443
1444 /**
1445 Load a legacy PC-AT OpROM for VGA controller.
1446
1447 @param Private Driver private data.
1448
1449 @retval EFI_SUCCESS Legacy ROM successfully installed for this device.
1450 @retval EFI_DEVICE_ERROR No VGA device handle found, or native EFI video
1451 driver cannot be successfully disconnected, or VGA
1452 thunk driver cannot be successfully connected.
1453
1454 **/
1455 EFI_STATUS
1456 LegacyBiosInstallVgaRom (
1457 IN LEGACY_BIOS_INSTANCE *Private
1458 );
1459
1460 #endif
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