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1 /** @file
2
3 Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>
4
5 This program and the accompanying materials
6 are licensed and made available under the terms and conditions
7 of the BSD License which accompanies this distribution. The
8 full text of the license may be found at
9 http://opensource.org/licenses/bsd-license.php
10
11 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
12 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
13
14 **/
15
16 #ifndef _LEGACY_BIOS_INTERFACE_
17 #define _LEGACY_BIOS_INTERFACE_
18
19
20 #include <FrameworkDxe.h>
21 #include <IndustryStandard/Pci.h>
22 #include <IndustryStandard/SmBios.h>
23 #include <IndustryStandard/Acpi10.h>
24
25 #include <Guid/SmBios.h>
26 #include <Guid/Acpi.h>
27 #include <Guid/DxeServices.h>
28 #include <Guid/LegacyBios.h>
29 #include <Guid/StatusCodeDataTypeId.h>
30 #include <Guid/ImageAuthentication.h>
31
32 #include <Protocol/BlockIo.h>
33 #include <Protocol/LoadedImage.h>
34 #include <Protocol/PciIo.h>
35 #include <Protocol/Cpu.h>
36 #include <Protocol/Timer.h>
37 #include <Protocol/IsaIo.h>
38 #include <Protocol/LegacyRegion2.h>
39 #include <Protocol/SimpleTextIn.h>
40 #include <Protocol/LegacyInterrupt.h>
41 #include <Protocol/LegacyBios.h>
42 #include <Protocol/DiskInfo.h>
43 #include <Protocol/GenericMemoryTest.h>
44 #include <Protocol/LegacyBiosPlatform.h>
45 #include <Protocol/DevicePath.h>
46 #include <Protocol/Legacy8259.h>
47 #include <Protocol/PciRootBridgeIo.h>
48 #include <Protocol/SerialIo.h>
49 #include <Protocol/SuperIo.h>
50
51 #include <Library/BaseLib.h>
52 #include <Library/DebugLib.h>
53 #include <Library/UefiLib.h>
54 #include <Library/BaseMemoryLib.h>
55 #include <Library/ReportStatusCodeLib.h>
56 #include <Library/UefiRuntimeServicesTableLib.h>
57 #include <Library/HobLib.h>
58 #include <Library/UefiDriverEntryPoint.h>
59 #include <Library/MemoryAllocationLib.h>
60 #include <Library/UefiBootServicesTableLib.h>
61 #include <Library/IoLib.h>
62 #include <Library/PcdLib.h>
63 #include <Library/DevicePathLib.h>
64 #include <Library/DxeServicesTableLib.h>
65 #include <Library/PeCoffLib.h>
66 #include <Library/CacheMaintenanceLib.h>
67 #include <Library/DebugAgentLib.h>
68
69 //
70 // BUGBUG: This entry maybe changed to PCD in future and wait for
71 // redesign of BDS library
72 //
73 #define MAX_BBS_ENTRIES 0x100
74
75 //
76 // Thunk Status Codes
77 // (These apply only to errors with the thunk and not to the code that was
78 // thunked to.)
79 //
80 #define THUNK_OK 0x00
81 #define THUNK_ERR_A20_UNSUP 0x01
82 #define THUNK_ERR_A20_FAILED 0x02
83
84 //
85 // Vector base definitions
86 //
87 //
88 // 8259 Hardware definitions
89 //
90 #define LEGACY_MODE_BASE_VECTOR_MASTER 0x08
91 #define LEGACY_MODE_BASE_VECTOR_SLAVE 0x70
92
93 //
94 // The original PC used INT8-F for master PIC. Since these mapped over
95 // processor exceptions TIANO moved the master PIC to INT68-6F.
96 //
97 // The vector base for slave PIC is set as 0x70 for PC-AT compatibility.
98 //
99 #define PROTECTED_MODE_BASE_VECTOR_MASTER 0x68
100 #define PROTECTED_MODE_BASE_VECTOR_SLAVE 0x70
101
102 //
103 // When we call CSM16 functions, some CSM16 use es:[offset + 0xabcd] to get data passed from CSM32,
104 // offset + 0xabcd could overflow which exceeds 0xFFFF which is invalid in real mode.
105 // So this will keep offset as small as possible to avoid offset overflow in real mode.
106 //
107 #define NORMALIZE_EFI_SEGMENT(_Adr) (UINT16) (((UINTN) (_Adr)) >> 4)
108 #define NORMALIZE_EFI_OFFSET(_Adr) (UINT16) (((UINT16) ((UINTN) (_Adr))) & 0xf)
109
110 //
111 // Trace defines
112 //
113 //
114 #define LEGACY_BDA_TRACE 0x000
115 #define LEGACY_BIOS_TRACE 0x040
116 #define LEGACY_BOOT_TRACE 0x080
117 #define LEGACY_CMOS_TRACE 0x0C0
118 #define LEGACY_IDE_TRACE 0x100
119 #define LEGACY_MP_TRACE 0x140
120 #define LEGACY_PCI_TRACE 0x180
121 #define LEGACY_SIO_TRACE 0x1C0
122
123 #define LEGACY_PCI_TRACE_000 LEGACY_PCI_TRACE + 0x00
124 #define LEGACY_PCI_TRACE_001 LEGACY_PCI_TRACE + 0x01
125 #define LEGACY_PCI_TRACE_002 LEGACY_PCI_TRACE + 0x02
126 #define LEGACY_PCI_TRACE_003 LEGACY_PCI_TRACE + 0x03
127 #define LEGACY_PCI_TRACE_004 LEGACY_PCI_TRACE + 0x04
128 #define LEGACY_PCI_TRACE_005 LEGACY_PCI_TRACE + 0x05
129 #define LEGACY_PCI_TRACE_006 LEGACY_PCI_TRACE + 0x06
130 #define LEGACY_PCI_TRACE_007 LEGACY_PCI_TRACE + 0x07
131 #define LEGACY_PCI_TRACE_008 LEGACY_PCI_TRACE + 0x08
132 #define LEGACY_PCI_TRACE_009 LEGACY_PCI_TRACE + 0x09
133 #define LEGACY_PCI_TRACE_00A LEGACY_PCI_TRACE + 0x0A
134 #define LEGACY_PCI_TRACE_00B LEGACY_PCI_TRACE + 0x0B
135 #define LEGACY_PCI_TRACE_00C LEGACY_PCI_TRACE + 0x0C
136 #define LEGACY_PCI_TRACE_00D LEGACY_PCI_TRACE + 0x0D
137 #define LEGACY_PCI_TRACE_00E LEGACY_PCI_TRACE + 0x0E
138 #define LEGACY_PCI_TRACE_00F LEGACY_PCI_TRACE + 0x0F
139
140 #define BDA_VIDEO_MODE 0x49
141
142 #define IDE_PI_REGISTER_PNE BIT0
143 #define IDE_PI_REGISTER_SNE BIT2
144
145 typedef struct {
146 UINTN PciSegment;
147 UINTN PciBus;
148 UINTN PciDevice;
149 UINTN PciFunction;
150 UINT32 ShadowAddress;
151 UINT32 ShadowedSize;
152 UINT8 DiskStart;
153 UINT8 DiskEnd;
154 } ROM_INSTANCE_ENTRY;
155
156 //
157 // Values for RealModeGdt
158 //
159 #if defined (MDE_CPU_IA32)
160
161 #define NUM_REAL_GDT_ENTRIES 3
162 #define CONVENTIONAL_MEMORY_TOP 0xA0000 // 640 KB
163 #define INITIAL_VALUE_BELOW_1K 0x0
164
165 #elif defined (MDE_CPU_X64)
166
167 #define NUM_REAL_GDT_ENTRIES 8
168 #define CONVENTIONAL_MEMORY_TOP 0xA0000 // 640 KB
169 #define INITIAL_VALUE_BELOW_1K 0x0
170
171 #elif defined (MDE_CPU_IPF)
172
173 #define NUM_REAL_GDT_ENTRIES 3
174 #define CONVENTIONAL_MEMORY_TOP 0x80000 // 512 KB
175 #define INITIAL_VALUE_BELOW_1K 0xff
176
177 #endif
178
179 #pragma pack(1)
180
181 //
182 // Define what a processor GDT looks like
183 //
184 typedef struct {
185 UINT32 LimitLo : 16;
186 UINT32 BaseLo : 16;
187 UINT32 BaseMid : 8;
188 UINT32 Type : 4;
189 UINT32 System : 1;
190 UINT32 Dpl : 2;
191 UINT32 Present : 1;
192 UINT32 LimitHi : 4;
193 UINT32 Software : 1;
194 UINT32 Reserved : 1;
195 UINT32 DefaultSize : 1;
196 UINT32 Granularity : 1;
197 UINT32 BaseHi : 8;
198 } GDT32;
199
200 typedef struct {
201 UINT16 LimitLow;
202 UINT16 BaseLow;
203 UINT8 BaseMid;
204 UINT8 Attribute;
205 UINT8 LimitHi;
206 UINT8 BaseHi;
207 } GDT64;
208
209 //
210 // Define what a processor descriptor looks like
211 // This data structure must be kept in sync with ASM STRUCT in Thunk.inc
212 //
213 typedef struct {
214 UINT16 Limit;
215 UINT64 Base;
216 } DESCRIPTOR64;
217
218 typedef struct {
219 UINT16 Limit;
220 UINT32 Base;
221 } DESCRIPTOR32;
222
223 //
224 // Low stub lay out
225 //
226 #define LOW_STACK_SIZE (8 * 1024) // 8k?
227 #define EFI_MAX_E820_ENTRY 100
228 #define FIRST_INSTANCE 1
229 #define NOT_FIRST_INSTANCE 0
230
231 #if defined (MDE_CPU_IA32)
232 typedef struct {
233 //
234 // Space for the code
235 // The address of Code is also the beginning of the relocated Thunk code
236 //
237 CHAR8 Code[4096]; // ?
238 //
239 // The address of the Reverse Thunk code
240 // Note that this member CONTAINS the address of the relocated reverse thunk
241 // code unlike the member variable 'Code', which IS the address of the Thunk
242 // code.
243 //
244 UINT32 LowReverseThunkStart;
245
246 //
247 // Data for the code (cs releative)
248 //
249 DESCRIPTOR32 GdtDesc; // Protected mode GDT
250 DESCRIPTOR32 IdtDesc; // Protected mode IDT
251 UINT32 FlatSs;
252 UINT32 FlatEsp;
253
254 UINT32 LowCodeSelector; // Low code selector in GDT
255 UINT32 LowDataSelector; // Low data selector in GDT
256 UINT32 LowStack;
257 DESCRIPTOR32 RealModeIdtDesc;
258
259 //
260 // real-mode GDT (temporary GDT with two real mode segment descriptors)
261 //
262 GDT32 RealModeGdt[NUM_REAL_GDT_ENTRIES];
263 DESCRIPTOR32 RealModeGdtDesc;
264
265 //
266 // Members specifically for the reverse thunk
267 // The RevReal* members are used to store the current state of real mode
268 // before performing the reverse thunk. The RevFlat* members must be set
269 // before calling the reverse thunk assembly code.
270 //
271 UINT16 RevRealDs;
272 UINT16 RevRealSs;
273 UINT32 RevRealEsp;
274 DESCRIPTOR32 RevRealIdtDesc;
275 UINT16 RevFlatDataSelector; // Flat data selector in GDT
276 UINT32 RevFlatStack;
277
278 //
279 // A low memory stack
280 //
281 CHAR8 Stack[LOW_STACK_SIZE];
282
283 //
284 // Stack for flat mode after reverse thunk
285 // @bug - This may no longer be necessary if the reverse thunk interface
286 // is changed to have the flat stack in a different location.
287 //
288 CHAR8 RevThunkStack[LOW_STACK_SIZE];
289
290 //
291 // Legacy16 Init memory map info
292 //
293 EFI_TO_COMPATIBILITY16_INIT_TABLE EfiToLegacy16InitTable;
294
295 EFI_TO_COMPATIBILITY16_BOOT_TABLE EfiToLegacy16BootTable;
296
297 CHAR8 InterruptRedirectionCode[32];
298 EFI_LEGACY_INSTALL_PCI_HANDLER PciHandler;
299 EFI_DISPATCH_OPROM_TABLE DispatchOpromTable;
300 BBS_TABLE BbsTable[MAX_BBS_ENTRIES];
301 } LOW_MEMORY_THUNK;
302
303 #elif defined (MDE_CPU_X64)
304
305 typedef struct {
306 //
307 // Space for the code
308 // The address of Code is also the beginning of the relocated Thunk code
309 //
310 CHAR8 Code[4096]; // ?
311
312 //
313 // Data for the code (cs releative)
314 //
315 DESCRIPTOR64 X64GdtDesc; // Protected mode GDT
316 DESCRIPTOR64 X64IdtDesc; // Protected mode IDT
317 UINTN X64Ss;
318 UINTN X64Esp;
319
320 UINTN RealStack;
321 DESCRIPTOR32 RealModeIdtDesc;
322 DESCRIPTOR32 RealModeGdtDesc;
323
324 //
325 // real-mode GDT (temporary GDT with two real mode segment descriptors)
326 //
327 GDT64 RealModeGdt[NUM_REAL_GDT_ENTRIES];
328 UINT64 PageMapLevel4;
329
330 //
331 // A low memory stack
332 //
333 CHAR8 Stack[LOW_STACK_SIZE];
334
335 //
336 // Legacy16 Init memory map info
337 //
338 EFI_TO_COMPATIBILITY16_INIT_TABLE EfiToLegacy16InitTable;
339
340 EFI_TO_COMPATIBILITY16_BOOT_TABLE EfiToLegacy16BootTable;
341
342 CHAR8 InterruptRedirectionCode[32];
343 EFI_LEGACY_INSTALL_PCI_HANDLER PciHandler;
344 EFI_DISPATCH_OPROM_TABLE DispatchOpromTable;
345 BBS_TABLE BbsTable[MAX_BBS_ENTRIES];
346 } LOW_MEMORY_THUNK;
347
348 #elif defined (MDE_CPU_IPF)
349
350 typedef struct {
351 //
352 // Space for the code
353 // The address of Code is also the beginning of the relocated Thunk code
354 //
355 CHAR8 Code[4096]; // ?
356 //
357 // The address of the Reverse Thunk code
358 // Note that this member CONTAINS the address of the relocated reverse thunk
359 // code unlike the member variable 'Code', which IS the address of the Thunk
360 // code.
361 //
362 UINT32 LowReverseThunkStart;
363
364 //
365 // Data for the code (cs releative)
366 //
367 DESCRIPTOR32 GdtDesc; // Protected mode GDT
368 DESCRIPTOR32 IdtDesc; // Protected mode IDT
369 UINT32 FlatSs;
370 UINT32 FlatEsp;
371
372 UINT32 LowCodeSelector; // Low code selector in GDT
373 UINT32 LowDataSelector; // Low data selector in GDT
374 UINT32 LowStack;
375 DESCRIPTOR32 RealModeIdtDesc;
376
377 //
378 // real-mode GDT (temporary GDT with two real mode segment descriptors)
379 //
380 GDT32 RealModeGdt[NUM_REAL_GDT_ENTRIES];
381 DESCRIPTOR32 RealModeGdtDesc;
382
383 //
384 // Members specifically for the reverse thunk
385 // The RevReal* members are used to store the current state of real mode
386 // before performing the reverse thunk. The RevFlat* members must be set
387 // before calling the reverse thunk assembly code.
388 //
389 UINT16 RevRealDs;
390 UINT16 RevRealSs;
391 UINT32 RevRealEsp;
392 DESCRIPTOR32 RevRealIdtDesc;
393 UINT16 RevFlatDataSelector; // Flat data selector in GDT
394 UINT32 RevFlatStack;
395
396 //
397 // A low memory stack
398 //
399 CHAR8 Stack[LOW_STACK_SIZE];
400
401 //
402 // Stack for flat mode after reverse thunk
403 // @bug - This may no longer be necessary if the reverse thunk interface
404 // is changed to have the flat stack in a different location.
405 //
406 CHAR8 RevThunkStack[LOW_STACK_SIZE];
407
408 //
409 // Legacy16 Init memory map info
410 //
411 EFI_TO_COMPATIBILITY16_INIT_TABLE EfiToLegacy16InitTable;
412
413 EFI_TO_COMPATIBILITY16_BOOT_TABLE EfiToLegacy16BootTable;
414
415 CHAR8 InterruptRedirectionCode[32];
416 EFI_LEGACY_INSTALL_PCI_HANDLER PciHandler;
417 EFI_DISPATCH_OPROM_TABLE DispatchOpromTable;
418 BBS_TABLE BbsTable[MAX_BBS_ENTRIES];
419 } LOW_MEMORY_THUNK;
420
421 #endif
422
423 //
424 // PnP Expansion Header
425 //
426 typedef struct {
427 UINT32 PnpSignature;
428 UINT8 Revision;
429 UINT8 Length;
430 UINT16 NextHeader;
431 UINT8 Reserved1;
432 UINT8 Checksum;
433 UINT32 DeviceId;
434 UINT16 MfgPointer;
435 UINT16 ProductNamePointer;
436 UINT8 Class;
437 UINT8 SubClass;
438 UINT8 Interface;
439 UINT8 DeviceIndicators;
440 UINT16 Bcv;
441 UINT16 DisconnectVector;
442 UINT16 Bev;
443 UINT16 Reserved2;
444 UINT16 StaticResourceVector;
445 } LEGACY_PNP_EXPANSION_HEADER;
446
447 typedef struct {
448 UINT8 PciSegment;
449 UINT8 PciBus;
450 UINT8 PciDevice;
451 UINT8 PciFunction;
452 UINT16 Vid;
453 UINT16 Did;
454 UINT16 SysSid;
455 UINT16 SVid;
456 UINT8 Class;
457 UINT8 SubClass;
458 UINT8 Interface;
459 UINT8 Reserved;
460 UINTN RomStart;
461 UINTN ManufacturerString;
462 UINTN ProductNameString;
463 } LEGACY_ROM_AND_BBS_TABLE;
464
465 //
466 // Structure how EFI has mapped a devices HDD drive numbers.
467 // Boot to EFI aware OS or shell requires this mapping when
468 // 16-bit CSM assigns drive numbers.
469 // This mapping is ignored booting to a legacy OS.
470 //
471 typedef struct {
472 UINT8 PciSegment;
473 UINT8 PciBus;
474 UINT8 PciDevice;
475 UINT8 PciFunction;
476 UINT8 StartDriveNumber;
477 UINT8 EndDriveNumber;
478 } LEGACY_EFI_HDD_TABLE;
479
480 //
481 // This data is passed to Leacy16Boot
482 //
483 typedef enum {
484 EfiAcpiAddressRangeMemory = 1,
485 EfiAcpiAddressRangeReserved = 2,
486 EfiAcpiAddressRangeACPI = 3,
487 EfiAcpiAddressRangeNVS = 4,
488 EfiAddressRangePersistentMemory = 7
489 } EFI_ACPI_MEMORY_TYPE;
490
491 typedef struct {
492 UINT64 BaseAddr;
493 UINT64 Length;
494 EFI_ACPI_MEMORY_TYPE Type;
495 } EFI_E820_ENTRY64;
496
497 typedef struct {
498 UINT32 BassAddrLow;
499 UINT32 BaseAddrHigh;
500 UINT32 LengthLow;
501 UINT32 LengthHigh;
502 EFI_ACPI_MEMORY_TYPE Type;
503 } EFI_E820_ENTRY;
504
505 #pragma pack()
506
507 extern BBS_TABLE *mBbsTable;
508
509 extern EFI_GENERIC_MEMORY_TEST_PROTOCOL *gGenMemoryTest;
510
511 #define PORT_70 0x70
512 #define PORT_71 0x71
513
514 #define CMOS_0A 0x0a ///< Status register A
515 #define CMOS_0D 0x0d ///< Status register D
516 #define CMOS_0E 0x0e ///< Diagnostic Status
517 #define CMOS_0F 0x0f ///< Shutdown status
518 #define CMOS_10 0x10 ///< Floppy type
519 #define CMOS_12 0x12 ///< IDE type
520 #define CMOS_14 0x14 ///< Same as BDA 40:10
521 #define CMOS_15 0x15 ///< Low byte of base memory in 1k increments
522 #define CMOS_16 0x16 ///< High byte of base memory in 1k increments
523 #define CMOS_17 0x17 ///< Low byte of 1MB+ memory in 1k increments - max 15 MB
524 #define CMOS_18 0x18 ///< High byte of 1MB+ memory in 1k increments - max 15 MB
525 #define CMOS_19 0x19 ///< C: extended drive type
526 #define CMOS_1A 0x1a ///< D: extended drive type
527 #define CMOS_2E 0x2e ///< Most significient byte of standard checksum
528 #define CMOS_2F 0x2f ///< Least significient byte of standard checksum
529 #define CMOS_30 0x30 ///< CMOS 0x17
530 #define CMOS_31 0x31 ///< CMOS 0x18
531 #define CMOS_32 0x32 ///< Century byte
532
533 //
534 // 8254 Timer registers
535 //
536 #define TIMER0_COUNT_PORT 0x40
537 #define TIMER1_COUNT_PORT 0x41
538 #define TIMER2_COUNT_PORT 0x42
539 #define TIMER_CONTROL_PORT 0x43
540
541 //
542 // Timer 0, Read/Write LSB then MSB, Square wave output, binary count use.
543 //
544 #define TIMER0_CONTROL_WORD 0x36
545
546 #define LEGACY_BIOS_INSTANCE_SIGNATURE SIGNATURE_32 ('L', 'B', 'I', 'T')
547 typedef struct {
548 UINTN Signature;
549
550 EFI_HANDLE Handle;
551 EFI_LEGACY_BIOS_PROTOCOL LegacyBios;
552
553 EFI_HANDLE ImageHandle;
554
555 //
556 // CPU Architectural Protocol
557 //
558 EFI_CPU_ARCH_PROTOCOL *Cpu;
559
560 //
561 // Timer Architectural Protocol
562 //
563 EFI_TIMER_ARCH_PROTOCOL *Timer;
564 BOOLEAN TimerUses8254;
565
566 //
567 // Protocol to Lock and Unlock 0xc0000 - 0xfffff
568 //
569 EFI_LEGACY_REGION2_PROTOCOL *LegacyRegion;
570
571 EFI_LEGACY_BIOS_PLATFORM_PROTOCOL *LegacyBiosPlatform;
572
573 //
574 // Interrupt control for thunk and PCI IRQ
575 //
576 EFI_LEGACY_8259_PROTOCOL *Legacy8259;
577
578 //
579 // PCI Interrupt PIRQ control
580 //
581 EFI_LEGACY_INTERRUPT_PROTOCOL *LegacyInterrupt;
582
583 //
584 // Generic Memory Test
585 //
586 EFI_GENERIC_MEMORY_TEST_PROTOCOL *GenericMemoryTest;
587
588 //
589 // TRUE if PCI Interupt Line registers have been programmed.
590 //
591 BOOLEAN PciInterruptLine;
592
593 //
594 // Code space below 1MB needed by thunker to transition to real mode.
595 // Contains stack and real mode code fragments
596 //
597 LOW_MEMORY_THUNK *IntThunk;
598
599 //
600 // Starting shadow address of the Legacy BIOS
601 //
602 UINT32 BiosStart;
603 UINT32 LegacyBiosImageSize;
604
605 //
606 // Start of variables used by CsmItp.mac ITP macro file and/os LegacyBios
607 //
608 UINT8 Dump[4];
609
610 //
611 // $EFI Legacy16 code entry info in memory < 1 MB;
612 //
613 EFI_COMPATIBILITY16_TABLE *Legacy16Table;
614 VOID *Legacy16InitPtr;
615 VOID *Legacy16BootPtr;
616 VOID *InternalIrqRoutingTable;
617 UINT32 NumberIrqRoutingEntries;
618 VOID *BbsTablePtr;
619 VOID *HddTablePtr;
620 UINT32 NumberHddControllers;
621
622 //
623 // Cached copy of Legacy16 entry point
624 //
625 UINT16 Legacy16CallSegment;
626 UINT16 Legacy16CallOffset;
627
628 //
629 // Returned from $EFI and passed in to OPROMS
630 //
631 UINT16 PnPInstallationCheckSegment;
632 UINT16 PnPInstallationCheckOffset;
633
634 //
635 // E820 table
636 //
637 EFI_E820_ENTRY E820Table[EFI_MAX_E820_ENTRY];
638 UINT32 NumberE820Entries;
639
640 //
641 // True if legacy VGA INT 10h handler installed
642 //
643 BOOLEAN VgaInstalled;
644
645 //
646 // Number of IDE drives
647 //
648 UINT8 IdeDriveCount;
649
650 //
651 // Current Free Option ROM space. An option ROM must NOT go past
652 // BiosStart.
653 //
654 UINT32 OptionRom;
655
656 //
657 // Save Legacy16 unexpected interrupt vector. Reprogram INT 68-6F from
658 // EFI values to legacy value just before boot.
659 //
660 UINT32 BiosUnexpectedInt;
661 UINT32 ThunkSavedInt[8];
662 UINT16 ThunkSeg;
663 LEGACY_EFI_HDD_TABLE *LegacyEfiHddTable;
664 UINT16 LegacyEfiHddTableIndex;
665 UINT8 DiskEnd;
666 UINT8 Disk4075;
667 UINT16 TraceIndex;
668 UINT16 Trace[0x200];
669
670 //
671 // Indicate that whether GenericLegacyBoot is entered or not
672 //
673 BOOLEAN LegacyBootEntered;
674
675 //
676 // CSM16 PCI Interface Version
677 //
678 UINT16 Csm16PciInterfaceVersion;
679
680 } LEGACY_BIOS_INSTANCE;
681
682
683 #pragma pack(1)
684
685 /*
686 40:00-01 Com1
687 40:02-03 Com2
688 40:04-05 Com3
689 40:06-07 Com4
690 40:08-09 Lpt1
691 40:0A-0B Lpt2
692 40:0C-0D Lpt3
693 40:0E-0E Ebda segment
694 40:10-11 MachineConfig
695 40:12 Bda12 - skip
696 40:13-14 MemSize below 1MB
697 40:15-16 Bda15_16 - skip
698 40:17 Keyboard Shift status
699 40:18-19 Bda18_19 - skip
700 40:1A-1B Key buffer head
701 40:1C-1D Key buffer tail
702 40:1E-3D Bda1E_3D- key buffer -skip
703 40:3E-3F FloppyData 3E = Calibration status 3F = Motor status
704 40:40 FloppyTimeout
705 40:41-74 Bda41_74 - skip
706 40:75 Number of HDD drives
707 40:76-77 Bda76_77 - skip
708 40:78-79 78 = Lpt1 timeout, 79 = Lpt2 timeout
709 40:7A-7B 7A = Lpt3 timeout, 7B = Lpt4 timeout
710 40:7C-7D 7C = Com1 timeout, 7D = Com2 timeout
711 40:7E-7F 7E = Com3 timeout, 7F = Com4 timeout
712 40:80-81 Pointer to start of key buffer
713 40:82-83 Pointer to end of key buffer
714 40:84-87 Bda84_87 - skip
715 40:88 HDD Data Xmit rate
716 40:89-8f skip
717 40:90 Floppy data rate
718 40:91-95 skip
719 40:96 Keyboard Status
720 40:97 LED Status
721 40:98-101 skip
722 */
723 typedef struct {
724 UINT16 Com1;
725 UINT16 Com2;
726 UINT16 Com3;
727 UINT16 Com4;
728 UINT16 Lpt1;
729 UINT16 Lpt2;
730 UINT16 Lpt3;
731 UINT16 Ebda;
732 UINT16 MachineConfig;
733 UINT8 Bda12;
734 UINT16 MemSize;
735 UINT8 Bda15_16[0x02];
736 UINT8 ShiftStatus;
737 UINT8 Bda18_19[0x02];
738 UINT16 KeyHead;
739 UINT16 KeyTail;
740 UINT16 Bda1E_3D[0x10];
741 UINT16 FloppyData;
742 UINT8 FloppyTimeout;
743 UINT8 Bda41_74[0x34];
744 UINT8 NumberOfDrives;
745 UINT8 Bda76_77[0x02];
746 UINT16 Lpt1_2Timeout;
747 UINT16 Lpt3_4Timeout;
748 UINT16 Com1_2Timeout;
749 UINT16 Com3_4Timeout;
750 UINT16 KeyStart;
751 UINT16 KeyEnd;
752 UINT8 Bda84_87[0x4];
753 UINT8 DataXmit;
754 UINT8 Bda89_8F[0x07];
755 UINT8 FloppyXRate;
756 UINT8 Bda91_95[0x05];
757 UINT8 KeyboardStatus;
758 UINT8 LedStatus;
759 } BDA_STRUC;
760 #pragma pack()
761
762 #define LEGACY_BIOS_INSTANCE_FROM_THIS(this) CR (this, LEGACY_BIOS_INSTANCE, LegacyBios, LEGACY_BIOS_INSTANCE_SIGNATURE)
763
764 /**
765 Thunk to 16-bit real mode and execute a software interrupt with a vector
766 of BiosInt. Regs will contain the 16-bit register context on entry and
767 exit.
768
769 @param This Protocol instance pointer.
770 @param BiosInt Processor interrupt vector to invoke
771 @param Regs Register contexted passed into (and returned) from thunk to
772 16-bit mode
773
774 @retval FALSE Thunk completed, and there were no BIOS errors in the target code.
775 See Regs for status.
776 @retval TRUE There was a BIOS erro in the target code.
777
778 **/
779 BOOLEAN
780 EFIAPI
781 LegacyBiosInt86 (
782 IN EFI_LEGACY_BIOS_PROTOCOL *This,
783 IN UINT8 BiosInt,
784 IN EFI_IA32_REGISTER_SET *Regs
785 );
786
787
788 /**
789 Thunk to 16-bit real mode and call Segment:Offset. Regs will contain the
790 16-bit register context on entry and exit. Arguments can be passed on
791 the Stack argument
792
793 @param This Protocol instance pointer.
794 @param Segment Segemnt of 16-bit mode call
795 @param Offset Offset of 16-bit mdoe call
796 @param Regs Register contexted passed into (and returned) from
797 thunk to 16-bit mode
798 @param Stack Caller allocated stack used to pass arguments
799 @param StackSize Size of Stack in bytes
800
801 @retval FALSE Thunk completed, and there were no BIOS errors in
802 the target code. See Regs for status.
803 @retval TRUE There was a BIOS erro in the target code.
804
805 **/
806 BOOLEAN
807 EFIAPI
808 LegacyBiosFarCall86 (
809 IN EFI_LEGACY_BIOS_PROTOCOL *This,
810 IN UINT16 Segment,
811 IN UINT16 Offset,
812 IN EFI_IA32_REGISTER_SET *Regs,
813 IN VOID *Stack,
814 IN UINTN StackSize
815 );
816
817
818 /**
819 Test to see if a legacy PCI ROM exists for this device. Optionally return
820 the Legacy ROM instance for this PCI device.
821
822 @param This Protocol instance pointer.
823 @param PciHandle The PCI PC-AT OPROM from this devices ROM BAR will
824 be loaded
825 @param RomImage Return the legacy PCI ROM for this device
826 @param RomSize Size of ROM Image
827 @param Flags Indicates if ROM found and if PC-AT.
828
829 @retval EFI_SUCCESS Legacy Option ROM available for this device
830 @retval EFI_UNSUPPORTED Legacy Option ROM not supported.
831
832 **/
833 EFI_STATUS
834 EFIAPI
835 LegacyBiosCheckPciRom (
836 IN EFI_LEGACY_BIOS_PROTOCOL *This,
837 IN EFI_HANDLE PciHandle,
838 OUT VOID **RomImage, OPTIONAL
839 OUT UINTN *RomSize, OPTIONAL
840 OUT UINTN *Flags
841 );
842
843
844 /**
845 Assign drive number to legacy HDD drives prior to booting an EFI
846 aware OS so the OS can access drives without an EFI driver.
847 Note: BBS compliant drives ARE NOT available until this call by
848 either shell or EFI.
849
850 @param This Protocol instance pointer.
851 @param BbsCount Number of BBS_TABLE structures
852 @param BbsTable List BBS entries
853
854 @retval EFI_SUCCESS Drive numbers assigned
855
856 **/
857 EFI_STATUS
858 EFIAPI
859 LegacyBiosPrepareToBootEfi (
860 IN EFI_LEGACY_BIOS_PROTOCOL *This,
861 OUT UINT16 *BbsCount,
862 OUT BBS_TABLE **BbsTable
863 );
864
865
866 /**
867 To boot from an unconventional device like parties and/or execute
868 HDD diagnostics.
869
870 @param This Protocol instance pointer.
871 @param Attributes How to interpret the other input parameters
872 @param BbsEntry The 0-based index into the BbsTable for the parent
873 device.
874 @param BeerData Pointer to the 128 bytes of ram BEER data.
875 @param ServiceAreaData Pointer to the 64 bytes of raw Service Area data.
876 The caller must provide a pointer to the specific
877 Service Area and not the start all Service Areas.
878 EFI_INVALID_PARAMETER if error. Does NOT return if no error.
879
880 **/
881 EFI_STATUS
882 EFIAPI
883 LegacyBiosBootUnconventionalDevice (
884 IN EFI_LEGACY_BIOS_PROTOCOL *This,
885 IN UDC_ATTRIBUTES Attributes,
886 IN UINTN BbsEntry,
887 IN VOID *BeerData,
888 IN VOID *ServiceAreaData
889 );
890
891
892 /**
893 Load a legacy PC-AT OPROM on the PciHandle device. Return information
894 about how many disks were added by the OPROM and the shadow address and
895 size. DiskStart & DiskEnd are INT 13h drive letters. Thus 0x80 is C:
896
897 @param This Protocol instance pointer.
898 @param PciHandle The PCI PC-AT OPROM from this devices ROM BAR will
899 be loaded. This value is NULL if RomImage is
900 non-NULL. This is the normal case.
901 @param RomImage A PCI PC-AT ROM image. This argument is non-NULL
902 if there is no hardware associated with the ROM
903 and thus no PciHandle, otherwise is must be NULL.
904 Example is PXE base code.
905 @param Flags Indicates if ROM found and if PC-AT.
906 @param DiskStart Disk number of first device hooked by the ROM. If
907 DiskStart is the same as DiskEnd no disked were
908 hooked.
909 @param DiskEnd Disk number of the last device hooked by the ROM.
910 @param RomShadowAddress Shadow address of PC-AT ROM
911 @param RomShadowedSize Size of RomShadowAddress in bytes
912
913 @retval EFI_SUCCESS Legacy ROM loaded for this device
914 @retval EFI_INVALID_PARAMETER PciHandle not found
915 @retval EFI_UNSUPPORTED There is no PCI ROM in the ROM BAR or no onboard
916 ROM
917
918 **/
919 EFI_STATUS
920 EFIAPI
921 LegacyBiosInstallPciRom (
922 IN EFI_LEGACY_BIOS_PROTOCOL * This,
923 IN EFI_HANDLE PciHandle,
924 IN VOID **RomImage,
925 OUT UINTN *Flags,
926 OUT UINT8 *DiskStart, OPTIONAL
927 OUT UINT8 *DiskEnd, OPTIONAL
928 OUT VOID **RomShadowAddress, OPTIONAL
929 OUT UINT32 *RomShadowedSize OPTIONAL
930 );
931
932
933 /**
934 Fill in the standard BDA for Keyboard LEDs
935
936 @param This Protocol instance pointer.
937 @param Leds Current LED status
938
939 @retval EFI_SUCCESS It should always work.
940
941 **/
942 EFI_STATUS
943 EFIAPI
944 LegacyBiosUpdateKeyboardLedStatus (
945 IN EFI_LEGACY_BIOS_PROTOCOL *This,
946 IN UINT8 Leds
947 );
948
949
950 /**
951 Get all BBS info
952
953 @param This Protocol instance pointer.
954 @param HddCount Number of HDD_INFO structures
955 @param HddInfo Onboard IDE controller information
956 @param BbsCount Number of BBS_TABLE structures
957 @param BbsTable List BBS entries
958
959 @retval EFI_SUCCESS Tables returned
960 @retval EFI_NOT_FOUND resource not found
961 @retval EFI_DEVICE_ERROR can not get BBS table
962
963 **/
964 EFI_STATUS
965 EFIAPI
966 LegacyBiosGetBbsInfo (
967 IN EFI_LEGACY_BIOS_PROTOCOL *This,
968 OUT UINT16 *HddCount,
969 OUT HDD_INFO **HddInfo,
970 OUT UINT16 *BbsCount,
971 OUT BBS_TABLE **BbsTable
972 );
973
974
975 /**
976 Shadow all legacy16 OPROMs that haven't been shadowed.
977 Warning: Use this with caution. This routine disconnects all EFI
978 drivers. If used externally then caller must re-connect EFI
979 drivers.
980
981 @param This Protocol instance pointer.
982
983 @retval EFI_SUCCESS OPROMs shadowed
984
985 **/
986 EFI_STATUS
987 EFIAPI
988 LegacyBiosShadowAllLegacyOproms (
989 IN EFI_LEGACY_BIOS_PROTOCOL *This
990 );
991
992
993 /**
994 Attempt to legacy boot the BootOption. If the EFI contexted has been
995 compromised this function will not return.
996
997 @param This Protocol instance pointer.
998 @param BbsDevicePath EFI Device Path from BootXXXX variable.
999 @param LoadOptionsSize Size of LoadOption in size.
1000 @param LoadOptions LoadOption from BootXXXX variable
1001
1002 @retval EFI_SUCCESS Removable media not present
1003
1004 **/
1005 EFI_STATUS
1006 EFIAPI
1007 LegacyBiosLegacyBoot (
1008 IN EFI_LEGACY_BIOS_PROTOCOL *This,
1009 IN BBS_BBS_DEVICE_PATH *BbsDevicePath,
1010 IN UINT32 LoadOptionsSize,
1011 IN VOID *LoadOptions
1012 );
1013
1014
1015 /**
1016 Allocate memory < 1 MB and copy the thunker code into low memory. Se up
1017 all the descriptors.
1018
1019 @param Private Private context for Legacy BIOS
1020
1021 @retval EFI_SUCCESS Should only pass.
1022
1023 **/
1024 EFI_STATUS
1025 LegacyBiosInitializeThunk (
1026 IN LEGACY_BIOS_INSTANCE *Private
1027 );
1028
1029
1030 /**
1031 Fill in the standard BDA and EBDA stuff before Legacy16 load
1032
1033 @param Private Legacy BIOS Instance data
1034
1035 @retval EFI_SUCCESS It should always work.
1036
1037 **/
1038 EFI_STATUS
1039 LegacyBiosInitBda (
1040 IN LEGACY_BIOS_INSTANCE *Private
1041 );
1042
1043
1044 /**
1045 Collect IDE Inquiry data from the IDE disks
1046
1047 @param Private Legacy BIOS Instance data
1048 @param HddInfo Hdd Information
1049 @param Flag Reconnect IdeController or not
1050
1051 @retval EFI_SUCCESS It should always work.
1052
1053 **/
1054 EFI_STATUS
1055 LegacyBiosBuildIdeData (
1056 IN LEGACY_BIOS_INSTANCE *Private,
1057 IN HDD_INFO **HddInfo,
1058 IN UINT16 Flag
1059 );
1060
1061
1062 /**
1063 Enable ide controller. This gets disabled when LegacyBoot.c is about
1064 to run the Option ROMs.
1065
1066 @param Private Legacy BIOS Instance data
1067
1068
1069 **/
1070 VOID
1071 EnableIdeController (
1072 IN LEGACY_BIOS_INSTANCE *Private
1073 );
1074
1075
1076 /**
1077 If the IDE channel is in compatibility (legacy) mode, remove all
1078 PCI I/O BAR addresses from the controller.
1079
1080 @param IdeController The handle of target IDE controller
1081
1082
1083 **/
1084 VOID
1085 InitLegacyIdeController (
1086 IN EFI_HANDLE IdeController
1087 );
1088
1089
1090 /**
1091 Program the interrupt routing register in all the PCI devices. On a PC AT system
1092 this register contains the 8259 IRQ vector that matches it's PCI interrupt.
1093
1094 @param Private Legacy BIOS Instance data
1095
1096 @retval EFI_SUCCESS Succeed.
1097 @retval EFI_ALREADY_STARTED All PCI devices have been processed.
1098
1099 **/
1100 EFI_STATUS
1101 PciProgramAllInterruptLineRegisters (
1102 IN LEGACY_BIOS_INSTANCE *Private
1103 );
1104
1105
1106 /**
1107 Collect EFI Info about legacy devices.
1108
1109 @param Private Legacy BIOS Instance data
1110
1111 @retval EFI_SUCCESS It should always work.
1112
1113 **/
1114 EFI_STATUS
1115 LegacyBiosBuildSioData (
1116 IN LEGACY_BIOS_INSTANCE *Private
1117 );
1118
1119
1120 /**
1121 Shadow all the PCI legacy ROMs. Use data from the Legacy BIOS Protocol
1122 to chose the order. Skip any devices that have already have legacy
1123 BIOS run.
1124
1125 @param Private Protocol instance pointer.
1126
1127 @retval EFI_SUCCESS Succeed.
1128 @retval EFI_UNSUPPORTED Cannot get VGA device handle.
1129
1130 **/
1131 EFI_STATUS
1132 PciShadowRoms (
1133 IN LEGACY_BIOS_INSTANCE *Private
1134 );
1135
1136
1137 /**
1138 Fill in the standard BDA and EBDA stuff prior to legacy Boot
1139
1140 @param Private Legacy BIOS Instance data
1141
1142 @retval EFI_SUCCESS It should always work.
1143
1144 **/
1145 EFI_STATUS
1146 LegacyBiosCompleteBdaBeforeBoot (
1147 IN LEGACY_BIOS_INSTANCE *Private
1148 );
1149
1150
1151 /**
1152 Fill in the standard CMOS stuff before Legacy16 load
1153
1154 @param Private Legacy BIOS Instance data
1155
1156 @retval EFI_SUCCESS It should always work.
1157
1158 **/
1159 EFI_STATUS
1160 LegacyBiosInitCmos (
1161 IN LEGACY_BIOS_INSTANCE *Private
1162 );
1163
1164
1165 /**
1166 Fill in the standard CMOS stuff prior to legacy Boot
1167
1168 @param Private Legacy BIOS Instance data
1169
1170 @retval EFI_SUCCESS It should always work.
1171
1172 **/
1173 EFI_STATUS
1174 LegacyBiosCompleteStandardCmosBeforeBoot (
1175 IN LEGACY_BIOS_INSTANCE *Private
1176 );
1177
1178
1179 /**
1180 Contains the code that is copied into low memory (below 640K).
1181 This code reflects interrupts 0x68-0x6f to interrupts 0x08-0x0f.
1182 This template must be copied into low memory, and the IDT entries
1183 0x68-0x6F must be point to the low memory copy of this code. Each
1184 entry is 4 bytes long, so IDT entries 0x68-0x6F can be easily
1185 computed.
1186
1187 **/
1188 VOID
1189 InterruptRedirectionTemplate (
1190 VOID
1191 );
1192
1193
1194 /**
1195 Build the E820 table.
1196
1197 @param Private Legacy BIOS Instance data
1198 @param Size Size of E820 Table
1199
1200 @retval EFI_SUCCESS It should always work.
1201
1202 **/
1203 EFI_STATUS
1204 LegacyBiosBuildE820 (
1205 IN LEGACY_BIOS_INSTANCE *Private,
1206 OUT UINTN *Size
1207 );
1208
1209 /**
1210 This function is to put all AP in halt state.
1211
1212 @param Private Legacy BIOS Instance data
1213
1214 **/
1215 VOID
1216 ShutdownAPs (
1217 IN LEGACY_BIOS_INSTANCE *Private
1218 );
1219
1220 /**
1221 Worker function for LegacyBiosGetFlatDescs, retrieving content of
1222 specific registers.
1223
1224 @param IntThunk Pointer to IntThunk of Legacy BIOS context.
1225
1226 **/
1227 VOID
1228 GetRegisters (
1229 LOW_MEMORY_THUNK *IntThunk
1230 );
1231
1232 /**
1233 Routine for calling real thunk code.
1234
1235 @param RealCode The address of thunk code.
1236 @param BiosInt The Bios interrupt vector number.
1237 @param CallAddress The address of 16-bit mode call.
1238
1239 @return Status returned by real thunk code
1240
1241 **/
1242 UINTN
1243 CallRealThunkCode (
1244 UINT8 *RealCode,
1245 UINT8 BiosInt,
1246 UINT32 CallAddress
1247 );
1248
1249 /**
1250 Routine for generating soft interrupt.
1251
1252 @param Vector The interrupt vector number.
1253
1254 **/
1255 VOID
1256 GenerateSoftInit (
1257 UINT8 Vector
1258 );
1259
1260 /**
1261 Do an AllocatePages () of type AllocateMaxAddress for EfiBootServicesCode
1262 memory.
1263
1264 @param AllocateType Allocated Legacy Memory Type
1265 @param StartPageAddress Start address of range
1266 @param Pages Number of pages to allocate
1267 @param Result Result of allocation
1268
1269 @retval EFI_SUCCESS Legacy16 code loaded
1270 @retval Other No protocol installed, unload driver.
1271
1272 **/
1273 EFI_STATUS
1274 AllocateLegacyMemory (
1275 IN EFI_ALLOCATE_TYPE AllocateType,
1276 IN EFI_PHYSICAL_ADDRESS StartPageAddress,
1277 IN UINTN Pages,
1278 OUT EFI_PHYSICAL_ADDRESS *Result
1279 );
1280
1281 /**
1282 Get a region from the LegacyBios for Tiano usage. Can only be invoked once.
1283
1284 @param This Protocol instance pointer.
1285 @param LegacyMemorySize Size of required region
1286 @param Region Region to use. 00 = Either 0xE0000 or 0xF0000
1287 block Bit0 = 1 0xF0000 block Bit1 = 1 0xE0000
1288 block
1289 @param Alignment Address alignment. Bit mapped. First non-zero
1290 bit from right is alignment.
1291 @param LegacyMemoryAddress Region Assigned
1292
1293 @retval EFI_SUCCESS Region assigned
1294 @retval EFI_ACCESS_DENIED Procedure previously invoked
1295 @retval Other Region not assigned
1296
1297 **/
1298 EFI_STATUS
1299 EFIAPI
1300 LegacyBiosGetLegacyRegion (
1301 IN EFI_LEGACY_BIOS_PROTOCOL *This,
1302 IN UINTN LegacyMemorySize,
1303 IN UINTN Region,
1304 IN UINTN Alignment,
1305 OUT VOID **LegacyMemoryAddress
1306 );
1307
1308 /**
1309 Get a region from the LegacyBios for Tiano usage. Can only be invoked once.
1310
1311 @param This Protocol instance pointer.
1312 @param LegacyMemorySize Size of data to copy
1313 @param LegacyMemoryAddress Legacy Region destination address Note: must
1314 be in region assigned by
1315 LegacyBiosGetLegacyRegion
1316 @param LegacyMemorySourceAddress Source of data
1317
1318 @retval EFI_SUCCESS Region assigned
1319 @retval EFI_ACCESS_DENIED Destination outside assigned region
1320
1321 **/
1322 EFI_STATUS
1323 EFIAPI
1324 LegacyBiosCopyLegacyRegion (
1325 IN EFI_LEGACY_BIOS_PROTOCOL *This,
1326 IN UINTN LegacyMemorySize,
1327 IN VOID *LegacyMemoryAddress,
1328 IN VOID *LegacyMemorySourceAddress
1329 );
1330
1331 /**
1332 Find Legacy16 BIOS image in the FLASH device and shadow it into memory. Find
1333 the $EFI table in the shadow area. Thunk into the Legacy16 code after it had
1334 been shadowed.
1335
1336 @param Private Legacy BIOS context data
1337
1338 @retval EFI_SUCCESS Legacy16 code loaded
1339 @retval Other No protocol installed, unload driver.
1340
1341 **/
1342 EFI_STATUS
1343 ShadowAndStartLegacy16 (
1344 IN LEGACY_BIOS_INSTANCE *Private
1345 );
1346
1347 /**
1348 Checks the state of the floppy and if media is inserted.
1349
1350 This routine checks the state of the floppy and if media is inserted.
1351 There are 3 cases:
1352 No floppy present - Set BBS entry to ignore
1353 Floppy present & no media - Set BBS entry to lowest priority. We cannot
1354 set it to ignore since 16-bit CSM will
1355 indicate no floppy and thus drive A: is
1356 unusable. CSM-16 will not try floppy since
1357 lowest priority and thus not incur boot
1358 time penality.
1359 Floppy present & media - Set BBS entry to some priority.
1360
1361 @return State of floppy media
1362
1363 **/
1364 UINT8
1365 HasMediaInFloppy (
1366 VOID
1367 );
1368
1369 /**
1370 Identify drive data must be updated to actual parameters before boot.
1371 This requires updating the checksum, if it exists.
1372
1373 @param IdentifyDriveData ATA Identify Data
1374 @param Checksum checksum of the ATA Identify Data
1375
1376 @retval EFI_SUCCESS checksum calculated
1377 @retval EFI_SECURITY_VIOLATION IdentifyData invalid
1378
1379 **/
1380 EFI_STATUS
1381 CalculateIdentifyDriveChecksum (
1382 IN UINT8 *IdentifyDriveData,
1383 OUT UINT8 *Checksum
1384 );
1385
1386 /**
1387 Identify drive data must be updated to actual parameters before boot.
1388
1389 @param IdentifyDriveData ATA Identify Data
1390
1391 **/
1392 VOID
1393 UpdateIdentifyDriveData (
1394 IN UINT8 *IdentifyDriveData
1395 );
1396
1397 /**
1398 Complete build of BBS TABLE.
1399
1400 @param Private Legacy BIOS Instance data
1401 @param BbsTable BBS Table passed to 16-bit code
1402
1403 @retval EFI_SUCCESS Removable media not present
1404
1405 **/
1406 EFI_STATUS
1407 LegacyBiosBuildBbs (
1408 IN LEGACY_BIOS_INSTANCE *Private,
1409 IN BBS_TABLE *BbsTable
1410 );
1411
1412 /**
1413 Read CMOS register through index/data port.
1414
1415 @param[in] Index The index of the CMOS register to read.
1416
1417 @return The data value from the CMOS register specified by Index.
1418
1419 **/
1420 UINT8
1421 LegacyReadStandardCmos (
1422 IN UINT8 Index
1423 );
1424
1425 /**
1426 Write CMOS register through index/data port.
1427
1428 @param[in] Index The index of the CMOS register to write.
1429 @param[in] Value The value of CMOS register to write.
1430
1431 @return The value written to the CMOS register specified by Index.
1432
1433 **/
1434 UINT8
1435 LegacyWriteStandardCmos (
1436 IN UINT8 Index,
1437 IN UINT8 Value
1438 );
1439
1440 /**
1441 Calculate the new standard CMOS checksum and write it.
1442
1443 @param Private Legacy BIOS Instance data
1444
1445 @retval EFI_SUCCESS Calculate 16-bit checksum successfully
1446
1447 **/
1448 EFI_STATUS
1449 LegacyCalculateWriteStandardCmosChecksum (
1450 VOID
1451 );
1452
1453 /**
1454 Test to see if a legacy PCI ROM exists for this device. Optionally return
1455 the Legacy ROM instance for this PCI device.
1456
1457 @param[in] This Protocol instance pointer.
1458 @param[in] PciHandle The PCI PC-AT OPROM from this devices ROM BAR will be loaded
1459 @param[out] RomImage Return the legacy PCI ROM for this device
1460 @param[out] RomSize Size of ROM Image
1461 @param[out] RuntimeImageLength Runtime size of ROM Image
1462 @param[out] Flags Indicates if ROM found and if PC-AT.
1463 @param[out] OpromRevision Revision of the PCI Rom
1464 @param[out] ConfigUtilityCodeHeaderPointer of Configuration Utility Code Header
1465
1466 @return EFI_SUCCESS Legacy Option ROM available for this device
1467 @return EFI_ALREADY_STARTED This device is already managed by its Oprom
1468 @return EFI_UNSUPPORTED Legacy Option ROM not supported.
1469
1470 **/
1471 EFI_STATUS
1472 LegacyBiosCheckPciRomEx (
1473 IN EFI_LEGACY_BIOS_PROTOCOL *This,
1474 IN EFI_HANDLE PciHandle,
1475 OUT VOID **RomImage, OPTIONAL
1476 OUT UINTN *RomSize, OPTIONAL
1477 OUT UINTN *RuntimeImageLength, OPTIONAL
1478 OUT UINTN *Flags, OPTIONAL
1479 OUT UINT8 *OpromRevision, OPTIONAL
1480 OUT VOID **ConfigUtilityCodeHeader OPTIONAL
1481 );
1482
1483 /**
1484 Relocate this image under 4G memory for IPF.
1485
1486 @param ImageHandle Handle of driver image.
1487 @param SystemTable Pointer to system table.
1488
1489 @retval EFI_SUCCESS Image successfully relocated.
1490 @retval EFI_ABORTED Failed to relocate image.
1491
1492 **/
1493 EFI_STATUS
1494 RelocateImageUnder4GIfNeeded (
1495 IN EFI_HANDLE ImageHandle,
1496 IN EFI_SYSTEM_TABLE *SystemTable
1497 );
1498
1499 /**
1500 Thunk to 16-bit real mode and call Segment:Offset. Regs will contain the
1501 16-bit register context on entry and exit. Arguments can be passed on
1502 the Stack argument
1503
1504 @param This Protocol instance pointer.
1505 @param Segment Segemnt of 16-bit mode call
1506 @param Offset Offset of 16-bit mdoe call
1507 @param Regs Register contexted passed into (and returned) from thunk to
1508 16-bit mode
1509 @param Stack Caller allocated stack used to pass arguments
1510 @param StackSize Size of Stack in bytes
1511
1512 @retval FALSE Thunk completed, and there were no BIOS errors in the target code.
1513 See Regs for status.
1514 @retval TRUE There was a BIOS erro in the target code.
1515
1516 **/
1517 BOOLEAN
1518 EFIAPI
1519 InternalLegacyBiosFarCall (
1520 IN EFI_LEGACY_BIOS_PROTOCOL *This,
1521 IN UINT16 Segment,
1522 IN UINT16 Offset,
1523 IN EFI_IA32_REGISTER_SET *Regs,
1524 IN VOID *Stack,
1525 IN UINTN StackSize
1526 );
1527
1528 /**
1529 Load a legacy PC-AT OpROM for VGA controller.
1530
1531 @param Private Driver private data.
1532
1533 @retval EFI_SUCCESS Legacy ROM successfully installed for this device.
1534 @retval EFI_DEVICE_ERROR No VGA device handle found, or native EFI video
1535 driver cannot be successfully disconnected, or VGA
1536 thunk driver cannot be successfully connected.
1537
1538 **/
1539 EFI_STATUS
1540 LegacyBiosInstallVgaRom (
1541 IN LEGACY_BIOS_INSTANCE *Private
1542 );
1543
1544 #endif
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