1 /** @file 2 3 Copyright (c) 2006 - 2015, 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 24 #include <Guid/SmBios.h> 25 #include <Guid/Acpi.h> 26 #include <Guid/DxeServices.h> 27 #include <Guid/LegacyBios.h> 28 #include <Guid/StatusCodeDataTypeId.h> 29 #include <Guid/ImageAuthentication.h> 30 31 #include <Protocol/BlockIo.h> 32 #include <Protocol/LoadedImage.h> 33 #include <Protocol/PciIo.h> 34 #include <Protocol/Cpu.h> 35 #include <Protocol/Timer.h> 36 #include <Protocol/IsaIo.h> 37 #include <Protocol/LegacyRegion2.h> 38 #include <Protocol/SimpleTextIn.h> 39 #include <Protocol/LegacyInterrupt.h> 40 #include <Protocol/LegacyBios.h> 41 #include <Protocol/DiskInfo.h> 42 #include <Protocol/GenericMemoryTest.h> 43 #include <Protocol/LegacyBiosPlatform.h> 44 #include <Protocol/DevicePath.h> 45 #include <Protocol/Legacy8259.h> 46 #include <Protocol/PciRootBridgeIo.h> 47 48 #include <Library/BaseLib.h> 49 #include <Library/DebugLib.h> 50 #include <Library/UefiLib.h> 51 #include <Library/BaseMemoryLib.h> 52 #include <Library/ReportStatusCodeLib.h> 53 #include <Library/UefiRuntimeServicesTableLib.h> 54 #include <Library/HobLib.h> 55 #include <Library/UefiDriverEntryPoint.h> 56 #include <Library/MemoryAllocationLib.h> 57 #include <Library/UefiBootServicesTableLib.h> 58 #include <Library/IoLib.h> 59 #include <Library/PcdLib.h> 60 #include <Library/DevicePathLib.h> 61 #include <Library/DxeServicesTableLib.h> 62 #include <Library/PeCoffLib.h> 63 #include <Library/CacheMaintenanceLib.h> 64 #include <Library/DebugAgentLib.h> 65 66 // 67 // BUGBUG: This entry maybe changed to PCD in future and wait for 68 // redesign of BDS library 69 // 70 #define MAX_BBS_ENTRIES 0x100 71 72 // 73 // Thunk Status Codes 74 // (These apply only to errors with the thunk and not to the code that was 75 // thunked to.) 76 // 77 #define THUNK_OK 0x00 78 #define THUNK_ERR_A20_UNSUP 0x01 79 #define THUNK_ERR_A20_FAILED 0x02 80 81 // 82 // Vector base definitions 83 // 84 // 85 // 8259 Hardware definitions 86 // 87 #define LEGACY_MODE_BASE_VECTOR_MASTER 0x08 88 #define LEGACY_MODE_BASE_VECTOR_SLAVE 0x70 89 90 // 91 // The original PC used INT8-F for master PIC. Since these mapped over 92 // processor exceptions TIANO moved the master PIC to INT68-6F. 93 // 94 // The vector base for slave PIC is set as 0x70 for PC-AT compatibility. 95 // 96 #define PROTECTED_MODE_BASE_VECTOR_MASTER 0x68 97 #define PROTECTED_MODE_BASE_VECTOR_SLAVE 0x70 98 99 // 100 // When we call CSM16 functions, some CSM16 use es:[offset + 0xabcd] to get data passed from CSM32, 101 // offset + 0xabcd could overflow which exceeds 0xFFFF which is invalid in real mode. 102 // So this will keep offset as small as possible to avoid offset overflow in real mode. 103 // 104 #define NORMALIZE_EFI_SEGMENT(_Adr) (UINT16) (((UINTN) (_Adr)) >> 4) 105 #define NORMALIZE_EFI_OFFSET(_Adr) (UINT16) (((UINT16) ((UINTN) (_Adr))) & 0xf) 106 107 // 108 // Trace defines 109 // 110 // 111 #define LEGACY_BDA_TRACE 0x000 112 #define LEGACY_BIOS_TRACE 0x040 113 #define LEGACY_BOOT_TRACE 0x080 114 #define LEGACY_CMOS_TRACE 0x0C0 115 #define LEGACY_IDE_TRACE 0x100 116 #define LEGACY_MP_TRACE 0x140 117 #define LEGACY_PCI_TRACE 0x180 118 #define LEGACY_SIO_TRACE 0x1C0 119 120 #define LEGACY_PCI_TRACE_000 LEGACY_PCI_TRACE + 0x00 121 #define LEGACY_PCI_TRACE_001 LEGACY_PCI_TRACE + 0x01 122 #define LEGACY_PCI_TRACE_002 LEGACY_PCI_TRACE + 0x02 123 #define LEGACY_PCI_TRACE_003 LEGACY_PCI_TRACE + 0x03 124 #define LEGACY_PCI_TRACE_004 LEGACY_PCI_TRACE + 0x04 125 #define LEGACY_PCI_TRACE_005 LEGACY_PCI_TRACE + 0x05 126 #define LEGACY_PCI_TRACE_006 LEGACY_PCI_TRACE + 0x06 127 #define LEGACY_PCI_TRACE_007 LEGACY_PCI_TRACE + 0x07 128 #define LEGACY_PCI_TRACE_008 LEGACY_PCI_TRACE + 0x08 129 #define LEGACY_PCI_TRACE_009 LEGACY_PCI_TRACE + 0x09 130 #define LEGACY_PCI_TRACE_00A LEGACY_PCI_TRACE + 0x0A 131 #define LEGACY_PCI_TRACE_00B LEGACY_PCI_TRACE + 0x0B 132 #define LEGACY_PCI_TRACE_00C LEGACY_PCI_TRACE + 0x0C 133 #define LEGACY_PCI_TRACE_00D LEGACY_PCI_TRACE + 0x0D 134 #define LEGACY_PCI_TRACE_00E LEGACY_PCI_TRACE + 0x0E 135 #define LEGACY_PCI_TRACE_00F LEGACY_PCI_TRACE + 0x0F 136 137 #define BDA_VIDEO_MODE 0x49 138 139 #define IDE_PI_REGISTER_PNE BIT0 140 #define IDE_PI_REGISTER_SNE BIT2 141 142 typedef struct { 143 UINTN PciSegment; 144 UINTN PciBus; 145 UINTN PciDevice; 146 UINTN PciFunction; 147 UINT32 ShadowAddress; 148 UINT32 ShadowedSize; 149 UINT8 DiskStart; 150 UINT8 DiskEnd; 151 } ROM_INSTANCE_ENTRY; 152 153 // 154 // Values for RealModeGdt 155 // 156 #if defined (MDE_CPU_IA32) 157 158 #define NUM_REAL_GDT_ENTRIES 3 159 #define CONVENTIONAL_MEMORY_TOP 0xA0000 // 640 KB 160 #define INITIAL_VALUE_BELOW_1K 0x0 161 162 #elif defined (MDE_CPU_X64) 163 164 #define NUM_REAL_GDT_ENTRIES 8 165 #define CONVENTIONAL_MEMORY_TOP 0xA0000 // 640 KB 166 #define INITIAL_VALUE_BELOW_1K 0x0 167 168 #elif defined (MDE_CPU_IPF) 169 170 #define NUM_REAL_GDT_ENTRIES 3 171 #define CONVENTIONAL_MEMORY_TOP 0x80000 // 512 KB 172 #define INITIAL_VALUE_BELOW_1K 0xff 173 174 #endif 175 176 #pragma pack(1) 177 178 // 179 // Define what a processor GDT looks like 180 // 181 typedef struct { 182 UINT32 LimitLo : 16; 183 UINT32 BaseLo : 16; 184 UINT32 BaseMid : 8; 185 UINT32 Type : 4; 186 UINT32 System : 1; 187 UINT32 Dpl : 2; 188 UINT32 Present : 1; 189 UINT32 LimitHi : 4; 190 UINT32 Software : 1; 191 UINT32 Reserved : 1; 192 UINT32 DefaultSize : 1; 193 UINT32 Granularity : 1; 194 UINT32 BaseHi : 8; 195 } GDT32; 196 197 typedef struct { 198 UINT16 LimitLow; 199 UINT16 BaseLow; 200 UINT8 BaseMid; 201 UINT8 Attribute; 202 UINT8 LimitHi; 203 UINT8 BaseHi; 204 } GDT64; 205 206 // 207 // Define what a processor descriptor looks like 208 // This data structure must be kept in sync with ASM STRUCT in Thunk.inc 209 // 210 typedef struct { 211 UINT16 Limit; 212 UINT64 Base; 213 } DESCRIPTOR64; 214 215 typedef struct { 216 UINT16 Limit; 217 UINT32 Base; 218 } DESCRIPTOR32; 219 220 // 221 // Low stub lay out 222 // 223 #define LOW_STACK_SIZE (8 * 1024) // 8k? 224 #define EFI_MAX_E820_ENTRY 100 225 #define FIRST_INSTANCE 1 226 #define NOT_FIRST_INSTANCE 0 227 228 #if defined (MDE_CPU_IA32) 229 typedef struct { 230 // 231 // Space for the code 232 // The address of Code is also the beginning of the relocated Thunk code 233 // 234 CHAR8 Code[4096]; // ? 235 // 236 // The address of the Reverse Thunk code 237 // Note that this member CONTAINS the address of the relocated reverse thunk 238 // code unlike the member variable 'Code', which IS the address of the Thunk 239 // code. 240 // 241 UINT32 LowReverseThunkStart; 242 243 // 244 // Data for the code (cs releative) 245 // 246 DESCRIPTOR32 GdtDesc; // Protected mode GDT 247 DESCRIPTOR32 IdtDesc; // Protected mode IDT 248 UINT32 FlatSs; 249 UINT32 FlatEsp; 250 251 UINT32 LowCodeSelector; // Low code selector in GDT 252 UINT32 LowDataSelector; // Low data selector in GDT 253 UINT32 LowStack; 254 DESCRIPTOR32 RealModeIdtDesc; 255 256 // 257 // real-mode GDT (temporary GDT with two real mode segment descriptors) 258 // 259 GDT32 RealModeGdt[NUM_REAL_GDT_ENTRIES]; 260 DESCRIPTOR32 RealModeGdtDesc; 261 262 // 263 // Members specifically for the reverse thunk 264 // The RevReal* members are used to store the current state of real mode 265 // before performing the reverse thunk. The RevFlat* members must be set 266 // before calling the reverse thunk assembly code. 267 // 268 UINT16 RevRealDs; 269 UINT16 RevRealSs; 270 UINT32 RevRealEsp; 271 DESCRIPTOR32 RevRealIdtDesc; 272 UINT16 RevFlatDataSelector; // Flat data selector in GDT 273 UINT32 RevFlatStack; 274 275 // 276 // A low memory stack 277 // 278 CHAR8 Stack[LOW_STACK_SIZE]; 279 280 // 281 // Stack for flat mode after reverse thunk 282 // @bug - This may no longer be necessary if the reverse thunk interface 283 // is changed to have the flat stack in a different location. 284 // 285 CHAR8 RevThunkStack[LOW_STACK_SIZE]; 286 287 // 288 // Legacy16 Init memory map info 289 // 290 EFI_TO_COMPATIBILITY16_INIT_TABLE EfiToLegacy16InitTable; 291 292 EFI_TO_COMPATIBILITY16_BOOT_TABLE EfiToLegacy16BootTable; 293 294 CHAR8 InterruptRedirectionCode[32]; 295 EFI_LEGACY_INSTALL_PCI_HANDLER PciHandler; 296 EFI_DISPATCH_OPROM_TABLE DispatchOpromTable; 297 BBS_TABLE BbsTable[MAX_BBS_ENTRIES]; 298 } LOW_MEMORY_THUNK; 299 300 #elif defined (MDE_CPU_X64) 301 302 typedef struct { 303 // 304 // Space for the code 305 // The address of Code is also the beginning of the relocated Thunk code 306 // 307 CHAR8 Code[4096]; // ? 308 309 // 310 // Data for the code (cs releative) 311 // 312 DESCRIPTOR64 X64GdtDesc; // Protected mode GDT 313 DESCRIPTOR64 X64IdtDesc; // Protected mode IDT 314 UINTN X64Ss; 315 UINTN X64Esp; 316 317 UINTN RealStack; 318 DESCRIPTOR32 RealModeIdtDesc; 319 DESCRIPTOR32 RealModeGdtDesc; 320 321 // 322 // real-mode GDT (temporary GDT with two real mode segment descriptors) 323 // 324 GDT64 RealModeGdt[NUM_REAL_GDT_ENTRIES]; 325 UINT64 PageMapLevel4; 326 327 // 328 // A low memory stack 329 // 330 CHAR8 Stack[LOW_STACK_SIZE]; 331 332 // 333 // Legacy16 Init memory map info 334 // 335 EFI_TO_COMPATIBILITY16_INIT_TABLE EfiToLegacy16InitTable; 336 337 EFI_TO_COMPATIBILITY16_BOOT_TABLE EfiToLegacy16BootTable; 338 339 CHAR8 InterruptRedirectionCode[32]; 340 EFI_LEGACY_INSTALL_PCI_HANDLER PciHandler; 341 EFI_DISPATCH_OPROM_TABLE DispatchOpromTable; 342 BBS_TABLE BbsTable[MAX_BBS_ENTRIES]; 343 } LOW_MEMORY_THUNK; 344 345 #elif defined (MDE_CPU_IPF) 346 347 typedef struct { 348 // 349 // Space for the code 350 // The address of Code is also the beginning of the relocated Thunk code 351 // 352 CHAR8 Code[4096]; // ? 353 // 354 // The address of the Reverse Thunk code 355 // Note that this member CONTAINS the address of the relocated reverse thunk 356 // code unlike the member variable 'Code', which IS the address of the Thunk 357 // code. 358 // 359 UINT32 LowReverseThunkStart; 360 361 // 362 // Data for the code (cs releative) 363 // 364 DESCRIPTOR32 GdtDesc; // Protected mode GDT 365 DESCRIPTOR32 IdtDesc; // Protected mode IDT 366 UINT32 FlatSs; 367 UINT32 FlatEsp; 368 369 UINT32 LowCodeSelector; // Low code selector in GDT 370 UINT32 LowDataSelector; // Low data selector in GDT 371 UINT32 LowStack; 372 DESCRIPTOR32 RealModeIdtDesc; 373 374 // 375 // real-mode GDT (temporary GDT with two real mode segment descriptors) 376 // 377 GDT32 RealModeGdt[NUM_REAL_GDT_ENTRIES]; 378 DESCRIPTOR32 RealModeGdtDesc; 379 380 // 381 // Members specifically for the reverse thunk 382 // The RevReal* members are used to store the current state of real mode 383 // before performing the reverse thunk. The RevFlat* members must be set 384 // before calling the reverse thunk assembly code. 385 // 386 UINT16 RevRealDs; 387 UINT16 RevRealSs; 388 UINT32 RevRealEsp; 389 DESCRIPTOR32 RevRealIdtDesc; 390 UINT16 RevFlatDataSelector; // Flat data selector in GDT 391 UINT32 RevFlatStack; 392 393 // 394 // A low memory stack 395 // 396 CHAR8 Stack[LOW_STACK_SIZE]; 397 398 // 399 // Stack for flat mode after reverse thunk 400 // @bug - This may no longer be necessary if the reverse thunk interface 401 // is changed to have the flat stack in a different location. 402 // 403 CHAR8 RevThunkStack[LOW_STACK_SIZE]; 404 405 // 406 // Legacy16 Init memory map info 407 // 408 EFI_TO_COMPATIBILITY16_INIT_TABLE EfiToLegacy16InitTable; 409 410 EFI_TO_COMPATIBILITY16_BOOT_TABLE EfiToLegacy16BootTable; 411 412 CHAR8 InterruptRedirectionCode[32]; 413 EFI_LEGACY_INSTALL_PCI_HANDLER PciHandler; 414 EFI_DISPATCH_OPROM_TABLE DispatchOpromTable; 415 BBS_TABLE BbsTable[MAX_BBS_ENTRIES]; 416 } LOW_MEMORY_THUNK; 417 418 #endif 419 420 // 421 // PnP Expansion Header 422 // 423 typedef struct { 424 UINT32 PnpSignature; 425 UINT8 Revision; 426 UINT8 Length; 427 UINT16 NextHeader; 428 UINT8 Reserved1; 429 UINT8 Checksum; 430 UINT32 DeviceId; 431 UINT16 MfgPointer; 432 UINT16 ProductNamePointer; 433 UINT8 Class; 434 UINT8 SubClass; 435 UINT8 Interface; 436 UINT8 DeviceIndicators; 437 UINT16 Bcv; 438 UINT16 DisconnectVector; 439 UINT16 Bev; 440 UINT16 Reserved2; 441 UINT16 StaticResourceVector; 442 } LEGACY_PNP_EXPANSION_HEADER; 443 444 typedef struct { 445 UINT8 PciSegment; 446 UINT8 PciBus; 447 UINT8 PciDevice; 448 UINT8 PciFunction; 449 UINT16 Vid; 450 UINT16 Did; 451 UINT16 SysSid; 452 UINT16 SVid; 453 UINT8 Class; 454 UINT8 SubClass; 455 UINT8 Interface; 456 UINT8 Reserved; 457 UINTN RomStart; 458 UINTN ManufacturerString; 459 UINTN ProductNameString; 460 } LEGACY_ROM_AND_BBS_TABLE; 461 462 // 463 // Structure how EFI has mapped a devices HDD drive numbers. 464 // Boot to EFI aware OS or shell requires this mapping when 465 // 16-bit CSM assigns drive numbers. 466 // This mapping is ignored booting to a legacy OS. 467 // 468 typedef struct { 469 UINT8 PciSegment; 470 UINT8 PciBus; 471 UINT8 PciDevice; 472 UINT8 PciFunction; 473 UINT8 StartDriveNumber; 474 UINT8 EndDriveNumber; 475 } LEGACY_EFI_HDD_TABLE; 476 477 // 478 // This data is passed to Leacy16Boot 479 // 480 typedef enum { 481 EfiAcpiAddressRangeMemory = 1, 482 EfiAcpiAddressRangeReserved = 2, 483 EfiAcpiAddressRangeACPI = 3, 484 EfiAcpiAddressRangeNVS = 4, 485 EfiAddressRangePersistentMemory = 7 486 } EFI_ACPI_MEMORY_TYPE; 487 488 typedef struct { 489 UINT64 BaseAddr; 490 UINT64 Length; 491 EFI_ACPI_MEMORY_TYPE Type; 492 } EFI_E820_ENTRY64; 493 494 typedef struct { 495 UINT32 BassAddrLow; 496 UINT32 BaseAddrHigh; 497 UINT32 LengthLow; 498 UINT32 LengthHigh; 499 EFI_ACPI_MEMORY_TYPE Type; 500 } EFI_E820_ENTRY; 501 502 #pragma pack() 503 504 extern BBS_TABLE *mBbsTable; 505 506 extern EFI_GENERIC_MEMORY_TEST_PROTOCOL *gGenMemoryTest; 507 508 #define PORT_70 0x70 509 #define PORT_71 0x71 510 511 #define CMOS_0A 0x0a ///< Status register A 512 #define CMOS_0D 0x0d ///< Status register D 513 #define CMOS_0E 0x0e ///< Diagnostic Status 514 #define CMOS_0F 0x0f ///< Shutdown status 515 #define CMOS_10 0x10 ///< Floppy type 516 #define CMOS_12 0x12 ///< IDE type 517 #define CMOS_14 0x14 ///< Same as BDA 40:10 518 #define CMOS_15 0x15 ///< Low byte of base memory in 1k increments 519 #define CMOS_16 0x16 ///< High byte of base memory in 1k increments 520 #define CMOS_17 0x17 ///< Low byte of 1MB+ memory in 1k increments - max 15 MB 521 #define CMOS_18 0x18 ///< High byte of 1MB+ memory in 1k increments - max 15 MB 522 #define CMOS_19 0x19 ///< C: extended drive type 523 #define CMOS_1A 0x1a ///< D: extended drive type 524 #define CMOS_2E 0x2e ///< Most significient byte of standard checksum 525 #define CMOS_2F 0x2f ///< Least significient byte of standard checksum 526 #define CMOS_30 0x30 ///< CMOS 0x17 527 #define CMOS_31 0x31 ///< CMOS 0x18 528 #define CMOS_32 0x32 ///< Century byte 529 530 // 531 // 8254 Timer registers 532 // 533 #define TIMER0_COUNT_PORT 0x40 534 #define TIMER1_COUNT_PORT 0x41 535 #define TIMER2_COUNT_PORT 0x42 536 #define TIMER_CONTROL_PORT 0x43 537 538 // 539 // Timer 0, Read/Write LSB then MSB, Square wave output, binary count use. 540 // 541 #define TIMER0_CONTROL_WORD 0x36 542 543 #define LEGACY_BIOS_INSTANCE_SIGNATURE SIGNATURE_32 ('L', 'B', 'I', 'T') 544 typedef struct { 545 UINTN Signature; 546 547 EFI_HANDLE Handle; 548 EFI_LEGACY_BIOS_PROTOCOL LegacyBios; 549 550 EFI_HANDLE ImageHandle; 551 552 // 553 // CPU Architectural Protocol 554 // 555 EFI_CPU_ARCH_PROTOCOL *Cpu; 556 557 // 558 // Timer Architectural Protocol 559 // 560 EFI_TIMER_ARCH_PROTOCOL *Timer; 561 BOOLEAN TimerUses8254; 562 563 // 564 // Protocol to Lock and Unlock 0xc0000 - 0xfffff 565 // 566 EFI_LEGACY_REGION2_PROTOCOL *LegacyRegion; 567 568 EFI_LEGACY_BIOS_PLATFORM_PROTOCOL *LegacyBiosPlatform; 569 570 // 571 // Interrupt control for thunk and PCI IRQ 572 // 573 EFI_LEGACY_8259_PROTOCOL *Legacy8259; 574 575 // 576 // PCI Interrupt PIRQ control 577 // 578 EFI_LEGACY_INTERRUPT_PROTOCOL *LegacyInterrupt; 579 580 // 581 // Generic Memory Test 582 // 583 EFI_GENERIC_MEMORY_TEST_PROTOCOL *GenericMemoryTest; 584 585 // 586 // TRUE if PCI Interupt Line registers have been programmed. 587 // 588 BOOLEAN PciInterruptLine; 589 590 // 591 // Code space below 1MB needed by thunker to transition to real mode. 592 // Contains stack and real mode code fragments 593 // 594 LOW_MEMORY_THUNK *IntThunk; 595 596 // 597 // Starting shadow address of the Legacy BIOS 598 // 599 UINT32 BiosStart; 600 UINT32 LegacyBiosImageSize; 601 602 // 603 // Start of variables used by CsmItp.mac ITP macro file and/os LegacyBios 604 // 605 UINT8 Dump[4]; 606 607 // 608 // $EFI Legacy16 code entry info in memory < 1 MB; 609 // 610 EFI_COMPATIBILITY16_TABLE *Legacy16Table; 611 VOID *Legacy16InitPtr; 612 VOID *Legacy16BootPtr; 613 VOID *InternalIrqRoutingTable; 614 UINT32 NumberIrqRoutingEntries; 615 VOID *BbsTablePtr; 616 VOID *HddTablePtr; 617 UINT32 NumberHddControllers; 618 619 // 620 // Cached copy of Legacy16 entry point 621 // 622 UINT16 Legacy16CallSegment; 623 UINT16 Legacy16CallOffset; 624 625 // 626 // Returned from $EFI and passed in to OPROMS 627 // 628 UINT16 PnPInstallationCheckSegment; 629 UINT16 PnPInstallationCheckOffset; 630 631 // 632 // E820 table 633 // 634 EFI_E820_ENTRY E820Table[EFI_MAX_E820_ENTRY]; 635 UINT32 NumberE820Entries; 636 637 // 638 // True if legacy VGA INT 10h handler installed 639 // 640 BOOLEAN VgaInstalled; 641 642 // 643 // Number of IDE drives 644 // 645 UINT8 IdeDriveCount; 646 647 // 648 // Current Free Option ROM space. An option ROM must NOT go past 649 // BiosStart. 650 // 651 UINT32 OptionRom; 652 653 // 654 // Save Legacy16 unexpected interrupt vector. Reprogram INT 68-6F from 655 // EFI values to legacy value just before boot. 656 // 657 UINT32 BiosUnexpectedInt; 658 UINT32 ThunkSavedInt[8]; 659 UINT16 ThunkSeg; 660 LEGACY_EFI_HDD_TABLE *LegacyEfiHddTable; 661 UINT16 LegacyEfiHddTableIndex; 662 UINT8 DiskEnd; 663 UINT8 Disk4075; 664 UINT16 TraceIndex; 665 UINT16 Trace[0x200]; 666 667 // 668 // Indicate that whether GenericLegacyBoot is entered or not 669 // 670 BOOLEAN LegacyBootEntered; 671 672 // 673 // CSM16 PCI Interface Version 674 // 675 UINT16 Csm16PciInterfaceVersion; 676 677 } LEGACY_BIOS_INSTANCE; 678 679 680 #pragma pack(1) 681 682 /* 683 40:00-01 Com1 684 40:02-03 Com2 685 40:04-05 Com3 686 40:06-07 Com4 687 40:08-09 Lpt1 688 40:0A-0B Lpt2 689 40:0C-0D Lpt3 690 40:0E-0E Ebda segment 691 40:10-11 MachineConfig 692 40:12 Bda12 - skip 693 40:13-14 MemSize below 1MB 694 40:15-16 Bda15_16 - skip 695 40:17 Keyboard Shift status 696 40:18-19 Bda18_19 - skip 697 40:1A-1B Key buffer head 698 40:1C-1D Key buffer tail 699 40:1E-3D Bda1E_3D- key buffer -skip 700 40:3E-3F FloppyData 3E = Calibration status 3F = Motor status 701 40:40 FloppyTimeout 702 40:41-74 Bda41_74 - skip 703 40:75 Number of HDD drives 704 40:76-77 Bda76_77 - skip 705 40:78-79 78 = Lpt1 timeout, 79 = Lpt2 timeout 706 40:7A-7B 7A = Lpt3 timeout, 7B = Lpt4 timeout 707 40:7C-7D 7C = Com1 timeout, 7D = Com2 timeout 708 40:7E-7F 7E = Com3 timeout, 7F = Com4 timeout 709 40:80-81 Pointer to start of key buffer 710 40:82-83 Pointer to end of key buffer 711 40:84-87 Bda84_87 - skip 712 40:88 HDD Data Xmit rate 713 40:89-8f skip 714 40:90 Floppy data rate 715 40:91-95 skip 716 40:96 Keyboard Status 717 40:97 LED Status 718 40:98-101 skip 719 */ 720 typedef struct { 721 UINT16 Com1; 722 UINT16 Com2; 723 UINT16 Com3; 724 UINT16 Com4; 725 UINT16 Lpt1; 726 UINT16 Lpt2; 727 UINT16 Lpt3; 728 UINT16 Ebda; 729 UINT16 MachineConfig; 730 UINT8 Bda12; 731 UINT16 MemSize; 732 UINT8 Bda15_16[0x02]; 733 UINT8 ShiftStatus; 734 UINT8 Bda18_19[0x02]; 735 UINT16 KeyHead; 736 UINT16 KeyTail; 737 UINT16 Bda1E_3D[0x10]; 738 UINT16 FloppyData; 739 UINT8 FloppyTimeout; 740 UINT8 Bda41_74[0x34]; 741 UINT8 NumberOfDrives; 742 UINT8 Bda76_77[0x02]; 743 UINT16 Lpt1_2Timeout; 744 UINT16 Lpt3_4Timeout; 745 UINT16 Com1_2Timeout; 746 UINT16 Com3_4Timeout; 747 UINT16 KeyStart; 748 UINT16 KeyEnd; 749 UINT8 Bda84_87[0x4]; 750 UINT8 DataXmit; 751 UINT8 Bda89_8F[0x07]; 752 UINT8 FloppyXRate; 753 UINT8 Bda91_95[0x05]; 754 UINT8 KeyboardStatus; 755 UINT8 LedStatus; 756 } BDA_STRUC; 757 #pragma pack() 758 759 #define LEGACY_BIOS_INSTANCE_FROM_THIS(this) CR (this, LEGACY_BIOS_INSTANCE, LegacyBios, LEGACY_BIOS_INSTANCE_SIGNATURE) 760 761 /** 762 Thunk to 16-bit real mode and execute a software interrupt with a vector 763 of BiosInt. Regs will contain the 16-bit register context on entry and 764 exit. 765 766 @param This Protocol instance pointer. 767 @param BiosInt Processor interrupt vector to invoke 768 @param Regs Register contexted passed into (and returned) from thunk to 769 16-bit mode 770 771 @retval FALSE Thunk completed, and there were no BIOS errors in the target code. 772 See Regs for status. 773 @retval TRUE There was a BIOS erro in the target code. 774 775 **/ 776 BOOLEAN 777 EFIAPI 778 LegacyBiosInt86 ( 779 IN EFI_LEGACY_BIOS_PROTOCOL *This, 780 IN UINT8 BiosInt, 781 IN EFI_IA32_REGISTER_SET *Regs 782 ); 783 784 785 /** 786 Thunk to 16-bit real mode and call Segment:Offset. Regs will contain the 787 16-bit register context on entry and exit. Arguments can be passed on 788 the Stack argument 789 790 @param This Protocol instance pointer. 791 @param Segment Segemnt of 16-bit mode call 792 @param Offset Offset of 16-bit mdoe call 793 @param Regs Register contexted passed into (and returned) from 794 thunk to 16-bit mode 795 @param Stack Caller allocated stack used to pass arguments 796 @param StackSize Size of Stack in bytes 797 798 @retval FALSE Thunk completed, and there were no BIOS errors in 799 the target code. See Regs for status. 800 @retval TRUE There was a BIOS erro in the target code. 801 802 **/ 803 BOOLEAN 804 EFIAPI 805 LegacyBiosFarCall86 ( 806 IN EFI_LEGACY_BIOS_PROTOCOL *This, 807 IN UINT16 Segment, 808 IN UINT16 Offset, 809 IN EFI_IA32_REGISTER_SET *Regs, 810 IN VOID *Stack, 811 IN UINTN StackSize 812 ); 813 814 815 /** 816 Test to see if a legacy PCI ROM exists for this device. Optionally return 817 the Legacy ROM instance for this PCI device. 818 819 @param This Protocol instance pointer. 820 @param PciHandle The PCI PC-AT OPROM from this devices ROM BAR will 821 be loaded 822 @param RomImage Return the legacy PCI ROM for this device 823 @param RomSize Size of ROM Image 824 @param Flags Indicates if ROM found and if PC-AT. 825 826 @retval EFI_SUCCESS Legacy Option ROM availible for this device 827 @retval EFI_UNSUPPORTED Legacy Option ROM not supported. 828 829 **/ 830 EFI_STATUS 831 EFIAPI 832 LegacyBiosCheckPciRom ( 833 IN EFI_LEGACY_BIOS_PROTOCOL *This, 834 IN EFI_HANDLE PciHandle, 835 OUT VOID **RomImage, OPTIONAL 836 OUT UINTN *RomSize, OPTIONAL 837 OUT UINTN *Flags 838 ); 839 840 841 /** 842 Assign drive number to legacy HDD drives prior to booting an EFI 843 aware OS so the OS can access drives without an EFI driver. 844 Note: BBS compliant drives ARE NOT available until this call by 845 either shell or EFI. 846 847 @param This Protocol instance pointer. 848 @param BbsCount Number of BBS_TABLE structures 849 @param BbsTable List BBS entries 850 851 @retval EFI_SUCCESS Drive numbers assigned 852 853 **/ 854 EFI_STATUS 855 EFIAPI 856 LegacyBiosPrepareToBootEfi ( 857 IN EFI_LEGACY_BIOS_PROTOCOL *This, 858 OUT UINT16 *BbsCount, 859 OUT BBS_TABLE **BbsTable 860 ); 861 862 863 /** 864 To boot from an unconventional device like parties and/or execute 865 HDD diagnostics. 866 867 @param This Protocol instance pointer. 868 @param Attributes How to interpret the other input parameters 869 @param BbsEntry The 0-based index into the BbsTable for the parent 870 device. 871 @param BeerData Pointer to the 128 bytes of ram BEER data. 872 @param ServiceAreaData Pointer to the 64 bytes of raw Service Area data. 873 The caller must provide a pointer to the specific 874 Service Area and not the start all Service Areas. 875 EFI_INVALID_PARAMETER if error. Does NOT return if no error. 876 877 **/ 878 EFI_STATUS 879 EFIAPI 880 LegacyBiosBootUnconventionalDevice ( 881 IN EFI_LEGACY_BIOS_PROTOCOL *This, 882 IN UDC_ATTRIBUTES Attributes, 883 IN UINTN BbsEntry, 884 IN VOID *BeerData, 885 IN VOID *ServiceAreaData 886 ); 887 888 889 /** 890 Load a legacy PC-AT OPROM on the PciHandle device. Return information 891 about how many disks were added by the OPROM and the shadow address and 892 size. DiskStart & DiskEnd are INT 13h drive letters. Thus 0x80 is C: 893 894 @param This Protocol instance pointer. 895 @param PciHandle The PCI PC-AT OPROM from this devices ROM BAR will 896 be loaded. This value is NULL if RomImage is 897 non-NULL. This is the normal case. 898 @param RomImage A PCI PC-AT ROM image. This argument is non-NULL 899 if there is no hardware associated with the ROM 900 and thus no PciHandle, otherwise is must be NULL. 901 Example is PXE base code. 902 @param Flags Indicates if ROM found and if PC-AT. 903 @param DiskStart Disk number of first device hooked by the ROM. If 904 DiskStart is the same as DiskEnd no disked were 905 hooked. 906 @param DiskEnd Disk number of the last device hooked by the ROM. 907 @param RomShadowAddress Shadow address of PC-AT ROM 908 @param RomShadowedSize Size of RomShadowAddress in bytes 909 910 @retval EFI_SUCCESS Legacy ROM loaded for this device 911 @retval EFI_INVALID_PARAMETER PciHandle not found 912 @retval EFI_UNSUPPORTED There is no PCI ROM in the ROM BAR or no onboard 913 ROM 914 915 **/ 916 EFI_STATUS 917 EFIAPI 918 LegacyBiosInstallPciRom ( 919 IN EFI_LEGACY_BIOS_PROTOCOL * This, 920 IN EFI_HANDLE PciHandle, 921 IN VOID **RomImage, 922 OUT UINTN *Flags, 923 OUT UINT8 *DiskStart, OPTIONAL 924 OUT UINT8 *DiskEnd, OPTIONAL 925 OUT VOID **RomShadowAddress, OPTIONAL 926 OUT UINT32 *RomShadowedSize OPTIONAL 927 ); 928 929 930 /** 931 Fill in the standard BDA for Keyboard LEDs 932 933 @param This Protocol instance pointer. 934 @param Leds Current LED status 935 936 @retval EFI_SUCCESS It should always work. 937 938 **/ 939 EFI_STATUS 940 EFIAPI 941 LegacyBiosUpdateKeyboardLedStatus ( 942 IN EFI_LEGACY_BIOS_PROTOCOL *This, 943 IN UINT8 Leds 944 ); 945 946 947 /** 948 Get all BBS info 949 950 @param This Protocol instance pointer. 951 @param HddCount Number of HDD_INFO structures 952 @param HddInfo Onboard IDE controller information 953 @param BbsCount Number of BBS_TABLE structures 954 @param BbsTable List BBS entries 955 956 @retval EFI_SUCCESS Tables returned 957 @retval EFI_NOT_FOUND resource not found 958 @retval EFI_DEVICE_ERROR can not get BBS table 959 960 **/ 961 EFI_STATUS 962 EFIAPI 963 LegacyBiosGetBbsInfo ( 964 IN EFI_LEGACY_BIOS_PROTOCOL *This, 965 OUT UINT16 *HddCount, 966 OUT HDD_INFO **HddInfo, 967 OUT UINT16 *BbsCount, 968 OUT BBS_TABLE **BbsTable 969 ); 970 971 972 /** 973 Shadow all legacy16 OPROMs that haven't been shadowed. 974 Warning: Use this with caution. This routine disconnects all EFI 975 drivers. If used externally then caller must re-connect EFI 976 drivers. 977 978 @param This Protocol instance pointer. 979 980 @retval EFI_SUCCESS OPROMs shadowed 981 982 **/ 983 EFI_STATUS 984 EFIAPI 985 LegacyBiosShadowAllLegacyOproms ( 986 IN EFI_LEGACY_BIOS_PROTOCOL *This 987 ); 988 989 990 /** 991 Attempt to legacy boot the BootOption. If the EFI contexted has been 992 compromised this function will not return. 993 994 @param This Protocol instance pointer. 995 @param BbsDevicePath EFI Device Path from BootXXXX variable. 996 @param LoadOptionsSize Size of LoadOption in size. 997 @param LoadOptions LoadOption from BootXXXX variable 998 999 @retval EFI_SUCCESS Removable media not present 1000 1001 **/ 1002 EFI_STATUS 1003 EFIAPI 1004 LegacyBiosLegacyBoot ( 1005 IN EFI_LEGACY_BIOS_PROTOCOL *This, 1006 IN BBS_BBS_DEVICE_PATH *BbsDevicePath, 1007 IN UINT32 LoadOptionsSize, 1008 IN VOID *LoadOptions 1009 ); 1010 1011 1012 /** 1013 Allocate memory < 1 MB and copy the thunker code into low memory. Se up 1014 all the descriptors. 1015 1016 @param Private Private context for Legacy BIOS 1017 1018 @retval EFI_SUCCESS Should only pass. 1019 1020 **/ 1021 EFI_STATUS 1022 LegacyBiosInitializeThunk ( 1023 IN LEGACY_BIOS_INSTANCE *Private 1024 ); 1025 1026 1027 /** 1028 Fill in the standard BDA and EBDA stuff before Legacy16 load 1029 1030 @param Private Legacy BIOS Instance data 1031 1032 @retval EFI_SUCCESS It should always work. 1033 1034 **/ 1035 EFI_STATUS 1036 LegacyBiosInitBda ( 1037 IN LEGACY_BIOS_INSTANCE *Private 1038 ); 1039 1040 1041 /** 1042 Collect IDE Inquiry data from the IDE disks 1043 1044 @param Private Legacy BIOS Instance data 1045 @param HddInfo Hdd Information 1046 @param Flag Reconnect IdeController or not 1047 1048 @retval EFI_SUCCESS It should always work. 1049 1050 **/ 1051 EFI_STATUS 1052 LegacyBiosBuildIdeData ( 1053 IN LEGACY_BIOS_INSTANCE *Private, 1054 IN HDD_INFO **HddInfo, 1055 IN UINT16 Flag 1056 ); 1057 1058 1059 /** 1060 Enable ide controller. This gets disabled when LegacyBoot.c is about 1061 to run the Option ROMs. 1062 1063 @param Private Legacy BIOS Instance data 1064 1065 1066 **/ 1067 VOID 1068 EnableIdeController ( 1069 IN LEGACY_BIOS_INSTANCE *Private 1070 ); 1071 1072 1073 /** 1074 If the IDE channel is in compatibility (legacy) mode, remove all 1075 PCI I/O BAR addresses from the controller. 1076 1077 @param IdeController The handle of target IDE controller 1078 1079 1080 **/ 1081 VOID 1082 InitLegacyIdeController ( 1083 IN EFI_HANDLE IdeController 1084 ); 1085 1086 1087 /** 1088 Program the interrupt routing register in all the PCI devices. On a PC AT system 1089 this register contains the 8259 IRQ vector that matches it's PCI interrupt. 1090 1091 @param Private Legacy BIOS Instance data 1092 1093 @retval EFI_SUCCESS Succeed. 1094 @retval EFI_ALREADY_STARTED All PCI devices have been processed. 1095 1096 **/ 1097 EFI_STATUS 1098 PciProgramAllInterruptLineRegisters ( 1099 IN LEGACY_BIOS_INSTANCE *Private 1100 ); 1101 1102 1103 /** 1104 Collect EFI Info about legacy devices. 1105 1106 @param Private Legacy BIOS Instance data 1107 1108 @retval EFI_SUCCESS It should always work. 1109 1110 **/ 1111 EFI_STATUS 1112 LegacyBiosBuildSioData ( 1113 IN LEGACY_BIOS_INSTANCE *Private 1114 ); 1115 1116 1117 /** 1118 Shadow all the PCI legacy ROMs. Use data from the Legacy BIOS Protocol 1119 to chose the order. Skip any devices that have already have legacy 1120 BIOS run. 1121 1122 @param Private Protocol instance pointer. 1123 1124 @retval EFI_SUCCESS Succeed. 1125 @retval EFI_UNSUPPORTED Cannot get VGA device handle. 1126 1127 **/ 1128 EFI_STATUS 1129 PciShadowRoms ( 1130 IN LEGACY_BIOS_INSTANCE *Private 1131 ); 1132 1133 1134 /** 1135 Fill in the standard BDA and EBDA stuff prior to legacy Boot 1136 1137 @param Private Legacy BIOS Instance data 1138 1139 @retval EFI_SUCCESS It should always work. 1140 1141 **/ 1142 EFI_STATUS 1143 LegacyBiosCompleteBdaBeforeBoot ( 1144 IN LEGACY_BIOS_INSTANCE *Private 1145 ); 1146 1147 1148 /** 1149 Fill in the standard CMOS stuff before Legacy16 load 1150 1151 @param Private Legacy BIOS Instance data 1152 1153 @retval EFI_SUCCESS It should always work. 1154 1155 **/ 1156 EFI_STATUS 1157 LegacyBiosInitCmos ( 1158 IN LEGACY_BIOS_INSTANCE *Private 1159 ); 1160 1161 1162 /** 1163 Fill in the standard CMOS stuff prior to legacy Boot 1164 1165 @param Private Legacy BIOS Instance data 1166 1167 @retval EFI_SUCCESS It should always work. 1168 1169 **/ 1170 EFI_STATUS 1171 LegacyBiosCompleteStandardCmosBeforeBoot ( 1172 IN LEGACY_BIOS_INSTANCE *Private 1173 ); 1174 1175 1176 /** 1177 Contains the code that is copied into low memory (below 640K). 1178 This code reflects interrupts 0x68-0x6f to interrupts 0x08-0x0f. 1179 This template must be copied into low memory, and the IDT entries 1180 0x68-0x6F must be point to the low memory copy of this code. Each 1181 entry is 4 bytes long, so IDT entries 0x68-0x6F can be easily 1182 computed. 1183 1184 **/ 1185 VOID 1186 InterruptRedirectionTemplate ( 1187 VOID 1188 ); 1189 1190 1191 /** 1192 Build the E820 table. 1193 1194 @param Private Legacy BIOS Instance data 1195 @param Size Size of E820 Table 1196 1197 @retval EFI_SUCCESS It should always work. 1198 1199 **/ 1200 EFI_STATUS 1201 LegacyBiosBuildE820 ( 1202 IN LEGACY_BIOS_INSTANCE *Private, 1203 OUT UINTN *Size 1204 ); 1205 1206 /** 1207 This function is to put all AP in halt state. 1208 1209 @param Private Legacy BIOS Instance data 1210 1211 **/ 1212 VOID 1213 ShutdownAPs ( 1214 IN LEGACY_BIOS_INSTANCE *Private 1215 ); 1216 1217 /** 1218 Worker function for LegacyBiosGetFlatDescs, retrieving content of 1219 specific registers. 1220 1221 @param IntThunk Pointer to IntThunk of Legacy BIOS context. 1222 1223 **/ 1224 VOID 1225 GetRegisters ( 1226 LOW_MEMORY_THUNK *IntThunk 1227 ); 1228 1229 /** 1230 Routine for calling real thunk code. 1231 1232 @param RealCode The address of thunk code. 1233 @param BiosInt The Bios interrupt vector number. 1234 @param CallAddress The address of 16-bit mode call. 1235 1236 @return Status returned by real thunk code 1237 1238 **/ 1239 UINTN 1240 CallRealThunkCode ( 1241 UINT8 *RealCode, 1242 UINT8 BiosInt, 1243 UINT32 CallAddress 1244 ); 1245 1246 /** 1247 Routine for generating soft interrupt. 1248 1249 @param Vector The interrupt vector number. 1250 1251 **/ 1252 VOID 1253 GenerateSoftInit ( 1254 UINT8 Vector 1255 ); 1256 1257 /** 1258 Do an AllocatePages () of type AllocateMaxAddress for EfiBootServicesCode 1259 memory. 1260 1261 @param AllocateType Allocated Legacy Memory Type 1262 @param StartPageAddress Start address of range 1263 @param Pages Number of pages to allocate 1264 @param Result Result of allocation 1265 1266 @retval EFI_SUCCESS Legacy16 code loaded 1267 @retval Other No protocol installed, unload driver. 1268 1269 **/ 1270 EFI_STATUS 1271 AllocateLegacyMemory ( 1272 IN EFI_ALLOCATE_TYPE AllocateType, 1273 IN EFI_PHYSICAL_ADDRESS StartPageAddress, 1274 IN UINTN Pages, 1275 OUT EFI_PHYSICAL_ADDRESS *Result 1276 ); 1277 1278 /** 1279 Get a region from the LegacyBios for Tiano usage. Can only be invoked once. 1280 1281 @param This Protocol instance pointer. 1282 @param LegacyMemorySize Size of required region 1283 @param Region Region to use. 00 = Either 0xE0000 or 0xF0000 1284 block Bit0 = 1 0xF0000 block Bit1 = 1 0xE0000 1285 block 1286 @param Alignment Address alignment. Bit mapped. First non-zero 1287 bit from right is alignment. 1288 @param LegacyMemoryAddress Region Assigned 1289 1290 @retval EFI_SUCCESS Region assigned 1291 @retval EFI_ACCESS_DENIED Procedure previously invoked 1292 @retval Other Region not assigned 1293 1294 **/ 1295 EFI_STATUS 1296 EFIAPI 1297 LegacyBiosGetLegacyRegion ( 1298 IN EFI_LEGACY_BIOS_PROTOCOL *This, 1299 IN UINTN LegacyMemorySize, 1300 IN UINTN Region, 1301 IN UINTN Alignment, 1302 OUT VOID **LegacyMemoryAddress 1303 ); 1304 1305 /** 1306 Get a region from the LegacyBios for Tiano usage. Can only be invoked once. 1307 1308 @param This Protocol instance pointer. 1309 @param LegacyMemorySize Size of data to copy 1310 @param LegacyMemoryAddress Legacy Region destination address Note: must 1311 be in region assigned by 1312 LegacyBiosGetLegacyRegion 1313 @param LegacyMemorySourceAddress Source of data 1314 1315 @retval EFI_SUCCESS Region assigned 1316 @retval EFI_ACCESS_DENIED Destination outside assigned region 1317 1318 **/ 1319 EFI_STATUS 1320 EFIAPI 1321 LegacyBiosCopyLegacyRegion ( 1322 IN EFI_LEGACY_BIOS_PROTOCOL *This, 1323 IN UINTN LegacyMemorySize, 1324 IN VOID *LegacyMemoryAddress, 1325 IN VOID *LegacyMemorySourceAddress 1326 ); 1327 1328 /** 1329 Find Legacy16 BIOS image in the FLASH device and shadow it into memory. Find 1330 the $EFI table in the shadow area. Thunk into the Legacy16 code after it had 1331 been shadowed. 1332 1333 @param Private Legacy BIOS context data 1334 1335 @retval EFI_SUCCESS Legacy16 code loaded 1336 @retval Other No protocol installed, unload driver. 1337 1338 **/ 1339 EFI_STATUS 1340 ShadowAndStartLegacy16 ( 1341 IN LEGACY_BIOS_INSTANCE *Private 1342 ); 1343 1344 /** 1345 Checks the state of the floppy and if media is inserted. 1346 1347 This routine checks the state of the floppy and if media is inserted. 1348 There are 3 cases: 1349 No floppy present - Set BBS entry to ignore 1350 Floppy present & no media - Set BBS entry to lowest priority. We cannot 1351 set it to ignore since 16-bit CSM will 1352 indicate no floppy and thus drive A: is 1353 unusable. CSM-16 will not try floppy since 1354 lowest priority and thus not incur boot 1355 time penality. 1356 Floppy present & media - Set BBS entry to some priority. 1357 1358 @return State of floppy media 1359 1360 **/ 1361 UINT8 1362 HasMediaInFloppy ( 1363 VOID 1364 ); 1365 1366 /** 1367 Identify drive data must be updated to actual parameters before boot. 1368 This requires updating the checksum, if it exists. 1369 1370 @param IdentifyDriveData ATA Identify Data 1371 @param Checksum checksum of the ATA Identify Data 1372 1373 @retval EFI_SUCCESS checksum calculated 1374 @retval EFI_SECURITY_VIOLATION IdentifyData invalid 1375 1376 **/ 1377 EFI_STATUS 1378 CalculateIdentifyDriveChecksum ( 1379 IN UINT8 *IdentifyDriveData, 1380 OUT UINT8 *Checksum 1381 ); 1382 1383 /** 1384 Identify drive data must be updated to actual parameters before boot. 1385 1386 @param IdentifyDriveData ATA Identify Data 1387 1388 **/ 1389 VOID 1390 UpdateIdentifyDriveData ( 1391 IN UINT8 *IdentifyDriveData 1392 ); 1393 1394 /** 1395 Complete build of BBS TABLE. 1396 1397 @param Private Legacy BIOS Instance data 1398 @param BbsTable BBS Table passed to 16-bit code 1399 1400 @retval EFI_SUCCESS Removable media not present 1401 1402 **/ 1403 EFI_STATUS 1404 LegacyBiosBuildBbs ( 1405 IN LEGACY_BIOS_INSTANCE *Private, 1406 IN BBS_TABLE *BbsTable 1407 ); 1408 1409 /** 1410 Read CMOS register through index/data port. 1411 1412 @param[in] Index The index of the CMOS register to read. 1413 1414 @return The data value from the CMOS register specified by Index. 1415 1416 **/ 1417 UINT8 1418 LegacyReadStandardCmos ( 1419 IN UINT8 Index 1420 ); 1421 1422 /** 1423 Write CMOS register through index/data port. 1424 1425 @param[in] Index The index of the CMOS register to write. 1426 @param[in] Value The value of CMOS register to write. 1427 1428 @return The value written to the CMOS register specified by Index. 1429 1430 **/ 1431 UINT8 1432 LegacyWriteStandardCmos ( 1433 IN UINT8 Index, 1434 IN UINT8 Value 1435 ); 1436 1437 /** 1438 Calculate the new standard CMOS checksum and write it. 1439 1440 @param Private Legacy BIOS Instance data 1441 1442 @retval EFI_SUCCESS Calculate 16-bit checksum successfully 1443 1444 **/ 1445 EFI_STATUS 1446 LegacyCalculateWriteStandardCmosChecksum ( 1447 VOID 1448 ); 1449 1450 /** 1451 Test to see if a legacy PCI ROM exists for this device. Optionally return 1452 the Legacy ROM instance for this PCI device. 1453 1454 @param[in] This Protocol instance pointer. 1455 @param[in] PciHandle The PCI PC-AT OPROM from this devices ROM BAR will be loaded 1456 @param[out] RomImage Return the legacy PCI ROM for this device 1457 @param[out] RomSize Size of ROM Image 1458 @param[out] RuntimeImageLength Runtime size of ROM Image 1459 @param[out] Flags Indicates if ROM found and if PC-AT. 1460 @param[out] OpromRevision Revision of the PCI Rom 1461 @param[out] ConfigUtilityCodeHeaderPointer of Configuration Utility Code Header 1462 1463 @return EFI_SUCCESS Legacy Option ROM availible for this device 1464 @return EFI_ALREADY_STARTED This device is already managed by its Oprom 1465 @return EFI_UNSUPPORTED Legacy Option ROM not supported. 1466 1467 **/ 1468 EFI_STATUS 1469 LegacyBiosCheckPciRomEx ( 1470 IN EFI_LEGACY_BIOS_PROTOCOL *This, 1471 IN EFI_HANDLE PciHandle, 1472 OUT VOID **RomImage, OPTIONAL 1473 OUT UINTN *RomSize, OPTIONAL 1474 OUT UINTN *RuntimeImageLength, OPTIONAL 1475 OUT UINTN *Flags, OPTIONAL 1476 OUT UINT8 *OpromRevision, OPTIONAL 1477 OUT VOID **ConfigUtilityCodeHeader OPTIONAL 1478 ); 1479 1480 /** 1481 Relocate this image under 4G memory for IPF. 1482 1483 @param ImageHandle Handle of driver image. 1484 @param SystemTable Pointer to system table. 1485 1486 @retval EFI_SUCCESS Image successfully relocated. 1487 @retval EFI_ABORTED Failed to relocate image. 1488 1489 **/ 1490 EFI_STATUS 1491 RelocateImageUnder4GIfNeeded ( 1492 IN EFI_HANDLE ImageHandle, 1493 IN EFI_SYSTEM_TABLE *SystemTable 1494 ); 1495 1496 /** 1497 Thunk to 16-bit real mode and call Segment:Offset. Regs will contain the 1498 16-bit register context on entry and exit. Arguments can be passed on 1499 the Stack argument 1500 1501 @param This Protocol instance pointer. 1502 @param Segment Segemnt of 16-bit mode call 1503 @param Offset Offset of 16-bit mdoe call 1504 @param Regs Register contexted passed into (and returned) from thunk to 1505 16-bit mode 1506 @param Stack Caller allocated stack used to pass arguments 1507 @param StackSize Size of Stack in bytes 1508 1509 @retval FALSE Thunk completed, and there were no BIOS errors in the target code. 1510 See Regs for status. 1511 @retval TRUE There was a BIOS erro in the target code. 1512 1513 **/ 1514 BOOLEAN 1515 EFIAPI 1516 InternalLegacyBiosFarCall ( 1517 IN EFI_LEGACY_BIOS_PROTOCOL *This, 1518 IN UINT16 Segment, 1519 IN UINT16 Offset, 1520 IN EFI_IA32_REGISTER_SET *Regs, 1521 IN VOID *Stack, 1522 IN UINTN StackSize 1523 ); 1524 1525 /** 1526 Load a legacy PC-AT OpROM for VGA controller. 1527 1528 @param Private Driver private data. 1529 1530 @retval EFI_SUCCESS Legacy ROM successfully installed for this device. 1531 @retval EFI_DEVICE_ERROR No VGA device handle found, or native EFI video 1532 driver cannot be successfully disconnected, or VGA 1533 thunk driver cannot be successfully connected. 1534 1535 **/ 1536 EFI_STATUS 1537 LegacyBiosInstallVgaRom ( 1538 IN LEGACY_BIOS_INSTANCE *Private 1539 ); 1540 1541 #endif 1542
