diff options
Diffstat (limited to 'OvmfPkg/Csm/LegacyBiosDxe/LegacyBiosInterface.h')
| -rw-r--r-- | OvmfPkg/Csm/LegacyBiosDxe/LegacyBiosInterface.h | 1460 |
1 files changed, 1460 insertions, 0 deletions
diff --git a/OvmfPkg/Csm/LegacyBiosDxe/LegacyBiosInterface.h b/OvmfPkg/Csm/LegacyBiosDxe/LegacyBiosInterface.h new file mode 100644 index 0000000..a72c847 --- /dev/null +++ b/OvmfPkg/Csm/LegacyBiosDxe/LegacyBiosInterface.h @@ -0,0 +1,1460 @@ +/** @file
+
+Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
+
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef _LEGACY_BIOS_INTERFACE_
+#define _LEGACY_BIOS_INTERFACE_
+
+
+#include <FrameworkDxe.h>
+#include <IndustryStandard/Pci.h>
+#include <IndustryStandard/SmBios.h>
+#include <IndustryStandard/Acpi10.h>
+
+#include <Guid/SmBios.h>
+#include <Guid/Acpi.h>
+#include <Guid/DxeServices.h>
+#include <Guid/LegacyBios.h>
+#include <Guid/StatusCodeDataTypeId.h>
+#include <Guid/ImageAuthentication.h>
+
+#include <Protocol/BlockIo.h>
+#include <Protocol/LoadedImage.h>
+#include <Protocol/PciIo.h>
+#include <Protocol/Cpu.h>
+#include <Protocol/Timer.h>
+#include <Protocol/IsaIo.h>
+#include <Protocol/LegacyRegion2.h>
+#include <Protocol/SimpleTextIn.h>
+#include <Protocol/LegacyInterrupt.h>
+#include <Protocol/LegacyBios.h>
+#include <Protocol/DiskInfo.h>
+#include <Protocol/GenericMemoryTest.h>
+#include <Protocol/LegacyBiosPlatform.h>
+#include <Protocol/DevicePath.h>
+#include <Protocol/Legacy8259.h>
+#include <Protocol/PciRootBridgeIo.h>
+#include <Protocol/SerialIo.h>
+#include <Protocol/SuperIo.h>
+#include <Protocol/IoMmu.h>
+
+#include <Library/BaseLib.h>
+#include <Library/DebugLib.h>
+#include <Library/UefiLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/ReportStatusCodeLib.h>
+#include <Library/UefiRuntimeServicesTableLib.h>
+#include <Library/HobLib.h>
+#include <Library/UefiDriverEntryPoint.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/IoLib.h>
+#include <Library/PcdLib.h>
+#include <Library/DevicePathLib.h>
+#include <Library/DxeServicesTableLib.h>
+#include <Library/DebugAgentLib.h>
+
+//
+// BUGBUG: This entry maybe changed to PCD in future and wait for
+// redesign of BDS library
+//
+#define MAX_BBS_ENTRIES 0x100
+
+//
+// Thunk Status Codes
+// (These apply only to errors with the thunk and not to the code that was
+// thunked to.)
+//
+#define THUNK_OK 0x00
+#define THUNK_ERR_A20_UNSUP 0x01
+#define THUNK_ERR_A20_FAILED 0x02
+
+//
+// Vector base definitions
+//
+//
+// 8259 Hardware definitions
+//
+#define LEGACY_MODE_BASE_VECTOR_MASTER 0x08
+#define LEGACY_MODE_BASE_VECTOR_SLAVE 0x70
+
+//
+// The original PC used INT8-F for master PIC. Since these mapped over
+// processor exceptions TIANO moved the master PIC to INT68-6F.
+//
+// The vector base for slave PIC is set as 0x70 for PC-AT compatibility.
+//
+#define PROTECTED_MODE_BASE_VECTOR_MASTER 0x68
+#define PROTECTED_MODE_BASE_VECTOR_SLAVE 0x70
+
+//
+// When we call CSM16 functions, some CSM16 use es:[offset + 0xabcd] to get data passed from CSM32,
+// offset + 0xabcd could overflow which exceeds 0xFFFF which is invalid in real mode.
+// So this will keep offset as small as possible to avoid offset overflow in real mode.
+//
+#define NORMALIZE_EFI_SEGMENT(_Adr) (UINT16) (((UINTN) (_Adr)) >> 4)
+#define NORMALIZE_EFI_OFFSET(_Adr) (UINT16) (((UINT16) ((UINTN) (_Adr))) & 0xf)
+
+//
+// Trace defines
+//
+//
+#define LEGACY_BDA_TRACE 0x000
+#define LEGACY_BIOS_TRACE 0x040
+#define LEGACY_BOOT_TRACE 0x080
+#define LEGACY_CMOS_TRACE 0x0C0
+#define LEGACY_IDE_TRACE 0x100
+#define LEGACY_MP_TRACE 0x140
+#define LEGACY_PCI_TRACE 0x180
+#define LEGACY_SIO_TRACE 0x1C0
+
+#define LEGACY_PCI_TRACE_000 LEGACY_PCI_TRACE + 0x00
+#define LEGACY_PCI_TRACE_001 LEGACY_PCI_TRACE + 0x01
+#define LEGACY_PCI_TRACE_002 LEGACY_PCI_TRACE + 0x02
+#define LEGACY_PCI_TRACE_003 LEGACY_PCI_TRACE + 0x03
+#define LEGACY_PCI_TRACE_004 LEGACY_PCI_TRACE + 0x04
+#define LEGACY_PCI_TRACE_005 LEGACY_PCI_TRACE + 0x05
+#define LEGACY_PCI_TRACE_006 LEGACY_PCI_TRACE + 0x06
+#define LEGACY_PCI_TRACE_007 LEGACY_PCI_TRACE + 0x07
+#define LEGACY_PCI_TRACE_008 LEGACY_PCI_TRACE + 0x08
+#define LEGACY_PCI_TRACE_009 LEGACY_PCI_TRACE + 0x09
+#define LEGACY_PCI_TRACE_00A LEGACY_PCI_TRACE + 0x0A
+#define LEGACY_PCI_TRACE_00B LEGACY_PCI_TRACE + 0x0B
+#define LEGACY_PCI_TRACE_00C LEGACY_PCI_TRACE + 0x0C
+#define LEGACY_PCI_TRACE_00D LEGACY_PCI_TRACE + 0x0D
+#define LEGACY_PCI_TRACE_00E LEGACY_PCI_TRACE + 0x0E
+#define LEGACY_PCI_TRACE_00F LEGACY_PCI_TRACE + 0x0F
+
+#define BDA_VIDEO_MODE 0x49
+
+#define IDE_PI_REGISTER_PNE BIT0
+#define IDE_PI_REGISTER_SNE BIT2
+
+typedef struct {
+ UINTN PciSegment;
+ UINTN PciBus;
+ UINTN PciDevice;
+ UINTN PciFunction;
+ UINT32 ShadowAddress;
+ UINT32 ShadowedSize;
+ UINT8 DiskStart;
+ UINT8 DiskEnd;
+} ROM_INSTANCE_ENTRY;
+
+//
+// Values for RealModeGdt
+//
+#if defined (MDE_CPU_IA32)
+
+#define NUM_REAL_GDT_ENTRIES 3
+#define CONVENTIONAL_MEMORY_TOP 0xA0000 // 640 KB
+#define INITIAL_VALUE_BELOW_1K 0x0
+
+#elif defined (MDE_CPU_X64)
+
+#define NUM_REAL_GDT_ENTRIES 8
+#define CONVENTIONAL_MEMORY_TOP 0xA0000 // 640 KB
+#define INITIAL_VALUE_BELOW_1K 0x0
+
+#endif
+
+#pragma pack(1)
+
+//
+// Define what a processor GDT looks like
+//
+typedef struct {
+ UINT32 LimitLo : 16;
+ UINT32 BaseLo : 16;
+ UINT32 BaseMid : 8;
+ UINT32 Type : 4;
+ UINT32 System : 1;
+ UINT32 Dpl : 2;
+ UINT32 Present : 1;
+ UINT32 LimitHi : 4;
+ UINT32 Software : 1;
+ UINT32 Reserved : 1;
+ UINT32 DefaultSize : 1;
+ UINT32 Granularity : 1;
+ UINT32 BaseHi : 8;
+} GDT32;
+
+typedef struct {
+ UINT16 LimitLow;
+ UINT16 BaseLow;
+ UINT8 BaseMid;
+ UINT8 Attribute;
+ UINT8 LimitHi;
+ UINT8 BaseHi;
+} GDT64;
+
+//
+// Define what a processor descriptor looks like
+// This data structure must be kept in sync with ASM STRUCT in Thunk.inc
+//
+typedef struct {
+ UINT16 Limit;
+ UINT64 Base;
+} DESCRIPTOR64;
+
+typedef struct {
+ UINT16 Limit;
+ UINT32 Base;
+} DESCRIPTOR32;
+
+//
+// Low stub lay out
+//
+#define LOW_STACK_SIZE (8 * 1024) // 8k?
+#define EFI_MAX_E820_ENTRY 100
+#define FIRST_INSTANCE 1
+#define NOT_FIRST_INSTANCE 0
+
+#if defined (MDE_CPU_IA32)
+typedef struct {
+ //
+ // Space for the code
+ // The address of Code is also the beginning of the relocated Thunk code
+ //
+ CHAR8 Code[4096]; // ?
+ //
+ // The address of the Reverse Thunk code
+ // Note that this member CONTAINS the address of the relocated reverse thunk
+ // code unlike the member variable 'Code', which IS the address of the Thunk
+ // code.
+ //
+ UINT32 LowReverseThunkStart;
+
+ //
+ // Data for the code (cs releative)
+ //
+ DESCRIPTOR32 GdtDesc; // Protected mode GDT
+ DESCRIPTOR32 IdtDesc; // Protected mode IDT
+ UINT32 FlatSs;
+ UINT32 FlatEsp;
+
+ UINT32 LowCodeSelector; // Low code selector in GDT
+ UINT32 LowDataSelector; // Low data selector in GDT
+ UINT32 LowStack;
+ DESCRIPTOR32 RealModeIdtDesc;
+
+ //
+ // real-mode GDT (temporary GDT with two real mode segment descriptors)
+ //
+ GDT32 RealModeGdt[NUM_REAL_GDT_ENTRIES];
+ DESCRIPTOR32 RealModeGdtDesc;
+
+ //
+ // Members specifically for the reverse thunk
+ // The RevReal* members are used to store the current state of real mode
+ // before performing the reverse thunk. The RevFlat* members must be set
+ // before calling the reverse thunk assembly code.
+ //
+ UINT16 RevRealDs;
+ UINT16 RevRealSs;
+ UINT32 RevRealEsp;
+ DESCRIPTOR32 RevRealIdtDesc;
+ UINT16 RevFlatDataSelector; // Flat data selector in GDT
+ UINT32 RevFlatStack;
+
+ //
+ // A low memory stack
+ //
+ CHAR8 Stack[LOW_STACK_SIZE];
+
+ //
+ // Stack for flat mode after reverse thunk
+ // @bug - This may no longer be necessary if the reverse thunk interface
+ // is changed to have the flat stack in a different location.
+ //
+ CHAR8 RevThunkStack[LOW_STACK_SIZE];
+
+ //
+ // Legacy16 Init memory map info
+ //
+ EFI_TO_COMPATIBILITY16_INIT_TABLE EfiToLegacy16InitTable;
+
+ EFI_TO_COMPATIBILITY16_BOOT_TABLE EfiToLegacy16BootTable;
+
+ CHAR8 InterruptRedirectionCode[32];
+ EFI_LEGACY_INSTALL_PCI_HANDLER PciHandler;
+ EFI_DISPATCH_OPROM_TABLE DispatchOpromTable;
+ BBS_TABLE BbsTable[MAX_BBS_ENTRIES];
+} LOW_MEMORY_THUNK;
+
+#elif defined (MDE_CPU_X64)
+
+typedef struct {
+ //
+ // Space for the code
+ // The address of Code is also the beginning of the relocated Thunk code
+ //
+ CHAR8 Code[4096]; // ?
+
+ //
+ // Data for the code (cs releative)
+ //
+ DESCRIPTOR64 X64GdtDesc; // Protected mode GDT
+ DESCRIPTOR64 X64IdtDesc; // Protected mode IDT
+ UINTN X64Ss;
+ UINTN X64Esp;
+
+ UINTN RealStack;
+ DESCRIPTOR32 RealModeIdtDesc;
+ DESCRIPTOR32 RealModeGdtDesc;
+
+ //
+ // real-mode GDT (temporary GDT with two real mode segment descriptors)
+ //
+ GDT64 RealModeGdt[NUM_REAL_GDT_ENTRIES];
+ UINT64 PageMapLevel4;
+
+ //
+ // A low memory stack
+ //
+ CHAR8 Stack[LOW_STACK_SIZE];
+
+ //
+ // Legacy16 Init memory map info
+ //
+ EFI_TO_COMPATIBILITY16_INIT_TABLE EfiToLegacy16InitTable;
+
+ EFI_TO_COMPATIBILITY16_BOOT_TABLE EfiToLegacy16BootTable;
+
+ CHAR8 InterruptRedirectionCode[32];
+ EFI_LEGACY_INSTALL_PCI_HANDLER PciHandler;
+ EFI_DISPATCH_OPROM_TABLE DispatchOpromTable;
+ BBS_TABLE BbsTable[MAX_BBS_ENTRIES];
+} LOW_MEMORY_THUNK;
+
+#endif
+
+//
+// PnP Expansion Header
+//
+typedef struct {
+ UINT32 PnpSignature;
+ UINT8 Revision;
+ UINT8 Length;
+ UINT16 NextHeader;
+ UINT8 Reserved1;
+ UINT8 Checksum;
+ UINT32 DeviceId;
+ UINT16 MfgPointer;
+ UINT16 ProductNamePointer;
+ UINT8 Class;
+ UINT8 SubClass;
+ UINT8 Interface;
+ UINT8 DeviceIndicators;
+ UINT16 Bcv;
+ UINT16 DisconnectVector;
+ UINT16 Bev;
+ UINT16 Reserved2;
+ UINT16 StaticResourceVector;
+} LEGACY_PNP_EXPANSION_HEADER;
+
+typedef struct {
+ UINT8 PciSegment;
+ UINT8 PciBus;
+ UINT8 PciDevice;
+ UINT8 PciFunction;
+ UINT16 Vid;
+ UINT16 Did;
+ UINT16 SysSid;
+ UINT16 SVid;
+ UINT8 Class;
+ UINT8 SubClass;
+ UINT8 Interface;
+ UINT8 Reserved;
+ UINTN RomStart;
+ UINTN ManufacturerString;
+ UINTN ProductNameString;
+} LEGACY_ROM_AND_BBS_TABLE;
+
+//
+// Structure how EFI has mapped a devices HDD drive numbers.
+// Boot to EFI aware OS or shell requires this mapping when
+// 16-bit CSM assigns drive numbers.
+// This mapping is ignored booting to a legacy OS.
+//
+typedef struct {
+ UINT8 PciSegment;
+ UINT8 PciBus;
+ UINT8 PciDevice;
+ UINT8 PciFunction;
+ UINT8 StartDriveNumber;
+ UINT8 EndDriveNumber;
+} LEGACY_EFI_HDD_TABLE;
+
+//
+// This data is passed to Leacy16Boot
+//
+typedef enum {
+ EfiAcpiAddressRangeMemory = 1,
+ EfiAcpiAddressRangeReserved = 2,
+ EfiAcpiAddressRangeACPI = 3,
+ EfiAcpiAddressRangeNVS = 4,
+ EfiAddressRangePersistentMemory = 7
+} EFI_ACPI_MEMORY_TYPE;
+
+typedef struct {
+ UINT64 BaseAddr;
+ UINT64 Length;
+ EFI_ACPI_MEMORY_TYPE Type;
+} EFI_E820_ENTRY64;
+
+typedef struct {
+ UINT32 BassAddrLow;
+ UINT32 BaseAddrHigh;
+ UINT32 LengthLow;
+ UINT32 LengthHigh;
+ EFI_ACPI_MEMORY_TYPE Type;
+} EFI_E820_ENTRY;
+
+#pragma pack()
+
+extern BBS_TABLE *mBbsTable;
+
+extern EFI_GENERIC_MEMORY_TEST_PROTOCOL *gGenMemoryTest;
+
+extern BOOLEAN mEndOfDxe;
+
+#define PORT_70 0x70
+#define PORT_71 0x71
+
+#define CMOS_0A 0x0a ///< Status register A
+#define CMOS_0D 0x0d ///< Status register D
+#define CMOS_0E 0x0e ///< Diagnostic Status
+#define CMOS_0F 0x0f ///< Shutdown status
+#define CMOS_10 0x10 ///< Floppy type
+#define CMOS_12 0x12 ///< IDE type
+#define CMOS_14 0x14 ///< Same as BDA 40:10
+#define CMOS_15 0x15 ///< Low byte of base memory in 1k increments
+#define CMOS_16 0x16 ///< High byte of base memory in 1k increments
+#define CMOS_17 0x17 ///< Low byte of 1MB+ memory in 1k increments - max 15 MB
+#define CMOS_18 0x18 ///< High byte of 1MB+ memory in 1k increments - max 15 MB
+#define CMOS_19 0x19 ///< C: extended drive type
+#define CMOS_1A 0x1a ///< D: extended drive type
+#define CMOS_2E 0x2e ///< Most significient byte of standard checksum
+#define CMOS_2F 0x2f ///< Least significient byte of standard checksum
+#define CMOS_30 0x30 ///< CMOS 0x17
+#define CMOS_31 0x31 ///< CMOS 0x18
+#define CMOS_32 0x32 ///< Century byte
+
+//
+// 8254 Timer registers
+//
+#define TIMER0_COUNT_PORT 0x40
+#define TIMER1_COUNT_PORT 0x41
+#define TIMER2_COUNT_PORT 0x42
+#define TIMER_CONTROL_PORT 0x43
+
+//
+// Timer 0, Read/Write LSB then MSB, Square wave output, binary count use.
+//
+#define TIMER0_CONTROL_WORD 0x36
+
+#define LEGACY_BIOS_INSTANCE_SIGNATURE SIGNATURE_32 ('L', 'B', 'I', 'T')
+typedef struct {
+ UINTN Signature;
+
+ EFI_HANDLE Handle;
+ EFI_LEGACY_BIOS_PROTOCOL LegacyBios;
+
+ EFI_HANDLE ImageHandle;
+
+ //
+ // CPU Architectural Protocol
+ //
+ EFI_CPU_ARCH_PROTOCOL *Cpu;
+
+ //
+ // Timer Architectural Protocol
+ //
+ EFI_TIMER_ARCH_PROTOCOL *Timer;
+ BOOLEAN TimerUses8254;
+
+ //
+ // Protocol to Lock and Unlock 0xc0000 - 0xfffff
+ //
+ EFI_LEGACY_REGION2_PROTOCOL *LegacyRegion;
+
+ EFI_LEGACY_BIOS_PLATFORM_PROTOCOL *LegacyBiosPlatform;
+
+ //
+ // Interrupt control for thunk and PCI IRQ
+ //
+ EFI_LEGACY_8259_PROTOCOL *Legacy8259;
+
+ //
+ // PCI Interrupt PIRQ control
+ //
+ EFI_LEGACY_INTERRUPT_PROTOCOL *LegacyInterrupt;
+
+ //
+ // Generic Memory Test
+ //
+ EFI_GENERIC_MEMORY_TEST_PROTOCOL *GenericMemoryTest;
+
+ //
+ // TRUE if PCI Interupt Line registers have been programmed.
+ //
+ BOOLEAN PciInterruptLine;
+
+ //
+ // Code space below 1MB needed by thunker to transition to real mode.
+ // Contains stack and real mode code fragments
+ //
+ LOW_MEMORY_THUNK *IntThunk;
+
+ //
+ // Starting shadow address of the Legacy BIOS
+ //
+ UINT32 BiosStart;
+ UINT32 LegacyBiosImageSize;
+
+ //
+ // Start of variables used by CsmItp.mac ITP macro file and/os LegacyBios
+ //
+ UINT8 Dump[4];
+
+ //
+ // $EFI Legacy16 code entry info in memory < 1 MB;
+ //
+ EFI_COMPATIBILITY16_TABLE *Legacy16Table;
+ VOID *Legacy16InitPtr;
+ VOID *Legacy16BootPtr;
+ VOID *InternalIrqRoutingTable;
+ UINT32 NumberIrqRoutingEntries;
+ VOID *BbsTablePtr;
+ VOID *HddTablePtr;
+ UINT32 NumberHddControllers;
+
+ //
+ // Cached copy of Legacy16 entry point
+ //
+ UINT16 Legacy16CallSegment;
+ UINT16 Legacy16CallOffset;
+
+ //
+ // Returned from $EFI and passed in to OPROMS
+ //
+ UINT16 PnPInstallationCheckSegment;
+ UINT16 PnPInstallationCheckOffset;
+
+ //
+ // E820 table
+ //
+ EFI_E820_ENTRY E820Table[EFI_MAX_E820_ENTRY];
+ UINT32 NumberE820Entries;
+
+ //
+ // True if legacy VGA INT 10h handler installed
+ //
+ BOOLEAN VgaInstalled;
+
+ //
+ // Number of IDE drives
+ //
+ UINT8 IdeDriveCount;
+
+ //
+ // Current Free Option ROM space. An option ROM must NOT go past
+ // BiosStart.
+ //
+ UINT32 OptionRom;
+
+ //
+ // Save Legacy16 unexpected interrupt vector. Reprogram INT 68-6F from
+ // EFI values to legacy value just before boot.
+ //
+ UINT32 BiosUnexpectedInt;
+ UINT32 ThunkSavedInt[8];
+ UINT16 ThunkSeg;
+ LEGACY_EFI_HDD_TABLE *LegacyEfiHddTable;
+ UINT16 LegacyEfiHddTableIndex;
+ UINT8 DiskEnd;
+ UINT8 Disk4075;
+ UINT16 TraceIndex;
+ UINT16 Trace[0x200];
+
+ //
+ // Indicate that whether GenericLegacyBoot is entered or not
+ //
+ BOOLEAN LegacyBootEntered;
+
+ //
+ // CSM16 PCI Interface Version
+ //
+ UINT16 Csm16PciInterfaceVersion;
+
+} LEGACY_BIOS_INSTANCE;
+
+
+#pragma pack(1)
+
+/*
+ 40:00-01 Com1
+ 40:02-03 Com2
+ 40:04-05 Com3
+ 40:06-07 Com4
+ 40:08-09 Lpt1
+ 40:0A-0B Lpt2
+ 40:0C-0D Lpt3
+ 40:0E-0E Ebda segment
+ 40:10-11 MachineConfig
+ 40:12 Bda12 - skip
+ 40:13-14 MemSize below 1MB
+ 40:15-16 Bda15_16 - skip
+ 40:17 Keyboard Shift status
+ 40:18-19 Bda18_19 - skip
+ 40:1A-1B Key buffer head
+ 40:1C-1D Key buffer tail
+ 40:1E-3D Bda1E_3D- key buffer -skip
+ 40:3E-3F FloppyData 3E = Calibration status 3F = Motor status
+ 40:40 FloppyTimeout
+ 40:41-74 Bda41_74 - skip
+ 40:75 Number of HDD drives
+ 40:76-77 Bda76_77 - skip
+ 40:78-79 78 = Lpt1 timeout, 79 = Lpt2 timeout
+ 40:7A-7B 7A = Lpt3 timeout, 7B = Lpt4 timeout
+ 40:7C-7D 7C = Com1 timeout, 7D = Com2 timeout
+ 40:7E-7F 7E = Com3 timeout, 7F = Com4 timeout
+ 40:80-81 Pointer to start of key buffer
+ 40:82-83 Pointer to end of key buffer
+ 40:84-87 Bda84_87 - skip
+ 40:88 HDD Data Xmit rate
+ 40:89-8f skip
+ 40:90 Floppy data rate
+ 40:91-95 skip
+ 40:96 Keyboard Status
+ 40:97 LED Status
+ 40:98-101 skip
+*/
+typedef struct {
+ UINT16 Com1;
+ UINT16 Com2;
+ UINT16 Com3;
+ UINT16 Com4;
+ UINT16 Lpt1;
+ UINT16 Lpt2;
+ UINT16 Lpt3;
+ UINT16 Ebda;
+ UINT16 MachineConfig;
+ UINT8 Bda12;
+ UINT16 MemSize;
+ UINT8 Bda15_16[0x02];
+ UINT8 ShiftStatus;
+ UINT8 Bda18_19[0x02];
+ UINT16 KeyHead;
+ UINT16 KeyTail;
+ UINT16 Bda1E_3D[0x10];
+ UINT16 FloppyData;
+ UINT8 FloppyTimeout;
+ UINT8 Bda41_74[0x34];
+ UINT8 NumberOfDrives;
+ UINT8 Bda76_77[0x02];
+ UINT16 Lpt1_2Timeout;
+ UINT16 Lpt3_4Timeout;
+ UINT16 Com1_2Timeout;
+ UINT16 Com3_4Timeout;
+ UINT16 KeyStart;
+ UINT16 KeyEnd;
+ UINT8 Bda84_87[0x4];
+ UINT8 DataXmit;
+ UINT8 Bda89_8F[0x07];
+ UINT8 FloppyXRate;
+ UINT8 Bda91_95[0x05];
+ UINT8 KeyboardStatus;
+ UINT8 LedStatus;
+} BDA_STRUC;
+#pragma pack()
+
+#define LEGACY_BIOS_INSTANCE_FROM_THIS(this) CR (this, LEGACY_BIOS_INSTANCE, LegacyBios, LEGACY_BIOS_INSTANCE_SIGNATURE)
+
+/**
+ Thunk to 16-bit real mode and execute a software interrupt with a vector
+ of BiosInt. Regs will contain the 16-bit register context on entry and
+ exit.
+
+ @param This Protocol instance pointer.
+ @param BiosInt Processor interrupt vector to invoke
+ @param Regs Register contexted passed into (and returned) from thunk to
+ 16-bit mode
+
+ @retval FALSE Thunk completed, and there were no BIOS errors in the target code.
+ See Regs for status.
+ @retval TRUE There was a BIOS erro in the target code.
+
+**/
+BOOLEAN
+EFIAPI
+LegacyBiosInt86 (
+ IN EFI_LEGACY_BIOS_PROTOCOL *This,
+ IN UINT8 BiosInt,
+ IN EFI_IA32_REGISTER_SET *Regs
+ );
+
+
+/**
+ Thunk to 16-bit real mode and call Segment:Offset. Regs will contain the
+ 16-bit register context on entry and exit. Arguments can be passed on
+ the Stack argument
+
+ @param This Protocol instance pointer.
+ @param Segment Segemnt of 16-bit mode call
+ @param Offset Offset of 16-bit mdoe call
+ @param Regs Register contexted passed into (and returned) from
+ thunk to 16-bit mode
+ @param Stack Caller allocated stack used to pass arguments
+ @param StackSize Size of Stack in bytes
+
+ @retval FALSE Thunk completed, and there were no BIOS errors in
+ the target code. See Regs for status.
+ @retval TRUE There was a BIOS erro in the target code.
+
+**/
+BOOLEAN
+EFIAPI
+LegacyBiosFarCall86 (
+ IN EFI_LEGACY_BIOS_PROTOCOL *This,
+ IN UINT16 Segment,
+ IN UINT16 Offset,
+ IN EFI_IA32_REGISTER_SET *Regs,
+ IN VOID *Stack,
+ IN UINTN StackSize
+ );
+
+
+/**
+ Test to see if a legacy PCI ROM exists for this device. Optionally return
+ the Legacy ROM instance for this PCI device.
+
+ @param This Protocol instance pointer.
+ @param PciHandle The PCI PC-AT OPROM from this devices ROM BAR will
+ be loaded
+ @param RomImage Return the legacy PCI ROM for this device
+ @param RomSize Size of ROM Image
+ @param Flags Indicates if ROM found and if PC-AT.
+
+ @retval EFI_SUCCESS Legacy Option ROM available for this device
+ @retval EFI_UNSUPPORTED Legacy Option ROM not supported.
+
+**/
+EFI_STATUS
+EFIAPI
+LegacyBiosCheckPciRom (
+ IN EFI_LEGACY_BIOS_PROTOCOL *This,
+ IN EFI_HANDLE PciHandle,
+ OUT VOID **RomImage, OPTIONAL
+ OUT UINTN *RomSize, OPTIONAL
+ OUT UINTN *Flags
+ );
+
+
+/**
+ Assign drive number to legacy HDD drives prior to booting an EFI
+ aware OS so the OS can access drives without an EFI driver.
+ Note: BBS compliant drives ARE NOT available until this call by
+ either shell or EFI.
+
+ @param This Protocol instance pointer.
+ @param BbsCount Number of BBS_TABLE structures
+ @param BbsTable List BBS entries
+
+ @retval EFI_SUCCESS Drive numbers assigned
+
+**/
+EFI_STATUS
+EFIAPI
+LegacyBiosPrepareToBootEfi (
+ IN EFI_LEGACY_BIOS_PROTOCOL *This,
+ OUT UINT16 *BbsCount,
+ OUT BBS_TABLE **BbsTable
+ );
+
+
+/**
+ To boot from an unconventional device like parties and/or execute
+ HDD diagnostics.
+
+ @param This Protocol instance pointer.
+ @param Attributes How to interpret the other input parameters
+ @param BbsEntry The 0-based index into the BbsTable for the parent
+ device.
+ @param BeerData Pointer to the 128 bytes of ram BEER data.
+ @param ServiceAreaData Pointer to the 64 bytes of raw Service Area data.
+ The caller must provide a pointer to the specific
+ Service Area and not the start all Service Areas.
+ EFI_INVALID_PARAMETER if error. Does NOT return if no error.
+
+**/
+EFI_STATUS
+EFIAPI
+LegacyBiosBootUnconventionalDevice (
+ IN EFI_LEGACY_BIOS_PROTOCOL *This,
+ IN UDC_ATTRIBUTES Attributes,
+ IN UINTN BbsEntry,
+ IN VOID *BeerData,
+ IN VOID *ServiceAreaData
+ );
+
+
+/**
+ Load a legacy PC-AT OPROM on the PciHandle device. Return information
+ about how many disks were added by the OPROM and the shadow address and
+ size. DiskStart & DiskEnd are INT 13h drive letters. Thus 0x80 is C:
+
+ @param This Protocol instance pointer.
+ @param PciHandle The PCI PC-AT OPROM from this devices ROM BAR will
+ be loaded. This value is NULL if RomImage is
+ non-NULL. This is the normal case.
+ @param RomImage A PCI PC-AT ROM image. This argument is non-NULL
+ if there is no hardware associated with the ROM
+ and thus no PciHandle, otherwise is must be NULL.
+ Example is PXE base code.
+ @param Flags Indicates if ROM found and if PC-AT.
+ @param DiskStart Disk number of first device hooked by the ROM. If
+ DiskStart is the same as DiskEnd no disked were
+ hooked.
+ @param DiskEnd Disk number of the last device hooked by the ROM.
+ @param RomShadowAddress Shadow address of PC-AT ROM
+ @param RomShadowedSize Size of RomShadowAddress in bytes
+
+ @retval EFI_SUCCESS Legacy ROM loaded for this device
+ @retval EFI_INVALID_PARAMETER PciHandle not found
+ @retval EFI_UNSUPPORTED There is no PCI ROM in the ROM BAR or no onboard
+ ROM
+
+**/
+EFI_STATUS
+EFIAPI
+LegacyBiosInstallPciRom (
+ IN EFI_LEGACY_BIOS_PROTOCOL * This,
+ IN EFI_HANDLE PciHandle,
+ IN VOID **RomImage,
+ OUT UINTN *Flags,
+ OUT UINT8 *DiskStart, OPTIONAL
+ OUT UINT8 *DiskEnd, OPTIONAL
+ OUT VOID **RomShadowAddress, OPTIONAL
+ OUT UINT32 *RomShadowedSize OPTIONAL
+ );
+
+
+/**
+ Fill in the standard BDA for Keyboard LEDs
+
+ @param This Protocol instance pointer.
+ @param Leds Current LED status
+
+ @retval EFI_SUCCESS It should always work.
+
+**/
+EFI_STATUS
+EFIAPI
+LegacyBiosUpdateKeyboardLedStatus (
+ IN EFI_LEGACY_BIOS_PROTOCOL *This,
+ IN UINT8 Leds
+ );
+
+
+/**
+ Get all BBS info
+
+ @param This Protocol instance pointer.
+ @param HddCount Number of HDD_INFO structures
+ @param HddInfo Onboard IDE controller information
+ @param BbsCount Number of BBS_TABLE structures
+ @param BbsTable List BBS entries
+
+ @retval EFI_SUCCESS Tables returned
+ @retval EFI_NOT_FOUND resource not found
+ @retval EFI_DEVICE_ERROR can not get BBS table
+
+**/
+EFI_STATUS
+EFIAPI
+LegacyBiosGetBbsInfo (
+ IN EFI_LEGACY_BIOS_PROTOCOL *This,
+ OUT UINT16 *HddCount,
+ OUT HDD_INFO **HddInfo,
+ OUT UINT16 *BbsCount,
+ OUT BBS_TABLE **BbsTable
+ );
+
+
+/**
+ Shadow all legacy16 OPROMs that haven't been shadowed.
+ Warning: Use this with caution. This routine disconnects all EFI
+ drivers. If used externally then caller must re-connect EFI
+ drivers.
+
+ @param This Protocol instance pointer.
+
+ @retval EFI_SUCCESS OPROMs shadowed
+
+**/
+EFI_STATUS
+EFIAPI
+LegacyBiosShadowAllLegacyOproms (
+ IN EFI_LEGACY_BIOS_PROTOCOL *This
+ );
+
+
+/**
+ Attempt to legacy boot the BootOption. If the EFI contexted has been
+ compromised this function will not return.
+
+ @param This Protocol instance pointer.
+ @param BbsDevicePath EFI Device Path from BootXXXX variable.
+ @param LoadOptionsSize Size of LoadOption in size.
+ @param LoadOptions LoadOption from BootXXXX variable
+
+ @retval EFI_SUCCESS Removable media not present
+
+**/
+EFI_STATUS
+EFIAPI
+LegacyBiosLegacyBoot (
+ IN EFI_LEGACY_BIOS_PROTOCOL *This,
+ IN BBS_BBS_DEVICE_PATH *BbsDevicePath,
+ IN UINT32 LoadOptionsSize,
+ IN VOID *LoadOptions
+ );
+
+
+/**
+ Allocate memory < 1 MB and copy the thunker code into low memory. Se up
+ all the descriptors.
+
+ @param Private Private context for Legacy BIOS
+
+ @retval EFI_SUCCESS Should only pass.
+
+**/
+EFI_STATUS
+LegacyBiosInitializeThunk (
+ IN LEGACY_BIOS_INSTANCE *Private
+ );
+
+
+/**
+ Fill in the standard BDA and EBDA stuff before Legacy16 load
+
+ @param Private Legacy BIOS Instance data
+
+ @retval EFI_SUCCESS It should always work.
+
+**/
+EFI_STATUS
+LegacyBiosInitBda (
+ IN LEGACY_BIOS_INSTANCE *Private
+ );
+
+
+/**
+ Collect IDE Inquiry data from the IDE disks
+
+ @param Private Legacy BIOS Instance data
+ @param HddInfo Hdd Information
+ @param Flag Reconnect IdeController or not
+
+ @retval EFI_SUCCESS It should always work.
+
+**/
+EFI_STATUS
+LegacyBiosBuildIdeData (
+ IN LEGACY_BIOS_INSTANCE *Private,
+ IN HDD_INFO **HddInfo,
+ IN UINT16 Flag
+ );
+
+
+/**
+ Enable ide controller. This gets disabled when LegacyBoot.c is about
+ to run the Option ROMs.
+
+ @param Private Legacy BIOS Instance data
+
+
+**/
+VOID
+EnableIdeController (
+ IN LEGACY_BIOS_INSTANCE *Private
+ );
+
+
+/**
+ If the IDE channel is in compatibility (legacy) mode, remove all
+ PCI I/O BAR addresses from the controller.
+
+ @param IdeController The handle of target IDE controller
+
+
+**/
+VOID
+InitLegacyIdeController (
+ IN EFI_HANDLE IdeController
+ );
+
+
+/**
+ Program the interrupt routing register in all the PCI devices. On a PC AT system
+ this register contains the 8259 IRQ vector that matches it's PCI interrupt.
+
+ @param Private Legacy BIOS Instance data
+
+ @retval EFI_SUCCESS Succeed.
+ @retval EFI_ALREADY_STARTED All PCI devices have been processed.
+
+**/
+EFI_STATUS
+PciProgramAllInterruptLineRegisters (
+ IN LEGACY_BIOS_INSTANCE *Private
+ );
+
+
+/**
+ Collect EFI Info about legacy devices.
+
+ @param Private Legacy BIOS Instance data
+
+ @retval EFI_SUCCESS It should always work.
+
+**/
+EFI_STATUS
+LegacyBiosBuildSioData (
+ IN LEGACY_BIOS_INSTANCE *Private
+ );
+
+
+/**
+ Shadow all the PCI legacy ROMs. Use data from the Legacy BIOS Protocol
+ to chose the order. Skip any devices that have already have legacy
+ BIOS run.
+
+ @param Private Protocol instance pointer.
+
+ @retval EFI_SUCCESS Succeed.
+ @retval EFI_UNSUPPORTED Cannot get VGA device handle.
+
+**/
+EFI_STATUS
+PciShadowRoms (
+ IN LEGACY_BIOS_INSTANCE *Private
+ );
+
+
+/**
+ Fill in the standard BDA and EBDA stuff prior to legacy Boot
+
+ @param Private Legacy BIOS Instance data
+
+ @retval EFI_SUCCESS It should always work.
+
+**/
+EFI_STATUS
+LegacyBiosCompleteBdaBeforeBoot (
+ IN LEGACY_BIOS_INSTANCE *Private
+ );
+
+
+/**
+ Fill in the standard CMOS stuff before Legacy16 load
+
+ @param Private Legacy BIOS Instance data
+
+ @retval EFI_SUCCESS It should always work.
+
+**/
+EFI_STATUS
+LegacyBiosInitCmos (
+ IN LEGACY_BIOS_INSTANCE *Private
+ );
+
+
+/**
+ Fill in the standard CMOS stuff prior to legacy Boot
+
+ @param Private Legacy BIOS Instance data
+
+ @retval EFI_SUCCESS It should always work.
+
+**/
+EFI_STATUS
+LegacyBiosCompleteStandardCmosBeforeBoot (
+ IN LEGACY_BIOS_INSTANCE *Private
+ );
+
+
+/**
+ Contains the code that is copied into low memory (below 640K).
+ This code reflects interrupts 0x68-0x6f to interrupts 0x08-0x0f.
+ This template must be copied into low memory, and the IDT entries
+ 0x68-0x6F must be point to the low memory copy of this code. Each
+ entry is 4 bytes long, so IDT entries 0x68-0x6F can be easily
+ computed.
+
+**/
+VOID
+InterruptRedirectionTemplate (
+ VOID
+ );
+
+
+/**
+ Build the E820 table.
+
+ @param Private Legacy BIOS Instance data
+ @param Size Size of E820 Table
+
+ @retval EFI_SUCCESS It should always work.
+
+**/
+EFI_STATUS
+LegacyBiosBuildE820 (
+ IN LEGACY_BIOS_INSTANCE *Private,
+ OUT UINTN *Size
+ );
+
+/**
+ This function is to put all AP in halt state.
+
+ @param Private Legacy BIOS Instance data
+
+**/
+VOID
+ShutdownAPs (
+ IN LEGACY_BIOS_INSTANCE *Private
+ );
+
+/**
+ Worker function for LegacyBiosGetFlatDescs, retrieving content of
+ specific registers.
+
+ @param IntThunk Pointer to IntThunk of Legacy BIOS context.
+
+**/
+VOID
+GetRegisters (
+ LOW_MEMORY_THUNK *IntThunk
+ );
+
+/**
+ Routine for calling real thunk code.
+
+ @param RealCode The address of thunk code.
+ @param BiosInt The Bios interrupt vector number.
+ @param CallAddress The address of 16-bit mode call.
+
+ @return Status returned by real thunk code
+
+**/
+UINTN
+CallRealThunkCode (
+ UINT8 *RealCode,
+ UINT8 BiosInt,
+ UINT32 CallAddress
+ );
+
+/**
+ Routine for generating soft interrupt.
+
+ @param Vector The interrupt vector number.
+
+**/
+VOID
+GenerateSoftInit (
+ UINT8 Vector
+ );
+
+/**
+ Allocate memory for legacy usage.
+
+ @param AllocateType The type of allocation to perform.
+ @param MemoryType The type of memory to allocate.
+ @param StartPageAddress Start address of range
+ @param Pages Number of pages to allocate
+ @param Result Result of allocation
+
+ @retval EFI_SUCCESS Legacy16 code loaded
+ @retval Other No protocol installed, unload driver.
+
+**/
+EFI_STATUS
+AllocateLegacyMemory (
+ IN EFI_ALLOCATE_TYPE AllocateType,
+ IN EFI_MEMORY_TYPE MemoryType,
+ IN EFI_PHYSICAL_ADDRESS StartPageAddress,
+ IN UINTN Pages,
+ OUT EFI_PHYSICAL_ADDRESS *Result
+ );
+
+/**
+ Get a region from the LegacyBios for Tiano usage. Can only be invoked once.
+
+ @param This Protocol instance pointer.
+ @param LegacyMemorySize Size of required region
+ @param Region Region to use. 00 = Either 0xE0000 or 0xF0000
+ block Bit0 = 1 0xF0000 block Bit1 = 1 0xE0000
+ block
+ @param Alignment Address alignment. Bit mapped. First non-zero
+ bit from right is alignment.
+ @param LegacyMemoryAddress Region Assigned
+
+ @retval EFI_SUCCESS Region assigned
+ @retval EFI_ACCESS_DENIED Procedure previously invoked
+ @retval Other Region not assigned
+
+**/
+EFI_STATUS
+EFIAPI
+LegacyBiosGetLegacyRegion (
+ IN EFI_LEGACY_BIOS_PROTOCOL *This,
+ IN UINTN LegacyMemorySize,
+ IN UINTN Region,
+ IN UINTN Alignment,
+ OUT VOID **LegacyMemoryAddress
+ );
+
+/**
+ Get a region from the LegacyBios for Tiano usage. Can only be invoked once.
+
+ @param This Protocol instance pointer.
+ @param LegacyMemorySize Size of data to copy
+ @param LegacyMemoryAddress Legacy Region destination address Note: must
+ be in region assigned by
+ LegacyBiosGetLegacyRegion
+ @param LegacyMemorySourceAddress Source of data
+
+ @retval EFI_SUCCESS Region assigned
+ @retval EFI_ACCESS_DENIED Destination outside assigned region
+
+**/
+EFI_STATUS
+EFIAPI
+LegacyBiosCopyLegacyRegion (
+ IN EFI_LEGACY_BIOS_PROTOCOL *This,
+ IN UINTN LegacyMemorySize,
+ IN VOID *LegacyMemoryAddress,
+ IN VOID *LegacyMemorySourceAddress
+ );
+
+/**
+ Find Legacy16 BIOS image in the FLASH device and shadow it into memory. Find
+ the $EFI table in the shadow area. Thunk into the Legacy16 code after it had
+ been shadowed.
+
+ @param Private Legacy BIOS context data
+
+ @retval EFI_SUCCESS Legacy16 code loaded
+ @retval Other No protocol installed, unload driver.
+
+**/
+EFI_STATUS
+ShadowAndStartLegacy16 (
+ IN LEGACY_BIOS_INSTANCE *Private
+ );
+
+/**
+ Checks the state of the floppy and if media is inserted.
+
+ This routine checks the state of the floppy and if media is inserted.
+ There are 3 cases:
+ No floppy present - Set BBS entry to ignore
+ Floppy present & no media - Set BBS entry to lowest priority. We cannot
+ set it to ignore since 16-bit CSM will
+ indicate no floppy and thus drive A: is
+ unusable. CSM-16 will not try floppy since
+ lowest priority and thus not incur boot
+ time penality.
+ Floppy present & media - Set BBS entry to some priority.
+
+ @return State of floppy media
+
+**/
+UINT8
+HasMediaInFloppy (
+ VOID
+ );
+
+/**
+ Identify drive data must be updated to actual parameters before boot.
+ This requires updating the checksum, if it exists.
+
+ @param IdentifyDriveData ATA Identify Data
+ @param Checksum checksum of the ATA Identify Data
+
+ @retval EFI_SUCCESS checksum calculated
+ @retval EFI_SECURITY_VIOLATION IdentifyData invalid
+
+**/
+EFI_STATUS
+CalculateIdentifyDriveChecksum (
+ IN UINT8 *IdentifyDriveData,
+ OUT UINT8 *Checksum
+ );
+
+/**
+ Identify drive data must be updated to actual parameters before boot.
+
+ @param IdentifyDriveData ATA Identify Data
+
+**/
+VOID
+UpdateIdentifyDriveData (
+ IN UINT8 *IdentifyDriveData
+ );
+
+/**
+ Complete build of BBS TABLE.
+
+ @param Private Legacy BIOS Instance data
+ @param BbsTable BBS Table passed to 16-bit code
+
+ @retval EFI_SUCCESS Removable media not present
+
+**/
+EFI_STATUS
+LegacyBiosBuildBbs (
+ IN LEGACY_BIOS_INSTANCE *Private,
+ IN BBS_TABLE *BbsTable
+ );
+
+/**
+ Read CMOS register through index/data port.
+
+ @param[in] Index The index of the CMOS register to read.
+
+ @return The data value from the CMOS register specified by Index.
+
+**/
+UINT8
+LegacyReadStandardCmos (
+ IN UINT8 Index
+ );
+
+/**
+ Write CMOS register through index/data port.
+
+ @param[in] Index The index of the CMOS register to write.
+ @param[in] Value The value of CMOS register to write.
+
+ @return The value written to the CMOS register specified by Index.
+
+**/
+UINT8
+LegacyWriteStandardCmos (
+ IN UINT8 Index,
+ IN UINT8 Value
+ );
+
+/**
+ Calculate the new standard CMOS checksum and write it.
+
+ @param Private Legacy BIOS Instance data
+
+ @retval EFI_SUCCESS Calculate 16-bit checksum successfully
+
+**/
+EFI_STATUS
+LegacyCalculateWriteStandardCmosChecksum (
+ VOID
+ );
+
+/**
+ Test to see if a legacy PCI ROM exists for this device. Optionally return
+ the Legacy ROM instance for this PCI device.
+
+ @param[in] This Protocol instance pointer.
+ @param[in] PciHandle The PCI PC-AT OPROM from this devices ROM BAR will be loaded
+ @param[out] RomImage Return the legacy PCI ROM for this device
+ @param[out] RomSize Size of ROM Image
+ @param[out] RuntimeImageLength Runtime size of ROM Image
+ @param[out] Flags Indicates if ROM found and if PC-AT.
+ @param[out] OpromRevision Revision of the PCI Rom
+ @param[out] ConfigUtilityCodeHeaderPointer of Configuration Utility Code Header
+
+ @return EFI_SUCCESS Legacy Option ROM available for this device
+ @return EFI_ALREADY_STARTED This device is already managed by its Oprom
+ @return EFI_UNSUPPORTED Legacy Option ROM not supported.
+
+**/
+EFI_STATUS
+LegacyBiosCheckPciRomEx (
+ IN EFI_LEGACY_BIOS_PROTOCOL *This,
+ IN EFI_HANDLE PciHandle,
+ OUT VOID **RomImage, OPTIONAL
+ OUT UINTN *RomSize, OPTIONAL
+ OUT UINTN *RuntimeImageLength, OPTIONAL
+ OUT UINTN *Flags, OPTIONAL
+ OUT UINT8 *OpromRevision, OPTIONAL
+ OUT VOID **ConfigUtilityCodeHeader OPTIONAL
+ );
+
+/**
+ Relocate this image under 4G memory for IPF.
+
+ @param ImageHandle Handle of driver image.
+ @param SystemTable Pointer to system table.
+
+ @retval EFI_SUCCESS Image successfully relocated.
+ @retval EFI_ABORTED Failed to relocate image.
+
+**/
+EFI_STATUS
+RelocateImageUnder4GIfNeeded (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ );
+
+/**
+ Thunk to 16-bit real mode and call Segment:Offset. Regs will contain the
+ 16-bit register context on entry and exit. Arguments can be passed on
+ the Stack argument
+
+ @param This Protocol instance pointer.
+ @param Segment Segemnt of 16-bit mode call
+ @param Offset Offset of 16-bit mdoe call
+ @param Regs Register contexted passed into (and returned) from thunk to
+ 16-bit mode
+ @param Stack Caller allocated stack used to pass arguments
+ @param StackSize Size of Stack in bytes
+
+ @retval FALSE Thunk completed, and there were no BIOS errors in the target code.
+ See Regs for status.
+ @retval TRUE There was a BIOS erro in the target code.
+
+**/
+BOOLEAN
+EFIAPI
+InternalLegacyBiosFarCall (
+ IN EFI_LEGACY_BIOS_PROTOCOL *This,
+ IN UINT16 Segment,
+ IN UINT16 Offset,
+ IN EFI_IA32_REGISTER_SET *Regs,
+ IN VOID *Stack,
+ IN UINTN StackSize
+ );
+
+/**
+ Load a legacy PC-AT OpROM for VGA controller.
+
+ @param Private Driver private data.
+
+ @retval EFI_SUCCESS Legacy ROM successfully installed for this device.
+ @retval EFI_DEVICE_ERROR No VGA device handle found, or native EFI video
+ driver cannot be successfully disconnected, or VGA
+ thunk driver cannot be successfully connected.
+
+**/
+EFI_STATUS
+LegacyBiosInstallVgaRom (
+ IN LEGACY_BIOS_INSTANCE *Private
+ );
+
+#endif
|