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system76-edk2/IntelFrameworkPkg/Include/Protocol/LegacyBios.h

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/** @file
The EFI Legacy BIOS Protocol is used to abstract legacy Option ROM usage
under EFI and Legacy OS boot.
Note: The names for EFI_IA32_REGISTER_SET elements were picked to follow
well known naming conventions.
Thunk - A thunk is a transition from one processor mode to another. A Thunk
is a transition from native EFI mode to 16-bit mode. A reverse thunk
would be a transition from 16-bit mode to native EFI mode.
You most likely should not use this protocol! Find the EFI way to solve the
problem to make your code portable
Copyright (c) 2007, Intel Corporation
All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
Module Name: LegacyBios.h
@par Revision Reference:
This protocol is defined in Framework for EFI Compatibility Support Module spec
Version 0.96
**/
#ifndef _EFI_LEGACY_BIOS_H_
#define _EFI_LEGACY_BIOS_H_
#include <FrameworkDxe.h>
#define EFI_LEGACY_BIOS_PROTOCOL_GUID \
{ \
0xdb9a1e3d, 0x45cb, 0x4abb, {0x85, 0x3b, 0xe5, 0x38, 0x7f, 0xdb, 0x2e, 0x2d } \
}
typedef struct _EFI_LEGACY_BIOS_PROTOCOL EFI_LEGACY_BIOS_PROTOCOL;
//
/// @bug: These macros appear in no specifications and are kept for backward
// compatibility only.
// Convert from 32-bit address (_Adr) to Segment:Offset 16-bit form
//
#define EFI_SEGMENT(_Adr) (UINT16) ((UINT16) (((UINTN) (_Adr)) >> 4) & 0xf000)
#define EFI_OFFSET(_Adr) (UINT16) (((UINT16) ((UINTN) (_Adr))) & 0xffff)
#define BYTE_GRANULARITY 0x01
#define WORD_GRANULARITY 0x02
#define DWORD_GRANULARITY 0x04
#define QWORD_GRANULARITY 0x08
#define PARAGRAPH_GRANULARITY 0x10
#define CARRY_FLAG 0x01
//*********************************************************
// EFI_EFLAGS_REG
//*********************************************************
typedef struct {
UINT32 CF:1;
UINT32 Reserved1:1;
UINT32 PF:1;
UINT32 Reserved2:1;
UINT32 AF:1;
UINT32 Reserved3:1;
UINT32 ZF:1;
UINT32 SF:1;
UINT32 TF:1;
UINT32 IF:1;
UINT32 DF:1;
UINT32 OF:1;
UINT32 IOPL:2;
UINT32 NT:1;
UINT32 Reserved4:2;
UINT32 VM:1;
UINT32 Reserved5:14;
} EFI_EFLAGS_REG;
//*********************************************************
// EFI_DWORD_REGS
//*********************************************************
typedef struct {
UINT32 EAX;
UINT32 EBX;
UINT32 ECX;
UINT32 EDX;
UINT32 ESI;
UINT32 EDI;
EFI_EFLAGS_REG EFlags;
UINT16 ES;
UINT16 CS;
UINT16 SS;
UINT16 DS;
UINT16 FS;
UINT16 GS;
UINT32 EBP;
UINT32 ESP;
} EFI_DWORD_REGS;
//*******************************************
// EFI_FLAGS_REG
//*******************************************
typedef struct {
UINT16 CF:1;
UINT16 Reserved1:1;
UINT16 PF:1;
UINT16 Reserved2:1;
UINT16 AF:1;
UINT16 Reserved3:1;
UINT16 ZF:1;
UINT16 SF:1;
UINT16 TF:1;
UINT16 IF:1;
UINT16 DF:1;
UINT16 OF:1;
UINT16 IOPL:2;
UINT16 NT:1;
UINT16 Reserved4:1;
} EFI_FLAGS_REG;
//*********************************************************
// EFI_WORD_REGS
//*********************************************************
typedef struct {
UINT16 AX;
UINT16 ReservedAX;
UINT16 BX;
UINT16 ReservedBX;
UINT16 CX;
UINT16 ReservedCX;
UINT16 DX;
UINT16 ReservedDX;
UINT16 SI;
UINT16 ReservedSI;
UINT16 DI;
UINT16 ReservedDI;
EFI_FLAGS_REG Flags;
UINT16 ReservedFlags;
UINT16 ES;
UINT16 CS;
UINT16 SS;
UINT16 DS;
UINT16 FS;
UINT16 GS;
UINT16 BP;
UINT16 ReservedBP;
UINT16 SP;
UINT16 ReservedSP;
} EFI_WORD_REGS;
//*********************************************************
// EFI_BYTE_REGS
//*********************************************************
typedef struct {
UINT8 AL, AH;
UINT16 ReservedAX;
UINT8 BL, BH;
UINT16 ReservedBX;
UINT8 CL, CH;
UINT16 ReservedCX;
UINT8 DL, DH;
UINT16 ReservedDX;
} EFI_BYTE_REGS;
typedef union {
EFI_DWORD_REGS E;
EFI_WORD_REGS X;
EFI_BYTE_REGS H;
} EFI_IA32_REGISTER_SET;
/**
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 Reg 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.
**/
typedef
BOOLEAN
(EFIAPI *EFI_LEGACY_BIOS_INT86)(
IN EFI_LEGACY_BIOS_PROTOCOL *This,
IN UINT8 BiosInt,
IN OUT 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 Reg 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.
**/
typedef
BOOLEAN
(EFIAPI *EFI_LEGACY_BIOS_FARCALL86)(
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 availible for this device
@retval EFI_UNSUPPORTED Legacy Option ROM not supported.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_LEGACY_BIOS_CHECK_ROM)(
IN EFI_LEGACY_BIOS_PROTOCOL *This,
IN EFI_HANDLE PciHandle,
OUT VOID **RomImage, OPTIONAL
OUT UINTN *RomSize, OPTIONAL
OUT UINTN *Flags
);
/**
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 Return Status if ROM was found and if was Legacy OPROM.
@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 RomShadowSize Size of RomShadowAddress in bytes
@retval EFI_SUCCESS Thunk completed, see Regs for status.
@retval EFI_INVALID_PARAMETER PciHandle not found
**/
typedef
EFI_STATUS
(EFIAPI *EFI_LEGACY_BIOS_INSTALL_ROM)(
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 *ShadowedRomSize OPTIONAL
);
/**
Attempt to legacy boot the BootOption. If the EFI contexted has been
compromised this function will not return.
@param This Protocol instance pointer.
@param BootOption EFI Device Path from BootXXXX variable.
@param LoadOptionSize Size of LoadOption in size.
@param LoadOption LoadOption from BootXXXX variable
@retval EFI_SUCCESS Removable media not present
**/
typedef
EFI_STATUS
(EFIAPI *EFI_LEGACY_BIOS_BOOT)(
IN EFI_LEGACY_BIOS_PROTOCOL *This,
IN BBS_BBS_DEVICE_PATH *BootOption,
IN UINT32 LoadOptionsSize,
IN VOID *LoadOptions
);
/**
Update BDA with current Scroll, Num & Cap lock LEDS
@param This Protocol instance pointer.
@param Leds Status of current Scroll, Num & Cap lock LEDS
Bit 0 is Scroll Lock 0 = Not locked
Bit 1 is Num Lock
Bit 2 is Caps Lock
@retval EFI_SUCCESS Removable media not present
**/
typedef
EFI_STATUS
(EFIAPI *EFI_LEGACY_BIOS_UPDATE_KEYBOARD_LED_STATUS)(
IN EFI_LEGACY_BIOS_PROTOCOL *This,
IN UINT8 Leds
);
/**
Retrieve legacy BBS info and assign boot priority.
@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
**/
typedef
EFI_STATUS
(EFIAPI *EFI_LEGACY_BIOS_GET_BBS_INFO)(
IN EFI_LEGACY_BIOS_PROTOCOL *This,
OUT UINT16 *HddCount,
OUT HDD_INFO **HddInfo,
OUT UINT16 *BbsCount,
IN OUT BBS_TABLE **BbsTable
);
/**
Assign drive number to legacy HDD drives prior to booting an EFI
aware OS so the OS can access drives without an EFI driver.
@param This Protocol instance pointer.
@param BbsCount Number of BBS_TABLE structures
@param BbsTable List BBS entries
@retval EFI_SUCCESS Drive numbers assigned
**/
typedef
EFI_STATUS
(EFIAPI *EFI_LEGACY_BIOS_PREPARE_TO_BOOT_EFI)(
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.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_LEGACY_BIOS_BOOT_UNCONVENTIONAL_DEVICE)(
IN EFI_LEGACY_BIOS_PROTOCOL *This,
IN UDC_ATTRIBUTES Attributes,
IN UINTN BbsEntry,
IN VOID *BeerData,
IN VOID *ServiceAreaData
);
/**
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.
@retval EFI_SUCCESS OPROMs shadowed
**/
typedef
EFI_STATUS
(EFIAPI *EFI_LEGACY_BIOS_SHADOW_ALL_LEGACY_OPROMS)(
IN EFI_LEGACY_BIOS_PROTOCOL *This
);
/**
Get a region from the LegacyBios for S3 usage.
@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 Other Region not assigned
**/
typedef
EFI_STATUS
(EFIAPI *EFI_LEGACY_BIOS_GET_LEGACY_REGION)(
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
**/
typedef
EFI_STATUS
(EFIAPI *EFI_LEGACY_BIOS_COPY_LEGACY_REGION)(
IN EFI_LEGACY_BIOS_PROTOCOL *This,
IN UINTN LegacyMemorySize,
IN VOID *LegacyMemoryAddress,
IN VOID *LegacyMemorySourceAddress
);
/**
@par Protocol Description:
Abstracts the traditional BIOS from the rest of EFI. The LegacyBoot()
member function allows the BDS to support booting a traditional OS.
EFI thunks drivers that make EFI bindings for BIOS INT services use
all the other member functions.
@param Int86
Performs traditional software INT. See the Int86() function description.
@param FarCall86
Performs a far call into Compatibility16 or traditional OpROM code.
@param CheckPciRom
Checks if a traditional OpROM exists for this device.
@param InstallPciRom
Loads a traditional OpROM in traditional OpROM address space.
@param LegacyBoot
Boots a traditional OS.
@param UpdateKeyboardLedStatus
Updates BDA to reflect the current EFI keyboard LED status.
@param GetBbsInfo
Allows an external agent, such as BIOS Setup, to get the BBS data.
@param ShadowAllLegacyOproms
Causes all legacy OpROMs to be shadowed.
@param PrepareToBootEfi
Performs all actions prior to boot. Used when booting an EFI-aware OS
rather than a legacy OS.
@param GetLegacyRegion
Allows EFI to reserve an area in the 0xE0000 or 0xF0000 block.
@param CopyLegacyRegion
Allows EFI to copy data to the area specified by GetLegacyRegion.
@param BootUnconventionalDevice
Allows the user to boot off an unconventional device such as a PARTIES partition.
**/
struct _EFI_LEGACY_BIOS_PROTOCOL {
EFI_LEGACY_BIOS_INT86 Int86;
EFI_LEGACY_BIOS_FARCALL86 FarCall86;
EFI_LEGACY_BIOS_CHECK_ROM CheckPciRom;
EFI_LEGACY_BIOS_INSTALL_ROM InstallPciRom;
EFI_LEGACY_BIOS_BOOT LegacyBoot;
EFI_LEGACY_BIOS_UPDATE_KEYBOARD_LED_STATUS UpdateKeyboardLedStatus;
EFI_LEGACY_BIOS_GET_BBS_INFO GetBbsInfo;
EFI_LEGACY_BIOS_SHADOW_ALL_LEGACY_OPROMS ShadowAllLegacyOproms;
EFI_LEGACY_BIOS_PREPARE_TO_BOOT_EFI PrepareToBootEfi;
EFI_LEGACY_BIOS_GET_LEGACY_REGION GetLegacyRegion;
EFI_LEGACY_BIOS_COPY_LEGACY_REGION CopyLegacyRegion;
EFI_LEGACY_BIOS_BOOT_UNCONVENTIONAL_DEVICE BootUnconventionalDevice;
};
extern EFI_GUID gEfiLegacyBiosProtocolGuid;
#endif
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