/** @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
