/*++

Copyright (c) 2004 - 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
    
Abstract:

  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.


  Note: Note: Note: Note: Note: Note: Note:

  You most likely should not use this protocol! Find the EFI way to solve the
  problem to make your code portable

  Note: Note: Note: Note: Note: Note: Note:

Revision History

  The EFI Legacy BIOS Protocol is compliant with CSM spec 0.96.

--*/

#ifndef _EFI_LEGACY_BIOS_H
#define _EFI_LEGACY_BIOS_H

#define EFI_LEGACY_BIOS_PROTOCOL_GUID \
  { \
    0xdb9a1e3d, 0x45cb, 0x4abb, {0x85, 0x3b, 0xe5, 0x38, 0x7f, 0xdb, 0x2e, 0x2d} \
  }

EFI_FORWARD_DECLARATION (EFI_LEGACY_BIOS_PROTOCOL);

//
// 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

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;

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;

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;

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;

typedef struct {
  UINT8   AL;
  UINT8   AH;
  UINT16  ReservedAX;
  UINT8   BL;
  UINT8   BH;
  UINT16  ReservedBX;
  UINT8   CL;
  UINT8   CH;
  UINT16  ReservedCX;
  UINT8   DL;
  UINT8   DH;
  UINT16  ReservedDX;
} EFI_BYTE_REGS;

typedef union {
  EFI_DWORD_REGS E;
  EFI_WORD_REGS  X;
  EFI_BYTE_REGS  H;
} EFI_IA32_REGISTER_SET;

#pragma pack(1)
//
// $EFI table created by Legacy16 code and consumed by EFI Legacy driver
//
typedef struct {
  UINT32  Signature;      // "$EFI"
  UINT8   TableChecksum;
  UINT8   TableLength;
  UINT8   EfiMajorRevision;
  UINT8   EfiMinorRevision;
  UINT8   TableMajorRevision;
  UINT8   TableMinorRevision;
  UINT16  Reserved;
  UINT16  Compatibility16CallSegment;
  UINT16  Compatibility16CallOffset;

  UINT16  PnPInstallationCheckSegment;
  UINT16  PnPInstallationCheckOffset;

  UINT32  EfiSystemTable; // IPF - CSM Integration
  UINT32  OemIdStringPointer;
  UINT32  AcpiRsdPtrPointer;
  UINT16  OemRevision;
  UINT32  E820Pointer;
  UINT32  E820Length;
  UINT32  IrqRoutingTablePointer;
  UINT32  IrqRoutingTableLength;
  UINT32  MpTablePtr;
  UINT32  MpTableLength;
  UINT16  OemIntSegment;
  UINT16  OemIntOffset;
  UINT16  Oem32Segment;
  UINT16  Oem32Offset;
  UINT16  Oem16Segment;
  UINT16  Oem16Offset;
  UINT16  TpmSegment;
  UINT16  TpmOffset;
  UINT32  IbvPointer;
  UINT32  PciExpressBase;
  UINT8   LastPciBus;

} EFI_COMPATIBILITY16_TABLE;

typedef enum {
  Compatibility16InitializeYourself     = 0x0000,
  Compatibility16UpdateBbs              = 0x0001,
  Compatibility16PrepareToBoot          = 0x0002,
  Compatibility16Boot                   = 0x0003,
  Compatibility16RetrieveLastBootDevice = 0x0004,
  Compatibility16DispatchOprom          = 0x0005,
  Compatibility16GetTableAddress        = 0x0006,
  Compatibility16SetKeyboardLeds        = 0x0007,
  Compatibility16InstallPciHandler      = 0x0008
} EFI_COMPATIBILITY_FUNCTIONS;

//
// define maximum number of HDD system supports
//
#define MAX_HDD_ENTRIES 0x30

typedef struct {
  UINT16  Raw[256];
} ATAPI_IDENTIFY;

//
// HDD_INFO status
//
#define HDD_PRIMARY               0x01
#define HDD_SECONDARY             0x02
#define HDD_MASTER_ATAPI_CDROM    0x04
#define HDD_SLAVE_ATAPI_CDROM     0x08
#define HDD_MASTER_IDE            0x20
#define HDD_SLAVE_IDE             0x40
#define HDD_MASTER_ATAPI_ZIPDISK  0x10
#define HDD_SLAVE_ATAPI_ZIPDISK   0x80

typedef struct {
  UINT16          Status;
  UINT32          Bus;
  UINT32          Device;
  UINT32          Function;
  UINT16          CommandBaseAddress;
  UINT16          ControlBaseAddress;
  UINT16          BusMasterAddress;
  UINT8           HddIrq;
  ATAPI_IDENTIFY  IdentifyDrive[2];
} HDD_INFO;

//
// Parties data structures
//
typedef struct {
  UINT8 DirectoryServiceValidity : 1;
  UINT8 RabcaUsedFlag : 1;
  UINT8 ExecuteHddDiagnosticsFlag : 1;
  UINT8 Reserved : 5;
} UDC_ATTRIBUTES;

typedef struct {
  UDC_ATTRIBUTES  Attributes;
  UINT8           DeviceNumber;
  UINT8           BbsTableEntryNumberForParentDevice;
  UINT8           BbsTableEntryNumberForBoot;
  UINT8           BbsTableEntryNumberForHddDiag;
  UINT8           BeerData[128];
  UINT8           ServiceAreaData[64];
} UD_TABLE;

//
// define BBS Device Types
//
#define BBS_FLOPPY        0x01
#define BBS_HARDDISK      0x02
#define BBS_CDROM         0x03
#define BBS_PCMCIA        0x04
#define BBS_USB           0x05
#define BBS_EMBED_NETWORK 0x06
#define BBS_BEV_DEVICE    0x80
#define BBS_UNKNOWN       0xff

typedef struct {
  UINT16  OldPosition : 4;
  UINT16  Reserved1 : 4;
  UINT16  Enabled : 1;
  UINT16  Failed : 1;
  UINT16  MediaPresent : 2;
  UINT16  Reserved2 : 4;
} BBS_STATUS_FLAGS;

#define MAX_BBS_ENTRIES 0x100
//
// BBS_IGNORE_ENTRY is placed in the BootPriority field if the entry is to
// be skipped.
// BBS_UNPRIORITIZED_ENTRY is placed in the BootPriority field before
// priority has been assigned but indicates valid entry.
// BBS_LOWEST_PRIORITY is normally used for removable media with no media
//   inserted. This allows the 16-bit CSM to allocate a drive letter to
//   the device.
// BBS_DO_NOT_BOOT_FROM is used for devices that the 16-bit CSM is to assign
//   a drive letter to but never boot from.
//
// AdditionalIrq??Handler usage is IBV specific. The fields have been added
// for:
//   1. Saving non-BBS card info about IRQs taken by card.
//   2. For BBS compliant cards that hook IRQs in order to have their SETUP
//      executed.
//
#define BBS_DO_NOT_BOOT_FROM    0xFFFC
#define BBS_LOWEST_PRIORITY     0xFFFD
#define BBS_UNPRIORITIZED_ENTRY 0xFFFE
#define BBS_IGNORE_ENTRY        0xFFFF

typedef struct {
  UINT16            BootPriority;
  UINT32            Bus;
  UINT32            Device;
  UINT32            Function;
  UINT8             Class;
  UINT8             SubClass;
  UINT16            MfgStringOffset;
  UINT16            MfgStringSegment;
  UINT16            DeviceType;
  BBS_STATUS_FLAGS  StatusFlags;
  UINT16            BootHandlerOffset;
  UINT16            BootHandlerSegment;
  UINT16            DescStringOffset;
  UINT16            DescStringSegment;
  UINT32            InitPerReserved;
  UINT32            AdditionalIrq13Handler;
  UINT32            AdditionalIrq18Handler;
  UINT32            AdditionalIrq19Handler;
  UINT32            AdditionalIrq40Handler;
  UINT8             AssignedDriveNumber;
  UINT32            AdditionalIrq41Handler;
  UINT32            AdditionalIrq46Handler;
  UINT32            IBV1;
  UINT32            IBV2;
} BBS_TABLE;

#pragma pack()

typedef
BOOLEAN
(EFIAPI *EFI_LEGACY_BIOS_INT86) (
  IN EFI_LEGACY_BIOS_PROTOCOL         * This,
  IN  UINT8                           BiosInt,
  IN OUT  EFI_IA32_REGISTER_SET       * Regs
  )
/*++

  Routine Description:
    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.

  Arguments:
    This    - Protocol instance pointer.
    BiosInt - Processor interrupt vector to invoke
    Reg     - Register contexted passed into (and returned) from thunk to 
              16-bit mode

  Returns:
    FALSE   - Thunk completed, and there were no BIOS errors in the target code.
              See Regs for status.
    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
  )
/*++

  Routine Description:
    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

  Arguments:
    This      - Protocol instance pointer.
    Segment   - Segemnt of 16-bit mode call
    Offset    - Offset of 16-bit mdoe call
    Reg       - Register contexted passed into (and returned) from thunk to 
                16-bit mode
    Stack     - Caller allocated stack used to pass arguments
    StackSize - Size of Stack in bytes

  Returns:
    FALSE     - Thunk completed, and there were no BIOS errors in the target code.
                See Regs for status.
    TRUE      - There was a BIOS erro in the target code.

--*/
;

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

  )
/*++

  Routine Description:
    Test to see if a legacy PCI ROM exists for this device. Optionally return
    the Legacy ROM instance for this PCI device.

  Arguments:
    This      - Protocol instance pointer.
    PciHandle - The PCI PC-AT OPROM from this devices ROM BAR will be loaded
    RomImage  - Return the legacy PCI ROM for this device
    RomSize   - Size of ROM Image
    Flags     - Indicates if ROM found and if PC-AT.

  Returns:
    EFI_SUCCESS  - Legacy Option ROM availible for this device
    EFI_UNSUPPORTED  - Legacy Option ROM not supported.

--*/
;

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
  )
/*++

  Routine Description:
    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:

  Arguments:
    This      - Protocol instance pointer.
    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.
    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.
    Flags     - Return Status if ROM was found and if was Legacy OPROM.
    DiskStart - Disk number of first device hooked by the ROM. If DiskStart
                is the same as DiskEnd no disked were hooked.
    DiskEnd   - Disk number of the last device hooked by the ROM.
    RomShadowAddress  - Shadow address of PC-AT ROM
    RomShadowSize     - Size of RomShadowAddress in bytes

  Returns:
    EFI_SUCCESS  - Thunk completed, see Regs for status.
    EFI_INVALID_PARAMETER  - PciHandle not found

--*/
;

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
  )
/*++

  Routine Description:
    Attempt to legacy boot the BootOption. If the EFI contexted has been 
    compromised this function will not return.

  Arguments:
    This       - Protocol instance pointer.
    BootOption - EFI Device Path from BootXXXX variable.
    LoadOptionSize  - Size of LoadOption in size.
    LoadOption      - LoadOption from BootXXXX variable

  Returns:
    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
  )
/*++

  Routine Description:
    Update BDA with current Scroll, Num & Cap lock LEDS

  Arguments:
    This       - Protocol instance pointer.
    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

  Returns:
    EFI_SUCCESS  - Removable media not present

--*/
;

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
  )
/*++

  Routine Description:
    Retrieve legacy BBS info and assign boot priority.

  Arguments:
    This       - Protocol instance pointer.
    HddCount   - Number of HDD_INFO structures
    HddInfo    - Onboard IDE controller information
    BbsCount   - Number of BBS_TABLE structures
    BbsTable   - List BBS entries

  Returns:
    EFI_SUCCESS  - Tables returned

--*/
;

typedef
EFI_STATUS
(EFIAPI *EFI_LEGACY_BIOS_PREPARE_TO_BOOT_EFI) (
  IN EFI_LEGACY_BIOS_PROTOCOL         * This,
  OUT UINT16                          *BbsCount,
  OUT BBS_TABLE                       **BbsTable
  )
/*++

  Routine Description:
    Assign drive number to legacy HDD drives prior to booting an EFI
    aware OS so the OS can access drives without an EFI driver.

  Arguments:
    This       - Protocol instance pointer.
    BbsCount   - Number of BBS_TABLE structures
    BbsTable   - List BBS entries

  Returns:
    EFI_SUCCESS  - Drive numbers assigned

--*/
;

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
  )
/*++

  Routine Description:
    To boot from an unconventional device like parties and/or execute
    HDD diagnostics.

  Arguments:
    This            - Protocol instance pointer.
    Attributes      - How to interpret the other input parameters
    BbsEntry        - The 0-based index into the BbsTable for the parent 
                      device.
    BeerData        - Pointer to the 128 bytes of ram BEER data.
    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. 
  Returns:
    EFI_INVALID_PARAMETER if error. Does NOT return if no error.

--*/
;

typedef
EFI_STATUS
(EFIAPI *EFI_LEGACY_BIOS_SHADOW_ALL_LEGACY_OPROMS) (
  IN EFI_LEGACY_BIOS_PROTOCOL * This
  )
/*++

  Routine Description:
    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.
  Arguments:

  Returns:
    EFI_SUCCESS  - OPROMs shadowed

--*/
;

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
  )
/*++

Routine Description:
  Get a region from the LegacyBios for S3 usage.

Arguments:
    This                   - Protocol instance pointer.
    LegacyMemorySize     - Size of required region
    Region                 - Region to use.
                                 00 = Either 0xE0000 or 0xF0000 block
                                 Bit0 = 1 0xF0000 block
                                 Bit1 = 1 0xE0000 block
    Alignment             - Address alignment. Bit mapped. First non-zero 
                            bit from right is alignment.
    LegacyMemoryAddress  - Region Assigned

Returns: 

  EFI_SUCCESS - Region assigned

  Other       - Region not assigned

--*/
;

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
  )
/*++

Routine Description:
  Get a region from the LegacyBios for Tiano usage. Can only be invoked once.

Arguments:
    This                         - Protocol instance pointer.
    LegacyMemorySize             - Size of data to copy
    LegacyMemoryAddress          - Legacy Region destination address
                                   Note: must be in region assigned by
                                         LegacyBiosGetLegacyRegion
    LegacyMemorySourceAddress    - Source of data

Returns: 

  EFI_SUCCESS        - Region assigned
  EFI_ACCESS_DENIED  - Destination outside assigned region

--*/
;

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
