mirror of https://github.com/acidanthera/audk.git
120 lines
3.8 KiB
C
120 lines
3.8 KiB
C
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/*++
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Copyright (c) 2006, Intel Corporation
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All rights reserved. This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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Module Name:
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LegacyBiosThunk.h
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Abstract:
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The EFI Legacy BIOS Thunk Protocol is used to abstract Thunk16 call.
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Note: The names for EFI_IA32_REGISTER_SET elements were picked to follow
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well known naming conventions.
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Thunk - A thunk is a transition from one processor mode to another. A Thunk
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is a transition from native EFI mode to 16-bit mode. A reverse thunk
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would be a transition from 16-bit mode to native EFI mode.
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Note: Note: Note: Note: Note: Note: Note:
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You most likely should not use this protocol! Find the EFI way to solve the
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problem to make your code portable
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Note: Note: Note: Note: Note: Note: Note:
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Revision History
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--*/
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#ifndef _EFI_LEGACY_BIOS_THUNK_H_
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#define _EFI_LEGACY_BIOS_THUNK_H_
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#define EFI_LEGACY_BIOS_THUNK_PROTOCOL_GUID \
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{ \
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0x4c51a7ba, 0x7195, 0x442d, 0x87, 0x92, 0xbe, 0xea, 0x6e, 0x2f, 0xf6, 0xec \
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}
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typedef struct _EFI_LEGACY_BIOS_THUNK_PROTOCOL EFI_LEGACY_BIOS_THUNK_PROTOCOL;
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typedef
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BOOLEAN
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(EFIAPI *EFI_LEGACY_BIOS_THUNK_INT86) (
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IN EFI_LEGACY_BIOS_THUNK_PROTOCOL * This,
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IN UINT8 BiosInt,
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IN OUT EFI_IA32_REGISTER_SET * Regs
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)
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/*++
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Routine Description:
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Thunk to 16-bit real mode and execute a software interrupt with a vector
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of BiosInt. Regs will contain the 16-bit register context on entry and
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exit.
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Arguments:
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This - Protocol instance pointer.
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BiosInt - Processor interrupt vector to invoke
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Reg - Register contexted passed into (and returned) from thunk to
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16-bit mode
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Returns:
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FALSE - Thunk completed, and there were no BIOS errors in the target code.
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See Regs for status.
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TRUE - There was a BIOS erro in the target code.
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--*/
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;
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typedef
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BOOLEAN
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(EFIAPI *EFI_LEGACY_BIOS_THUNK_FARCALL86) (
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IN EFI_LEGACY_BIOS_THUNK_PROTOCOL * This,
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IN UINT16 Segment,
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IN UINT16 Offset,
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IN EFI_IA32_REGISTER_SET * Regs,
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IN VOID *Stack,
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IN UINTN StackSize
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)
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/*++
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Routine Description:
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Thunk to 16-bit real mode and call Segment:Offset. Regs will contain the
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16-bit register context on entry and exit. Arguments can be passed on
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the Stack argument
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Arguments:
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This - Protocol instance pointer.
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Segment - Segemnt of 16-bit mode call
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Offset - Offset of 16-bit mdoe call
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Reg - Register contexted passed into (and returned) from thunk to
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16-bit mode
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Stack - Caller allocated stack used to pass arguments
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StackSize - Size of Stack in bytes
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Returns:
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FALSE - Thunk completed, and there were no BIOS errors in the target code.
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See Regs for status.
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TRUE - There was a BIOS erro in the target code.
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--*/
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;
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struct _EFI_LEGACY_BIOS_THUNK_PROTOCOL {
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EFI_LEGACY_BIOS_THUNK_INT86 Int86;
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EFI_LEGACY_BIOS_THUNK_FARCALL86 FarCall86;
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};
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extern EFI_GUID gEfiLegacyBiosThunkProtocolGuid;
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#endif
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