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audk/EdkCompatibilityPkg/Foundation/Library/Thunk16/Thunk16Lib.h

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/*++
Copyright (c) 2006, 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:
Thunk16Lib.h
Abstract:
Real Mode Thunk Header file
--*/
#ifndef __THUNK_16_LIB_H__
#define __THUNK_16_LIB_H__
#include "Tiano.h"
//
// Thunk Flags
//
#define THUNK_SAVE_FP_STATE 0x1
#define THUNK_USER_STACK 0x2
#define THUNK_INTERRUPT 0x10000
//
// Byte packed structure for 16-bit Real Mode FLAGS
//
typedef union {
struct {
UINT32 CF:1; // Carry Flag
UINT32 Reserved_0:1; // Reserved
UINT32 PF:1; // Parity Flag
UINT32 Reserved_1:1; // Reserved
UINT32 AF:1; // Auxiliary Carry Flag
UINT32 Reserved_2:1; // Reserved
UINT32 ZF:1; // Zero Flag
UINT32 SF:1; // Sign Flag
UINT32 TF:1; // Trap Flag
UINT32 IF:1; // Interrupt Enable Flag
UINT32 DF:1; // Direction Flag
UINT32 OF:1; // Overflow Flag
UINT32 IOPL:2; // I/O Privilege Level
UINT32 NT:1; // Nested Task
UINT32 Reserved_3:1; // Reserved
} Bits;
UINTN UintN;
} IA32_FLAGS16;
//
// Byte packed structure for EFLAGS
// 32-bits on IA32
// 64-bits on X64
//
typedef union {
struct {
UINT32 CF:1; // Carry Flag
UINT32 Reserved_0:1; // Reserved
UINT32 PF:1; // Parity Flag
UINT32 Reserved_1:1; // Reserved
UINT32 AF:1; // Auxiliary Carry Flag
UINT32 Reserved_2:1; // Reserved
UINT32 ZF:1; // Zero Flag
UINT32 SF:1; // Sign Flag
UINT32 TF:1; // Trap Flag
UINT32 IF:1; // Interrupt Enable Flag
UINT32 DF:1; // Direction Flag
UINT32 OF:1; // Overflow Flag
UINT32 IOPL:2; // I/O Privilege Level
UINT32 NT:1; // Nested Task
UINT32 Reserved_3:1; // Reserved
UINT32 RF:1; // Resume Flag
UINT32 VM:1; // Virtual 8086 Mode
UINT32 AC:1; // Alignment Check
UINT32 VIF:1; // Virtual Interrupt Flag
UINT32 VIP:1; // Virtual Interrupt Pending
UINT32 ID:1; // ID Flag
UINT32 Reserved_4:10; // Reserved
} Bits;
UINTN UintN;
} IA32_EFLAGS32;
//
// Byte packed structure for an FP/SSE/SSE2 context
//
typedef struct {
UINT8 Buffer[512];
} IA32_FX_BUFFER;
//
// Structures for the 16-bit real mode thunks
//
typedef struct {
UINT32 Reserved1;
UINT32 Reserved2;
UINT32 Reserved3;
UINT32 Reserved4;
UINT8 BL;
UINT8 BH;
UINT16 Reserved5;
UINT8 DL;
UINT8 DH;
UINT16 Reserved6;
UINT8 CL;
UINT8 CH;
UINT16 Reserved7;
UINT8 AL;
UINT8 AH;
UINT16 Reserved8;
} IA32_BYTE_REGS;
typedef struct {
UINT16 DI;
UINT16 Reserved1;
UINT16 SI;
UINT16 Reserved2;
UINT16 BP;
UINT16 Reserved3;
UINT16 SP;
UINT16 Reserved4;
UINT16 BX;
UINT16 Reserved5;
UINT16 DX;
UINT16 Reserved6;
UINT16 CX;
UINT16 Reserved7;
UINT16 AX;
UINT16 Reserved8;
UINT16 DS;
UINT16 ES;
UINT16 FS;
UINT16 GS;
IA32_FLAGS16 Flags;
UINT16 IP;
UINT16 Reserved10;
UINT16 CS;
UINT16 SS;
} IA32_WORD_REGS;
typedef struct {
UINT32 EDI;
UINT32 ESI;
UINT32 EBP;
UINT32 ESP;
UINT32 EBX;
UINT32 EDX;
UINT32 ECX;
UINT32 EAX;
UINT16 DS;
UINT16 ES;
UINT16 FS;
UINT16 GS;
IA32_EFLAGS32 EFLAGS;
UINT32 EIP;
UINT16 CS;
UINT16 SS;
} IA32_DWORD_REGS;
typedef union {
IA32_DWORD_REGS E;
IA32_WORD_REGS X;
IA32_BYTE_REGS H;
} IA32_REGISTER_SET;
//
// Byte packed structure for an 16-bit real mode thunks
//
typedef struct {
UINT32 RealModeBuffer;
UINT32 DefaultStack;
} THUNK_CONTEXT;
//
// 16-bit thunking services
//
UINTN
EFIAPI
AsmThunk16GetProperties (
OUT UINTN *MinimumStackSize OPTIONAL
)
/*++
Routine Description:
Returns the properties of this real mode thunk implementation. Currently
there are 2 properties has been defined, the minimum real mode buffer size
and the minimum stack size.
Arguments:
MinimumStackSize - The minimum size required for a 16-bit stack.
Returns:
The minimum size of the real mode buffer needed by this thunk implementation
is returned.
--*/
;
THUNK_CONTEXT *
EFIAPI
AsmThunk16SetProperties (
OUT THUNK_CONTEXT *ThunkContext,
IN VOID *RealModeBuffer,
IN UINTN BufferSize
)
/*++
Routine Description:
Tell this real mode thunk implementation the address and size of the real
mode buffer needed.
Arguments:
ThunkContext - The thunk context whose properties to set.
RealModeBuffer - The address of the buffer allocated by caller. It should be
aligned on a 16-byte boundary.
This buffer must be in identity mapped pages.
BufferSize - The size of RealModeBuffer. Must be larger than the minimum
size required as returned by AsmThunk16GetProperties().
Returns:
None
--*/
;
VOID
EFIAPI
AsmThunk16Destroy (
IN OUT THUNK_CONTEXT *ThunkContext
)
/*++
Routine Description:
Reset all internal states to their initial values. The caller should not
release the real mode buffer until after a call to this function.
Arguments:
ThunkContext - The thunk context to destroy.
Returns:
None
--*/
;
IA32_REGISTER_SET *
EFIAPI
AsmThunk16FarCall86 (
IN THUNK_CONTEXT *ThunkContext,
IN OUT IA32_REGISTER_SET *RegisterSet,
IN UINT32 ThunkFlags
)
/*++
Routine Description:
Make a far call to 16-bit code.
NOTE: This function must be called on TPL_HIGH_LEVEL or with interrupts
disabled because of GDTR and IDTR manipulations.
This function must be placed in identity mapped pages.
Arguments:
ThunkContext - Thunk context to use.
RegisterSet - CPU registers would be set to the values contained in this
structure before making the far call. Then CPU registers are
copied back to this structure.
CS:EIP points to the real mode code being called on input.
SS:ESP points to the real mode stack if THUNK_USER_STACK is
set on input, otherwise ignored.
EFlages is ignored on input.
On output, values of CS, EIP, SS and ESP should be ignored.
ThunkFlags - 2 flags have currently been defined, THUNK_SAVE_FP_STATE and
THUNK_USER_STACK.
THUNK_SAVE_FP_STATE - FPU state would be saved/restored
before/after calling real mode code.
THUNK_USER_STACK - The stack specified by SS:ESP would be
used instead of the default stack.
Returns:
RegisterSet is returned.
--*/
;
IA32_REGISTER_SET *
EFIAPI
AsmThunk16Int86 (
IN THUNK_CONTEXT *ThunkContext,
IN UINT8 IntNumber,
IN OUT IA32_REGISTER_SET *RegisterSet,
IN UINT32 ThunkFlags
)
/*++
Routine Description:
Invoke a 16-bit interrupt handler.
NOTE: This function must be called on TPL_HIGH_LEVEL or with interrupts
disabled because of GDTR and IDTR manipulations.
This function must be placed in identity mapped pages.
Arguments:
ThunkContext - Thunk context to use.
IntNumber - The ordinal of the interrupt handler ranging from 0 to 255.
RegisterSet - CPU registers would be set to the values contained in this
structure before making the far call. Then CPU registers are
copied back to this structure.
SS:ESP points to the real mode stack if THUNK_USER_STACK is
set on input, otherwise ignored.
EFlages is ignored on input.
On output, values of CS, EIP, SS and ESP should be ignored.
ThunkFlags - 2 flags have currently been defined, THUNK_SAVE_FP_STATE and
THUNK_USER_STACK.
THUNK_SAVE_FP_STATE - FPU state would be saved/restored
before/after calling real mode code.
THUNK_USER_STACK - The stack specified by SS:ESP would be
used instead of the default stack.
Returns:
RegisterSet is returned.
--*/
;
#endif
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