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#
# Copyright (c) 2004, Intel Corporation. All rights reserved.<BR>
# 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:
#
# ProcessorAsms.Asm
#
#
#
#include "EfiBind.h"
#------------------------------------------------------------------------------
.686P:
.MMX:
#.MODEL SMALL
.CODE:
#------------------------------------------------------------------------------
.globl ASM_PFX(TransferControlSetJump)
.globl ASM_PFX(TransferControlLongJump)
.globl ASM_PFX(SwitchStacks)
.globl ASM_PFX(SwitchIplStacks)
#define EFI_SUCCESS 0
#define EFI_WARN_RETURN_FROM_LONG_JUMP 5
#
# typedef struct {
# UINT32 ebx;
# UINT32 esi;
# UINT32 edi;
# UINT32 ebp;
# UINT32 esp;
# UINT32 eip;
#} EFI_JUMP_BUFFER;
#
#typedef
#EFI_STATUS
#(EFIAPI *EFI_PEI_TRANSFER_CONTROL_SET_JUMP) (
# IN EFI_PEI_TRANSFER_CONTROL_PROTOCOL *This,
# OUT EFI_JUMP_BUFFER *Context
# );
#
#Routine Description:
#
# This routine implements the IA32 variant of the SetJump call. Its
# responsibility is to store system state information for a possible
# subsequent LongJump.
#
#Arguments:
#
# Pointer to CPU context save buffer.
#
#Returns:
#
# EFI_SUCCESS
#
ASM_PFX(TransferControlSetJump):
push %ebp
mov %esp,%ebp
mov 0x8(%ebp),%eax
mov 0xc(%ebp),%ecx
mov %ebx,(%ecx)
mov %esi,0x4(%ecx)
mov %edi,0x8(%ecx)
mov 0x0(%ebp),%eax
mov %eax,0xc(%ecx)
lea 0x4(%ebp),%eax
mov %eax,0x10(%ecx)
mov 0x4(%ebp),%eax
mov %eax,0x14(%ecx)
mov $0x0,%eax
leave
ret
#typedef
#EFI_STATUS
#(EFIAPI *EFI_PEI_TRANSFER_CONTROL_LONG_JUMP) (
# IN EFI_PEI_TRANSFER_CONTROL_PROTOCOL *This,
# IN EFI_JUMP_BUFFER *Context
# );
#
# Routine Description:
#
# This routine implements the IA32 variant of the LongJump call. Its
# responsibility is restore the system state to the Context Buffer and
# pass control back.
#
# Arguments:
#
# Pointer to CPU context save buffer.
#
# Returns:
#
# EFI_WARN_RETURN_FROM_LONG_JUMP
#
ASM_PFX(TransferControlLongJump):
push %ebp
mov %esp,%ebp
push %ebx
push %esi
push %edi
mov 0x8(%ebp),%eax
mov $0x5,%eax
mov 0xc(%ebp),%ecx
mov (%ecx),%ebx
mov 0x4(%ecx),%esi
mov 0x8(%ecx),%edi
mov 0xc(%ecx),%ebp
mov 0x10(%ecx),%esp
add $0x4,%esp
jmp *0x14(%ecx)
mov $0x5,%eax
pop %edi
pop %esi
pop %ebx
leave
ret
#
# Routine Description:
# This allows the caller to switch the stack and goes to the new entry point
#
# Arguments:
# EntryPoint - Pointer to the location to enter
# Parameter - Parameter to pass in
# NewStack - New Location of the stack
# NewBsp - New BSP
#
# Returns:
#
# Nothing. Goes to the Entry Point passing in the new parameters
#
#SwitchStacks PROC C \
# EntryPoint:PTR DWORD, \
# Parameter:DWORD, \
# NewStack:PTR DWORD, \
# NewBsp:PTR DWORD
ASM_PFX(SwitchStacks):
push %ebp
mov %esp,%ebp
push %ebx
mov 0x14(%ebp),%eax
mov 0xc(%ebp),%ebx
mov 0x8(%ebp),%ecx
mov 0x10(%ebp),%eax
mov %eax,%esp
push %ebx
push $0x0
jmp *%ecx
pop %ebx
leave
ret
#
# Routine Description:
# This allows the caller to switch the stack and goes to the new entry point
#
# Arguments:
# EntryPoint - Pointer to the location to enter
# Parameter1/Parameter2 - Parameter to pass in
# NewStack - New Location of the stack
# NewBsp - New BSP
#
# Returns:
#
# Nothing. Goes to the Entry Point passing in the new parameters
#
#SwitchIplStacks PROC C \
# EntryPoint:PTR DWORD, \
# Parameter1:DWORD, \
# Parameter2:DWORD, \
# NewStack:PTR DWORD, \
# NewBsp:PTR DWORD
ASM_PFX(SwitchIplStacks):
push %ebp
mov %esp,%ebp
push %ebx
mov 0x18(%ebp),%eax
mov 0xc(%ebp),%ebx
mov 0x10(%ebp),%edx
mov 0x8(%ebp),%ecx
mov 0x14(%ebp),%eax
mov %eax,%esp
push %edx
push %ebx
call *%ecx
pop %ebx
leave
ret
#SwitchIplStacks ENDP
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