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;
; Copyright (c) 2004, 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:
;
; ProcessorAsms.Asm
;
; Abstract:
; This is separated from processor.c to allow this functions to be built with /O1
;
; Notes:
; - Masm uses "This", "ebx", etc as a directive.
; - H2INC is still not embedded in our build process so I translated the struc manually.
; - Unreferenced variables/arguments (This, NewBsp, NewStack) were causing compile errors and
; did not know of "pragma" mechanism in MASM and I did not want to reduce the warning level.
; Instead, I did a dummy referenced.
;
.686P
.MMX
.MODEL SMALL
.CODE
EFI_SUCCESS equ 0
EFI_WARN_RETURN_FROM_LONG_JUMP equ 5
;
; Generated by h2inc run manually
;
_EFI_JUMP_BUFFER STRUCT 2t
_ebx DWORD ?
_esi DWORD ?
_edi DWORD ?
_ebp DWORD ?
_esp DWORD ?
_eip DWORD ?
_EFI_JUMP_BUFFER ENDS
EFI_JUMP_BUFFER TYPEDEF _EFI_JUMP_BUFFER
TransferControlSetJump PROTO C \
_This:PTR EFI_PEI_TRANSFER_CONTROL_PROTOCOL, \
Jump:PTR EFI_JUMP_BUFFER
TransferControlLongJump PROTO C \
_This:PTR EFI_PEI_TRANSFER_CONTROL_PROTOCOL, \
Jump:PTR EFI_JUMP_BUFFER
SwitchStacks PROTO C \
EntryPoint:PTR DWORD, \
Parameter:DWORD, \
NewStack:PTR DWORD, \
NewBsp:PTR DWORD
SwitchIplStacks PROTO C \
EntryPoint:PTR DWORD, \
Parameter1:DWORD, \
Parameter2:DWORD, \
NewStack:PTR DWORD, \
NewBsp:PTR DWORD
;
;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
;
TransferControlSetJump PROC C \
_This:PTR EFI_PEI_TRANSFER_CONTROL_PROTOCOL, \
Jump:PTR EFI_JUMP_BUFFER
mov eax, _This
mov ecx, Jump
mov (EFI_JUMP_BUFFER PTR [ecx])._ebx, ebx
mov (EFI_JUMP_BUFFER PTR [ecx])._esi, esi
mov (EFI_JUMP_BUFFER PTR [ecx])._edi, edi
mov eax, [ebp]
mov (EFI_JUMP_BUFFER PTR [ecx])._ebp, eax
lea eax, [ebp+4]
mov (EFI_JUMP_BUFFER PTR [ecx])._esp, eax
mov eax, [ebp+4]
mov (EFI_JUMP_BUFFER PTR [ecx])._eip, eax
mov eax, EFI_SUCCESS
ret
TransferControlSetJump ENDP
;
; 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
;
TransferControlLongJump PROC C \
_This:PTR EFI_PEI_TRANSFER_CONTROL_PROTOCOL, \
Jump:PTR EFI_JUMP_BUFFER
push ebx
push esi
push edi
mov eax, _This
; set return from SetJump to EFI_WARN_RETURN_FROM_LONG_JUMP
mov eax, EFI_WARN_RETURN_FROM_LONG_JUMP
mov ecx, Jump
mov ebx, (EFI_JUMP_BUFFER PTR [ecx])._ebx
mov esi, (EFI_JUMP_BUFFER PTR [ecx])._esi
mov edi, (EFI_JUMP_BUFFER PTR [ecx])._edi
mov ebp, (EFI_JUMP_BUFFER PTR [ecx])._ebp
mov esp, (EFI_JUMP_BUFFER PTR [ecx])._esp
add esp, 4 ;pop the eip
jmp DWORD PTR (EFI_JUMP_BUFFER PTR [ecx])._eip
mov eax, EFI_WARN_RETURN_FROM_LONG_JUMP
pop edi
pop esi
pop ebx
ret
TransferControlLongJump ENDP
;
; 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
push ebx
mov eax, NewBsp
mov ebx, Parameter
mov ecx, EntryPoint
mov eax, NewStack
mov esp, eax
push ebx
push 0
jmp ecx
pop ebx
ret
SwitchStacks ENDP
;
; 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
push ebx
mov eax, NewBsp
mov ebx, Parameter1
mov edx, Parameter2
mov ecx, EntryPoint
mov eax, NewStack
mov esp, eax
push edx
push ebx
call ecx
pop ebx
ret
SwitchIplStacks ENDP
END
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