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;------------------------------------------------------------------------------
;
; Copyright (c) 2010, 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:
;
; PageFaultHandler.asm
;
; Abstract:
;
; Defines page fault handler used to hook SMM IDT
;
;------------------------------------------------------------------------------
EXTERN mOriginalHandler:QWORD
EXTERN PageFaultHandler:PROC
.code
PageFaultHandlerHook PROC
push rax ; save all volatile registers
push rcx
push rdx
push r8
push r9
push r10
push r11
add rsp, -20h
call PageFaultHandler
add rsp, 20h
test rax, rax
pop r11
pop r10
pop r9
pop r8
pop rdx
pop rcx
pop rax ; restore all volatile registers
jnz @F
jmp mOriginalHandler
@@:
add rsp, 08h ; skip error code for PF
iretq
PageFaultHandlerHook ENDP
END
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