audk/IntelFsp2Pkg/FspSecCore/Ia32/FspHelper.nasm

;; @file
;  Provide FSP helper function.
;
; Copyright (c) 2015 - 2016, 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.
;;

    SECTION .text

global ASM_PFX(FspInfoHeaderRelativeOff)

global ASM_PFX(AsmGetFspBaseAddress)
ASM_PFX(AsmGetFspBaseAddress):
   call  ASM_PFX(AsmGetFspInfoHeader)
   add   eax, 0x1C
   mov   eax, dword [eax]
   ret

global ASM_PFX(AsmGetFspInfoHeader)
ASM_PFX(AsmGetFspInfoHeader):
   call  ASM_PFX(NextInstruction)
ASM_PFX(NextInstruction):
   pop   eax
   sub   eax, ASM_PFX(NextInstruction)
   add   eax, ASM_PFX(AsmGetFspInfoHeader)
   DB    02Dh                                               ; opcode of sub eax, imm32
ASM_PFX(FspInfoHeaderRelativeOff):    DD    0x12345678      ; sub eax, FspInfoHeaderRelativeOff
   ret