IntelFsp2Pkg: Locate FSP Info Header dynamically

[mirror_edk2.git] / IntelFsp2Pkg / FspSecCore / Ia32 / FspHelper.nasm

;; @file\r
;  Provide FSP helper function.\r
;\r
; Copyright (c) 2015 - 2016, Intel Corporation. All rights reserved.<BR>\r
; This program and the accompanying materials\r
; are licensed and made available under the terms and conditions of the BSD License\r
; which accompanies this distribution.  The full text of the license may be found at\r
; http://opensource.org/licenses/bsd-license.php.\r
;\r
; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
;;\r
\r
    SECTION .text\r
\r
global ASM_PFX(FspInfoHeaderRelativeOff)\r
\r
global ASM_PFX(AsmGetFspBaseAddress)\r
ASM_PFX(AsmGetFspBaseAddress):\r
   call  ASM_PFX(AsmGetFspInfoHeader)\r
   add   eax, 0x1C\r
   mov   eax, dword [eax]\r
   ret\r
\r
global ASM_PFX(AsmGetFspInfoHeader)\r
ASM_PFX(AsmGetFspInfoHeader):\r
   call  ASM_PFX(NextInstruction)\r
ASM_PFX(NextInstruction):\r
   pop   eax\r
   sub   eax, ASM_PFX(NextInstruction)\r
   add   eax, ASM_PFX(AsmGetFspInfoHeader)\r
   DB    02Dh                                               ; opcode of sub eax, imm32\r
ASM_PFX(FspInfoHeaderRelativeOff):    DD    0x12345678      ; sub eax, FspInfoHeaderRelativeOff\r
   ret\r