IntelFsp2Pkg/FspSecCore/Ia32/FspHelper.nasm

   1 ;; @file
   2 ;  Provide FSP helper function.
   3 ;
   4 ; Copyright (c) 2015 - 2016, Intel Corporation. All rights reserved.<BR>
   5 ; SPDX-License-Identifier: BSD-2-Clause-Patent
   6 ;;
   7
   8     SECTION .text
   9
  10 global ASM_PFX(FspInfoHeaderRelativeOff)
  11 ASM_PFX(FspInfoHeaderRelativeOff):
  12    DD    0x12345678               ; This value must be patched by the build script
  13
  14 global ASM_PFX(AsmGetFspBaseAddress)
  15 ASM_PFX(AsmGetFspBaseAddress):
  16    call  ASM_PFX(AsmGetFspInfoHeader)
  17    add   eax, 0x1C
  18    mov   eax, dword [eax]
  19    ret
  20
  21 global ASM_PFX(AsmGetFspInfoHeader)
  22 ASM_PFX(AsmGetFspInfoHeader):
  23    call  ASM_PFX(NextInstruction)
  24 ASM_PFX(NextInstruction):
  25    pop   eax
  26    sub   eax, ASM_PFX(NextInstruction)
  27    add   eax, ASM_PFX(AsmGetFspInfoHeader)
  28    sub   eax, dword [eax - ASM_PFX(AsmGetFspInfoHeader) + ASM_PFX(FspInfoHeaderRelativeOff)]
  29    ret
  30
  31 global ASM_PFX(AsmGetFspInfoHeaderNoStack)
  32 ASM_PFX(AsmGetFspInfoHeaderNoStack):
  33    mov   eax, ASM_PFX(AsmGetFspInfoHeader)
  34    sub   eax, dword [ASM_PFX(FspInfoHeaderRelativeOff)]
  35    jmp   edi