IntelFsp2Pkg/FspSecCore/X64/FspHelper.nasm

   1 ;; @file
   2 ;  Provide FSP helper function.
   3 ;
   4 ; Copyright (c) 2022, Intel Corporation. All rights reserved.<BR>
   5 ; SPDX-License-Identifier: BSD-2-Clause-Patent
   6 ;;
   7     DEFAULT  REL
   8     SECTION .text
   9
  10 global ASM_PFX(AsmGetFspBaseAddress)
  11 ASM_PFX(AsmGetFspBaseAddress):
  12    call  ASM_PFX(AsmGetFspInfoHeader)
  13    add   rax, 0x1C
  14    mov   eax, [rax]
  15    ret
  16
  17 global ASM_PFX(AsmGetFspInfoHeader)
  18 ASM_PFX(AsmGetFspInfoHeader):
  19    lea   rax, [ASM_PFX(AsmGetFspInfoHeader)]
  20    DB    0x48, 0x2d               ; sub rax, 0x????????
  21 global ASM_PFX(FspInfoHeaderRelativeOff)
  22 ASM_PFX(FspInfoHeaderRelativeOff):
  23    DD    0x12345678               ; This value must be patched by the build script
  24    and   rax, 0xffffffff
  25    ret
  26
  27 global ASM_PFX(AsmGetFspInfoHeaderNoStack)
  28 ASM_PFX(AsmGetFspInfoHeaderNoStack):
  29    lea   rax, [ASM_PFX(AsmGetFspInfoHeader)]
  30    lea   rcx, [ASM_PFX(FspInfoHeaderRelativeOff)]
  31    mov   ecx, [rcx]
  32    sub   rax, rcx
  33    and   rax, 0xffffffff
  34    jmp   rdi