IntelFspPkg/FspSecCore add AsmGetFspBaseAddressNoStack and AsmGetFspInfoHeaderNoStack

[mirror_edk2.git] / IntelFspPkg / FspSecCore / Ia32 / FspHelper.asm

;; @file\r
;  Provide FSP helper function.\r
;\r
; Copyright (c) 2015, 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
    .586p\r
    .model  flat,C\r
    .code\r
\r
;\r
; FspInfoHeaderRelativeOff is patched during build process and initialized to offset of the  AsmGetFspBaseAddress \r
; from the FSP Info header. \r
;\r
FspInfoHeaderRelativeOff    PROC      NEAR    PUBLIC\r
   ;\r
   ; This value will be pached by the build script\r
   ;\r
   DD    012345678h\r
FspInfoHeaderRelativeOff    ENDP\r
\r
;\r
; Returns FSP Base Address. \r
;\r
; This function gets the FSP Info Header using relative addressing and returns the FSP Base from the header structure\r
;\r
AsmGetFspBaseAddress        PROC      NEAR    PUBLIC\r
   mov   eax, AsmGetFspBaseAddress\r
   sub   eax, dword ptr [FspInfoHeaderRelativeOff]\r
   add   eax, 01Ch\r
   mov   eax, dword ptr [eax]\r
   ret\r
AsmGetFspBaseAddress        ENDP\r
\r
;\r
; No stack counter part of AsmGetFspBaseAddress. Return address is in edi.\r
;\r
AsmGetFspBaseAddressNoStack    PROC      NEAR    PUBLIC\r
   mov   eax, AsmGetFspBaseAddress\r
   sub   eax, dword ptr [FspInfoHeaderRelativeOff]\r
   add   eax, 01Ch   \r
   mov   eax, dword ptr [eax]\r
   jmp   edi\r
AsmGetFspBaseAddressNoStack    ENDP\r
\r
;\r
; Returns FSP Info Header. \r
;\r
; This function gets the FSP Info Header using relative addressing and returns it\r
;\r
AsmGetFspInfoHeader         PROC      NEAR    PUBLIC\r
   mov   eax, AsmGetFspBaseAddress\r
   sub   eax, dword ptr [FspInfoHeaderRelativeOff]\r
   ret\r
AsmGetFspInfoHeader         ENDP\r
\r
;\r
; No stack counter part of AsmGetFspInfoHeader. Return address is in edi.\r
;\r
AsmGetFspInfoHeaderNoStack         PROC      NEAR    PUBLIC\r
   mov   eax, AsmGetFspBaseAddress\r
   sub   eax, dword ptr [FspInfoHeaderRelativeOff]\r
   jmp   edi\r
AsmGetFspInfoHeaderNoStack         ENDP\r
\r
     END