mirror of https://github.com/acidanthera/audk.git
89 lines
2.3 KiB
NASM
89 lines
2.3 KiB
NASM
;------------------------------------------------------------------------------
|
|
;
|
|
; Copyright (c) 2008, Intel Corporation
|
|
; All rights reserved. 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.
|
|
;
|
|
; Module Name:
|
|
;
|
|
; SearchForBfvBase.asm
|
|
;
|
|
; Abstract:
|
|
;
|
|
; Search for the Boot FV Base Address
|
|
;
|
|
;------------------------------------------------------------------------------
|
|
|
|
;#define EFI_FIRMWARE_FILE_SYSTEM2_GUID \
|
|
; { 0x8c8ce578, 0x8a3d, 0x4f1c, { 0x99, 0x35, 0x89, 0x61, 0x85, 0xc3, 0x2d, 0xd3 } }
|
|
%define FFS_GUID_DWORD0 0x8c8ce578
|
|
%define FFS_GUID_DWORD1 0x4f1c8a3d
|
|
%define FFS_GUID_DWORD2 0x61893599
|
|
%define FFS_GUID_DWORD3 0xd32dc385
|
|
|
|
BITS 32
|
|
|
|
;
|
|
; Input:
|
|
; None
|
|
;
|
|
; Output:
|
|
; EBP - BFV Base Address
|
|
;
|
|
; Modified:
|
|
; EAX, EBX
|
|
;
|
|
Flat32SearchForBfvBase:
|
|
|
|
xor eax, eax
|
|
searchingForBfvHeaderLoop:
|
|
sub eax, 0x1000
|
|
cmp eax, 0xff800000
|
|
jb searchedForBfvHeaderButNotFound
|
|
|
|
;
|
|
; Check FFS GUID
|
|
;
|
|
cmp dword [eax + 0x10], FFS_GUID_DWORD0
|
|
jne searchingForBfvHeaderLoop
|
|
cmp dword [eax + 0x14], FFS_GUID_DWORD1
|
|
jne searchingForBfvHeaderLoop
|
|
cmp dword [eax + 0x18], FFS_GUID_DWORD2
|
|
jne searchingForBfvHeaderLoop
|
|
cmp dword [eax + 0x1c], FFS_GUID_DWORD3
|
|
jne searchingForBfvHeaderLoop
|
|
|
|
;
|
|
; Check FV Length
|
|
;
|
|
cmp dword [eax + 0x24], 0
|
|
jne searchingForBfvHeaderLoop
|
|
mov ebx, eax
|
|
add ebx, dword [eax + 0x20]
|
|
jnz searchingForBfvHeaderLoop
|
|
|
|
jmp searchedForBfvHeaderAndItWasFound
|
|
|
|
searchedForBfvHeaderButNotFound:
|
|
writeToSerialPort '!'
|
|
xor eax, eax
|
|
|
|
searchedForBfvHeaderAndItWasFound:
|
|
mov ebp, eax
|
|
|
|
writeToSerialPort 'B'
|
|
writeToSerialPort 'F'
|
|
writeToSerialPort 'V'
|
|
writeToSerialPort ' '
|
|
|
|
or ebp, ebp
|
|
jz $
|
|
|
|
OneTimeCallRet Flat32SearchForBfvBase
|
|
|