mirror of https://github.com/acidanthera/audk.git
89 lines
2.3 KiB
NASM
89 lines
2.3 KiB
NASM
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;------------------------------------------------------------------------------
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;
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; Copyright (c) 2008, Intel Corporation
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; All rights reserved. This program and the accompanying materials
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; are licensed and made available under the terms and conditions of the BSD License
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; which accompanies this distribution. The full text of the license may be found at
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; http://opensource.org/licenses/bsd-license.php
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;
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; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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;
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; Module Name:
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;
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; SearchForBfvBase.asm
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;
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; Abstract:
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;
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; Search for the Boot FV Base Address
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;
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;------------------------------------------------------------------------------
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;#define EFI_FIRMWARE_FILE_SYSTEM2_GUID \
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; { 0x8c8ce578, 0x8a3d, 0x4f1c, { 0x99, 0x35, 0x89, 0x61, 0x85, 0xc3, 0x2d, 0xd3 } }
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%define FFS_GUID_DWORD0 0x8c8ce578
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%define FFS_GUID_DWORD1 0x4f1c8a3d
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%define FFS_GUID_DWORD2 0x61893599
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%define FFS_GUID_DWORD3 0xd32dc385
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BITS 32
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;
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; Input:
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; None
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;
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; Output:
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; EBP - BFV Base Address
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;
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; Modified:
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; EAX, EBX
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;
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Flat32SearchForBfvBase:
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xor eax, eax
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searchingForBfvHeaderLoop:
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sub eax, 0x1000
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cmp eax, 0xff800000
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jb searchedForBfvHeaderButNotFound
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;
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; Check FFS GUID
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;
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cmp dword [eax + 0x10], FFS_GUID_DWORD0
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jne searchingForBfvHeaderLoop
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cmp dword [eax + 0x14], FFS_GUID_DWORD1
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jne searchingForBfvHeaderLoop
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cmp dword [eax + 0x18], FFS_GUID_DWORD2
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jne searchingForBfvHeaderLoop
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cmp dword [eax + 0x1c], FFS_GUID_DWORD3
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jne searchingForBfvHeaderLoop
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;
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; Check FV Length
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;
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cmp dword [eax + 0x24], 0
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jne searchingForBfvHeaderLoop
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mov ebx, eax
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add ebx, dword [eax + 0x20]
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jnz searchingForBfvHeaderLoop
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jmp searchedForBfvHeaderAndItWasFound
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searchedForBfvHeaderButNotFound:
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writeToSerialPort '!'
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xor eax, eax
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searchedForBfvHeaderAndItWasFound:
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mov ebp, eax
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writeToSerialPort 'B'
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writeToSerialPort 'F'
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writeToSerialPort 'V'
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writeToSerialPort ' '
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or ebp, ebp
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jz $
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OneTimeCallRet Flat32SearchForBfvBase
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