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[mirror_edk2.git] / UefiCpuPkg / ResetVector / Vtf0 / Ia32 / SearchForSecEntry.asm

;------------------------------------------------------------------------------\r
; @file\r
; Search for the SEC Core entry point\r
;\r
; Copyright (c) 2008 - 2009, Intel Corporation\r
; All rights reserved. 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
\r
BITS    32\r
\r
%define EFI_FV_FILETYPE_SECURITY_CORE         0x03\r
\r
;\r
; Modified:  EAX, EBX, ECX, EDX\r
; Preserved: EDI, EBP, ESP\r
;\r
; @param[in]   EBP  Address of Boot Firmware Volume (BFV)\r
; @param[out]  ESI  SEC Core Entry Point Address\r
;\r
Flat32SearchForSecEntryPoint:\r
\r
    ;\r
    ; Initialize EBP and ESI to 0\r
    ;\r
    xor     ebx, ebx\r
    mov     esi, ebx\r
\r
    ;\r
    ; Pass over the BFV header\r
    ;\r
    mov     eax, ebp\r
    mov     bx, [ebp + 0x30]\r
    add     eax, ebx\r
    jc      secEntryPointWasNotFound\r
\r
    jmp     searchingForFfsFileHeaderLoop\r
\r
moveForwardWhileSearchingForFfsFileHeaderLoop:\r
    ;\r
    ; Make forward progress in the search\r
    ;\r
    inc     eax\r
    jc      secEntryPointWasNotFound\r
\r
searchingForFfsFileHeaderLoop:\r
    test    eax, eax\r
    jz      secEntryPointWasNotFound\r
\r
    ;\r
    ; Ensure 8 byte alignment\r
    ;\r
    add     eax, 7\r
    jc      secEntryPointWasNotFound\r
    and     al, 0xf8\r
\r
    ;\r
    ; Look to see if there is an FFS file at eax\r
    ;\r
    mov     bl, [eax + 0x17]\r
    test    bl, 0x20\r
    jz      moveForwardWhileSearchingForFfsFileHeaderLoop\r
    mov     ecx, [eax + 0x14]\r
    and     ecx, 0x00ffffff\r
    or      ecx, ecx\r
    jz      moveForwardWhileSearchingForFfsFileHeaderLoop\r
    add     ecx, eax\r
    jz      jumpSinceWeFoundTheLastFfsFile\r
    jc      moveForwardWhileSearchingForFfsFileHeaderLoop\r
jumpSinceWeFoundTheLastFfsFile:\r
\r
    ;\r
    ; There seems to be a valid file at eax\r
    ;\r
    cmp     byte [eax + 0x12], EFI_FV_FILETYPE_SECURITY_CORE ; Check File Type\r
    jne     readyToTryFfsFileAtEcx\r
\r
fileTypeIsSecCore:\r
    OneTimeCall GetEntryPointOfFfsFile\r
    test    eax, eax\r
    jnz     doneSeachingForSecEntryPoint\r
\r
readyToTryFfsFileAtEcx:\r
    ;\r
    ; Try the next FFS file at ECX\r
    ;\r
    mov     eax, ecx\r
    jmp     searchingForFfsFileHeaderLoop\r
\r
secEntryPointWasNotFound:\r
    xor     eax, eax\r
\r
doneSeachingForSecEntryPoint:\r
    mov     esi, eax\r
\r
    test    esi, esi\r
    jnz     secCoreEntryPointWasFound\r
\r
secCoreEntryPointWasNotFound:\r
    ;\r
    ; Hang if the SEC entry point was not found\r
    ;\r
    debugShowPostCode POSTCODE_SEC_NOT_FOUND\r
    jz      $\r
\r
secCoreEntryPointWasFound:\r
    debugShowPostCode POSTCODE_SEC_FOUND\r
\r
    OneTimeCallRet Flat32SearchForSecEntryPoint\r
\r
%define EFI_SECTION_PE32                  0x10\r
\r
;\r
; Input:\r
;   EAX - Start of FFS file\r
;   ECX - End of FFS file\r
;\r
; Output:\r
;   EAX - Entry point of PE32 (or 0 if not found)\r
;\r
; Modified:\r
;   EBX\r
;\r
GetEntryPointOfFfsFile:\r
    test    eax, eax\r
    jz      getEntryPointOfFfsFileErrorReturn\r
    add     eax, 0x18       ; EAX = Start of section\r
\r
getEntryPointOfFfsFileLoopForSections:\r
    cmp     eax, ecx\r
    jae     getEntryPointOfFfsFileErrorReturn\r
\r
    cmp     byte [eax + 3], EFI_SECTION_PE32\r
    je      getEntryPointOfFfsFileFoundPe32Section\r
\r
    ;\r
    ; The section type was not PE32, so move to next section\r
    ;\r
    mov     ebx, dword [eax]\r
    and     ebx, 0x00ffffff\r
    add     eax, ebx\r
    jc      getEntryPointOfFfsFileErrorReturn\r
\r
    ;\r
    ; Ensure that FFS section is 32-bit aligned\r
    ;\r
    add     eax, 3\r
    jc      getEntryPointOfFfsFileErrorReturn\r
    and     al, 0xfc\r
    jmp     getEntryPointOfFfsFileLoopForSections\r
\r
getEntryPointOfFfsFileFoundPe32Section:\r
    add     eax, 4       ; EAX = Start of PE32 image\r
\r
    mov     ebx, eax\r
    cmp     word [eax], 'MZ'\r
    jne     thereIsNotAnMzSignature\r
    movzx   ebx, word [eax + 0x3c]\r
    add     ebx, eax\r
thereIsNotAnMzSignature:\r
\r
    ; if (Hdr.Te->Signature == EFI_TE_IMAGE_HEADER_SIGNATURE)\r
    cmp     word [ebx], 'VZ'\r
    jne     thereIsNoVzSignature\r
    ; *EntryPoint = (VOID *)((UINTN)Pe32Data +\r
    ;   (UINTN)(Hdr.Te->AddressOfEntryPoint & 0x0ffffffff) +\r
    ;   sizeof(EFI_TE_IMAGE_HEADER) - Hdr.Te->StrippedSize);\r
    add     eax, [ebx + 0x8]\r
    add     eax, 0x28\r
    movzx   ebx, word [ebx + 0x6]\r
    sub     eax, ebx\r
    jmp     getEntryPointOfFfsFileReturn\r
\r
thereIsNoVzSignature:\r
\r
    ; if (Hdr.Pe32->Signature == EFI_IMAGE_NT_SIGNATURE)\r
    cmp     dword [ebx], `PE\x00\x00`\r
    jne     getEntryPointOfFfsFileErrorReturn\r
\r
    ; *EntryPoint = (VOID *)((UINTN)Pe32Data +\r
    ;   (UINTN)(Hdr.Pe32->OptionalHeader.AddressOfEntryPoint & 0x0ffffffff));\r
    add     eax, [ebx + 0x4 + 0x14 + 0x10]\r
    jmp     getEntryPointOfFfsFileReturn\r
\r
getEntryPointOfFfsFileErrorReturn:\r
    mov     eax, 0\r
\r
getEntryPointOfFfsFileReturn:\r
    OneTimeCallRet GetEntryPointOfFfsFile\r
\r