Check in DxeCore for Nt32 platform. Currently, it does not follow PI/UEFI2.1.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@3045 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
yshang1
266
MdeModulePkg/Core/Dxe/FwVol/Ffs.c
Normal file
266
MdeModulePkg/Core/Dxe/FwVol/Ffs.c
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/*++
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Copyright (c) 2006, 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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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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Module Name:
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Ffs.c
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Abstract:
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FFS file access utilities.
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--*/
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#include <DxeMain.h>
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#define PHYSICAL_ADDRESS_TO_POINTER(Address) ((VOID *)((UINTN)(Address)))
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EFI_FFS_FILE_STATE
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GetFileState (
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IN UINT8 ErasePolarity,
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IN EFI_FFS_FILE_HEADER *FfsHeader
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)
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/*++
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Routine Description:
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Get the FFS file state by checking the highest bit set in the header's state field
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Arguments:
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ErasePolarity - Erase polarity attribute of the firmware volume
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FfsHeader - Points to the FFS file header
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Returns:
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FFS File state
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--*/
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{
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EFI_FFS_FILE_STATE FileState;
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UINT8 HighestBit;
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FileState = FfsHeader->State;
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if (ErasePolarity != 0) {
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FileState = (EFI_FFS_FILE_STATE)~FileState;
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}
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HighestBit = 0x80;
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while (HighestBit != 0 && ((HighestBit & FileState) == 0)) {
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HighestBit >>= 1;
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}
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return (EFI_FFS_FILE_STATE)HighestBit;
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}
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BOOLEAN
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IsBufferErased (
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IN UINT8 ErasePolarity,
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IN VOID *InBuffer,
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IN UINTN BufferSize
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)
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/*++
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Routine Description:
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Check if a block of buffer is erased
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Arguments:
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ErasePolarity - Erase polarity attribute of the firmware volume
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InBuffer - The buffer to be checked
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BufferSize - Size of the buffer in bytes
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Returns:
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TRUE - The block of buffer is erased
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FALSE - The block of buffer is not erased
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--*/
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{
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UINTN Count;
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UINT8 EraseByte;
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UINT8 *Buffer;
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if(ErasePolarity == 1) {
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EraseByte = 0xFF;
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} else {
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EraseByte = 0;
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}
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Buffer = InBuffer;
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for (Count = 0; Count < BufferSize; Count++) {
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if (Buffer[Count] != EraseByte) {
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return FALSE;
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}
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}
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return TRUE;
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}
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BOOLEAN
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VerifyFvHeaderChecksum (
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IN EFI_FIRMWARE_VOLUME_HEADER *FvHeader
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)
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/*++
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Routine Description:
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Verify checksum of the firmware volume header
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Arguments:
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FvHeader - Points to the firmware volume header to be checked
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Returns:
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TRUE - Checksum verification passed
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FALSE - Checksum verification failed
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--*/
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{
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UINT32 Index;
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UINT32 HeaderLength;
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UINT16 Checksum;
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UINT16 *ptr;
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HeaderLength = FvHeader->HeaderLength;
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ptr = (UINT16 *)FvHeader;
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Checksum = 0;
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for (Index = 0; Index < HeaderLength / sizeof (UINT16); Index++) {
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Checksum = (UINT16)(Checksum + ptr[Index]);
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}
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if (Checksum == 0) {
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return TRUE;
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} else {
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return FALSE;
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}
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}
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STATIC
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BOOLEAN
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VerifyHeaderChecksum (
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IN EFI_FFS_FILE_HEADER *FfsHeader
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)
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/*++
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Routine Description:
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Verify checksum of the FFS file header
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Arguments:
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FfsHeader - Points to the FFS file header to be checked
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Returns:
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TRUE - Checksum verification passed
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FALSE - Checksum verification failed
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--*/
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{
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UINT32 Index;
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UINT8 *ptr;
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UINT8 HeaderChecksum;
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ptr = (UINT8 *)FfsHeader;
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HeaderChecksum = 0;
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for (Index = 0; Index < sizeof(EFI_FFS_FILE_HEADER); Index++) {
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HeaderChecksum = (UINT8)(HeaderChecksum + ptr[Index]);
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}
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HeaderChecksum = (UINT8) (HeaderChecksum - FfsHeader->State - FfsHeader->IntegrityCheck.Checksum.File);
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if (HeaderChecksum == 0) {
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return TRUE;
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} else {
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return FALSE;
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}
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}
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BOOLEAN
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IsValidFfsHeader (
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IN UINT8 ErasePolarity,
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IN EFI_FFS_FILE_HEADER *FfsHeader,
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OUT EFI_FFS_FILE_STATE *FileState
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)
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/*++
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Routine Description:
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Check if it's a valid FFS file header
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Arguments:
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ErasePolarity - Erase polarity attribute of the firmware volume
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FfsHeader - Points to the FFS file header to be checked
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FileState - FFS file state to be returned
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Returns:
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TRUE - Valid FFS file header
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FALSE - Invalid FFS file header
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--*/
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{
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*FileState = GetFileState (ErasePolarity, FfsHeader);
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switch (*FileState) {
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case EFI_FILE_HEADER_VALID:
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case EFI_FILE_DATA_VALID:
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case EFI_FILE_MARKED_FOR_UPDATE:
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case EFI_FILE_DELETED:
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//
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// Here we need to verify header checksum
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//
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return VerifyHeaderChecksum (FfsHeader);
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case EFI_FILE_HEADER_CONSTRUCTION:
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case EFI_FILE_HEADER_INVALID:
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default:
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return FALSE;
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}
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}
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BOOLEAN
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IsValidFfsFile (
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IN UINT8 ErasePolarity,
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IN EFI_FFS_FILE_HEADER *FfsHeader
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)
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/*++
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Routine Description:
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Check if it's a valid FFS file.
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Here we are sure that it has a valid FFS file header since we must call IsValidFfsHeader() first.
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Arguments:
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ErasePolarity - Erase polarity attribute of the firmware volume
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FfsHeader - Points to the FFS file to be checked
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Returns:
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TRUE - Valid FFS file
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FALSE - Invalid FFS file
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--*/
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{
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EFI_FFS_FILE_STATE FileState;
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FileState = GetFileState (ErasePolarity, FfsHeader);
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switch (FileState) {
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case EFI_FILE_DELETED:
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case EFI_FILE_DATA_VALID:
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case EFI_FILE_MARKED_FOR_UPDATE:
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//
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// Some other vliadation like file content checksum might be done here.
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// For performance issue, Tiano only do FileState check.
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//
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return TRUE;
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default:
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return FALSE;
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}
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}
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