+++ /dev/null
-/*++\r
-\r
-Copyright (c) 2006, 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
-Module Name:\r
-\r
- Ffs.c\r
-\r
-Abstract:\r
-\r
- FFS file access utilities.\r
-\r
---*/\r
-\r
-\r
-#include <DxeMain.h>\r
-\r
-#define PHYSICAL_ADDRESS_TO_POINTER(Address) ((VOID *)((UINTN)(Address)))\r
-\r
-\r
-EFI_FFS_FILE_STATE\r
-GetFileState (\r
- IN UINT8 ErasePolarity,\r
- IN EFI_FFS_FILE_HEADER *FfsHeader\r
- )\r
-/*++\r
-\r
-Routine Description:\r
- Get the FFS file state by checking the highest bit set in the header's state field\r
-\r
-Arguments:\r
- ErasePolarity - Erase polarity attribute of the firmware volume\r
- FfsHeader - Points to the FFS file header\r
- \r
-Returns:\r
- FFS File state \r
- \r
---*/\r
-{\r
- EFI_FFS_FILE_STATE FileState;\r
- UINT8 HighestBit;\r
-\r
- FileState = FfsHeader->State;\r
-\r
- if (ErasePolarity != 0) {\r
- FileState = (EFI_FFS_FILE_STATE)~FileState;\r
- }\r
-\r
- HighestBit = 0x80;\r
- while (HighestBit != 0 && ((HighestBit & FileState) == 0)) {\r
- HighestBit >>= 1;\r
- }\r
-\r
- return (EFI_FFS_FILE_STATE)HighestBit;\r
-}\r
-\r
-\r
-BOOLEAN\r
-IsBufferErased (\r
- IN UINT8 ErasePolarity,\r
- IN VOID *InBuffer,\r
- IN UINTN BufferSize\r
- )\r
-/*++\r
-\r
-Routine Description:\r
- Check if a block of buffer is erased\r
-\r
-Arguments:\r
- ErasePolarity - Erase polarity attribute of the firmware volume\r
- InBuffer - The buffer to be checked\r
- BufferSize - Size of the buffer in bytes\r
- \r
-Returns:\r
- TRUE - The block of buffer is erased\r
- FALSE - The block of buffer is not erased\r
- \r
---*/\r
-{\r
- UINTN Count;\r
- UINT8 EraseByte;\r
- UINT8 *Buffer;\r
-\r
- if(ErasePolarity == 1) {\r
- EraseByte = 0xFF;\r
- } else {\r
- EraseByte = 0;\r
- }\r
-\r
- Buffer = InBuffer;\r
- for (Count = 0; Count < BufferSize; Count++) {\r
- if (Buffer[Count] != EraseByte) {\r
- return FALSE;\r
- }\r
- }\r
-\r
- return TRUE;\r
-}\r
-\r
-\r
-BOOLEAN\r
-VerifyFvHeaderChecksum (\r
- IN EFI_FIRMWARE_VOLUME_HEADER *FvHeader\r
- )\r
-/*++\r
-\r
-Routine Description:\r
- Verify checksum of the firmware volume header \r
-\r
-Arguments:\r
- FvHeader - Points to the firmware volume header to be checked\r
- \r
-Returns:\r
- TRUE - Checksum verification passed\r
- FALSE - Checksum verification failed\r
- \r
---*/\r
-{\r
- UINT32 Index;\r
- UINT32 HeaderLength;\r
- UINT16 Checksum;\r
- UINT16 *ptr;\r
-\r
- HeaderLength = FvHeader->HeaderLength;\r
- ptr = (UINT16 *)FvHeader;\r
- Checksum = 0;\r
-\r
- for (Index = 0; Index < HeaderLength / sizeof (UINT16); Index++) {\r
- Checksum = (UINT16)(Checksum + ptr[Index]);\r
- }\r
-\r
- if (Checksum == 0) {\r
- return TRUE;\r
- } else {\r
- return FALSE;\r
- }\r
-}\r
-\r
-STATIC\r
-BOOLEAN\r
-VerifyHeaderChecksum (\r
- IN EFI_FFS_FILE_HEADER *FfsHeader\r
- )\r
-/*++\r
-\r
-Routine Description:\r
- Verify checksum of the FFS file header \r
-\r
-Arguments:\r
- FfsHeader - Points to the FFS file header to be checked\r
- \r
-Returns:\r
- TRUE - Checksum verification passed\r
- FALSE - Checksum verification failed\r
- \r
---*/\r
-{\r
- UINT32 Index;\r
- UINT8 *ptr;\r
- UINT8 HeaderChecksum;\r
-\r
- ptr = (UINT8 *)FfsHeader;\r
- HeaderChecksum = 0;\r
- for (Index = 0; Index < sizeof(EFI_FFS_FILE_HEADER); Index++) {\r
- HeaderChecksum = (UINT8)(HeaderChecksum + ptr[Index]);\r
- }\r
-\r
- HeaderChecksum = (UINT8) (HeaderChecksum - FfsHeader->State - FfsHeader->IntegrityCheck.Checksum.File);\r
-\r
- if (HeaderChecksum == 0) {\r
- return TRUE;\r
- } else {\r
- return FALSE;\r
- }\r
-}\r
-\r
-\r
-BOOLEAN\r
-IsValidFfsHeader (\r
- IN UINT8 ErasePolarity,\r
- IN EFI_FFS_FILE_HEADER *FfsHeader,\r
- OUT EFI_FFS_FILE_STATE *FileState\r
- )\r
-/*++\r
-\r
-Routine Description:\r
- Check if it's a valid FFS file header\r
-\r
-Arguments:\r
- ErasePolarity - Erase polarity attribute of the firmware volume\r
- FfsHeader - Points to the FFS file header to be checked\r
- FileState - FFS file state to be returned\r
- \r
-Returns:\r
- TRUE - Valid FFS file header\r
- FALSE - Invalid FFS file header\r
- \r
---*/\r
-{\r
- *FileState = GetFileState (ErasePolarity, FfsHeader);\r
-\r
- switch (*FileState) {\r
- case EFI_FILE_HEADER_VALID:\r
- case EFI_FILE_DATA_VALID:\r
- case EFI_FILE_MARKED_FOR_UPDATE:\r
- case EFI_FILE_DELETED:\r
- //\r
- // Here we need to verify header checksum\r
- //\r
- return VerifyHeaderChecksum (FfsHeader);\r
- \r
- case EFI_FILE_HEADER_CONSTRUCTION:\r
- case EFI_FILE_HEADER_INVALID:\r
- default:\r
- return FALSE;\r
- }\r
-}\r
-\r
-\r
-BOOLEAN\r
-IsValidFfsFile (\r
- IN UINT8 ErasePolarity,\r
- IN EFI_FFS_FILE_HEADER *FfsHeader\r
- )\r
-/*++\r
-\r
-Routine Description:\r
- Check if it's a valid FFS file. \r
- Here we are sure that it has a valid FFS file header since we must call IsValidFfsHeader() first.\r
-\r
-Arguments:\r
- ErasePolarity - Erase polarity attribute of the firmware volume\r
- FfsHeader - Points to the FFS file to be checked\r
- \r
-Returns:\r
- TRUE - Valid FFS file\r
- FALSE - Invalid FFS file\r
- \r
---*/\r
-{\r
- EFI_FFS_FILE_STATE FileState;\r
-\r
- FileState = GetFileState (ErasePolarity, FfsHeader);\r
- switch (FileState) {\r
-\r
- case EFI_FILE_DELETED:\r
- case EFI_FILE_DATA_VALID:\r
- case EFI_FILE_MARKED_FOR_UPDATE:\r
- //\r
- // Some other vliadation like file content checksum might be done here.\r
- // For performance issue, Tiano only do FileState check.\r
- //\r
- return TRUE;\r
-\r
- default:\r
- return FALSE;\r
- }\r
-}\r
-\r
projects / mirror_edk2.git / blobdiff