9b937a73b0
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5516 6f19259b-4bc3-4df7-8a09-765794883524
94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
/** @file
|
|
This module loads an image to memory for IA32 Cpu architecture.
|
|
|
|
Copyright (c) 2006 - 2008, Intel Corporation. <BR>
|
|
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.
|
|
|
|
**/
|
|
|
|
#include "DxeIpl.h"
|
|
|
|
/**
|
|
Support routine for the PE/COFF Loader that reads a buffer from a PE/COFF file
|
|
|
|
@param FileHandle The handle to the PE/COFF file
|
|
@param FileOffset The offset, in bytes, into the file to read
|
|
@param ReadSize The number of bytes to read from the file starting at
|
|
FileOffset
|
|
@param Buffer A pointer to the buffer to read the data into.
|
|
|
|
@retval EFI_SUCCESS ReadSize bytes of data were read into Buffer from the
|
|
PE/COFF file starting at FileOffset
|
|
|
|
**/
|
|
EFI_STATUS
|
|
PeiImageRead (
|
|
IN VOID *FileHandle,
|
|
IN UINTN FileOffset,
|
|
IN OUT UINTN *ReadSize,
|
|
OUT VOID *Buffer
|
|
)
|
|
{
|
|
UINT8 *Destination32;
|
|
UINT8 *Source32;
|
|
UINTN Length;
|
|
|
|
|
|
Destination32 = Buffer;
|
|
Source32 = (UINT8 *) ((UINTN) FileHandle + FileOffset);
|
|
|
|
//
|
|
// This function assumes 32-bit alignment to increase performance
|
|
//
|
|
|
|
Length = *ReadSize;
|
|
while (Length-- != 0) {
|
|
*(Destination32++) = *(Source32++);
|
|
}
|
|
|
|
return EFI_SUCCESS;
|
|
}
|
|
|
|
|
|
/**
|
|
This function simply retrieves the function pointer of ImageRead in
|
|
ImageContext structure.
|
|
|
|
@param ImageContext A pointer to the structure of
|
|
PE_COFF_LOADER_IMAGE_CONTEXT
|
|
|
|
@retval EFI_SUCCESS This function always returns EFI_SUCCESS.
|
|
|
|
**/
|
|
EFI_STATUS
|
|
GetImageReadFunction (
|
|
IN PE_COFF_LOADER_IMAGE_CONTEXT *ImageContext
|
|
)
|
|
{
|
|
VOID *MemoryBuffer;
|
|
|
|
if (gInMemory) {
|
|
ImageContext->ImageRead = PeiImageRead;
|
|
return EFI_SUCCESS;
|
|
}
|
|
|
|
//
|
|
// BugBug; This code assumes PeiImageRead() is less than a page in size!
|
|
// Allocate a page so we can shaddow the read function from FLASH into
|
|
// memory to increase performance.
|
|
//
|
|
|
|
MemoryBuffer = AllocateCopyPool (0x400, (VOID *)(UINTN) PeiImageRead);
|
|
ASSERT (MemoryBuffer != NULL);
|
|
|
|
ImageContext->ImageRead = (PE_COFF_LOADER_READ_FILE) (UINTN) MemoryBuffer;
|
|
|
|
return EFI_SUCCESS;
|
|
}
|