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/*++
Copyright (c) 2006, Intel Corporation
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.
Module Name:
ImageRead.c
Abstract:
--*/
#include "DxeIpl.h"
EFI_STATUS
EFIAPI
PeiImageRead (
IN VOID *FileHandle,
IN UINTN FileOffset,
IN OUT UINTN *ReadSize,
OUT VOID *Buffer
)
/*++
Routine Description:
Support routine for the PE/COFF Loader that reads a buffer from a PE/COFF file
Arguments:
FileHandle - The handle to the PE/COFF file
FileOffset - The offset, in bytes, into the file to read
ReadSize - The number of bytes to read from the file starting at FileOffset
Buffer - A pointer to the buffer to read the data into.
Returns:
EFI_SUCCESS - ReadSize bytes of data were read into Buffer from the PE/COFF file starting at FileOffset
--*/
{
UINT8 *Destination32;
UINT8 *Source32;
UINTN Length;
Destination32 = Buffer;
Source32 = (UINT8 *) ((UINTN) FileHandle + FileOffset);
//
// This function assumes 32-bit alignment to increase performance
//
// ASSERT (ALIGN_POINTER (Destination32, sizeof (UINT32)) == Destination32);
// ASSERT (ALIGN_POINTER (Source32, sizeof (UINT32)) == Source32);
Length = *ReadSize;
while (Length--) {
*(Destination32++) = *(Source32++);
}
return EFI_SUCCESS;
}
EFI_STATUS
GetImageReadFunction (
IN PE_COFF_LOADER_IMAGE_CONTEXT *ImageContext
)
/*++
Routine Description:
Support routine to return the PE32 Image Reader.
If the PeiImageRead() function is less than a page
in legnth. If the function is more than a page the DXE IPL will crash!!!!
Arguments:
ImageContext - The context of the image being loaded
Returns:
EFI_SUCCESS - If Image function location is found
--*/
{
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;
}
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