mirror of https://github.com/acidanthera/audk.git
113 lines
3.0 KiB
C
113 lines
3.0 KiB
C
/*++
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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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ImageRead.c
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Abstract:
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--*/
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#include "DxeIpl.h"
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EFI_STATUS
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EFIAPI
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PeiImageRead (
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IN VOID *FileHandle,
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IN UINTN FileOffset,
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IN OUT UINTN *ReadSize,
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OUT VOID *Buffer
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)
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/*++
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Routine Description:
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Support routine for the PE/COFF Loader that reads a buffer from a PE/COFF file
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Arguments:
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FileHandle - The handle to the PE/COFF file
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FileOffset - The offset, in bytes, into the file to read
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ReadSize - The number of bytes to read from the file starting at FileOffset
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Buffer - A pointer to the buffer to read the data into.
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Returns:
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EFI_SUCCESS - ReadSize bytes of data were read into Buffer from the PE/COFF file starting at FileOffset
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--*/
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{
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UINT8 *Destination32;
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UINT8 *Source32;
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UINTN Length;
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Destination32 = Buffer;
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Source32 = (UINT8 *) ((UINTN) FileHandle + FileOffset);
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//
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// This function assumes 32-bit alignment to increase performance
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//
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// ASSERT (ALIGN_POINTER (Destination32, sizeof (UINT32)) == Destination32);
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// ASSERT (ALIGN_POINTER (Source32, sizeof (UINT32)) == Source32);
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Length = *ReadSize;
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while (Length--) {
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*(Destination32++) = *(Source32++);
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}
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return EFI_SUCCESS;
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}
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EFI_STATUS
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GetImageReadFunction (
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IN PE_COFF_LOADER_IMAGE_CONTEXT *ImageContext
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)
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/*++
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Routine Description:
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Support routine to return the PE32 Image Reader.
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If the PeiImageRead() function is less than a page
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in legnth. If the function is more than a page the DXE IPL will crash!!!!
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Arguments:
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ImageContext - The context of the image being loaded
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Returns:
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EFI_SUCCESS - If Image function location is found
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--*/
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{
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VOID *MemoryBuffer;
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if (gInMemory) {
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ImageContext->ImageRead = PeiImageRead;
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return EFI_SUCCESS;
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}
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//
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// BugBug; This code assumes PeiImageRead() is less than a page in size!
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// Allocate a page so we can shaddow the read function from FLASH into
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// memory to increase performance.
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//
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MemoryBuffer = AllocateCopyPool (0x400, (VOID *)(UINTN) PeiImageRead);
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ASSERT (MemoryBuffer != NULL);
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ImageContext->ImageRead = (PE_COFF_LOADER_READ_FILE) (UINTN) MemoryBuffer;
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return EFI_SUCCESS;
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}
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