MdeModulePkg/Core/DxeIplPeim/Ipf/ImageRead.c

   1 /** @file
   2   This module loads an image to memory for IPF Cpu architecture.
   3
   4 Copyright (c) 2006 - 2008, Intel Corporation. <BR>
   5 All rights reserved. This program and the accompanying materials
   6 are licensed and made available under the terms and conditions of the BSD License
   7 which accompanies this distribution.  The full text of the license may be found at
   8 http://opensource.org/licenses/bsd-license.php
   9
  10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #include "DxeIpl.h"
  16
  17
  18
  19 /**
  20   Support routine for the PE/COFF Loader that reads a buffer from a PE/COFF file
  21
  22   @param  FileHandle   The handle to the PE/COFF file
  23   @param  FileOffset   The offset, in bytes, into the file to read
  24   @param  ReadSize     The number of bytes to read from the file starting at
  25                        FileOffset
  26   @param  Buffer       A pointer to the buffer to read the data into.
  27
  28   @retval EFI_SUCCESS  ReadSize bytes of data were read into Buffer from the
  29                        PE/COFF file starting at FileOffset
  30
  31 **/
  32 EFI_STATUS
  33 PeiImageRead (
  34   IN     VOID    *FileHandle,
  35   IN     UINTN   FileOffset,
  36   IN OUT UINTN   *ReadSize,
  37   OUT    VOID    *Buffer
  38   )
  39 {
  40   CHAR8 *Destination8;
  41   CHAR8 *Source8;
  42   volatile UINTN Length;
  43
  44   Destination8  = Buffer;
  45   Source8       = (CHAR8 *) ((UINTN) FileHandle + FileOffset);
  46   Length        = *ReadSize;
  47   CopyMem (Destination8, Source8, Length);
  48
  49   return EFI_SUCCESS;
  50 }
  51
  52
  53 /**
  54    This function simply retrieves the function pointer of ImageRead in
  55    ImageContext structure.
  56
  57    @param ImageContext       A pointer to the structure of
  58                              PE_COFF_LOADER_IMAGE_CONTEXT
  59
  60    @retval EFI_SUCCESS       This function always return EFI_SUCCESS.
  61
  62 **/
  63 EFI_STATUS
  64 GetImageReadFunction (
  65   IN      PE_COFF_LOADER_IMAGE_CONTEXT  *ImageContext
  66   )
  67 {
  68   ImageContext->ImageRead = PeiImageRead;
  69   return EFI_SUCCESS;
  70 }