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1 | /*++\r | |
2 | \r | |
3 | Copyright (c) 2006, Intel Corporation \r | |
4 | All rights reserved. This program and the accompanying materials \r | |
5 | are licensed and made available under the terms and conditions of the BSD License \r | |
6 | which accompanies this distribution. The full text of the license may be found at \r | |
7 | http://opensource.org/licenses/bsd-license.php \r | |
8 | \r | |
9 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r | |
10 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r | |
11 | \r | |
12 | Module Name:\r | |
13 | \r | |
14 | ImageRead.c\r | |
15 | \r | |
16 | Abstract:\r | |
17 | \r | |
18 | --*/\r | |
19 | \r | |
20 | #include "DxeIpl.h"\r | |
21 | \r | |
22 | EFI_STATUS\r | |
23 | EFIAPI\r | |
24 | PeiImageRead (\r | |
25 | IN VOID *FileHandle,\r | |
26 | IN UINTN FileOffset,\r | |
27 | IN OUT UINTN *ReadSize,\r | |
28 | OUT VOID *Buffer\r | |
29 | )\r | |
30 | /*++\r | |
31 | \r | |
32 | Routine Description:\r | |
33 | \r | |
34 | Support routine for the PE/COFF Loader that reads a buffer from a PE/COFF file\r | |
35 | \r | |
36 | Arguments:\r | |
37 | \r | |
38 | FileHandle - The handle to the PE/COFF file\r | |
39 | \r | |
40 | FileOffset - The offset, in bytes, into the file to read\r | |
41 | \r | |
42 | ReadSize - The number of bytes to read from the file starting at FileOffset\r | |
43 | \r | |
44 | Buffer - A pointer to the buffer to read the data into.\r | |
45 | \r | |
46 | Returns:\r | |
47 | \r | |
48 | EFI_SUCCESS - ReadSize bytes of data were read into Buffer from the PE/COFF file starting at FileOffset\r | |
49 | \r | |
50 | --*/\r | |
51 | {\r | |
52 | UINT8 *Destination32;\r | |
53 | UINT8 *Source32;\r | |
54 | UINTN Length;\r | |
55 | \r | |
56 | \r | |
57 | Destination32 = Buffer;\r | |
58 | Source32 = (UINT8 *) ((UINTN) FileHandle + FileOffset);\r | |
59 | \r | |
60 | //\r | |
61 | // This function assumes 32-bit alignment to increase performance\r | |
62 | //\r | |
63 | // ASSERT (ALIGN_POINTER (Destination32, sizeof (UINT32)) == Destination32);\r | |
64 | // ASSERT (ALIGN_POINTER (Source32, sizeof (UINT32)) == Source32);\r | |
65 | \r | |
66 | Length = *ReadSize;\r | |
67 | while (Length--) {\r | |
68 | *(Destination32++) = *(Source32++);\r | |
69 | }\r | |
70 | \r | |
71 | return EFI_SUCCESS;\r | |
72 | }\r | |
73 | \r | |
74 | EFI_STATUS\r | |
75 | GetImageReadFunction (\r | |
76 | IN PE_COFF_LOADER_IMAGE_CONTEXT *ImageContext\r | |
77 | )\r | |
78 | /*++\r | |
79 | \r | |
80 | Routine Description:\r | |
81 | Support routine to return the PE32 Image Reader.\r | |
82 | If the PeiImageRead() function is less than a page\r | |
83 | in legnth. If the function is more than a page the DXE IPL will crash!!!!\r | |
84 | \r | |
85 | Arguments:\r | |
86 | ImageContext - The context of the image being loaded\r | |
87 | \r | |
88 | Returns:\r | |
89 | EFI_SUCCESS - If Image function location is found\r | |
90 | \r | |
91 | --*/\r | |
92 | {\r | |
93 | VOID *MemoryBuffer;\r | |
94 | \r | |
95 | if (gInMemory) {\r | |
96 | ImageContext->ImageRead = PeiImageRead;\r | |
97 | return EFI_SUCCESS;\r | |
98 | }\r | |
99 | \r | |
100 | //\r | |
101 | // BugBug; This code assumes PeiImageRead() is less than a page in size!\r | |
102 | // Allocate a page so we can shaddow the read function from FLASH into \r | |
103 | // memory to increase performance. \r | |
104 | //\r | |
105 | \r | |
106 | MemoryBuffer = AllocateCopyPool (0x400, (VOID *)(UINTN) PeiImageRead);\r | |
107 | ASSERT (MemoryBuffer != NULL);\r | |
108 | \r | |
109 | ImageContext->ImageRead = (PE_COFF_LOADER_READ_FILE) (UINTN) MemoryBuffer;\r | |
110 | \r | |
111 | return EFI_SUCCESS;\r | |
112 | }\r |