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504214c4 | 1 | /** @file \r |
28a00297 | 2 | \r |
504214c4 LG |
3 | FFS file access utilities.\r |
4 | \r | |
5 | Copyright (c) 2006 - 2008, Intel Corporation \r | |
28a00297 | 6 | All rights reserved. This program and the accompanying materials \r |
7 | are licensed and made available under the terms and conditions of the BSD License \r | |
8 | which accompanies this distribution. The full text of the license may be found at \r | |
9 | http://opensource.org/licenses/bsd-license.php \r | |
10 | \r | |
11 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r | |
12 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r | |
13 | \r | |
504214c4 | 14 | **/\r |
28a00297 | 15 | \r |
16 | \r | |
17 | #include <DxeMain.h>\r | |
18 | \r | |
19 | #define PHYSICAL_ADDRESS_TO_POINTER(Address) ((VOID *)((UINTN)(Address)))\r | |
20 | \r | |
21 | \r | |
162ed594 | 22 | /**\r |
23 | Get the FFS file state by checking the highest bit set in the header's state field.\r | |
24 | \r | |
25 | @param ErasePolarity Erase polarity attribute of the firmware volume \r | |
26 | @param FfsHeader Points to the FFS file header \r | |
27 | \r | |
28 | @return FFS File state\r | |
29 | \r | |
30 | **/\r | |
28a00297 | 31 | EFI_FFS_FILE_STATE\r |
32 | GetFileState (\r | |
33 | IN UINT8 ErasePolarity,\r | |
34 | IN EFI_FFS_FILE_HEADER *FfsHeader\r | |
35 | )\r | |
28a00297 | 36 | {\r |
37 | EFI_FFS_FILE_STATE FileState;\r | |
38 | UINT8 HighestBit;\r | |
39 | \r | |
40 | FileState = FfsHeader->State;\r | |
41 | \r | |
42 | if (ErasePolarity != 0) {\r | |
43 | FileState = (EFI_FFS_FILE_STATE)~FileState;\r | |
44 | }\r | |
45 | \r | |
46 | HighestBit = 0x80;\r | |
47 | while (HighestBit != 0 && ((HighestBit & FileState) == 0)) {\r | |
48 | HighestBit >>= 1;\r | |
49 | }\r | |
50 | \r | |
51 | return (EFI_FFS_FILE_STATE)HighestBit;\r | |
52 | }\r | |
53 | \r | |
54 | \r | |
162ed594 | 55 | \r |
56 | /**\r | |
57 | Check if a block of buffer is erased.\r | |
58 | \r | |
59 | @param ErasePolarity Erase polarity attribute of the firmware volume \r | |
60 | @param InBuffer The buffer to be checked \r | |
61 | @param BufferSize Size of the buffer in bytes \r | |
62 | \r | |
63 | @retval TRUE The block of buffer is erased \r | |
64 | @retval FALSE The block of buffer is not erased\r | |
65 | \r | |
66 | **/\r | |
28a00297 | 67 | BOOLEAN\r |
68 | IsBufferErased (\r | |
69 | IN UINT8 ErasePolarity,\r | |
70 | IN VOID *InBuffer,\r | |
71 | IN UINTN BufferSize\r | |
72 | )\r | |
28a00297 | 73 | {\r |
74 | UINTN Count;\r | |
75 | UINT8 EraseByte;\r | |
76 | UINT8 *Buffer;\r | |
77 | \r | |
78 | if(ErasePolarity == 1) {\r | |
79 | EraseByte = 0xFF;\r | |
80 | } else {\r | |
81 | EraseByte = 0;\r | |
82 | }\r | |
83 | \r | |
84 | Buffer = InBuffer;\r | |
85 | for (Count = 0; Count < BufferSize; Count++) {\r | |
86 | if (Buffer[Count] != EraseByte) {\r | |
87 | return FALSE;\r | |
88 | }\r | |
89 | }\r | |
90 | \r | |
91 | return TRUE;\r | |
92 | }\r | |
93 | \r | |
94 | \r | |
162ed594 | 95 | \r |
96 | /**\r | |
97 | Verify checksum of the firmware volume header.\r | |
98 | \r | |
99 | @param FvHeader Points to the firmware volume header to be checked \r | |
100 | \r | |
101 | @retval TRUE Checksum verification passed \r | |
102 | @retval FALSE Checksum verification failed\r | |
103 | \r | |
104 | **/\r | |
28a00297 | 105 | BOOLEAN\r |
106 | VerifyFvHeaderChecksum (\r | |
107 | IN EFI_FIRMWARE_VOLUME_HEADER *FvHeader\r | |
108 | )\r | |
28a00297 | 109 | {\r |
110 | UINT32 Index;\r | |
111 | UINT32 HeaderLength;\r | |
112 | UINT16 Checksum;\r | |
162ed594 | 113 | UINT16 *Ptr;\r |
28a00297 | 114 | \r |
115 | HeaderLength = FvHeader->HeaderLength;\r | |
162ed594 | 116 | Ptr = (UINT16 *)FvHeader;\r |
28a00297 | 117 | Checksum = 0;\r |
118 | \r | |
119 | for (Index = 0; Index < HeaderLength / sizeof (UINT16); Index++) {\r | |
162ed594 | 120 | Checksum = (UINT16)(Checksum + Ptr[Index]);\r |
28a00297 | 121 | }\r |
122 | \r | |
123 | if (Checksum == 0) {\r | |
124 | return TRUE;\r | |
125 | } else {\r | |
126 | return FALSE;\r | |
127 | }\r | |
128 | }\r | |
129 | \r | |
162ed594 | 130 | \r |
131 | /**\r | |
132 | Verify checksum of the FFS file header.\r | |
133 | \r | |
134 | @param FfsHeader Points to the FFS file header to be checked \r | |
135 | \r | |
136 | @retval TRUE Checksum verification passed \r | |
137 | @retval FALSE Checksum verification failed\r | |
138 | \r | |
139 | **/\r | |
28a00297 | 140 | STATIC\r |
141 | BOOLEAN\r | |
142 | VerifyHeaderChecksum (\r | |
143 | IN EFI_FFS_FILE_HEADER *FfsHeader\r | |
144 | )\r | |
28a00297 | 145 | {\r |
146 | UINT32 Index;\r | |
162ed594 | 147 | UINT8 *Ptr;\r |
28a00297 | 148 | UINT8 HeaderChecksum;\r |
149 | \r | |
162ed594 | 150 | Ptr = (UINT8 *)FfsHeader;\r |
28a00297 | 151 | HeaderChecksum = 0;\r |
152 | for (Index = 0; Index < sizeof(EFI_FFS_FILE_HEADER); Index++) {\r | |
162ed594 | 153 | HeaderChecksum = (UINT8)(HeaderChecksum + Ptr[Index]);\r |
28a00297 | 154 | }\r |
155 | \r | |
156 | HeaderChecksum = (UINT8) (HeaderChecksum - FfsHeader->State - FfsHeader->IntegrityCheck.Checksum.File);\r | |
157 | \r | |
158 | if (HeaderChecksum == 0) {\r | |
159 | return TRUE;\r | |
160 | } else {\r | |
161 | return FALSE;\r | |
162 | }\r | |
163 | }\r | |
164 | \r | |
165 | \r | |
162ed594 | 166 | \r |
167 | /**\r | |
168 | Check if it's a valid FFS file header.\r | |
169 | \r | |
170 | @param ErasePolarity Erase polarity attribute of the firmware volume \r | |
171 | @param FfsHeader Points to the FFS file header to be checked \r | |
172 | @param FileState FFS file state to be returned \r | |
173 | \r | |
174 | @retval TRUE Valid FFS file header \r | |
175 | @retval FALSE Invalid FFS file header\r | |
176 | \r | |
177 | **/\r | |
28a00297 | 178 | BOOLEAN\r |
179 | IsValidFfsHeader (\r | |
180 | IN UINT8 ErasePolarity,\r | |
181 | IN EFI_FFS_FILE_HEADER *FfsHeader,\r | |
182 | OUT EFI_FFS_FILE_STATE *FileState\r | |
183 | )\r | |
28a00297 | 184 | {\r |
185 | *FileState = GetFileState (ErasePolarity, FfsHeader);\r | |
186 | \r | |
187 | switch (*FileState) {\r | |
188 | case EFI_FILE_HEADER_VALID:\r | |
189 | case EFI_FILE_DATA_VALID:\r | |
190 | case EFI_FILE_MARKED_FOR_UPDATE:\r | |
191 | case EFI_FILE_DELETED:\r | |
192 | //\r | |
193 | // Here we need to verify header checksum\r | |
194 | //\r | |
195 | return VerifyHeaderChecksum (FfsHeader);\r | |
196 | \r | |
197 | case EFI_FILE_HEADER_CONSTRUCTION:\r | |
198 | case EFI_FILE_HEADER_INVALID:\r | |
199 | default:\r | |
200 | return FALSE;\r | |
201 | }\r | |
202 | }\r | |
203 | \r | |
204 | \r | |
162ed594 | 205 | \r |
206 | /**\r | |
207 | Check if it's a valid FFS file.\r | |
208 | Here we are sure that it has a valid FFS file header since we must call IsValidFfsHeader() first.\r | |
209 | \r | |
210 | @param ErasePolarity Erase polarity attribute of the firmware volume \r | |
211 | @param FfsHeader Points to the FFS file to be checked \r | |
212 | \r | |
213 | @retval TRUE Valid FFS file \r | |
214 | @retval FALSE Invalid FFS file\r | |
215 | \r | |
216 | **/\r | |
28a00297 | 217 | BOOLEAN\r |
218 | IsValidFfsFile (\r | |
219 | IN UINT8 ErasePolarity,\r | |
220 | IN EFI_FFS_FILE_HEADER *FfsHeader\r | |
221 | )\r | |
28a00297 | 222 | {\r |
223 | EFI_FFS_FILE_STATE FileState;\r | |
224 | \r | |
225 | FileState = GetFileState (ErasePolarity, FfsHeader);\r | |
226 | switch (FileState) {\r | |
227 | \r | |
228 | case EFI_FILE_DELETED:\r | |
229 | case EFI_FILE_DATA_VALID:\r | |
230 | case EFI_FILE_MARKED_FOR_UPDATE:\r | |
231 | //\r | |
232 | // Some other vliadation like file content checksum might be done here.\r | |
233 | // For performance issue, Tiano only do FileState check.\r | |
234 | //\r | |
235 | return TRUE;\r | |
236 | \r | |
237 | default:\r | |
238 | return FALSE;\r | |
239 | }\r | |
240 | }\r | |
241 | \r | |
162ed594 | 242 | \r |