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ce2f5557 | 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 | Crc32.c\r | |
15 | \r | |
16 | Abstract:\r | |
17 | \r | |
18 | CalculateCrc32 Boot Services as defined in DXE CIS.\r | |
19 | \r | |
20 | This Boot Services is in the Runtime Driver because this service is\r | |
21 | also required by SetVirtualAddressMap() when the EFI System Table and\r | |
22 | EFI Runtime Services Table are converted from physical address to \r | |
23 | virtual addresses. This requires that the 32-bit CRC be recomputed.\r | |
24 | \r | |
25 | Revision History:\r | |
26 | \r | |
27 | --*/\r | |
28 | \r | |
29 | //\r | |
30 | // The package level header files this module uses\r | |
31 | //\r | |
32 | #include <PiDxe.h>\r | |
33 | \r | |
34 | UINT32 mCrcTable[256];\r | |
35 | \r | |
36 | EFI_STATUS\r | |
37 | EFIAPI\r | |
38 | RuntimeDriverCalculateCrc32 (\r | |
39 | IN VOID *Data,\r | |
40 | IN UINTN DataSize,\r | |
41 | OUT UINT32 *CrcOut\r | |
42 | )\r | |
43 | /*++\r | |
44 | \r | |
45 | Routine Description:\r | |
46 | \r | |
47 | Calculate CRC32 for target data\r | |
48 | \r | |
49 | Arguments:\r | |
50 | \r | |
51 | Data - The target data.\r | |
52 | DataSize - The target data size.\r | |
53 | CrcOut - The CRC32 for target data.\r | |
54 | \r | |
55 | Returns:\r | |
56 | \r | |
57 | EFI_SUCCESS - The CRC32 for target data is calculated successfully.\r | |
58 | EFI_INVALID_PARAMETER - Some parameter is not valid, so the CRC32 is not \r | |
59 | calculated.\r | |
60 | \r | |
61 | --*/\r | |
62 | {\r | |
63 | UINT32 Crc;\r | |
64 | UINTN Index;\r | |
65 | UINT8 *Ptr;\r | |
66 | \r | |
67 | if (Data == NULL || DataSize == 0 || CrcOut == NULL) {\r | |
68 | return EFI_INVALID_PARAMETER;\r | |
69 | }\r | |
70 | \r | |
71 | Crc = 0xffffffff;\r | |
72 | for (Index = 0, Ptr = Data; Index < DataSize; Index++, Ptr++) {\r | |
73 | Crc = (Crc >> 8) ^ mCrcTable[(UINT8) Crc ^ *Ptr];\r | |
74 | }\r | |
75 | \r | |
76 | *CrcOut = Crc ^ 0xffffffff;\r | |
77 | return EFI_SUCCESS;\r | |
78 | }\r | |
79 | \r | |
80 | STATIC\r | |
81 | UINT32\r | |
82 | ReverseBits (\r | |
83 | UINT32 Value\r | |
84 | )\r | |
85 | /*++\r | |
86 | \r | |
87 | Routine Description:\r | |
88 | \r | |
89 | Reverse bits for 32bit data.\r | |
90 | \r | |
91 | Arguments:\r | |
92 | \r | |
93 | Value - the data to be reversed.\r | |
94 | \r | |
95 | Returns:\r | |
96 | \r | |
97 | UINT32 data reversed.\r | |
98 | \r | |
99 | --*/\r | |
100 | {\r | |
101 | UINTN Index;\r | |
102 | UINT32 NewValue;\r | |
103 | \r | |
104 | NewValue = 0;\r | |
105 | for (Index = 0; Index < 32; Index++) {\r | |
106 | if (Value & (1 << Index)) {\r | |
107 | NewValue = NewValue | (1 << (31 - Index));\r | |
108 | }\r | |
109 | }\r | |
110 | \r | |
111 | return NewValue;\r | |
112 | }\r | |
113 | \r | |
114 | VOID\r | |
115 | RuntimeDriverInitializeCrc32Table (\r | |
116 | VOID\r | |
117 | )\r | |
118 | /*++\r | |
119 | \r | |
120 | Routine Description:\r | |
121 | \r | |
122 | Initialize CRC32 table.\r | |
123 | \r | |
124 | Arguments:\r | |
125 | \r | |
126 | None.\r | |
127 | \r | |
128 | Returns:\r | |
129 | \r | |
130 | None.\r | |
131 | \r | |
132 | --*/\r | |
133 | {\r | |
134 | UINTN TableEntry;\r | |
135 | UINTN Index;\r | |
136 | UINT32 Value;\r | |
137 | \r | |
138 | for (TableEntry = 0; TableEntry < 256; TableEntry++) {\r | |
139 | Value = ReverseBits ((UINT32) TableEntry);\r | |
140 | for (Index = 0; Index < 8; Index++) {\r | |
141 | if (Value & 0x80000000) {\r | |
142 | Value = (Value << 1) ^ 0x04c11db7;\r | |
143 | } else {\r | |
144 | Value = Value << 1;\r | |
145 | }\r | |
146 | }\r | |
147 | \r | |
148 | mCrcTable[TableEntry] = ReverseBits (Value);\r | |
149 | }\r | |
150 | }\r |