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fb0b259e | 1 | /** @file\r |
2 | CalculateCrc32 Boot Services as defined in DXE CIS.\r | |
3 | \r | |
9920ae74 | 4 | This Boot Services is in the Runtime Driver because this service is\r |
5 | also required by SetVirtualAddressMap() when the EFI System Table and\r | |
6 | EFI Runtime Services Table are converted from physical address to\r | |
7 | virtual addresses. This requires that the 32-bit CRC be recomputed.\r | |
8 | \r | |
fb0b259e | 9 | Copyright (c) 2006, Intel Corporation. <BR>\r |
10 | All rights reserved. This program and the accompanying materials\r | |
11 | are licensed and made available under the terms and conditions of the BSD License\r | |
12 | which accompanies this distribution. The full text of the license may be found at\r | |
13 | http://opensource.org/licenses/bsd-license.php\r | |
f2abdc91 | 14 | \r |
fb0b259e | 15 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r |
16 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
f2abdc91 | 17 | \r |
fb0b259e | 18 | **/\r |
f2abdc91 | 19 | \r |
ed7748fe | 20 | \r |
f2abdc91 | 21 | #include <PiDxe.h>\r |
22 | \r | |
23 | UINT32 mCrcTable[256];\r | |
24 | \r | |
fb0b259e | 25 | /**\r |
26 | Calculate CRC32 for target data.\r | |
27 | \r | |
9fc78752 | 28 | @param Data The target data.\r |
fb0b259e | 29 | @param DataSize The target data size.\r |
30 | @param CrcOut The CRC32 for target data.\r | |
31 | \r | |
32 | @retval EFI_SUCCESS The CRC32 for target data is calculated successfully.\r | |
33 | @retval EFI_INVALID_PARAMETER Some parameter is not valid, so the CRC32 is not\r | |
34 | calculated.\r | |
35 | \r | |
36 | **/\r | |
f2abdc91 | 37 | EFI_STATUS\r |
38 | EFIAPI\r | |
39 | RuntimeDriverCalculateCrc32 (\r | |
40 | IN VOID *Data,\r | |
41 | IN UINTN DataSize,\r | |
42 | OUT UINT32 *CrcOut\r | |
43 | )\r | |
f2abdc91 | 44 | {\r |
45 | UINT32 Crc;\r | |
46 | UINTN Index;\r | |
47 | UINT8 *Ptr;\r | |
48 | \r | |
49 | if (Data == NULL || DataSize == 0 || CrcOut == NULL) {\r | |
50 | return EFI_INVALID_PARAMETER;\r | |
51 | }\r | |
52 | \r | |
53 | Crc = 0xffffffff;\r | |
54 | for (Index = 0, Ptr = Data; Index < DataSize; Index++, Ptr++) {\r | |
55 | Crc = (Crc >> 8) ^ mCrcTable[(UINT8) Crc ^ *Ptr];\r | |
56 | }\r | |
57 | \r | |
58 | *CrcOut = Crc ^ 0xffffffff;\r | |
59 | return EFI_SUCCESS;\r | |
60 | }\r | |
61 | \r | |
f2abdc91 | 62 | \r |
fb0b259e | 63 | /**\r |
f2abdc91 | 64 | Reverse bits for 32bit data.\r |
9fc78752 | 65 | This is a internal function.\r |
f2abdc91 | 66 | \r |
fb0b259e | 67 | @param Value The data to be reversed.\r |
f2abdc91 | 68 | \r |
9fc78752 | 69 | @return Data reversed.\r |
f2abdc91 | 70 | \r |
fb0b259e | 71 | **/\r |
fb0b259e | 72 | UINT32\r |
73 | ReverseBits (\r | |
74 | UINT32 Value\r | |
75 | )\r | |
f2abdc91 | 76 | {\r |
77 | UINTN Index;\r | |
78 | UINT32 NewValue;\r | |
79 | \r | |
80 | NewValue = 0;\r | |
81 | for (Index = 0; Index < 32; Index++) {\r | |
9fc78752 | 82 | if ((Value & (1 << Index)) != 0) {\r |
f2abdc91 | 83 | NewValue = NewValue | (1 << (31 - Index));\r |
84 | }\r | |
85 | }\r | |
86 | \r | |
87 | return NewValue;\r | |
88 | }\r | |
89 | \r | |
fb0b259e | 90 | /**\r |
f2abdc91 | 91 | Initialize CRC32 table.\r |
fb0b259e | 92 | **/\r |
93 | VOID\r | |
94 | RuntimeDriverInitializeCrc32Table (\r | |
95 | VOID\r | |
96 | )\r | |
f2abdc91 | 97 | {\r |
98 | UINTN TableEntry;\r | |
99 | UINTN Index;\r | |
100 | UINT32 Value;\r | |
101 | \r | |
102 | for (TableEntry = 0; TableEntry < 256; TableEntry++) {\r | |
103 | Value = ReverseBits ((UINT32) TableEntry);\r | |
104 | for (Index = 0; Index < 8; Index++) {\r | |
9fc78752 | 105 | if ((Value & 0x80000000) != 0) {\r |
f2abdc91 | 106 | Value = (Value << 1) ^ 0x04c11db7;\r |
107 | } else {\r | |
108 | Value = Value << 1;\r | |
109 | }\r | |
110 | }\r | |
111 | \r | |
112 | mCrcTable[TableEntry] = ReverseBits (Value);\r | |
113 | }\r | |
114 | }\r |