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Source at commit 2604e7f9a98c27be50a0c3ff7503b6a5ea8f6cfe created 12 years 7 months ago. By Maarten ter Huurne, cpufreq_stats: Support runtime changes to frequency table | |
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1 | /* |
2 | * There are multiple 16-bit CRC polynomials in common use, but this is |
3 | * *the* standard CRC-32 polynomial, first popularized by Ethernet. |
4 | * x^32+x^26+x^23+x^22+x^16+x^12+x^11+x^10+x^8+x^7+x^5+x^4+x^2+x^1+x^0 |
5 | */ |
6 | #define CRCPOLY_LE 0xedb88320 |
7 | #define CRCPOLY_BE 0x04c11db7 |
8 | |
9 | /* |
10 | * This is the CRC32c polynomial, as outlined by Castagnoli. |
11 | * x^32+x^28+x^27+x^26+x^25+x^23+x^22+x^20+x^19+x^18+x^14+x^13+x^11+x^10+x^9+ |
12 | * x^8+x^6+x^0 |
13 | */ |
14 | #define CRC32C_POLY_LE 0x82F63B78 |
15 | |
16 | /* Try to choose an implementation variant via Kconfig */ |
17 | #ifdef CONFIG_CRC32_SLICEBY8 |
18 | # define CRC_LE_BITS 64 |
19 | # define CRC_BE_BITS 64 |
20 | #endif |
21 | #ifdef CONFIG_CRC32_SLICEBY4 |
22 | # define CRC_LE_BITS 32 |
23 | # define CRC_BE_BITS 32 |
24 | #endif |
25 | #ifdef CONFIG_CRC32_SARWATE |
26 | # define CRC_LE_BITS 8 |
27 | # define CRC_BE_BITS 8 |
28 | #endif |
29 | #ifdef CONFIG_CRC32_BIT |
30 | # define CRC_LE_BITS 1 |
31 | # define CRC_BE_BITS 1 |
32 | #endif |
33 | |
34 | /* |
35 | * How many bits at a time to use. Valid values are 1, 2, 4, 8, 32 and 64. |
36 | * For less performance-sensitive, use 4 or 8 to save table size. |
37 | * For larger systems choose same as CPU architecture as default. |
38 | * This works well on X86_64, SPARC64 systems. This may require some |
39 | * elaboration after experiments with other architectures. |
40 | */ |
41 | #ifndef CRC_LE_BITS |
42 | # ifdef CONFIG_64BIT |
43 | # define CRC_LE_BITS 64 |
44 | # else |
45 | # define CRC_LE_BITS 32 |
46 | # endif |
47 | #endif |
48 | #ifndef CRC_BE_BITS |
49 | # ifdef CONFIG_64BIT |
50 | # define CRC_BE_BITS 64 |
51 | # else |
52 | # define CRC_BE_BITS 32 |
53 | # endif |
54 | #endif |
55 | |
56 | /* |
57 | * Little-endian CRC computation. Used with serial bit streams sent |
58 | * lsbit-first. Be sure to use cpu_to_le32() to append the computed CRC. |
59 | */ |
60 | #if CRC_LE_BITS > 64 || CRC_LE_BITS < 1 || CRC_LE_BITS == 16 || \ |
61 | CRC_LE_BITS & CRC_LE_BITS-1 |
62 | # error "CRC_LE_BITS must be one of {1, 2, 4, 8, 32, 64}" |
63 | #endif |
64 | |
65 | /* |
66 | * Big-endian CRC computation. Used with serial bit streams sent |
67 | * msbit-first. Be sure to use cpu_to_be32() to append the computed CRC. |
68 | */ |
69 | #if CRC_BE_BITS > 64 || CRC_BE_BITS < 1 || CRC_BE_BITS == 16 || \ |
70 | CRC_BE_BITS & CRC_BE_BITS-1 |
71 | # error "CRC_BE_BITS must be one of {1, 2, 4, 8, 32, 64}" |
72 | #endif |
73 |
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