]>
Commit | Line | Data |
---|---|---|
1 | /* SPDX-License-Identifier: GPL-2.0 */ | |
2 | ||
3 | /* Try to choose an implementation variant via Kconfig */ | |
4 | #ifdef CONFIG_CRC32_SLICEBY8 | |
5 | # define CRC_LE_BITS 64 | |
6 | # define CRC_BE_BITS 64 | |
7 | #endif | |
8 | #ifdef CONFIG_CRC32_SLICEBY4 | |
9 | # define CRC_LE_BITS 32 | |
10 | # define CRC_BE_BITS 32 | |
11 | #endif | |
12 | #ifdef CONFIG_CRC32_SARWATE | |
13 | # define CRC_LE_BITS 8 | |
14 | # define CRC_BE_BITS 8 | |
15 | #endif | |
16 | #ifdef CONFIG_CRC32_BIT | |
17 | # define CRC_LE_BITS 1 | |
18 | # define CRC_BE_BITS 1 | |
19 | #endif | |
20 | ||
21 | /* | |
22 | * How many bits at a time to use. Valid values are 1, 2, 4, 8, 32 and 64. | |
23 | * For less performance-sensitive, use 4 or 8 to save table size. | |
24 | * For larger systems choose same as CPU architecture as default. | |
25 | * This works well on X86_64, SPARC64 systems. This may require some | |
26 | * elaboration after experiments with other architectures. | |
27 | */ | |
28 | #ifndef CRC_LE_BITS | |
29 | # ifdef CONFIG_64BIT | |
30 | # define CRC_LE_BITS 64 | |
31 | # else | |
32 | # define CRC_LE_BITS 32 | |
33 | # endif | |
34 | #endif | |
35 | #ifndef CRC_BE_BITS | |
36 | # ifdef CONFIG_64BIT | |
37 | # define CRC_BE_BITS 64 | |
38 | # else | |
39 | # define CRC_BE_BITS 32 | |
40 | # endif | |
41 | #endif | |
42 | ||
43 | /* | |
44 | * Little-endian CRC computation. Used with serial bit streams sent | |
45 | * lsbit-first. Be sure to use cpu_to_le32() to append the computed CRC. | |
46 | */ | |
47 | #if CRC_LE_BITS > 64 || CRC_LE_BITS < 1 || CRC_LE_BITS == 16 || \ | |
48 | CRC_LE_BITS & CRC_LE_BITS-1 | |
49 | # error "CRC_LE_BITS must be one of {1, 2, 4, 8, 32, 64}" | |
50 | #endif | |
51 | ||
52 | /* | |
53 | * Big-endian CRC computation. Used with serial bit streams sent | |
54 | * msbit-first. Be sure to use cpu_to_be32() to append the computed CRC. | |
55 | */ | |
56 | #if CRC_BE_BITS > 64 || CRC_BE_BITS < 1 || CRC_BE_BITS == 16 || \ | |
57 | CRC_BE_BITS & CRC_BE_BITS-1 | |
58 | # error "CRC_BE_BITS must be one of {1, 2, 4, 8, 32, 64}" | |
59 | #endif |