1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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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 |
60 |