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

 1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 * There are multiple 16-bit CRC polynomials in common use, but this is
 4 * *the* standard CRC-32 polynomial, first popularized by Ethernet.
 5 * 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
 6 */
 7#define CRCPOLY_LE 0xedb88320
 8#define CRCPOLY_BE 0x04c11db7
 9
10/*
11 * This is the CRC32c polynomial, as outlined by Castagnoli.
12 * 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+
13 * x^8+x^6+x^0
14 */
15#define CRC32C_POLY_LE 0x82F63B78
16
17/* Try to choose an implementation variant via Kconfig */
18#ifdef CONFIG_CRC32_SLICEBY8
19# define CRC_LE_BITS 64
20# define CRC_BE_BITS 64
21#endif
22#ifdef CONFIG_CRC32_SLICEBY4
23# define CRC_LE_BITS 32
24# define CRC_BE_BITS 32
25#endif
26#ifdef CONFIG_CRC32_SARWATE
27# define CRC_LE_BITS 8
28# define CRC_BE_BITS 8
29#endif
30#ifdef CONFIG_CRC32_BIT
31# define CRC_LE_BITS 1
32# define CRC_BE_BITS 1
33#endif
34
35/*
36 * How many bits at a time to use.  Valid values are 1, 2, 4, 8, 32 and 64.
37 * For less performance-sensitive, use 4 or 8 to save table size.
38 * For larger systems choose same as CPU architecture as default.
39 * This works well on X86_64, SPARC64 systems. This may require some
40 * elaboration after experiments with other architectures.
41 */
42#ifndef CRC_LE_BITS
43#  ifdef CONFIG_64BIT
44#  define CRC_LE_BITS 64
45#  else
46#  define CRC_LE_BITS 32
47#  endif
48#endif
49#ifndef CRC_BE_BITS
50#  ifdef CONFIG_64BIT
51#  define CRC_BE_BITS 64
52#  else
53#  define CRC_BE_BITS 32
54#  endif
55#endif
56
57/*
58 * Little-endian CRC computation.  Used with serial bit streams sent
59 * lsbit-first.  Be sure to use cpu_to_le32() to append the computed CRC.
60 */
61#if CRC_LE_BITS > 64 || CRC_LE_BITS < 1 || CRC_LE_BITS == 16 || \
62	CRC_LE_BITS & CRC_LE_BITS-1
63# error "CRC_LE_BITS must be one of {1, 2, 4, 8, 32, 64}"
64#endif
65
66/*
67 * Big-endian CRC computation.  Used with serial bit streams sent
68 * msbit-first.  Be sure to use cpu_to_be32() to append the computed CRC.
69 */
70#if CRC_BE_BITS > 64 || CRC_BE_BITS < 1 || CRC_BE_BITS == 16 || \
71	CRC_BE_BITS & CRC_BE_BITS-1
72# error "CRC_BE_BITS must be one of {1, 2, 4, 8, 32, 64}"
73#endif