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/* 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