blob: 8f8d5439e2d9c59d373f01e9bb507f3f41433ef0 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#include <stdio.h>
Bob Pearson324eb0f2012-03-23 15:02:24 -07002#include "../include/generated/autoconf.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -07003#include "crc32defs.h"
4#include <inttypes.h>
5
6#define ENTRIES_PER_LINE 4
7
Bob Pearson324eb0f2012-03-23 15:02:24 -07008#if CRC_LE_BITS > 8
9# define LE_TABLE_ROWS (CRC_LE_BITS/8)
10# define LE_TABLE_SIZE 256
Bob Pearson9a1dbf62012-03-23 15:02:23 -070011#else
Bob Pearson324eb0f2012-03-23 15:02:24 -070012# define LE_TABLE_ROWS 1
13# define LE_TABLE_SIZE (1 << CRC_LE_BITS)
Bob Pearson9a1dbf62012-03-23 15:02:23 -070014#endif
15
Bob Pearson324eb0f2012-03-23 15:02:24 -070016#if CRC_BE_BITS > 8
17# define BE_TABLE_ROWS (CRC_BE_BITS/8)
18# define BE_TABLE_SIZE 256
Bob Pearson9a1dbf62012-03-23 15:02:23 -070019#else
Bob Pearson324eb0f2012-03-23 15:02:24 -070020# define BE_TABLE_ROWS 1
21# define BE_TABLE_SIZE (1 << CRC_BE_BITS)
Bob Pearson9a1dbf62012-03-23 15:02:23 -070022#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
Bob Pearson324eb0f2012-03-23 15:02:24 -070024static uint32_t crc32table_le[LE_TABLE_ROWS][256];
25static uint32_t crc32table_be[BE_TABLE_ROWS][256];
Darrick J. Wong46c58012012-03-23 15:02:25 -070026static uint32_t crc32ctable_le[LE_TABLE_ROWS][256];
Linus Torvalds1da177e2005-04-16 15:20:36 -070027
28/**
29 * crc32init_le() - allocate and initialize LE table data
30 *
31 * crc is the crc of the byte i; other entries are filled in based on the
32 * fact that crctable[i^j] = crctable[i] ^ crctable[j].
33 *
34 */
Darrick J. Wong46c58012012-03-23 15:02:25 -070035static void crc32init_le_generic(const uint32_t polynomial,
36 uint32_t (*tab)[256])
Linus Torvalds1da177e2005-04-16 15:20:36 -070037{
38 unsigned i, j;
39 uint32_t crc = 1;
40
Darrick J. Wong46c58012012-03-23 15:02:25 -070041 tab[0][0] = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
Bob Pearson9a1dbf62012-03-23 15:02:23 -070043 for (i = LE_TABLE_SIZE >> 1; i; i >>= 1) {
Darrick J. Wong46c58012012-03-23 15:02:25 -070044 crc = (crc >> 1) ^ ((crc & 1) ? polynomial : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -070045 for (j = 0; j < LE_TABLE_SIZE; j += 2 * i)
Darrick J. Wong46c58012012-03-23 15:02:25 -070046 tab[0][i + j] = crc ^ tab[0][j];
Joakim Tjernlund836e2af2010-05-24 14:33:31 -070047 }
48 for (i = 0; i < LE_TABLE_SIZE; i++) {
Darrick J. Wong46c58012012-03-23 15:02:25 -070049 crc = tab[0][i];
Bob Pearson324eb0f2012-03-23 15:02:24 -070050 for (j = 1; j < LE_TABLE_ROWS; j++) {
Darrick J. Wong46c58012012-03-23 15:02:25 -070051 crc = tab[0][crc & 0xff] ^ (crc >> 8);
52 tab[j][i] = crc;
Joakim Tjernlund836e2af2010-05-24 14:33:31 -070053 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 }
55}
56
Darrick J. Wong46c58012012-03-23 15:02:25 -070057static void crc32init_le(void)
58{
59 crc32init_le_generic(CRCPOLY_LE, crc32table_le);
60}
61
62static void crc32cinit_le(void)
63{
64 crc32init_le_generic(CRC32C_POLY_LE, crc32ctable_le);
65}
66
Linus Torvalds1da177e2005-04-16 15:20:36 -070067/**
68 * crc32init_be() - allocate and initialize BE table data
69 */
70static void crc32init_be(void)
71{
72 unsigned i, j;
73 uint32_t crc = 0x80000000;
74
Joakim Tjernlund836e2af2010-05-24 14:33:31 -070075 crc32table_be[0][0] = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
77 for (i = 1; i < BE_TABLE_SIZE; i <<= 1) {
78 crc = (crc << 1) ^ ((crc & 0x80000000) ? CRCPOLY_BE : 0);
79 for (j = 0; j < i; j++)
Joakim Tjernlund836e2af2010-05-24 14:33:31 -070080 crc32table_be[0][i + j] = crc ^ crc32table_be[0][j];
81 }
82 for (i = 0; i < BE_TABLE_SIZE; i++) {
83 crc = crc32table_be[0][i];
Bob Pearson324eb0f2012-03-23 15:02:24 -070084 for (j = 1; j < BE_TABLE_ROWS; j++) {
Joakim Tjernlund836e2af2010-05-24 14:33:31 -070085 crc = crc32table_be[0][(crc >> 24) & 0xff] ^ (crc << 8);
86 crc32table_be[j][i] = crc;
87 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 }
89}
90
Bob Pearson324eb0f2012-03-23 15:02:24 -070091static void output_table(uint32_t (*table)[256], int rows, int len, char *trans)
Linus Torvalds1da177e2005-04-16 15:20:36 -070092{
Joakim Tjernlund836e2af2010-05-24 14:33:31 -070093 int i, j;
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
Bob Pearson324eb0f2012-03-23 15:02:24 -070095 for (j = 0 ; j < rows; j++) {
Joakim Tjernlund836e2af2010-05-24 14:33:31 -070096 printf("{");
97 for (i = 0; i < len - 1; i++) {
98 if (i % ENTRIES_PER_LINE == 0)
99 printf("\n");
100 printf("%s(0x%8.8xL), ", trans, table[j][i]);
101 }
102 printf("%s(0x%8.8xL)},\n", trans, table[j][len - 1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104}
105
106int main(int argc, char** argv)
107{
108 printf("/* this file is generated - do not edit */\n\n");
109
110 if (CRC_LE_BITS > 1) {
111 crc32init_le();
Bob Pearson324eb0f2012-03-23 15:02:24 -0700112 printf("static const u32 __cacheline_aligned "
113 "crc32table_le[%d][%d] = {",
114 LE_TABLE_ROWS, LE_TABLE_SIZE);
115 output_table(crc32table_le, LE_TABLE_ROWS,
116 LE_TABLE_SIZE, "tole");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 printf("};\n");
118 }
119
120 if (CRC_BE_BITS > 1) {
121 crc32init_be();
Bob Pearson324eb0f2012-03-23 15:02:24 -0700122 printf("static const u32 __cacheline_aligned "
123 "crc32table_be[%d][%d] = {",
124 BE_TABLE_ROWS, BE_TABLE_SIZE);
125 output_table(crc32table_be, LE_TABLE_ROWS,
126 BE_TABLE_SIZE, "tobe");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 printf("};\n");
128 }
Darrick J. Wong46c58012012-03-23 15:02:25 -0700129 if (CRC_LE_BITS > 1) {
130 crc32cinit_le();
131 printf("static const u32 __cacheline_aligned "
132 "crc32ctable_le[%d][%d] = {",
133 LE_TABLE_ROWS, LE_TABLE_SIZE);
134 output_table(crc32ctable_le, LE_TABLE_ROWS,
135 LE_TABLE_SIZE, "tole");
136 printf("};\n");
137 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
139 return 0;
140}