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1// SPDX-License-Identifier: GPL-2.0
2#include <stdio.h>
3#include "../include/linux/crc32poly.h"
4#include "../include/generated/autoconf.h"
5#include "crc32defs.h"
6#include <inttypes.h>
7
8#define ENTRIES_PER_LINE 4
9
10#if CRC_LE_BITS > 8
11# define LE_TABLE_ROWS (CRC_LE_BITS/8)
12# define LE_TABLE_SIZE 256
13#else
14# define LE_TABLE_ROWS 1
15# define LE_TABLE_SIZE (1 << CRC_LE_BITS)
16#endif
17
18#if CRC_BE_BITS > 8
19# define BE_TABLE_ROWS (CRC_BE_BITS/8)
20# define BE_TABLE_SIZE 256
21#else
22# define BE_TABLE_ROWS 1
23# define BE_TABLE_SIZE (1 << CRC_BE_BITS)
24#endif
25
26static uint32_t crc32table_le[LE_TABLE_ROWS][256];
27static uint32_t crc32table_be[BE_TABLE_ROWS][256];
28static uint32_t crc32ctable_le[LE_TABLE_ROWS][256];
29
30/**
31 * crc32init_le() - allocate and initialize LE table data
32 *
33 * crc is the crc of the byte i; other entries are filled in based on the
34 * fact that crctable[i^j] = crctable[i] ^ crctable[j].
35 *
36 */
37static void crc32init_le_generic(const uint32_t polynomial,
38 uint32_t (*tab)[256])
39{
40 unsigned i, j;
41 uint32_t crc = 1;
42
43 tab[0][0] = 0;
44
45 for (i = LE_TABLE_SIZE >> 1; i; i >>= 1) {
46 crc = (crc >> 1) ^ ((crc & 1) ? polynomial : 0);
47 for (j = 0; j < LE_TABLE_SIZE; j += 2 * i)
48 tab[0][i + j] = crc ^ tab[0][j];
49 }
50 for (i = 0; i < LE_TABLE_SIZE; i++) {
51 crc = tab[0][i];
52 for (j = 1; j < LE_TABLE_ROWS; j++) {
53 crc = tab[0][crc & 0xff] ^ (crc >> 8);
54 tab[j][i] = crc;
55 }
56 }
57}
58
59static void crc32init_le(void)
60{
61 crc32init_le_generic(CRC32_POLY_LE, crc32table_le);
62}
63
64static void crc32cinit_le(void)
65{
66 crc32init_le_generic(CRC32C_POLY_LE, crc32ctable_le);
67}
68
69/**
70 * crc32init_be() - allocate and initialize BE table data
71 */
72static void crc32init_be(void)
73{
74 unsigned i, j;
75 uint32_t crc = 0x80000000;
76
77 crc32table_be[0][0] = 0;
78
79 for (i = 1; i < BE_TABLE_SIZE; i <<= 1) {
80 crc = (crc << 1) ^ ((crc & 0x80000000) ? CRC32_POLY_BE : 0);
81 for (j = 0; j < i; j++)
82 crc32table_be[0][i + j] = crc ^ crc32table_be[0][j];
83 }
84 for (i = 0; i < BE_TABLE_SIZE; i++) {
85 crc = crc32table_be[0][i];
86 for (j = 1; j < BE_TABLE_ROWS; j++) {
87 crc = crc32table_be[0][(crc >> 24) & 0xff] ^ (crc << 8);
88 crc32table_be[j][i] = crc;
89 }
90 }
91}
92
93static void output_table(uint32_t (*table)[256], int rows, int len, char *trans)
94{
95 int i, j;
96
97 for (j = 0 ; j < rows; j++) {
98 printf("{");
99 for (i = 0; i < len - 1; i++) {
100 if (i % ENTRIES_PER_LINE == 0)
101 printf("\n");
102 printf("%s(0x%8.8xL), ", trans, table[j][i]);
103 }
104 printf("%s(0x%8.8xL)},\n", trans, table[j][len - 1]);
105 }
106}
107
108int main(int argc, char** argv)
109{
110 printf("/* this file is generated - do not edit */\n\n");
111
112 if (CRC_LE_BITS > 1) {
113 crc32init_le();
114 printf("static const u32 ____cacheline_aligned "
115 "crc32table_le[%d][%d] = {",
116 LE_TABLE_ROWS, LE_TABLE_SIZE);
117 output_table(crc32table_le, LE_TABLE_ROWS,
118 LE_TABLE_SIZE, "tole");
119 printf("};\n");
120 }
121
122 if (CRC_BE_BITS > 1) {
123 crc32init_be();
124 printf("static const u32 ____cacheline_aligned "
125 "crc32table_be[%d][%d] = {",
126 BE_TABLE_ROWS, BE_TABLE_SIZE);
127 output_table(crc32table_be, LE_TABLE_ROWS,
128 BE_TABLE_SIZE, "tobe");
129 printf("};\n");
130 }
131 if (CRC_LE_BITS > 1) {
132 crc32cinit_le();
133 printf("static const u32 ____cacheline_aligned "
134 "crc32ctable_le[%d][%d] = {",
135 LE_TABLE_ROWS, LE_TABLE_SIZE);
136 output_table(crc32ctable_le, LE_TABLE_ROWS,
137 LE_TABLE_SIZE, "tole");
138 printf("};\n");
139 }
140
141 return 0;
142}
1#include <stdio.h>
2#include "crc32defs.h"
3#include <inttypes.h>
4
5#define ENTRIES_PER_LINE 4
6
7#define LE_TABLE_SIZE (1 << CRC_LE_BITS)
8#define BE_TABLE_SIZE (1 << CRC_BE_BITS)
9
10static uint32_t crc32table_le[4][LE_TABLE_SIZE];
11static uint32_t crc32table_be[4][BE_TABLE_SIZE];
12
13/**
14 * crc32init_le() - allocate and initialize LE table data
15 *
16 * crc is the crc of the byte i; other entries are filled in based on the
17 * fact that crctable[i^j] = crctable[i] ^ crctable[j].
18 *
19 */
20static void crc32init_le(void)
21{
22 unsigned i, j;
23 uint32_t crc = 1;
24
25 crc32table_le[0][0] = 0;
26
27 for (i = 1 << (CRC_LE_BITS - 1); i; i >>= 1) {
28 crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0);
29 for (j = 0; j < LE_TABLE_SIZE; j += 2 * i)
30 crc32table_le[0][i + j] = crc ^ crc32table_le[0][j];
31 }
32 for (i = 0; i < LE_TABLE_SIZE; i++) {
33 crc = crc32table_le[0][i];
34 for (j = 1; j < 4; j++) {
35 crc = crc32table_le[0][crc & 0xff] ^ (crc >> 8);
36 crc32table_le[j][i] = crc;
37 }
38 }
39}
40
41/**
42 * crc32init_be() - allocate and initialize BE table data
43 */
44static void crc32init_be(void)
45{
46 unsigned i, j;
47 uint32_t crc = 0x80000000;
48
49 crc32table_be[0][0] = 0;
50
51 for (i = 1; i < BE_TABLE_SIZE; i <<= 1) {
52 crc = (crc << 1) ^ ((crc & 0x80000000) ? CRCPOLY_BE : 0);
53 for (j = 0; j < i; j++)
54 crc32table_be[0][i + j] = crc ^ crc32table_be[0][j];
55 }
56 for (i = 0; i < BE_TABLE_SIZE; i++) {
57 crc = crc32table_be[0][i];
58 for (j = 1; j < 4; j++) {
59 crc = crc32table_be[0][(crc >> 24) & 0xff] ^ (crc << 8);
60 crc32table_be[j][i] = crc;
61 }
62 }
63}
64
65static void output_table(uint32_t table[4][256], int len, char *trans)
66{
67 int i, j;
68
69 for (j = 0 ; j < 4; j++) {
70 printf("{");
71 for (i = 0; i < len - 1; i++) {
72 if (i % ENTRIES_PER_LINE == 0)
73 printf("\n");
74 printf("%s(0x%8.8xL), ", trans, table[j][i]);
75 }
76 printf("%s(0x%8.8xL)},\n", trans, table[j][len - 1]);
77 }
78}
79
80int main(int argc, char** argv)
81{
82 printf("/* this file is generated - do not edit */\n\n");
83
84 if (CRC_LE_BITS > 1) {
85 crc32init_le();
86 printf("static const u32 crc32table_le[4][256] = {");
87 output_table(crc32table_le, LE_TABLE_SIZE, "tole");
88 printf("};\n");
89 }
90
91 if (CRC_BE_BITS > 1) {
92 crc32init_be();
93 printf("static const u32 crc32table_be[4][256] = {");
94 output_table(crc32table_be, BE_TABLE_SIZE, "tobe");
95 printf("};\n");
96 }
97
98 return 0;
99}