1 #include <stdio.h>
2 #include "../include/generated/autoconf.h"
3 #include "crc32defs.h"
4 #include <inttypes.h>
5
6 #define ENTRIES_PER_LINE 4
7
8 #if CRC_LE_BITS > 8
9 # define LE_TABLE_ROWS (CRC_LE_BITS/8)
10 # define LE_TABLE_SIZE 256
11 #else
12 # define LE_TABLE_ROWS 1
13 # define LE_TABLE_SIZE (1 << CRC_LE_BITS)
14 #endif
15
16 #if CRC_BE_BITS > 8
17 # define BE_TABLE_ROWS (CRC_BE_BITS/8)
18 # define BE_TABLE_SIZE 256
19 #else
20 # define BE_TABLE_ROWS 1
21 # define BE_TABLE_SIZE (1 << CRC_BE_BITS)
22 #endif
23
24 static uint32_t crc32table_le[LE_TABLE_ROWS][256];
25 static uint32_t crc32table_be[BE_TABLE_ROWS][256];
26 static uint32_t crc32ctable_le[LE_TABLE_ROWS][256];
27
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 */
crc32init_le_generic(const uint32_t polynomial,uint32_t (* tab)[256])35 static void crc32init_le_generic(const uint32_t polynomial,
36 uint32_t (*tab)[256])
37 {
38 unsigned i, j;
39 uint32_t crc = 1;
40
41 tab[0][0] = 0;
42
43 for (i = LE_TABLE_SIZE >> 1; i; i >>= 1) {
44 crc = (crc >> 1) ^ ((crc & 1) ? polynomial : 0);
45 for (j = 0; j < LE_TABLE_SIZE; j += 2 * i)
46 tab[0][i + j] = crc ^ tab[0][j];
47 }
48 for (i = 0; i < LE_TABLE_SIZE; i++) {
49 crc = tab[0][i];
50 for (j = 1; j < LE_TABLE_ROWS; j++) {
51 crc = tab[0][crc & 0xff] ^ (crc >> 8);
52 tab[j][i] = crc;
53 }
54 }
55 }
56
crc32init_le(void)57 static void crc32init_le(void)
58 {
59 crc32init_le_generic(CRCPOLY_LE, crc32table_le);
60 }
61
crc32cinit_le(void)62 static void crc32cinit_le(void)
63 {
64 crc32init_le_generic(CRC32C_POLY_LE, crc32ctable_le);
65 }
66
67 /**
68 * crc32init_be() - allocate and initialize BE table data
69 */
crc32init_be(void)70 static void crc32init_be(void)
71 {
72 unsigned i, j;
73 uint32_t crc = 0x80000000;
74
75 crc32table_be[0][0] = 0;
76
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++)
80 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];
84 for (j = 1; j < BE_TABLE_ROWS; j++) {
85 crc = crc32table_be[0][(crc >> 24) & 0xff] ^ (crc << 8);
86 crc32table_be[j][i] = crc;
87 }
88 }
89 }
90
output_table(uint32_t (* table)[256],int rows,int len,char * trans)91 static void output_table(uint32_t (*table)[256], int rows, int len, char *trans)
92 {
93 int i, j;
94
95 for (j = 0 ; j < rows; j++) {
96 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]);
103 }
104 }
105
main(int argc,char ** argv)106 int 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();
112 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");
117 printf("};\n");
118 }
119
120 if (CRC_BE_BITS > 1) {
121 crc32init_be();
122 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");
127 printf("};\n");
128 }
129 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 }
138
139 return 0;
140 }
141