Commit | Line | Data |
---|---|---|
1da177e4 | 1 | #include <stdio.h> |
324eb0f1 | 2 | #include "../include/generated/autoconf.h" |
1da177e4 LT |
3 | #include "crc32defs.h" |
4 | #include <inttypes.h> | |
5 | ||
6 | #define ENTRIES_PER_LINE 4 | |
7 | ||
324eb0f1 BP |
8 | #if CRC_LE_BITS > 8 |
9 | # define LE_TABLE_ROWS (CRC_LE_BITS/8) | |
10 | # define LE_TABLE_SIZE 256 | |
9a1dbf6a | 11 | #else |
324eb0f1 BP |
12 | # define LE_TABLE_ROWS 1 |
13 | # define LE_TABLE_SIZE (1 << CRC_LE_BITS) | |
9a1dbf6a BP |
14 | #endif |
15 | ||
324eb0f1 BP |
16 | #if CRC_BE_BITS > 8 |
17 | # define BE_TABLE_ROWS (CRC_BE_BITS/8) | |
18 | # define BE_TABLE_SIZE 256 | |
9a1dbf6a | 19 | #else |
324eb0f1 BP |
20 | # define BE_TABLE_ROWS 1 |
21 | # define BE_TABLE_SIZE (1 << CRC_BE_BITS) | |
9a1dbf6a | 22 | #endif |
1da177e4 | 23 | |
324eb0f1 BP |
24 | static uint32_t crc32table_le[LE_TABLE_ROWS][256]; |
25 | static uint32_t crc32table_be[BE_TABLE_ROWS][256]; | |
1da177e4 LT |
26 | |
27 | /** | |
28 | * crc32init_le() - allocate and initialize LE table data | |
29 | * | |
30 | * crc is the crc of the byte i; other entries are filled in based on the | |
31 | * fact that crctable[i^j] = crctable[i] ^ crctable[j]. | |
32 | * | |
33 | */ | |
34 | static void crc32init_le(void) | |
35 | { | |
36 | unsigned i, j; | |
37 | uint32_t crc = 1; | |
38 | ||
836e2af9 | 39 | crc32table_le[0][0] = 0; |
1da177e4 | 40 | |
9a1dbf6a | 41 | for (i = LE_TABLE_SIZE >> 1; i; i >>= 1) { |
1da177e4 LT |
42 | crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0); |
43 | for (j = 0; j < LE_TABLE_SIZE; j += 2 * i) | |
836e2af9 JT |
44 | crc32table_le[0][i + j] = crc ^ crc32table_le[0][j]; |
45 | } | |
46 | for (i = 0; i < LE_TABLE_SIZE; i++) { | |
47 | crc = crc32table_le[0][i]; | |
324eb0f1 | 48 | for (j = 1; j < LE_TABLE_ROWS; j++) { |
836e2af9 JT |
49 | crc = crc32table_le[0][crc & 0xff] ^ (crc >> 8); |
50 | crc32table_le[j][i] = crc; | |
51 | } | |
1da177e4 LT |
52 | } |
53 | } | |
54 | ||
55 | /** | |
56 | * crc32init_be() - allocate and initialize BE table data | |
57 | */ | |
58 | static void crc32init_be(void) | |
59 | { | |
60 | unsigned i, j; | |
61 | uint32_t crc = 0x80000000; | |
62 | ||
836e2af9 | 63 | crc32table_be[0][0] = 0; |
1da177e4 LT |
64 | |
65 | for (i = 1; i < BE_TABLE_SIZE; i <<= 1) { | |
66 | crc = (crc << 1) ^ ((crc & 0x80000000) ? CRCPOLY_BE : 0); | |
67 | for (j = 0; j < i; j++) | |
836e2af9 JT |
68 | crc32table_be[0][i + j] = crc ^ crc32table_be[0][j]; |
69 | } | |
70 | for (i = 0; i < BE_TABLE_SIZE; i++) { | |
71 | crc = crc32table_be[0][i]; | |
324eb0f1 | 72 | for (j = 1; j < BE_TABLE_ROWS; j++) { |
836e2af9 JT |
73 | crc = crc32table_be[0][(crc >> 24) & 0xff] ^ (crc << 8); |
74 | crc32table_be[j][i] = crc; | |
75 | } | |
1da177e4 LT |
76 | } |
77 | } | |
78 | ||
324eb0f1 | 79 | static void output_table(uint32_t (*table)[256], int rows, int len, char *trans) |
1da177e4 | 80 | { |
836e2af9 | 81 | int i, j; |
1da177e4 | 82 | |
324eb0f1 | 83 | for (j = 0 ; j < rows; j++) { |
836e2af9 JT |
84 | printf("{"); |
85 | for (i = 0; i < len - 1; i++) { | |
86 | if (i % ENTRIES_PER_LINE == 0) | |
87 | printf("\n"); | |
88 | printf("%s(0x%8.8xL), ", trans, table[j][i]); | |
89 | } | |
90 | printf("%s(0x%8.8xL)},\n", trans, table[j][len - 1]); | |
1da177e4 | 91 | } |
1da177e4 LT |
92 | } |
93 | ||
94 | int main(int argc, char** argv) | |
95 | { | |
96 | printf("/* this file is generated - do not edit */\n\n"); | |
97 | ||
98 | if (CRC_LE_BITS > 1) { | |
99 | crc32init_le(); | |
324eb0f1 BP |
100 | printf("static const u32 __cacheline_aligned " |
101 | "crc32table_le[%d][%d] = {", | |
102 | LE_TABLE_ROWS, LE_TABLE_SIZE); | |
103 | output_table(crc32table_le, LE_TABLE_ROWS, | |
104 | LE_TABLE_SIZE, "tole"); | |
1da177e4 LT |
105 | printf("};\n"); |
106 | } | |
107 | ||
108 | if (CRC_BE_BITS > 1) { | |
109 | crc32init_be(); | |
324eb0f1 BP |
110 | printf("static const u32 __cacheline_aligned " |
111 | "crc32table_be[%d][%d] = {", | |
112 | BE_TABLE_ROWS, BE_TABLE_SIZE); | |
113 | output_table(crc32table_be, LE_TABLE_ROWS, | |
114 | BE_TABLE_SIZE, "tobe"); | |
1da177e4 LT |
115 | printf("};\n"); |
116 | } | |
117 | ||
118 | return 0; | |
119 | } |