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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 | ||
26 | static uint32_t crc32table_le[LE_TABLE_ROWS][256]; | |
27 | static uint32_t crc32table_be[BE_TABLE_ROWS][256]; | |
28 | static 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 | */ | |
37 | static 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 | ||
59 | static void crc32init_le(void) | |
60 | { | |
61 | crc32init_le_generic(CRC32_POLY_LE, crc32table_le); | |
62 | } | |
63 | ||
64 | static 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 | */ | |
72 | static 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 | ||
93 | static 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 | ||
108 | int 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 | } |