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