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 */ 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 57 static void crc32init_le(void) 58 { 59 crc32init_le_generic(CRCPOLY_LE, crc32table_le); 60 } 61 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 */ 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 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 } 105 106 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