| #include <stdio.h> |
| #include "../include/generated/autoconf.h" |
| #include "crc32defs.h" |
| #include <inttypes.h> |
| |
| #define ENTRIES_PER_LINE 4 |
| |
| #if CRC_LE_BITS > 8 |
| # define LE_TABLE_ROWS (CRC_LE_BITS/8) |
| # define LE_TABLE_SIZE 256 |
| #else |
| # define LE_TABLE_ROWS 1 |
| # define LE_TABLE_SIZE (1 << CRC_LE_BITS) |
| #endif |
| |
| #if CRC_BE_BITS > 8 |
| # define BE_TABLE_ROWS (CRC_BE_BITS/8) |
| # define BE_TABLE_SIZE 256 |
| #else |
| # define BE_TABLE_ROWS 1 |
| # define BE_TABLE_SIZE (1 << CRC_BE_BITS) |
| #endif |
| |
| static uint32_t crc32table_le[LE_TABLE_ROWS][256]; |
| static uint32_t crc32table_be[BE_TABLE_ROWS][256]; |
| |
| /** |
| * crc32init_le() - allocate and initialize LE table data |
| * |
| * crc is the crc of the byte i; other entries are filled in based on the |
| * fact that crctable[i^j] = crctable[i] ^ crctable[j]. |
| * |
| */ |
| static void crc32init_le(void) |
| { |
| unsigned i, j; |
| uint32_t crc = 1; |
| |
| crc32table_le[0][0] = 0; |
| |
| for (i = LE_TABLE_SIZE >> 1; i; i >>= 1) { |
| crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0); |
| for (j = 0; j < LE_TABLE_SIZE; j += 2 * i) |
| crc32table_le[0][i + j] = crc ^ crc32table_le[0][j]; |
| } |
| for (i = 0; i < LE_TABLE_SIZE; i++) { |
| crc = crc32table_le[0][i]; |
| for (j = 1; j < LE_TABLE_ROWS; j++) { |
| crc = crc32table_le[0][crc & 0xff] ^ (crc >> 8); |
| crc32table_le[j][i] = crc; |
| } |
| } |
| } |
| |
| /** |
| * crc32init_be() - allocate and initialize BE table data |
| */ |
| static void crc32init_be(void) |
| { |
| unsigned i, j; |
| uint32_t crc = 0x80000000; |
| |
| crc32table_be[0][0] = 0; |
| |
| for (i = 1; i < BE_TABLE_SIZE; i <<= 1) { |
| crc = (crc << 1) ^ ((crc & 0x80000000) ? CRCPOLY_BE : 0); |
| for (j = 0; j < i; j++) |
| crc32table_be[0][i + j] = crc ^ crc32table_be[0][j]; |
| } |
| for (i = 0; i < BE_TABLE_SIZE; i++) { |
| crc = crc32table_be[0][i]; |
| for (j = 1; j < BE_TABLE_ROWS; j++) { |
| crc = crc32table_be[0][(crc >> 24) & 0xff] ^ (crc << 8); |
| crc32table_be[j][i] = crc; |
| } |
| } |
| } |
| |
| static void output_table(uint32_t (*table)[256], int rows, int len, char *trans) |
| { |
| int i, j; |
| |
| for (j = 0 ; j < rows; j++) { |
| printf("{"); |
| for (i = 0; i < len - 1; i++) { |
| if (i % ENTRIES_PER_LINE == 0) |
| printf("\n"); |
| printf("%s(0x%8.8xL), ", trans, table[j][i]); |
| } |
| printf("%s(0x%8.8xL)},\n", trans, table[j][len - 1]); |
| } |
| } |
| |
| int main(int argc, char** argv) |
| { |
| printf("/* this file is generated - do not edit */\n\n"); |
| |
| if (CRC_LE_BITS > 1) { |
| crc32init_le(); |
| printf("static const u32 __cacheline_aligned " |
| "crc32table_le[%d][%d] = {", |
| LE_TABLE_ROWS, LE_TABLE_SIZE); |
| output_table(crc32table_le, LE_TABLE_ROWS, |
| LE_TABLE_SIZE, "tole"); |
| printf("};\n"); |
| } |
| |
| if (CRC_BE_BITS > 1) { |
| crc32init_be(); |
| printf("static const u32 __cacheline_aligned " |
| "crc32table_be[%d][%d] = {", |
| BE_TABLE_ROWS, BE_TABLE_SIZE); |
| output_table(crc32table_be, LE_TABLE_ROWS, |
| BE_TABLE_SIZE, "tobe"); |
| printf("};\n"); |
| } |
| |
| return 0; |
| } |