1 /*- 2 * BSD LICENSE 3 * 4 * Copyright (c) Intel Corporation. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * * Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * * Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * * Neither the name of Intel Corporation nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include "util_internal.h" 35 #include "spdk/crc32.h" 36 37 void 38 crc32_table_init(struct spdk_crc32_table *table, uint32_t polynomial_reflect) 39 { 40 int i, j; 41 uint32_t val; 42 43 for (i = 0; i < 256; i++) { 44 val = i; 45 for (j = 0; j < 8; j++) { 46 if (val & 1) { 47 val = (val >> 1) ^ polynomial_reflect; 48 } else { 49 val = (val >> 1); 50 } 51 } 52 table->table[i] = val; 53 } 54 } 55 56 #ifdef SPDK_HAVE_ARM_CRC 57 58 uint32_t 59 crc32_update(const struct spdk_crc32_table *table, const void *buf, size_t len, uint32_t crc) 60 { 61 size_t count; 62 const uint64_t *dword_buf; 63 64 count = len & 7; 65 while (count--) { 66 crc = __crc32b(crc, *(const uint8_t *)buf); 67 buf++; 68 } 69 dword_buf = (const uint64_t *)buf; 70 71 count = len / 8; 72 while (count--) { 73 crc = __crc32d(crc, *dword_buf); 74 dword_buf++; 75 } 76 77 return crc; 78 } 79 80 #else 81 82 uint32_t 83 crc32_update(const struct spdk_crc32_table *table, const void *buf, size_t len, uint32_t crc) 84 { 85 const uint8_t *buf_u8 = buf; 86 size_t i; 87 88 for (i = 0; i < len; i++) { 89 crc = (crc >> 8) ^ table->table[(crc ^ buf_u8[i]) & 0xff]; 90 } 91 92 return crc; 93 } 94 95 #endif 96