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 "spdk/crc32.h" 35 36 void 37 spdk_crc32_table_init(struct spdk_crc32_table *table, uint32_t polynomial_reflect) 38 { 39 int i, j; 40 uint32_t val; 41 42 for (i = 0; i < 256; i++) { 43 val = i; 44 for (j = 0; j < 8; j++) { 45 if (val & 1) { 46 val = (val >> 1) ^ polynomial_reflect; 47 } else { 48 val = (val >> 1); 49 } 50 } 51 table->table[i] = val; 52 } 53 } 54 55 #ifdef SPDK_HAVE_ARM_CRC 56 57 uint32_t 58 spdk_crc32_update(const struct spdk_crc32_table *table, const void *buf, size_t len, uint32_t crc) 59 { 60 size_t count; 61 const uint64_t *dword_buf; 62 63 count = len & 7; 64 while (count--) { 65 crc = __crc32b(crc, *(const uint8_t *)buf); 66 buf++; 67 } 68 dword_buf = (const uint64_t *)buf; 69 70 count = len / 8; 71 while (count--) { 72 crc = __crc32d(crc, *dword_buf); 73 dword_buf++; 74 } 75 76 return crc; 77 } 78 79 #else 80 81 uint32_t 82 spdk_crc32_update(const struct spdk_crc32_table *table, const void *buf, size_t len, uint32_t crc) 83 { 84 const uint8_t *buf_u8 = buf; 85 size_t i; 86 87 for (i = 0; i < len; i++) { 88 crc = (crc >> 8) ^ table->table[(crc ^ buf_u8[i]) & 0xff]; 89 } 90 91 return crc; 92 } 93 94 #endif 95