1/*- 2 * Copyright (c) 2017 Michael Tuexen 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 */ 27 28#include <machine/asm.h> 29__FBSDID("$FreeBSD$"); 30.arch armv8-a+crc 31 32/* 33 * uint32_t 34 * armv8_crc32c(uint32_t crc, const unsigned char *buf, unsigned int len) 35 */ 36 37ENTRY(armv8_crc32c) 38 cbz w2, end 39 tbz x1, #0x0, half_word_aligned 40 sub w2, w2, 0x1 41 ldr w10, [x1], #0x1 42 crc32cb w0, w0, w10 43half_word_aligned: 44 cmp w2, #0x2 45 b.lo last_byte 46 tbz x1, #0x1, word_aligned 47 sub w2, w2, 0x2 48 ldr w10, [x1], #0x2 49 crc32ch w0, w0, w10 50word_aligned: 51 cmp w2, #0x4 52 b.lo last_half_word 53 tbz x1, #0x2, double_word_aligned 54 sub w2, w2, 0x4 55 ldr w10, [x1], #0x4 56 crc32cw w0, w0, w10 57double_word_aligned: 58 lsr w9, w2, #0x3 59 cbz w9, last_word 60loop: 61 ldr x10, [x1], #0x8 62 crc32cx w0, w0, x10 63 subs w9, w9, #1 64 b.ne loop 65last_word: 66 tbz w2, #0x2, last_half_word 67 ldr w10, [x1], #0x4 68 crc32cw w0, w0, w10 69last_half_word: 70 tbz w2, #0x1, last_byte 71 ldr w10, [x1], #0x2 72 crc32ch w0, w0, w10 73last_byte: 74 tbz w2, #0x0, end 75 ldr w10, [x1], #0x1 76 crc32cb w0, w0, w10 77end: 78 ret 79END(armv8_crc32c) 80