crc32c_armv8.S

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    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 
   31 .arch_extension crc
   32 
   33 /*
   34  * uint32_t
   35  * armv8_crc32c(uint32_t crc, const unsigned char *buf, unsigned int len)
   36  */
   37 
   38 ENTRY(armv8_crc32c)
   39         cbz     w2, end
   40         tbz     x1, #0x0, half_word_aligned
   41         sub     w2, w2, 0x1
   42         ldr     w10, [x1], #0x1
   43         crc32cb w0, w0, w10
   44 half_word_aligned:
   45         cmp     w2, #0x2
   46         b.lo    last_byte
   47         tbz     x1, #0x1, word_aligned
   48         sub     w2, w2, 0x2
   49         ldr     w10, [x1], #0x2
   50         crc32ch w0, w0, w10
   51 word_aligned:
   52         cmp     w2, #0x4
   53         b.lo    last_half_word
   54         tbz     x1, #0x2, double_word_aligned
   55         sub     w2, w2, 0x4
   56         ldr     w10, [x1], #0x4
   57         crc32cw w0, w0, w10
   58 double_word_aligned:
   59         lsr     w9, w2, #0x3
   60         cbz     w9, last_word
   61 loop:
   62         ldr     x10, [x1], #0x8
   63         crc32cx w0, w0, x10
   64         subs    w9, w9, #1
   65         b.ne    loop
   66 last_word:
   67         tbz     w2, #0x2, last_half_word
   68         ldr     w10, [x1], #0x4
   69         crc32cw w0, w0, w10
   70 last_half_word:
   71         tbz     w2, #0x1, last_byte
   72         ldr     w10, [x1], #0x2
   73         crc32ch w0, w0, w10
   74 last_byte:
   75         tbz     w2, #0x0, end 
   76         ldr     w10, [x1], #0x1
   77         crc32cb w0, w0, w10
   78 end:
   79         ret
   80 END(armv8_crc32c)

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FreeBSD/Linux Kernel Cross Reference sys/libkern/arm64/crc32c_armv8.S

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sys/libkern/arm64/crc32c_armv8.S