include/os/freebsd/spl/sys/simd_arm.h

   1 /*
   2  * Copyright (C) 2022 Tino Reichardt <milky-zfs@mcmilk.de>
   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 AUTHORS 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 AUTHORS 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  * $FreeBSD$
  27  */
  28
  29 /*
  30  * SIMD support:
  31  *
  32  * Following functions should be called to determine whether CPU feature
  33  * is supported. All functions are usable in kernel and user space.
  34  * If a SIMD algorithm is using more than one instruction set
  35  * all relevant feature test functions should be called.
  36  *
  37  * Supported features:
  38  *   zfs_neon_available()
  39  *   zfs_sha256_available()
  40  */
  41
  42 #ifndef _FREEBSD_SIMD_ARM_H
  43 #define _FREEBSD_SIMD_ARM_H
  44
  45 #include <sys/types.h>
  46 #include <machine/elf.h>
  47 #include <machine/md_var.h>
  48
  49 #define kfpu_allowed()          1
  50 #define kfpu_initialize(tsk)    do {} while (0)
  51 #define kfpu_begin()            do {} while (0)
  52 #define kfpu_end()              do {} while (0)
  53 #define kfpu_init()             (0)
  54 #define kfpu_fini()             do {} while (0)
  55
  56 /*
  57  * Check if NEON is available
  58  */
  59 static inline boolean_t
  60 zfs_neon_available(void)
  61 {
  62         return (elf_hwcap & HWCAP_NEON);
  63 }
  64
  65 /*
  66  * Check if SHA256 is available
  67  */
  68 static inline boolean_t
  69 zfs_sha256_available(void)
  70 {
  71         return (elf_hwcap2 & HWCAP2_SHA2);
  72 }
  73
  74 #endif /* _FREEBSD_SIMD_ARM_H */