LXR linux/lib/raid6/x86.h

   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2/* ----------------------------------------------------------------------- *
   3 *
   4 *   Copyright 2002-2004 H. Peter Anvin - All Rights Reserved
   5 *
   6 * ----------------------------------------------------------------------- */
   7
   8/*
   9 * raid6/x86.h
  10 *
  11 * Definitions common to x86 and x86-64 RAID-6 code only
  12 */
  13
  14#ifndef LINUX_RAID_RAID6X86_H
  15#define LINUX_RAID_RAID6X86_H
  16
  17#if (defined(__i386__) || defined(__x86_64__)) && !defined(__arch_um__)
  18
  19#ifdef __KERNEL__ /* Real code */
  20
  21#include <asm/fpu/api.h>
  22
  23#else /* Dummy code for user space testing */
  24
  25static inline void kernel_fpu_begin(void)
  26{
  27}
  28
  29static inline void kernel_fpu_end(void)
  30{
  31}
  32
  33#define __aligned(x) __attribute__((aligned(x)))
  34
  35#define X86_FEATURE_MMX         (0*32+23) /* Multimedia Extensions */
  36#define X86_FEATURE_FXSR        (0*32+24) /* FXSAVE and FXRSTOR instructions
  37                                           * (fast save and restore) */
  38#define X86_FEATURE_XMM         (0*32+25) /* Streaming SIMD Extensions */
  39#define X86_FEATURE_XMM2        (0*32+26) /* Streaming SIMD Extensions-2 */
  40#define X86_FEATURE_XMM3        (4*32+ 0) /* "pni" SSE-3 */
  41#define X86_FEATURE_SSSE3       (4*32+ 9) /* Supplemental SSE-3 */
  42#define X86_FEATURE_AVX (4*32+28) /* Advanced Vector Extensions */
  43#define X86_FEATURE_AVX2        (9*32+ 5) /* AVX2 instructions */
  44#define X86_FEATURE_AVX512F     (9*32+16) /* AVX-512 Foundation */
  45#define X86_FEATURE_AVX512DQ    (9*32+17) /* AVX-512 DQ (Double/Quad granular)
  46                                           * Instructions
  47                                           */
  48#define X86_FEATURE_AVX512BW    (9*32+30) /* AVX-512 BW (Byte/Word granular)
  49                                           * Instructions
  50                                           */
  51#define X86_FEATURE_AVX512VL    (9*32+31) /* AVX-512 VL (128/256 Vector Length)
  52                                           * Extensions
  53                                           */
  54#define X86_FEATURE_MMXEXT      (1*32+22) /* AMD MMX extensions */
  55
  56/* Should work well enough on modern CPUs for testing */
  57static inline int boot_cpu_has(int flag)
  58{
  59        u32 eax, ebx, ecx, edx;
  60
  61        eax = (flag & 0x100) ? 7 :
  62                (flag & 0x20) ? 0x80000001 : 1;
  63        ecx = 0;
  64
  65        asm volatile("cpuid"
  66                     : "+a" (eax), "=b" (ebx), "=d" (edx), "+c" (ecx));
  67
  68        return ((flag & 0x100 ? ebx :
  69                (flag & 0x80) ? ecx : edx) >> (flag & 31)) & 1;
  70}
  71
  72#endif /* ndef __KERNEL__ */
  73
  74#endif
  75#endif
  76