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
  25 static inline void kernel_fpu_begin(void)
  26 {
  27 }
  28
  29 static 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 */
  57 static 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