lib/raid6/x86.h

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 2002-2004 H. Peter Anvin - All Rights Reserved
   4  *
   5  *   This program is free software; you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License as published by
   7  *   the Free Software Foundation, Inc., 53 Temple Place Ste 330,
   8  *   Boston MA 02111-1307, USA; either version 2 of the License, or
   9  *   (at your option) any later version; incorporated herein by reference.
  10  *
  11  * ----------------------------------------------------------------------- */
  12
  13 /*
  14  * raid6/x86.h
  15  *
  16  * Definitions common to x86 and x86-64 RAID-6 code only
  17  */
  18
  19 #ifndef LINUX_RAID_RAID6X86_H
  20 #define LINUX_RAID_RAID6X86_H
  21
  22 #if (defined(__i386__) || defined(__x86_64__)) && !defined(__arch_um__)
  23
  24 #ifdef __KERNEL__ /* Real code */
  25
  26 #include <asm/fpu/api.h>
  27
  28 #else /* Dummy code for user space testing */
  29
  30 static inline void kernel_fpu_begin(void)
  31 {
  32 }
  33
  34 static inline void kernel_fpu_end(void)
  35 {
  36 }
  37
  38 #define __aligned(x) __attribute__((aligned(x)))
  39
  40 #define X86_FEATURE_MMX         (0*32+23) /* Multimedia Extensions */
  41 #define X86_FEATURE_FXSR        (0*32+24) /* FXSAVE and FXRSTOR instructions
  42                                            * (fast save and restore) */
  43 #define X86_FEATURE_XMM         (0*32+25) /* Streaming SIMD Extensions */
  44 #define X86_FEATURE_XMM2        (0*32+26) /* Streaming SIMD Extensions-2 */
  45 #define X86_FEATURE_XMM3        (4*32+ 0) /* "pni" SSE-3 */
  46 #define X86_FEATURE_SSSE3       (4*32+ 9) /* Supplemental SSE-3 */
  47 #define X86_FEATURE_AVX (4*32+28) /* Advanced Vector Extensions */
  48 #define X86_FEATURE_AVX2        (9*32+ 5) /* AVX2 instructions */
  49 #define X86_FEATURE_MMXEXT      (1*32+22) /* AMD MMX extensions */
  50
  51 /* Should work well enough on modern CPUs for testing */
  52 static inline int boot_cpu_has(int flag)
  53 {
  54         u32 eax, ebx, ecx, edx;
  55
  56         eax = (flag & 0x100) ? 7 :
  57                 (flag & 0x20) ? 0x80000001 : 1;
  58         ecx = 0;
  59
  60         asm volatile("cpuid"
  61                      : "+a" (eax), "=b" (ebx), "=d" (edx), "+c" (ecx));
  62
  63         return ((flag & 0x100 ? ebx :
  64                 (flag & 0x80) ? ecx : edx) >> (flag & 31)) & 1;
  65 }
  66
  67 #endif /* ndef __KERNEL__ */
  68
  69 #endif
  70 #endif