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/i387.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 X86_FEATURE_MMX         (0*32+23) /* Multimedia Extensions */
  39 #define X86_FEATURE_FXSR        (0*32+24) /* FXSAVE and FXRSTOR instructions
  40                                            * (fast save and restore) */
  41 #define X86_FEATURE_XMM         (0*32+25) /* Streaming SIMD Extensions */
  42 #define X86_FEATURE_XMM2        (0*32+26) /* Streaming SIMD Extensions-2 */
  43 #define X86_FEATURE_MMXEXT      (1*32+22) /* AMD MMX extensions */
  44
  45 /* Should work well enough on modern CPUs for testing */
  46 static inline int boot_cpu_has(int flag)
  47 {
  48         u32 eax = (flag >> 5) ? 0x80000001 : 1;
  49         u32 edx;
  50
  51         asm volatile("cpuid"
  52                      : "+a" (eax), "=d" (edx)
  53                      : : "ecx", "ebx");
  54
  55         return (edx >> (flag & 31)) & 1;
  56 }
  57
  58 #endif /* ndef __KERNEL__ */
  59
  60 #endif
  61 #endif