linux/lib/raid6/x86.h
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   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
  30static inline void kernel_fpu_begin(void)
  31{
  32}
  33
  34static 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_MMXEXT      (1*32+22) /* AMD MMX extensions */
  49
  50/* Should work well enough on modern CPUs for testing */
  51static inline int boot_cpu_has(int flag)
  52{
  53        u32 eax = (flag & 0x20) ? 0x80000001 : 1;
  54        u32 ecx, edx;
  55
  56        asm volatile("cpuid"
  57                     : "+a" (eax), "=d" (edx), "=c" (ecx)
  58                     : : "ebx");
  59
  60        return ((flag & 0x80 ? ecx : edx) >> (flag & 31)) & 1;
  61}
  62
  63#endif /* ndef __KERNEL__ */
  64
  65#endif
  66#endif
  67
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