x86.h

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/* ----------------------------------------------------------------------- *
 *
 *   Copyright 2002-2004 H. Peter Anvin - All Rights Reserved
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, Inc., 53 Temple Place Ste 330,
 *   Boston MA 02111-1307, USA; either version 2 of the License, or
 *   (at your option) any later version; incorporated herein by reference.
 *
 * ----------------------------------------------------------------------- */

/*
 * raid6/x86.h
 *
 * Definitions common to x86 and x86-64 RAID-6 code only
 */

#ifndef LINUX_RAID_RAID6X86_H
#define LINUX_RAID_RAID6X86_H

#if (defined(__i386__) || defined(__x86_64__)) && !defined(__arch_um__)

#ifdef __KERNEL__ /* Real code */

#include <asm/i387.h>

#else /* Dummy code for user space testing */

static inline void kernel_fpu_begin(void)
{
}

static inline void kernel_fpu_end(void)
{
}

#define __aligned(x) __attribute__((aligned(x)))

#define X86_FEATURE_MMX     (0*32+23) /* Multimedia Extensions */
#define X86_FEATURE_FXSR    (0*32+24) /* FXSAVE and FXRSTOR instructions
                       * (fast save and restore) */
#define X86_FEATURE_XMM     (0*32+25) /* Streaming SIMD Extensions */
#define X86_FEATURE_XMM2    (0*32+26) /* Streaming SIMD Extensions-2 */
#define X86_FEATURE_XMM3    (4*32+ 0) /* "pni" SSE-3 */
#define X86_FEATURE_SSSE3   (4*32+ 9) /* Supplemental SSE-3 */
#define X86_FEATURE_AVX (4*32+28) /* Advanced Vector Extensions */
#define X86_FEATURE_MMXEXT  (1*32+22) /* AMD MMX extensions */

/* Should work well enough on modern CPUs for testing */
static inline int boot_cpu_has(int flag)
{
    u32 eax = (flag & 0x20) ? 0x80000001 : 1;
    u32 ecx, edx;

    asm volatile("cpuid"
             : "+a" (eax), "=d" (edx), "=c" (ecx)
             : : "ebx");

    return ((flag & 0x80 ? ecx : edx) >> (flag & 31)) & 1;
}

#endif /* ndef __KERNEL__ */

#endif
#endif