forked from Minki/linux
a723406c4a
- Use kernel_fpu_begin() and kernel_fpu_end() - Use boot_cpu_has() for feature testing even in userspace Signed-off-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
62 lines
1.6 KiB
C
62 lines
1.6 KiB
C
/* ----------------------------------------------------------------------- *
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*
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* Copyright 2002-2004 H. Peter Anvin - All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, Inc., 53 Temple Place Ste 330,
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* Bostom MA 02111-1307, USA; either version 2 of the License, or
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* (at your option) any later version; incorporated herein by reference.
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*
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* ----------------------------------------------------------------------- */
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/*
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* raid6x86.h
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*
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* Definitions common to x86 and x86-64 RAID-6 code only
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*/
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#ifndef LINUX_RAID_RAID6X86_H
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#define LINUX_RAID_RAID6X86_H
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#if defined(__i386__) || defined(__x86_64__)
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#ifdef __KERNEL__ /* Real code */
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#include <asm/i387.h>
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#else /* Dummy code for user space testing */
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static inline void kernel_fpu_begin(void)
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{
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}
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static inline void kernel_fpu_end(void)
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{
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}
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#define X86_FEATURE_MMX (0*32+23) /* Multimedia Extensions */
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#define X86_FEATURE_FXSR (0*32+24) /* FXSAVE and FXRSTOR instructions
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* (fast save and restore) */
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#define X86_FEATURE_XMM (0*32+25) /* Streaming SIMD Extensions */
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#define X86_FEATURE_XMM2 (0*32+26) /* Streaming SIMD Extensions-2 */
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#define X86_FEATURE_MMXEXT (1*32+22) /* AMD MMX extensions */
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/* Should work well enough on modern CPUs for testing */
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static inline int boot_cpu_has(int flag)
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{
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u32 eax = (flag >> 5) ? 0x80000001 : 1;
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u32 edx;
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asm volatile("cpuid"
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: "+a" (eax), "=d" (edx)
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: : "ecx", "ebx");
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return (edx >> (flag & 31)) & 1;
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}
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#endif /* ndef __KERNEL__ */
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#endif
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#endif
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