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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* ----------------------------------------------------------------------- *
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,
Atsushi SAKAI93ed05e2009-03-31 14:57:37 +11008 * Boston MA 02111-1307, USA; either version 2 of the License, or
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * (at your option) any later version; incorporated herein by reference.
10 *
11 * ----------------------------------------------------------------------- */
12
13/*
NeilBrowna8e026c2010-08-12 06:44:54 +100014 * raid6/x86.h
Linus Torvalds1da177e2005-04-16 15:20:36 -070015 *
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
Al Viroca5cd872007-10-29 04:31:16 +000022#if (defined(__i386__) || defined(__x86_64__)) && !defined(__arch_um__)
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#ifdef __KERNEL__ /* Real code */
25
H. Peter Anvina7234062007-02-28 20:11:25 -080026#include <asm/i387.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027
28#else /* Dummy code for user space testing */
29
H. Peter Anvina7234062007-02-28 20:11:25 -080030static inline void kernel_fpu_begin(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070031{
Linus Torvalds1da177e2005-04-16 15:20:36 -070032}
33
H. Peter Anvina7234062007-02-28 20:11:25 -080034static inline void kernel_fpu_end(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070035{
Linus Torvalds1da177e2005-04-16 15:20:36 -070036}
37
H. Peter Anvina7234062007-02-28 20:11:25 -080038#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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
H. Peter Anvina7234062007-02-28 20:11:25 -080045/* Should work well enough on modern CPUs for testing */
46static inline int boot_cpu_has(int flag)
Linus Torvalds1da177e2005-04-16 15:20:36 -070047{
H. Peter Anvina7234062007-02-28 20:11:25 -080048 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -070056}
57
Linus Torvalds1da177e2005-04-16 15:20:36 -070058#endif /* ndef __KERNEL__ */
59
60#endif
61#endif