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dm raid1: switch read_record from kmalloc to slab to save memory
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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 * Bostom 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 * raid6x86.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