xref: /openbmc/linux/lib/raid6/x86.h (revision 2c684d89)
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/fpu/api.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 __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_AVX2        (9*32+ 5) /* AVX2 instructions */
49 #define X86_FEATURE_MMXEXT	(1*32+22) /* AMD MMX extensions */
50 
51 /* Should work well enough on modern CPUs for testing */
52 static inline int boot_cpu_has(int flag)
53 {
54 	u32 eax, ebx, ecx, edx;
55 
56 	eax = (flag & 0x100) ? 7 :
57 		(flag & 0x20) ? 0x80000001 : 1;
58 	ecx = 0;
59 
60 	asm volatile("cpuid"
61 		     : "+a" (eax), "=b" (ebx), "=d" (edx), "+c" (ecx));
62 
63 	return ((flag & 0x100 ? ebx :
64 		(flag & 0x80) ? ecx : edx) >> (flag & 31)) & 1;
65 }
66 
67 #endif /* ndef __KERNEL__ */
68 
69 #endif
70 #endif
71