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1 | /* -*- linux-c -*- ------------------------------------------------------- * |
2 | * | |
3 | * Copyright 2008 rPath, Inc. - All Rights Reserved | |
4 | * | |
5 | * This file is part of the Linux kernel, and is made available under | |
6 | * the terms of the GNU General Public License version 2 or (at your | |
7 | * option) any later version; incorporated herein by reference. | |
8 | * | |
9 | * ----------------------------------------------------------------------- */ | |
10 | ||
11 | /* | |
12 | * asm-x86/xcr.h | |
13 | * | |
14 | * Definitions for the eXtended Control Register instructions | |
15 | */ | |
16 | ||
17 | #ifndef _ASM_X86_XCR_H | |
18 | #define _ASM_X86_XCR_H | |
19 | ||
20 | #define XCR_XFEATURE_ENABLED_MASK 0x00000000 | |
21 | ||
22 | #ifdef __KERNEL__ | |
23 | # ifndef __ASSEMBLY__ | |
24 | ||
25 | #include <linux/types.h> | |
26 | ||
27 | static inline u64 xgetbv(u32 index) | |
28 | { | |
29 | u32 eax, edx; | |
30 | ||
31 | asm volatile(".byte 0x0f,0x01,0xd0" /* xgetbv */ | |
32 | : "=a" (eax), "=d" (edx) | |
33 | : "c" (index)); | |
34 | return eax + ((u64)edx << 32); | |
35 | } | |
36 | ||
37 | static inline void xsetbv(u32 index, u64 value) | |
38 | { | |
39 | u32 eax = value; | |
40 | u32 edx = value >> 32; | |
41 | ||
42 | asm volatile(".byte 0x0f,0x01,0xd1" /* xsetbv */ | |
43 | : : "a" (eax), "d" (edx), "c" (index)); | |
44 | } | |
45 | ||
46 | # endif /* __ASSEMBLY__ */ | |
47 | #endif /* __KERNEL__ */ | |
48 | ||
49 | #endif /* _ASM_X86_XCR_H */ |