projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b4a091a6 PA |
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 */ |