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- /* -*- linux-c -*- ------------------------------------------------------- *
- *
- * Copyright 2008 rPath, Inc. - All Rights Reserved
- *
- * This file is part of the Linux kernel, and is made available under
- * the terms of the GNU General Public License version 2 or (at your
- * option) any later version; incorporated herein by reference.
- *
- * ----------------------------------------------------------------------- */
-
- /*
- * asm-x86/xcr.h
- *
- * Definitions for the eXtended Control Register instructions
- */
-
- #ifndef _ASM_X86_XCR_H
- #define _ASM_X86_XCR_H
-
- #define XCR_XFEATURE_ENABLED_MASK 0x00000000
-
- #ifdef __KERNEL__
- # ifndef __ASSEMBLY__
-
- #include <linux/types.h>
-
- static inline u64 xgetbv(u32 index)
- {
- u32 eax, edx;
-
- asm volatile(".byte 0x0f,0x01,0xd0" /* xgetbv */
- : "=a" (eax), "=d" (edx)
- : "c" (index));
- return eax + ((u64)edx << 32);
- }
-
- static inline void xsetbv(u32 index, u64 value)
- {
- u32 eax = value;
- u32 edx = value >> 32;
-
- asm volatile(".byte 0x0f,0x01,0xd1" /* xsetbv */
- : : "a" (eax), "d" (edx), "c" (index));
- }
-
- # endif /* __ASSEMBLY__ */
- #endif /* __KERNEL__ */
-
- #endif /* _ASM_X86_XCR_H */
-