b4a091a62c
Add <asm-x86/xcr.h> header file for the XCR registers and their access functions. Signed-off-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
/* -*- linux-c -*- ------------------------------------------------------- *
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*
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* Copyright 2008 rPath, Inc. - All Rights Reserved
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*
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* This file is part of the Linux kernel, and is made available under
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* the terms of the GNU General Public License version 2 or (at your
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* option) any later version; incorporated herein by reference.
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*
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* ----------------------------------------------------------------------- */
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/*
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* asm-x86/xcr.h
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*
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* Definitions for the eXtended Control Register instructions
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*/
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#ifndef _ASM_X86_XCR_H
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#define _ASM_X86_XCR_H
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#define XCR_XFEATURE_ENABLED_MASK 0x00000000
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#ifdef __KERNEL__
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# ifndef __ASSEMBLY__
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#include <linux/types.h>
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static inline u64 xgetbv(u32 index)
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{
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u32 eax, edx;
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asm volatile(".byte 0x0f,0x01,0xd0" /* xgetbv */
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: "=a" (eax), "=d" (edx)
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: "c" (index));
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return eax + ((u64)edx << 32);
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}
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static inline void xsetbv(u32 index, u64 value)
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{
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u32 eax = value;
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u32 edx = value >> 32;
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asm volatile(".byte 0x0f,0x01,0xd1" /* xsetbv */
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: : "a" (eax), "d" (edx), "c" (index));
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}
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# endif /* __ASSEMBLY__ */
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#endif /* __KERNEL__ */
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#endif /* _ASM_X86_XCR_H */
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