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author | H. Peter Anvin <hpa@zytor.com> | 2008-07-30 00:30:29 (GMT) |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-07-30 17:49:36 (GMT) |
commit | b4a091a62c8e91d6077e575600363cff73fa02ef (patch) | |
tree | 3a8033e2954163df5c12faf147d1e1c66090449b | |
parent | 42deec6f2c3688fdaf986225ac901b817cd91568 (diff) | |
download | linux-fsl-qoriq-b4a091a62c8e91d6077e575600363cff73fa02ef.tar.xz |
x86, xsave: add <asm/xcr.h> header file for XCR registers
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>
-rw-r--r-- | include/asm-x86/xcr.h | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/include/asm-x86/xcr.h b/include/asm-x86/xcr.h new file mode 100644 index 0000000..f2cba4e7 --- /dev/null +++ b/include/asm-x86/xcr.h @@ -0,0 +1,49 @@ +/* -*- 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 */ |