mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 14:43:58 +08:00
bb8985586b
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
/* -*- 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 */
|