xcr.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _ASM_X86_FPU_XCR_H
 3#define _ASM_X86_FPU_XCR_H
 4
 5#define XCR_XFEATURE_ENABLED_MASK	0x00000000
 6#define XCR_XFEATURE_IN_USE_MASK	0x00000001
 7
 8static __always_inline u64 xgetbv(u32 index)
 9{
10	u32 eax, edx;
11
12	asm volatile("xgetbv" : "=a" (eax), "=d" (edx) : "c" (index));
13	return eax + ((u64)edx << 32);
14}
15
16static inline void xsetbv(u32 index, u64 value)
17{
18	u32 eax = value;
19	u32 edx = value >> 32;
20
21	asm volatile("xsetbv" :: "a" (eax), "d" (edx), "c" (index));
22}
23
24/*
25 * Return a mask of xfeatures which are currently being tracked
26 * by the processor as being in the initial configuration.
27 *
28 * Callers should check X86_FEATURE_XGETBV1.
29 */
30static __always_inline u64 xfeatures_in_use(void)
31{
32	return xgetbv(XCR_XFEATURE_IN_USE_MASK);
33}
34
35#endif /* _ASM_X86_FPU_XCR_H */