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 */
36