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
8 static __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
16 static 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 */
30 static __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
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