36 lines
793 B
C
36 lines
793 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_FPU_XCR_H
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#define _ASM_X86_FPU_XCR_H
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#define XCR_XFEATURE_ENABLED_MASK 0x00000000
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#define XCR_XFEATURE_IN_USE_MASK 0x00000001
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static inline u64 xgetbv(u32 index)
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{
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u32 eax, edx;
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asm volatile("xgetbv" : "=a" (eax), "=d" (edx) : "c" (index));
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return eax + ((u64)edx << 32);
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}
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static inline void xsetbv(u32 index, u64 value)
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{
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u32 eax = value;
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u32 edx = value >> 32;
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asm volatile("xsetbv" :: "a" (eax), "d" (edx), "c" (index));
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}
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/*
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* Return a mask of xfeatures which are currently being tracked
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* by the processor as being in the initial configuration.
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*
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* Callers should check X86_FEATURE_XGETBV1.
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*/
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static inline u64 xfeatures_in_use(void)
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{
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return xgetbv(XCR_XFEATURE_IN_USE_MASK);
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}
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#endif /* _ASM_X86_FPU_XCR_H */
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