| 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 | |
|---|
