1b4fb8545f
The xgetbv() function is needed in the pre-decompression boot code, but asm/fpu/internal.h can't be included there directly. Doing so opens the door to include-hell due to various include-magic in boot/compressed/misc.h. Avoid that by moving xgetbv()/xsetbv() to a separate header file and include it instead. Signed-off-by: Joerg Roedel <jroedel@suse.de> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20200907131613.12703-27-joro@8bytes.org
35 lines
649 B
C
35 lines
649 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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/*
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* MXCSR and XCR definitions:
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*/
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static inline void ldmxcsr(u32 mxcsr)
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{
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asm volatile("ldmxcsr %0" :: "m" (mxcsr));
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}
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extern unsigned int mxcsr_feature_mask;
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#define XCR_XFEATURE_ENABLED_MASK 0x00000000
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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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#endif /* _ASM_X86_FPU_XCR_H */
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