1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 1994 Linus Torvalds 4 * 5 * Pentium III FXSR, SSE support 6 * General FPU state handling cleanups 7 * Gareth Hughes <gareth@valinux.com>, May 2000 8 * x86-64 work by Andi Kleen 2002 9 */ 10 11 #ifndef _ASM_X86_FPU_API_H 12 #define _ASM_X86_FPU_API_H 13 14 /* 15 * Use kernel_fpu_begin/end() if you intend to use FPU in kernel context. It 16 * disables preemption so be careful if you intend to use it for long periods 17 * of time. 18 * If you intend to use the FPU in softirq you need to check first with 19 * irq_fpu_usable() if it is possible. 20 */ 21 extern void kernel_fpu_begin(void); 22 extern void kernel_fpu_end(void); 23 extern bool irq_fpu_usable(void); 24 25 /* 26 * Query the presence of one or more xfeatures. Works on any legacy CPU as well. 27 * 28 * If 'feature_name' is set then put a human-readable description of 29 * the feature there as well - this can be used to print error (or success) 30 * messages. 31 */ 32 extern int cpu_has_xfeatures(u64 xfeatures_mask, const char **feature_name); 33 34 #endif /* _ASM_X86_FPU_API_H */ 35