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 */
21extern void kernel_fpu_begin(void);
22extern void kernel_fpu_end(void);
23extern 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 */
32extern int cpu_has_xfeatures(u64 xfeatures_mask, const char **feature_name);
33
34#endif /* _ASM_X86_FPU_API_H */
35