projects / mirror_ubuntu-kernels.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 1eeaed76 RM |
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 | ||
| df6b35f4 IM |
11 | #ifndef _ASM_X86_FPU_API_H |
| 12 | #define _ASM_X86_FPU_API_H | |
| 1eeaed76 | 13 | |
| b1a74bf8 SS |
14 | /* |
| 15 | * Careful: __kernel_fpu_begin/end() must be called with preempt disabled | |
| 16 | * and they don't touch the preempt state on their own. | |
| 17 | * If you enable preemption after __kernel_fpu_begin(), preempt notifier | |
| 18 | * should call the __kernel_fpu_end() to prevent the kernel/user FPU | |
| 19 | * state from getting corrupted. KVM for example uses this model. | |
| 20 | * | |
| 21 | * All other cases use kernel_fpu_begin/end() which disable preemption | |
| 22 | * during kernel FPU usage. | |
| 23 | */ | |
| 24 | extern void __kernel_fpu_begin(void); | |
| 25 | extern void __kernel_fpu_end(void); | |
| d63e79b1 IM |
26 | extern void kernel_fpu_begin(void); |
| 27 | extern void kernel_fpu_end(void); | |
| 952f07ec | 28 | extern bool irq_fpu_usable(void); |
| 1eeaed76 | 29 | |
| 5b073430 IM |
30 | /* |
| 31 | * Query the presence of one or more xfeatures. Works on any legacy CPU as well. | |
| 32 | * | |
| 33 | * If 'feature_name' is set then put a human-readable description of | |
| 34 | * the feature there as well - this can be used to print error (or success) | |
| 35 | * messages. | |
| 36 | */ | |
| 37 | extern int cpu_has_xfeatures(u64 xfeatures_mask, const char **feature_name); | |
| 38 | ||
| df6b35f4 | 39 | #endif /* _ASM_X86_FPU_API_H */ |