arch/x86/include/asm/fpu/api.h

   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 */