LXR linux/arch/sh/include/asm/fpu.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef __ASM_SH_FPU_H
   3#define __ASM_SH_FPU_H
   4
   5#ifndef __ASSEMBLY__
   6
   7#include <asm/ptrace.h>
   8
   9struct task_struct;
  10
  11#ifdef CONFIG_SH_FPU
  12static inline void release_fpu(struct pt_regs *regs)
  13{
  14        regs->sr |= SR_FD;
  15}
  16
  17static inline void grab_fpu(struct pt_regs *regs)
  18{
  19        regs->sr &= ~SR_FD;
  20}
  21
  22extern void save_fpu(struct task_struct *__tsk);
  23extern void restore_fpu(struct task_struct *__tsk);
  24extern void fpu_state_restore(struct pt_regs *regs);
  25extern void __fpu_state_restore(void);
  26#else
  27#define save_fpu(tsk)                   do { } while (0)
  28#define restore_fpu(tsk)                do { } while (0)
  29#define release_fpu(regs)               do { } while (0)
  30#define grab_fpu(regs)                  do { } while (0)
  31#define fpu_state_restore(regs)         do { } while (0)
  32#define __fpu_state_restore(regs)       do { } while (0)
  33#endif
  34
  35struct user_regset;
  36
  37extern int do_fpu_inst(unsigned short, struct pt_regs *);
  38extern int init_fpu(struct task_struct *);
  39
  40static inline void __unlazy_fpu(struct task_struct *tsk, struct pt_regs *regs)
  41{
  42        if (task_thread_info(tsk)->status & TS_USEDFPU) {
  43                task_thread_info(tsk)->status &= ~TS_USEDFPU;
  44                save_fpu(tsk);
  45                release_fpu(regs);
  46        } else
  47                tsk->thread.fpu_counter = 0;
  48}
  49
  50static inline void unlazy_fpu(struct task_struct *tsk, struct pt_regs *regs)
  51{
  52        preempt_disable();
  53        __unlazy_fpu(tsk, regs);
  54        preempt_enable();
  55}
  56
  57static inline void clear_fpu(struct task_struct *tsk, struct pt_regs *regs)
  58{
  59        preempt_disable();
  60        if (task_thread_info(tsk)->status & TS_USEDFPU) {
  61                task_thread_info(tsk)->status &= ~TS_USEDFPU;
  62                release_fpu(regs);
  63        }
  64        preempt_enable();
  65}
  66
  67#endif /* __ASSEMBLY__ */
  68
  69#endif /* __ASM_SH_FPU_H */
  70