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
  40extern int fpregs_get(struct task_struct *target,
  41                      const struct user_regset *regset,
  42                      unsigned int pos, unsigned int count,
  43                      void *kbuf, void __user *ubuf);
  44
  45static inline void __unlazy_fpu(struct task_struct *tsk, struct pt_regs *regs)
  46{
  47        if (task_thread_info(tsk)->status & TS_USEDFPU) {
  48                task_thread_info(tsk)->status &= ~TS_USEDFPU;
  49                save_fpu(tsk);
  50                release_fpu(regs);
  51        } else
  52                tsk->thread.fpu_counter = 0;
  53}
  54
  55static inline void unlazy_fpu(struct task_struct *tsk, struct pt_regs *regs)
  56{
  57        preempt_disable();
  58        __unlazy_fpu(tsk, regs);
  59        preempt_enable();
  60}
  61
  62static inline void clear_fpu(struct task_struct *tsk, struct pt_regs *regs)
  63{
  64        preempt_disable();
  65        if (task_thread_info(tsk)->status & TS_USEDFPU) {
  66                task_thread_info(tsk)->status &= ~TS_USEDFPU;
  67                release_fpu(regs);
  68        }
  69        preempt_enable();
  70}
  71
  72#endif /* __ASSEMBLY__ */
  73
  74#endif /* __ASM_SH_FPU_H */
  75