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
   9 struct task_struct;
  10
  11 #ifdef CONFIG_SH_FPU
  12 static inline void release_fpu(struct pt_regs *regs)
  13 {
  14         regs->sr |= SR_FD;
  15 }
  16
  17 static inline void grab_fpu(struct pt_regs *regs)
  18 {
  19         regs->sr &= ~SR_FD;
  20 }
  21
  22 extern void save_fpu(struct task_struct *__tsk);
  23 extern void restore_fpu(struct task_struct *__tsk);
  24 extern void fpu_state_restore(struct pt_regs *regs);
  25 extern 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
  35 struct user_regset;
  36
  37 extern int do_fpu_inst(unsigned short, struct pt_regs *);
  38 extern int init_fpu(struct task_struct *);
  39
  40 static 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
  50 static 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
  57 static 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 */