arch/sh/include/asm/fpu.h

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