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Linux/arch/sh/include/asm/fpu.h

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  1 #ifndef __ASM_SH_FPU_H
  2 #define __ASM_SH_FPU_H
  3 
  4 #ifndef __ASSEMBLY__
  5 
  6 #include <asm/ptrace.h>
  7 
  8 struct task_struct;
  9 
 10 #ifdef CONFIG_SH_FPU
 11 static inline void release_fpu(struct pt_regs *regs)
 12 {
 13         regs->sr |= SR_FD;
 14 }
 15 
 16 static inline void grab_fpu(struct pt_regs *regs)
 17 {
 18         regs->sr &= ~SR_FD;
 19 }
 20 
 21 extern void save_fpu(struct task_struct *__tsk);
 22 extern void restore_fpu(struct task_struct *__tsk);
 23 extern void fpu_state_restore(struct pt_regs *regs);
 24 extern void __fpu_state_restore(void);
 25 #else
 26 #define save_fpu(tsk)                   do { } while (0)
 27 #define restore_fpu(tsk)                do { } while (0)
 28 #define release_fpu(regs)               do { } while (0)
 29 #define grab_fpu(regs)                  do { } while (0)
 30 #define fpu_state_restore(regs)         do { } while (0)
 31 #define __fpu_state_restore(regs)       do { } while (0)
 32 #endif
 33 
 34 struct user_regset;
 35 
 36 extern int do_fpu_inst(unsigned short, struct pt_regs *);
 37 extern int init_fpu(struct task_struct *);
 38 
 39 extern int fpregs_get(struct task_struct *target,
 40                       const struct user_regset *regset,
 41                       unsigned int pos, unsigned int count,
 42                       void *kbuf, void __user *ubuf);
 43 
 44 static inline void __unlazy_fpu(struct task_struct *tsk, struct pt_regs *regs)
 45 {
 46         if (task_thread_info(tsk)->status & TS_USEDFPU) {
 47                 task_thread_info(tsk)->status &= ~TS_USEDFPU;
 48                 save_fpu(tsk);
 49                 release_fpu(regs);
 50         } else
 51                 tsk->thread.fpu_counter = 0;
 52 }
 53 
 54 static inline void unlazy_fpu(struct task_struct *tsk, struct pt_regs *regs)
 55 {
 56         preempt_disable();
 57         __unlazy_fpu(tsk, regs);
 58         preempt_enable();
 59 }
 60 
 61 static inline void clear_fpu(struct task_struct *tsk, struct pt_regs *regs)
 62 {
 63         preempt_disable();
 64         if (task_thread_info(tsk)->status & TS_USEDFPU) {
 65                 task_thread_info(tsk)->status &= ~TS_USEDFPU;
 66                 release_fpu(regs);
 67         }
 68         preempt_enable();
 69 }
 70 
 71 #endif /* __ASSEMBLY__ */
 72 
 73 #endif /* __ASM_SH_FPU_H */
 74 

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