include/asm-sh/fpu.h

   1 #ifndef __ASM_SH_FPU_H
   2 #define __ASM_SH_FPU_H
   3
   4 #ifndef __ASSEMBLY__
   5 #include <linux/preempt.h>
   6 #include <asm/ptrace.h>
   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 struct task_struct;
  20
  21 extern void save_fpu(struct task_struct *__tsk, struct pt_regs *regs);
  22 #else
  23
  24 #define release_fpu(regs)       do { } while (0)
  25 #define grab_fpu(regs)          do { } while (0)
  26
  27 static inline void save_fpu(struct task_struct *tsk, struct pt_regs *regs)
  28 {
  29         clear_tsk_thread_flag(tsk, TIF_USEDFPU);
  30 }
  31 #endif
  32
  33 extern int do_fpu_inst(unsigned short, struct pt_regs *);
  34
  35 static inline void unlazy_fpu(struct task_struct *tsk, struct pt_regs *regs)
  36 {
  37         preempt_disable();
  38         if (test_tsk_thread_flag(tsk, TIF_USEDFPU))
  39                 save_fpu(tsk, regs);
  40         preempt_enable();
  41 }
  42
  43 static inline void clear_fpu(struct task_struct *tsk, struct pt_regs *regs)
  44 {
  45         preempt_disable();
  46         if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) {
  47                 clear_tsk_thread_flag(tsk, TIF_USEDFPU);
  48                 release_fpu(regs);
  49         }
  50         preempt_enable();
  51 }
  52
  53 #endif /* __ASSEMBLY__ */
  54
  55 #endif /* __ASM_SH_FPU_H */