arch/sh/include/asm/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 struct user_regset;
  34
  35 extern int do_fpu_inst(unsigned short, struct pt_regs *);
  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         preempt_disable();
  45         if (test_tsk_thread_flag(tsk, TIF_USEDFPU))
  46                 save_fpu(tsk, regs);
  47         preempt_enable();
  48 }
  49
  50 static inline void clear_fpu(struct task_struct *tsk, struct pt_regs *regs)
  51 {
  52         preempt_disable();
  53         if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) {
  54                 clear_tsk_thread_flag(tsk, TIF_USEDFPU);
  55                 release_fpu(regs);
  56         }
  57         preempt_enable();
  58 }
  59
  60 static inline int init_fpu(struct task_struct *tsk)
  61 {
  62         if (tsk_used_math(tsk)) {
  63                 if ((boot_cpu_data.flags & CPU_HAS_FPU) && tsk == current)
  64                         unlazy_fpu(tsk, task_pt_regs(tsk));
  65                 return 0;
  66         }
  67
  68         set_stopped_child_used_math(tsk);
  69         return 0;
  70 }
  71
  72 #endif /* __ASSEMBLY__ */
  73
  74 #endif /* __ASM_SH_FPU_H */