LXR linux/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
   9static inline void release_fpu(struct pt_regs *regs)
  10{
  11        regs->sr |= SR_FD;
  12}
  13
  14static inline void grab_fpu(struct pt_regs *regs)
  15{
  16        regs->sr &= ~SR_FD;
  17}
  18
  19struct task_struct;
  20
  21extern 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
  27static 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
  33struct user_regset;
  34
  35extern int do_fpu_inst(unsigned short, struct pt_regs *);
  36
  37extern 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
  42static 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
  50static 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
  60static 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 */
  75