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

 1#ifndef __ASM_SH_FPU_H
 2#define __ASM_SH_FPU_H
 3
 4#ifndef __ASSEMBLY__
 5
 6struct task_struct;
 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
19extern void save_fpu(struct task_struct *__tsk);
20extern void restore_fpu(struct task_struct *__tsk);
21extern void fpu_state_restore(struct pt_regs *regs);
22extern 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
32struct user_regset;
33
34extern int do_fpu_inst(unsigned short, struct pt_regs *);
35extern int init_fpu(struct task_struct *);
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	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
52static 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
59static 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 */