1 #ifndef __ASM_SH_FPU_H
2 #define __ASM_SH_FPU_H
3
4 #ifndef __ASSEMBLY__
5
6 struct task_struct;
7
8 #ifdef CONFIG_SH_FPU
release_fpu(struct pt_regs * regs)9 static inline void release_fpu(struct pt_regs *regs)
10 {
11 regs->sr |= SR_FD;
12 }
13
grab_fpu(struct pt_regs * regs)14 static inline void grab_fpu(struct pt_regs *regs)
15 {
16 regs->sr &= ~SR_FD;
17 }
18
19 extern void save_fpu(struct task_struct *__tsk);
20 extern void restore_fpu(struct task_struct *__tsk);
21 extern void fpu_state_restore(struct pt_regs *regs);
22 extern 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
32 struct user_regset;
33
34 extern int do_fpu_inst(unsigned short, struct pt_regs *);
35 extern int init_fpu(struct task_struct *);
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
__unlazy_fpu(struct task_struct * tsk,struct pt_regs * regs)42 static 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
unlazy_fpu(struct task_struct * tsk,struct pt_regs * regs)52 static 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
clear_fpu(struct task_struct * tsk,struct pt_regs * regs)59 static 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 */
72