xref: /linux/arch/sh/include/asm/fpu.h (revision dfc349402de8e95f6a42e8341e9ea193b718eee3)
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 void fpu_state_restore(struct pt_regs *regs);
23 #else
24 
25 #define release_fpu(regs)	do { } while (0)
26 #define grab_fpu(regs)		do { } while (0)
27 
28 static inline void save_fpu(struct task_struct *tsk, struct pt_regs *regs)
29 {
30 	clear_tsk_thread_flag(tsk, TIF_USEDFPU);
31 }
32 #endif
33 
34 struct user_regset;
35 
36 extern int do_fpu_inst(unsigned short, struct pt_regs *);
37 
38 extern int fpregs_get(struct task_struct *target,
39 		      const struct user_regset *regset,
40 		      unsigned int pos, unsigned int count,
41 		      void *kbuf, void __user *ubuf);
42 
43 static inline void unlazy_fpu(struct task_struct *tsk, struct pt_regs *regs)
44 {
45 	preempt_disable();
46 	if (test_tsk_thread_flag(tsk, TIF_USEDFPU))
47 		save_fpu(tsk, regs);
48 	else
49 		tsk->fpu_counter = 0;
50 	preempt_enable();
51 }
52 
53 static inline void clear_fpu(struct task_struct *tsk, struct pt_regs *regs)
54 {
55 	preempt_disable();
56 	if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) {
57 		clear_tsk_thread_flag(tsk, TIF_USEDFPU);
58 		release_fpu(regs);
59 	}
60 	preempt_enable();
61 }
62 
63 static inline int init_fpu(struct task_struct *tsk)
64 {
65 	if (tsk_used_math(tsk)) {
66 		if ((boot_cpu_data.flags & CPU_HAS_FPU) && tsk == current)
67 			unlazy_fpu(tsk, task_pt_regs(tsk));
68 		return 0;
69 	}
70 
71 	set_stopped_child_used_math(tsk);
72 	return 0;
73 }
74 
75 #endif /* __ASSEMBLY__ */
76 
77 #endif /* __ASM_SH_FPU_H */
78