xref: /openbmc/linux/arch/sh/include/asm/fpu.h (revision 293d5b43)
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
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 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 
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->thread.fpu_counter = 0;
50 }
51 
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 
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