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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1#ifndef __ASM_SH_FPU_H
2#define __ASM_SH_FPU_H
3
4#ifndef __ASSEMBLY__
5
6#include <asm/ptrace.h>
7
8struct task_struct;
9
10#ifdef CONFIG_SH_FPU
11static inline void release_fpu(struct pt_regs *regs)
12{
13 regs->sr |= SR_FD;
14}
15
16static inline void grab_fpu(struct pt_regs *regs)
17{
18 regs->sr &= ~SR_FD;
19}
20
21extern void save_fpu(struct task_struct *__tsk);
22extern void restore_fpu(struct task_struct *__tsk);
23extern void fpu_state_restore(struct pt_regs *regs);
24extern void __fpu_state_restore(void);
25#else
26#define save_fpu(tsk) do { } while (0)
27#define restore_fpu(tsk) do { } while (0)
28#define release_fpu(regs) do { } while (0)
29#define grab_fpu(regs) do { } while (0)
30#define fpu_state_restore(regs) do { } while (0)
31#define __fpu_state_restore(regs) do { } while (0)
32#endif
33
34struct user_regset;
35
36extern int do_fpu_inst(unsigned short, struct pt_regs *);
37extern int init_fpu(struct task_struct *);
38
39extern int fpregs_get(struct task_struct *target,
40 const struct user_regset *regset,
41 unsigned int pos, unsigned int count,
42 void *kbuf, void __user *ubuf);
43
44static inline void __unlazy_fpu(struct task_struct *tsk, struct pt_regs *regs)
45{
46 if (task_thread_info(tsk)->status & TS_USEDFPU) {
47 task_thread_info(tsk)->status &= ~TS_USEDFPU;
48 save_fpu(tsk);
49 release_fpu(regs);
50 } else
51 tsk->thread.fpu_counter = 0;
52}
53
54static inline void unlazy_fpu(struct task_struct *tsk, struct pt_regs *regs)
55{
56 preempt_disable();
57 __unlazy_fpu(tsk, regs);
58 preempt_enable();
59}
60
61static inline void clear_fpu(struct task_struct *tsk, struct pt_regs *regs)
62{
63 preempt_disable();
64 if (task_thread_info(tsk)->status & TS_USEDFPU) {
65 task_thread_info(tsk)->status &= ~TS_USEDFPU;
66 release_fpu(regs);
67 }
68 preempt_enable();
69}
70
71#endif /* __ASSEMBLY__ */
72
73#endif /* __ASM_SH_FPU_H */