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Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ASM_SH_FPU_H
3#define __ASM_SH_FPU_H
4
5#ifndef __ASSEMBLY__
6
7#include <asm/ptrace.h>
8
9struct task_struct;
10
11#ifdef CONFIG_SH_FPU
12static inline void release_fpu(struct pt_regs *regs)
13{
14 regs->sr |= SR_FD;
15}
16
17static inline void grab_fpu(struct pt_regs *regs)
18{
19 regs->sr &= ~SR_FD;
20}
21
22extern void save_fpu(struct task_struct *__tsk);
23extern void restore_fpu(struct task_struct *__tsk);
24extern void fpu_state_restore(struct pt_regs *regs);
25extern void __fpu_state_restore(void);
26#else
27#define save_fpu(tsk) do { } while (0)
28#define restore_fpu(tsk) do { } while (0)
29#define release_fpu(regs) do { } while (0)
30#define grab_fpu(regs) do { } while (0)
31#define fpu_state_restore(regs) do { } while (0)
32#define __fpu_state_restore(regs) do { } while (0)
33#endif
34
35struct user_regset;
36
37extern int do_fpu_inst(unsigned short, struct pt_regs *);
38extern int init_fpu(struct task_struct *);
39
40extern int fpregs_get(struct task_struct *target,
41 const struct user_regset *regset,
42 unsigned int pos, unsigned int count,
43 void *kbuf, void __user *ubuf);
44
45static inline void __unlazy_fpu(struct task_struct *tsk, struct pt_regs *regs)
46{
47 if (task_thread_info(tsk)->status & TS_USEDFPU) {
48 task_thread_info(tsk)->status &= ~TS_USEDFPU;
49 save_fpu(tsk);
50 release_fpu(regs);
51 } else
52 tsk->thread.fpu_counter = 0;
53}
54
55static inline void unlazy_fpu(struct task_struct *tsk, struct pt_regs *regs)
56{
57 preempt_disable();
58 __unlazy_fpu(tsk, regs);
59 preempt_enable();
60}
61
62static inline void clear_fpu(struct task_struct *tsk, struct pt_regs *regs)
63{
64 preempt_disable();
65 if (task_thread_info(tsk)->status & TS_USEDFPU) {
66 task_thread_info(tsk)->status &= ~TS_USEDFPU;
67 release_fpu(regs);
68 }
69 preempt_enable();
70}
71
72#endif /* __ASSEMBLY__ */
73
74#endif /* __ASM_SH_FPU_H */