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review.evervolv.com / android_kernel_oneplus_msm8996 / d3ea9fa0a563620fe9f416f94bb8927c64390917 / . / arch / sh / include / asm / fpu.h
blob: d7709c06fac46c11b8d3fde9204aea6d1ea74517 [file] [log] [blame]
Paul Mundt332fd572007-11-22 17:30:50 +0900[diff] [blame]1#ifndef __ASM_SH_FPU_H
2#define __ASM_SH_FPU_H
3
Paul Mundt332fd572007-11-22 17:30:50 +0900[diff] [blame]4#ifndef __ASSEMBLY__
Paul Mundt9bbafce2008-03-26 19:02:47 +0900[diff] [blame]5#include <linux/preempt.h>
Paul Mundt332fd572007-11-22 17:30:50 +0900[diff] [blame]6#include <asm/ptrace.h>
7
8#ifdef CONFIG_SH_FPU
9static inline void release_fpu(struct pt_regs *regs)
10{
11 regs->sr |= SR_FD;
12}
13
14static inline void grab_fpu(struct pt_regs *regs)
15{
16 regs->sr &= ~SR_FD;
17}
18
19struct task_struct;
20
Stuart Menefyd3ea9fa2009-09-25 18:25:10 +0100[diff] [blame^]21extern void save_fpu(struct task_struct *__tsk);
Giuseppe CAVALLAROa0458b02009-07-07 16:25:10 +0200[diff] [blame]22void fpu_state_restore(struct pt_regs *regs);
Paul Mundt332fd572007-11-22 17:30:50 +0900[diff] [blame]23#else
Paul Mundt138bed12008-03-26 19:09:21 +0900[diff] [blame]24
Stuart Menefyd3ea9fa2009-09-25 18:25:10 +0100[diff] [blame^]25#define save_fpu(tsk) do { } while (0)
Paul Mundt332fd572007-11-22 17:30:50 +0900[diff] [blame]26#define release_fpu(regs) do { } while (0)
27#define grab_fpu(regs) do { } while (0)
Paul Mundt138bed12008-03-26 19:09:21 +0900[diff] [blame]28
Paul Mundt332fd572007-11-22 17:30:50 +0900[diff] [blame]29#endif
30
Paul Mundte7ab3cd2008-09-21 19:04:55 +0900[diff] [blame]31struct user_regset;
32
Paul Mundt74d99a52007-11-26 20:38:36 +0900[diff] [blame]33extern int do_fpu_inst(unsigned short, struct pt_regs *);
34
Paul Mundte7ab3cd2008-09-21 19:04:55 +0900[diff] [blame]35extern int fpregs_get(struct task_struct *target,
36 const struct user_regset *regset,
37 unsigned int pos, unsigned int count,
38 void *kbuf, void __user *ubuf);
39
Stuart Menefyd3ea9fa2009-09-25 18:25:10 +0100[diff] [blame^]40static inline void __unlazy_fpu(struct task_struct *tsk, struct pt_regs *regs)
41{
42 if (task_thread_info(tsk)->status & TS_USEDFPU) {
43 task_thread_info(tsk)->status &= ~TS_USEDFPU;
44 save_fpu(tsk);
45 release_fpu(regs);
46 } else
47 tsk->fpu_counter = 0;
48}
49
Paul Mundt9bbafce2008-03-26 19:02:47 +0900[diff] [blame]50static inline void unlazy_fpu(struct task_struct *tsk, struct pt_regs *regs)
51{
52 preempt_disable();
Stuart Menefyd3ea9fa2009-09-25 18:25:10 +0100[diff] [blame^]53 __unlazy_fpu(tsk, regs);
Paul Mundt9bbafce2008-03-26 19:02:47 +0900[diff] [blame]54 preempt_enable();
55}
Paul Mundt332fd572007-11-22 17:30:50 +0900[diff] [blame]56
Paul Mundt9bbafce2008-03-26 19:02:47 +0900[diff] [blame]57static inline void clear_fpu(struct task_struct *tsk, struct pt_regs *regs)
58{
59 preempt_disable();
Stuart Menefyd3ea9fa2009-09-25 18:25:10 +0100[diff] [blame^]60 if (task_thread_info(tsk)->status & TS_USEDFPU) {
61 task_thread_info(tsk)->status &= ~TS_USEDFPU;
Paul Mundt9bbafce2008-03-26 19:02:47 +0900[diff] [blame]62 release_fpu(regs);
63 }
64 preempt_enable();
65}
Paul Mundt332fd572007-11-22 17:30:50 +0900[diff] [blame]66
Paul Mundte7ab3cd2008-09-21 19:04:55 +0900[diff] [blame]67static inline int init_fpu(struct task_struct *tsk)
68{
69 if (tsk_used_math(tsk)) {
70 if ((boot_cpu_data.flags & CPU_HAS_FPU) && tsk == current)
71 unlazy_fpu(tsk, task_pt_regs(tsk));
72 return 0;
73 }
74
75 set_stopped_child_used_math(tsk);
76 return 0;
77}
78
Paul Mundt332fd572007-11-22 17:30:50 +0900[diff] [blame]79#endif /* __ASSEMBLY__ */
80
81#endif /* __ASM_SH_FPU_H */