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review.evervolv.com / android_kernel_htc_msm8960 / ef3b7d0d3ed6c53917367003af90a4002f409d3d / . / arch / sh / include / asm / fpu.h
blob: fb6bbb9b1cc8e704191f5a6fb73ce001d3c9644f [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 Mundt6ba65382009-11-25 12:07:31 +0900[diff] [blame]28#define fpu_state_restore(regs) do { } while (0)
Paul Mundt138bed12008-03-26 19:09:21 +0900[diff] [blame]29
Paul Mundt332fd572007-11-22 17:30:50 +0900[diff] [blame]30#endif
31
Paul Mundte7ab3cd2008-09-21 19:04:55 +0900[diff] [blame]32struct user_regset;
33
Paul Mundt74d99a52007-11-26 20:38:36 +0900[diff] [blame]34extern int do_fpu_inst(unsigned short, struct pt_regs *);
35
Paul Mundte7ab3cd2008-09-21 19:04:55 +0900[diff] [blame]36extern int fpregs_get(struct task_struct *target,
37 const struct user_regset *regset,
38 unsigned int pos, unsigned int count,
39 void *kbuf, void __user *ubuf);
40
Stuart Menefyd3ea9fa2009-09-25 18:25:10 +0100[diff] [blame]41static inline void __unlazy_fpu(struct task_struct *tsk, struct pt_regs *regs)
42{
43 if (task_thread_info(tsk)->status & TS_USEDFPU) {
44 task_thread_info(tsk)->status &= ~TS_USEDFPU;
45 save_fpu(tsk);
46 release_fpu(regs);
47 } else
48 tsk->fpu_counter = 0;
49}
50
Paul Mundt9bbafce2008-03-26 19:02:47 +0900[diff] [blame]51static inline void unlazy_fpu(struct task_struct *tsk, struct pt_regs *regs)
52{
53 preempt_disable();
Stuart Menefyd3ea9fa2009-09-25 18:25:10 +0100[diff] [blame]54 __unlazy_fpu(tsk, regs);
Paul Mundt9bbafce2008-03-26 19:02:47 +0900[diff] [blame]55 preempt_enable();
56}
Paul Mundt332fd572007-11-22 17:30:50 +0900[diff] [blame]57
Paul Mundt9bbafce2008-03-26 19:02:47 +0900[diff] [blame]58static inline void clear_fpu(struct task_struct *tsk, struct pt_regs *regs)
59{
60 preempt_disable();
Stuart Menefyd3ea9fa2009-09-25 18:25:10 +0100[diff] [blame]61 if (task_thread_info(tsk)->status & TS_USEDFPU) {
62 task_thread_info(tsk)->status &= ~TS_USEDFPU;
Paul Mundt9bbafce2008-03-26 19:02:47 +0900[diff] [blame]63 release_fpu(regs);
64 }
65 preempt_enable();
66}
Paul Mundt332fd572007-11-22 17:30:50 +0900[diff] [blame]67
Paul Mundte7ab3cd2008-09-21 19:04:55 +0900[diff] [blame]68static inline int init_fpu(struct task_struct *tsk)
69{
70 if (tsk_used_math(tsk)) {
71 if ((boot_cpu_data.flags & CPU_HAS_FPU) && tsk == current)
72 unlazy_fpu(tsk, task_pt_regs(tsk));
73 return 0;
74 }
75
76 set_stopped_child_used_math(tsk);
77 return 0;
78}
79
Paul Mundt332fd572007-11-22 17:30:50 +0900[diff] [blame]80#endif /* __ASSEMBLY__ */
81
82#endif /* __ASM_SH_FPU_H */