1 #ifndef __ASM_SH_FPU_H 2 #define __ASM_SH_FPU_H 3 4 #ifndef __ASSEMBLY__ 5 6 #include <asm/ptrace.h> 7 8 struct task_struct; 9 10 #ifdef CONFIG_SH_FPU 11 static inline void release_fpu(struct pt_regs *regs) 12 { 13 regs->sr |= SR_FD; 14 } 15 16 static inline void grab_fpu(struct pt_regs *regs) 17 { 18 regs->sr &= ~SR_FD; 19 } 20 21 extern void save_fpu(struct task_struct *__tsk); 22 extern void restore_fpu(struct task_struct *__tsk); 23 extern void fpu_state_restore(struct pt_regs *regs); 24 extern 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 34 struct user_regset; 35 36 extern int do_fpu_inst(unsigned short, struct pt_regs *); 37 extern int init_fpu(struct task_struct *); 38 39 extern 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 44 static 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 54 static 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 61 static 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 */ 74