1 #ifndef __ASM_SH_FPU_H 2 #define __ASM_SH_FPU_H 3 4 #ifndef __ASSEMBLY__ 5 #include <linux/preempt.h> 6 #include <asm/ptrace.h> 7 8 #ifdef CONFIG_SH_FPU 9 static inline void release_fpu(struct pt_regs *regs) 10 { 11 regs->sr |= SR_FD; 12 } 13 14 static inline void grab_fpu(struct pt_regs *regs) 15 { 16 regs->sr &= ~SR_FD; 17 } 18 19 struct task_struct; 20 21 extern void save_fpu(struct task_struct *__tsk, struct pt_regs *regs); 22 #else 23 24 #define release_fpu(regs) do { } while (0) 25 #define grab_fpu(regs) do { } while (0) 26 27 static inline void save_fpu(struct task_struct *tsk, struct pt_regs *regs) 28 { 29 clear_tsk_thread_flag(tsk, TIF_USEDFPU); 30 } 31 #endif 32 33 struct user_regset; 34 35 extern int do_fpu_inst(unsigned short, struct pt_regs *); 36 37 extern int fpregs_get(struct task_struct *target, 38 const struct user_regset *regset, 39 unsigned int pos, unsigned int count, 40 void *kbuf, void __user *ubuf); 41 42 static inline void unlazy_fpu(struct task_struct *tsk, struct pt_regs *regs) 43 { 44 preempt_disable(); 45 if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) 46 save_fpu(tsk, regs); 47 preempt_enable(); 48 } 49 50 static inline void clear_fpu(struct task_struct *tsk, struct pt_regs *regs) 51 { 52 preempt_disable(); 53 if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) { 54 clear_tsk_thread_flag(tsk, TIF_USEDFPU); 55 release_fpu(regs); 56 } 57 preempt_enable(); 58 } 59 60 static inline int init_fpu(struct task_struct *tsk) 61 { 62 if (tsk_used_math(tsk)) { 63 if ((boot_cpu_data.flags & CPU_HAS_FPU) && tsk == current) 64 unlazy_fpu(tsk, task_pt_regs(tsk)); 65 return 0; 66 } 67 68 set_stopped_child_used_math(tsk); 69 return 0; 70 } 71 72 #endif /* __ASSEMBLY__ */ 73 74 #endif /* __ASM_SH_FPU_H */ 75