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 void fpu_state_restore(struct pt_regs *regs); 23 #else 24 25 #define release_fpu(regs) do { } while (0) 26 #define grab_fpu(regs) do { } while (0) 27 28 static inline void save_fpu(struct task_struct *tsk, struct pt_regs *regs) 29 { 30 clear_tsk_thread_flag(tsk, TIF_USEDFPU); 31 } 32 #endif 33 34 struct user_regset; 35 36 extern int do_fpu_inst(unsigned short, struct pt_regs *); 37 38 extern int fpregs_get(struct task_struct *target, 39 const struct user_regset *regset, 40 unsigned int pos, unsigned int count, 41 void *kbuf, void __user *ubuf); 42 43 static inline void unlazy_fpu(struct task_struct *tsk, struct pt_regs *regs) 44 { 45 preempt_disable(); 46 if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) 47 save_fpu(tsk, regs); 48 else 49 tsk->fpu_counter = 0; 50 preempt_enable(); 51 } 52 53 static inline void clear_fpu(struct task_struct *tsk, struct pt_regs *regs) 54 { 55 preempt_disable(); 56 if (test_tsk_thread_flag(tsk, TIF_USEDFPU)) { 57 clear_tsk_thread_flag(tsk, TIF_USEDFPU); 58 release_fpu(regs); 59 } 60 preempt_enable(); 61 } 62 63 static inline int init_fpu(struct task_struct *tsk) 64 { 65 if (tsk_used_math(tsk)) { 66 if ((boot_cpu_data.flags & CPU_HAS_FPU) && tsk == current) 67 unlazy_fpu(tsk, task_pt_regs(tsk)); 68 return 0; 69 } 70 71 set_stopped_child_used_math(tsk); 72 return 0; 73 } 74 75 #endif /* __ASSEMBLY__ */ 76 77 #endif /* __ASM_SH_FPU_H */ 78