1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __ASM_SH_FPU_H 3 #define __ASM_SH_FPU_H 4 5 #ifndef __ASSEMBLY__ 6 7 #include <asm/ptrace.h> 8 9 struct task_struct; 10 11 #ifdef CONFIG_SH_FPU 12 static inline void release_fpu(struct pt_regs *regs) 13 { 14 regs->sr |= SR_FD; 15 } 16 17 static inline void grab_fpu(struct pt_regs *regs) 18 { 19 regs->sr &= ~SR_FD; 20 } 21 22 extern void save_fpu(struct task_struct *__tsk); 23 extern void restore_fpu(struct task_struct *__tsk); 24 extern void fpu_state_restore(struct pt_regs *regs); 25 extern void __fpu_state_restore(void); 26 #else 27 #define save_fpu(tsk) do { } while (0) 28 #define restore_fpu(tsk) do { } while (0) 29 #define release_fpu(regs) do { } while (0) 30 #define grab_fpu(regs) do { } while (0) 31 #define fpu_state_restore(regs) do { } while (0) 32 #define __fpu_state_restore(regs) do { } while (0) 33 #endif 34 35 struct user_regset; 36 37 extern int do_fpu_inst(unsigned short, struct pt_regs *); 38 extern int init_fpu(struct task_struct *); 39 40 extern int fpregs_get(struct task_struct *target, 41 const struct user_regset *regset, 42 unsigned int pos, unsigned int count, 43 void *kbuf, void __user *ubuf); 44 45 static inline void __unlazy_fpu(struct task_struct *tsk, struct pt_regs *regs) 46 { 47 if (task_thread_info(tsk)->status & TS_USEDFPU) { 48 task_thread_info(tsk)->status &= ~TS_USEDFPU; 49 save_fpu(tsk); 50 release_fpu(regs); 51 } else 52 tsk->thread.fpu_counter = 0; 53 } 54 55 static inline void unlazy_fpu(struct task_struct *tsk, struct pt_regs *regs) 56 { 57 preempt_disable(); 58 __unlazy_fpu(tsk, regs); 59 preempt_enable(); 60 } 61 62 static inline void clear_fpu(struct task_struct *tsk, struct pt_regs *regs) 63 { 64 preempt_disable(); 65 if (task_thread_info(tsk)->status & TS_USEDFPU) { 66 task_thread_info(tsk)->status &= ~TS_USEDFPU; 67 release_fpu(regs); 68 } 69 preempt_enable(); 70 } 71 72 #endif /* __ASSEMBLY__ */ 73 74 #endif /* __ASM_SH_FPU_H */ 75