1/* 2 * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu> 3 */ 4#ifndef _ASM_POWERPC_SWITCH_TO_H 5#define _ASM_POWERPC_SWITCH_TO_H 6 7struct thread_struct; 8struct task_struct; 9struct pt_regs; 10 11extern struct task_struct *__switch_to(struct task_struct *, 12 struct task_struct *); 13#define switch_to(prev, next, last) ((last) = __switch_to((prev), (next))) 14 15struct thread_struct; 16extern struct task_struct *_switch(struct thread_struct *prev, 17 struct thread_struct *next); 18#ifdef CONFIG_PPC_BOOK3S_64 19static inline void save_early_sprs(struct thread_struct *prev) 20{ 21 if (cpu_has_feature(CPU_FTR_ARCH_207S)) 22 prev->tar = mfspr(SPRN_TAR); 23 if (cpu_has_feature(CPU_FTR_DSCR)) 24 prev->dscr = mfspr(SPRN_DSCR); 25} 26#else 27static inline void save_early_sprs(struct thread_struct *prev) {} 28#endif 29 30extern void enable_kernel_fp(void); 31extern void enable_kernel_altivec(void); 32extern void enable_kernel_vsx(void); 33extern int emulate_altivec(struct pt_regs *); 34extern void __giveup_vsx(struct task_struct *); 35extern void giveup_vsx(struct task_struct *); 36extern void enable_kernel_spe(void); 37extern void giveup_spe(struct task_struct *); 38extern void load_up_spe(struct task_struct *); 39extern void switch_booke_debug_regs(struct debug_reg *new_debug); 40 41#ifndef CONFIG_SMP 42extern void discard_lazy_cpu_state(void); 43#else 44static inline void discard_lazy_cpu_state(void) 45{ 46} 47#endif 48 49#ifdef CONFIG_PPC_FPU 50extern void flush_fp_to_thread(struct task_struct *); 51extern void giveup_fpu(struct task_struct *); 52#else 53static inline void flush_fp_to_thread(struct task_struct *t) { } 54static inline void giveup_fpu(struct task_struct *t) { } 55#endif 56 57#ifdef CONFIG_ALTIVEC 58extern void flush_altivec_to_thread(struct task_struct *); 59extern void giveup_altivec(struct task_struct *); 60extern void giveup_altivec_notask(void); 61#else 62static inline void flush_altivec_to_thread(struct task_struct *t) 63{ 64} 65static inline void giveup_altivec(struct task_struct *t) 66{ 67} 68#endif 69 70#ifdef CONFIG_VSX 71extern void flush_vsx_to_thread(struct task_struct *); 72#else 73static inline void flush_vsx_to_thread(struct task_struct *t) 74{ 75} 76#endif 77 78#ifdef CONFIG_SPE 79extern void flush_spe_to_thread(struct task_struct *); 80#else 81static inline void flush_spe_to_thread(struct task_struct *t) 82{ 83} 84#endif 85 86static inline void clear_task_ebb(struct task_struct *t) 87{ 88#ifdef CONFIG_PPC_BOOK3S_64 89 /* EBB perf events are not inherited, so clear all EBB state. */ 90 t->thread.ebbrr = 0; 91 t->thread.ebbhr = 0; 92 t->thread.bescr = 0; 93 t->thread.mmcr2 = 0; 94 t->thread.mmcr0 = 0; 95 t->thread.siar = 0; 96 t->thread.sdar = 0; 97 t->thread.sier = 0; 98 t->thread.used_ebb = 0; 99#endif 100} 101 102#endif /* _ASM_POWERPC_SWITCH_TO_H */ 103