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 7 struct thread_struct; 8 struct task_struct; 9 struct pt_regs; 10 11 extern 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 15 struct thread_struct; 16 extern struct task_struct *_switch(struct thread_struct *prev, 17 struct thread_struct *next); 18 #ifdef CONFIG_PPC_BOOK3S_64 save_early_sprs(struct thread_struct * prev)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 save_early_sprs(struct thread_struct * prev)27static inline void save_early_sprs(struct thread_struct *prev) {} 28 #endif 29 30 extern void enable_kernel_fp(void); 31 extern void enable_kernel_altivec(void); 32 extern int emulate_altivec(struct pt_regs *); 33 extern void __giveup_vsx(struct task_struct *); 34 extern void giveup_vsx(struct task_struct *); 35 extern void enable_kernel_spe(void); 36 extern void giveup_spe(struct task_struct *); 37 extern void load_up_spe(struct task_struct *); 38 extern void switch_booke_debug_regs(struct debug_reg *new_debug); 39 40 #ifndef CONFIG_SMP 41 extern void discard_lazy_cpu_state(void); 42 #else discard_lazy_cpu_state(void)43static inline void discard_lazy_cpu_state(void) 44 { 45 } 46 #endif 47 48 #ifdef CONFIG_PPC_FPU 49 extern void flush_fp_to_thread(struct task_struct *); 50 extern void giveup_fpu(struct task_struct *); 51 #else flush_fp_to_thread(struct task_struct * t)52static inline void flush_fp_to_thread(struct task_struct *t) { } giveup_fpu(struct task_struct * t)53static inline void giveup_fpu(struct task_struct *t) { } 54 #endif 55 56 #ifdef CONFIG_ALTIVEC 57 extern void flush_altivec_to_thread(struct task_struct *); 58 extern void giveup_altivec(struct task_struct *); 59 extern void giveup_altivec_notask(void); 60 #else flush_altivec_to_thread(struct task_struct * t)61static inline void flush_altivec_to_thread(struct task_struct *t) 62 { 63 } giveup_altivec(struct task_struct * t)64static inline void giveup_altivec(struct task_struct *t) 65 { 66 } 67 #endif 68 69 #ifdef CONFIG_VSX 70 extern void flush_vsx_to_thread(struct task_struct *); 71 #else flush_vsx_to_thread(struct task_struct * t)72static inline void flush_vsx_to_thread(struct task_struct *t) 73 { 74 } 75 #endif 76 77 #ifdef CONFIG_SPE 78 extern void flush_spe_to_thread(struct task_struct *); 79 #else flush_spe_to_thread(struct task_struct * t)80static inline void flush_spe_to_thread(struct task_struct *t) 81 { 82 } 83 #endif 84 clear_task_ebb(struct task_struct * t)85static inline void clear_task_ebb(struct task_struct *t) 86 { 87 #ifdef CONFIG_PPC_BOOK3S_64 88 /* EBB perf events are not inherited, so clear all EBB state. */ 89 t->thread.ebbrr = 0; 90 t->thread.ebbhr = 0; 91 t->thread.bescr = 0; 92 t->thread.mmcr2 = 0; 93 t->thread.mmcr0 = 0; 94 t->thread.siar = 0; 95 t->thread.sdar = 0; 96 t->thread.sier = 0; 97 t->thread.used_ebb = 0; 98 #endif 99 } 100 101 #endif /* _ASM_POWERPC_SWITCH_TO_H */ 102