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 19 static inline void save_tar(struct thread_struct *prev) 20 { 21 if (cpu_has_feature(CPU_FTR_ARCH_207S)) 22 prev->tar = mfspr(SPRN_TAR); 23 } 24 #else 25 static inline void save_tar(struct thread_struct *prev) {} 26 #endif 27 28 extern void giveup_fpu(struct task_struct *); 29 extern void load_up_fpu(void); 30 extern void disable_kernel_fp(void); 31 extern void enable_kernel_fp(void); 32 extern void flush_fp_to_thread(struct task_struct *); 33 extern void enable_kernel_altivec(void); 34 extern void load_up_altivec(struct task_struct *); 35 extern int emulate_altivec(struct pt_regs *); 36 extern void __giveup_vsx(struct task_struct *); 37 extern void giveup_vsx(struct task_struct *); 38 extern void enable_kernel_spe(void); 39 extern void giveup_spe(struct task_struct *); 40 extern void load_up_spe(struct task_struct *); 41 42 #ifndef CONFIG_SMP 43 extern void discard_lazy_cpu_state(void); 44 #else 45 static inline void discard_lazy_cpu_state(void) 46 { 47 } 48 #endif 49 50 #ifdef CONFIG_ALTIVEC 51 extern void flush_altivec_to_thread(struct task_struct *); 52 extern void giveup_altivec(struct task_struct *); 53 extern void giveup_altivec_notask(void); 54 #else 55 static inline void flush_altivec_to_thread(struct task_struct *t) 56 { 57 } 58 static inline void giveup_altivec(struct task_struct *t) 59 { 60 } 61 #endif 62 63 #ifdef CONFIG_VSX 64 extern void flush_vsx_to_thread(struct task_struct *); 65 #else 66 static inline void flush_vsx_to_thread(struct task_struct *t) 67 { 68 } 69 #endif 70 71 #ifdef CONFIG_SPE 72 extern void flush_spe_to_thread(struct task_struct *); 73 #else 74 static inline void flush_spe_to_thread(struct task_struct *t) 75 { 76 } 77 #endif 78 79 static inline void clear_task_ebb(struct task_struct *t) 80 { 81 #ifdef CONFIG_PPC_BOOK3S_64 82 /* EBB perf events are not inherited, so clear all EBB state. */ 83 t->thread.bescr = 0; 84 t->thread.mmcr2 = 0; 85 t->thread.mmcr0 = 0; 86 t->thread.siar = 0; 87 t->thread.sdar = 0; 88 t->thread.sier = 0; 89 t->thread.used_ebb = 0; 90 #endif 91 } 92 93 #endif /* _ASM_POWERPC_SWITCH_TO_H */ 94