2 * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu>
4 #ifndef _ASM_POWERPC_SWITCH_TO_H
5 #define _ASM_POWERPC_SWITCH_TO_H
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)))
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)
21 if (cpu_has_feature(CPU_FTR_ARCH_207S))
22 prev->tar = mfspr(SPRN_TAR);
25 static inline void save_tar(struct thread_struct *prev) {}
28 extern void load_up_fpu(void);
29 extern void enable_kernel_fp(void);
30 extern void enable_kernel_altivec(void);
31 extern void load_up_altivec(struct task_struct *);
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 *);
40 extern void discard_lazy_cpu_state(void);
42 static inline void discard_lazy_cpu_state(void)
48 extern void flush_fp_to_thread(struct task_struct *);
49 extern void giveup_fpu(struct task_struct *);
51 static inline void flush_fp_to_thread(struct task_struct *t) { }
52 static inline void giveup_fpu(struct task_struct *t) { }
56 extern void flush_altivec_to_thread(struct task_struct *);
57 extern void giveup_altivec(struct task_struct *);
58 extern void giveup_altivec_notask(void);
60 static inline void flush_altivec_to_thread(struct task_struct *t)
63 static inline void giveup_altivec(struct task_struct *t)
69 extern void flush_vsx_to_thread(struct task_struct *);
71 static inline void flush_vsx_to_thread(struct task_struct *t)
77 extern void flush_spe_to_thread(struct task_struct *);
79 static inline void flush_spe_to_thread(struct task_struct *t)
84 static inline void clear_task_ebb(struct task_struct *t)
86 #ifdef CONFIG_PPC_BOOK3S_64
87 /* EBB perf events are not inherited, so clear all EBB state. */
94 t->thread.used_ebb = 0;
98 #endif /* _ASM_POWERPC_SWITCH_TO_H */