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