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_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
27 static 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 void enable_kernel_vsx(void);
33 extern int emulate_altivec(struct pt_regs *);
34 extern void __giveup_vsx(struct task_struct *);
35 extern void giveup_vsx(struct task_struct *);
36 extern void enable_kernel_spe(void);
37 extern void giveup_spe(struct task_struct *);
38 extern void load_up_spe(struct task_struct *);
39 extern void switch_booke_debug_regs(struct debug_reg *new_debug);
40 
41 #ifndef CONFIG_SMP
42 extern void discard_lazy_cpu_state(void);
43 #else
44 static inline void discard_lazy_cpu_state(void)
45 {
46 }
47 #endif
48 
49 #ifdef CONFIG_PPC_FPU
50 extern void flush_fp_to_thread(struct task_struct *);
51 extern void giveup_fpu(struct task_struct *);
52 #else
53 static inline void flush_fp_to_thread(struct task_struct *t) { }
54 static inline void giveup_fpu(struct task_struct *t) { }
55 #endif
56 
57 #ifdef CONFIG_ALTIVEC
58 extern void flush_altivec_to_thread(struct task_struct *);
59 extern void giveup_altivec(struct task_struct *);
60 extern void giveup_altivec_notask(void);
61 #else
62 static inline void flush_altivec_to_thread(struct task_struct *t)
63 {
64 }
65 static inline void giveup_altivec(struct task_struct *t)
66 {
67 }
68 #endif
69 
70 #ifdef CONFIG_VSX
71 extern void flush_vsx_to_thread(struct task_struct *);
72 #else
73 static inline void flush_vsx_to_thread(struct task_struct *t)
74 {
75 }
76 #endif
77 
78 #ifdef CONFIG_SPE
79 extern void flush_spe_to_thread(struct task_struct *);
80 #else
81 static inline void flush_spe_to_thread(struct task_struct *t)
82 {
83 }
84 #endif
85 
86 static 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