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 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 *);
38 
39 #ifndef CONFIG_SMP
40 extern void discard_lazy_cpu_state(void);
41 #else
42 static inline void discard_lazy_cpu_state(void)
43 {
44 }
45 #endif
46 
47 #ifdef CONFIG_PPC_FPU
48 extern void flush_fp_to_thread(struct task_struct *);
49 extern void giveup_fpu(struct task_struct *);
50 #else
51 static inline void flush_fp_to_thread(struct task_struct *t) { }
52 static inline void giveup_fpu(struct task_struct *t) { }
53 #endif
54 
55 #ifdef CONFIG_ALTIVEC
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);
59 #else
60 static inline void flush_altivec_to_thread(struct task_struct *t)
61 {
62 }
63 static inline void giveup_altivec(struct task_struct *t)
64 {
65 }
66 #endif
67 
68 #ifdef CONFIG_VSX
69 extern void flush_vsx_to_thread(struct task_struct *);
70 #else
71 static inline void flush_vsx_to_thread(struct task_struct *t)
72 {
73 }
74 #endif
75 
76 #ifdef CONFIG_SPE
77 extern void flush_spe_to_thread(struct task_struct *);
78 #else
79 static inline void flush_spe_to_thread(struct task_struct *t)
80 {
81 }
82 #endif
83 
84 static inline void clear_task_ebb(struct task_struct *t)
85 {
86 #ifdef CONFIG_PPC_BOOK3S_64
87     /* EBB perf events are not inherited, so clear all EBB state. */
88     t->thread.bescr = 0;
89     t->thread.mmcr2 = 0;
90     t->thread.mmcr0 = 0;
91     t->thread.siar = 0;
92     t->thread.sdar = 0;
93     t->thread.sier = 0;
94     t->thread.used_ebb = 0;
95 #endif
96 }
97 
98 #endif /* _ASM_POWERPC_SWITCH_TO_H */
99