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
7struct thread_struct;
8struct task_struct;
9struct pt_regs;
10
11extern 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
15struct thread_struct;
16extern struct task_struct *_switch(struct thread_struct *prev,
17				   struct thread_struct *next);
18#ifdef CONFIG_PPC_BOOK3S_64
19static 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
27static inline void save_early_sprs(struct thread_struct *prev) {}
28#endif
29
30extern void enable_kernel_fp(void);
31extern void enable_kernel_altivec(void);
32extern void enable_kernel_vsx(void);
33extern int emulate_altivec(struct pt_regs *);
34extern void __giveup_vsx(struct task_struct *);
35extern void giveup_vsx(struct task_struct *);
36extern void enable_kernel_spe(void);
37extern void giveup_spe(struct task_struct *);
38extern void load_up_spe(struct task_struct *);
39extern void switch_booke_debug_regs(struct debug_reg *new_debug);
40
41#ifndef CONFIG_SMP
42extern void discard_lazy_cpu_state(void);
43#else
44static inline void discard_lazy_cpu_state(void)
45{
46}
47#endif
48
49#ifdef CONFIG_PPC_FPU
50extern void flush_fp_to_thread(struct task_struct *);
51extern void giveup_fpu(struct task_struct *);
52#else
53static inline void flush_fp_to_thread(struct task_struct *t) { }
54static inline void giveup_fpu(struct task_struct *t) { }
55#endif
56
57#ifdef CONFIG_ALTIVEC
58extern void flush_altivec_to_thread(struct task_struct *);
59extern void giveup_altivec(struct task_struct *);
60extern void giveup_altivec_notask(void);
61#else
62static inline void flush_altivec_to_thread(struct task_struct *t)
63{
64}
65static inline void giveup_altivec(struct task_struct *t)
66{
67}
68#endif
69
70#ifdef CONFIG_VSX
71extern void flush_vsx_to_thread(struct task_struct *);
72#else
73static inline void flush_vsx_to_thread(struct task_struct *t)
74{
75}
76#endif
77
78#ifdef CONFIG_SPE
79extern void flush_spe_to_thread(struct task_struct *);
80#else
81static inline void flush_spe_to_thread(struct task_struct *t)
82{
83}
84#endif
85
86static 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