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#include <asm/reg.h>
 8
 9struct thread_struct;
10struct task_struct;
11struct pt_regs;
12
13extern struct task_struct *__switch_to(struct task_struct *,
14	struct task_struct *);
15#define switch_to(prev, next, last)	((last) = __switch_to((prev), (next)))
16
17extern struct task_struct *_switch(struct thread_struct *prev,
18				   struct thread_struct *next);
19
20extern void switch_booke_debug_regs(struct debug_reg *new_debug);
21
22extern int emulate_altivec(struct pt_regs *);
23
24extern void flush_all_to_thread(struct task_struct *);
25extern void giveup_all(struct task_struct *);
26
27#ifdef CONFIG_PPC_FPU
28extern void enable_kernel_fp(void);
29extern void flush_fp_to_thread(struct task_struct *);
30extern void giveup_fpu(struct task_struct *);
31extern void save_fpu(struct task_struct *);
32static inline void disable_kernel_fp(void)
33{
34	msr_check_and_clear(MSR_FP);
35}
36#else
37static inline void __giveup_fpu(struct task_struct *t) { }
38static inline void save_fpu(struct task_struct *t) { }
39static inline void flush_fp_to_thread(struct task_struct *t) { }
40#endif
41
42#ifdef CONFIG_ALTIVEC
43extern void enable_kernel_altivec(void);
44extern void flush_altivec_to_thread(struct task_struct *);
45extern void giveup_altivec(struct task_struct *);
46extern void save_altivec(struct task_struct *);
47static inline void disable_kernel_altivec(void)
48{
49	msr_check_and_clear(MSR_VEC);
50}
51#else
52static inline void save_altivec(struct task_struct *t) { }
53static inline void __giveup_altivec(struct task_struct *t) { }
54#endif
55
56#ifdef CONFIG_VSX
57extern void enable_kernel_vsx(void);
58extern void flush_vsx_to_thread(struct task_struct *);
59static inline void disable_kernel_vsx(void)
60{
61	msr_check_and_clear(MSR_FP|MSR_VEC|MSR_VSX);
62}
63#endif
64
65#ifdef CONFIG_SPE
66extern void enable_kernel_spe(void);
67extern void flush_spe_to_thread(struct task_struct *);
68extern void giveup_spe(struct task_struct *);
69extern void __giveup_spe(struct task_struct *);
70static inline void disable_kernel_spe(void)
71{
72	msr_check_and_clear(MSR_SPE);
73}
74#else
75static inline void __giveup_spe(struct task_struct *t) { }
76#endif
77
78static inline void clear_task_ebb(struct task_struct *t)
79{
80#ifdef CONFIG_PPC_BOOK3S_64
81    /* EBB perf events are not inherited, so clear all EBB state. */
82    t->thread.ebbrr = 0;
83    t->thread.ebbhr = 0;
84    t->thread.bescr = 0;
85    t->thread.mmcr2 = 0;
86    t->thread.mmcr0 = 0;
87    t->thread.siar = 0;
88    t->thread.sdar = 0;
89    t->thread.sier = 0;
90    t->thread.used_ebb = 0;
91#endif
92}
93
94#endif /* _ASM_POWERPC_SWITCH_TO_H */