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