1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu>
4  */
5 #ifndef _ASM_POWERPC_SWITCH_TO_H
6 #define _ASM_POWERPC_SWITCH_TO_H
7 
8 #include <asm/reg.h>
9 
10 struct thread_struct;
11 struct task_struct;
12 struct pt_regs;
13 
14 extern struct task_struct *__switch_to(struct task_struct *,
15 	struct task_struct *);
16 #define switch_to(prev, next, last)	((last) = __switch_to((prev), (next)))
17 
18 extern struct task_struct *_switch(struct thread_struct *prev,
19 				   struct thread_struct *next);
20 
21 extern void switch_booke_debug_regs(struct debug_reg *new_debug);
22 
23 extern int emulate_altivec(struct pt_regs *);
24 
25 extern void flush_all_to_thread(struct task_struct *);
26 extern void giveup_all(struct task_struct *);
27 
28 #ifdef CONFIG_PPC_FPU
29 extern void enable_kernel_fp(void);
30 extern void flush_fp_to_thread(struct task_struct *);
31 extern void giveup_fpu(struct task_struct *);
32 extern void save_fpu(struct task_struct *);
33 static inline void disable_kernel_fp(void)
34 {
35 	msr_check_and_clear(MSR_FP);
36 }
37 #else
38 static inline void save_fpu(struct task_struct *t) { }
39 static inline void flush_fp_to_thread(struct task_struct *t) { }
40 #endif
41 
42 #ifdef CONFIG_ALTIVEC
43 extern void enable_kernel_altivec(void);
44 extern void flush_altivec_to_thread(struct task_struct *);
45 extern void giveup_altivec(struct task_struct *);
46 extern void save_altivec(struct task_struct *);
47 static inline void disable_kernel_altivec(void)
48 {
49 	msr_check_and_clear(MSR_VEC);
50 }
51 #else
52 static inline void save_altivec(struct task_struct *t) { }
53 static inline void __giveup_altivec(struct task_struct *t) { }
54 #endif
55 
56 #ifdef CONFIG_VSX
57 extern void enable_kernel_vsx(void);
58 extern void flush_vsx_to_thread(struct task_struct *);
59 static 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
66 extern void enable_kernel_spe(void);
67 extern void flush_spe_to_thread(struct task_struct *);
68 extern void giveup_spe(struct task_struct *);
69 extern void __giveup_spe(struct task_struct *);
70 static inline void disable_kernel_spe(void)
71 {
72 	msr_check_and_clear(MSR_SPE);
73 }
74 #else
75 static inline void __giveup_spe(struct task_struct *t) { }
76 #endif
77 
78 static 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 extern int set_thread_uses_vas(void);
95 
96 extern int set_thread_tidr(struct task_struct *t);
97 
98 #endif /* _ASM_POWERPC_SWITCH_TO_H */
99