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Linux kernel mirror (for testing)
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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 <linux/sched.h>
9#include <asm/reg.h>
10
11struct thread_struct;
12struct task_struct;
13struct pt_regs;
14
15extern struct task_struct *__switch_to(struct task_struct *,
16 struct task_struct *);
17#define switch_to(prev, next, last) ((last) = __switch_to((prev), (next)))
18
19extern struct task_struct *_switch(struct thread_struct *prev,
20 struct thread_struct *next);
21
22extern void switch_booke_debug_regs(struct debug_reg *new_debug);
23
24extern int emulate_altivec(struct pt_regs *);
25
26#ifdef CONFIG_PPC_BOOK3S_64
27void restore_math(struct pt_regs *regs);
28#else
29static inline void restore_math(struct pt_regs *regs)
30{
31}
32#endif
33
34void restore_tm_state(struct pt_regs *regs);
35
36extern void flush_all_to_thread(struct task_struct *);
37extern void giveup_all(struct task_struct *);
38
39#ifdef CONFIG_PPC_FPU
40extern void enable_kernel_fp(void);
41extern void flush_fp_to_thread(struct task_struct *);
42extern void giveup_fpu(struct task_struct *);
43extern void save_fpu(struct task_struct *);
44static inline void disable_kernel_fp(void)
45{
46 msr_check_and_clear(MSR_FP);
47}
48#else
49static inline void save_fpu(struct task_struct *t) { }
50static inline void flush_fp_to_thread(struct task_struct *t) { }
51#endif
52
53#ifdef CONFIG_ALTIVEC
54extern void enable_kernel_altivec(void);
55extern void flush_altivec_to_thread(struct task_struct *);
56extern void giveup_altivec(struct task_struct *);
57extern void save_altivec(struct task_struct *);
58static inline void disable_kernel_altivec(void)
59{
60 msr_check_and_clear(MSR_VEC);
61}
62#else
63static inline void save_altivec(struct task_struct *t) { }
64static inline void __giveup_altivec(struct task_struct *t) { }
65#endif
66
67#ifdef CONFIG_VSX
68extern void enable_kernel_vsx(void);
69extern void flush_vsx_to_thread(struct task_struct *);
70static inline void disable_kernel_vsx(void)
71{
72 msr_check_and_clear(MSR_FP|MSR_VEC|MSR_VSX);
73}
74#endif
75
76#ifdef CONFIG_SPE
77extern void enable_kernel_spe(void);
78extern void flush_spe_to_thread(struct task_struct *);
79extern void giveup_spe(struct task_struct *);
80extern void __giveup_spe(struct task_struct *);
81static inline void disable_kernel_spe(void)
82{
83 msr_check_and_clear(MSR_SPE);
84}
85#else
86static inline void __giveup_spe(struct task_struct *t) { }
87#endif
88
89static inline void clear_task_ebb(struct task_struct *t)
90{
91#ifdef CONFIG_PPC_BOOK3S_64
92 /* EBB perf events are not inherited, so clear all EBB state. */
93 t->thread.ebbrr = 0;
94 t->thread.ebbhr = 0;
95 t->thread.bescr = 0;
96 t->thread.mmcr2 = 0;
97 t->thread.mmcr0 = 0;
98 t->thread.siar = 0;
99 t->thread.sdar = 0;
100 t->thread.sier = 0;
101 t->thread.used_ebb = 0;
102#endif
103}
104
105extern int set_thread_tidr(struct task_struct *t);
106
107#endif /* _ASM_POWERPC_SWITCH_TO_H */