1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu>
5 #ifndef _ASM_POWERPC_SWITCH_TO_H
6 #define _ASM_POWERPC_SWITCH_TO_H
8 #include <linux/sched.h>
15 extern struct task_struct *__switch_to(struct task_struct *,
16 struct task_struct *);
17 #define switch_to(prev, next, last) ((last) = __switch_to((prev), (next)))
19 extern struct task_struct *_switch(struct thread_struct *prev,
20 struct thread_struct *next);
22 extern void switch_booke_debug_regs(struct debug_reg *new_debug);
24 extern int emulate_altivec(struct pt_regs *);
26 #ifdef CONFIG_PPC_BOOK3S_64
27 void restore_math(struct pt_regs *regs);
29 static inline void restore_math(struct pt_regs *regs)
34 void restore_tm_state(struct pt_regs *regs);
36 extern void flush_all_to_thread(struct task_struct *);
37 extern void giveup_all(struct task_struct *);
40 extern void enable_kernel_fp(void);
41 extern void flush_fp_to_thread(struct task_struct *);
42 extern void giveup_fpu(struct task_struct *);
43 extern void save_fpu(struct task_struct *);
44 static inline void disable_kernel_fp(void)
46 msr_check_and_clear(MSR_FP);
49 static inline void save_fpu(struct task_struct *t) { }
50 static inline void flush_fp_to_thread(struct task_struct *t) { }
54 extern void enable_kernel_altivec(void);
55 extern void flush_altivec_to_thread(struct task_struct *);
56 extern void giveup_altivec(struct task_struct *);
57 extern void save_altivec(struct task_struct *);
58 static inline void disable_kernel_altivec(void)
60 msr_check_and_clear(MSR_VEC);
63 static inline void save_altivec(struct task_struct *t) { }
64 static inline void __giveup_altivec(struct task_struct *t) { }
68 extern void enable_kernel_vsx(void);
69 extern void flush_vsx_to_thread(struct task_struct *);
70 static inline void disable_kernel_vsx(void)
72 msr_check_and_clear(MSR_FP|MSR_VEC|MSR_VSX);
75 static inline void enable_kernel_vsx(void)
80 static inline void disable_kernel_vsx(void)
87 extern void enable_kernel_spe(void);
88 extern void flush_spe_to_thread(struct task_struct *);
89 extern void giveup_spe(struct task_struct *);
90 extern void __giveup_spe(struct task_struct *);
91 static inline void disable_kernel_spe(void)
93 msr_check_and_clear(MSR_SPE);
96 static inline void __giveup_spe(struct task_struct *t) { }
99 static inline void clear_task_ebb(struct task_struct *t)
101 #ifdef CONFIG_PPC_BOOK3S_64
102 /* EBB perf events are not inherited, so clear all EBB state. */
111 t->thread.used_ebb = 0;
115 extern int set_thread_tidr(struct task_struct *t);
117 #endif /* _ASM_POWERPC_SWITCH_TO_H */