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
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)))
18 extern struct task_struct *_switch(struct thread_struct *prev,
19 struct thread_struct *next);
21 extern void switch_booke_debug_regs(struct debug_reg *new_debug);
23 extern int emulate_altivec(struct pt_regs *);
25 extern void flush_all_to_thread(struct task_struct *);
26 extern void giveup_all(struct task_struct *);
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)
35 msr_check_and_clear(MSR_FP);
38 static inline void save_fpu(struct task_struct *t) { }
39 static inline void flush_fp_to_thread(struct task_struct *t) { }
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)
49 msr_check_and_clear(MSR_VEC);
52 static inline void save_altivec(struct task_struct *t) { }
53 static inline void __giveup_altivec(struct task_struct *t) { }
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)
61 msr_check_and_clear(MSR_FP|MSR_VEC|MSR_VSX);
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)
72 msr_check_and_clear(MSR_SPE);
75 static inline void __giveup_spe(struct task_struct *t) { }
78 static inline void clear_task_ebb(struct task_struct *t)
80 #ifdef CONFIG_PPC_BOOK3S_64
81 /* EBB perf events are not inherited, so clear all EBB state. */
90 t->thread.used_ebb = 0;
94 extern int set_thread_uses_vas(void);
96 extern int set_thread_tidr(struct task_struct *t);
98 #endif /* _ASM_POWERPC_SWITCH_TO_H */