tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
7struct thread_struct;
8struct task_struct;
9struct pt_regs;
10
11extern struct task_struct *__switch_to(struct task_struct *,
12 struct task_struct *);
13#define switch_to(prev, next, last) ((last) = __switch_to((prev), (next)))
14
15struct thread_struct;
16extern struct task_struct *_switch(struct thread_struct *prev,
17 struct thread_struct *next);
18#ifdef CONFIG_PPC_BOOK3S_64
19static inline void save_tar(struct thread_struct *prev)
20{
21 if (cpu_has_feature(CPU_FTR_ARCH_207S))
22 prev->tar = mfspr(SPRN_TAR);
23}
24#else
25static inline void save_tar(struct thread_struct *prev) {}
26#endif
27
28extern void enable_kernel_fp(void);
29extern void enable_kernel_altivec(void);
30extern int emulate_altivec(struct pt_regs *);
31extern void __giveup_vsx(struct task_struct *);
32extern void giveup_vsx(struct task_struct *);
33extern void enable_kernel_spe(void);
34extern void giveup_spe(struct task_struct *);
35extern void load_up_spe(struct task_struct *);
36extern void switch_booke_debug_regs(struct debug_reg *new_debug);
37
38#ifndef CONFIG_SMP
39extern void discard_lazy_cpu_state(void);
40#else
41static inline void discard_lazy_cpu_state(void)
42{
43}
44#endif
45
46#ifdef CONFIG_PPC_FPU
47extern void flush_fp_to_thread(struct task_struct *);
48extern void giveup_fpu(struct task_struct *);
49#else
50static inline void flush_fp_to_thread(struct task_struct *t) { }
51static inline void giveup_fpu(struct task_struct *t) { }
52#endif
53
54#ifdef CONFIG_ALTIVEC
55extern void flush_altivec_to_thread(struct task_struct *);
56extern void giveup_altivec(struct task_struct *);
57extern void giveup_altivec_notask(void);
58#else
59static inline void flush_altivec_to_thread(struct task_struct *t)
60{
61}
62static inline void giveup_altivec(struct task_struct *t)
63{
64}
65#endif
66
67#ifdef CONFIG_VSX
68extern void flush_vsx_to_thread(struct task_struct *);
69#else
70static inline void flush_vsx_to_thread(struct task_struct *t)
71{
72}
73#endif
74
75#ifdef CONFIG_SPE
76extern void flush_spe_to_thread(struct task_struct *);
77#else
78static inline void flush_spe_to_thread(struct task_struct *t)
79{
80}
81#endif
82
83static inline void clear_task_ebb(struct task_struct *t)
84{
85#ifdef CONFIG_PPC_BOOK3S_64
86 /* EBB perf events are not inherited, so clear all EBB state. */
87 t->thread.bescr = 0;
88 t->thread.mmcr2 = 0;
89 t->thread.mmcr0 = 0;
90 t->thread.siar = 0;
91 t->thread.sdar = 0;
92 t->thread.sier = 0;
93 t->thread.used_ebb = 0;
94#endif
95}
96
97#endif /* _ASM_POWERPC_SWITCH_TO_H */