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) { }
 51static inline void enable_kernel_fp(void)
 52{
 53	BUILD_BUG();
 54}
 55#endif
 56
 57#ifdef CONFIG_ALTIVEC
 58extern void enable_kernel_altivec(void);
 59extern void flush_altivec_to_thread(struct task_struct *);
 60extern void giveup_altivec(struct task_struct *);
 61extern void save_altivec(struct task_struct *);
 62static inline void disable_kernel_altivec(void)
 63{
 64	msr_check_and_clear(MSR_VEC);
 65}
 66#else
 67static inline void save_altivec(struct task_struct *t) { }
 68static inline void __giveup_altivec(struct task_struct *t) { }
 69static inline void enable_kernel_altivec(void)
 70{
 71	BUILD_BUG();
 72}
 73
 74static inline void disable_kernel_altivec(void)
 75{
 76	BUILD_BUG();
 77}
 78#endif
 79
 80#ifdef CONFIG_VSX
 81extern void enable_kernel_vsx(void);
 82extern void flush_vsx_to_thread(struct task_struct *);
 83static inline void disable_kernel_vsx(void)
 84{
 85	msr_check_and_clear(MSR_FP|MSR_VEC|MSR_VSX);
 86}
 87#else
 88static inline void enable_kernel_vsx(void)
 89{
 90	BUILD_BUG();
 91}
 92
 93static inline void disable_kernel_vsx(void)
 94{
 95	BUILD_BUG();
 96}
 97#endif
 98
 99#ifdef CONFIG_SPE
100extern void enable_kernel_spe(void);
101extern void flush_spe_to_thread(struct task_struct *);
102extern void giveup_spe(struct task_struct *);
103extern void __giveup_spe(struct task_struct *);
104static inline void disable_kernel_spe(void)
105{
106	msr_check_and_clear(MSR_SPE);
107}
108#else
109static inline void __giveup_spe(struct task_struct *t) { }
110#endif
111
112static inline void clear_task_ebb(struct task_struct *t)
113{
114#ifdef CONFIG_PPC_BOOK3S_64
115    /* EBB perf events are not inherited, so clear all EBB state. */
116    t->thread.ebbrr = 0;
117    t->thread.ebbhr = 0;
118    t->thread.bescr = 0;
119    t->thread.mmcr2 = 0;
120    t->thread.mmcr0 = 0;
121    t->thread.siar = 0;
122    t->thread.sdar = 0;
123    t->thread.sier = 0;
124    t->thread.used_ebb = 0;
125#endif
126}
127
128void kvmppc_save_user_regs(void);
129void kvmppc_save_current_sprs(void);
130
131extern int set_thread_tidr(struct task_struct *t);
132
133#endif /* _ASM_POWERPC_SWITCH_TO_H */

 
 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 */