LXR linux/arch/powerpc/include/asm/switch

   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#else
  75static inline void enable_kernel_vsx(void)
  76{
  77        BUILD_BUG();
  78}
  79
  80static inline void disable_kernel_vsx(void)
  81{
  82        BUILD_BUG();
  83}
  84#endif
  85
  86#ifdef CONFIG_SPE
  87extern void enable_kernel_spe(void);
  88extern void flush_spe_to_thread(struct task_struct *);
  89extern void giveup_spe(struct task_struct *);
  90extern void __giveup_spe(struct task_struct *);
  91static inline void disable_kernel_spe(void)
  92{
  93        msr_check_and_clear(MSR_SPE);
  94}
  95#else
  96static inline void __giveup_spe(struct task_struct *t) { }
  97#endif
  98
  99static inline void clear_task_ebb(struct task_struct *t)
 100{
 101#ifdef CONFIG_PPC_BOOK3S_64
 102    /* EBB perf events are not inherited, so clear all EBB state. */
 103    t->thread.ebbrr = 0;
 104    t->thread.ebbhr = 0;
 105    t->thread.bescr = 0;
 106    t->thread.mmcr2 = 0;
 107    t->thread.mmcr0 = 0;
 108    t->thread.siar = 0;
 109    t->thread.sdar = 0;
 110    t->thread.sier = 0;
 111    t->thread.used_ebb = 0;
 112#endif
 113}
 114
 115extern int set_thread_tidr(struct task_struct *t);
 116
 117#endif /* _ASM_POWERPC_SWITCH_TO_H */
 118