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

   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_early_sprs(struct thread_struct *prev)
  20{
  21        if (cpu_has_feature(CPU_FTR_ARCH_207S))
  22                prev->tar = mfspr(SPRN_TAR);
  23        if (cpu_has_feature(CPU_FTR_DSCR))
  24                prev->dscr = mfspr(SPRN_DSCR);
  25}
  26#else
  27static inline void save_early_sprs(struct thread_struct *prev) {}
  28#endif
  29
  30extern void enable_kernel_fp(void);
  31extern void enable_kernel_altivec(void);
  32extern void enable_kernel_vsx(void);
  33extern int emulate_altivec(struct pt_regs *);
  34extern void __giveup_vsx(struct task_struct *);
  35extern void giveup_vsx(struct task_struct *);
  36extern void enable_kernel_spe(void);
  37extern void giveup_spe(struct task_struct *);
  38extern void load_up_spe(struct task_struct *);
  39extern void switch_booke_debug_regs(struct debug_reg *new_debug);
  40
  41#ifndef CONFIG_SMP
  42extern void discard_lazy_cpu_state(void);
  43#else
  44static inline void discard_lazy_cpu_state(void)
  45{
  46}
  47#endif
  48
  49#ifdef CONFIG_PPC_FPU
  50extern void flush_fp_to_thread(struct task_struct *);
  51extern void giveup_fpu(struct task_struct *);
  52#else
  53static inline void flush_fp_to_thread(struct task_struct *t) { }
  54static inline void giveup_fpu(struct task_struct *t) { }
  55#endif
  56
  57#ifdef CONFIG_ALTIVEC
  58extern void flush_altivec_to_thread(struct task_struct *);
  59extern void giveup_altivec(struct task_struct *);
  60extern void giveup_altivec_notask(void);
  61#else
  62static inline void flush_altivec_to_thread(struct task_struct *t)
  63{
  64}
  65static inline void giveup_altivec(struct task_struct *t)
  66{
  67}
  68#endif
  69
  70#ifdef CONFIG_VSX
  71extern void flush_vsx_to_thread(struct task_struct *);
  72#else
  73static inline void flush_vsx_to_thread(struct task_struct *t)
  74{
  75}
  76#endif
  77
  78#ifdef CONFIG_SPE
  79extern void flush_spe_to_thread(struct task_struct *);
  80#else
  81static inline void flush_spe_to_thread(struct task_struct *t)
  82{
  83}
  84#endif
  85
  86static inline void clear_task_ebb(struct task_struct *t)
  87{
  88#ifdef CONFIG_PPC_BOOK3S_64
  89    /* EBB perf events are not inherited, so clear all EBB state. */
  90    t->thread.ebbrr = 0;
  91    t->thread.ebbhr = 0;
  92    t->thread.bescr = 0;
  93    t->thread.mmcr2 = 0;
  94    t->thread.mmcr0 = 0;
  95    t->thread.siar = 0;
  96    t->thread.sdar = 0;
  97    t->thread.sier = 0;
  98    t->thread.used_ebb = 0;
  99#endif
 100}
 101
 102#endif /* _ASM_POWERPC_SWITCH_TO_H */
 103