arch/powerpc/include/asm/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
   7 struct thread_struct;
   8 struct task_struct;
   9 struct pt_regs;
  10
  11 extern 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
  15 struct thread_struct;
  16 extern struct task_struct *_switch(struct thread_struct *prev,
  17                                    struct thread_struct *next);
  18 #ifdef CONFIG_PPC_BOOK3S_64
  19 static 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
  27 static inline void save_early_sprs(struct thread_struct *prev) {}
  28 #endif
  29
  30 extern void enable_kernel_fp(void);
  31 extern void enable_kernel_altivec(void);
  32 extern void enable_kernel_vsx(void);
  33 extern int emulate_altivec(struct pt_regs *);
  34 extern void __giveup_vsx(struct task_struct *);
  35 extern void giveup_vsx(struct task_struct *);
  36 extern void enable_kernel_spe(void);
  37 extern void giveup_spe(struct task_struct *);
  38 extern void load_up_spe(struct task_struct *);
  39 extern void switch_booke_debug_regs(struct debug_reg *new_debug);
  40
  41 #ifndef CONFIG_SMP
  42 extern void discard_lazy_cpu_state(void);
  43 #else
  44 static inline void discard_lazy_cpu_state(void)
  45 {
  46 }
  47 #endif
  48
  49 #ifdef CONFIG_PPC_FPU
  50 extern void flush_fp_to_thread(struct task_struct *);
  51 extern void giveup_fpu(struct task_struct *);
  52 #else
  53 static inline void flush_fp_to_thread(struct task_struct *t) { }
  54 static inline void giveup_fpu(struct task_struct *t) { }
  55 #endif
  56
  57 #ifdef CONFIG_ALTIVEC
  58 extern void flush_altivec_to_thread(struct task_struct *);
  59 extern void giveup_altivec(struct task_struct *);
  60 extern void giveup_altivec_notask(void);
  61 #else
  62 static inline void flush_altivec_to_thread(struct task_struct *t)
  63 {
  64 }
  65 static inline void giveup_altivec(struct task_struct *t)
  66 {
  67 }
  68 #endif
  69
  70 #ifdef CONFIG_VSX
  71 extern void flush_vsx_to_thread(struct task_struct *);
  72 #else
  73 static inline void flush_vsx_to_thread(struct task_struct *t)
  74 {
  75 }
  76 #endif
  77
  78 #ifdef CONFIG_SPE
  79 extern void flush_spe_to_thread(struct task_struct *);
  80 #else
  81 static inline void flush_spe_to_thread(struct task_struct *t)
  82 {
  83 }
  84 #endif
  85
  86 static 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 */