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