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