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
  19 extern void giveup_fpu(struct task_struct *);
  20 extern void load_up_fpu(void);
  21 extern void enable_kernel_fp(void);
  22 extern void flush_fp_to_thread(struct task_struct *);
  23 extern void enable_kernel_altivec(void);
  24 extern void load_up_altivec(struct task_struct *);
  25 extern int emulate_altivec(struct pt_regs *);
  26 extern void __giveup_vsx(struct task_struct *);
  27 extern void giveup_vsx(struct task_struct *);
  28 extern void enable_kernel_spe(void);
  29 extern void giveup_spe(struct task_struct *);
  30 extern void load_up_spe(struct task_struct *);
  31
  32 #ifndef CONFIG_SMP
  33 extern void discard_lazy_cpu_state(void);
  34 #else
  35 static inline void discard_lazy_cpu_state(void)
  36 {
  37 }
  38 #endif
  39
  40 #ifdef CONFIG_ALTIVEC
  41 extern void flush_altivec_to_thread(struct task_struct *);
  42 extern void giveup_altivec(struct task_struct *);
  43 extern void giveup_altivec_notask(void);
  44 #else
  45 static inline void flush_altivec_to_thread(struct task_struct *t)
  46 {
  47 }
  48 static inline void giveup_altivec(struct task_struct *t)
  49 {
  50 }
  51 #endif
  52
  53 #ifdef CONFIG_VSX
  54 extern void flush_vsx_to_thread(struct task_struct *);
  55 #else
  56 static inline void flush_vsx_to_thread(struct task_struct *t)
  57 {
  58 }
  59 #endif
  60
  61 #ifdef CONFIG_SPE
  62 extern void flush_spe_to_thread(struct task_struct *);
  63 #else
  64 static inline void flush_spe_to_thread(struct task_struct *t)
  65 {
  66 }
  67 #endif
  68
  69 static inline void clear_task_ebb(struct task_struct *t)
  70 {
  71 #ifdef CONFIG_PPC_BOOK3S_64
  72     /* EBB perf events are not inherited, so clear all EBB state. */
  73     t->thread.bescr = 0;
  74     t->thread.mmcr2 = 0;
  75     t->thread.mmcr0 = 0;
  76     t->thread.siar = 0;
  77     t->thread.sdar = 0;
  78     t->thread.sier = 0;
  79     t->thread.used_ebb = 0;
  80 #endif
  81 }
  82
  83 #endif /* _ASM_POWERPC_SWITCH_TO_H */