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 #include <asm/reg.h>
   8
   9 struct thread_struct;
  10 struct task_struct;
  11 struct pt_regs;
  12
  13 extern struct task_struct *__switch_to(struct task_struct *,
  14         struct task_struct *);
  15 #define switch_to(prev, next, last)     ((last) = __switch_to((prev), (next)))
  16
  17 extern struct task_struct *_switch(struct thread_struct *prev,
  18                                    struct thread_struct *next);
  19
  20 extern void switch_booke_debug_regs(struct debug_reg *new_debug);
  21
  22 extern int emulate_altivec(struct pt_regs *);
  23
  24 extern void flush_all_to_thread(struct task_struct *);
  25 extern void giveup_all(struct task_struct *);
  26
  27 #ifdef CONFIG_PPC_FPU
  28 extern void enable_kernel_fp(void);
  29 extern void flush_fp_to_thread(struct task_struct *);
  30 extern void giveup_fpu(struct task_struct *);
  31 extern void save_fpu(struct task_struct *);
  32 static inline void disable_kernel_fp(void)
  33 {
  34         msr_check_and_clear(MSR_FP);
  35 }
  36 #else
  37 static inline void __giveup_fpu(struct task_struct *t) { }
  38 static inline void save_fpu(struct task_struct *t) { }
  39 static inline void flush_fp_to_thread(struct task_struct *t) { }
  40 #endif
  41
  42 #ifdef CONFIG_ALTIVEC
  43 extern void enable_kernel_altivec(void);
  44 extern void flush_altivec_to_thread(struct task_struct *);
  45 extern void giveup_altivec(struct task_struct *);
  46 extern void save_altivec(struct task_struct *);
  47 static inline void disable_kernel_altivec(void)
  48 {
  49         msr_check_and_clear(MSR_VEC);
  50 }
  51 #else
  52 static inline void save_altivec(struct task_struct *t) { }
  53 static inline void __giveup_altivec(struct task_struct *t) { }
  54 #endif
  55
  56 #ifdef CONFIG_VSX
  57 extern void enable_kernel_vsx(void);
  58 extern void flush_vsx_to_thread(struct task_struct *);
  59 extern void giveup_vsx(struct task_struct *);
  60 extern void __giveup_vsx(struct task_struct *);
  61 static inline void disable_kernel_vsx(void)
  62 {
  63         msr_check_and_clear(MSR_FP|MSR_VEC|MSR_VSX);
  64 }
  65 #else
  66 static inline void __giveup_vsx(struct task_struct *t) { }
  67 #endif
  68
  69 #ifdef CONFIG_SPE
  70 extern void enable_kernel_spe(void);
  71 extern void flush_spe_to_thread(struct task_struct *);
  72 extern void giveup_spe(struct task_struct *);
  73 extern void __giveup_spe(struct task_struct *);
  74 static inline void disable_kernel_spe(void)
  75 {
  76         msr_check_and_clear(MSR_SPE);
  77 }
  78 #else
  79 static inline void __giveup_spe(struct task_struct *t) { }
  80 #endif
  81
  82 static inline void clear_task_ebb(struct task_struct *t)
  83 {
  84 #ifdef CONFIG_PPC_BOOK3S_64
  85     /* EBB perf events are not inherited, so clear all EBB state. */
  86     t->thread.ebbrr = 0;
  87     t->thread.ebbhr = 0;
  88     t->thread.bescr = 0;
  89     t->thread.mmcr2 = 0;
  90     t->thread.mmcr0 = 0;
  91     t->thread.siar = 0;
  92     t->thread.sdar = 0;
  93     t->thread.sier = 0;
  94     t->thread.used_ebb = 0;
  95 #endif
  96 }
  97
  98 #endif /* _ASM_POWERPC_SWITCH_TO_H */