arch/powerpc/include/asm/switch_to.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu>
   4  */
   5 #ifndef _ASM_POWERPC_SWITCH_TO_H
   6 #define _ASM_POWERPC_SWITCH_TO_H
   7
   8 #include <asm/reg.h>
   9
  10 struct thread_struct;
  11 struct task_struct;
  12 struct pt_regs;
  13
  14 extern struct task_struct *__switch_to(struct task_struct *,
  15         struct task_struct *);
  16 #define switch_to(prev, next, last)     ((last) = __switch_to((prev), (next)))
  17
  18 extern struct task_struct *_switch(struct thread_struct *prev,
  19                                    struct thread_struct *next);
  20
  21 extern void switch_booke_debug_regs(struct debug_reg *new_debug);
  22
  23 extern int emulate_altivec(struct pt_regs *);
  24
  25 extern void flush_all_to_thread(struct task_struct *);
  26 extern void giveup_all(struct task_struct *);
  27
  28 #ifdef CONFIG_PPC_FPU
  29 extern void enable_kernel_fp(void);
  30 extern void flush_fp_to_thread(struct task_struct *);
  31 extern void giveup_fpu(struct task_struct *);
  32 extern void save_fpu(struct task_struct *);
  33 static inline void disable_kernel_fp(void)
  34 {
  35         msr_check_and_clear(MSR_FP);
  36 }
  37 #else
  38 static inline void __giveup_fpu(struct task_struct *t) { }
  39 static inline void save_fpu(struct task_struct *t) { }
  40 static inline void flush_fp_to_thread(struct task_struct *t) { }
  41 #endif
  42
  43 #ifdef CONFIG_ALTIVEC
  44 extern void enable_kernel_altivec(void);
  45 extern void flush_altivec_to_thread(struct task_struct *);
  46 extern void giveup_altivec(struct task_struct *);
  47 extern void save_altivec(struct task_struct *);
  48 static inline void disable_kernel_altivec(void)
  49 {
  50         msr_check_and_clear(MSR_VEC);
  51 }
  52 #else
  53 static inline void save_altivec(struct task_struct *t) { }
  54 static inline void __giveup_altivec(struct task_struct *t) { }
  55 #endif
  56
  57 #ifdef CONFIG_VSX
  58 extern void enable_kernel_vsx(void);
  59 extern void flush_vsx_to_thread(struct task_struct *);
  60 static inline void disable_kernel_vsx(void)
  61 {
  62         msr_check_and_clear(MSR_FP|MSR_VEC|MSR_VSX);
  63 }
  64 #endif
  65
  66 #ifdef CONFIG_SPE
  67 extern void enable_kernel_spe(void);
  68 extern void flush_spe_to_thread(struct task_struct *);
  69 extern void giveup_spe(struct task_struct *);
  70 extern void __giveup_spe(struct task_struct *);
  71 static inline void disable_kernel_spe(void)
  72 {
  73         msr_check_and_clear(MSR_SPE);
  74 }
  75 #else
  76 static inline void __giveup_spe(struct task_struct *t) { }
  77 #endif
  78
  79 static inline void clear_task_ebb(struct task_struct *t)
  80 {
  81 #ifdef CONFIG_PPC_BOOK3S_64
  82     /* EBB perf events are not inherited, so clear all EBB state. */
  83     t->thread.ebbrr = 0;
  84     t->thread.ebbhr = 0;
  85     t->thread.bescr = 0;
  86     t->thread.mmcr2 = 0;
  87     t->thread.mmcr0 = 0;
  88     t->thread.siar = 0;
  89     t->thread.sdar = 0;
  90     t->thread.sier = 0;
  91     t->thread.used_ebb = 0;
  92 #endif
  93 }
  94
  95 extern int set_thread_uses_vas(void);
  96
  97 extern int set_thread_tidr(struct task_struct *t);
  98 extern void clear_thread_tidr(struct task_struct *t);
  99
 100 #endif /* _ASM_POWERPC_SWITCH_TO_H */