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Linux/arch/powerpc/include/asm/switch_to.h

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  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 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 static inline void disable_kernel_vsx(void)
 60 {
 61         msr_check_and_clear(MSR_FP|MSR_VEC|MSR_VSX);
 62 }
 63 #endif
 64 
 65 #ifdef CONFIG_SPE
 66 extern void enable_kernel_spe(void);
 67 extern void flush_spe_to_thread(struct task_struct *);
 68 extern void giveup_spe(struct task_struct *);
 69 extern void __giveup_spe(struct task_struct *);
 70 static inline void disable_kernel_spe(void)
 71 {
 72         msr_check_and_clear(MSR_SPE);
 73 }
 74 #else
 75 static inline void __giveup_spe(struct task_struct *t) { }
 76 #endif
 77 
 78 static inline void clear_task_ebb(struct task_struct *t)
 79 {
 80 #ifdef CONFIG_PPC_BOOK3S_64
 81     /* EBB perf events are not inherited, so clear all EBB state. */
 82     t->thread.ebbrr = 0;
 83     t->thread.ebbhr = 0;
 84     t->thread.bescr = 0;
 85     t->thread.mmcr2 = 0;
 86     t->thread.mmcr0 = 0;
 87     t->thread.siar = 0;
 88     t->thread.sdar = 0;
 89     t->thread.sier = 0;
 90     t->thread.used_ebb = 0;
 91 #endif
 92 }
 93 
 94 extern int set_thread_uses_vas(void);
 95 
 96 extern int set_thread_tidr(struct task_struct *t);
 97 
 98 #endif /* _ASM_POWERPC_SWITCH_TO_H */
 99 

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