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 10struct thread_struct; 11struct task_struct; 12struct pt_regs; 13 14extern 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 18extern struct task_struct *_switch(struct thread_struct *prev, 19 struct thread_struct *next); 20 21extern void switch_booke_debug_regs(struct debug_reg *new_debug); 22 23extern int emulate_altivec(struct pt_regs *); 24 25extern void flush_all_to_thread(struct task_struct *); 26extern void giveup_all(struct task_struct *); 27 28#ifdef CONFIG_PPC_FPU 29extern void enable_kernel_fp(void); 30extern void flush_fp_to_thread(struct task_struct *); 31extern void giveup_fpu(struct task_struct *); 32extern void save_fpu(struct task_struct *); 33static inline void disable_kernel_fp(void) 34{ 35 msr_check_and_clear(MSR_FP); 36} 37#else 38static inline void save_fpu(struct task_struct *t) { } 39static inline void flush_fp_to_thread(struct task_struct *t) { } 40#endif 41 42#ifdef CONFIG_ALTIVEC 43extern void enable_kernel_altivec(void); 44extern void flush_altivec_to_thread(struct task_struct *); 45extern void giveup_altivec(struct task_struct *); 46extern void save_altivec(struct task_struct *); 47static inline void disable_kernel_altivec(void) 48{ 49 msr_check_and_clear(MSR_VEC); 50} 51#else 52static inline void save_altivec(struct task_struct *t) { } 53static inline void __giveup_altivec(struct task_struct *t) { } 54#endif 55 56#ifdef CONFIG_VSX 57extern void enable_kernel_vsx(void); 58extern void flush_vsx_to_thread(struct task_struct *); 59static 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 66extern void enable_kernel_spe(void); 67extern void flush_spe_to_thread(struct task_struct *); 68extern void giveup_spe(struct task_struct *); 69extern void __giveup_spe(struct task_struct *); 70static inline void disable_kernel_spe(void) 71{ 72 msr_check_and_clear(MSR_SPE); 73} 74#else 75static inline void __giveup_spe(struct task_struct *t) { } 76#endif 77 78static 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 94extern int set_thread_tidr(struct task_struct *t); 95 96#endif /* _ASM_POWERPC_SWITCH_TO_H */ 97