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 <linux/sched.h> 9#include <asm/reg.h> 10 11struct thread_struct; 12struct task_struct; 13struct pt_regs; 14 15extern struct task_struct *__switch_to(struct task_struct *, 16 struct task_struct *); 17#define switch_to(prev, next, last) ((last) = __switch_to((prev), (next))) 18 19extern struct task_struct *_switch(struct thread_struct *prev, 20 struct thread_struct *next); 21 22extern void switch_booke_debug_regs(struct debug_reg *new_debug); 23 24extern int emulate_altivec(struct pt_regs *); 25 26#ifdef CONFIG_PPC_BOOK3S_64 27void restore_math(struct pt_regs *regs); 28#else 29static inline void restore_math(struct pt_regs *regs) 30{ 31} 32#endif 33 34void restore_tm_state(struct pt_regs *regs); 35 36extern void flush_all_to_thread(struct task_struct *); 37extern void giveup_all(struct task_struct *); 38 39#ifdef CONFIG_PPC_FPU 40extern void enable_kernel_fp(void); 41extern void flush_fp_to_thread(struct task_struct *); 42extern void giveup_fpu(struct task_struct *); 43extern void save_fpu(struct task_struct *); 44static inline void disable_kernel_fp(void) 45{ 46 msr_check_and_clear(MSR_FP); 47} 48#else 49static inline void save_fpu(struct task_struct *t) { } 50static inline void flush_fp_to_thread(struct task_struct *t) { } 51#endif 52 53#ifdef CONFIG_ALTIVEC 54extern void enable_kernel_altivec(void); 55extern void flush_altivec_to_thread(struct task_struct *); 56extern void giveup_altivec(struct task_struct *); 57extern void save_altivec(struct task_struct *); 58static inline void disable_kernel_altivec(void) 59{ 60 msr_check_and_clear(MSR_VEC); 61} 62#else 63static inline void save_altivec(struct task_struct *t) { } 64static inline void __giveup_altivec(struct task_struct *t) { } 65#endif 66 67#ifdef CONFIG_VSX 68extern void enable_kernel_vsx(void); 69extern void flush_vsx_to_thread(struct task_struct *); 70static inline void disable_kernel_vsx(void) 71{ 72 msr_check_and_clear(MSR_FP|MSR_VEC|MSR_VSX); 73} 74#else 75static inline void enable_kernel_vsx(void) 76{ 77 BUILD_BUG(); 78} 79 80static inline void disable_kernel_vsx(void) 81{ 82 BUILD_BUG(); 83} 84#endif 85 86#ifdef CONFIG_SPE 87extern void enable_kernel_spe(void); 88extern void flush_spe_to_thread(struct task_struct *); 89extern void giveup_spe(struct task_struct *); 90extern void __giveup_spe(struct task_struct *); 91static inline void disable_kernel_spe(void) 92{ 93 msr_check_and_clear(MSR_SPE); 94} 95#else 96static inline void __giveup_spe(struct task_struct *t) { } 97#endif 98 99static inline void clear_task_ebb(struct task_struct *t) 100{ 101#ifdef CONFIG_PPC_BOOK3S_64 102 /* EBB perf events are not inherited, so clear all EBB state. */ 103 t->thread.ebbrr = 0; 104 t->thread.ebbhr = 0; 105 t->thread.bescr = 0; 106 t->thread.mmcr2 = 0; 107 t->thread.mmcr0 = 0; 108 t->thread.siar = 0; 109 t->thread.sdar = 0; 110 t->thread.sier = 0; 111 t->thread.used_ebb = 0; 112#endif 113} 114 115extern int set_thread_tidr(struct task_struct *t); 116 117#endif /* _ASM_POWERPC_SWITCH_TO_H */ 118