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) { } 51static inline void enable_kernel_fp(void) 52{ 53 BUILD_BUG(); 54} 55#endif 56 57#ifdef CONFIG_ALTIVEC 58extern void enable_kernel_altivec(void); 59extern void flush_altivec_to_thread(struct task_struct *); 60extern void giveup_altivec(struct task_struct *); 61extern void save_altivec(struct task_struct *); 62static inline void disable_kernel_altivec(void) 63{ 64 msr_check_and_clear(MSR_VEC); 65} 66#else 67static inline void save_altivec(struct task_struct *t) { } 68static inline void __giveup_altivec(struct task_struct *t) { } 69static inline void enable_kernel_altivec(void) 70{ 71 BUILD_BUG(); 72} 73 74static inline void disable_kernel_altivec(void) 75{ 76 BUILD_BUG(); 77} 78#endif 79 80#ifdef CONFIG_VSX 81extern void enable_kernel_vsx(void); 82extern void flush_vsx_to_thread(struct task_struct *); 83static inline void disable_kernel_vsx(void) 84{ 85 msr_check_and_clear(MSR_FP|MSR_VEC|MSR_VSX); 86} 87#else 88static inline void enable_kernel_vsx(void) 89{ 90 BUILD_BUG(); 91} 92 93static inline void disable_kernel_vsx(void) 94{ 95 BUILD_BUG(); 96} 97#endif 98 99#ifdef CONFIG_SPE 100extern void enable_kernel_spe(void); 101extern void flush_spe_to_thread(struct task_struct *); 102extern void giveup_spe(struct task_struct *); 103extern void __giveup_spe(struct task_struct *); 104static inline void disable_kernel_spe(void) 105{ 106 msr_check_and_clear(MSR_SPE); 107} 108#else 109static inline void __giveup_spe(struct task_struct *t) { } 110#endif 111 112static inline void clear_task_ebb(struct task_struct *t) 113{ 114#ifdef CONFIG_PPC_BOOK3S_64 115 /* EBB perf events are not inherited, so clear all EBB state. */ 116 t->thread.ebbrr = 0; 117 t->thread.ebbhr = 0; 118 t->thread.bescr = 0; 119 t->thread.mmcr2 = 0; 120 t->thread.mmcr0 = 0; 121 t->thread.siar = 0; 122 t->thread.sdar = 0; 123 t->thread.sier = 0; 124 t->thread.used_ebb = 0; 125#endif 126} 127 128void kvmppc_save_user_regs(void); 129void kvmppc_save_current_sprs(void); 130 131extern int set_thread_tidr(struct task_struct *t); 132 133#endif /* _ASM_POWERPC_SWITCH_TO_H */ 134