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 11 struct thread_struct; 12 struct task_struct; 13 struct pt_regs; 14 15 extern 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 19 extern struct task_struct *_switch(struct thread_struct *prev, 20 struct thread_struct *next); 21 22 extern void switch_booke_debug_regs(struct debug_reg *new_debug); 23 24 extern int emulate_altivec(struct pt_regs *); 25 26 #ifdef CONFIG_PPC_BOOK3S_64 27 void restore_math(struct pt_regs *regs); 28 #else 29 static inline void restore_math(struct pt_regs *regs) 30 { 31 } 32 #endif 33 34 void restore_tm_state(struct pt_regs *regs); 35 36 extern void flush_all_to_thread(struct task_struct *); 37 extern void giveup_all(struct task_struct *); 38 39 #ifdef CONFIG_PPC_FPU 40 extern void enable_kernel_fp(void); 41 extern void flush_fp_to_thread(struct task_struct *); 42 extern void giveup_fpu(struct task_struct *); 43 extern void save_fpu(struct task_struct *); 44 static inline void disable_kernel_fp(void) 45 { 46 msr_check_and_clear(MSR_FP); 47 } 48 #else 49 static inline void save_fpu(struct task_struct *t) { } 50 static inline void flush_fp_to_thread(struct task_struct *t) { } 51 #endif 52 53 #ifdef CONFIG_ALTIVEC 54 extern void enable_kernel_altivec(void); 55 extern void flush_altivec_to_thread(struct task_struct *); 56 extern void giveup_altivec(struct task_struct *); 57 extern void save_altivec(struct task_struct *); 58 static inline void disable_kernel_altivec(void) 59 { 60 msr_check_and_clear(MSR_VEC); 61 } 62 #else 63 static inline void save_altivec(struct task_struct *t) { } 64 static inline void __giveup_altivec(struct task_struct *t) { } 65 static inline void enable_kernel_altivec(void) 66 { 67 BUILD_BUG(); 68 } 69 70 static inline void disable_kernel_altivec(void) 71 { 72 BUILD_BUG(); 73 } 74 #endif 75 76 #ifdef CONFIG_VSX 77 extern void enable_kernel_vsx(void); 78 extern void flush_vsx_to_thread(struct task_struct *); 79 static inline void disable_kernel_vsx(void) 80 { 81 msr_check_and_clear(MSR_FP|MSR_VEC|MSR_VSX); 82 } 83 #else 84 static inline void enable_kernel_vsx(void) 85 { 86 BUILD_BUG(); 87 } 88 89 static inline void disable_kernel_vsx(void) 90 { 91 BUILD_BUG(); 92 } 93 #endif 94 95 #ifdef CONFIG_SPE 96 extern void enable_kernel_spe(void); 97 extern void flush_spe_to_thread(struct task_struct *); 98 extern void giveup_spe(struct task_struct *); 99 extern void __giveup_spe(struct task_struct *); 100 static inline void disable_kernel_spe(void) 101 { 102 msr_check_and_clear(MSR_SPE); 103 } 104 #else 105 static inline void __giveup_spe(struct task_struct *t) { } 106 #endif 107 108 static inline void clear_task_ebb(struct task_struct *t) 109 { 110 #ifdef CONFIG_PPC_BOOK3S_64 111 /* EBB perf events are not inherited, so clear all EBB state. */ 112 t->thread.ebbrr = 0; 113 t->thread.ebbhr = 0; 114 t->thread.bescr = 0; 115 t->thread.mmcr2 = 0; 116 t->thread.mmcr0 = 0; 117 t->thread.siar = 0; 118 t->thread.sdar = 0; 119 t->thread.sier = 0; 120 t->thread.used_ebb = 0; 121 #endif 122 } 123 124 void kvmppc_save_user_regs(void); 125 void kvmppc_save_current_sprs(void); 126 127 extern int set_thread_tidr(struct task_struct *t); 128 129 #endif /* _ASM_POWERPC_SWITCH_TO_H */ 130