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 restore_math(struct pt_regs * regs)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 *); disable_kernel_fp(void)44 static inline void disable_kernel_fp(void) 45 { 46 msr_check_and_clear(MSR_FP); 47 } 48 #else save_fpu(struct task_struct * t)49 static inline void save_fpu(struct task_struct *t) { } flush_fp_to_thread(struct task_struct * t)50 static inline void flush_fp_to_thread(struct task_struct *t) { } enable_kernel_fp(void)51 static inline void enable_kernel_fp(void) 52 { 53 BUILD_BUG(); 54 } 55 #endif 56 57 #ifdef CONFIG_ALTIVEC 58 extern void enable_kernel_altivec(void); 59 extern void flush_altivec_to_thread(struct task_struct *); 60 extern void giveup_altivec(struct task_struct *); 61 extern void save_altivec(struct task_struct *); disable_kernel_altivec(void)62 static inline void disable_kernel_altivec(void) 63 { 64 msr_check_and_clear(MSR_VEC); 65 } 66 #else save_altivec(struct task_struct * t)67 static inline void save_altivec(struct task_struct *t) { } __giveup_altivec(struct task_struct * t)68 static inline void __giveup_altivec(struct task_struct *t) { } enable_kernel_altivec(void)69 static inline void enable_kernel_altivec(void) 70 { 71 BUILD_BUG(); 72 } 73 disable_kernel_altivec(void)74 static inline void disable_kernel_altivec(void) 75 { 76 BUILD_BUG(); 77 } 78 #endif 79 80 #ifdef CONFIG_VSX 81 extern void enable_kernel_vsx(void); 82 extern void flush_vsx_to_thread(struct task_struct *); disable_kernel_vsx(void)83 static inline void disable_kernel_vsx(void) 84 { 85 msr_check_and_clear(MSR_FP|MSR_VEC|MSR_VSX); 86 } 87 #else enable_kernel_vsx(void)88 static inline void enable_kernel_vsx(void) 89 { 90 BUILD_BUG(); 91 } 92 disable_kernel_vsx(void)93 static inline void disable_kernel_vsx(void) 94 { 95 BUILD_BUG(); 96 } 97 #endif 98 99 #ifdef CONFIG_SPE 100 extern void enable_kernel_spe(void); 101 extern void flush_spe_to_thread(struct task_struct *); 102 extern void giveup_spe(struct task_struct *); 103 extern void __giveup_spe(struct task_struct *); disable_kernel_spe(void)104 static inline void disable_kernel_spe(void) 105 { 106 msr_check_and_clear(MSR_SPE); 107 } 108 #else __giveup_spe(struct task_struct * t)109 static inline void __giveup_spe(struct task_struct *t) { } 110 #endif 111 clear_task_ebb(struct task_struct * t)112 static 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 } 127 128 void kvmppc_save_user_regs(void); 129 void kvmppc_save_current_sprs(void); 130 131 extern int set_thread_tidr(struct task_struct *t); 132 133 #endif /* _ASM_POWERPC_SWITCH_TO_H */ 134