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)29static 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)44static inline void disable_kernel_fp(void) 45 { 46 msr_check_and_clear(MSR_FP); 47 } 48 #else save_fpu(struct task_struct * t)49static inline void save_fpu(struct task_struct *t) { } flush_fp_to_thread(struct task_struct * t)50static 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 *); disable_kernel_altivec(void)58static inline void disable_kernel_altivec(void) 59 { 60 msr_check_and_clear(MSR_VEC); 61 } 62 #else save_altivec(struct task_struct * t)63static inline void save_altivec(struct task_struct *t) { } __giveup_altivec(struct task_struct * t)64static inline void __giveup_altivec(struct task_struct *t) { } 65 #endif 66 67 #ifdef CONFIG_VSX 68 extern void enable_kernel_vsx(void); 69 extern void flush_vsx_to_thread(struct task_struct *); disable_kernel_vsx(void)70static inline void disable_kernel_vsx(void) 71 { 72 msr_check_and_clear(MSR_FP|MSR_VEC|MSR_VSX); 73 } 74 #else enable_kernel_vsx(void)75static inline void enable_kernel_vsx(void) 76 { 77 BUILD_BUG(); 78 } 79 disable_kernel_vsx(void)80static inline void disable_kernel_vsx(void) 81 { 82 BUILD_BUG(); 83 } 84 #endif 85 86 #ifdef CONFIG_SPE 87 extern void enable_kernel_spe(void); 88 extern void flush_spe_to_thread(struct task_struct *); 89 extern void giveup_spe(struct task_struct *); 90 extern void __giveup_spe(struct task_struct *); disable_kernel_spe(void)91static inline void disable_kernel_spe(void) 92 { 93 msr_check_and_clear(MSR_SPE); 94 } 95 #else __giveup_spe(struct task_struct * t)96static inline void __giveup_spe(struct task_struct *t) { } 97 #endif 98 clear_task_ebb(struct task_struct * t)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 } 114 115 extern int set_thread_tidr(struct task_struct *t); 116 117 #endif /* _ASM_POWERPC_SWITCH_TO_H */ 118