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