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/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu>
 */
#ifndef _ASM_POWERPC_SWITCH_TO_H
#define _ASM_POWERPC_SWITCH_TO_H

#include <linux/sched.h>
#include <asm/reg.h>

struct thread_struct;
struct task_struct;
struct pt_regs;

extern struct task_struct *__switch_to(struct task_struct *,
	struct task_struct *);
#define switch_to(prev, next, last)	((last) = __switch_to((prev), (next)))

extern struct task_struct *_switch(struct thread_struct *prev,
				   struct thread_struct *next);

extern void switch_booke_debug_regs(struct debug_reg *new_debug);

extern int emulate_altivec(struct pt_regs *);

#ifdef CONFIG_PPC_BOOK3S_64
void restore_math(struct pt_regs *regs);
#else
static inline void restore_math(struct pt_regs *regs)
{
}
#endif

void restore_tm_state(struct pt_regs *regs);

extern void flush_all_to_thread(struct task_struct *);
extern void giveup_all(struct task_struct *);

#ifdef CONFIG_PPC_FPU
extern void enable_kernel_fp(void);
extern void flush_fp_to_thread(struct task_struct *);
extern void giveup_fpu(struct task_struct *);
extern void save_fpu(struct task_struct *);
static inline void disable_kernel_fp(void)
{
	msr_check_and_clear(MSR_FP);
}
#else
static inline void save_fpu(struct task_struct *t) { }
static inline void flush_fp_to_thread(struct task_struct *t) { }
#endif

#ifdef CONFIG_ALTIVEC
extern void enable_kernel_altivec(void);
extern void flush_altivec_to_thread(struct task_struct *);
extern void giveup_altivec(struct task_struct *);
extern void save_altivec(struct task_struct *);
static inline void disable_kernel_altivec(void)
{
	msr_check_and_clear(MSR_VEC);
}
#else
static inline void save_altivec(struct task_struct *t) { }
static inline void __giveup_altivec(struct task_struct *t) { }
#endif

#ifdef CONFIG_VSX
extern void enable_kernel_vsx(void);
extern void flush_vsx_to_thread(struct task_struct *);
static inline void disable_kernel_vsx(void)
{
	msr_check_and_clear(MSR_FP|MSR_VEC|MSR_VSX);
}
#else
static inline void enable_kernel_vsx(void)
{
	BUILD_BUG();
}

static inline void disable_kernel_vsx(void)
{
	BUILD_BUG();
}
#endif

#ifdef CONFIG_SPE
extern void enable_kernel_spe(void);
extern void flush_spe_to_thread(struct task_struct *);
extern void giveup_spe(struct task_struct *);
extern void __giveup_spe(struct task_struct *);
static inline void disable_kernel_spe(void)
{
	msr_check_and_clear(MSR_SPE);
}
#else
static inline void __giveup_spe(struct task_struct *t) { }
#endif

static inline void clear_task_ebb(struct task_struct *t)
{
#ifdef CONFIG_PPC_BOOK3S_64
    /* EBB perf events are not inherited, so clear a