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Current File : //proc/self/root/lib/modules/5.4.0-1103-aws/build/arch/riscv/include/asm/switch_to.h
/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2012 Regents of the University of California
 */

#ifndef _ASM_RISCV_SWITCH_TO_H
#define _ASM_RISCV_SWITCH_TO_H

#include <linux/sched/task_stack.h>
#include <asm/processor.h>
#include <asm/ptrace.h>
#include <asm/csr.h>

#ifdef CONFIG_FPU
extern void __fstate_save(struct task_struct *save_to);
extern void __fstate_restore(struct task_struct *restore_from);

static inline void __fstate_clean(struct pt_regs *regs)
{
	regs->sstatus = (regs->sstatus & ~SR_FS) | SR_FS_CLEAN;
}

static inline void fstate_off(struct task_struct *task,
			      struct pt_regs *regs)
{
	regs->sstatus = (regs->sstatus & ~SR_FS) | SR_FS_OFF;
}

static inline void fstate_save(struct task_struct *task,
			       struct pt_regs *regs)
{
	if ((regs->sstatus & SR_FS) == SR_FS_DIRTY) {
		__fstate_save(task);
		__fstate_clean(regs);
	}
}

static inline void fstate_restore(struct task_struct *task,
				  struct pt_regs *regs)
{
	if ((regs->sstatus & SR_FS) != SR_FS_OFF) {
		__fstate_restore(task);
		__fstate_clean(regs);
	}
}

static inline void __switch_to_aux(struct task_struct *prev,
				   struct task_struct *next)
{
	struct pt_regs *regs;

	regs = task_pt_regs(prev);
	if (unlikely(regs->sstatus & SR_SD))
		fstate_save(prev, regs);
	fstate_restore(next, task_pt_regs(next));
}

extern bool has_fpu;
#else
#define has_fpu false
#define fstate_save(task, regs) do { } while (0)
#define fstate_restore(task, regs) do { } while (0)
#define __switch_to_aux(__prev, __next) do { } while (0)
#endif

extern struct task_struct *__switch_to(struct task_struct *,
				       struct task_struct *);

#define switch_to(prev, next, last)			\
do {							\
	struct task_struct *__prev = (prev);		\
	struct task_struct *__next = (next);		\
	if (has_fpu)					\
		__switch_to_aux(__prev, __next);	\
	((last) = __switch_to(__prev, __next));		\
} while (0)

#endif /* _ASM_RISCV_SWITCH_TO_H */

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