linux_kernel/arch/arm64/include/asm/proc-fns.h

/*
 * Based on arch/arm/include/asm/proc-fns.h
 *
 * Copyright (C) 1997-1999 Russell King
 * Copyright (C) 2000 Deep Blue Solutions Ltd
 * Copyright (C) 2012 ARM Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef __ASM_PROCFNS_H
#define __ASM_PROCFNS_H

#ifdef __KERNEL__
#ifndef __ASSEMBLY__

#include <asm/page.h>

struct mm_struct;
struct cpu_suspend_ctx;

extern void cpu_cache_off(void);
extern void cpu_do_idle(void);
extern void cpu_do_switch_mm(unsigned long pgd_phys, struct mm_struct *mm);
extern void cpu_reset(unsigned long addr) __attribute__((noreturn));
void cpu_soft_restart(phys_addr_t cpu_reset,
		unsigned long addr) __attribute__((noreturn));
extern void cpu_do_suspend(struct cpu_suspend_ctx *ptr);
extern u64 cpu_do_resume(phys_addr_t ptr, u64 idmap_ttbr);

#include <asm/memory.h>

#define cpu_switch_mm(pgd,mm) cpu_do_switch_mm(virt_to_phys(pgd),mm)

#define cpu_get_pgd()					\
({							\
	unsigned long pg;				\
	asm("mrs	%0, ttbr0_el1\n"		\
	    : "=r" (pg));				\
	pg &= ~0xffff000000003ffful;			\
	(pgd_t *)phys_to_virt(pg);			\
})

#endif /* __ASSEMBLY__ */
#endif /* __KERNEL__ */
#endif /* __ASM_PROCFNS_H */