Cregit: Linux 5.2: virtconvert.h

Contributors: 7
Author	Tokens	Token Proportion	Commits	Commit Proportion
Linus Torvalds (pre-git)	61	54.46%	2	16.67%
Geert Uytterhoeven	18	16.07%	4	33.33%
Roman Zippel	13	11.61%	1	8.33%
Steven King	9	8.04%	1	8.33%
Greg Ungerer	9	8.04%	2	16.67%
Adrian Bunk	1	0.89%	1	8.33%
Greg Kroah-Hartman	1	0.89%	1	8.33%
Total	112		12

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __VIRT_CONVERT__
#define __VIRT_CONVERT__

/*
 * Macros used for converting between virtual and physical mappings.
 */

#ifdef __KERNEL__

#include <linux/compiler.h>
#include <linux/mmzone.h>
#include <asm/setup.h>
#include <asm/page.h>

/*
 * Change virtual addresses to physical addresses and vv.
 */
#define virt_to_phys virt_to_phys
static inline unsigned long virt_to_phys(void *address)
{
	return __pa(address);
}

#define phys_to_virt phys_to_virt
static inline void *phys_to_virt(unsigned long address)
{
	return __va(address);
}

/* Permanent address of a page. */
#if defined(CONFIG_MMU) && defined(CONFIG_SINGLE_MEMORY_CHUNK)
#define page_to_phys(page) \
	__pa(PAGE_OFFSET + (((page) - pg_data_map[0].node_mem_map) << PAGE_SHIFT))
#else
#define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)
#endif

/*
 * IO bus memory addresses are 1:1 with the physical address,
 */
#define virt_to_bus virt_to_phys
#define bus_to_virt phys_to_virt

#endif
#endif