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Tip revision: 0d02ec6b3136c73c09e7859f0d0e4e2c4c07b49b authored by Linus Torvalds on 21 March 2021, 21:56:43 UTC
Linux 5.12-rc4
Tip revision: 0d02ec6
virtconvert.h
/* 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. */
#define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)

/*
 * 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
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