1#ifndef __VIRT_CONVERT__
 2#define __VIRT_CONVERT__
 3
 4/*
 5 * Macros used for converting between virtual and physical mappings.
 6 */
 7
 8#ifdef __KERNEL__
 9
10#include <linux/compiler.h>
11#include <linux/mmzone.h>
12#include <asm/setup.h>
13#include <asm/page.h>
14
15/*
16 * Change virtual addresses to physical addresses and vv.
17 */
18static inline unsigned long virt_to_phys(void *address)
19{
20	return __pa(address);
21}
22
23static inline void *phys_to_virt(unsigned long address)
24{
25	return __va(address);
26}
27
28/* Permanent address of a page. */
29#ifdef CONFIG_MMU
30#ifdef CONFIG_SINGLE_MEMORY_CHUNK
31#define page_to_phys(page) \
32	__pa(PAGE_OFFSET + (((page) - pg_data_map[0].node_mem_map) << PAGE_SHIFT))
33#else
34#define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)
35#endif
36#else
37#define page_to_phys(page)	(((page) - mem_map) << PAGE_SHIFT)
38#endif
39
40/*
41 * IO bus memory addresses are 1:1 with the physical address,
42 */
43#define virt_to_bus virt_to_phys
44#define bus_to_virt phys_to_virt
45
46#endif
47#endif