aboutsummaryrefslogtreecommitdiffstats
path: root/arch/m68k/include/asm/virtconvert.h
blob: 3f834b3ab5bdad32a2281e80917f8df931a62d31 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
#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.
 */
static inline unsigned long virt_to_phys(void *address)
{
	return __pa(address);
}

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

/* Permanent address of a page. */
#ifdef CONFIG_MMU
#ifdef 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) ({						\
	struct page *__page = _page;					\
	struct pglist_data *pgdat;					\
	pgdat = pg_data_table[page_to_nid(__page)];			\
	page_to_pfn(__page) << PAGE_SHIFT;				\
})
#endif
#else
#define page_to_phys(page)	(((page) - mem_map) << 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