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
53
54
|
#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_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
/*
* IO bus memory addresses are 1:1 with the physical address,
* except on the PCI bus of the Hades.
*/
#ifdef CONFIG_HADES
#define virt_to_bus(a) (virt_to_phys(a) + (MACH_IS_HADES ? 0x80000000 : 0))
#define bus_to_virt(a) (phys_to_virt((a) - (MACH_IS_HADES ? 0x80000000 : 0)))
#else
#define virt_to_bus virt_to_phys
#define bus_to_virt phys_to_virt
#endif
#endif
#endif
|
