xref: /linux/arch/m68k/include/asm/virtconvert.h (revision 623b4ac4bf9e767991c66e29b47dd4b19458fb42)
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  */
18 static inline unsigned long virt_to_phys(void *address)
19 {
20 	return __pa(address);
21 }
22 
23 static 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) ({						\
35 	struct page *__page = _page;					\
36 	struct pglist_data *pgdat;					\
37 	pgdat = pg_data_table[page_to_nid(__page)];			\
38 	page_to_pfn(__page) << PAGE_SHIFT;				\
39 })
40 #endif
41 #else
42 #define page_to_phys(page)	(((page) - mem_map) << PAGE_SHIFT)
43 #endif
44 
45 /*
46  * IO bus memory addresses are 1:1 with the physical address,
47  */
48 #define virt_to_bus virt_to_phys
49 #define bus_to_virt phys_to_virt
50 
51 #endif
52 #endif
53