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_SINGLE_MEMORY_CHUNK 30 #define page_to_phys(page) \ 31 __pa(PAGE_OFFSET + (((page) - pg_data_map[0].node_mem_map) << PAGE_SHIFT)) 32 #else 33 #define page_to_phys(_page) ({ \ 34 struct page *__page = _page; \ 35 struct pglist_data *pgdat; \ 36 pgdat = pg_data_table[page_to_nid(__page)]; \ 37 page_to_pfn(__page) << PAGE_SHIFT; \ 38 }) 39 #endif 40 41 /* 42 * IO bus memory addresses are 1:1 with the physical address, 43 */ 44 #define virt_to_bus virt_to_phys 45 #define bus_to_virt phys_to_virt 46 47 #endif 48 #endif 49