projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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 | ||
| 1da177e4 | 10 | #include <linux/compiler.h> |
| 12d810c1 | 11 | #include <linux/mmzone.h> |
| 1da177e4 LT |
12 | #include <asm/setup.h> |
| 13 | #include <asm/page.h> | |
| 14 | ||
| 1da177e4 LT |
15 | /* |
| 16 | * Change virtual addresses to physical addresses and vv. | |
| 17 | */ | |
| 1da177e4 LT |
18 | static inline unsigned long virt_to_phys(void *address) |
| 19 | { | |
| 12d810c1 | 20 | return __pa(address); |
| 1da177e4 LT |
21 | } |
| 22 | ||
| 23 | static inline void *phys_to_virt(unsigned long address) | |
| 24 | { | |
| 12d810c1 | 25 | return __va(address); |
| 1da177e4 | 26 | } |
| 1da177e4 LT |
27 | |
| 28 | /* Permanent address of a page. */ | |
| 12d810c1 RZ |
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 | |
| 1da177e4 LT |
40 | |
| 41 | /* | |
| 42 | * IO bus memory addresses are 1:1 with the physical address, | |
| 43 | * except on the PCI bus of the Hades. | |
| 44 | */ | |
| 45 | #ifdef CONFIG_HADES | |
| 46 | #define virt_to_bus(a) (virt_to_phys(a) + (MACH_IS_HADES ? 0x80000000 : 0)) | |
| 47 | #define bus_to_virt(a) (phys_to_virt((a) - (MACH_IS_HADES ? 0x80000000 : 0))) | |
| 48 | #else | |
| 49 | #define virt_to_bus virt_to_phys | |
| 50 | #define bus_to_virt phys_to_virt | |
| 51 | #endif | |
| 52 | ||
| 53 | #endif | |
| 54 | #endif |