| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Written by Pat Gaughen (gone@us.ibm.com) Mar 2002 |
| 3 | * |
| 4 | */ |
| 5 | |
| 6 | #ifndef _ASM_MMZONE_H_ |
| 7 | #define _ASM_MMZONE_H_ |
| 8 | |
| 9 | #include <asm/smp.h> |
| 10 | |
| 11 | #ifdef CONFIG_DISCONTIGMEM |
| 12 | |
| 13 | extern struct pglist_data *node_data[]; |
| 14 | #define NODE_DATA(nid) (node_data[nid]) |
| 15 | |
| 16 | #define node_localnr(pfn, nid) ((pfn) - NODE_DATA(nid)->node_start_pfn) |
| 17 | #define node_mem_map(nid) (NODE_DATA(nid)->node_mem_map) |
| 18 | #define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn) |
| 19 | #define node_end_pfn(nid) \ |
| 20 | ({ \ |
| 21 | pg_data_t *__pgdat = NODE_DATA(nid); \ |
| 22 | __pgdat->node_start_pfn + __pgdat->node_spanned_pages - 1; \ |
| 23 | }) |
| 24 | |
| 25 | #define local_mapnr(kvaddr) \ |
| 26 | ({ \ |
| 27 | unsigned long __pfn = __pa(kvaddr) >> PAGE_SHIFT; \ |
| 28 | (__pfn - node_start_pfn(pfn_to_nid(__pfn))); \ |
| 29 | }) |
| 30 | |
| 31 | #define pfn_to_page(pfn) \ |
| 32 | ({ \ |
| 33 | unsigned long __pfn = pfn; \ |
| 34 | int __node = pfn_to_nid(__pfn); \ |
| 35 | &node_mem_map(__node)[node_localnr(__pfn,__node)]; \ |
| 36 | }) |
| 37 | |
| 38 | #define page_to_pfn(pg) \ |
| 39 | ({ \ |
| 40 | struct page *__page = pg; \ |
| 41 | struct zone *__zone = page_zone(__page); \ |
| 42 | (unsigned long)(__page - __zone->zone_mem_map) \ |
| 43 | + __zone->zone_start_pfn; \ |
| 44 | }) |
| 45 | #define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT)) |
| 46 | /* |
| 47 | * pfn_valid should be made as fast as possible, and the current definition |
| 48 | * is valid for machines that are NUMA, but still contiguous, which is what |
| 49 | * is currently supported. A more generalised, but slower definition would |
| 50 | * be something like this - mbligh: |
| 51 | * ( pfn_to_pgdat(pfn) && ((pfn) < node_end_pfn(pfn_to_nid(pfn))) ) |
| 52 | */ |
| 53 | #if 1 /* M32R_FIXME */ |
| 54 | #define pfn_valid(pfn) (1) |
| 55 | #else |
| 56 | #define pfn_valid(pfn) ((pfn) < num_physpages) |
| 57 | #endif |
| 58 | |
| 59 | /* |
| 60 | * generic node memory support, the following assumptions apply: |
| 61 | */ |
| 62 | |
| 63 | static __inline__ int pfn_to_nid(unsigned long pfn) |
| 64 | { |
| 65 | int node; |
| 66 | |
| 67 | for (node = 0 ; node < MAX_NUMNODES ; node++) |
| 68 | if (pfn >= node_start_pfn(node) && pfn <= node_end_pfn(node)) |
| 69 | break; |
| 70 | |
| 71 | return node; |
| 72 | } |
| 73 | |
| 74 | static __inline__ struct pglist_data *pfn_to_pgdat(unsigned long pfn) |
| 75 | { |
| 76 | return(NODE_DATA(pfn_to_nid(pfn))); |
| 77 | } |
| 78 | |
| 79 | #endif /* CONFIG_DISCONTIGMEM */ |
| 80 | #endif /* _ASM_MMZONE_H_ */ |