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 18 #define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT)) 19 /* 20 * pfn_valid should be made as fast as possible, and the current definition 21 * is valid for machines that are NUMA, but still contiguous, which is what 22 * is currently supported. A more generalised, but slower definition would 23 * be something like this - mbligh: 24 * ( pfn_to_pgdat(pfn) && ((pfn) < node_end_pfn(pfn_to_nid(pfn))) ) 25 */ 26 #if 1 /* M32R_FIXME */ 27 #define pfn_valid(pfn) (1) 28 #else 29 #define pfn_valid(pfn) ((pfn) < num_physpages) 30 #endif 31 32 /* 33 * generic node memory support, the following assumptions apply: 34 */ 35 pfn_to_nid(unsigned long pfn)36static __inline__ int pfn_to_nid(unsigned long pfn) 37 { 38 int node; 39 40 for (node = 0 ; node < MAX_NUMNODES ; node++) 41 if (pfn >= node_start_pfn(node) && pfn < node_end_pfn(node)) 42 break; 43 44 return node; 45 } 46 pfn_to_pgdat(unsigned long pfn)47static __inline__ struct pglist_data *pfn_to_pgdat(unsigned long pfn) 48 { 49 return(NODE_DATA(pfn_to_nid(pfn))); 50 } 51 52 #endif /* CONFIG_DISCONTIGMEM */ 53 #endif /* _ASM_MMZONE_H_ */ 54