2 * Written by Kanoj Sarcar (kanoj@sgi.com) Aug 99
5 * Copyright (C) 2002 Anton Blanchard, IBM Corp.
10 #include <linux/config.h>
13 #ifdef CONFIG_DISCONTIGMEM
15 extern struct pglist_data node_data[];
18 * Following are specific to this numa platform.
21 extern int numa_cpu_lookup_table[];
22 extern char *numa_memory_lookup_table;
23 extern cpumask_t numa_cpumask_lookup_table[];
24 extern int nr_cpus_in_node[];
26 #define MAX_MEMORY (1UL << 41)
28 #define MEMORY_INCREMENT_SHIFT 24
29 #define MEMORY_INCREMENT (1UL << MEMORY_INCREMENT_SHIFT)
31 /* NUMA debugging, will not work on a DLPAR machine */
34 static inline int pa_to_nid(unsigned long pa)
38 nid = numa_memory_lookup_table[pa >> MEMORY_INCREMENT_SHIFT];
41 /* the physical address passed in is not in the map for the system */
43 printk("bad address: %lx\n", pa);
51 #define pfn_to_nid(pfn) pa_to_nid((pfn) << PAGE_SHIFT)
54 * Return a pointer to the node data for node n.
56 #define NODE_DATA(nid) (&node_data[nid])
58 #define node_localnr(pfn, nid) ((pfn) - NODE_DATA(nid)->node_start_pfn)
61 * Following are macros that each numa implmentation must define.
65 * Given a kernel address, find the home node of the underlying memory.
67 #define kvaddr_to_nid(kaddr) pa_to_nid(__pa(kaddr))
69 #define node_mem_map(nid) (NODE_DATA(nid)->node_mem_map)
70 #define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn)
71 #define node_end_pfn(nid) (NODE_DATA(nid)->node_end_pfn)
73 #define local_mapnr(kvaddr) \
74 ( (__pa(kvaddr) >> PAGE_SHIFT) - node_start_pfn(kvaddr_to_nid(kvaddr))
76 /* Written this way to avoid evaluating arguments twice */
77 #define discontigmem_pfn_to_page(pfn) \
79 unsigned long __tmp = pfn; \
80 (node_mem_map(pfn_to_nid(__tmp)) + \
81 node_localnr(__tmp, pfn_to_nid(__tmp))); \
84 #define discontigmem_page_to_pfn(p) \
86 struct page *__tmp = p; \
87 (((__tmp) - page_zone(__tmp)->zone_mem_map) + \
88 page_zone(__tmp)->zone_start_pfn); \
91 /* XXX fix for discontiguous physical memory */
92 #define discontigmem_pfn_valid(pfn) ((pfn) < num_physpages)
94 #endif /* CONFIG_DISCONTIGMEM */
95 #endif /* _ASM_MMZONE_H_ */