2 * Written by Kanoj Sarcar (kanoj@sgi.com) Aug 99
5 * Copyright (C) 2002 Anton Blanchard, IBM Corp.
10 #include <linux/config.h>
13 /* generic non-linear memory support:
15 * 1) we will not split memory into more chunks than will fit into the
16 * flags field of the struct page
20 #ifdef CONFIG_NEED_MULTIPLE_NODES
22 extern struct pglist_data *node_data[];
24 * Return a pointer to the node data for node n.
26 #define NODE_DATA(nid) (node_data[nid])
29 * Following are specific to this numa platform.
32 extern int numa_cpu_lookup_table[];
33 extern char *numa_memory_lookup_table;
34 extern cpumask_t numa_cpumask_lookup_table[];
35 extern int nr_cpus_in_node[];
36 #ifdef CONFIG_MEMORY_HOTPLUG
37 extern unsigned long max_pfn;
41 #define MEMORY_INCREMENT_SHIFT 24
42 #define MEMORY_INCREMENT (1UL << MEMORY_INCREMENT_SHIFT)
44 /* NUMA debugging, will not work on a DLPAR machine */
47 static inline int pa_to_nid(unsigned long pa)
51 #ifdef CONFIG_MEMORY_HOTPLUG
52 /* kludge hot added sections default to node 0 */
53 if (pa >= (max_pfn << PAGE_SHIFT))
56 nid = numa_memory_lookup_table[pa >> MEMORY_INCREMENT_SHIFT];
59 /* the physical address passed in is not in the map for the system */
61 printk("bad address: %lx\n", pa);
69 #define node_localnr(pfn, nid) ((pfn) - NODE_DATA(nid)->node_start_pfn)
72 * Following are macros that each numa implmentation must define.
75 #define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn)
76 #define node_end_pfn(nid) (NODE_DATA(nid)->node_end_pfn)
78 #ifdef CONFIG_DISCONTIGMEM
81 * Given a kernel address, find the home node of the underlying memory.
83 #define kvaddr_to_nid(kaddr) pa_to_nid(__pa(kaddr))
85 #define pfn_to_nid(pfn) pa_to_nid((unsigned long)(pfn) << PAGE_SHIFT)
87 /* Written this way to avoid evaluating arguments twice */
88 #define discontigmem_pfn_to_page(pfn) \
90 unsigned long __tmp = pfn; \
91 (NODE_DATA(pfn_to_nid(__tmp))->node_mem_map + \
92 node_localnr(__tmp, pfn_to_nid(__tmp))); \
95 #define discontigmem_page_to_pfn(p) \
97 struct page *__tmp = p; \
98 (((__tmp) - page_zone(__tmp)->zone_mem_map) + \
99 page_zone(__tmp)->zone_start_pfn); \
102 /* XXX fix for discontiguous physical memory */
103 #define discontigmem_pfn_valid(pfn) ((pfn) < num_physpages)
105 #endif /* CONFIG_DISCONTIGMEM */
107 #endif /* CONFIG_NEED_MULTIPLE_NODES */
109 #ifdef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
110 #define early_pfn_to_nid(pfn) pa_to_nid(((unsigned long)pfn) << PAGE_SHIFT)
113 #endif /* _ASM_MMZONE_H_ */