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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Written by Kanoj Sarcar (kanoj@sgi.com) Aug 99
3 *
4 * PowerPC64 port:
5 * Copyright (C) 2002 Anton Blanchard, IBM Corp.
6 */
7#ifndef _ASM_MMZONE_H_
8#define _ASM_MMZONE_H_
9
10#include <linux/config.h>
11#include <asm/smp.h>
12
13#ifdef CONFIG_DISCONTIGMEM
14
15extern struct pglist_data *node_data[];
16
17/*
18 * Following are specific to this numa platform.
19 */
20
21extern int numa_cpu_lookup_table[];
22extern char *numa_memory_lookup_table;
23extern cpumask_t numa_cpumask_lookup_table[];
24extern int nr_cpus_in_node[];
25
26/* 16MB regions */
27#define MEMORY_INCREMENT_SHIFT 24
28#define MEMORY_INCREMENT (1UL << MEMORY_INCREMENT_SHIFT)
29
30/* NUMA debugging, will not work on a DLPAR machine */
31#undef DEBUG_NUMA
32
33static inline int pa_to_nid(unsigned long pa)
34{
35 int nid;
36
37 nid = numa_memory_lookup_table[pa >> MEMORY_INCREMENT_SHIFT];
38
39#ifdef DEBUG_NUMA
40 /* the physical address passed in is not in the map for the system */
41 if (nid == -1) {
42 printk("bad address: %lx\n", pa);
43 BUG();
44 }
45#endif
46
47 return nid;
48}
49
50#define pfn_to_nid(pfn) pa_to_nid((pfn) << PAGE_SHIFT)
51
52/*
53 * Return a pointer to the node data for node n.
54 */
55#define NODE_DATA(nid) (node_data[nid])
56
57#define node_localnr(pfn, nid) ((pfn) - NODE_DATA(nid)->node_start_pfn)
58
59/*
60 * Following are macros that each numa implmentation must define.
61 */
62
63/*
64 * Given a kernel address, find the home node of the underlying memory.
65 */
66#define kvaddr_to_nid(kaddr) pa_to_nid(__pa(kaddr))
67
68#define node_mem_map(nid) (NODE_DATA(nid)->node_mem_map)
69#define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn)
70#define node_end_pfn(nid) (NODE_DATA(nid)->node_end_pfn)
71
72#define local_mapnr(kvaddr) \
73 ( (__pa(kvaddr) >> PAGE_SHIFT) - node_start_pfn(kvaddr_to_nid(kvaddr))
74
75/* Written this way to avoid evaluating arguments twice */
76#define discontigmem_pfn_to_page(pfn) \
77({ \
78 unsigned long __tmp = pfn; \
79 (node_mem_map(pfn_to_nid(__tmp)) + \
80 node_localnr(__tmp, pfn_to_nid(__tmp))); \
81})
82
83#define discontigmem_page_to_pfn(p) \
84({ \
85 struct page *__tmp = p; \
86 (((__tmp) - page_zone(__tmp)->zone_mem_map) + \
87 page_zone(__tmp)->zone_start_pfn); \
88})
89
90/* XXX fix for discontiguous physical memory */
91#define discontigmem_pfn_valid(pfn) ((pfn) < num_physpages)
92
93#endif /* CONFIG_DISCONTIGMEM */
94#endif /* _ASM_MMZONE_H_ */