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Linux kernel mirror (for testing)
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linux
1/*
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/* generic non-linear memory support:
14 *
15 * 1) we will not split memory into more chunks than will fit into the
16 * flags field of the struct page
17 */
18
19
20#ifdef CONFIG_NEED_MULTIPLE_NODES
21
22extern struct pglist_data *node_data[];
23/*
24 * Return a pointer to the node data for node n.
25 */
26#define NODE_DATA(nid) (node_data[nid])
27
28/*
29 * Following are specific to this numa platform.
30 */
31
32extern int numa_cpu_lookup_table[];
33extern char *numa_memory_lookup_table;
34extern cpumask_t numa_cpumask_lookup_table[];
35extern int nr_cpus_in_node[];
36
37/* 16MB regions */
38#define MEMORY_INCREMENT_SHIFT 24
39#define MEMORY_INCREMENT (1UL << MEMORY_INCREMENT_SHIFT)
40
41/* NUMA debugging, will not work on a DLPAR machine */
42#undef DEBUG_NUMA
43
44static inline int pa_to_nid(unsigned long pa)
45{
46 int nid;
47
48 nid = numa_memory_lookup_table[pa >> MEMORY_INCREMENT_SHIFT];
49
50#ifdef DEBUG_NUMA
51 /* the physical address passed in is not in the map for the system */
52 if (nid == -1) {
53 printk("bad address: %lx\n", pa);
54 BUG();
55 }
56#endif
57
58 return nid;
59}
60
61#define node_localnr(pfn, nid) ((pfn) - NODE_DATA(nid)->node_start_pfn)
62
63/*
64 * Following are macros that each numa implmentation must define.
65 */
66
67#define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn)
68#define node_end_pfn(nid) (NODE_DATA(nid)->node_end_pfn)
69
70#define local_mapnr(kvaddr) \
71 ( (__pa(kvaddr) >> PAGE_SHIFT) - node_start_pfn(kvaddr_to_nid(kvaddr))
72
73#ifdef CONFIG_DISCONTIGMEM
74
75/*
76 * Given a kernel address, find the home node of the underlying memory.
77 */
78#define kvaddr_to_nid(kaddr) pa_to_nid(__pa(kaddr))
79
80#define pfn_to_nid(pfn) pa_to_nid((unsigned long)(pfn) << PAGE_SHIFT)
81
82/* Written this way to avoid evaluating arguments twice */
83#define discontigmem_pfn_to_page(pfn) \
84({ \
85 unsigned long __tmp = pfn; \
86 (NODE_DATA(pfn_to_nid(__tmp))->node_mem_map + \
87 node_localnr(__tmp, pfn_to_nid(__tmp))); \
88})
89
90#define discontigmem_page_to_pfn(p) \
91({ \
92 struct page *__tmp = p; \
93 (((__tmp) - page_zone(__tmp)->zone_mem_map) + \
94 page_zone(__tmp)->zone_start_pfn); \
95})
96
97/* XXX fix for discontiguous physical memory */
98#define discontigmem_pfn_valid(pfn) ((pfn) < num_physpages)
99
100#endif /* CONFIG_DISCONTIGMEM */
101
102#endif /* CONFIG_NEED_MULTIPLE_NODES */
103
104#ifdef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
105#define early_pfn_to_nid(pfn) pa_to_nid(((unsigned long)pfn) << PAGE_SHIFT)
106#endif
107
108#endif /* _ASM_MMZONE_H_ */