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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _PARISC_MMZONE_H
2#define _PARISC_MMZONE_H
3
4#ifdef CONFIG_DISCONTIGMEM
5
6#define MAX_PHYSMEM_RANGES 8 /* Fix the size for now (current known max is 3) */
7extern int npmem_ranges;
8
9struct node_map_data {
10 pg_data_t pg_data;
11};
12
13extern struct node_map_data node_data[];
14
15#define NODE_DATA(nid) (&node_data[nid].pg_data)
16
17/*
18 * Given a kernel address, find the home node of the underlying memory.
19 */
20#define kvaddr_to_nid(kaddr) pfn_to_nid(__pa(kaddr) >> PAGE_SHIFT)
21
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn)
23#define node_end_pfn(nid) \
24({ \
25 pg_data_t *__pgdat = NODE_DATA(nid); \
26 __pgdat->node_start_pfn + __pgdat->node_spanned_pages; \
27})
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
29/* We have these possible memory map layouts:
30 * Astro: 0-3.75, 67.75-68, 4-64
31 * zx1: 0-1, 257-260, 4-256
32 * Stretch (N-class): 0-2, 4-32, 34-xxx
33 */
34
35/* Since each 1GB can only belong to one region (node), we can create
36 * an index table for pfn to nid lookup; each entry in pfnnid_map
37 * represents 1GB, and contains the node that the memory belongs to. */
38
39#define PFNNID_SHIFT (30 - PAGE_SHIFT)
40#define PFNNID_MAP_MAX 512 /* support 512GB */
41extern unsigned char pfnnid_map[PFNNID_MAP_MAX];
42
43#ifndef __LP64__
44#define pfn_is_io(pfn) ((pfn & (0xf0000000UL >> PAGE_SHIFT)) == (0xf0000000UL >> PAGE_SHIFT))
45#else
46/* io can be 0xf0f0f0f0f0xxxxxx or 0xfffffffff0000000 */
47#define pfn_is_io(pfn) ((pfn & (0xf000000000000000UL >> PAGE_SHIFT)) == (0xf000000000000000UL >> PAGE_SHIFT))
48#endif
49
50static inline int pfn_to_nid(unsigned long pfn)
51{
52 unsigned int i;
53 unsigned char r;
54
55 if (unlikely(pfn_is_io(pfn)))
56 return 0;
57
58 i = pfn >> PFNNID_SHIFT;
59 BUG_ON(i >= sizeof(pfnnid_map) / sizeof(pfnnid_map[0]));
60 r = pfnnid_map[i];
61 BUG_ON(r == 0xff);
62
63 return (int)r;
64}
65
66static inline int pfn_valid(int pfn)
67{
68 int nid = pfn_to_nid(pfn);
69
70 if (nid >= 0)
71 return (pfn < node_end_pfn(nid));
72 return 0;
73}
74
75#else /* !CONFIG_DISCONTIGMEM */
76#define MAX_PHYSMEM_RANGES 1
77#endif
78#endif /* _PARISC_MMZONE_H */