blob: c87813662d4da83d80d78dc8cb65a7fd43a64822 [file] [log] [blame]
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn)
18#define node_end_pfn(nid) \
19({ \
20 pg_data_t *__pgdat = NODE_DATA(nid); \
21 __pgdat->node_start_pfn + __pgdat->node_spanned_pages; \
22})
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
24/* We have these possible memory map layouts:
25 * Astro: 0-3.75, 67.75-68, 4-64
26 * zx1: 0-1, 257-260, 4-256
27 * Stretch (N-class): 0-2, 4-32, 34-xxx
28 */
29
30/* Since each 1GB can only belong to one region (node), we can create
31 * an index table for pfn to nid lookup; each entry in pfnnid_map
32 * represents 1GB, and contains the node that the memory belongs to. */
33
34#define PFNNID_SHIFT (30 - PAGE_SHIFT)
35#define PFNNID_MAP_MAX 512 /* support 512GB */
36extern unsigned char pfnnid_map[PFNNID_MAP_MAX];
37
38#ifndef __LP64__
39#define pfn_is_io(pfn) ((pfn & (0xf0000000UL >> PAGE_SHIFT)) == (0xf0000000UL >> PAGE_SHIFT))
40#else
41/* io can be 0xf0f0f0f0f0xxxxxx or 0xfffffffff0000000 */
42#define pfn_is_io(pfn) ((pfn & (0xf000000000000000UL >> PAGE_SHIFT)) == (0xf000000000000000UL >> PAGE_SHIFT))
43#endif
44
45static inline int pfn_to_nid(unsigned long pfn)
46{
47 unsigned int i;
48 unsigned char r;
49
50 if (unlikely(pfn_is_io(pfn)))
51 return 0;
52
53 i = pfn >> PFNNID_SHIFT;
54 BUG_ON(i >= sizeof(pfnnid_map) / sizeof(pfnnid_map[0]));
55 r = pfnnid_map[i];
56 BUG_ON(r == 0xff);
57
58 return (int)r;
59}
60
61static inline int pfn_valid(int pfn)
62{
63 int nid = pfn_to_nid(pfn);
64
65 if (nid >= 0)
66 return (pfn < node_end_pfn(nid));
67 return 0;
68}
69
70#else /* !CONFIG_DISCONTIGMEM */
71#define MAX_PHYSMEM_RANGES 1
72#endif
73#endif /* _PARISC_MMZONE_H */