1#ifndef _PARISC_MMZONE_H
2#define _PARISC_MMZONE_H
3
4#define MAX_PHYSMEM_RANGES 8 /* Fix the size for now (current known max is 3) */
5
6#ifdef CONFIG_DISCONTIGMEM
7
8extern int npmem_ranges;
9
10struct node_map_data {
11    pg_data_t pg_data;
12};
13
14extern struct node_map_data node_data[];
15
16#define NODE_DATA(nid)          (&node_data[nid].pg_data)
17
18/* We have these possible memory map layouts:
19 * Astro: 0-3.75, 67.75-68, 4-64
20 * zx1: 0-1, 257-260, 4-256
21 * Stretch (N-class): 0-2, 4-32, 34-xxx
22 */
23
24/* Since each 1GB can only belong to one region (node), we can create
25 * an index table for pfn to nid lookup; each entry in pfnnid_map
26 * represents 1GB, and contains the node that the memory belongs to. */
27
28#define PFNNID_SHIFT (30 - PAGE_SHIFT)
29#define PFNNID_MAP_MAX  512     /* support 512GB */
30extern signed char pfnnid_map[PFNNID_MAP_MAX];
31
32#ifndef CONFIG_64BIT
33#define pfn_is_io(pfn) ((pfn & (0xf0000000UL >> PAGE_SHIFT)) == (0xf0000000UL >> PAGE_SHIFT))
34#else
35/* io can be 0xf0f0f0f0f0xxxxxx or 0xfffffffff0000000 */
36#define pfn_is_io(pfn) ((pfn & (0xf000000000000000UL >> PAGE_SHIFT)) == (0xf000000000000000UL >> PAGE_SHIFT))
37#endif
38
39static inline int pfn_to_nid(unsigned long pfn)
40{
41	unsigned int i;
42
43	if (unlikely(pfn_is_io(pfn)))
44		return 0;
45
46	i = pfn >> PFNNID_SHIFT;
47	BUG_ON(i >= ARRAY_SIZE(pfnnid_map));
48
49	return pfnnid_map[i];
50}
51
52static inline int pfn_valid(int pfn)
53{
54	int nid = pfn_to_nid(pfn);
55
56	if (nid >= 0)
57		return (pfn < node_end_pfn(nid));
58	return 0;
59}
60
61#endif
62#endif /* _PARISC_MMZONE_H */
63