1#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#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})
23
24
25/* Since each 1GB can only belong to one region (node), we can create
26 * an index table for pfn to nid lookup; each entry in pfnnid_map
27 * represents 1GB, and contains the node that the memory belongs to. */
28
29#define PFNNID_SHIFT (30 - PAGE_SHIFT)
30#define PFNNID_MAP_MAX  512     /* support 512GB */
31extern unsigned char pfnnid_map[PFNNID_MAP_MAX];
32
33#ifndef CONFIG_64BIT
34#define pfn_is_io(pfn) ((pfn & (0xf0000000UL >> PAGE_SHIFT)) == (0xf0000000UL >> PAGE_SHIFT))
35#else
36/* io can be 0xf0f0f0f0f0xxxxxx or 0xfffffffff0000000 */
37#define pfn_is_io(pfn) ((pfn & (0xf000000000000000UL >> PAGE_SHIFT)) == (0xf000000000000000UL >> PAGE_SHIFT))
38#endif
39
40static inline int pfn_to_nid(unsigned long pfn)
41{
42	unsigned int i;
43	unsigned char r;
44
45	if (unlikely(pfn_is_io(pfn)))
46		return 0;
47
48	i = pfn >> PFNNID_SHIFT;
49	BUG_ON(i >= sizeof(pfnnid_map) / sizeof(pfnnid_map[0]));
50	r = pfnnid_map[i];
51	BUG_ON(r == 0xff);
52
53	return (int)r;
54}
55
56static inline int pfn_valid(int pfn)
57{
58	int nid = pfn_to_nid(pfn);
59
60	if (nid >= 0)
61		return (pfn < node_end_pfn(nid));
62	return 0;
63}
64
65#else /* !CONFIG_DISCONTIGMEM */
66#define MAX_PHYSMEM_RANGES 	1
67#endif
68#endif /* _PARISC_MMZONE_H */
69