tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/*
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
22#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})
28#define node_localnr(pfn, nid) ((pfn) - node_start_pfn(nid))
29
30#define local_mapnr(kvaddr) \
31({ \
32 unsigned long __pfn = __pa(kvaddr) >> PAGE_SHIFT; \
33 (__pfn - node_start_pfn(pfn_to_nid(__pfn))); \
34})
35
36#define pfn_to_page(pfn) \
37({ \
38 unsigned long __pfn = (pfn); \
39 int __node = pfn_to_nid(__pfn); \
40 &NODE_DATA(__node)->node_mem_map[node_localnr(__pfn,__node)]; \
41})
42
43#define page_to_pfn(pg) \
44({ \
45 struct page *__page = pg; \
46 struct zone *__zone = page_zone(__page); \
47 BUG_ON(__zone == NULL); \
48 (unsigned long)(__page - __zone->zone_mem_map) \
49 + __zone->zone_start_pfn; \
50})
51
52/* We have these possible memory map layouts:
53 * Astro: 0-3.75, 67.75-68, 4-64
54 * zx1: 0-1, 257-260, 4-256
55 * Stretch (N-class): 0-2, 4-32, 34-xxx
56 */
57
58/* Since each 1GB can only belong to one region (node), we can create
59 * an index table for pfn to nid lookup; each entry in pfnnid_map
60 * represents 1GB, and contains the node that the memory belongs to. */
61
62#define PFNNID_SHIFT (30 - PAGE_SHIFT)
63#define PFNNID_MAP_MAX 512 /* support 512GB */
64extern unsigned char pfnnid_map[PFNNID_MAP_MAX];
65
66#ifndef __LP64__
67#define pfn_is_io(pfn) ((pfn & (0xf0000000UL >> PAGE_SHIFT)) == (0xf0000000UL >> PAGE_SHIFT))
68#else
69/* io can be 0xf0f0f0f0f0xxxxxx or 0xfffffffff0000000 */
70#define pfn_is_io(pfn) ((pfn & (0xf000000000000000UL >> PAGE_SHIFT)) == (0xf000000000000000UL >> PAGE_SHIFT))
71#endif
72
73static inline int pfn_to_nid(unsigned long pfn)
74{
75 unsigned int i;
76 unsigned char r;
77
78 if (unlikely(pfn_is_io(pfn)))
79 return 0;
80
81 i = pfn >> PFNNID_SHIFT;
82 BUG_ON(i >= sizeof(pfnnid_map) / sizeof(pfnnid_map[0]));
83 r = pfnnid_map[i];
84 BUG_ON(r == 0xff);
85
86 return (int)r;
87}
88
89static inline int pfn_valid(int pfn)
90{
91 int nid = pfn_to_nid(pfn);
92
93 if (nid >= 0)
94 return (pfn < node_end_pfn(nid));
95 return 0;
96}
97
98#else /* !CONFIG_DISCONTIGMEM */
99#define MAX_PHYSMEM_RANGES 1
100#endif
101#endif /* _PARISC_MMZONE_H */