1 /*
2 * Written by Pat Gaughen (gone@us.ibm.com) Mar 2002
3 *
4 */
5
6 #ifndef _ASM_X86_MMZONE_32_H
7 #define _ASM_X86_MMZONE_32_H
8
9 #include <asm/smp.h>
10
11 #ifdef CONFIG_NUMA
12 extern struct pglist_data *node_data[];
13 #define NODE_DATA(nid) (node_data[nid])
14
15 #include <asm/numaq.h>
16 /* summit or generic arch */
17 #include <asm/srat.h>
18
19 extern int get_memcfg_numa_flat(void);
20 /*
21 * This allows any one NUMA architecture to be compiled
22 * for, and still fall back to the flat function if it
23 * fails.
24 */
get_memcfg_numa(void)25 static inline void get_memcfg_numa(void)
26 {
27
28 if (get_memcfg_numaq())
29 return;
30 if (get_memcfg_from_srat())
31 return;
32 get_memcfg_numa_flat();
33 }
34
35 extern void resume_map_numa_kva(pgd_t *pgd);
36
37 #else /* !CONFIG_NUMA */
38
39 #define get_memcfg_numa get_memcfg_numa_flat
40
resume_map_numa_kva(pgd_t * pgd)41 static inline void resume_map_numa_kva(pgd_t *pgd) {}
42
43 #endif /* CONFIG_NUMA */
44
45 #ifdef CONFIG_DISCONTIGMEM
46
47 /*
48 * generic node memory support, the following assumptions apply:
49 *
50 * 1) memory comes in 64Mb contigious chunks which are either present or not
51 * 2) we will not have more than 64Gb in total
52 *
53 * for now assume that 64Gb is max amount of RAM for whole system
54 * 64Gb / 4096bytes/page = 16777216 pages
55 */
56 #define MAX_NR_PAGES 16777216
57 #define MAX_ELEMENTS 1024
58 #define PAGES_PER_ELEMENT (MAX_NR_PAGES/MAX_ELEMENTS)
59
60 extern s8 physnode_map[];
61
pfn_to_nid(unsigned long pfn)62 static inline int pfn_to_nid(unsigned long pfn)
63 {
64 #ifdef CONFIG_NUMA
65 return((int) physnode_map[(pfn) / PAGES_PER_ELEMENT]);
66 #else
67 return 0;
68 #endif
69 }
70
71 /*
72 * Following are macros that each numa implmentation must define.
73 */
74
75 #define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn)
76 #define node_end_pfn(nid) \
77 ({ \
78 pg_data_t *__pgdat = NODE_DATA(nid); \
79 __pgdat->node_start_pfn + __pgdat->node_spanned_pages; \
80 })
81
pfn_valid(int pfn)82 static inline int pfn_valid(int pfn)
83 {
84 int nid = pfn_to_nid(pfn);
85
86 if (nid >= 0)
87 return (pfn < node_end_pfn(nid));
88 return 0;
89 }
90
91 #endif /* CONFIG_DISCONTIGMEM */
92
93 #ifdef CONFIG_NEED_MULTIPLE_NODES
94
95 /*
96 * Following are macros that are specific to this numa platform.
97 */
98 #define reserve_bootmem(addr, size, flags) \
99 reserve_bootmem_node(NODE_DATA(0), (addr), (size), (flags))
100 #define alloc_bootmem(x) \
101 __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
102 #define alloc_bootmem_nopanic(x) \
103 __alloc_bootmem_node_nopanic(NODE_DATA(0), (x), SMP_CACHE_BYTES, \
104 __pa(MAX_DMA_ADDRESS))
105 #define alloc_bootmem_low(x) \
106 __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, 0)
107 #define alloc_bootmem_pages(x) \
108 __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
109 #define alloc_bootmem_pages_nopanic(x) \
110 __alloc_bootmem_node_nopanic(NODE_DATA(0), (x), PAGE_SIZE, \
111 __pa(MAX_DMA_ADDRESS))
112 #define alloc_bootmem_low_pages(x) \
113 __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, 0)
114 #define alloc_bootmem_node(pgdat, x) \
115 ({ \
116 struct pglist_data __maybe_unused \
117 *__alloc_bootmem_node__pgdat = (pgdat); \
118 __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, \
119 __pa(MAX_DMA_ADDRESS)); \
120 })
121 #define alloc_bootmem_pages_node(pgdat, x) \
122 ({ \
123 struct pglist_data __maybe_unused \
124 *__alloc_bootmem_node__pgdat = (pgdat); \
125 __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, \
126 __pa(MAX_DMA_ADDRESS)); \
127 })
128 #define alloc_bootmem_low_pages_node(pgdat, x) \
129 ({ \
130 struct pglist_data __maybe_unused \
131 *__alloc_bootmem_node__pgdat = (pgdat); \
132 __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, 0); \
133 })
134 #endif /* CONFIG_NEED_MULTIPLE_NODES */
135
136 #endif /* _ASM_X86_MMZONE_32_H */
137