xen: cleancache shim to Xen Transcendent Memory
[linux-2.6/next.git] / arch / x86 / include / asm / mmzone_32.h
blob91df7c51806cefc0820dbf13a49be0b51136676e
1 /*
2 * Written by Pat Gaughen (gone@us.ibm.com) Mar 2002
4 */
6 #ifndef _ASM_X86_MMZONE_32_H
7 #define _ASM_X86_MMZONE_32_H
9 #include <asm/smp.h>
11 #ifdef CONFIG_NUMA
12 extern struct pglist_data *node_data[];
13 #define NODE_DATA(nid) (node_data[nid])
15 #include <asm/numaq.h>
16 /* summit or generic arch */
17 #include <asm/srat.h>
19 extern int get_memcfg_numa_flat(void);
21 * This allows any one NUMA architecture to be compiled
22 * for, and still fall back to the flat function if it
23 * fails.
25 static inline void get_memcfg_numa(void)
28 if (get_memcfg_numaq())
29 return;
30 if (get_memcfg_from_srat())
31 return;
32 get_memcfg_numa_flat();
35 extern void resume_map_numa_kva(pgd_t *pgd);
37 #else /* !CONFIG_NUMA */
39 #define get_memcfg_numa get_memcfg_numa_flat
41 static inline void resume_map_numa_kva(pgd_t *pgd) {}
43 #endif /* CONFIG_NUMA */
45 #ifdef CONFIG_DISCONTIGMEM
48 * generic node memory support, the following assumptions apply:
50 * 1) memory comes in 64Mb contiguous chunks which are either present or not
51 * 2) we will not have more than 64Gb in total
53 * for now assume that 64Gb is max amount of RAM for whole system
54 * 64Gb / 4096bytes/page = 16777216 pages
56 #define MAX_NR_PAGES 16777216
57 #define MAX_ELEMENTS 1024
58 #define PAGES_PER_ELEMENT (MAX_NR_PAGES/MAX_ELEMENTS)
60 extern s8 physnode_map[];
62 static inline int pfn_to_nid(unsigned long pfn)
64 #ifdef CONFIG_NUMA
65 return((int) physnode_map[(pfn) / PAGES_PER_ELEMENT]);
66 #else
67 return 0;
68 #endif
72 * Following are macros that each numa implmentation must define.
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; \
82 static inline int pfn_valid(int pfn)
84 int nid = pfn_to_nid(pfn);
86 if (nid >= 0)
87 return (pfn < node_end_pfn(nid));
88 return 0;
91 #endif /* CONFIG_DISCONTIGMEM */
93 #ifdef CONFIG_NEED_MULTIPLE_NODES
94 /* always use node 0 for bootmem on this numa platform */
95 #define bootmem_arch_preferred_node(__bdata, size, align, goal, limit) \
96 (NODE_DATA(0)->bdata)
97 #endif /* CONFIG_NEED_MULTIPLE_NODES */
99 #endif /* _ASM_X86_MMZONE_32_H */