[CONNECTOR]: Update documentation to match reality.
[linux-2.6/verdex.git] / include / asm-x86_64 / mmzone.h
blobb40c661f111e32b58f2c07bdd081a89fa4aa4b40
1 /* K8 NUMA support */
2 /* Copyright 2002,2003 by Andi Kleen, SuSE Labs */
3 /* 2.5 Version loosely based on the NUMAQ Code by Pat Gaughen. */
4 #ifndef _ASM_X86_64_MMZONE_H
5 #define _ASM_X86_64_MMZONE_H 1
7 #include <linux/config.h>
9 #ifdef CONFIG_NUMA
11 #define VIRTUAL_BUG_ON(x)
13 #include <asm/smp.h>
15 #define NODEMAPSIZE 0xfff
17 /* Simple perfect hash to map physical addresses to node numbers */
18 extern int memnode_shift;
19 extern u8 memnodemap[NODEMAPSIZE];
20 extern int maxnode;
22 extern struct pglist_data *node_data[];
24 static inline __attribute__((pure)) int phys_to_nid(unsigned long addr)
26 int nid;
27 VIRTUAL_BUG_ON((addr >> memnode_shift) >= NODEMAPSIZE);
28 nid = memnodemap[addr >> memnode_shift];
29 VIRTUAL_BUG_ON(nid > maxnode);
30 return nid;
33 #define NODE_DATA(nid) (node_data[nid])
35 #define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn)
36 #define node_end_pfn(nid) (NODE_DATA(nid)->node_start_pfn + \
37 NODE_DATA(nid)->node_spanned_pages)
39 #ifdef CONFIG_DISCONTIGMEM
41 #define pfn_to_nid(pfn) phys_to_nid((unsigned long)(pfn) << PAGE_SHIFT)
42 #define kvaddr_to_nid(kaddr) phys_to_nid(__pa(kaddr))
44 /* AK: this currently doesn't deal with invalid addresses. We'll see
45 if the 2.5 kernel doesn't pass them
46 (2.4 used to). */
47 #define pfn_to_page(pfn) ({ \
48 int nid = phys_to_nid(((unsigned long)(pfn)) << PAGE_SHIFT); \
49 ((pfn) - node_start_pfn(nid)) + NODE_DATA(nid)->node_mem_map; \
52 #define page_to_pfn(page) \
53 (long)(((page) - page_zone(page)->zone_mem_map) + page_zone(page)->zone_start_pfn)
55 #define pfn_valid(pfn) ((pfn) >= num_physpages ? 0 : \
56 ({ u8 nid__ = pfn_to_nid(pfn); \
57 nid__ != 0xff && (pfn) >= node_start_pfn(nid__) && (pfn) < node_end_pfn(nid__); }))
58 #endif
60 #define local_mapnr(kvaddr) \
61 ( (__pa(kvaddr) >> PAGE_SHIFT) - node_start_pfn(kvaddr_to_nid(kvaddr)) )
62 #endif
63 #endif