[PATCH] mips: add MIPS-specific support for flatmem/discontigmem
[linux-2.6.git] / include / asm-mips / mmzone.h
1 /*
2  * Written by Kanoj Sarcar (kanoj@sgi.com) Aug 99
3  * Rewritten for Linux 2.6 by Christoph Hellwig (hch@lst.de) Jan 2004
4  */
5 #ifndef _ASM_MMZONE_H_
6 #define _ASM_MMZONE_H_
7
8 #include <asm/page.h>
9 #include <mmzone.h>
10
11 #ifdef CONFIG_DISCONTIGMEM
12
13 #define kvaddr_to_nid(kvaddr)   pa_to_nid(__pa(kvaddr))
14 #define pfn_to_nid(pfn)         pa_to_nid((pfn) << PAGE_SHIFT)
15
16 #define pfn_valid(pfn)                                          \
17 ({                                                              \
18         unsigned long __pfn = (pfn);                            \
19         int __n = pfn_to_nid(__pfn);                            \
20         ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \
21                        NODE_DATA(__n)->node_spanned_pages) : 0);\
22 })
23
24 #define pfn_to_page(pfn)                                        \
25 ({                                                              \
26         unsigned long __pfn = (pfn);                            \
27         pg_data_t *__pg = NODE_DATA(pfn_to_nid(__pfn));         \
28         __pg->node_mem_map + (__pfn - __pg->node_start_pfn);    \
29 })
30
31 #define page_to_pfn(p)                                          \
32 ({                                                              \
33         struct page *__p = (p);                                 \
34         struct zone *__z = page_zone(__p);                      \
35         ((__p - __z->zone_mem_map) + __z->zone_start_pfn);      \
36 })
37
38 /* XXX: FIXME -- wli */
39 #define kern_addr_valid(addr)   (0)
40
41 #endif /* CONFIG_DISCONTIGMEM */
42
43 #endif /* _ASM_MMZONE_H_ */