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/*
* Written by Pat Gaughen (gone@us.ibm.com) Mar 2002
*
*/
#ifndef _ASM_MMZONE_H_
#define _ASM_MMZONE_H_
#include <asm/smp.h>
#ifdef CONFIG_DISCONTIGMEM
extern struct pglist_data *node_data[];
#define NODE_DATA(nid) (node_data[nid])
#define node_localnr(pfn, nid) ((pfn) - NODE_DATA(nid)->node_start_pfn)
#define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn)
#define node_end_pfn(nid) \
({ \
pg_data_t *__pgdat = NODE_DATA(nid); \
__pgdat->node_start_pfn + __pgdat->node_spanned_pages - 1; \
})
#define pfn_to_page(pfn) \
({ \
unsigned long __pfn = pfn; \
int __node = pfn_to_nid(__pfn); \
&NODE_DATA(__node)->node_mem_map[node_localnr(__pfn,__node)]; \
})
#define page_to_pfn(pg) \
({ \
struct page *__page = pg; \
struct zone *__zone = page_zone(__page); \
(unsigned long)(__page - __zone->zone_mem_map) \
+ __zone->zone_start_pfn; \
})
#define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
/*
* pfn_valid should be made as fast as possible, and the current definition
* is valid for machines that are NUMA, but still contiguous, which is what
* is currently supported. A more generalised, but slower definition would
* be something like this - mbligh:
* ( pfn_to_pgdat(pfn) && ((pfn) < node_end_pfn(pfn_to_nid(pfn))) )
*/
#if 1 /* M32R_FIXME */
#define pfn_valid(pfn) (1)
#else
#define pfn_valid(pfn) ((pfn) < num_physpages)
#endif
/*
* generic node memory support, the following assumptions apply:
*/
static __inline__ int pfn_to_nid(unsigned long pfn)
{
int node;
for (node = 0 ; node < MAX_NUMNODES ; node++)
if (pfn >= node_start_pfn(node) && pfn <= node_end_pfn(node))
break;
return node;
}
static __inline__ struct pglist_data *pfn_to_pgdat(unsigned long pfn)
{
return(NODE_DATA(pfn_to_nid(pfn)));
}
#endif /* CONFIG_DISCONTIGMEM */
#endif /* _ASM_MMZONE_H_ */
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