mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-19 02:04:19 +08:00
60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
/*
|
|
* 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 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_ */
|