mmzone.h
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/* K8 NUMA support */
/* Copyright 2002,2003 by Andi Kleen, SuSE Labs */
/* 2.5 Version loosely based on the NUMAQ Code by Pat Gaughen. */
#ifndef _ASM_X86_64_MMZONE_H
#define _ASM_X86_64_MMZONE_H 1
#include <linux/config.h>
#ifdef CONFIG_DISCONTIGMEM
#define VIRTUAL_BUG_ON(x)
#include <asm/smp.h>
#define NODEMAPSIZE 0xff
/* Simple perfect hash to map physical addresses to node numbers */
extern int memnode_shift;
extern u8 memnodemap[NODEMAPSIZE];
extern int maxnode;
extern struct pglist_data *node_data[];
static inline __attribute__((pure)) int phys_to_nid(unsigned long addr)
{
int nid;
VIRTUAL_BUG_ON((addr >> memnode_shift) >= NODEMAPSIZE);
nid = memnodemap[addr >> memnode_shift];
VIRTUAL_BUG_ON(nid > maxnode);
return nid;
}
#define pfn_to_nid(pfn) phys_to_nid((unsigned long)(pfn) << PAGE_SHIFT)
#define kvaddr_to_nid(kaddr) phys_to_nid(__pa(kaddr))
#define NODE_DATA(nid) (node_data[nid])
#define node_mem_map(nid) (NODE_DATA(nid)->node_mem_map)
#define node_mem_map(nid) (NODE_DATA(nid)->node_mem_map)
#define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn)
#define node_end_pfn(nid) (NODE_DATA(nid)->node_start_pfn + \
NODE_DATA(nid)->node_spanned_pages)
#define local_mapnr(kvaddr) \
( (__pa(kvaddr) >> PAGE_SHIFT) - node_start_pfn(kvaddr_to_nid(kvaddr)) )
/* AK: this currently doesn't deal with invalid addresses. We'll see
if the 2.5 kernel doesn't pass them
(2.4 used to). */
#define pfn_to_page(pfn) ({ \
int nid = phys_to_nid(((unsigned long)(pfn)) << PAGE_SHIFT); \
((pfn) - node_start_pfn(nid)) + node_mem_map(nid); \
})
#define page_to_pfn(page) \
(long)(((page) - page_zone(page)->zone_mem_map) + page_zone(page)->zone_start_pfn)
#define pfn_valid(pfn) ((pfn) >= num_physpages ? 0 : \
({ u8 nid__ = pfn_to_nid(pfn); \
nid__ != 0xff && (pfn) >= node_start_pfn(nid__) && (pfn) <= node_end_pfn(nid__); }))
#endif
#endif