mmzone.h 2.23 KB
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/*
 * Written by Kanoj Sarcar (kanoj@sgi.com) Aug 99
 *
 * PowerPC64 port:
 * Copyright (C) 2002 Anton Blanchard, IBM Corp.
 */
#ifndef _ASM_MMZONE_H_
#define _ASM_MMZONE_H_

#include <linux/config.h>
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#include <asm/smp.h>
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#ifdef CONFIG_DISCONTIGMEM

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extern struct pglist_data node_data[];
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/*
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 * Following are specific to this numa platform.
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 */

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extern int numa_cpu_lookup_table[];
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extern char *numa_memory_lookup_table;
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extern cpumask_t numa_cpumask_lookup_table[];
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extern int nr_cpus_in_node[];
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#define MAX_MEMORY (1UL << 41)
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/* 16MB regions */
#define MEMORY_INCREMENT_SHIFT 24
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#define MEMORY_INCREMENT (1UL << MEMORY_INCREMENT_SHIFT)
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/* NUMA debugging, will not work on a DLPAR machine */
#undef DEBUG_NUMA
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static inline int pa_to_nid(unsigned long pa)
{
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	int nid;
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	nid = numa_memory_lookup_table[pa >> MEMORY_INCREMENT_SHIFT];
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#ifdef DEBUG_NUMA
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	/* the physical address passed in is not in the map for the system */
	if (nid == -1) {
		printk("bad address: %lx\n", pa);
		BUG();
	}
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#endif

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	return nid;
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}

#define pfn_to_nid(pfn)		pa_to_nid((pfn) << PAGE_SHIFT)

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/*
 * Return a pointer to the node data for node n.
 */
#define NODE_DATA(nid)		(&node_data[nid])

#define node_localnr(pfn, nid)	((pfn) - NODE_DATA(nid)->node_start_pfn)
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/*
 * Following are macros that each numa implmentation must define.
 */

/*
 * Given a kernel address, find the home node of the underlying memory.
 */
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#define kvaddr_to_nid(kaddr)	pa_to_nid(__pa(kaddr))
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#define node_mem_map(nid)	(NODE_DATA(nid)->node_mem_map)
#define node_start_pfn(nid)	(NODE_DATA(nid)->node_start_pfn)
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#define node_end_pfn(nid)	(NODE_DATA(nid)->node_end_pfn)
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#define local_mapnr(kvaddr) \
	( (__pa(kvaddr) >> PAGE_SHIFT) - node_start_pfn(kvaddr_to_nid(kvaddr)) 
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/* Written this way to avoid evaluating arguments twice */
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#define discontigmem_pfn_to_page(pfn) \
({ \
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	unsigned long __tmp = pfn; \
	(node_mem_map(pfn_to_nid(__tmp)) + \
	 node_localnr(__tmp, pfn_to_nid(__tmp))); \
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})

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#define discontigmem_page_to_pfn(p) \
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({ \
	struct page *__tmp = p; \
	(((__tmp) - page_zone(__tmp)->zone_mem_map) + \
	 page_zone(__tmp)->zone_start_pfn); \
})
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/* XXX fix for discontiguous physical memory */
#define discontigmem_pfn_valid(pfn)		((pfn) < num_physpages)

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#endif /* CONFIG_DISCONTIGMEM */
#endif /* _ASM_MMZONE_H_ */