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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>
#include <asm/smp.h>
/* generic non-linear memory support:
*
* 1) we will not split memory into more chunks than will fit into the
* flags field of the struct page
*/
#ifdef CONFIG_NEED_MULTIPLE_NODES
extern struct pglist_data *node_data[];
/*
* Return a pointer to the node data for node n.
*/
#define NODE_DATA(nid) (node_data[nid])
/*
* Following are specific to this numa platform.
*/
extern int numa_cpu_lookup_table[];
extern char *numa_memory_lookup_table;
extern cpumask_t numa_cpumask_lookup_table[];
extern int nr_cpus_in_node[];
#ifdef CONFIG_MEMORY_HOTPLUG
extern unsigned long max_pfn;
#endif
/* 16MB regions */
#define MEMORY_INCREMENT_SHIFT 24
#define MEMORY_INCREMENT (1UL << MEMORY_INCREMENT_SHIFT)
/* NUMA debugging, will not work on a DLPAR machine */
#undef DEBUG_NUMA
static inline int pa_to_nid(unsigned long pa)
{
int nid;
#ifdef CONFIG_MEMORY_HOTPLUG
/* kludge hot added sections default to node 0 */
if (pa >= (max_pfn << PAGE_SHIFT))
return 0;
#endif
nid = numa_memory_lookup_table[pa >> MEMORY_INCREMENT_SHIFT];
#ifdef DEBUG_NUMA
/* the physical address passed in is not in the map for the system */
if (nid == -1) {
printk("bad address: %lx\n", pa);
BUG();
}
#endif
return nid;
}
/*
* Following are macros that each numa implmentation must define.
*/
#define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn)
#define node_end_pfn(nid) (NODE_DATA(nid)->node_end_pfn)
#ifdef CONFIG_DISCONTIGMEM
#define node_localnr(pfn, nid) ((pfn) - NODE_DATA(nid)->node_start_pfn)
#define pfn_to_nid(pfn) pa_to_nid((unsigned long)(pfn) << PAGE_SHIFT)
/* Written this way to avoid evaluating arguments twice */
#define discontigmem_pfn_to_page(pfn) \
({ \
unsigned long __tmp = pfn; \
(NODE_DATA(pfn_to_nid(__tmp))->node_mem_map + \
node_localnr(__tmp, pfn_to_nid(__tmp))); \
})
#define discontigmem_page_to_pfn(p) \
({ \
struct page *__tmp = p; \
(((__tmp) - page_zone(__tmp)->zone_mem_map) + \
page_zone(__tmp)->zone_start_pfn); \
})
/* XXX fix for discontiguous physical memory */
#define discontigmem_pfn_valid(pfn) ((pfn) < num_physpages)
#endif /* CONFIG_DISCONTIGMEM */
#endif /* CONFIG_NEED_MULTIPLE_NODES */
#ifdef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
#define early_pfn_to_nid(pfn) pa_to_nid(((unsigned long)pfn) << PAGE_SHIFT)
#endif
#endif /* _ASM_MMZONE_H_ */
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