mmzone.h

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/*
 * Written by Pat Gaughen ([email protected]) 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 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_ */