root/include/asm-x86/mmzone_32.h

INCLUDED FROM

DEFINITIONS

1. get_memcfg_numa
2. pfn_to_nid
3. pfn_valid

/*
 * Written by Pat Gaughen (gone@us.ibm.com) Mar 2002
 *
 */

#ifndef ASM_X86__MMZONE_32_H
#define ASM_X86__MMZONE_32_H

#include <asm/smp.h>

#ifdef CONFIG_NUMA
extern struct pglist_data *node_data[];
#define NODE_DATA(nid)  (node_data[nid])

#include <asm/numaq.h>
/* summit or generic arch */
#include <asm/srat.h>

extern int get_memcfg_numa_flat(void);
/*
 * This allows any one NUMA architecture to be compiled
 * for, and still fall back to the flat function if it
 * fails.
 */
static inline void get_memcfg_numa(void)
{

        if (get_memcfg_numaq())
                return;
        if (get_memcfg_from_srat())
                return;
        get_memcfg_numa_flat();
}

extern int early_pfn_to_nid(unsigned long pfn);

#else /* !CONFIG_NUMA */

#define get_memcfg_numa get_memcfg_numa_flat

#endif /* CONFIG_NUMA */

#ifdef CONFIG_DISCONTIGMEM

/*
 * generic node memory support, the following assumptions apply:
 *
 * 1) memory comes in 64Mb contigious chunks which are either present or not
 * 2) we will not have more than 64Gb in total
 *
 * for now assume that 64Gb is max amount of RAM for whole system
 *    64Gb / 4096bytes/page = 16777216 pages
 */
#define MAX_NR_PAGES 16777216
#define MAX_ELEMENTS 1024
#define PAGES_PER_ELEMENT (MAX_NR_PAGES/MAX_ELEMENTS)

extern s8 physnode_map[];

static inline int pfn_to_nid(unsigned long pfn)
{
#ifdef CONFIG_NUMA
        return((int) physnode_map[(pfn) / PAGES_PER_ELEMENT]);
#else
        return 0;
#endif
}

/*
 * 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)                                               \
({                                                                      \
        pg_data_t *__pgdat = NODE_DATA(nid);                            \
        __pgdat->node_start_pfn + __pgdat->node_spanned_pages;          \
})

static inline int pfn_valid(int pfn)
{
        int nid = pfn_to_nid(pfn);

        if (nid >= 0)
                return (pfn < node_end_pfn(nid));
        return 0;
}

#endif /* CONFIG_DISCONTIGMEM */

#ifdef CONFIG_NEED_MULTIPLE_NODES

/*
 * Following are macros that are specific to this numa platform.
 */
#define reserve_bootmem(addr, size, flags) \
        reserve_bootmem_node(NODE_DATA(0), (addr), (size), (flags))
#define alloc_bootmem(x) \
        __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
#define alloc_bootmem_nopanic(x) \
        __alloc_bootmem_node_nopanic(NODE_DATA(0), (x), SMP_CACHE_BYTES, \
                                __pa(MAX_DMA_ADDRESS))
#define alloc_bootmem_low(x) \
        __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, 0)
#define alloc_bootmem_pages(x) \
        __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
#define alloc_bootmem_pages_nopanic(x) \
        __alloc_bootmem_node_nopanic(NODE_DATA(0), (x), PAGE_SIZE, \
                                __pa(MAX_DMA_ADDRESS))
#define alloc_bootmem_low_pages(x) \
        __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, 0)
#define alloc_bootmem_node(pgdat, x)                                    \
({                                                                      \
        struct pglist_data  __maybe_unused                      \
                                *__alloc_bootmem_node__pgdat = (pgdat); \
        __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES,        \
                                                __pa(MAX_DMA_ADDRESS)); \
})
#define alloc_bootmem_pages_node(pgdat, x)                              \
({                                                                      \
        struct pglist_data  __maybe_unused                      \
                                *__alloc_bootmem_node__pgdat = (pgdat); \
        __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE,              \
                                                __pa(MAX_DMA_ADDRESS)); \
})
#define alloc_bootmem_low_pages_node(pgdat, x)                          \
({                                                                      \
        struct pglist_data  __maybe_unused                      \
                                *__alloc_bootmem_node__pgdat = (pgdat); \
        __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, 0);          \
})
#endif /* CONFIG_NEED_MULTIPLE_NODES */

#endif /* ASM_X86__MMZONE_32_H */