LXR linux/arch/parisc/include/asm/mmzone.h

   1#ifndef _PARISC_MMZONE_H
   2#define _PARISC_MMZONE_H
   3
   4#ifdef CONFIG_DISCONTIGMEM
   5
   6#define MAX_PHYSMEM_RANGES 8 /* Fix the size for now (current known max is 3) */
   7extern int npmem_ranges;
   8
   9struct node_map_data {
  10    pg_data_t pg_data;
  11};
  12
  13extern struct node_map_data node_data[];
  14
  15#define NODE_DATA(nid)          (&node_data[nid].pg_data)
  16
  17#define node_start_pfn(nid)     (NODE_DATA(nid)->node_start_pfn)
  18#define node_end_pfn(nid)                                               \
  19({                                                                      \
  20        pg_data_t *__pgdat = NODE_DATA(nid);                            \
  21        __pgdat->node_start_pfn + __pgdat->node_spanned_pages;          \
  22})
  23
  24/* We have these possible memory map layouts:
  25 * Astro: 0-3.75, 67.75-68, 4-64
  26 * zx1: 0-1, 257-260, 4-256
  27 * Stretch (N-class): 0-2, 4-32, 34-xxx
  28 */
  29
  30/* Since each 1GB can only belong to one region (node), we can create
  31 * an index table for pfn to nid lookup; each entry in pfnnid_map 
  32 * represents 1GB, and contains the node that the memory belongs to. */
  33
  34#define PFNNID_SHIFT (30 - PAGE_SHIFT)
  35#define PFNNID_MAP_MAX  512     /* support 512GB */
  36extern unsigned char pfnnid_map[PFNNID_MAP_MAX];
  37
  38#ifndef CONFIG_64BIT
  39#define pfn_is_io(pfn) ((pfn & (0xf0000000UL >> PAGE_SHIFT)) == (0xf0000000UL >> PAGE_SHIFT))
  40#else
  41/* io can be 0xf0f0f0f0f0xxxxxx or 0xfffffffff0000000 */
  42#define pfn_is_io(pfn) ((pfn & (0xf000000000000000UL >> PAGE_SHIFT)) == (0xf000000000000000UL >> PAGE_SHIFT))
  43#endif
  44
  45static inline int pfn_to_nid(unsigned long pfn)
  46{
  47        unsigned int i;
  48        unsigned char r;
  49
  50        if (unlikely(pfn_is_io(pfn)))
  51                return 0;
  52
  53        i = pfn >> PFNNID_SHIFT;
  54        BUG_ON(i >= sizeof(pfnnid_map) / sizeof(pfnnid_map[0]));
  55        r = pfnnid_map[i];
  56        BUG_ON(r == 0xff);
  57
  58        return (int)r;
  59}
  60
  61static inline int pfn_valid(int pfn)
  62{
  63        int nid = pfn_to_nid(pfn);
  64
  65        if (nid >= 0)
  66                return (pfn < node_end_pfn(nid));
  67        return 0;
  68}
  69
  70#else /* !CONFIG_DISCONTIGMEM */
  71#define MAX_PHYSMEM_RANGES      1 
  72#endif
  73#endif /* _PARISC_MMZONE_H */
  74