arch/parisc/include/asm/mmzone.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _PARISC_MMZONE_H
   3 #define _PARISC_MMZONE_H
   4
   5 #define MAX_PHYSMEM_RANGES 8 /* Fix the size for now (current known max is 3) */
   6
   7 #ifdef CONFIG_DISCONTIGMEM
   8
   9 extern int npmem_ranges;
  10
  11 struct node_map_data {
  12     pg_data_t pg_data;
  13 };
  14
  15 extern struct node_map_data node_data[];
  16
  17 #define NODE_DATA(nid)          (&node_data[nid].pg_data)
  18
  19 /* We have these possible memory map layouts:
  20  * Astro: 0-3.75, 67.75-68, 4-64
  21  * zx1: 0-1, 257-260, 4-256
  22  * Stretch (N-class): 0-2, 4-32, 34-xxx
  23  */
  24
  25 /* Since each 1GB can only belong to one region (node), we can create
  26  * an index table for pfn to nid lookup; each entry in pfnnid_map
  27  * represents 1GB, and contains the node that the memory belongs to. */
  28
  29 #define PFNNID_SHIFT (30 - PAGE_SHIFT)
  30 #define PFNNID_MAP_MAX  512     /* support 512GB */
  31 extern signed char pfnnid_map[PFNNID_MAP_MAX];
  32
  33 #ifndef CONFIG_64BIT
  34 #define pfn_is_io(pfn) ((pfn & (0xf0000000UL >> PAGE_SHIFT)) == (0xf0000000UL >> PAGE_SHIFT))
  35 #else
  36 /* io can be 0xf0f0f0f0f0xxxxxx or 0xfffffffff0000000 */
  37 #define pfn_is_io(pfn) ((pfn & (0xf000000000000000UL >> PAGE_SHIFT)) == (0xf000000000000000UL >> PAGE_SHIFT))
  38 #endif
  39
  40 static inline int pfn_to_nid(unsigned long pfn)
  41 {
  42         unsigned int i;
  43
  44         if (unlikely(pfn_is_io(pfn)))
  45                 return 0;
  46
  47         i = pfn >> PFNNID_SHIFT;
  48         BUG_ON(i >= ARRAY_SIZE(pfnnid_map));
  49
  50         return pfnnid_map[i];
  51 }
  52
  53 static inline int pfn_valid(int pfn)
  54 {
  55         int nid = pfn_to_nid(pfn);
  56
  57         if (nid >= 0)
  58                 return (pfn < node_end_pfn(nid));
  59         return 0;
  60 }
  61
  62 #endif
  63 #endif /* _PARISC_MMZONE_H */