include/asm-sh/mmzone.h

   1 /*
   2  *  linux/include/asm-sh/mmzone.h
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8 #ifndef __ASM_SH_MMZONE_H
   9 #define __ASM_SH_MMZONE_H
  10
  11 #include <linux/config.h>
  12
  13 #ifdef CONFIG_DISCONTIGMEM
  14
  15 /* Currently, just for HP690 */
  16 #define PHYSADDR_TO_NID(phys)   ((((phys) - __MEMORY_START) >= 0x01000000)?1:0)
  17
  18 extern pg_data_t discontig_page_data[MAX_NUMNODES];
  19 extern bootmem_data_t discontig_node_bdata[MAX_NUMNODES];
  20
  21 /*
  22  * Following are macros that each numa implmentation must define.
  23  */
  24
  25 /*
  26  * Given a kernel address, find the home node of the underlying memory.
  27  */
  28 #define KVADDR_TO_NID(kaddr)    PHYSADDR_TO_NID(__pa(kaddr))
  29
  30 /*
  31  * Return a pointer to the node data for node n.
  32  */
  33 #define NODE_DATA(nid)          (&discontig_page_data[nid])
  34
  35 /*
  36  * NODE_MEM_MAP gives the kaddr for the mem_map of the node.
  37  */
  38 #define NODE_MEM_MAP(nid)       (NODE_DATA(nid)->node_mem_map)
  39
  40 #define phys_to_page(phys)                                              \
  41 ({ unsigned int node = PHYSADDR_TO_NID(phys);                           \
  42    NODE_MEM_MAP(node)                                                   \
  43      + (((phys) - NODE_DATA(node)->node_start_paddr) >> PAGE_SHIFT); })
  44
  45 static inline int is_valid_page(struct page *page)
  46 {
  47         unsigned int i;
  48
  49         for (i = 0; i < MAX_NUMNODES; i++) {
  50                 if (page >= NODE_MEM_MAP(i) &&
  51                     page < NODE_MEM_MAP(i) + NODE_DATA(i)->node_size)
  52                         return 1;
  53         }
  54         return 0;
  55 }
  56
  57 #define VALID_PAGE(page)        is_valid_page(page)
  58 #define page_to_phys(page)      PHYSADDR(page_address(page))
  59
  60 #endif /* CONFIG_DISCONTIGMEM */
  61 #endif