arch/arc/include/asm/mmzone.h

   1 /*
   2  * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
   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
   9 #ifndef _ASM_ARC_MMZONE_H
  10 #define _ASM_ARC_MMZONE_H
  11
  12 #ifdef CONFIG_DISCONTIGMEM
  13
  14 extern struct pglist_data node_data[];
  15 #define NODE_DATA(nid) (&node_data[nid])
  16
  17 static inline int pfn_to_nid(unsigned long pfn)
  18 {
  19         int is_end_low = 1;
  20
  21         if (IS_ENABLED(CONFIG_ARC_HAS_PAE40))
  22                 is_end_low = pfn <= virt_to_pfn(0xFFFFFFFFUL);
  23
  24         /*
  25          * node 0: lowmem:             0x8000_0000   to 0xFFFF_FFFF
  26          * node 1: HIGHMEM w/o  PAE40: 0x0           to 0x7FFF_FFFF
  27          *         HIGHMEM with PAE40: 0x1_0000_0000 to ...
  28          */
  29         if (pfn >= ARCH_PFN_OFFSET && is_end_low)
  30                 return 0;
  31
  32         return 1;
  33 }
  34
  35 static inline int pfn_valid(unsigned long pfn)
  36 {
  37         int nid = pfn_to_nid(pfn);
  38
  39         return (pfn <= node_end_pfn(nid));
  40 }
  41 #endif /* CONFIG_DISCONTIGMEM  */
  42
  43 #endif