release/src-rt-6.x.4708/linux/linux-2.6.36/arch/tile/include/asm/mmzone.h

   1 /*
   2  * Copyright 2010 Tilera Corporation. All Rights Reserved.
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful, but
   9  *   WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  11  *   NON INFRINGEMENT.  See the GNU General Public License for
  12  *   more details.
  13  */
  14
  15 #ifndef _ASM_TILE_MMZONE_H
  16 #define _ASM_TILE_MMZONE_H
  17
  18 extern struct pglist_data node_data[];
  19 #define NODE_DATA(nid)  (&node_data[nid])
  20
  21 extern void get_memcfg_numa(void);
  22
  23 #ifdef CONFIG_DISCONTIGMEM
  24
  25 #include <asm/page.h>
  26
  27 /*
  28  * Generally, memory ranges are always doled out by the hypervisor in
  29  * fixed-size, power-of-two increments.  That would make computing the node
  30  * very easy.  We could just take a couple high bits of the PA, which
  31  * denote the memory shim, and we'd be done.  However, when we're doing
  32  * memory striping, this may not be true; PAs with different high bit
  33  * values might be in the same node.  Thus, we keep a lookup table to
  34  * translate the high bits of the PFN to the node number.
  35  */
  36 extern int highbits_to_node[];
  37
  38 static inline int pfn_to_nid(unsigned long pfn)
  39 {
  40         return highbits_to_node[__pfn_to_highbits(pfn)];
  41 }
  42
  43 /*
  44  * Following are macros that each numa implmentation must define.
  45  */
  46
  47 #define node_start_pfn(nid)     (NODE_DATA(nid)->node_start_pfn)
  48 #define node_end_pfn(nid)                                               \
  49 ({                                                                      \
  50         pg_data_t *__pgdat = NODE_DATA(nid);                            \
  51         __pgdat->node_start_pfn + __pgdat->node_spanned_pages;          \
  52 })
  53
  54 #define kern_addr_valid(kaddr)  virt_addr_valid((void *)kaddr)
  55
  56 static inline int pfn_valid(int pfn)
  57 {
  58         int nid = pfn_to_nid(pfn);
  59
  60         if (nid >= 0)
  61                 return (pfn < node_end_pfn(nid));
  62         return 0;
  63 }
  64
  65 /* Information on the NUMA nodes that we compute early */
  66 extern unsigned long node_start_pfn[];
  67 extern unsigned long node_end_pfn[];
  68 extern unsigned long node_memmap_pfn[];
  69 extern unsigned long node_percpu_pfn[];
  70 extern unsigned long node_free_pfn[];
  71 #ifdef CONFIG_HIGHMEM
  72 extern unsigned long node_lowmem_end_pfn[];
  73 #endif
  74 #ifdef CONFIG_PCI
  75 extern unsigned long pci_reserve_start_pfn;
  76 extern unsigned long pci_reserve_end_pfn;
  77 #endif
  78
  79 #endif /* CONFIG_DISCONTIGMEM */
  80
  81 #endif /* _ASM_TILE_MMZONE_H */