include/asm-x86/mmzone_32.h

   1 /*
   2  * Written by Pat Gaughen (gone@us.ibm.com) Mar 2002
   3  *
   4  */
   5
   6 #ifndef _ASM_MMZONE_H_
   7 #define _ASM_MMZONE_H_
   8
   9 #include <asm/smp.h>
  10
  11 #ifdef CONFIG_NUMA
  12 extern struct pglist_data *node_data[];
  13 #define NODE_DATA(nid)  (node_data[nid])
  14
  15 #include <asm/numaq.h>
  16 /* summit or generic arch */
  17 #include <asm/srat.h>
  18
  19 extern int get_memcfg_numa_flat(void);
  20 /*
  21  * This allows any one NUMA architecture to be compiled
  22  * for, and still fall back to the flat function if it
  23  * fails.
  24  */
  25 static inline void get_memcfg_numa(void)
  26 {
  27
  28         if (get_memcfg_numaq())
  29                 return;
  30         if (get_memcfg_from_srat())
  31                 return;
  32         get_memcfg_numa_flat();
  33 }
  34
  35 extern int early_pfn_to_nid(unsigned long pfn);
  36
  37 #else /* !CONFIG_NUMA */
  38
  39 #define get_memcfg_numa get_memcfg_numa_flat
  40
  41 #endif /* CONFIG_NUMA */
  42
  43 #ifdef CONFIG_DISCONTIGMEM
  44
  45 /*
  46  * generic node memory support, the following assumptions apply:
  47  *
  48  * 1) memory comes in 64Mb contigious chunks which are either present or not
  49  * 2) we will not have more than 64Gb in total
  50  *
  51  * for now assume that 64Gb is max amount of RAM for whole system
  52  *    64Gb / 4096bytes/page = 16777216 pages
  53  */
  54 #define MAX_NR_PAGES 16777216
  55 #define MAX_ELEMENTS 1024
  56 #define PAGES_PER_ELEMENT (MAX_NR_PAGES/MAX_ELEMENTS)
  57
  58 extern s8 physnode_map[];
  59
  60 static inline int pfn_to_nid(unsigned long pfn)
  61 {
  62 #ifdef CONFIG_NUMA
  63         return((int) physnode_map[(pfn) / PAGES_PER_ELEMENT]);
  64 #else
  65         return 0;
  66 #endif
  67 }
  68
  69 /*
  70  * Following are macros that each numa implmentation must define.
  71  */
  72
  73 #define node_start_pfn(nid)     (NODE_DATA(nid)->node_start_pfn)
  74 #define node_end_pfn(nid)                                               \
  75 ({                                                                      \
  76         pg_data_t *__pgdat = NODE_DATA(nid);                            \
  77         __pgdat->node_start_pfn + __pgdat->node_spanned_pages;          \
  78 })
  79
  80 static inline int pfn_valid(int pfn)
  81 {
  82         int nid = pfn_to_nid(pfn);
  83
  84         if (nid >= 0)
  85                 return (pfn < node_end_pfn(nid));
  86         return 0;
  87 }
  88
  89 #endif /* CONFIG_DISCONTIGMEM */
  90
  91 #ifdef CONFIG_NEED_MULTIPLE_NODES
  92
  93 /*
  94  * Following are macros that are specific to this numa platform.
  95  */
  96 #define reserve_bootmem(addr, size, flags) \
  97         reserve_bootmem_node(NODE_DATA(0), (addr), (size), (flags))
  98 #define alloc_bootmem(x) \
  99         __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
 100 #define alloc_bootmem_low(x) \
 101         __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, 0)
 102 #define alloc_bootmem_pages(x) \
 103         __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
 104 #define alloc_bootmem_low_pages(x) \
 105         __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, 0)
 106 #define alloc_bootmem_node(pgdat, x)                                    \
 107 ({                                                                      \
 108         struct pglist_data  __maybe_unused                      \
 109                                 *__alloc_bootmem_node__pgdat = (pgdat); \
 110         __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES,        \
 111                                                 __pa(MAX_DMA_ADDRESS)); \
 112 })
 113 #define alloc_bootmem_pages_node(pgdat, x)                              \
 114 ({                                                                      \
 115         struct pglist_data  __maybe_unused                      \
 116                                 *__alloc_bootmem_node__pgdat = (pgdat); \
 117         __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE,              \
 118                                                 __pa(MAX_DMA_ADDRESS)); \
 119 })
 120 #define alloc_bootmem_low_pages_node(pgdat, x)                          \
 121 ({                                                                      \
 122         struct pglist_data  __maybe_unused                      \
 123                                 *__alloc_bootmem_node__pgdat = (pgdat); \
 124         __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, 0);          \
 125 })
 126 #endif /* CONFIG_NEED_MULTIPLE_NODES */
 127
 128 #endif /* _ASM_MMZONE_H_ */