arch/x86/include/asm/mmzone_32.h

   1 /*
   2  * Written by Pat Gaughen (gone@us.ibm.com) Mar 2002
   3  *
   4  */
   5
   6 #ifndef _ASM_X86_MMZONE_32_H
   7 #define _ASM_X86_MMZONE_32_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 extern void resume_map_numa_kva(pgd_t *pgd);
  38
  39 #else /* !CONFIG_NUMA */
  40
  41 #define get_memcfg_numa get_memcfg_numa_flat
  42
  43 static inline void resume_map_numa_kva(pgd_t *pgd) {}
  44
  45 #endif /* CONFIG_NUMA */
  46
  47 #ifdef CONFIG_DISCONTIGMEM
  48
  49 /*
  50  * generic node memory support, the following assumptions apply:
  51  *
  52  * 1) memory comes in 64Mb contigious chunks which are either present or not
  53  * 2) we will not have more than 64Gb in total
  54  *
  55  * for now assume that 64Gb is max amount of RAM for whole system
  56  *    64Gb / 4096bytes/page = 16777216 pages
  57  */
  58 #define MAX_NR_PAGES 16777216
  59 #define MAX_ELEMENTS 1024
  60 #define PAGES_PER_ELEMENT (MAX_NR_PAGES/MAX_ELEMENTS)
  61
  62 extern s8 physnode_map[];
  63
  64 static inline int pfn_to_nid(unsigned long pfn)
  65 {
  66 #ifdef CONFIG_NUMA
  67         return((int) physnode_map[(pfn) / PAGES_PER_ELEMENT]);
  68 #else
  69         return 0;
  70 #endif
  71 }
  72
  73 /*
  74  * Following are macros that each numa implmentation must define.
  75  */
  76
  77 #define node_start_pfn(nid)     (NODE_DATA(nid)->node_start_pfn)
  78 #define node_end_pfn(nid)                                               \
  79 ({                                                                      \
  80         pg_data_t *__pgdat = NODE_DATA(nid);                            \
  81         __pgdat->node_start_pfn + __pgdat->node_spanned_pages;          \
  82 })
  83
  84 static inline int pfn_valid(int pfn)
  85 {
  86         int nid = pfn_to_nid(pfn);
  87
  88         if (nid >= 0)
  89                 return (pfn < node_end_pfn(nid));
  90         return 0;
  91 }
  92
  93 #endif /* CONFIG_DISCONTIGMEM */
  94
  95 #ifdef CONFIG_NEED_MULTIPLE_NODES
  96
  97 /*
  98  * Following are macros that are specific to this numa platform.
  99  */
 100 #define reserve_bootmem(addr, size, flags) \
 101         reserve_bootmem_node(NODE_DATA(0), (addr), (size), (flags))
 102 #define alloc_bootmem(x) \
 103         __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
 104 #define alloc_bootmem_nopanic(x) \
 105         __alloc_bootmem_node_nopanic(NODE_DATA(0), (x), SMP_CACHE_BYTES, \
 106                                 __pa(MAX_DMA_ADDRESS))
 107 #define alloc_bootmem_low(x) \
 108         __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, 0)
 109 #define alloc_bootmem_pages(x) \
 110         __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
 111 #define alloc_bootmem_pages_nopanic(x) \
 112         __alloc_bootmem_node_nopanic(NODE_DATA(0), (x), PAGE_SIZE, \
 113                                 __pa(MAX_DMA_ADDRESS))
 114 #define alloc_bootmem_low_pages(x) \
 115         __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, 0)
 116 #define alloc_bootmem_node(pgdat, x)                                    \
 117 ({                                                                      \
 118         struct pglist_data  __maybe_unused                      \
 119                                 *__alloc_bootmem_node__pgdat = (pgdat); \
 120         __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES,        \
 121                                                 __pa(MAX_DMA_ADDRESS)); \
 122 })
 123 #define alloc_bootmem_pages_node(pgdat, x)                              \
 124 ({                                                                      \
 125         struct pglist_data  __maybe_unused                      \
 126                                 *__alloc_bootmem_node__pgdat = (pgdat); \
 127         __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE,              \
 128                                                 __pa(MAX_DMA_ADDRESS)); \
 129 })
 130 #define alloc_bootmem_low_pages_node(pgdat, x)                          \
 131 ({                                                                      \
 132         struct pglist_data  __maybe_unused                      \
 133                                 *__alloc_bootmem_node__pgdat = (pgdat); \
 134         __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, 0);          \
 135 })
 136 #endif /* CONFIG_NEED_MULTIPLE_NODES */
 137
 138 #endif /* _ASM_X86_MMZONE_32_H */