include/asm-i386/mmzone.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 #ifdef CONFIG_X86_NUMAQ
  16         #include <asm/numaq.h>
  17 #else   /* summit or generic arch */
  18         #include <asm/srat.h>
  19 #endif
  20
  21 extern int get_memcfg_numa_flat(void );
  22 /*
  23  * This allows any one NUMA architecture to be compiled
  24  * for, and still fall back to the flat function if it
  25  * fails.
  26  */
  27 static inline void get_memcfg_numa(void)
  28 {
  29 #ifdef CONFIG_X86_NUMAQ
  30         if (get_memcfg_numaq())
  31                 return;
  32 #elif CONFIG_ACPI_SRAT
  33         if (get_memcfg_from_srat())
  34                 return;
  35 #endif
  36
  37         get_memcfg_numa_flat();
  38 }
  39
  40 extern int early_pfn_to_nid(unsigned long pfn);
  41
  42 #else /* !CONFIG_NUMA */
  43 #define get_memcfg_numa get_memcfg_numa_flat
  44 #define get_zholes_size(n) (0)
  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 256Mb 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 256
  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 #define node_localnr(pfn, nid)          ((pfn) - node_data[nid]->node_start_pfn)
  74
  75 /*
  76  * Following are macros that each numa implmentation must define.
  77  */
  78
  79 /*
  80  * Given a kernel address, find the home node of the underlying memory.
  81  */
  82 #define kvaddr_to_nid(kaddr)    pfn_to_nid(__pa(kaddr) >> PAGE_SHIFT)
  83
  84 #define node_start_pfn(nid)     (NODE_DATA(nid)->node_start_pfn)
  85 #define node_end_pfn(nid)                                               \
  86 ({                                                                      \
  87         pg_data_t *__pgdat = NODE_DATA(nid);                            \
  88         __pgdat->node_start_pfn + __pgdat->node_spanned_pages;          \
  89 })
  90
  91 #define local_mapnr(kvaddr)                                             \
  92 ({                                                                      \
  93         unsigned long __pfn = __pa(kvaddr) >> PAGE_SHIFT;               \
  94         (__pfn - node_start_pfn(pfn_to_nid(__pfn)));                    \
  95 })
  96
  97 /* XXX: FIXME -- wli */
  98 #define kern_addr_valid(kaddr)  (0)
  99
 100 #define pfn_to_page(pfn)                                                \
 101 ({                                                                      \
 102         unsigned long __pfn = pfn;                                      \
 103         int __node  = pfn_to_nid(__pfn);                                \
 104         &NODE_DATA(__node)->node_mem_map[node_localnr(__pfn,__node)];   \
 105 })
 106
 107 #define page_to_pfn(pg)                                                 \
 108 ({                                                                      \
 109         struct page *__page = pg;                                       \
 110         struct zone *__zone = page_zone(__page);                        \
 111         (unsigned long)(__page - __zone->zone_mem_map)                  \
 112                 + __zone->zone_start_pfn;                               \
 113 })
 114
 115 #ifdef CONFIG_X86_NUMAQ            /* we have contiguous memory on NUMA-Q */
 116 #define pfn_valid(pfn)          ((pfn) < num_physpages)
 117 #else
 118 static inline int pfn_valid(int pfn)
 119 {
 120         int nid = pfn_to_nid(pfn);
 121
 122         if (nid >= 0)
 123                 return (pfn < node_end_pfn(nid));
 124         return 0;
 125 }
 126 #endif /* CONFIG_X86_NUMAQ */
 127
 128 #endif /* CONFIG_DISCONTIGMEM */
 129
 130 #ifdef CONFIG_NEED_MULTIPLE_NODES
 131
 132 /*
 133  * Following are macros that are specific to this numa platform.
 134  */
 135 #define reserve_bootmem(addr, size) \
 136         reserve_bootmem_node(NODE_DATA(0), (addr), (size))
 137 #define alloc_bootmem(x) \
 138         __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
 139 #define alloc_bootmem_low(x) \
 140         __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, 0)
 141 #define alloc_bootmem_pages(x) \
 142         __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
 143 #define alloc_bootmem_low_pages(x) \
 144         __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, 0)
 145 #define alloc_bootmem_node(ignore, x) \
 146         __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
 147 #define alloc_bootmem_pages_node(ignore, x) \
 148         __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
 149 #define alloc_bootmem_low_pages_node(ignore, x) \
 150         __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, 0)
 151
 152 #endif /* CONFIG_NEED_MULTIPLE_NODES */
 153
 154 #endif /* _ASM_MMZONE_H_ */