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_DISCONTIGMEM
  12
  13 #ifdef CONFIG_NUMA
  14         #ifdef CONFIG_X86_NUMAQ
  15                 #include <asm/numaq.h>
  16         #else   /* summit or generic arch */
  17                 #include <asm/srat.h>
  18         #endif
  19 #else /* !CONFIG_NUMA */
  20         #define get_memcfg_numa get_memcfg_numa_flat
  21         #define get_zholes_size(n) (0)
  22 #endif /* CONFIG_NUMA */
  23
  24 extern struct pglist_data *node_data[];
  25 #define NODE_DATA(nid)          (node_data[nid])
  26
  27 /*
  28  * generic node memory support, the following assumptions apply:
  29  *
  30  * 1) memory comes in 256Mb contigious chunks which are either present or not
  31  * 2) we will not have more than 64Gb in total
  32  *
  33  * for now assume that 64Gb is max amount of RAM for whole system
  34  *    64Gb / 4096bytes/page = 16777216 pages
  35  */
  36 #define MAX_NR_PAGES 16777216
  37 #define MAX_ELEMENTS 256
  38 #define PAGES_PER_ELEMENT (MAX_NR_PAGES/MAX_ELEMENTS)
  39
  40 extern s8 physnode_map[];
  41
  42 static inline int pfn_to_nid(unsigned long pfn)
  43 {
  44 #ifdef CONFIG_NUMA
  45         return((int) physnode_map[(pfn) / PAGES_PER_ELEMENT]);
  46 #else
  47         return 0;
  48 #endif
  49 }
  50
  51 /*
  52  * Following are macros that are specific to this numa platform.
  53  */
  54 #define reserve_bootmem(addr, size) \
  55         reserve_bootmem_node(NODE_DATA(0), (addr), (size))
  56 #define alloc_bootmem(x) \
  57         __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
  58 #define alloc_bootmem_low(x) \
  59         __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, 0)
  60 #define alloc_bootmem_pages(x) \
  61         __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
  62 #define alloc_bootmem_low_pages(x) \
  63         __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, 0)
  64 #define alloc_bootmem_node(ignore, x) \
  65         __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
  66 #define alloc_bootmem_pages_node(ignore, x) \
  67         __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
  68 #define alloc_bootmem_low_pages_node(ignore, x) \
  69         __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, 0)
  70
  71 #define node_localnr(pfn, nid)          ((pfn) - node_data[nid]->node_start_pfn)
  72
  73 /*
  74  * Following are macros that each numa implmentation must define.
  75  */
  76
  77 /*
  78  * Given a kernel address, find the home node of the underlying memory.
  79  */
  80 #define kvaddr_to_nid(kaddr)    pfn_to_nid(__pa(kaddr) >> PAGE_SHIFT)
  81
  82 #define node_mem_map(nid)       (NODE_DATA(nid)->node_mem_map)
  83 #define node_start_pfn(nid)     (NODE_DATA(nid)->node_start_pfn)
  84 #define node_end_pfn(nid)                                               \
  85 ({                                                                      \
  86         pg_data_t *__pgdat = NODE_DATA(nid);                            \
  87         __pgdat->node_start_pfn + __pgdat->node_spanned_pages;          \
  88 })
  89
  90 #define local_mapnr(kvaddr)                                             \
  91 ({                                                                      \
  92         unsigned long __pfn = __pa(kvaddr) >> PAGE_SHIFT;               \
  93         (__pfn - node_start_pfn(pfn_to_nid(__pfn)));                    \
  94 })
  95
  96 /* XXX: FIXME -- wli */
  97 #define kern_addr_valid(kaddr)  (0)
  98
  99 #define pfn_to_page(pfn)                                                \
 100 ({                                                                      \
 101         unsigned long __pfn = pfn;                                      \
 102         int __node  = pfn_to_nid(__pfn);                                \
 103         &node_mem_map(__node)[node_localnr(__pfn,__node)];              \
 104 })
 105
 106 #define page_to_pfn(pg)                                                 \
 107 ({                                                                      \
 108         struct page *__page = pg;                                       \
 109         struct zone *__zone = page_zone(__page);                        \
 110         (unsigned long)(__page - __zone->zone_mem_map)                  \
 111                 + __zone->zone_start_pfn;                               \
 112 })
 113
 114 #ifdef CONFIG_X86_NUMAQ            /* we have contiguous memory on NUMA-Q */
 115 #define pfn_valid(pfn)          ((pfn) < num_physpages)
 116 #else
 117 static inline int pfn_valid(int pfn)
 118 {
 119         int nid = pfn_to_nid(pfn);
 120
 121         if (nid >= 0)
 122                 return (pfn < node_end_pfn(nid));
 123         return 0;
 124 }
 125 #endif
 126
 127 extern int get_memcfg_numa_flat(void );
 128 /*
 129  * This allows any one NUMA architecture to be compiled
 130  * for, and still fall back to the flat function if it
 131  * fails.
 132  */
 133 static inline void get_memcfg_numa(void)
 134 {
 135 #ifdef CONFIG_X86_NUMAQ
 136         if (get_memcfg_numaq())
 137                 return;
 138 #elif CONFIG_ACPI_SRAT
 139         if (get_memcfg_from_srat())
 140                 return;
 141 #endif
 142
 143         get_memcfg_numa_flat();
 144 }
 145
 146 #endif /* CONFIG_DISCONTIGMEM */
 147 #endif /* _ASM_MMZONE_H_ */