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 static inline struct pglist_data *pfn_to_pgdat(unsigned long pfn)
  52 {
  53         return(NODE_DATA(pfn_to_nid(pfn)));
  54 }
  55
  56
  57 /*
  58  * Following are macros that are specific to this numa platform.
  59  */
  60 #define reserve_bootmem(addr, size) \
  61         reserve_bootmem_node(NODE_DATA(0), (addr), (size))
  62 #define alloc_bootmem(x) \
  63         __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
  64 #define alloc_bootmem_low(x) \
  65         __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, 0)
  66 #define alloc_bootmem_pages(x) \
  67         __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
  68 #define alloc_bootmem_low_pages(x) \
  69         __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, 0)
  70 #define alloc_bootmem_node(ignore, x) \
  71         __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
  72 #define alloc_bootmem_pages_node(ignore, x) \
  73         __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
  74 #define alloc_bootmem_low_pages_node(ignore, x) \
  75         __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, 0)
  76
  77 #define node_localnr(pfn, nid)          ((pfn) - node_data[nid]->node_start_pfn)
  78
  79 /*
  80  * Following are macros that each numa implmentation must define.
  81  */
  82
  83 /*
  84  * Given a kernel address, find the home node of the underlying memory.
  85  */
  86 #define kvaddr_to_nid(kaddr)    pfn_to_nid(__pa(kaddr) >> PAGE_SHIFT)
  87
  88 #define node_mem_map(nid)       (NODE_DATA(nid)->node_mem_map)
  89 #define node_start_pfn(nid)     (NODE_DATA(nid)->node_start_pfn)
  90 #define node_end_pfn(nid)                                               \
  91 ({                                                                      \
  92         pg_data_t *__pgdat = NODE_DATA(nid);                            \
  93         __pgdat->node_start_pfn + __pgdat->node_spanned_pages;          \
  94 })
  95
  96 #define local_mapnr(kvaddr)                                             \
  97 ({                                                                      \
  98         unsigned long __pfn = __pa(kvaddr) >> PAGE_SHIFT;               \
  99         (__pfn - node_start_pfn(pfn_to_nid(__pfn)));                    \
 100 })
 101
 102 /* XXX: FIXME -- wli */
 103 #define kern_addr_valid(kaddr)  (0)
 104
 105 #define pfn_to_page(pfn)                                                \
 106 ({                                                                      \
 107         unsigned long __pfn = pfn;                                      \
 108         int __node  = pfn_to_nid(__pfn);                                \
 109         &node_mem_map(__node)[node_localnr(__pfn,__node)];              \
 110 })
 111
 112 #define page_to_pfn(pg)                                                 \
 113 ({                                                                      \
 114         struct page *__page = pg;                                       \
 115         struct zone *__zone = page_zone(__page);                        \
 116         (unsigned long)(__page - __zone->zone_mem_map)                  \
 117                 + __zone->zone_start_pfn;                               \
 118 })
 119 #define pmd_page(pmd)           (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
 120
 121 #ifdef CONFIG_X86_NUMAQ            /* we have contiguous memory on NUMA-Q */
 122 #define pfn_valid(pfn)          ((pfn) < num_physpages)
 123 #else
 124 static inline int pfn_valid(int pfn)
 125 {
 126         int nid = pfn_to_nid(pfn);
 127
 128         if (nid >= 0)
 129                 return (pfn < node_end_pfn(nid));
 130         return 0;
 131 }
 132 #endif
 133
 134 extern int get_memcfg_numa_flat(void );
 135 /*
 136  * This allows any one NUMA architecture to be compiled
 137  * for, and still fall back to the flat function if it
 138  * fails.
 139  */
 140 static inline void get_memcfg_numa(void)
 141 {
 142 #ifdef CONFIG_X86_NUMAQ
 143         if (get_memcfg_numaq())
 144                 return;
 145 #elif CONFIG_ACPI_SRAT
 146         if (get_memcfg_from_srat())
 147                 return;
 148 #endif
 149
 150         get_memcfg_numa_flat();
 151 }
 152
 153 #endif /* CONFIG_DISCONTIGMEM */
 154 #endif /* _ASM_MMZONE_H_ */