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 #ifdef CONFIG_X86_NUMAQ
  16         #include <asm/numaq.h>
  17 #elif defined(CONFIG_ACPI_SRAT)/* 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 defined(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 extern void numa_kva_reserve(void);
  42
  43 #else /* !CONFIG_NUMA */
  44
  45 #define get_memcfg_numa get_memcfg_numa_flat
  46 #define get_zholes_size(n) (0)
  47
  48 static inline void numa_kva_reserve(void)
  49 {
  50 }
  51 #endif /* CONFIG_NUMA */
  52
  53 #ifdef CONFIG_DISCONTIGMEM
  54
  55 /*
  56  * generic node memory support, the following assumptions apply:
  57  *
  58  * 1) memory comes in 256Mb contigious chunks which are either present or not
  59  * 2) we will not have more than 64Gb in total
  60  *
  61  * for now assume that 64Gb is max amount of RAM for whole system
  62  *    64Gb / 4096bytes/page = 16777216 pages
  63  */
  64 #define MAX_NR_PAGES 16777216
  65 #define MAX_ELEMENTS 256
  66 #define PAGES_PER_ELEMENT (MAX_NR_PAGES/MAX_ELEMENTS)
  67
  68 extern s8 physnode_map[];
  69
  70 static inline int pfn_to_nid(unsigned long pfn)
  71 {
  72 #ifdef CONFIG_NUMA
  73         return((int) physnode_map[(pfn) / PAGES_PER_ELEMENT]);
  74 #else
  75         return 0;
  76 #endif
  77 }
  78
  79 /*
  80  * Following are macros that each numa implmentation must define.
  81  */
  82
  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 #ifdef CONFIG_X86_NUMAQ            /* we have contiguous memory on NUMA-Q */
  91 #define pfn_valid(pfn)          ((pfn) < num_physpages)
  92 #else
  93 static inline int pfn_valid(int pfn)
  94 {
  95         int nid = pfn_to_nid(pfn);
  96
  97         if (nid >= 0)
  98                 return (pfn < node_end_pfn(nid));
  99         return 0;
 100 }
 101 #endif /* CONFIG_X86_NUMAQ */
 102
 103 #endif /* CONFIG_DISCONTIGMEM */
 104
 105 #ifdef CONFIG_NEED_MULTIPLE_NODES
 106
 107 /*
 108  * Following are macros that are specific to this numa platform.
 109  */
 110 #define reserve_bootmem(addr, size, flags) \
 111         reserve_bootmem_node(NODE_DATA(0), (addr), (size), (flags))
 112 #define alloc_bootmem(x) \
 113         __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
 114 #define alloc_bootmem_low(x) \
 115         __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, 0)
 116 #define alloc_bootmem_pages(x) \
 117         __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
 118 #define alloc_bootmem_low_pages(x) \
 119         __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, 0)
 120 #define alloc_bootmem_node(pgdat, x)                                    \
 121 ({                                                                      \
 122         struct pglist_data  __maybe_unused                      \
 123                                 *__alloc_bootmem_node__pgdat = (pgdat); \
 124         __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES,        \
 125                                                 __pa(MAX_DMA_ADDRESS)); \
 126 })
 127 #define alloc_bootmem_pages_node(pgdat, x)                              \
 128 ({                                                                      \
 129         struct pglist_data  __maybe_unused                      \
 130                                 *__alloc_bootmem_node__pgdat = (pgdat); \
 131         __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE,              \
 132                                                 __pa(MAX_DMA_ADDRESS)); \
 133 })
 134 #define alloc_bootmem_low_pages_node(pgdat, x)                          \
 135 ({                                                                      \
 136         struct pglist_data  __maybe_unused                      \
 137                                 *__alloc_bootmem_node__pgdat = (pgdat); \
 138         __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, 0);          \
 139 })
 140 #endif /* CONFIG_NEED_MULTIPLE_NODES */
 141
 142 #endif /* _ASM_MMZONE_H_ */