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 #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 /* XXX: FIXME -- wli */
  91 #define kern_addr_valid(kaddr)  (0)
  92
  93 #ifdef CONFIG_X86_NUMAQ            /* we have contiguous memory on NUMA-Q */
  94 #define pfn_valid(pfn)          ((pfn) < num_physpages)
  95 #else
  96 static inline int pfn_valid(int pfn)
  97 {
  98         int nid = pfn_to_nid(pfn);
  99
 100         if (nid >= 0)
 101                 return (pfn < node_end_pfn(nid));
 102         return 0;
 103 }
 104 #endif /* CONFIG_X86_NUMAQ */
 105
 106 #endif /* CONFIG_DISCONTIGMEM */
 107
 108 #ifdef CONFIG_NEED_MULTIPLE_NODES
 109
 110 /*
 111  * Following are macros that are specific to this numa platform.
 112  */
 113 #define reserve_bootmem(addr, size) \
 114         reserve_bootmem_node(NODE_DATA(0), (addr), (size))
 115 #define alloc_bootmem(x) \
 116         __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
 117 #define alloc_bootmem_low(x) \
 118         __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES, 0)
 119 #define alloc_bootmem_pages(x) \
 120         __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
 121 #define alloc_bootmem_low_pages(x) \
 122         __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, 0)
 123 #define alloc_bootmem_node(pgdat, x)                                    \
 124 ({                                                                      \
 125         struct pglist_data  __attribute__ ((unused))                    \
 126                                 *__alloc_bootmem_node__pgdat = (pgdat); \
 127         __alloc_bootmem_node(NODE_DATA(0), (x), SMP_CACHE_BYTES,        \
 128                                                 __pa(MAX_DMA_ADDRESS)); \
 129 })
 130 #define alloc_bootmem_pages_node(pgdat, x)                              \
 131 ({                                                                      \
 132         struct pglist_data  __attribute__ ((unused))                    \
 133                                 *__alloc_bootmem_node__pgdat = (pgdat); \
 134         __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE,              \
 135                                                 __pa(MAX_DMA_ADDRESS))  \
 136 })
 137 #define alloc_bootmem_low_pages_node(pgdat, x)                          \
 138 ({                                                                      \
 139         struct pglist_data  __attribute__ ((unused))                    \
 140                                 *__alloc_bootmem_node__pgdat = (pgdat); \
 141         __alloc_bootmem_node(NODE_DATA(0), (x), PAGE_SIZE, 0);          \
 142 })
 143 #endif /* CONFIG_NEED_MULTIPLE_NODES */
 144
 145 #endif /* _ASM_MMZONE_H_ */