include/linux/mmzone.h

   1 #ifndef _LINUX_MMZONE_H
   2 #define _LINUX_MMZONE_H
   3
   4 #ifdef __KERNEL__
   5 #ifndef __ASSEMBLY__
   6
   7 #include <linux/config.h>
   8 #include <linux/spinlock.h>
   9 #include <linux/list.h>
  10
  11 /*
  12  * Free memory management - zoned buddy allocator.
  13  */
  14
  15 #if CONFIG_AP1000
  16 /* the AP+ needs to allocate 8MB contiguous, aligned chunks of ram
  17    for the ring buffers */
  18 #define MAX_ORDER 12
  19 #else
  20 #define MAX_ORDER 10
  21 #endif
  22
  23 typedef struct free_area_struct {
  24         struct list_head free_list;
  25         unsigned int * map;
  26 } free_area_t;
  27
  28 typedef struct zone_struct {
  29         /*
  30          * Commonly accessed fields:
  31          */
  32         spinlock_t lock;
  33         unsigned long offset;
  34         unsigned long free_pages;
  35         int low_on_memory;
  36         unsigned long pages_low, pages_high;
  37
  38         /*
  39          * free areas of different sizes
  40          */
  41         free_area_t free_area[MAX_ORDER];
  42
  43         /*
  44          * rarely used fields:
  45          */
  46         char * name;
  47         unsigned long size;
  48 } zone_t;
  49
  50 #define ZONE_DMA                0
  51 #define ZONE_NORMAL             1
  52 #define ZONE_HIGHMEM            2
  53 #define MAX_NR_ZONES            3
  54
  55 /*
  56  * One allocation request operates on a zonelist. A zonelist
  57  * is a list of zones, the first one is the 'goal' of the
  58  * allocation, the other zones are fallback zones, in decreasing
  59  * priority.
  60  *
  61  * Right now a zonelist takes up less than a cacheline. We never
  62  * modify it apart from boot-up, and only a few indices are used,
  63  * so despite the zonelist table being relatively big, the cache
  64  * footprint of this construct is very small.
  65  */
  66 typedef struct zonelist_struct {
  67         zone_t * zones [MAX_NR_ZONES+1]; // NULL delimited
  68         int gfp_mask;
  69 } zonelist_t;
  70
  71 #define NR_GFPINDEX             0x100
  72
  73 struct bootmem_data;
  74 typedef struct pglist_data {
  75         zone_t node_zones[MAX_NR_ZONES];
  76         zonelist_t node_zonelists[NR_GFPINDEX];
  77         struct page *node_mem_map;
  78         unsigned long *valid_addr_bitmap;
  79         struct bootmem_data *bdata;
  80 } pg_data_t;
  81
  82 extern int numnodes;
  83
  84 #ifndef CONFIG_DISCONTIGMEM
  85
  86 extern pg_data_t contig_page_data;
  87
  88 #define NODE_DATA(nid)          (&contig_page_data)
  89 #define NODE_MEM_MAP(nid)       mem_map
  90
  91 #else /* !CONFIG_DISCONTIGMEM */
  92
  93 #include <asm/mmzone.h>
  94
  95 #endif /* !CONFIG_DISCONTIGMEM */
  96
  97 #define MAP_ALIGN(x)    ((((x) % sizeof(mem_map_t)) == 0) ? (x) : ((x) + \
  98                 sizeof(mem_map_t) - ((x) % sizeof(mem_map_t))))
  99
 100 #ifdef CONFIG_DISCONTIGMEM
 101
 102 #define LOCAL_MAP_NR(kvaddr) \
 103         (((unsigned long)(kvaddr)-LOCAL_BASE_ADDR((kvaddr))) >> PAGE_SHIFT)
 104 #define MAP_NR(kaddr)   (LOCAL_MAP_NR((kaddr)) + \
 105                 (((unsigned long)ADDR_TO_MAPBASE((kaddr)) - PAGE_OFFSET) / \
 106                 sizeof(mem_map_t)))
 107 #define kern_addr_valid(addr)   ((KVADDR_TO_NID((unsigned long)addr) >= \
 108         numnodes) ? 0 : (test_bit(LOCAL_MAP_NR((addr)), \
 109         NODE_DATA(KVADDR_TO_NID((unsigned long)addr))->valid_addr_bitmap)))
 110
 111 #endif /* CONFIG_DISCONTIGMEM */
 112
 113 #endif /* !__ASSEMBLY__ */
 114 #endif /* __KERNEL__ */
 115 #endif /* _LINUX_MMZONE_H */