include/linux/bootmem.h

   1 /*
   2  * Discontiguous memory support, Kanoj Sarcar, SGI, Nov 1999
   3  */
   4 #ifndef _LINUX_BOOTMEM_H
   5 #define _LINUX_BOOTMEM_H
   6
   7 #include <asm/pgtable.h>
   8 #include <asm/dma.h>
   9 #include <linux/cache.h>
  10 #include <linux/init.h>
  11 #include <linux/mmzone.h>
  12
  13 /*
  14  *  simple boot-time physical memory area allocator.
  15  */
  16
  17 extern unsigned long max_low_pfn;
  18 extern unsigned long min_low_pfn;
  19
  20 /*
  21  * highest page
  22  */
  23 extern unsigned long max_pfn;
  24
  25 #ifdef CONFIG_CRASH_DUMP
  26 extern unsigned long saved_max_pfn;
  27 #endif
  28
  29 /*
  30  * node_bootmem_map is a map pointer - the bits represent all physical
  31  * memory pages (including holes) on the node.
  32  */
  33 typedef struct bootmem_data {
  34         unsigned long node_boot_start;
  35         unsigned long node_low_pfn;
  36         void *node_bootmem_map;
  37         unsigned long last_offset;
  38         unsigned long last_pos;
  39         unsigned long last_success;     /* Previous allocation point.  To speed
  40                                          * up searching */
  41         struct list_head list;
  42 } bootmem_data_t;
  43
  44 extern unsigned long __init bootmem_bootmap_pages (unsigned long);
  45 extern unsigned long __init init_bootmem (unsigned long addr, unsigned long memend);
  46 extern void __init free_bootmem (unsigned long addr, unsigned long size);
  47 extern void * __init __alloc_bootmem (unsigned long size, unsigned long align, unsigned long goal);
  48 extern void * __init __alloc_bootmem_low(unsigned long size,
  49                                          unsigned long align,
  50                                          unsigned long goal);
  51 extern void * __init __alloc_bootmem_low_node(pg_data_t *pgdat,
  52                                               unsigned long size,
  53                                               unsigned long align,
  54                                               unsigned long goal);
  55 extern void * __init __alloc_bootmem_core(struct bootmem_data *bdata,
  56                 unsigned long size, unsigned long align, unsigned long goal,
  57                 unsigned long limit);
  58 #ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
  59 extern void __init reserve_bootmem (unsigned long addr, unsigned long size);
  60 #define alloc_bootmem(x) \
  61         __alloc_bootmem((x), SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
  62 #define alloc_bootmem_low(x) \
  63         __alloc_bootmem_low((x), SMP_CACHE_BYTES, 0)
  64 #define alloc_bootmem_pages(x) \
  65         __alloc_bootmem((x), PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
  66 #define alloc_bootmem_low_pages(x) \
  67         __alloc_bootmem_low((x), PAGE_SIZE, 0)
  68 #endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
  69 extern unsigned long __init free_all_bootmem (void);
  70 extern void * __init __alloc_bootmem_node (pg_data_t *pgdat, unsigned long size, unsigned long align, unsigned long goal);
  71 extern unsigned long __init init_bootmem_node (pg_data_t *pgdat, unsigned long freepfn, unsigned long startpfn, unsigned long endpfn);
  72 extern void __init reserve_bootmem_node (pg_data_t *pgdat, unsigned long physaddr, unsigned long size);
  73 extern void __init free_bootmem_node (pg_data_t *pgdat, unsigned long addr, unsigned long size);
  74 extern unsigned long __init free_all_bootmem_node (pg_data_t *pgdat);
  75 #ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
  76 #define alloc_bootmem_node(pgdat, x) \
  77         __alloc_bootmem_node((pgdat), (x), SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
  78 #define alloc_bootmem_pages_node(pgdat, x) \
  79         __alloc_bootmem_node((pgdat), (x), PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
  80 #define alloc_bootmem_low_pages_node(pgdat, x) \
  81         __alloc_bootmem_low_node((pgdat), (x), PAGE_SIZE, 0)
  82 #endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
  83
  84 #ifdef CONFIG_HAVE_ARCH_ALLOC_REMAP
  85 extern void *alloc_remap(int nid, unsigned long size);
  86 #else
  87 static inline void *alloc_remap(int nid, unsigned long size)
  88 {
  89         return NULL;
  90 }
  91 #endif
  92
  93 extern unsigned long __initdata nr_kernel_pages;
  94 extern unsigned long __initdata nr_all_pages;
  95
  96 extern void *__init alloc_large_system_hash(const char *tablename,
  97                                             unsigned long bucketsize,
  98                                             unsigned long numentries,
  99                                             int scale,
 100                                             int flags,
 101                                             unsigned int *_hash_shift,
 102                                             unsigned int *_hash_mask,
 103                                             unsigned long limit);
 104
 105 #define HASH_HIGHMEM    0x00000001      /* Consider highmem? */
 106 #define HASH_EARLY      0x00000002      /* Allocating during early boot? */
 107
 108 /* Only NUMA needs hash distribution.
 109  * IA64 is known to have sufficient vmalloc space.
 110  */
 111 #if defined(CONFIG_NUMA) && defined(CONFIG_IA64)
 112 #define HASHDIST_DEFAULT 1
 113 #else
 114 #define HASHDIST_DEFAULT 0
 115 #endif
 116 extern int __initdata hashdist;         /* Distribute hashes across NUMA nodes? */
 117
 118
 119 #endif /* _LINUX_BOOTMEM_H */