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 /*
  26  * node_bootmem_map is a map pointer - the bits represent all physical
  27  * memory pages (including holes) on the node.
  28  */
  29 typedef struct bootmem_data {
  30         unsigned long node_boot_start;
  31         unsigned long node_low_pfn;
  32         void *node_bootmem_map;
  33         unsigned long last_offset;
  34         unsigned long last_pos;
  35         unsigned long last_success;     /* Previous allocation point.  To speed
  36                                          * up searching */
  37 } bootmem_data_t;
  38
  39 extern unsigned long __init bootmem_bootmap_pages (unsigned long);
  40 extern unsigned long __init init_bootmem (unsigned long addr, unsigned long memend);
  41 extern void __init free_bootmem (unsigned long addr, unsigned long size);
  42 extern void * __init __alloc_bootmem (unsigned long size, unsigned long align, unsigned long goal);
  43 #ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
  44 extern void __init reserve_bootmem (unsigned long addr, unsigned long size);
  45 #define alloc_bootmem(x) \
  46         __alloc_bootmem((x), SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
  47 #define alloc_bootmem_low(x) \
  48         __alloc_bootmem((x), SMP_CACHE_BYTES, 0)
  49 #define alloc_bootmem_pages(x) \
  50         __alloc_bootmem((x), PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
  51 #define alloc_bootmem_low_pages(x) \
  52         __alloc_bootmem((x), PAGE_SIZE, 0)
  53 #endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
  54 extern unsigned long __init free_all_bootmem (void);
  55
  56 extern unsigned long __init init_bootmem_node (pg_data_t *pgdat, unsigned long freepfn, unsigned long startpfn, unsigned long endpfn);
  57 extern void __init reserve_bootmem_node (pg_data_t *pgdat, unsigned long physaddr, unsigned long size);
  58 extern void __init free_bootmem_node (pg_data_t *pgdat, unsigned long addr, unsigned long size);
  59 extern unsigned long __init free_all_bootmem_node (pg_data_t *pgdat);
  60 extern void * __init __alloc_bootmem_node (pg_data_t *pgdat, unsigned long size, unsigned long align, unsigned long goal);
  61 #ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
  62 #define alloc_bootmem_node(pgdat, x) \
  63         __alloc_bootmem_node((pgdat), (x), SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
  64 #define alloc_bootmem_pages_node(pgdat, x) \
  65         __alloc_bootmem_node((pgdat), (x), PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
  66 #define alloc_bootmem_low_pages_node(pgdat, x) \
  67         __alloc_bootmem_node((pgdat), (x), PAGE_SIZE, 0)
  68 #endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
  69
  70 extern unsigned long __initdata nr_kernel_pages;
  71 extern unsigned long __initdata nr_all_pages;
  72
  73 extern void *__init alloc_large_system_hash(const char *tablename,
  74                                             unsigned long bucketsize,
  75                                             unsigned long numentries,
  76                                             int scale,
  77                                             int flags,
  78                                             unsigned int *_hash_shift,
  79                                             unsigned int *_hash_mask,
  80                                             unsigned long limit);
  81
  82 #define HASH_HIGHMEM    0x00000001      /* Consider highmem? */
  83 #define HASH_EARLY      0x00000002      /* Allocating during early boot? */
  84
  85 /* Only NUMA needs hash distribution.
  86  * IA64 is known to have sufficient vmalloc space.
  87  */
  88 #if defined(CONFIG_NUMA) && defined(CONFIG_IA64)
  89 #define HASHDIST_DEFAULT 1
  90 #else
  91 #define HASHDIST_DEFAULT 0
  92 #endif
  93 extern int __initdata hashdist;         /* Distribute hashes across NUMA nodes? */
  94
  95
  96 #endif /* _LINUX_BOOTMEM_H */