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 } bootmem_data_t;
  42
  43 extern unsigned long __init bootmem_bootmap_pages (unsigned long);
  44 extern unsigned long __init init_bootmem (unsigned long addr, unsigned long memend);
  45 extern void __init free_bootmem (unsigned long addr, unsigned long size);
  46 extern void * __init __alloc_bootmem (unsigned long size, unsigned long align, unsigned long goal);
  47 #ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
  48 extern void __init reserve_bootmem (unsigned long addr, unsigned long size);
  49 #define alloc_bootmem(x) \
  50         __alloc_bootmem((x), SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
  51 #define alloc_bootmem_low(x) \
  52         __alloc_bootmem((x), SMP_CACHE_BYTES, 0)
  53 #define alloc_bootmem_pages(x) \
  54         __alloc_bootmem((x), PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
  55 #define alloc_bootmem_low_pages(x) \
  56         __alloc_bootmem((x), PAGE_SIZE, 0)
  57 #endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
  58 extern unsigned long __init free_all_bootmem (void);
  59
  60 extern unsigned long __init init_bootmem_node (pg_data_t *pgdat, unsigned long freepfn, unsigned long startpfn, unsigned long endpfn);
  61 extern void __init reserve_bootmem_node (pg_data_t *pgdat, unsigned long physaddr, unsigned long size);
  62 extern void __init free_bootmem_node (pg_data_t *pgdat, unsigned long addr, unsigned long size);
  63 extern unsigned long __init free_all_bootmem_node (pg_data_t *pgdat);
  64 extern void * __init __alloc_bootmem_node (pg_data_t *pgdat, unsigned long size, unsigned long align, unsigned long goal);
  65 #ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
  66 #define alloc_bootmem_node(pgdat, x) \
  67         __alloc_bootmem_node((pgdat), (x), SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
  68 #define alloc_bootmem_pages_node(pgdat, x) \
  69         __alloc_bootmem_node((pgdat), (x), PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
  70 #define alloc_bootmem_low_pages_node(pgdat, x) \
  71         __alloc_bootmem_node((pgdat), (x), PAGE_SIZE, 0)
  72 #endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
  73
  74 #ifdef CONFIG_HAVE_ARCH_ALLOC_REMAP
  75 extern void *alloc_remap(int nid, unsigned long size);
  76 #else
  77 static inline void *alloc_remap(int nid, unsigned long size)
  78 {
  79         return NULL;
  80 }
  81 #endif
  82
  83 extern unsigned long __initdata nr_kernel_pages;
  84 extern unsigned long __initdata nr_all_pages;
  85
  86 extern void *__init alloc_large_system_hash(const char *tablename,
  87                                             unsigned long bucketsize,
  88                                             unsigned long numentries,
  89                                             int scale,
  90                                             int flags,
  91                                             unsigned int *_hash_shift,
  92                                             unsigned int *_hash_mask,
  93                                             unsigned long limit);
  94
  95 #define HASH_HIGHMEM    0x00000001      /* Consider highmem? */
  96 #define HASH_EARLY      0x00000002      /* Allocating during early boot? */
  97
  98 /* Only NUMA needs hash distribution.
  99  * IA64 is known to have sufficient vmalloc space.
 100  */
 101 #if defined(CONFIG_NUMA) && defined(CONFIG_IA64)
 102 #define HASHDIST_DEFAULT 1
 103 #else
 104 #define HASHDIST_DEFAULT 0
 105 #endif
 106 extern int __initdata hashdist;         /* Distribute hashes across NUMA nodes? */
 107
 108
 109 #endif /* _LINUX_BOOTMEM_H */