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 bootmem_bootmap_pages (unsigned long);
  45 extern unsigned long init_bootmem (unsigned long addr, unsigned long memend);
  46 extern void free_bootmem (unsigned long addr, unsigned long size);
  47 extern void * __alloc_bootmem (unsigned long size,
  48                                unsigned long align,
  49                                unsigned long goal);
  50 extern void * __alloc_bootmem_nopanic (unsigned long size,
  51                                        unsigned long align,
  52                                        unsigned long goal);
  53 extern void * __alloc_bootmem_low(unsigned long size,
  54                                   unsigned long align,
  55                                   unsigned long goal);
  56 extern void * __alloc_bootmem_low_node(pg_data_t *pgdat,
  57                                        unsigned long size,
  58                                        unsigned long align,
  59                                        unsigned long goal);
  60 extern void * __alloc_bootmem_core(struct bootmem_data *bdata,
  61                                    unsigned long size,
  62                                    unsigned long align,
  63                                    unsigned long goal,
  64                                    unsigned long limit);
  65 #ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
  66 extern void reserve_bootmem (unsigned long addr, unsigned long size);
  67 #define alloc_bootmem(x) \
  68         __alloc_bootmem(x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
  69 #define alloc_bootmem_low(x) \
  70         __alloc_bootmem_low(x, SMP_CACHE_BYTES, 0)
  71 #define alloc_bootmem_pages(x) \
  72         __alloc_bootmem(x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
  73 #define alloc_bootmem_low_pages(x) \
  74         __alloc_bootmem_low(x, PAGE_SIZE, 0)
  75 #endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
  76 extern unsigned long free_all_bootmem (void);
  77 extern void * __alloc_bootmem_node (pg_data_t *pgdat,
  78                                     unsigned long size,
  79                                     unsigned long align,
  80                                     unsigned long goal);
  81 extern unsigned long init_bootmem_node (pg_data_t *pgdat,
  82                                         unsigned long freepfn,
  83                                         unsigned long startpfn,
  84                                         unsigned long endpfn);
  85 extern void reserve_bootmem_node (pg_data_t *pgdat,
  86                                   unsigned long physaddr,
  87                                   unsigned long size);
  88 extern void free_bootmem_node (pg_data_t *pgdat,
  89                                unsigned long addr,
  90                                unsigned long size);
  91 extern unsigned long free_all_bootmem_node (pg_data_t *pgdat);
  92 #ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
  93 #define alloc_bootmem_node(pgdat, x) \
  94         __alloc_bootmem_node(pgdat, x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
  95 #define alloc_bootmem_pages_node(pgdat, x) \
  96         __alloc_bootmem_node(pgdat, x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
  97 #define alloc_bootmem_low_pages_node(pgdat, x) \
  98         __alloc_bootmem_low_node(pgdat, x, PAGE_SIZE, 0)
  99 #endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
 100
 101 #ifdef CONFIG_HAVE_ARCH_ALLOC_REMAP
 102 extern void *alloc_remap(int nid, unsigned long size);
 103 #else
 104 static inline void *alloc_remap(int nid, unsigned long size)
 105 {
 106         return NULL;
 107 }
 108 #endif
 109
 110 extern unsigned long __meminitdata nr_kernel_pages;
 111 extern unsigned long nr_all_pages;
 112
 113 extern void * alloc_large_system_hash(const char *tablename,
 114                                       unsigned long bucketsize,
 115                                       unsigned long numentries,
 116                                       int scale,
 117                                       int flags,
 118                                       unsigned int *_hash_shift,
 119                                       unsigned int *_hash_mask,
 120                                       unsigned long limit);
 121
 122 #define HASH_HIGHMEM    0x00000001      /* Consider highmem? */
 123 #define HASH_EARLY      0x00000002      /* Allocating during early boot? */
 124
 125 /* Only NUMA needs hash distribution.
 126  * IA64 is known to have sufficient vmalloc space.
 127  */
 128 #if defined(CONFIG_NUMA) && defined(CONFIG_IA64)
 129 #define HASHDIST_DEFAULT 1
 130 #else
 131 #define HASHDIST_DEFAULT 0
 132 #endif
 133 extern int hashdist;            /* Distribute hashes across NUMA nodes? */
 134
 135
 136 #endif /* _LINUX_BOOTMEM_H */