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 <linux/mmzone.h>
   8 #include <asm/dma.h>
   9
  10 /*
  11  *  simple boot-time physical memory area allocator.
  12  */
  13
  14 extern unsigned long max_low_pfn;
  15 extern unsigned long min_low_pfn;
  16
  17 /*
  18  * highest page
  19  */
  20 extern unsigned long max_pfn;
  21
  22 #ifdef CONFIG_CRASH_DUMP
  23 extern unsigned long saved_max_pfn;
  24 #endif
  25
  26 /*
  27  * node_bootmem_map is a map pointer - the bits represent all physical
  28  * memory pages (including holes) on the node.
  29  */
  30 typedef struct bootmem_data {
  31         unsigned long node_boot_start;
  32         unsigned long node_low_pfn;
  33         void *node_bootmem_map;
  34         unsigned long last_offset;
  35         unsigned long last_pos;
  36         unsigned long last_success;     /* Previous allocation point.  To speed
  37                                          * up searching */
  38         struct list_head list;
  39 } bootmem_data_t;
  40
  41 extern unsigned long bootmem_bootmap_pages(unsigned long);
  42 extern unsigned long init_bootmem(unsigned long addr, unsigned long memend);
  43 extern void free_bootmem(unsigned long addr, unsigned long size);
  44 extern void *__alloc_bootmem(unsigned long size,
  45                              unsigned long align,
  46                              unsigned long goal);
  47 extern void *__alloc_bootmem_nopanic(unsigned long size,
  48                                      unsigned long align,
  49                                      unsigned long goal);
  50 extern void *__alloc_bootmem_low(unsigned long size,
  51                                  unsigned long align,
  52                                  unsigned long goal);
  53 extern void *__alloc_bootmem_low_node(pg_data_t *pgdat,
  54                                       unsigned long size,
  55                                       unsigned long align,
  56                                       unsigned long goal);
  57 extern void *__alloc_bootmem_core(struct bootmem_data *bdata,
  58                                   unsigned long size,
  59                                   unsigned long align,
  60                                   unsigned long goal,
  61                                   unsigned long limit);
  62 extern void *alloc_bootmem_high_node(pg_data_t *pgdat, unsigned long size);
  63
  64 #ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
  65 extern void reserve_bootmem(unsigned long addr, unsigned long size);
  66 #define alloc_bootmem(x) \
  67         __alloc_bootmem(x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
  68 #define alloc_bootmem_low(x) \
  69         __alloc_bootmem_low(x, SMP_CACHE_BYTES, 0)
  70 #define alloc_bootmem_pages(x) \
  71         __alloc_bootmem(x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
  72 #define alloc_bootmem_low_pages(x) \
  73         __alloc_bootmem_low(x, PAGE_SIZE, 0)
  74 #endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
  75
  76 extern unsigned long free_all_bootmem(void);
  77 extern unsigned long free_all_bootmem_node(pg_data_t *pgdat);
  78 extern void *__alloc_bootmem_node(pg_data_t *pgdat,
  79                                   unsigned long size,
  80                                   unsigned long align,
  81                                   unsigned long goal);
  82 extern unsigned long init_bootmem_node(pg_data_t *pgdat,
  83                                        unsigned long freepfn,
  84                                        unsigned long startpfn,
  85                                        unsigned long endpfn);
  86 extern void reserve_bootmem_node(pg_data_t *pgdat,
  87                                  unsigned long physaddr,
  88                                  unsigned long size);
  89 extern void free_bootmem_node(pg_data_t *pgdat,
  90                               unsigned long addr,
  91                               unsigned long size);
  92
  93 #ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
  94 #define alloc_bootmem_node(pgdat, x) \
  95         __alloc_bootmem_node(pgdat, x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
  96 #define alloc_bootmem_pages_node(pgdat, x) \
  97         __alloc_bootmem_node(pgdat, x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
  98 #define alloc_bootmem_low_pages_node(pgdat, x) \
  99         __alloc_bootmem_low_node(pgdat, x, PAGE_SIZE, 0)
 100 #endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
 101
 102 #ifdef CONFIG_HAVE_ARCH_ALLOC_REMAP
 103 extern void *alloc_remap(int nid, unsigned long size);
 104 #else
 105 static inline void *alloc_remap(int nid, unsigned long size)
 106 {
 107         return NULL;
 108 }
 109 #endif /* CONFIG_HAVE_ARCH_ALLOC_REMAP */
 110
 111 extern unsigned long __meminitdata nr_kernel_pages;
 112 extern unsigned long __meminitdata nr_all_pages;
 113
 114 extern void *alloc_large_system_hash(const char *tablename,
 115                                      unsigned long bucketsize,
 116                                      unsigned long numentries,
 117                                      int scale,
 118                                      int flags,
 119                                      unsigned int *_hash_shift,
 120                                      unsigned int *_hash_mask,
 121                                      unsigned long limit);
 122
 123 #define HASH_EARLY      0x00000001      /* Allocating during early boot? */
 124
 125 /* Only NUMA needs hash distribution.
 126  * IA64 and x86_64 have sufficient vmalloc space.
 127  */
 128 #if defined(CONFIG_NUMA) && (defined(CONFIG_IA64) || defined(CONFIG_X86_64))
 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 */