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 bootmem_data_t bootmem_node_data[];
  42
  43 extern unsigned long bootmem_bootmap_pages(unsigned long);
  44
  45 extern unsigned long init_bootmem_node(pg_data_t *pgdat,
  46                                        unsigned long freepfn,
  47                                        unsigned long startpfn,
  48                                        unsigned long endpfn);
  49 extern unsigned long init_bootmem(unsigned long addr, unsigned long memend);
  50
  51 extern unsigned long free_all_bootmem_node(pg_data_t *pgdat);
  52 extern unsigned long free_all_bootmem(void);
  53
  54 extern void free_bootmem_node(pg_data_t *pgdat,
  55                               unsigned long addr,
  56                               unsigned long size);
  57 extern void free_bootmem(unsigned long addr, unsigned long size);
  58
  59 /*
  60  * Flags for reserve_bootmem (also if CONFIG_HAVE_ARCH_BOOTMEM_NODE,
  61  * the architecture-specific code should honor this).
  62  *
  63  * If flags is 0, then the return value is always 0 (success). If
  64  * flags contains BOOTMEM_EXCLUSIVE, then -EBUSY is returned if the
  65  * memory already was reserved.
  66  */
  67 #define BOOTMEM_DEFAULT         0
  68 #define BOOTMEM_EXCLUSIVE       (1<<0)
  69
  70 extern int reserve_bootmem_node(pg_data_t *pgdat,
  71                                  unsigned long physaddr,
  72                                  unsigned long size,
  73                                  int flags);
  74 #ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
  75 extern int reserve_bootmem(unsigned long addr, unsigned long size, int flags);
  76 #endif
  77
  78 extern void *__alloc_bootmem_nopanic(unsigned long size,
  79                              unsigned long align,
  80                              unsigned long goal);
  81 extern void *__alloc_bootmem(unsigned long size,
  82                                      unsigned long align,
  83                                      unsigned long goal);
  84 extern void *__alloc_bootmem_low(unsigned long size,
  85                                  unsigned long align,
  86                                  unsigned long goal);
  87 extern void *__alloc_bootmem_node(pg_data_t *pgdat,
  88                                   unsigned long size,
  89                                   unsigned long align,
  90                                   unsigned long goal);
  91 extern void *__alloc_bootmem_node_nopanic(pg_data_t *pgdat,
  92                                   unsigned long size,
  93                                   unsigned long align,
  94                                   unsigned long goal);
  95 extern void *__alloc_bootmem_low_node(pg_data_t *pgdat,
  96                                       unsigned long size,
  97                                       unsigned long align,
  98                                       unsigned long goal);
  99 #ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
 100 #define alloc_bootmem(x) \
 101         __alloc_bootmem(x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
 102 #define alloc_bootmem_low(x) \
 103         __alloc_bootmem_low(x, SMP_CACHE_BYTES, 0)
 104 #define alloc_bootmem_pages(x) \
 105         __alloc_bootmem(x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
 106 #define alloc_bootmem_low_pages(x) \
 107         __alloc_bootmem_low(x, PAGE_SIZE, 0)
 108 #endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
 109
 110 extern int reserve_bootmem_generic(unsigned long addr, unsigned long size,
 111                                    int flags);
 112
 113 #define alloc_bootmem_node(pgdat, x) \
 114         __alloc_bootmem_node(pgdat, x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
 115 #define alloc_bootmem_pages_node(pgdat, x) \
 116         __alloc_bootmem_node(pgdat, x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
 117 #define alloc_bootmem_low_pages_node(pgdat, x) \
 118         __alloc_bootmem_low_node(pgdat, x, PAGE_SIZE, 0)
 119
 120 extern void *alloc_bootmem_section(unsigned long size,
 121                                    unsigned long section_nr);
 122
 123 #ifdef CONFIG_HAVE_ARCH_ALLOC_REMAP
 124 extern void *alloc_remap(int nid, unsigned long size);
 125 #else
 126 static inline void *alloc_remap(int nid, unsigned long size)
 127 {
 128         return NULL;
 129 }
 130 #endif /* CONFIG_HAVE_ARCH_ALLOC_REMAP */
 131
 132 extern unsigned long __meminitdata nr_kernel_pages;
 133 extern unsigned long __meminitdata nr_all_pages;
 134
 135 extern void *alloc_large_system_hash(const char *tablename,
 136                                      unsigned long bucketsize,
 137                                      unsigned long numentries,
 138                                      int scale,
 139                                      int flags,
 140                                      unsigned int *_hash_shift,
 141                                      unsigned int *_hash_mask,
 142                                      unsigned long limit);
 143
 144 #define HASH_EARLY      0x00000001      /* Allocating during early boot? */
 145
 146 /* Only NUMA needs hash distribution.
 147  * IA64 and x86_64 have sufficient vmalloc space.
 148  */
 149 #if defined(CONFIG_NUMA) && (defined(CONFIG_IA64) || defined(CONFIG_X86_64))
 150 #define HASHDIST_DEFAULT 1
 151 #else
 152 #define HASHDIST_DEFAULT 0
 153 #endif
 154 extern int hashdist;            /* Distribute hashes across NUMA nodes? */
 155
 156
 157 #endif /* _LINUX_BOOTMEM_H */