linux/include/linux/bootmem.h
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   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
  14extern unsigned long max_low_pfn;
  15extern unsigned long min_low_pfn;
  16
  17/*
  18 * highest page
  19 */
  20extern unsigned long max_pfn;
  21
  22#ifndef CONFIG_NO_BOOTMEM
  23/*
  24 * node_bootmem_map is a map pointer - the bits represent all physical 
  25 * memory pages (including holes) on the node.
  26 */
  27typedef struct bootmem_data {
  28        unsigned long node_min_pfn;
  29        unsigned long node_low_pfn;
  30        void *node_bootmem_map;
  31        unsigned long last_end_off;
  32        unsigned long hint_idx;
  33        struct list_head list;
  34} bootmem_data_t;
  35
  36extern bootmem_data_t bootmem_node_data[];
  37#endif
  38
  39extern unsigned long bootmem_bootmap_pages(unsigned long);
  40
  41extern unsigned long init_bootmem_node(pg_data_t *pgdat,
  42                                       unsigned long freepfn,
  43                                       unsigned long startpfn,
  44                                       unsigned long endpfn);
  45extern unsigned long init_bootmem(unsigned long addr, unsigned long memend);
  46
  47extern unsigned long free_low_memory_core_early(int nodeid);
  48extern unsigned long free_all_bootmem_node(pg_data_t *pgdat);
  49extern unsigned long free_all_bootmem(void);
  50
  51extern void free_bootmem_node(pg_data_t *pgdat,
  52                              unsigned long addr,
  53                              unsigned long size);
  54extern void free_bootmem(unsigned long addr, unsigned long size);
  55extern void free_bootmem_late(unsigned long addr, unsigned long size);
  56
  57/*
  58 * Flags for reserve_bootmem (also if CONFIG_HAVE_ARCH_BOOTMEM_NODE,
  59 * the architecture-specific code should honor this).
  60 *
  61 * If flags is 0, then the return value is always 0 (success). If
  62 * flags contains BOOTMEM_EXCLUSIVE, then -EBUSY is returned if the
  63 * memory already was reserved.
  64 */
  65#define BOOTMEM_DEFAULT         0
  66#define BOOTMEM_EXCLUSIVE       (1<<0)
  67
  68extern int reserve_bootmem(unsigned long addr,
  69                           unsigned long size,
  70                           int flags);
  71extern int reserve_bootmem_node(pg_data_t *pgdat,
  72                                unsigned long physaddr,
  73                                unsigned long size,
  74                                int flags);
  75
  76extern void *__alloc_bootmem(unsigned long size,
  77                             unsigned long align,
  78                             unsigned long goal);
  79extern void *__alloc_bootmem_nopanic(unsigned long size,
  80                                     unsigned long align,
  81                                     unsigned long goal);
  82extern void *__alloc_bootmem_node(pg_data_t *pgdat,
  83                                  unsigned long size,
  84                                  unsigned long align,
  85                                  unsigned long goal);
  86void *__alloc_bootmem_node_high(pg_data_t *pgdat,
  87                                  unsigned long size,
  88                                  unsigned long align,
  89                                  unsigned long goal);
  90extern void *__alloc_bootmem_node_nopanic(pg_data_t *pgdat,
  91                                  unsigned long size,
  92                                  unsigned long align,
  93                                  unsigned long goal);
  94void *___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
  95                                  unsigned long size,
  96                                  unsigned long align,
  97                                  unsigned long goal,
  98                                  unsigned long limit);
  99extern void *__alloc_bootmem_low(unsigned long size,
 100                                 unsigned long align,
 101                                 unsigned long goal);
 102extern void *__alloc_bootmem_low_node(pg_data_t *pgdat,
 103                                      unsigned long size,
 104                                      unsigned long align,
 105                                      unsigned long goal);
 106
 107#ifdef CONFIG_NO_BOOTMEM
 108/* We are using top down, so it is safe to use 0 here */
 109#define BOOTMEM_LOW_LIMIT 0
 110#else
 111#define BOOTMEM_LOW_LIMIT __pa(MAX_DMA_ADDRESS)
 112#endif
 113
 114#define alloc_bootmem(x) \
 115        __alloc_bootmem(x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT)
 116#define alloc_bootmem_align(x, align) \
 117        __alloc_bootmem(x, align, BOOTMEM_LOW_LIMIT)
 118#define alloc_bootmem_nopanic(x) \
 119        __alloc_bootmem_nopanic(x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT)
 120#define alloc_bootmem_pages(x) \
 121        __alloc_bootmem(x, PAGE_SIZE, BOOTMEM_LOW_LIMIT)
 122#define alloc_bootmem_pages_nopanic(x) \
 123        __alloc_bootmem_nopanic(x, PAGE_SIZE, BOOTMEM_LOW_LIMIT)
 124#define alloc_bootmem_node(pgdat, x) \
 125        __alloc_bootmem_node(pgdat, x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT)
 126#define alloc_bootmem_node_nopanic(pgdat, x) \
 127        __alloc_bootmem_node_nopanic(pgdat, x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT)
 128#define alloc_bootmem_pages_node(pgdat, x) \
 129        __alloc_bootmem_node(pgdat, x, PAGE_SIZE, BOOTMEM_LOW_LIMIT)
 130#define alloc_bootmem_pages_node_nopanic(pgdat, x) \
 131        __alloc_bootmem_node_nopanic(pgdat, x, PAGE_SIZE, BOOTMEM_LOW_LIMIT)
 132
 133#define alloc_bootmem_low(x) \
 134        __alloc_bootmem_low(x, SMP_CACHE_BYTES, 0)
 135#define alloc_bootmem_low_pages(x) \
 136        __alloc_bootmem_low(x, PAGE_SIZE, 0)
 137#define alloc_bootmem_low_pages_node(pgdat, x) \
 138        __alloc_bootmem_low_node(pgdat, x, PAGE_SIZE, 0)
 139
 140extern int reserve_bootmem_generic(unsigned long addr, unsigned long size,
 141                                   int flags);
 142
 143#ifdef CONFIG_HAVE_ARCH_ALLOC_REMAP
 144extern void *alloc_remap(int nid, unsigned long size);
 145#else
 146static inline void *alloc_remap(int nid, unsigned long size)
 147{
 148        return NULL;
 149}
 150#endif /* CONFIG_HAVE_ARCH_ALLOC_REMAP */
 151
 152extern void *alloc_large_system_hash(const char *tablename,
 153                                     unsigned long bucketsize,
 154                                     unsigned long numentries,
 155                                     int scale,
 156                                     int flags,
 157                                     unsigned int *_hash_shift,
 158                                     unsigned int *_hash_mask,
 159                                     unsigned long low_limit,
 160                                     unsigned long high_limit);
 161
 162#define HASH_EARLY      0x00000001      /* Allocating during early boot? */
 163#define HASH_SMALL      0x00000002      /* sub-page allocation allowed, min
 164                                         * shift passed via *_hash_shift */
 165
 166/* Only NUMA needs hash distribution. 64bit NUMA architectures have
 167 * sufficient vmalloc space.
 168 */
 169#if defined(CONFIG_NUMA) && defined(CONFIG_64BIT)
 170#define HASHDIST_DEFAULT 1
 171#else
 172#define HASHDIST_DEFAULT 0
 173#endif
 174extern int hashdist;            /* Distribute hashes across NUMA nodes? */
 175
 176
 177#endif /* _LINUX_BOOTMEM_H */
 178
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