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 physaddr, unsigned long size);
  55extern void free_bootmem_late(unsigned long physaddr, unsigned long size);
  56extern void __free_pages_bootmem(struct page *page, unsigned int order);
  57
  58/*
  59 * Flags for reserve_bootmem (also if CONFIG_HAVE_ARCH_BOOTMEM_NODE,
  60 * the architecture-specific code should honor this).
  61 *
  62 * If flags is 0, then the return value is always 0 (success). If
  63 * flags contains BOOTMEM_EXCLUSIVE, then -EBUSY is returned if the
  64 * memory already was reserved.
  65 */
  66#define BOOTMEM_DEFAULT         0
  67#define BOOTMEM_EXCLUSIVE       (1<<0)
  68
  69extern int reserve_bootmem(unsigned long addr,
  70                           unsigned long size,
  71                           int flags);
  72extern int reserve_bootmem_node(pg_data_t *pgdat,
  73                                unsigned long physaddr,
  74                                unsigned long size,
  75                                int flags);
  76
  77extern void *__alloc_bootmem(unsigned long size,
  78                             unsigned long align,
  79                             unsigned long goal);
  80extern void *__alloc_bootmem_nopanic(unsigned long size,
  81                                     unsigned long align,
  82                                     unsigned long goal);
  83extern void *__alloc_bootmem_node(pg_data_t *pgdat,
  84                                  unsigned long size,
  85                                  unsigned long align,
  86                                  unsigned long goal);
  87void *__alloc_bootmem_node_high(pg_data_t *pgdat,
  88                                  unsigned long size,
  89                                  unsigned long align,
  90                                  unsigned long goal);
  91extern void *__alloc_bootmem_node_nopanic(pg_data_t *pgdat,
  92                                  unsigned long size,
  93                                  unsigned long align,
  94                                  unsigned long goal);
  95void *___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
  96                                  unsigned long size,
  97                                  unsigned long align,
  98                                  unsigned long goal,
  99                                  unsigned long limit);
 100extern void *__alloc_bootmem_low(unsigned long size,
 101                                 unsigned long align,
 102                                 unsigned long goal);
 103void *__alloc_bootmem_low_nopanic(unsigned long size,
 104                                 unsigned long align,
 105                                 unsigned long goal);
 106extern void *__alloc_bootmem_low_node(pg_data_t *pgdat,
 107                                      unsigned long size,
 108                                      unsigned long align,
 109                                      unsigned long goal);
 110
 111#ifdef CONFIG_NO_BOOTMEM
 112/* We are using top down, so it is safe to use 0 here */
 113#define BOOTMEM_LOW_LIMIT 0
 114#else
 115#define BOOTMEM_LOW_LIMIT __pa(MAX_DMA_ADDRESS)
 116#endif
 117
 118#define alloc_bootmem(x) \
 119        __alloc_bootmem(x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT)
 120#define alloc_bootmem_align(x, align) \
 121        __alloc_bootmem(x, align, BOOTMEM_LOW_LIMIT)
 122#define alloc_bootmem_nopanic(x) \
 123        __alloc_bootmem_nopanic(x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT)
 124#define alloc_bootmem_pages(x) \
 125        __alloc_bootmem(x, PAGE_SIZE, BOOTMEM_LOW_LIMIT)
 126#define alloc_bootmem_pages_nopanic(x) \
 127        __alloc_bootmem_nopanic(x, PAGE_SIZE, BOOTMEM_LOW_LIMIT)
 128#define alloc_bootmem_node(pgdat, x) \
 129        __alloc_bootmem_node(pgdat, x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT)
 130#define alloc_bootmem_node_nopanic(pgdat, x) \
 131        __alloc_bootmem_node_nopanic(pgdat, x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT)
 132#define alloc_bootmem_pages_node(pgdat, x) \
 133        __alloc_bootmem_node(pgdat, x, PAGE_SIZE, BOOTMEM_LOW_LIMIT)
 134#define alloc_bootmem_pages_node_nopanic(pgdat, x) \
 135        __alloc_bootmem_node_nopanic(pgdat, x, PAGE_SIZE, BOOTMEM_LOW_LIMIT)
 136
 137#define alloc_bootmem_low(x) \
 138        __alloc_bootmem_low(x, SMP_CACHE_BYTES, 0)
 139#define alloc_bootmem_low_pages_nopanic(x) \
 140        __alloc_bootmem_low_nopanic(x, PAGE_SIZE, 0)
 141#define alloc_bootmem_low_pages(x) \
 142        __alloc_bootmem_low(x, PAGE_SIZE, 0)
 143#define alloc_bootmem_low_pages_node(pgdat, x) \
 144        __alloc_bootmem_low_node(pgdat, x, PAGE_SIZE, 0)
 145
 146#ifdef CONFIG_HAVE_ARCH_ALLOC_REMAP
 147extern void *alloc_remap(int nid, unsigned long size);
 148#else
 149static inline void *alloc_remap(int nid, unsigned long size)
 150{
 151        return NULL;
 152}
 153#endif /* CONFIG_HAVE_ARCH_ALLOC_REMAP */
 154
 155extern void *alloc_large_system_hash(const char *tablename,
 156                                     unsigned long bucketsize,
 157                                     unsigned long numentries,
 158                                     int scale,
 159                                     int flags,
 160                                     unsigned int *_hash_shift,
 161                                     unsigned int *_hash_mask,
 162                                     unsigned long low_limit,
 163                                     unsigned long high_limit);
 164
 165#define HASH_EARLY      0x00000001      /* Allocating during early boot? */
 166#define HASH_SMALL      0x00000002      /* sub-page allocation allowed, min
 167                                         * shift passed via *_hash_shift */
 168
 169/* Only NUMA needs hash distribution. 64bit NUMA architectures have
 170 * sufficient vmalloc space.
 171 */
 172#if defined(CONFIG_NUMA) && defined(CONFIG_64BIT)
 173#define HASHDIST_DEFAULT 1
 174#else
 175#define HASHDIST_DEFAULT 0
 176#endif
 177extern int hashdist;            /* Distribute hashes across NUMA nodes? */
 178
 179
 180#endif /* _LINUX_BOOTMEM_H */
 181
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