LXR linux/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
  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_all_bootmem(void);
  48extern void reset_all_zones_managed_pages(void);
  49
  50extern void free_bootmem_node(pg_data_t *pgdat,
  51                              unsigned long addr,
  52                              unsigned long size);
  53extern void free_bootmem(unsigned long physaddr, unsigned long size);
  54extern void free_bootmem_late(unsigned long physaddr, unsigned long size);
  55extern void __free_pages_bootmem(struct page *page, unsigned int order);
  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);
 102void *__alloc_bootmem_low_nopanic(unsigned long size,
 103                                 unsigned long align,
 104                                 unsigned long goal);
 105extern void *__alloc_bootmem_low_node(pg_data_t *pgdat,
 106                                      unsigned long size,
 107                                      unsigned long align,
 108                                      unsigned long goal);
 109
 110#ifdef CONFIG_NO_BOOTMEM
 111/* We are using top down, so it is safe to use 0 here */
 112#define BOOTMEM_LOW_LIMIT 0
 113#else
 114#define BOOTMEM_LOW_LIMIT __pa(MAX_DMA_ADDRESS)
 115#endif
 116
 117#define alloc_bootmem(x) \
 118        __alloc_bootmem(x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT)
 119#define alloc_bootmem_align(x, align) \
 120        __alloc_bootmem(x, align, BOOTMEM_LOW_LIMIT)
 121#define alloc_bootmem_nopanic(x) \
 122        __alloc_bootmem_nopanic(x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT)
 123#define alloc_bootmem_pages(x) \
 124        __alloc_bootmem(x, PAGE_SIZE, BOOTMEM_LOW_LIMIT)
 125#define alloc_bootmem_pages_nopanic(x) \
 126        __alloc_bootmem_nopanic(x, PAGE_SIZE, BOOTMEM_LOW_LIMIT)
 127#define alloc_bootmem_node(pgdat, x) \
 128        __alloc_bootmem_node(pgdat, x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT)
 129#define alloc_bootmem_node_nopanic(pgdat, x) \
 130        __alloc_bootmem_node_nopanic(pgdat, x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT)
 131#define alloc_bootmem_pages_node(pgdat, x) \
 132        __alloc_bootmem_node(pgdat, x, PAGE_SIZE, BOOTMEM_LOW_LIMIT)
 133#define alloc_bootmem_pages_node_nopanic(pgdat, x) \
 134        __alloc_bootmem_node_nopanic(pgdat, x, PAGE_SIZE, BOOTMEM_LOW_LIMIT)
 135
 136#define alloc_bootmem_low(x) \
 137        __alloc_bootmem_low(x, SMP_CACHE_BYTES, 0)
 138#define alloc_bootmem_low_pages_nopanic(x) \
 139        __alloc_bootmem_low_nopanic(x, PAGE_SIZE, 0)
 140#define alloc_bootmem_low_pages(x) \
 141        __alloc_bootmem_low(x, PAGE_SIZE, 0)
 142#define alloc_bootmem_low_pages_node(pgdat, x) \
 143        __alloc_bootmem_low_node(pgdat, x, PAGE_SIZE, 0)
 144
 145#ifdef CONFIG_HAVE_ARCH_ALLOC_REMAP
 146extern void *alloc_remap(int nid, unsigned long size);
 147#else
 148static inline void *alloc_remap(int nid, unsigned long size)
 149{
 150        return NULL;
 151}
 152#endif /* CONFIG_HAVE_ARCH_ALLOC_REMAP */
 153
 154extern void *alloc_large_system_hash(const char *tablename,
 155                                     unsigned long bucketsize,
 156                                     unsigned long numentries,
 157                                     int scale,
 158                                     int flags,
 159                                     unsigned int *_hash_shift,
 160                                     unsigned int *_hash_mask,
 161                                     unsigned long low_limit,
 162                                     unsigned long high_limit);
 163
 164#define HASH_EARLY      0x00000001      /* Allocating during early boot? */
 165#define HASH_SMALL      0x00000002      /* sub-page allocation allowed, min
 166                                         * shift passed via *_hash_shift */
 167
 168/* Only NUMA needs hash distribution. 64bit NUMA architectures have
 169 * sufficient vmalloc space.
 170 */
 171#if defined(CONFIG_NUMA) && defined(CONFIG_64BIT)
 172#define HASHDIST_DEFAULT 1
 173#else
 174#define HASHDIST_DEFAULT 0
 175#endif
 176extern int hashdist;            /* Distribute hashes across NUMA nodes? */
 177
 178
 179#endif /* _LINUX_BOOTMEM_H */
 180