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#ifdef CONFIG_CRASH_DUMP
  23extern 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 */
  30typedef 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
  41extern unsigned long bootmem_bootmap_pages(unsigned long);
  42extern unsigned long init_bootmem(unsigned long addr, unsigned long memend);
  43extern void free_bootmem(unsigned long addr, unsigned long size);
  44extern void *__alloc_bootmem(unsigned long size,
  45                             unsigned long align,
  46                             unsigned long goal);
  47extern void *__alloc_bootmem_nopanic(unsigned long size,
  48                                     unsigned long align,
  49                                     unsigned long goal);
  50extern void *__alloc_bootmem_low(unsigned long size,
  51                                 unsigned long align,
  52                                 unsigned long goal);
  53extern void *__alloc_bootmem_low_node(pg_data_t *pgdat,
  54                                      unsigned long size,
  55                                      unsigned long align,
  56                                      unsigned long goal);
  57extern 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
  63/*
  64 * flags for reserve_bootmem (also if CONFIG_HAVE_ARCH_BOOTMEM_NODE,
  65 * the architecture-specific code should honor this)
  66 */
  67#define BOOTMEM_DEFAULT         0
  68#define BOOTMEM_EXCLUSIVE       (1<<0)
  69
  70#ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
  71/*
  72 * If flags is 0, then the return value is always 0 (success). If
  73 * flags contains BOOTMEM_EXCLUSIVE, then -EBUSY is returned if the
  74 * memory already was reserved.
  75 */
  76extern int reserve_bootmem(unsigned long addr, unsigned long size, int flags);
  77#define alloc_bootmem(x) \
  78        __alloc_bootmem(x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
  79#define alloc_bootmem_low(x) \
  80        __alloc_bootmem_low(x, SMP_CACHE_BYTES, 0)
  81#define alloc_bootmem_pages(x) \
  82        __alloc_bootmem(x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
  83#define alloc_bootmem_low_pages(x) \
  84        __alloc_bootmem_low(x, PAGE_SIZE, 0)
  85#endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
  86
  87extern unsigned long free_all_bootmem(void);
  88extern unsigned long free_all_bootmem_node(pg_data_t *pgdat);
  89extern void *__alloc_bootmem_node(pg_data_t *pgdat,
  90                                  unsigned long size,
  91                                  unsigned long align,
  92                                  unsigned long goal);
  93extern unsigned long init_bootmem_node(pg_data_t *pgdat,
  94                                       unsigned long freepfn,
  95                                       unsigned long startpfn,
  96                                       unsigned long endpfn);
  97extern void reserve_bootmem_node(pg_data_t *pgdat,
  98                                 unsigned long physaddr,
  99                                 unsigned long size,
 100                                 int flags);
 101extern void free_bootmem_node(pg_data_t *pgdat,
 102                              unsigned long addr,
 103                              unsigned long size);
 104
 105#ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
 106#define alloc_bootmem_node(pgdat, x) \
 107        __alloc_bootmem_node(pgdat, x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
 108#define alloc_bootmem_pages_node(pgdat, x) \
 109        __alloc_bootmem_node(pgdat, x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
 110#define alloc_bootmem_low_pages_node(pgdat, x) \
 111        __alloc_bootmem_low_node(pgdat, x, PAGE_SIZE, 0)
 112#endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
 113
 114#ifdef CONFIG_HAVE_ARCH_ALLOC_REMAP
 115extern void *alloc_remap(int nid, unsigned long size);
 116#else
 117static inline void *alloc_remap(int nid, unsigned long size)
 118{
 119        return NULL;
 120}
 121#endif /* CONFIG_HAVE_ARCH_ALLOC_REMAP */
 122
 123extern unsigned long __meminitdata nr_kernel_pages;
 124extern unsigned long __meminitdata nr_all_pages;
 125
 126extern void *alloc_large_system_hash(const char *tablename,
 127                                     unsigned long bucketsize,
 128                                     unsigned long numentries,
 129                                     int scale,
 130                                     int flags,
 131                                     unsigned int *_hash_shift,
 132                                     unsigned int *_hash_mask,
 133                                     unsigned long limit);
 134
 135#define HASH_EARLY      0x00000001      /* Allocating during early boot? */
 136
 137/* Only NUMA needs hash distribution.
 138 * IA64 and x86_64 have sufficient vmalloc space.
 139 */
 140#if defined(CONFIG_NUMA) && (defined(CONFIG_IA64) || defined(CONFIG_X86_64))
 141#define HASHDIST_DEFAULT 1
 142#else
 143#define HASHDIST_DEFAULT 0
 144#endif
 145extern int hashdist;            /* Distribute hashes across NUMA nodes? */
 146
 147
 148#endif /* _LINUX_BOOTMEM_H */
 149