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#ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
  64extern void reserve_bootmem(unsigned long addr, unsigned long size);
  65#define alloc_bootmem(x) \
  66        __alloc_bootmem(x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
  67#define alloc_bootmem_low(x) \
  68        __alloc_bootmem_low(x, SMP_CACHE_BYTES, 0)
  69#define alloc_bootmem_pages(x) \
  70        __alloc_bootmem(x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
  71#define alloc_bootmem_low_pages(x) \
  72        __alloc_bootmem_low(x, PAGE_SIZE, 0)
  73#endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
  74
  75extern unsigned long free_all_bootmem(void);
  76extern unsigned long free_all_bootmem_node(pg_data_t *pgdat);
  77extern void *__alloc_bootmem_node(pg_data_t *pgdat,
  78                                  unsigned long size,
  79                                  unsigned long align,
  80                                  unsigned long goal);
  81extern unsigned long init_bootmem_node(pg_data_t *pgdat,
  82                                       unsigned long freepfn,
  83                                       unsigned long startpfn,
  84                                       unsigned long endpfn);
  85extern void reserve_bootmem_node(pg_data_t *pgdat,
  86                                 unsigned long physaddr,
  87                                 unsigned long size);
  88extern void free_bootmem_node(pg_data_t *pgdat,
  89                              unsigned long addr,
  90                              unsigned long size);
  91
  92#ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
  93#define alloc_bootmem_node(pgdat, x) \
  94        __alloc_bootmem_node(pgdat, x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
  95#define alloc_bootmem_pages_node(pgdat, x) \
  96        __alloc_bootmem_node(pgdat, x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
  97#define alloc_bootmem_low_pages_node(pgdat, x) \
  98        __alloc_bootmem_low_node(pgdat, x, PAGE_SIZE, 0)
  99#endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
 100
 101#ifdef CONFIG_HAVE_ARCH_ALLOC_REMAP
 102extern void *alloc_remap(int nid, unsigned long size);
 103#else
 104static inline void *alloc_remap(int nid, unsigned long size)
 105{
 106        return NULL;
 107}
 108#endif /* CONFIG_HAVE_ARCH_ALLOC_REMAP */
 109
 110extern unsigned long __meminitdata nr_kernel_pages;
 111extern unsigned long __meminitdata nr_all_pages;
 112
 113extern void *alloc_large_system_hash(const char *tablename,
 114                                     unsigned long bucketsize,
 115                                     unsigned long numentries,
 116                                     int scale,
 117                                     int flags,
 118                                     unsigned int *_hash_shift,
 119                                     unsigned int *_hash_mask,
 120                                     unsigned long limit);
 121
 122#define HASH_EARLY      0x00000001      /* Allocating during early boot? */
 123
 124/* Only NUMA needs hash distribution.
 125 * IA64 and x86_64 have sufficient vmalloc space.
 126 */
 127#if defined(CONFIG_NUMA) && (defined(CONFIG_IA64) || defined(CONFIG_X86_64))
 128#define HASHDIST_DEFAULT 1
 129#else
 130#define HASHDIST_DEFAULT 0
 131#endif
 132extern int hashdist;            /* Distribute hashes across NUMA nodes? */
 133
 134
 135#endif /* _LINUX_BOOTMEM_H */
 136