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