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
  14 extern unsigned long max_low_pfn;
  15 extern unsigned long min_low_pfn;
  16
  17 /*
  18  * highest page
  19  */
  20 extern unsigned long max_pfn;
  21
  22 #ifdef CONFIG_CRASH_DUMP
  23 extern 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  */
  31 typedef 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
  40 extern bootmem_data_t bootmem_node_data[];
  41 #endif
  42
  43 extern unsigned long bootmem_bootmap_pages(unsigned long);
  44
  45 extern unsigned long init_bootmem_node(pg_data_t *pgdat,
  46                                        unsigned long freepfn,
  47                                        unsigned long startpfn,
  48                                        unsigned long endpfn);
  49 extern unsigned long init_bootmem(unsigned long addr, unsigned long memend);
  50
  51 unsigned long free_all_memory_core_early(int nodeid);
  52 extern unsigned long free_all_bootmem_node(pg_data_t *pgdat);
  53 extern unsigned long free_all_bootmem(void);
  54
  55 extern void free_bootmem_node(pg_data_t *pgdat,
  56                               unsigned long addr,
  57                               unsigned long size);
  58 extern void free_bootmem(unsigned long addr, unsigned long size);
  59 extern 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
  72 extern int reserve_bootmem(unsigned long addr,
  73                            unsigned long size,
  74                            int flags);
  75 extern int reserve_bootmem_node(pg_data_t *pgdat,
  76                                 unsigned long physaddr,
  77                                 unsigned long size,
  78                                 int flags);
  79
  80 extern void *__alloc_bootmem(unsigned long size,
  81                              unsigned long align,
  82                              unsigned long goal);
  83 extern void *__alloc_bootmem_nopanic(unsigned long size,
  84                                      unsigned long align,
  85                                      unsigned long goal);
  86 extern void *__alloc_bootmem_node(pg_data_t *pgdat,
  87                                   unsigned long size,
  88                                   unsigned long align,
  89                                   unsigned long goal);
  90 void *__alloc_bootmem_node_high(pg_data_t *pgdat,
  91                                   unsigned long size,
  92                                   unsigned long align,
  93                                   unsigned long goal);
  94 extern void *__alloc_bootmem_node_nopanic(pg_data_t *pgdat,
  95                                   unsigned long size,
  96                                   unsigned long align,
  97                                   unsigned long goal);
  98 extern void *__alloc_bootmem_low(unsigned long size,
  99                                  unsigned long align,
 100                                  unsigned long goal);
 101 extern 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_nopanic(x) \
 109         __alloc_bootmem_nopanic(x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
 110 #define alloc_bootmem_pages(x) \
 111         __alloc_bootmem(x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
 112 #define alloc_bootmem_pages_nopanic(x) \
 113         __alloc_bootmem_nopanic(x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
 114 #define alloc_bootmem_node(pgdat, x) \
 115         __alloc_bootmem_node(pgdat, x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
 116 #define alloc_bootmem_pages_node(pgdat, x) \
 117         __alloc_bootmem_node(pgdat, x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
 118 #define alloc_bootmem_pages_node_nopanic(pgdat, x) \
 119         __alloc_bootmem_node_nopanic(pgdat, x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
 120
 121 #define alloc_bootmem_low(x) \
 122         __alloc_bootmem_low(x, SMP_CACHE_BYTES, 0)
 123 #define alloc_bootmem_low_pages(x) \
 124         __alloc_bootmem_low(x, PAGE_SIZE, 0)
 125 #define alloc_bootmem_low_pages_node(pgdat, x) \
 126         __alloc_bootmem_low_node(pgdat, x, PAGE_SIZE, 0)
 127
 128 extern int reserve_bootmem_generic(unsigned long addr, unsigned long size,
 129                                    int flags);
 130
 131 extern void *alloc_bootmem_section(unsigned long size,
 132                                    unsigned long section_nr);
 133
 134 #ifdef CONFIG_HAVE_ARCH_ALLOC_REMAP
 135 extern void *alloc_remap(int nid, unsigned long size);
 136 #else
 137 static inline void *alloc_remap(int nid, unsigned long size)
 138 {
 139         return NULL;
 140 }
 141 #endif /* CONFIG_HAVE_ARCH_ALLOC_REMAP */
 142
 143 extern void *alloc_large_system_hash(const char *tablename,
 144                                      unsigned long bucketsize,
 145                                      unsigned long numentries,
 146                                      int scale,
 147                                      int flags,
 148                                      unsigned int *_hash_shift,
 149                                      unsigned int *_hash_mask,
 150                                      unsigned long limit);
 151
 152 #define HASH_EARLY      0x00000001      /* Allocating during early boot? */
 153 #define HASH_SMALL      0x00000002      /* sub-page allocation allowed, min
 154                                          * shift passed via *_hash_shift */
 155
 156 /* Only NUMA needs hash distribution. 64bit NUMA architectures have
 157  * sufficient vmalloc space.
 158  */
 159 #if defined(CONFIG_NUMA) && defined(CONFIG_64BIT)
 160 #define HASHDIST_DEFAULT 1
 161 #else
 162 #define HASHDIST_DEFAULT 0
 163 #endif
 164 extern int hashdist;            /* Distribute hashes across NUMA nodes? */
 165
 166
 167 #endif /* _LINUX_BOOTMEM_H */