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 #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  */
  27 typedef 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
  36 extern bootmem_data_t bootmem_node_data[];
  37 #endif
  38
  39 extern unsigned long bootmem_bootmap_pages(unsigned long);
  40
  41 extern unsigned long init_bootmem_node(pg_data_t *pgdat,
  42                                        unsigned long freepfn,
  43                                        unsigned long startpfn,
  44                                        unsigned long endpfn);
  45 extern unsigned long init_bootmem(unsigned long addr, unsigned long memend);
  46
  47 extern unsigned long free_low_memory_core_early(int nodeid);
  48 extern unsigned long free_all_bootmem_node(pg_data_t *pgdat);
  49 extern unsigned long free_all_bootmem(void);
  50
  51 extern void free_bootmem_node(pg_data_t *pgdat,
  52                               unsigned long addr,
  53                               unsigned long size);
  54 extern void free_bootmem(unsigned long physaddr, unsigned long size);
  55 extern void free_bootmem_late(unsigned long physaddr, unsigned long size);
  56 extern void __free_pages_bootmem(struct page *page, unsigned int order);
  57
  58 /*
  59  * Flags for reserve_bootmem (also if CONFIG_HAVE_ARCH_BOOTMEM_NODE,
  60  * the architecture-specific code should honor this).
  61  *
  62  * If flags is 0, then the return value is always 0 (success). If
  63  * flags contains BOOTMEM_EXCLUSIVE, then -EBUSY is returned if the
  64  * memory already was reserved.
  65  */
  66 #define BOOTMEM_DEFAULT         0
  67 #define BOOTMEM_EXCLUSIVE       (1<<0)
  68
  69 extern int reserve_bootmem(unsigned long addr,
  70                            unsigned long size,
  71                            int flags);
  72 extern int reserve_bootmem_node(pg_data_t *pgdat,
  73                                 unsigned long physaddr,
  74                                 unsigned long size,
  75                                 int flags);
  76
  77 extern void *__alloc_bootmem(unsigned long size,
  78                              unsigned long align,
  79                              unsigned long goal);
  80 extern void *__alloc_bootmem_nopanic(unsigned long size,
  81                                      unsigned long align,
  82                                      unsigned long goal);
  83 extern void *__alloc_bootmem_node(pg_data_t *pgdat,
  84                                   unsigned long size,
  85                                   unsigned long align,
  86                                   unsigned long goal);
  87 void *__alloc_bootmem_node_high(pg_data_t *pgdat,
  88                                   unsigned long size,
  89                                   unsigned long align,
  90                                   unsigned long goal);
  91 extern void *__alloc_bootmem_node_nopanic(pg_data_t *pgdat,
  92                                   unsigned long size,
  93                                   unsigned long align,
  94                                   unsigned long goal);
  95 void *___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
  96                                   unsigned long size,
  97                                   unsigned long align,
  98                                   unsigned long goal,
  99                                   unsigned long limit);
 100 extern void *__alloc_bootmem_low(unsigned long size,
 101                                  unsigned long align,
 102                                  unsigned long goal);
 103 void *__alloc_bootmem_low_nopanic(unsigned long size,
 104                                  unsigned long align,
 105                                  unsigned long goal);
 106 extern void *__alloc_bootmem_low_node(pg_data_t *pgdat,
 107                                       unsigned long size,
 108                                       unsigned long align,
 109                                       unsigned long goal);
 110
 111 #ifdef CONFIG_NO_BOOTMEM
 112 /* We are using top down, so it is safe to use 0 here */
 113 #define BOOTMEM_LOW_LIMIT 0
 114 #else
 115 #define BOOTMEM_LOW_LIMIT __pa(MAX_DMA_ADDRESS)
 116 #endif
 117
 118 #define alloc_bootmem(x) \
 119         __alloc_bootmem(x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT)
 120 #define alloc_bootmem_align(x, align) \
 121         __alloc_bootmem(x, align, BOOTMEM_LOW_LIMIT)
 122 #define alloc_bootmem_nopanic(x) \
 123         __alloc_bootmem_nopanic(x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT)
 124 #define alloc_bootmem_pages(x) \
 125         __alloc_bootmem(x, PAGE_SIZE, BOOTMEM_LOW_LIMIT)
 126 #define alloc_bootmem_pages_nopanic(x) \
 127         __alloc_bootmem_nopanic(x, PAGE_SIZE, BOOTMEM_LOW_LIMIT)
 128 #define alloc_bootmem_node(pgdat, x) \
 129         __alloc_bootmem_node(pgdat, x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT)
 130 #define alloc_bootmem_node_nopanic(pgdat, x) \
 131         __alloc_bootmem_node_nopanic(pgdat, x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT)
 132 #define alloc_bootmem_pages_node(pgdat, x) \
 133         __alloc_bootmem_node(pgdat, x, PAGE_SIZE, BOOTMEM_LOW_LIMIT)
 134 #define alloc_bootmem_pages_node_nopanic(pgdat, x) \
 135         __alloc_bootmem_node_nopanic(pgdat, x, PAGE_SIZE, BOOTMEM_LOW_LIMIT)
 136
 137 #define alloc_bootmem_low(x) \
 138         __alloc_bootmem_low(x, SMP_CACHE_BYTES, 0)
 139 #define alloc_bootmem_low_pages_nopanic(x) \
 140         __alloc_bootmem_low_nopanic(x, PAGE_SIZE, 0)
 141 #define alloc_bootmem_low_pages(x) \
 142         __alloc_bootmem_low(x, PAGE_SIZE, 0)
 143 #define alloc_bootmem_low_pages_node(pgdat, x) \
 144         __alloc_bootmem_low_node(pgdat, x, PAGE_SIZE, 0)
 145
 146 #ifdef CONFIG_HAVE_ARCH_ALLOC_REMAP
 147 extern void *alloc_remap(int nid, unsigned long size);
 148 #else
 149 static inline void *alloc_remap(int nid, unsigned long size)
 150 {
 151         return NULL;
 152 }
 153 #endif /* CONFIG_HAVE_ARCH_ALLOC_REMAP */
 154
 155 extern void *alloc_large_system_hash(const char *tablename,
 156                                      unsigned long bucketsize,
 157                                      unsigned long numentries,
 158                                      int scale,
 159                                      int flags,
 160                                      unsigned int *_hash_shift,
 161                                      unsigned int *_hash_mask,
 162                                      unsigned long low_limit,
 163                                      unsigned long high_limit);
 164
 165 #define HASH_EARLY      0x00000001      /* Allocating during early boot? */
 166 #define HASH_SMALL      0x00000002      /* sub-page allocation allowed, min
 167                                          * shift passed via *_hash_shift */
 168
 169 /* Only NUMA needs hash distribution. 64bit NUMA architectures have
 170  * sufficient vmalloc space.
 171  */
 172 #if defined(CONFIG_NUMA) && defined(CONFIG_64BIT)
 173 #define HASHDIST_DEFAULT 1
 174 #else
 175 #define HASHDIST_DEFAULT 0
 176 #endif
 177 extern int hashdist;            /* Distribute hashes across NUMA nodes? */
 178
 179
 180 #endif /* _LINUX_BOOTMEM_H */