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