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 /*
  27  * node_bootmem_map is a map pointer - the bits represent all physical
  28  * memory pages (including holes) on the node.
  29  */
  30 typedef struct bootmem_data {
  31         unsigned long node_min_pfn;
  32         unsigned long node_low_pfn;
  33         void *node_bootmem_map;
  34         unsigned long last_end_off;
  35         unsigned long hint_idx;
  36         struct list_head list;
  37 } bootmem_data_t;
  38
  39 extern bootmem_data_t bootmem_node_data[];
  40
  41 extern unsigned long bootmem_bootmap_pages(unsigned long);
  42
  43 extern unsigned long init_bootmem_node(pg_data_t *pgdat,
  44                                        unsigned long freepfn,
  45                                        unsigned long startpfn,
  46                                        unsigned long endpfn);
  47 extern unsigned long init_bootmem(unsigned long addr, unsigned long memend);
  48
  49 extern unsigned long free_all_bootmem_node(pg_data_t *pgdat);
  50 extern unsigned long free_all_bootmem(void);
  51
  52 extern void free_bootmem_node(pg_data_t *pgdat,
  53                               unsigned long addr,
  54                               unsigned long size);
  55 extern void free_bootmem(unsigned long addr, unsigned long size);
  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 extern void *__alloc_bootmem_node_nopanic(pg_data_t *pgdat,
  87                                   unsigned long size,
  88                                   unsigned long align,
  89                                   unsigned long goal);
  90 extern void *__alloc_bootmem_low(unsigned long size,
  91                                  unsigned long align,
  92                                  unsigned long goal);
  93 extern void *__alloc_bootmem_low_node(pg_data_t *pgdat,
  94                                       unsigned long size,
  95                                       unsigned long align,
  96                                       unsigned long goal);
  97
  98 #define alloc_bootmem(x) \
  99         __alloc_bootmem(x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
 100 #define alloc_bootmem_nopanic(x) \
 101         __alloc_bootmem_nopanic(x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
 102 #define alloc_bootmem_pages(x) \
 103         __alloc_bootmem(x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
 104 #define alloc_bootmem_pages_nopanic(x) \
 105         __alloc_bootmem_nopanic(x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
 106 #define alloc_bootmem_node(pgdat, x) \
 107         __alloc_bootmem_node(pgdat, x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
 108 #define alloc_bootmem_pages_node(pgdat, x) \
 109         __alloc_bootmem_node(pgdat, x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
 110 #define alloc_bootmem_pages_node_nopanic(pgdat, x) \
 111         __alloc_bootmem_node_nopanic(pgdat, x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
 112
 113 #define alloc_bootmem_low(x) \
 114         __alloc_bootmem_low(x, SMP_CACHE_BYTES, 0)
 115 #define alloc_bootmem_low_pages(x) \
 116         __alloc_bootmem_low(x, PAGE_SIZE, 0)
 117 #define alloc_bootmem_low_pages_node(pgdat, x) \
 118         __alloc_bootmem_low_node(pgdat, x, PAGE_SIZE, 0)
 119
 120 extern int reserve_bootmem_generic(unsigned long addr, unsigned long size,
 121                                    int flags);
 122
 123 extern void *alloc_bootmem_section(unsigned long size,
 124                                    unsigned long section_nr);
 125
 126 #ifdef CONFIG_HAVE_ARCH_ALLOC_REMAP
 127 extern void *alloc_remap(int nid, unsigned long size);
 128 #else
 129 static inline void *alloc_remap(int nid, unsigned long size)
 130 {
 131         return NULL;
 132 }
 133 #endif /* CONFIG_HAVE_ARCH_ALLOC_REMAP */
 134
 135 extern void *alloc_large_system_hash(const char *tablename,
 136                                      unsigned long bucketsize,
 137                                      unsigned long numentries,
 138                                      int scale,
 139                                      int flags,
 140                                      unsigned int *_hash_shift,
 141                                      unsigned int *_hash_mask,
 142                                      unsigned long limit);
 143
 144 #define HASH_EARLY      0x00000001      /* Allocating during early boot? */
 145 #define HASH_SMALL      0x00000002      /* sub-page allocation allowed, min
 146                                          * shift passed via *_hash_shift */
 147
 148 /* Only NUMA needs hash distribution. 64bit NUMA architectures have
 149  * sufficient vmalloc space.
 150  */
 151 #if defined(CONFIG_NUMA) && defined(CONFIG_64BIT)
 152 #define HASHDIST_DEFAULT 1
 153 #else
 154 #define HASHDIST_DEFAULT 0
 155 #endif
 156 extern int hashdist;            /* Distribute hashes across NUMA nodes? */
 157
 158
 159 #endif /* _LINUX_BOOTMEM_H */