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   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_boot_start;
  32         unsigned long node_low_pfn;
  33         void *node_bootmem_map;
  34         unsigned long last_offset;
  35         unsigned long last_pos;
  36         unsigned long last_success;     /* Previous allocation point.  To speed
  37                                          * up searching */
  38         struct list_head list;
  39 } bootmem_data_t;
  40
  41 extern unsigned long bootmem_bootmap_pages (unsigned long);
  42 extern unsigned long init_bootmem (unsigned long addr, unsigned long memend);
  43 extern void free_bootmem (unsigned long addr, unsigned long size);
  44 extern void * __alloc_bootmem (unsigned long size,
  45                                unsigned long align,
  46                                unsigned long goal);
  47 extern void * __alloc_bootmem_nopanic (unsigned long size,
  48                                        unsigned long align,
  49                                        unsigned long goal);
  50 extern void * __alloc_bootmem_low(unsigned long size,
  51                                   unsigned long align,
  52                                   unsigned long goal);
  53 extern void * __alloc_bootmem_low_node(pg_data_t *pgdat,
  54                                        unsigned long size,
  55                                        unsigned long align,
  56                                        unsigned long goal);
  57 extern void * __alloc_bootmem_core(struct bootmem_data *bdata,
  58                                    unsigned long size,
  59                                    unsigned long align,
  60                                    unsigned long goal,
  61                                    unsigned long limit);
  62 #ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
  63 extern void reserve_bootmem (unsigned long addr, unsigned long size);
  64 #define alloc_bootmem(x) \
  65         __alloc_bootmem(x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
  66 #define alloc_bootmem_low(x) \
  67         __alloc_bootmem_low(x, SMP_CACHE_BYTES, 0)
  68 #define alloc_bootmem_pages(x) \
  69         __alloc_bootmem(x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
  70 #define alloc_bootmem_low_pages(x) \
  71         __alloc_bootmem_low(x, PAGE_SIZE, 0)
  72 #endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
  73 extern unsigned long free_all_bootmem (void);
  74 extern void * __alloc_bootmem_node (pg_data_t *pgdat,
  75                                     unsigned long size,
  76                                     unsigned long align,
  77                                     unsigned long goal);
  78 extern unsigned long init_bootmem_node (pg_data_t *pgdat,
  79                                         unsigned long freepfn,
  80                                         unsigned long startpfn,
  81                                         unsigned long endpfn);
  82 extern void reserve_bootmem_node (pg_data_t *pgdat,
  83                                   unsigned long physaddr,
  84                                   unsigned long size);
  85 extern void free_bootmem_node (pg_data_t *pgdat,
  86                                unsigned long addr,
  87                                unsigned long size);
  88 extern unsigned long free_all_bootmem_node (pg_data_t *pgdat);
  89 #ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
  90 #define alloc_bootmem_node(pgdat, x) \
  91         __alloc_bootmem_node(pgdat, x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
  92 #define alloc_bootmem_pages_node(pgdat, x) \
  93         __alloc_bootmem_node(pgdat, x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
  94 #define alloc_bootmem_low_pages_node(pgdat, x) \
  95         __alloc_bootmem_low_node(pgdat, x, PAGE_SIZE, 0)
  96 #endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
  97
  98 #ifdef CONFIG_HAVE_ARCH_ALLOC_REMAP
  99 extern void *alloc_remap(int nid, unsigned long size);
 100 #else
 101 static inline void *alloc_remap(int nid, unsigned long size)
 102 {
 103         return NULL;
 104 }
 105 #endif
 106
 107 extern unsigned long __meminitdata nr_kernel_pages;
 108 extern unsigned long nr_all_pages;
 109
 110 extern void * alloc_large_system_hash(const char *tablename,
 111                                       unsigned long bucketsize,
 112                                       unsigned long numentries,
 113                                       int scale,
 114                                       int flags,
 115                                       unsigned int *_hash_shift,
 116                                       unsigned int *_hash_mask,
 117                                       unsigned long limit);
 118
 119 #define HASH_HIGHMEM    0x00000001      /* Consider highmem? */
 120 #define HASH_EARLY      0x00000002      /* Allocating during early boot? */
 121
 122 /* Only NUMA needs hash distribution.
 123  * IA64 is known to have sufficient vmalloc space.
 124  */
 125 #if defined(CONFIG_NUMA) && defined(CONFIG_IA64)
 126 #define HASHDIST_DEFAULT 1
 127 #else
 128 #define HASHDIST_DEFAULT 0
 129 #endif
 130 extern int hashdist;            /* Distribute hashes across NUMA nodes? */
 131
 132
 133 #endif /* _LINUX_BOOTMEM_H */