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_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 bootmem_data_t bootmem_node_data[];
  42
  43 extern unsigned long bootmem_bootmap_pages(unsigned long);
  44 extern unsigned long init_bootmem(unsigned long addr, unsigned long memend);
  45 extern void free_bootmem(unsigned long addr, unsigned long size);
  46 extern void *__alloc_bootmem(unsigned long size,
  47                              unsigned long align,
  48                              unsigned long goal);
  49 extern void *__alloc_bootmem_nopanic(unsigned long size,
  50                                      unsigned long align,
  51                                      unsigned long goal);
  52 extern void *__alloc_bootmem_low(unsigned long size,
  53                                  unsigned long align,
  54                                  unsigned long goal);
  55 extern void *__alloc_bootmem_low_node(pg_data_t *pgdat,
  56                                       unsigned long size,
  57                                       unsigned long align,
  58                                       unsigned long goal);
  59
  60 /*
  61  * flags for reserve_bootmem (also if CONFIG_HAVE_ARCH_BOOTMEM_NODE,
  62  * the architecture-specific code should honor this)
  63  */
  64 #define BOOTMEM_DEFAULT         0
  65 #define BOOTMEM_EXCLUSIVE       (1<<0)
  66
  67 #ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
  68 /*
  69  * If flags is 0, then the return value is always 0 (success). If
  70  * flags contains BOOTMEM_EXCLUSIVE, then -EBUSY is returned if the
  71  * memory already was reserved.
  72  */
  73 extern int reserve_bootmem(unsigned long addr, unsigned long size, int flags);
  74 #define alloc_bootmem(x) \
  75         __alloc_bootmem(x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
  76 #define alloc_bootmem_low(x) \
  77         __alloc_bootmem_low(x, SMP_CACHE_BYTES, 0)
  78 #define alloc_bootmem_pages(x) \
  79         __alloc_bootmem(x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
  80 #define alloc_bootmem_low_pages(x) \
  81         __alloc_bootmem_low(x, PAGE_SIZE, 0)
  82 #endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
  83
  84 extern int reserve_bootmem_generic(unsigned long addr, unsigned long size,
  85                                    int flags);
  86 extern unsigned long free_all_bootmem(void);
  87 extern unsigned long free_all_bootmem_node(pg_data_t *pgdat);
  88 extern void *__alloc_bootmem_node(pg_data_t *pgdat,
  89                                   unsigned long size,
  90                                   unsigned long align,
  91                                   unsigned long goal);
  92 extern unsigned long init_bootmem_node(pg_data_t *pgdat,
  93                                        unsigned long freepfn,
  94                                        unsigned long startpfn,
  95                                        unsigned long endpfn);
  96 extern int reserve_bootmem_node(pg_data_t *pgdat,
  97                                  unsigned long physaddr,
  98                                  unsigned long size,
  99                                  int flags);
 100 extern void free_bootmem_node(pg_data_t *pgdat,
 101                               unsigned long addr,
 102                               unsigned long size);
 103 extern void *alloc_bootmem_section(unsigned long size,
 104                                    unsigned long section_nr);
 105
 106 #ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
 107 #define alloc_bootmem_node(pgdat, x) \
 108         __alloc_bootmem_node(pgdat, x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
 109 #define alloc_bootmem_pages_node(pgdat, x) \
 110         __alloc_bootmem_node(pgdat, x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
 111 #define alloc_bootmem_low_pages_node(pgdat, x) \
 112         __alloc_bootmem_low_node(pgdat, x, PAGE_SIZE, 0)
 113 #endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
 114
 115 #ifdef CONFIG_HAVE_ARCH_ALLOC_REMAP
 116 extern void *alloc_remap(int nid, unsigned long size);
 117 #else
 118 static inline void *alloc_remap(int nid, unsigned long size)
 119 {
 120         return NULL;
 121 }
 122 #endif /* CONFIG_HAVE_ARCH_ALLOC_REMAP */
 123
 124 extern unsigned long __meminitdata nr_kernel_pages;
 125 extern unsigned long __meminitdata nr_all_pages;
 126
 127 extern void *alloc_large_system_hash(const char *tablename,
 128                                      unsigned long bucketsize,
 129                                      unsigned long numentries,
 130                                      int scale,
 131                                      int flags,
 132                                      unsigned int *_hash_shift,
 133                                      unsigned int *_hash_mask,
 134                                      unsigned long limit);
 135
 136 #define HASH_EARLY      0x00000001      /* Allocating during early boot? */
 137
 138 /* Only NUMA needs hash distribution.
 139  * IA64 and x86_64 have sufficient vmalloc space.
 140  */
 141 #if defined(CONFIG_NUMA) && (defined(CONFIG_IA64) || defined(CONFIG_X86_64))
 142 #define HASHDIST_DEFAULT 1
 143 #else
 144 #define HASHDIST_DEFAULT 0
 145 #endif
 146 extern int hashdist;            /* Distribute hashes across NUMA nodes? */
 147
 148
 149 #endif /* _LINUX_BOOTMEM_H */