LXR linux/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
  14extern unsigned long max_low_pfn;
  15extern unsigned long min_low_pfn;
  16
  17/*
  18 * highest page
  19 */
  20extern unsigned long max_pfn;
  21
  22#ifdef CONFIG_CRASH_DUMP
  23extern 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 */
  30typedef 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
  39extern bootmem_data_t bootmem_node_data[];
  40
  41extern unsigned long bootmem_bootmap_pages(unsigned long);
  42
  43extern unsigned long init_bootmem_node(pg_data_t *pgdat,
  44                                       unsigned long freepfn,
  45                                       unsigned long startpfn,
  46                                       unsigned long endpfn);
  47extern unsigned long init_bootmem(unsigned long addr, unsigned long memend);
  48
  49extern unsigned long free_all_bootmem_node(pg_data_t *pgdat);
  50extern unsigned long free_all_bootmem(void);
  51
  52extern void free_bootmem_node(pg_data_t *pgdat,
  53                              unsigned long addr,
  54                              unsigned long size);
  55extern void free_bootmem(unsigned long addr, unsigned long size);
  56extern void free_bootmem_late(unsigned long addr, unsigned long size);
  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
  69extern int reserve_bootmem(unsigned long addr,
  70                           unsigned long size,
  71                           int flags);
  72extern int reserve_bootmem_node(pg_data_t *pgdat,
  73                                unsigned long physaddr,
  74                                unsigned long size,
  75                                int flags);
  76
  77extern void *__alloc_bootmem(unsigned long size,
  78                             unsigned long align,
  79                             unsigned long goal);
  80extern void *__alloc_bootmem_nopanic(unsigned long size,
  81                                     unsigned long align,
  82                                     unsigned long goal);
  83extern void *__alloc_bootmem_node(pg_data_t *pgdat,
  84                                  unsigned long size,
  85                                  unsigned long align,
  86                                  unsigned long goal);
  87extern void *__alloc_bootmem_node_nopanic(pg_data_t *pgdat,
  88                                  unsigned long size,
  89                                  unsigned long align,
  90                                  unsigned long goal);
  91extern void *__alloc_bootmem_low(unsigned long size,
  92                                 unsigned long align,
  93                                 unsigned long goal);
  94extern void *__alloc_bootmem_low_node(pg_data_t *pgdat,
  95                                      unsigned long size,
  96                                      unsigned long align,
  97                                      unsigned long goal);
  98
  99#define alloc_bootmem(x) \
 100        __alloc_bootmem(x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
 101#define alloc_bootmem_nopanic(x) \
 102        __alloc_bootmem_nopanic(x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
 103#define alloc_bootmem_pages(x) \
 104        __alloc_bootmem(x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
 105#define alloc_bootmem_pages_nopanic(x) \
 106        __alloc_bootmem_nopanic(x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
 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_pages_node_nopanic(pgdat, x) \
 112        __alloc_bootmem_node_nopanic(pgdat, x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
 113
 114#define alloc_bootmem_low(x) \
 115        __alloc_bootmem_low(x, SMP_CACHE_BYTES, 0)
 116#define alloc_bootmem_low_pages(x) \
 117        __alloc_bootmem_low(x, PAGE_SIZE, 0)
 118#define alloc_bootmem_low_pages_node(pgdat, x) \
 119        __alloc_bootmem_low_node(pgdat, x, PAGE_SIZE, 0)
 120
 121extern int reserve_bootmem_generic(unsigned long addr, unsigned long size,
 122                                   int flags);
 123
 124extern void *alloc_bootmem_section(unsigned long size,
 125                                   unsigned long section_nr);
 126
 127#ifdef CONFIG_HAVE_ARCH_ALLOC_REMAP
 128extern void *alloc_remap(int nid, unsigned long size);
 129#else
 130static inline void *alloc_remap(int nid, unsigned long size)
 131{
 132        return NULL;
 133}
 134#endif /* CONFIG_HAVE_ARCH_ALLOC_REMAP */
 135
 136extern void *alloc_large_system_hash(const char *tablename,
 137                                     unsigned long bucketsize,
 138                                     unsigned long numentries,
 139                                     int scale,
 140                                     int flags,
 141                                     unsigned int *_hash_shift,
 142                                     unsigned int *_hash_mask,
 143                                     unsigned long limit);
 144
 145#define HASH_EARLY      0x00000001      /* Allocating during early boot? */
 146#define HASH_SMALL      0x00000002      /* sub-page allocation allowed, min
 147                                         * shift passed via *_hash_shift */
 148
 149/* Only NUMA needs hash distribution. 64bit NUMA architectures have
 150 * sufficient vmalloc space.
 151 */
 152#if defined(CONFIG_NUMA) && defined(CONFIG_64BIT)
 153#define HASHDIST_DEFAULT 1
 154#else
 155#define HASHDIST_DEFAULT 0
 156#endif
 157extern int hashdist;            /* Distribute hashes across NUMA nodes? */
 158
 159
 160#endif /* _LINUX_BOOTMEM_H */
 161