text: /*
   * Discontiguous memory support, Kanoj Sarcar, SGI, Nov 1999
   */
  #ifndef _LINUX_BOOTMEM_H
  #define _LINUX_BOOTMEM_H
  
  #include <linux/mmzone.h>
  #include <asm/dma.h>
  
  /*
   *  simple boot-time physical memory area allocator.
   */
  
  extern unsigned long max_low_pfn;
  extern unsigned long min_low_pfn;
  
  /*
   * highest page
   */
  extern unsigned long max_pfn;
  
  #ifndef CONFIG_NO_BOOTMEM
  /*
   * node_bootmem_map is a map pointer - the bits represent all physical 
   * memory pages (including holes) on the node.
   */
  typedef struct bootmem_data {
  	unsigned long node_min_pfn;
  	unsigned long node_low_pfn;
  	void *node_bootmem_map;
  	unsigned long last_end_off;
  	unsigned long hint_idx;
  	struct list_head list;
  } bootmem_data_t;
  
  extern bootmem_data_t bootmem_node_data[];
  #endif
  
  extern unsigned long bootmem_bootmap_pages(unsigned long);
  
  extern unsigned long init_bootmem_node(pg_data_t *pgdat,
  				       unsigned long freepfn,
  				       unsigned long startpfn,
  				       unsigned long endpfn);
  extern unsigned long init_bootmem(unsigned long addr, unsigned long memend);
  
  extern unsigned long free_low_memory_core_early(int nodeid);
  extern unsigned long free_all_bootmem_node(pg_data_t *pgdat);
  extern unsigned long free_all_bootmem(void);
  
  extern void free_bootmem_node(pg_data_t *pgdat,
  			      unsigned long addr,
  			      unsigned long size);
  extern void free_bootmem(unsigned long addr, unsigned long size);
  extern void free_bootmem_late(unsigned long addr, unsigned long size);
  
  /*
   * Flags for reserve_bootmem (also if CONFIG_HAVE_ARCH_BOOTMEM_NODE,
   * the architecture-specific code should honor this).
   *
   * If flags is 0, then the return value is always 0 (success). If
   * flags contains BOOTMEM_EXCLUSIVE, then -EBUSY is returned if the
   * memory already was reserved.
   */
  #define BOOTMEM_DEFAULT		0
  #define BOOTMEM_EXCLUSIVE	(1<<0)
  
  extern int reserve_bootmem(unsigned long addr,
  			   unsigned long size,
  			   int flags);
  extern int reserve_bootmem_node(pg_data_t *pgdat,
  				unsigned long physaddr,
  				unsigned long size,
  				int flags);
  
  extern void *__alloc_bootmem(unsigned long size,
  			     unsigned long align,
  			     unsigned long goal);
  extern void *__alloc_bootmem_nopanic(unsigned long size,
  				     unsigned long align,
  				     unsigned long goal);
  extern void *__alloc_bootmem_node(pg_data_t *pgdat,
  				  unsigned long size,
  				  unsigned long align,
  				  unsigned long goal);
  void *__alloc_bootmem_node_high(pg_data_t *pgdat,
  				  unsigned long size,
  				  unsigned long align,
  				  unsigned long goal);
  extern void *__alloc_bootmem_node_nopanic(pg_data_t *pgdat,
  				  unsigned long size,
  				  unsigned long align,
  				  unsigned long goal);
  extern void *__alloc_bootmem_low(unsigned long size,
  				 unsigned long align,
  				 unsigned long goal);
  extern void *__alloc_bootmem_low_node(pg_data_t *pgdat,
  				      unsigned long size,
  				      unsigned long align,
  				      unsigned long goal);
  
  #ifdef CONFIG_NO_BOOTMEM
  /* We are using top down, so it is safe to use 0 here */
  #define BOOTMEM_LOW_LIMIT 0
  #else
  #define BOOTMEM_LOW_LIMIT __pa(MAX_DMA_ADDRESS)
  #endif
  
  #define alloc_bootmem(x) \
  	__alloc_bootmem(x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT)
  #define alloc_bootmem_align(x, align) \
  	__alloc_bootmem(x, align, BOOTMEM_LOW_LIMIT)
  #define alloc_bootmem_nopanic(x) \
  	__alloc_bootmem_nopanic(x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT)
  #define alloc_bootmem_pages(x) \
  	__alloc_bootmem(x, PAGE_SIZE, BOOTMEM_LOW_LIMIT)
  #define alloc_bootmem_pages_nopanic(x) \
  	__alloc_bootmem_nopanic(x, PAGE_SIZE, BOOTMEM_LOW_LIMIT)
  #define alloc_bootmem_node(pgdat, x) \
  	__alloc_bootmem_node(pgdat, x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT)
  #define alloc_bootmem_node_nopanic(pgdat, x) \
  	__alloc_bootmem_node_nopanic(pgdat, x, SMP_CACHE_BYTES, BOOTMEM_LOW_LIMIT)
  #define alloc_bootmem_pages_node(pgdat, x) \
  	__alloc_bootmem_node(pgdat, x, PAGE_SIZE, BOOTMEM_LOW_LIMIT)
  #define alloc_bootmem_pages_node_nopanic(pgdat, x) \
  	__alloc_bootmem_node_nopanic(pgdat, x, PAGE_SIZE, BOOTMEM_LOW_LIMIT)
  
  #define alloc_bootmem_low(x) \
  	__alloc_bootmem_low(x, SMP_CACHE_BYTES, 0)
  #define alloc_bootmem_low_pages(x) \
  	__alloc_bootmem_low(x, PAGE_SIZE, 0)
  #define alloc_bootmem_low_pages_node(pgdat, x) \
  	__alloc_bootmem_low_node(pgdat, x, PAGE_SIZE, 0)
  
  extern int reserve_bootmem_generic(unsigned long addr, unsigned long size,
  				   int flags);
  
  extern void *alloc_bootmem_section(unsigned long size,
  				   unsigned long section_nr);
  
  #ifdef CONFIG_HAVE_ARCH_ALLOC_REMAP
  extern void *alloc_remap(int nid, unsigned long size);
  #else
  static inline void *alloc_remap(int nid, unsigned long size)
  {
  	return NULL;
  }
  #endif /* CONFIG_HAVE_ARCH_ALLOC_REMAP */
  
  extern void *alloc_large_system_hash(const char *tablename,
  				     unsigned long bucketsize,
  				     unsigned long numentries,
  				     int scale,
  				     int flags,
  				     unsigned int *_hash_shift,
  				     unsigned int *_hash_mask,
  				     unsigned long limit);
  
  #define HASH_EARLY	0x00000001	/* Allocating during early boot? */
  #define HASH_SMALL	0x00000002	/* sub-page allocation allowed, min
  					 * shift passed via *_hash_shift */
  
  /* Only NUMA needs hash distribution. 64bit NUMA architectures have
   * sufficient vmalloc space.
   */
  #if defined(CONFIG_NUMA) && defined(CONFIG_64BIT)
  #define HASHDIST_DEFAULT 1
  #else
  #define HASHDIST_DEFAULT 0
  #endif
  extern int hashdist;		/* Distribute hashes across NUMA nodes? */
  
  
  #endif /* _LINUX_BOOTMEM_H */
  