1. 根目录:
2. include
3. linux
4. bootmem.h

/*
 * 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);

unsigned long free_all_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);

#define alloc_bootmem(x) \
	__alloc_bootmem(x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
#define alloc_bootmem_align(x, align) \
	__alloc_bootmem(x, align, __pa(MAX_DMA_ADDRESS))
#define alloc_bootmem_nopanic(x) \
	__alloc_bootmem_nopanic(x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
#define alloc_bootmem_pages(x) \
	__alloc_bootmem(x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
#define alloc_bootmem_pages_nopanic(x) \
	__alloc_bootmem_nopanic(x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
#define alloc_bootmem_node(pgdat, x) \
	__alloc_bootmem_node(pgdat, x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
#define alloc_bootmem_node_nopanic(pgdat, x) \
	__alloc_bootmem_node_nopanic(pgdat, x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
#define alloc_bootmem_pages_node(pgdat, x) \
	__alloc_bootmem_node(pgdat, x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
#define alloc_bootmem_pages_node_nopanic(pgdat, x) \
	__alloc_bootmem_node_nopanic(pgdat, x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))

#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 */