[linux-2.6-block.git] / include / linux / memblock.h

#ifndef _LINUX_MEMBLOCK_H
#define _LINUX_MEMBLOCK_H
#ifdef __KERNEL__

/*
 * Logical memory blocks.
 *
 * Copyright (C) 2001 Peter Bergner, IBM Corp.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/init.h>
#include <linux/mm.h>

#include <asm/memblock.h>

#define MAX_MEMBLOCK_REGIONS 128

struct memblock_region {
	u64 base;
	u64 size;
};

struct memblock_type {
	unsigned long cnt;
	u64 size;
	struct memblock_region regions[MAX_MEMBLOCK_REGIONS+1];
};

struct memblock {
	unsigned long debug;
	u64 rmo_size;
	u64 current_limit;
	struct memblock_type memory;
	struct memblock_type reserved;
};

extern struct memblock memblock;

extern void __init memblock_init(void);
extern void __init memblock_analyze(void);
extern long memblock_add(u64 base, u64 size);
extern long memblock_remove(u64 base, u64 size);
extern long __init memblock_free(u64 base, u64 size);
extern long __init memblock_reserve(u64 base, u64 size);

extern u64 __init memblock_alloc_nid(u64 size, u64 align, int nid);
extern u64 __init memblock_alloc(u64 size, u64 align);

/* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
#define MEMBLOCK_ALLOC_ANYWHERE	(~(u64)0)
#define MEMBLOCK_ALLOC_ACCESSIBLE	0

extern u64 __init memblock_alloc_base(u64 size,
		u64, u64 max_addr);
extern u64 __init __memblock_alloc_base(u64 size,
		u64 align, u64 max_addr);
extern u64 __init memblock_phys_mem_size(void);
extern u64 memblock_end_of_DRAM(void);
extern void __init memblock_enforce_memory_limit(u64 memory_limit);
extern int memblock_is_memory(u64 addr);
extern int memblock_is_region_memory(u64 base, u64 size);
extern int __init memblock_is_reserved(u64 addr);
extern int memblock_is_region_reserved(u64 base, u64 size);

extern void memblock_dump_all(void);

/* Provided by the architecture */
extern u64 memblock_nid_range(u64 start, u64 end, int *nid);

/**
 * memblock_set_current_limit - Set the current allocation limit to allow
 *                         limiting allocations to what is currently
 *                         accessible during boot
 * @limit: New limit value (physical address)
 */
extern void memblock_set_current_limit(u64 limit);


/*
 * pfn conversion functions
 *
 * While the memory MEMBLOCKs should always be page aligned, the reserved
 * MEMBLOCKs may not be. This accessor attempt to provide a very clear
 * idea of what they return for such non aligned MEMBLOCKs.
 */

/**
 * memblock_region_base_pfn - Return the lowest pfn intersecting with the region
 * @reg: memblock_region structure
 */
static inline unsigned long memblock_region_base_pfn(const struct memblock_region *reg)
{
	return reg->base >> PAGE_SHIFT;
}

/**
 * memblock_region_last_pfn - Return the highest pfn intersecting with the region
 * @reg: memblock_region structure
 */
static inline unsigned long memblock_region_last_pfn(const struct memblock_region *reg)
{
	return (reg->base + reg->size - 1) >> PAGE_SHIFT;
}

/**
 * memblock_region_end_pfn - Return the pfn of the first page following the region
 *                      but not intersecting it
 * @reg: memblock_region structure
 */
static inline unsigned long memblock_region_end_pfn(const struct memblock_region *reg)
{
	return memblock_region_last_pfn(reg) + 1;
}

/**
 * memblock_region_pages - Return the number of pages covering a region
 * @reg: memblock_region structure
 */
static inline unsigned long memblock_region_pages(const struct memblock_region *reg)
{
	return memblock_region_end_pfn(reg) - memblock_region_end_pfn(reg);
}

#define for_each_memblock(memblock_type, region)					\
	for (region = memblock.memblock_type.regions;				\
	     region < (memblock.memblock_type.regions + memblock.memblock_type.cnt);	\
	     region++)


#endif /* __KERNEL__ */

#endif /* _LINUX_MEMBLOCK_H */
Commit	Line	Data
95f72d1e YL	1	#ifndef _LINUX_MEMBLOCK_H
	2	#define _LINUX_MEMBLOCK_H
	3	#ifdef __KERNEL__
	4
	5	/*
	6	* Logical memory blocks.
	7	*
	8	* Copyright (C) 2001 Peter Bergner, IBM Corp.
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License
	12	* as published by the Free Software Foundation; either version
	13	* 2 of the License, or (at your option) any later version.
	14	*/
	15
	16	#include <linux/init.h>
	17	#include <linux/mm.h>
	18
411a25a8 BH	19	#include <asm/memblock.h>
411a25a8 BH	20
95f72d1e YL	21	#define MAX_MEMBLOCK_REGIONS 128
95f72d1e YL	22
e3239ff9	23	struct memblock_region {
95f72d1e YL	24	u64 base;
	25	u64 size;
	26	};
	27
e3239ff9	28	struct memblock_type {
95f72d1e YL	29	unsigned long cnt;
95f72d1e YL	30	u64 size;
e3239ff9	31	struct memblock_region regions[MAX_MEMBLOCK_REGIONS+1];
95f72d1e YL	32	};
	33
	34	struct memblock {
	35	unsigned long debug;
	36	u64 rmo_size;
e63075a3	37	u64 current_limit;
e3239ff9 BH	38	struct memblock_type memory;
e3239ff9 BH	39	struct memblock_type reserved;
95f72d1e YL	40	};
	41
	42	extern struct memblock memblock;
	43
	44	extern void __init memblock_init(void);
	45	extern void __init memblock_analyze(void);
	46	extern long memblock_add(u64 base, u64 size);
	47	extern long memblock_remove(u64 base, u64 size);
	48	extern long __init memblock_free(u64 base, u64 size);
	49	extern long __init memblock_reserve(u64 base, u64 size);
e63075a3	50
35a1f0bd	51	extern u64 __init memblock_alloc_nid(u64 size, u64 align, int nid);
95f72d1e	52	extern u64 __init memblock_alloc(u64 size, u64 align);
e63075a3 BH	53
	54	/* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
	55	#define MEMBLOCK_ALLOC_ANYWHERE (~(u64)0)
	56	#define MEMBLOCK_ALLOC_ACCESSIBLE 0
	57
95f72d1e YL	58	extern u64 __init memblock_alloc_base(u64 size,
	59	u64, u64 max_addr);
	60	extern u64 __init __memblock_alloc_base(u64 size,
	61	u64 align, u64 max_addr);
	62	extern u64 __init memblock_phys_mem_size(void);
	63	extern u64 memblock_end_of_DRAM(void);
	64	extern void __init memblock_enforce_memory_limit(u64 memory_limit);
72d4b0b4 BH	65	extern int memblock_is_memory(u64 addr);
72d4b0b4 BH	66	extern int memblock_is_region_memory(u64 base, u64 size);
95f72d1e YL	67	extern int __init memblock_is_reserved(u64 addr);
95f72d1e YL	68	extern int memblock_is_region_reserved(u64 base, u64 size);
95f72d1e YL	69
	70	extern void memblock_dump_all(void);
	71
35a1f0bd BH	72	/* Provided by the architecture */
	73	extern u64 memblock_nid_range(u64 start, u64 end, int *nid);
	74
e63075a3 BH	75	/**
	76	* memblock_set_current_limit - Set the current allocation limit to allow
	77	* limiting allocations to what is currently
	78	* accessible during boot
	79	* @limit: New limit value (physical address)
	80	*/
	81	extern void memblock_set_current_limit(u64 limit);
	82
35a1f0bd	83
5b385f25 BH	84	/*
	85	* pfn conversion functions
	86	*
	87	* While the memory MEMBLOCKs should always be page aligned, the reserved
	88	* MEMBLOCKs may not be. This accessor attempt to provide a very clear
	89	* idea of what they return for such non aligned MEMBLOCKs.
	90	*/
	91
	92	/**
	93	* memblock_region_base_pfn - Return the lowest pfn intersecting with the region
	94	* @reg: memblock_region structure
	95	*/
	96	static inline unsigned long memblock_region_base_pfn(const struct memblock_region *reg)
	97	{
	98	return reg->base >> PAGE_SHIFT;
	99	}
	100
	101	/**
	102	* memblock_region_last_pfn - Return the highest pfn intersecting with the region
	103	* @reg: memblock_region structure
	104	*/
	105	static inline unsigned long memblock_region_last_pfn(const struct memblock_region *reg)
	106	{
	107	return (reg->base + reg->size - 1) >> PAGE_SHIFT;
	108	}
	109
	110	/**
	111	* memblock_region_end_pfn - Return the pfn of the first page following the region
	112	* but not intersecting it
	113	* @reg: memblock_region structure
	114	*/
	115	static inline unsigned long memblock_region_end_pfn(const struct memblock_region *reg)
	116	{
	117	return memblock_region_last_pfn(reg) + 1;
	118	}
	119
	120	/**
	121	* memblock_region_pages - Return the number of pages covering a region
	122	* @reg: memblock_region structure
	123	*/
	124	static inline unsigned long memblock_region_pages(const struct memblock_region *reg)
	125	{
	126	return memblock_region_end_pfn(reg) - memblock_region_end_pfn(reg);
	127	}
	128
	129	#define for_each_memblock(memblock_type, region) \
	130	for (region = memblock.memblock_type.regions; \
	131	region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \
	132	region++)
	133
	134
95f72d1e YL	135	#endif /* __KERNEL__ */
	136
	137	#endif /* _LINUX_MEMBLOCK_H */