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

#ifndef _LINUX_VMALLOC_H
#define _LINUX_VMALLOC_H

#include <linux/spinlock.h>
#include <linux/init.h>
#include <asm/page.h>		/* pgprot_t */

struct vm_area_struct;		/* vma defining user mapping in mm_types.h */

/* bits in flags of vmalloc's vm_struct below */
#define VM_IOREMAP	0x00000001	/* ioremap() and friends */
#define VM_ALLOC	0x00000002	/* vmalloc() */
#define VM_MAP		0x00000004	/* vmap()ed pages */
#define VM_USERMAP	0x00000008	/* suitable for remap_vmalloc_range */
#define VM_VPAGES	0x00000010	/* buffer for pages was vmalloc'ed */
/* bits [20..32] reserved for arch specific ioremap internals */

/*
 * Maximum alignment for ioremap() regions.
 * Can be overriden by arch-specific value.
 */
#ifndef IOREMAP_MAX_ORDER
#define IOREMAP_MAX_ORDER	(7 + PAGE_SHIFT)	/* 128 pages */
#endif

struct vm_struct {
	struct vm_struct	*next;
	void			*addr;
	unsigned long		size;
	unsigned long		flags;
	struct page		**pages;
	unsigned int		nr_pages;
	unsigned long		phys_addr;
	void			*caller;
};

/*
 *	Highlevel APIs for driver use
 */
extern void vm_unmap_ram(const void *mem, unsigned int count);
extern void *vm_map_ram(struct page **pages, unsigned int count,
				int node, pgprot_t prot);
extern void vm_unmap_aliases(void);

#ifdef CONFIG_MMU
extern void __init vmalloc_init(void);
#else
static inline void vmalloc_init(void)
{
}
#endif

extern void *vmalloc(unsigned long size);
extern void *vmalloc_user(unsigned long size);
extern void *vmalloc_node(unsigned long size, int node);
extern void *vmalloc_exec(unsigned long size);
extern void *vmalloc_32(unsigned long size);
extern void *vmalloc_32_user(unsigned long size);
extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
extern void *__vmalloc_area(struct vm_struct *area, gfp_t gfp_mask,
				pgprot_t prot);
extern void vfree(const void *addr);

extern void *vmap(struct page **pages, unsigned int count,
			unsigned long flags, pgprot_t prot);
extern void vunmap(const void *addr);

extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
							unsigned long pgoff);
void vmalloc_sync_all(void);
 
/*
 *	Lowlevel-APIs (not for driver use!)
 */

static inline size_t get_vm_area_size(const struct vm_struct *area)
{
	/* return actual size without guard page */
	return area->size - PAGE_SIZE;
}

extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
extern struct vm_struct *get_vm_area_caller(unsigned long size,
					unsigned long flags, void *caller);
extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
					unsigned long start, unsigned long end);
extern struct vm_struct *__get_vm_area_caller(unsigned long size,
					unsigned long flags,
					unsigned long start, unsigned long end,
					void *caller);
extern struct vm_struct *get_vm_area_node(unsigned long size,
					  unsigned long flags, int node,
					  gfp_t gfp_mask);
extern struct vm_struct *remove_vm_area(const void *addr);

extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
			struct page ***pages);
extern void unmap_kernel_range(unsigned long addr, unsigned long size);

/* Allocate/destroy a 'vmalloc' VM area. */
extern struct vm_struct *alloc_vm_area(size_t size);
extern void free_vm_area(struct vm_struct *area);

/* for /dev/kmem */
extern long vread(char *buf, char *addr, unsigned long count);
extern long vwrite(char *buf, char *addr, unsigned long count);

/*
 *	Internals.  Dont't use..
 */
extern rwlock_t vmlist_lock;
extern struct vm_struct *vmlist;

#endif /* _LINUX_VMALLOC_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _LINUX_VMALLOC_H
	2	#define _LINUX_VMALLOC_H
	3
	4	#include <linux/spinlock.h>
db64fe02	5	#include <linux/init.h>
1da177e4 LT	6	#include <asm/page.h> /* pgprot_t */
1da177e4 LT	7
605d9288	8	struct vm_area_struct; /* vma defining user mapping in mm_types.h */
83342314	9
605d9288	10	/* bits in flags of vmalloc's vm_struct below */
1da177e4 LT	11	#define VM_IOREMAP 0x00000001 /* ioremap() and friends */
	12	#define VM_ALLOC 0x00000002 /* vmalloc() */
	13	#define VM_MAP 0x00000004 /* vmap()ed pages */
83342314	14	#define VM_USERMAP 0x00000008 /* suitable for remap_vmalloc_range */
8757d5fa	15	#define VM_VPAGES 0x00000010 /* buffer for pages was vmalloc'ed */
1da177e4 LT	16	/* bits [20..32] reserved for arch specific ioremap internals */
1da177e4 LT	17
fd195c49 DS	18	/*
	19	* Maximum alignment for ioremap() regions.
	20	* Can be overriden by arch-specific value.
	21	*/
	22	#ifndef IOREMAP_MAX_ORDER
	23	#define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */
	24	#endif
	25
1da177e4	26	struct vm_struct {
2b4ac44e	27	struct vm_struct *next;
1da177e4 LT	28	void *addr;
	29	unsigned long size;
	30	unsigned long flags;
	31	struct page **pages;
	32	unsigned int nr_pages;
	33	unsigned long phys_addr;
23016969	34	void *caller;
1da177e4 LT	35	};
	36
	37	/*
	38	* Highlevel APIs for driver use
	39	*/
db64fe02 NP	40	extern void vm_unmap_ram(const void *mem, unsigned int count);
	41	extern void vm_map_ram(struct page *pages, unsigned int count,
	42	int node, pgprot_t prot);
	43	extern void vm_unmap_aliases(void);
	44
	45	#ifdef CONFIG_MMU
	46	extern void __init vmalloc_init(void);
	47	#else
	48	static inline void vmalloc_init(void)
	49	{
	50	}
	51	#endif
	52
1da177e4	53	extern void *vmalloc(unsigned long size);
83342314	54	extern void *vmalloc_user(unsigned long size);
930fc45a	55	extern void *vmalloc_node(unsigned long size, int node);
1da177e4 LT	56	extern void *vmalloc_exec(unsigned long size);
1da177e4 LT	57	extern void *vmalloc_32(unsigned long size);
83342314	58	extern void *vmalloc_32_user(unsigned long size);
dd0fc66f	59	extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
930fc45a CL	60	extern void __vmalloc_area(struct vm_struct area, gfp_t gfp_mask,
930fc45a CL	61	pgprot_t prot);
b3bdda02	62	extern void vfree(const void *addr);
1da177e4 LT	63
	64	extern void vmap(struct page *pages, unsigned int count,
	65	unsigned long flags, pgprot_t prot);
b3bdda02	66	extern void vunmap(const void *addr);
83342314 NP	67
	68	extern int remap_vmalloc_range(struct vm_area_struct vma, void addr,
	69	unsigned long pgoff);
1eeb66a1	70	void vmalloc_sync_all(void);
1da177e4 LT	71
	72	/*
	73	* Lowlevel-APIs (not for driver use!)
	74	*/
9585116b JF	75
	76	static inline size_t get_vm_area_size(const struct vm_struct *area)
	77	{
	78	/* return actual size without guard page */
	79	return area->size - PAGE_SIZE;
	80	}
	81
1da177e4	82	extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
23016969 CL	83	extern struct vm_struct *get_vm_area_caller(unsigned long size,
23016969 CL	84	unsigned long flags, void *caller);
1da177e4 LT	85	extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
1da177e4 LT	86	unsigned long start, unsigned long end);
c2968612 BH	87	extern struct vm_struct *__get_vm_area_caller(unsigned long size,
	88	unsigned long flags,
	89	unsigned long start, unsigned long end,
	90	void *caller);
930fc45a	91	extern struct vm_struct *get_vm_area_node(unsigned long size,
52fd24ca GP	92	unsigned long flags, int node,
52fd24ca GP	93	gfp_t gfp_mask);
b3bdda02	94	extern struct vm_struct remove_vm_area(const void addr);
c19c03fc	95
1da177e4 LT	96	extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
1da177e4 LT	97	struct page ***pages);
c19c03fc	98	extern void unmap_kernel_range(unsigned long addr, unsigned long size);
1da177e4	99
5f4352fb JF	100	/* Allocate/destroy a 'vmalloc' VM area. */
	101	extern struct vm_struct *alloc_vm_area(size_t size);
	102	extern void free_vm_area(struct vm_struct *area);
	103
69beeb1d KM	104	/* for /dev/kmem */
	105	extern long vread(char buf, char addr, unsigned long count);
	106	extern long vwrite(char buf, char addr, unsigned long count);
	107
1da177e4 LT	108	/*
	109	* Internals. Dont't use..
	110	*/
	111	extern rwlock_t vmlist_lock;
	112	extern struct vm_struct *vmlist;
	113
	114	#endif /* _LINUX_VMALLOC_H */