[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;
	phys_addr_t		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 *vzalloc(unsigned long size);
extern void *vmalloc_user(unsigned long size);
extern void *vmalloc_node(unsigned long size, int node);
extern void *vzalloc_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_node_range(unsigned long size, unsigned long align,
			unsigned long start, unsigned long end, gfp_t gfp_mask,
			pgprot_t prot, int node, void *caller);
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 *remove_vm_area(const void *addr);

extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
			struct page ***pages);
#ifdef CONFIG_MMU
extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
				    pgprot_t prot, struct page **pages);
extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
extern void unmap_kernel_range(unsigned long addr, unsigned long size);
#else
static inline int
map_kernel_range_noflush(unsigned long start, unsigned long size,
			pgprot_t prot, struct page **pages)
{
	return size >> PAGE_SHIFT;
}
static inline void
unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
{
}
static inline void
unmap_kernel_range(unsigned long addr, unsigned long size)
{
}
#endif

/* 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;
extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);

#ifdef CONFIG_SMP
# ifdef CONFIG_MMU
struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
				     const size_t *sizes, int nr_vms,
				     size_t align);

void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
# else
static inline struct vm_struct **
pcpu_get_vm_areas(const unsigned long *offsets,
		const size_t *sizes, int nr_vms,
		size_t align)
{
	return NULL;
}

static inline void
pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
{
}
# endif
#endif

#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;
ffa71f33	33	phys_addr_t 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);
e1ca7788	54	extern void *vzalloc(unsigned long size);
83342314	55	extern void *vmalloc_user(unsigned long size);
930fc45a	56	extern void *vmalloc_node(unsigned long size, int node);
e1ca7788	57	extern void *vzalloc_node(unsigned long size, int node);
1da177e4 LT	58	extern void *vmalloc_exec(unsigned long size);
1da177e4 LT	59	extern void *vmalloc_32(unsigned long size);
83342314	60	extern void *vmalloc_32_user(unsigned long size);
dd0fc66f	61	extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
d0a21265 DR	62	extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
	63	unsigned long start, unsigned long end, gfp_t gfp_mask,
	64	pgprot_t prot, int node, void *caller);
b3bdda02	65	extern void vfree(const void *addr);
1da177e4 LT	66
	67	extern void vmap(struct page *pages, unsigned int count,
	68	unsigned long flags, pgprot_t prot);
b3bdda02	69	extern void vunmap(const void *addr);
83342314 NP	70
	71	extern int remap_vmalloc_range(struct vm_area_struct vma, void addr,
	72	unsigned long pgoff);
1eeb66a1	73	void vmalloc_sync_all(void);
1da177e4 LT	74
	75	/*
	76	* Lowlevel-APIs (not for driver use!)
	77	*/
9585116b JF	78
	79	static inline size_t get_vm_area_size(const struct vm_struct *area)
	80	{
	81	/* return actual size without guard page */
	82	return area->size - PAGE_SIZE;
	83	}
	84
1da177e4	85	extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
23016969 CL	86	extern struct vm_struct *get_vm_area_caller(unsigned long size,
23016969 CL	87	unsigned long flags, void *caller);
1da177e4 LT	88	extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
1da177e4 LT	89	unsigned long start, unsigned long end);
c2968612 BH	90	extern struct vm_struct *__get_vm_area_caller(unsigned long size,
	91	unsigned long flags,
	92	unsigned long start, unsigned long end,
	93	void *caller);
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);
b554cb42	98	#ifdef CONFIG_MMU
8fc48985 TH	99	extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
	100	pgprot_t prot, struct page **pages);
	101	extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
c19c03fc	102	extern void unmap_kernel_range(unsigned long addr, unsigned long size);
b554cb42 GY	103	#else
	104	static inline int
	105	map_kernel_range_noflush(unsigned long start, unsigned long size,
	106	pgprot_t prot, struct page **pages)
	107	{
	108	return size >> PAGE_SHIFT;
	109	}
	110	static inline void
	111	unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
	112	{
	113	}
	114	static inline void
	115	unmap_kernel_range(unsigned long addr, unsigned long size)
	116	{
	117	}
	118	#endif
1da177e4	119
5f4352fb JF	120	/* Allocate/destroy a 'vmalloc' VM area. */
	121	extern struct vm_struct *alloc_vm_area(size_t size);
	122	extern void free_vm_area(struct vm_struct *area);
	123
69beeb1d KM	124	/* for /dev/kmem */
	125	extern long vread(char buf, char addr, unsigned long count);
	126	extern long vwrite(char buf, char addr, unsigned long count);
	127
1da177e4 LT	128	/*
	129	* Internals. Dont't use..
	130	*/
	131	extern rwlock_t vmlist_lock;
	132	extern struct vm_struct *vmlist;
c0c0a293	133	extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
1da177e4	134
4f8b02b4	135	#ifdef CONFIG_SMP
b554cb42	136	# ifdef CONFIG_MMU
ca23e405 TH	137	struct vm_struct *pcpu_get_vm_areas(const unsigned long offsets,
ca23e405 TH	138	const size_t *sizes, int nr_vms,
ec3f64fc	139	size_t align);
ca23e405 TH	140
ca23e405 TH	141	void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
b554cb42 GY	142	# else
	143	static inline struct vm_struct **
	144	pcpu_get_vm_areas(const unsigned long *offsets,
	145	const size_t *sizes, int nr_vms,
	146	size_t align)
	147	{
	148	return NULL;
	149	}
	150
	151	static inline void
	152	pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
	153	{
	154	}
	155	# endif
4f8b02b4	156	#endif
ca23e405	157
1da177e4	158	#endif /* _LINUX_VMALLOC_H */