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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _LINUX_VMALLOC_H
2#define _LINUX_VMALLOC_H
3
4#include <linux/spinlock.h>
5#include <asm/page.h> /* pgprot_t */
6
Nick Piggin83342312006-06-23 02:03:20 -07007struct vm_area_struct;
8
Linus Torvalds1da177e2005-04-16 15:20:36 -07009/* bits in vm_struct->flags */
10#define VM_IOREMAP 0x00000001 /* ioremap() and friends */
11#define VM_ALLOC 0x00000002 /* vmalloc() */
12#define VM_MAP 0x00000004 /* vmap()ed pages */
Nick Piggin83342312006-06-23 02:03:20 -070013#define VM_USERMAP 0x00000008 /* suitable for remap_vmalloc_range */
Jan Kiszka8757d5f2006-07-14 00:23:56 -070014#define VM_VPAGES 0x00000010 /* buffer for pages was vmalloc'ed */
Linus Torvalds1da177e2005-04-16 15:20:36 -070015/* bits [20..32] reserved for arch specific ioremap internals */
16
Deepak Saxenafd195c42005-09-03 15:54:58 -070017/*
18 * Maximum alignment for ioremap() regions.
19 * Can be overriden by arch-specific value.
20 */
21#ifndef IOREMAP_MAX_ORDER
22#define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */
23#endif
24
Linus Torvalds1da177e2005-04-16 15:20:36 -070025struct vm_struct {
Eric Dumazet2b4ac442006-11-10 12:27:48 -080026 /* keep next,addr,size together to speedup lookups */
27 struct vm_struct *next;
Linus Torvalds1da177e2005-04-16 15:20:36 -070028 void *addr;
29 unsigned long size;
30 unsigned long flags;
31 struct page **pages;
32 unsigned int nr_pages;
33 unsigned long phys_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070034};
35
36/*
37 * Highlevel APIs for driver use
38 */
39extern void *vmalloc(unsigned long size);
Nick Piggin83342312006-06-23 02:03:20 -070040extern void *vmalloc_user(unsigned long size);
Christoph Lameter930fc452005-10-29 18:15:41 -070041extern void *vmalloc_node(unsigned long size, int node);
Linus Torvalds1da177e2005-04-16 15:20:36 -070042extern void *vmalloc_exec(unsigned long size);
43extern void *vmalloc_32(unsigned long size);
Nick Piggin83342312006-06-23 02:03:20 -070044extern void *vmalloc_32_user(unsigned long size);
Al Virodd0fc662005-10-07 07:46:04 +010045extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
Christoph Lameter930fc452005-10-29 18:15:41 -070046extern void *__vmalloc_area(struct vm_struct *area, gfp_t gfp_mask,
47 pgprot_t prot);
Linus Torvalds1da177e2005-04-16 15:20:36 -070048extern void vfree(void *addr);
49
50extern void *vmap(struct page **pages, unsigned int count,
51 unsigned long flags, pgprot_t prot);
52extern void vunmap(void *addr);
Nick Piggin83342312006-06-23 02:03:20 -070053
54extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
55 unsigned long pgoff);
Christoph Hellwig1eeb66a2007-05-08 00:27:03 -070056void vmalloc_sync_all(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
58/*
59 * Lowlevel-APIs (not for driver use!)
60 */
Jeremy Fitzhardinge95851162007-07-21 17:11:35 +020061
62static inline size_t get_vm_area_size(const struct vm_struct *area)
63{
64 /* return actual size without guard page */
65 return area->size - PAGE_SIZE;
66}
67
Linus Torvalds1da177e2005-04-16 15:20:36 -070068extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
69extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
70 unsigned long start, unsigned long end);
Christoph Lameter930fc452005-10-29 18:15:41 -070071extern struct vm_struct *get_vm_area_node(unsigned long size,
Giridhar Pemmasani52fd24c2006-10-28 10:38:34 -070072 unsigned long flags, int node,
73 gfp_t gfp_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074extern struct vm_struct *remove_vm_area(void *addr);
Benjamin Herrenschmidtc19c03f2007-06-04 15:15:35 +100075
Linus Torvalds1da177e2005-04-16 15:20:36 -070076extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
77 struct page ***pages);
Benjamin Herrenschmidtc19c03f2007-06-04 15:15:35 +100078extern void unmap_kernel_range(unsigned long addr, unsigned long size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
Jeremy Fitzhardinge5f4352f2007-07-17 18:37:04 -070080/* Allocate/destroy a 'vmalloc' VM area. */
81extern struct vm_struct *alloc_vm_area(size_t size);
82extern void free_vm_area(struct vm_struct *area);
83
Linus Torvalds1da177e2005-04-16 15:20:36 -070084/*
85 * Internals. Dont't use..
86 */
87extern rwlock_t vmlist_lock;
88extern struct vm_struct *vmlist;
89
90#endif /* _LINUX_VMALLOC_H */