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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>
Nick Piggindb64fe02008-10-18 20:27:03 -07005#include <linux/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07006#include <asm/page.h> /* pgprot_t */
7
Hugh Dickins605d9282008-08-16 11:07:21 +01008struct vm_area_struct; /* vma defining user mapping in mm_types.h */
Nick Piggin83342312006-06-23 02:03:20 -07009
Hugh Dickins605d9282008-08-16 11:07:21 +010010/* bits in flags of vmalloc's vm_struct below */
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#define VM_IOREMAP 0x00000001 /* ioremap() and friends */
12#define VM_ALLOC 0x00000002 /* vmalloc() */
13#define VM_MAP 0x00000004 /* vmap()ed pages */
Nick Piggin83342312006-06-23 02:03:20 -070014#define VM_USERMAP 0x00000008 /* suitable for remap_vmalloc_range */
Jan Kiszka8757d5f2006-07-14 00:23:56 -070015#define VM_VPAGES 0x00000010 /* buffer for pages was vmalloc'ed */
Linus Torvalds1da177e2005-04-16 15:20:36 -070016/* bits [20..32] reserved for arch specific ioremap internals */
17
Deepak Saxenafd195c42005-09-03 15:54:58 -070018/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070026struct vm_struct {
Eric Dumazet2b4ac442006-11-10 12:27:48 -080027 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;
Christoph Lameter23016962008-04-28 02:12:42 -070034 void *caller;
Linus Torvalds1da177e2005-04-16 15:20:36 -070035};
36
37/*
38 * Highlevel APIs for driver use
39 */
Nick Piggindb64fe02008-10-18 20:27:03 -070040extern void vm_unmap_ram(const void *mem, unsigned int count);
41extern void *vm_map_ram(struct page **pages, unsigned int count,
42 int node, pgprot_t prot);
43extern void vm_unmap_aliases(void);
44
45#ifdef CONFIG_MMU
46extern void __init vmalloc_init(void);
47#else
48static inline void vmalloc_init(void)
49{
50}
51#endif
52
Linus Torvalds1da177e2005-04-16 15:20:36 -070053extern void *vmalloc(unsigned long size);
Nick Piggin83342312006-06-23 02:03:20 -070054extern void *vmalloc_user(unsigned long size);
Christoph Lameter930fc452005-10-29 18:15:41 -070055extern void *vmalloc_node(unsigned long size, int node);
Linus Torvalds1da177e2005-04-16 15:20:36 -070056extern void *vmalloc_exec(unsigned long size);
57extern void *vmalloc_32(unsigned long size);
Nick Piggin83342312006-06-23 02:03:20 -070058extern void *vmalloc_32_user(unsigned long size);
Al Virodd0fc662005-10-07 07:46:04 +010059extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
Christoph Lameter930fc452005-10-29 18:15:41 -070060extern void *__vmalloc_area(struct vm_struct *area, gfp_t gfp_mask,
61 pgprot_t prot);
Christoph Lameterb3bdda02008-02-04 22:28:32 -080062extern void vfree(const void *addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
64extern void *vmap(struct page **pages, unsigned int count,
65 unsigned long flags, pgprot_t prot);
Christoph Lameterb3bdda02008-02-04 22:28:32 -080066extern void vunmap(const void *addr);
Nick Piggin83342312006-06-23 02:03:20 -070067
68extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
69 unsigned long pgoff);
Christoph Hellwig1eeb66a2007-05-08 00:27:03 -070070void vmalloc_sync_all(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
72/*
73 * Lowlevel-APIs (not for driver use!)
74 */
Jeremy Fitzhardinge95851162007-07-21 17:11:35 +020075
76static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070082extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
Christoph Lameter23016962008-04-28 02:12:42 -070083extern struct vm_struct *get_vm_area_caller(unsigned long size,
84 unsigned long flags, void *caller);
Linus Torvalds1da177e2005-04-16 15:20:36 -070085extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
86 unsigned long start, unsigned long end);
Christoph Lameter930fc452005-10-29 18:15:41 -070087extern struct vm_struct *get_vm_area_node(unsigned long size,
Giridhar Pemmasani52fd24c2006-10-28 10:38:34 -070088 unsigned long flags, int node,
89 gfp_t gfp_mask);
Christoph Lameterb3bdda02008-02-04 22:28:32 -080090extern struct vm_struct *remove_vm_area(const void *addr);
Benjamin Herrenschmidtc19c03f2007-06-04 15:15:35 +100091
Linus Torvalds1da177e2005-04-16 15:20:36 -070092extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
93 struct page ***pages);
Benjamin Herrenschmidtc19c03f2007-06-04 15:15:35 +100094extern void unmap_kernel_range(unsigned long addr, unsigned long size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
Jeremy Fitzhardinge5f4352f2007-07-17 18:37:04 -070096/* Allocate/destroy a 'vmalloc' VM area. */
97extern struct vm_struct *alloc_vm_area(size_t size);
98extern void free_vm_area(struct vm_struct *area);
99
KOSAKI Motohiro69beeb12009-01-06 14:39:46 -0800100/* for /dev/kmem */
101extern long vread(char *buf, char *addr, unsigned long count);
102extern long vwrite(char *buf, char *addr, unsigned long count);
103
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104/*
105 * Internals. Dont't use..
106 */
107extern rwlock_t vmlist_lock;
108extern struct vm_struct *vmlist;
109
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110#endif /* _LINUX_VMALLOC_H */