1 #ifndef _LINUX_VMALLOC_H
2 #define _LINUX_VMALLOC_H
3
4 #include <linux/spinlock.h>
5 #include <asm/page.h> /* pgprot_t */
6
7 struct vm_area_struct;
8
9 /* 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 */
13 #define VM_USERMAP 0x00000008 /* suitable for remap_vmalloc_range */
14 #define VM_VPAGES 0x00000010 /* buffer for pages was vmalloc'ed */
15 /* bits [20..32] reserved for arch specific ioremap internals */
16
17 /*
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
25 struct vm_struct {
26 /* keep next,addr,size together to speedup lookups */
27 struct vm_struct *next;
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;
34 };
35
36 /*
37 * Highlevel APIs for driver use
38 */
39 extern void *vmalloc(unsigned long size);
40 extern void *vmalloc_user(unsigned long size);
41 extern void *vmalloc_node(unsigned long size, int node);
42 extern void *vmalloc_exec(unsigned long size);
43 extern void *vmalloc_32(unsigned long size);
44 extern void *vmalloc_32_user(unsigned long size);
45 extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
46 extern void *__vmalloc_area(struct vm_struct *area, gfp_t gfp_mask,
47 pgprot_t prot);
48 extern void vfree(const void *addr);
49
50 extern void *vmap(struct page **pages, unsigned int count,
51 unsigned long flags, pgprot_t prot);
52 extern void vunmap(const void *addr);
53
54 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
55 unsigned long pgoff);
56 void vmalloc_sync_all(void);
57
58 /*
59 * Lowlevel-APIs (not for driver use!)
60 */
61
62 static 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
68 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
69 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
70 unsigned long start, unsigned long end);
71 extern struct vm_struct *get_vm_area_node(unsigned long size,
72 unsigned long flags, int node,
73 gfp_t gfp_mask);
74 extern struct vm_struct *remove_vm_area(const void *addr);
75
76 extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
77 struct page ***pages);
78 extern void unmap_kernel_range(unsigned long addr, unsigned long size);
79
80 /* Allocate/destroy a 'vmalloc' VM area. */
81 extern struct vm_struct *alloc_vm_area(size_t size);
82 extern void free_vm_area(struct vm_struct *area);
83
84 /*
85 * Internals. Dont't use..
86 */
87 extern rwlock_t vmlist_lock;
88 extern struct vm_struct *vmlist;
89
90 #endif /* _LINUX_VMALLOC_H */
91
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