Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
1#ifndef _LINUX_VMALLOC_H
2#define _LINUX_VMALLOC_H
3
4#include <linux/spinlock.h>
5#include <asm/page.h> /* pgprot_t */
6
7struct vm_area_struct; /* vma defining user mapping in mm_types.h */
8
9/* bits in flags of vmalloc's vm_struct below */
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
25struct 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 void *caller;
35};
36
37/*
38 * Highlevel APIs for driver use
39 */
40extern void *vmalloc(unsigned long size);
41extern void *vmalloc_user(unsigned long size);
42extern void *vmalloc_node(unsigned long size, int node);
43extern void *vmalloc_exec(unsigned long size);
44extern void *vmalloc_32(unsigned long size);
45extern void *vmalloc_32_user(unsigned long size);
46extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
47extern void *__vmalloc_area(struct vm_struct *area, gfp_t gfp_mask,
48 pgprot_t prot);
49extern void vfree(const void *addr);
50
51extern void *vmap(struct page **pages, unsigned int count,
52 unsigned long flags, pgprot_t prot);
53extern void vunmap(const void *addr);
54
55extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
56 unsigned long pgoff);
57void vmalloc_sync_all(void);
58
59/*
60 * Lowlevel-APIs (not for driver use!)
61 */
62
63static inline size_t get_vm_area_size(const struct vm_struct *area)
64{
65 /* return actual size without guard page */
66 return area->size - PAGE_SIZE;
67}
68
69extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
70extern struct vm_struct *get_vm_area_caller(unsigned long size,
71 unsigned long flags, void *caller);
72extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
73 unsigned long start, unsigned long end);
74extern struct vm_struct *get_vm_area_node(unsigned long size,
75 unsigned long flags, int node,
76 gfp_t gfp_mask);
77extern struct vm_struct *remove_vm_area(const void *addr);
78
79extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
80 struct page ***pages);
81extern void unmap_kernel_range(unsigned long addr, unsigned long size);
82
83/* Allocate/destroy a 'vmalloc' VM area. */
84extern struct vm_struct *alloc_vm_area(size_t size);
85extern void free_vm_area(struct vm_struct *area);
86
87/*
88 * Internals. Dont't use..
89 */
90extern rwlock_t vmlist_lock;
91extern struct vm_struct *vmlist;
92
93extern const struct seq_operations vmalloc_op;
94
95#endif /* _LINUX_VMALLOC_H */