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;
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
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};
35
36/*
37 * Highlevel APIs for driver use
38 */
39extern void *vmalloc(unsigned long size);
40extern void *vmalloc_user(unsigned long size);
41extern void *vmalloc_node(unsigned long size, int node);
42extern void *vmalloc_exec(unsigned long size);
43extern void *vmalloc_32(unsigned long size);
44extern void *vmalloc_32_user(unsigned long size);
45extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
46extern void *__vmalloc_area(struct vm_struct *area, gfp_t gfp_mask,
47 pgprot_t prot);
48extern void vfree(const void *addr);
49
50extern void *vmap(struct page **pages, unsigned int count,
51 unsigned long flags, pgprot_t prot);
52extern void vunmap(const void *addr);
53
54extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
55 unsigned long pgoff);
56void vmalloc_sync_all(void);
57
58/*
59 * Lowlevel-APIs (not for driver use!)
60 */
61
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
68extern 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);
71extern struct vm_struct *get_vm_area_node(unsigned long size,
72 unsigned long flags, int node,
73 gfp_t gfp_mask);
74extern struct vm_struct *remove_vm_area(const void *addr);
75
76extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
77 struct page ***pages);
78extern void unmap_kernel_range(unsigned long addr, unsigned long size);
79
80/* 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
84/*
85 * Internals. Dont't use..
86 */
87extern rwlock_t vmlist_lock;
88extern struct vm_struct *vmlist;
89
90#endif /* _LINUX_VMALLOC_H */