1 #ifndef _LINUX_VMALLOC_H
2 #define _LINUX_VMALLOC_H
3
4 #include <linux/spinlock.h>
5 #include <linux/init.h>
6 #include <asm/page.h> /* pgprot_t */
7
8 struct vm_area_struct; /* vma defining user mapping in mm_types.h */
9
10 /* bits in flags of vmalloc's vm_struct below */
11 #define VM_IOREMAP 0x00000001 /* ioremap() and friends */
12 #define VM_ALLOC 0x00000002 /* vmalloc() */
13 #define VM_MAP 0x00000004 /* vmap()ed pages */
14 #define VM_USERMAP 0x00000008 /* suitable for remap_vmalloc_range */
15 #define VM_VPAGES 0x00000010 /* buffer for pages was vmalloc'ed */
16 /* bits [20..32] reserved for arch specific ioremap internals */
17
18 /*
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
26 struct vm_struct {
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 */
40 extern void vm_unmap_ram(const void *mem, unsigned int count);
41 extern void *vm_map_ram(struct page **pages, unsigned int count,
42 int node, pgprot_t prot);
43 extern void vm_unmap_aliases(void);
44
45 #ifdef CONFIG_MMU
46 extern void __init vmalloc_init(void);
47 #else
vmalloc_init(void)48 static inline void vmalloc_init(void)
49 {
50 }
51 #endif
52
53 extern void *vmalloc(unsigned long size);
54 extern void *vmalloc_user(unsigned long size);
55 extern void *vmalloc_node(unsigned long size, int node);
56 extern void *vmalloc_exec(unsigned long size);
57 extern void *vmalloc_32(unsigned long size);
58 extern void *vmalloc_32_user(unsigned long size);
59 extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
60 extern void *__vmalloc_area(struct vm_struct *area, gfp_t gfp_mask,
61 pgprot_t prot);
62 extern void vfree(const void *addr);
63
64 extern void *vmap(struct page **pages, unsigned int count,
65 unsigned long flags, pgprot_t prot);
66 extern void vunmap(const void *addr);
67
68 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
69 unsigned long pgoff);
70 void vmalloc_sync_all(void);
71
72 /*
73 * Lowlevel-APIs (not for driver use!)
74 */
75
get_vm_area_size(const struct vm_struct * area)76 static 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
82 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
83 extern struct vm_struct *get_vm_area_caller(unsigned long size,
84 unsigned long flags, void *caller);
85 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
86 unsigned long start, unsigned long end);
87 extern struct vm_struct *__get_vm_area_caller(unsigned long size,
88 unsigned long flags,
89 unsigned long start, unsigned long end,
90 void *caller);
91 extern struct vm_struct *get_vm_area_node(unsigned long size,
92 unsigned long flags, int node,
93 gfp_t gfp_mask);
94 extern struct vm_struct *remove_vm_area(const void *addr);
95
96 extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
97 struct page ***pages);
98 extern void unmap_kernel_range(unsigned long addr, unsigned long size);
99
100 /* Allocate/destroy a 'vmalloc' VM area. */
101 extern struct vm_struct *alloc_vm_area(size_t size);
102 extern void free_vm_area(struct vm_struct *area);
103
104 /* for /dev/kmem */
105 extern long vread(char *buf, char *addr, unsigned long count);
106 extern long vwrite(char *buf, char *addr, unsigned long count);
107
108 /*
109 * Internals. Dont't use..
110 */
111 extern rwlock_t vmlist_lock;
112 extern struct vm_struct *vmlist;
113
114 #endif /* _LINUX_VMALLOC_H */
115