Line data Source code
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
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 :
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 int map_kernel_range_noflush(unsigned long start, unsigned long size,
99 : pgprot_t prot, struct page **pages);
100 : extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
101 : extern void unmap_kernel_range(unsigned long addr, unsigned long size);
102 :
103 : /* Allocate/destroy a 'vmalloc' VM area. */
104 : extern struct vm_struct *alloc_vm_area(size_t size);
105 : extern void free_vm_area(struct vm_struct *area);
106 :
107 : /* for /dev/kmem */
108 : extern long vread(char *buf, char *addr, unsigned long count);
109 : extern long vwrite(char *buf, char *addr, unsigned long count);
110 :
111 : /*
112 : * Internals. Dont't use..
113 : */
114 : extern rwlock_t vmlist_lock;
115 : extern struct vm_struct *vmlist;
116 : extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
117 :
118 : struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
119 : const size_t *sizes, int nr_vms,
120 : size_t align, gfp_t gfp_mask);
121 :
122 : void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
123 1 :
124 : #endif /* _LINUX_VMALLOC_H */
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