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vmalloc.h
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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 #define VM_UNLIST 0x00000020 /* vm_struct is not listed in vmlist */
17 /* bits [20..32] reserved for arch specific ioremap internals */
18 
19 /*
20  * Maximum alignment for ioremap() regions.
21  * Can be overriden by arch-specific value.
22  */
23 #ifndef IOREMAP_MAX_ORDER
24 #define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */
25 #endif
26 
27 struct vm_struct {
28  struct vm_struct *next;
29  void *addr;
30  unsigned long size;
31  unsigned long flags;
32  struct page **pages;
33  unsigned int nr_pages;
34  phys_addr_t phys_addr;
35  const void *caller;
36 };
37 
38 /*
39  * Highlevel APIs for driver use
40  */
41 extern void vm_unmap_ram(const void *mem, unsigned int count);
42 extern void *vm_map_ram(struct page **pages, unsigned int count,
43  int node, pgprot_t prot);
44 extern void vm_unmap_aliases(void);
45 
46 #ifdef CONFIG_MMU
47 extern void __init vmalloc_init(void);
48 #else
49 static inline void vmalloc_init(void)
50 {
51 }
52 #endif
53 
54 extern void *vmalloc(unsigned long size);
55 extern void *vzalloc(unsigned long size);
56 extern void *vmalloc_user(unsigned long size);
57 extern void *vmalloc_node(unsigned long size, int node);
58 extern void *vzalloc_node(unsigned long size, int node);
59 extern void *vmalloc_exec(unsigned long size);
60 extern void *vmalloc_32(unsigned long size);
61 extern void *vmalloc_32_user(unsigned long size);
62 extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
63 extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
64  unsigned long start, unsigned long end, gfp_t gfp_mask,
65  pgprot_t prot, int node, const void *caller);
66 extern void vfree(const void *addr);
67 
68 extern void *vmap(struct page **pages, unsigned int count,
69  unsigned long flags, pgprot_t prot);
70 extern void vunmap(const void *addr);
71 
72 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
73  unsigned long pgoff);
74 void vmalloc_sync_all(void);
75 
76 /*
77  * Lowlevel-APIs (not for driver use!)
78  */
79 
80 static inline size_t get_vm_area_size(const struct vm_struct *area)
81 {
82  /* return actual size without guard page */
83  return area->size - PAGE_SIZE;
84 }
85 
86 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
87 extern struct vm_struct *get_vm_area_caller(unsigned long size,
88  unsigned long flags, const void *caller);
89 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
90  unsigned long start, unsigned long end);
91 extern struct vm_struct *__get_vm_area_caller(unsigned long size,
92  unsigned long flags,
93  unsigned long start, unsigned long end,
94  const void *caller);
95 extern struct vm_struct *remove_vm_area(const void *addr);
96 extern struct vm_struct *find_vm_area(const void *addr);
97 
98 extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
99  struct page ***pages);
100 #ifdef CONFIG_MMU
101 extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
102  pgprot_t prot, struct page **pages);
103 extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
104 extern void unmap_kernel_range(unsigned long addr, unsigned long size);
105 #else
106 static inline int
107 map_kernel_range_noflush(unsigned long start, unsigned long size,
108  pgprot_t prot, struct page **pages)
109 {
110  return size >> PAGE_SHIFT;
111 }
112 static inline void
113 unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
114 {
115 }
116 static inline void
117 unmap_kernel_range(unsigned long addr, unsigned long size)
118 {
119 }
120 #endif
121 
122 /* Allocate/destroy a 'vmalloc' VM area. */
123 extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
124 extern void free_vm_area(struct vm_struct *area);
125 
126 /* for /dev/kmem */
127 extern long vread(char *buf, char *addr, unsigned long count);
128 extern long vwrite(char *buf, char *addr, unsigned long count);
129 
130 /*
131  * Internals. Dont't use..
132  */
133 extern rwlock_t vmlist_lock;
134 extern struct vm_struct *vmlist;
135 extern __init void vm_area_add_early(struct vm_struct *vm);
136 extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
137 
138 #ifdef CONFIG_SMP
139 # ifdef CONFIG_MMU
140 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
141  const size_t *sizes, int nr_vms,
142  size_t align);
143 
144 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
145 # else
146 static inline struct vm_struct **
147 pcpu_get_vm_areas(const unsigned long *offsets,
148  const size_t *sizes, int nr_vms,
149  size_t align)
150 {
151  return NULL;
152 }
153 
154 static inline void
155 pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
156 {
157 }
158 # endif
159 #endif
160 
161 #endif /* _LINUX_VMALLOC_H */
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