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 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
vmalloc_init(void)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, 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
get_vm_area_size(const struct vm_struct * area)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, 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 void *caller);
95 extern struct vm_struct *remove_vm_area(const void *addr);
96
97 extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
98 struct page ***pages);
99 #ifdef CONFIG_MMU
100 extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
101 pgprot_t prot, struct page **pages);
102 extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
103 extern void unmap_kernel_range(unsigned long addr, unsigned long size);
104 #else
105 static inline int
map_kernel_range_noflush(unsigned long start,unsigned long size,pgprot_t prot,struct page ** pages)106 map_kernel_range_noflush(unsigned long start, unsigned long size,
107 pgprot_t prot, struct page **pages)
108 {
109 return size >> PAGE_SHIFT;
110 }
111 static inline void
unmap_kernel_range_noflush(unsigned long addr,unsigned long size)112 unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
113 {
114 }
115 static inline void
unmap_kernel_range(unsigned long addr,unsigned long size)116 unmap_kernel_range(unsigned long addr, unsigned long size)
117 {
118 }
119 #endif
120
121 /* Allocate/destroy a 'vmalloc' VM area. */
122 extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
123 extern void free_vm_area(struct vm_struct *area);
124
125 /* for /dev/kmem */
126 extern long vread(char *buf, char *addr, unsigned long count);
127 extern long vwrite(char *buf, char *addr, unsigned long count);
128
129 /*
130 * Internals. Dont't use..
131 */
132 extern rwlock_t vmlist_lock;
133 extern struct vm_struct *vmlist;
134 extern __init void vm_area_add_early(struct vm_struct *vm);
135 extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
136
137 #ifdef CONFIG_SMP
138 # ifdef CONFIG_MMU
139 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
140 const size_t *sizes, int nr_vms,
141 size_t align);
142
143 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
144 # else
145 static inline struct vm_struct **
pcpu_get_vm_areas(const unsigned long * offsets,const size_t * sizes,int nr_vms,size_t align)146 pcpu_get_vm_areas(const unsigned long *offsets,
147 const size_t *sizes, int nr_vms,
148 size_t align)
149 {
150 return NULL;
151 }
152
153 static inline void
pcpu_free_vm_areas(struct vm_struct ** vms,int nr_vms)154 pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
155 {
156 }
157 # endif
158 #endif
159
160 #endif /* _LINUX_VMALLOC_H */
161