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