Linux kernel mirror (for testing)
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linux
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
8struct 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
27struct 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 */
41extern void vm_unmap_ram(const void *mem, unsigned int count);
42extern void *vm_map_ram(struct page **pages, unsigned int count,
43 int node, pgprot_t prot);
44extern void vm_unmap_aliases(void);
45
46#ifdef CONFIG_MMU
47extern void __init vmalloc_init(void);
48#else
49static inline void vmalloc_init(void)
50{
51}
52#endif
53
54extern void *vmalloc(unsigned long size);
55extern void *vzalloc(unsigned long size);
56extern void *vmalloc_user(unsigned long size);
57extern void *vmalloc_node(unsigned long size, int node);
58extern void *vzalloc_node(unsigned long size, int node);
59extern void *vmalloc_exec(unsigned long size);
60extern void *vmalloc_32(unsigned long size);
61extern void *vmalloc_32_user(unsigned long size);
62extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
63extern 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);
66extern void vfree(const void *addr);
67
68extern void *vmap(struct page **pages, unsigned int count,
69 unsigned long flags, pgprot_t prot);
70extern void vunmap(const void *addr);
71
72extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
73 unsigned long pgoff);
74void vmalloc_sync_all(void);
75
76/*
77 * Lowlevel-APIs (not for driver use!)
78 */
79
80static 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
86extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
87extern struct vm_struct *get_vm_area_caller(unsigned long size,
88 unsigned long flags, const void *caller);
89extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
90 unsigned long start, unsigned long end);
91extern 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);
95extern struct vm_struct *remove_vm_area(const void *addr);
96extern struct vm_struct *find_vm_area(const void *addr);
97
98extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
99 struct page ***pages);
100#ifdef CONFIG_MMU
101extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
102 pgprot_t prot, struct page **pages);
103extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
104extern void unmap_kernel_range(unsigned long addr, unsigned long size);
105#else
106static inline int
107map_kernel_range_noflush(unsigned long start, unsigned long size,
108 pgprot_t prot, struct page **pages)
109{
110 return size >> PAGE_SHIFT;
111}
112static inline void
113unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
114{
115}
116static inline void
117unmap_kernel_range(unsigned long addr, unsigned long size)
118{
119}
120#endif
121
122/* Allocate/destroy a 'vmalloc' VM area. */
123extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
124extern void free_vm_area(struct vm_struct *area);
125
126/* for /dev/kmem */
127extern long vread(char *buf, char *addr, unsigned long count);
128extern long vwrite(char *buf, char *addr, unsigned long count);
129
130/*
131 * Internals. Dont't use..
132 */
133extern rwlock_t vmlist_lock;
134extern struct vm_struct *vmlist;
135extern __init void vm_area_add_early(struct vm_struct *vm);
136extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
137
138#ifdef CONFIG_SMP
139# ifdef CONFIG_MMU
140struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
141 const size_t *sizes, int nr_vms,
142 size_t align);
143
144void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
145# else
146static inline struct vm_struct **
147pcpu_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
154static inline void
155pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
156{
157}
158# endif
159#endif
160
161#endif /* _LINUX_VMALLOC_H */