Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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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 <linux/list.h>
7#include <asm/page.h> /* pgprot_t */
8#include <linux/rbtree.h>
9
10struct vm_area_struct; /* vma defining user mapping in mm_types.h */
11
12/* bits in flags of vmalloc's vm_struct below */
13#define VM_IOREMAP 0x00000001 /* ioremap() and friends */
14#define VM_ALLOC 0x00000002 /* vmalloc() */
15#define VM_MAP 0x00000004 /* vmap()ed pages */
16#define VM_USERMAP 0x00000008 /* suitable for remap_vmalloc_range */
17#define VM_UNINITIALIZED 0x00000020 /* vm_struct is not fully initialized */
18#define VM_NO_GUARD 0x00000040 /* don't add guard page */
19#define VM_KASAN 0x00000080 /* has allocated kasan shadow memory */
20/* bits [20..32] reserved for arch specific ioremap internals */
21
22/*
23 * Maximum alignment for ioremap() regions.
24 * Can be overriden by arch-specific value.
25 */
26#ifndef IOREMAP_MAX_ORDER
27#define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */
28#endif
29
30struct vm_struct {
31 struct vm_struct *next;
32 void *addr;
33 unsigned long size;
34 unsigned long flags;
35 struct page **pages;
36 unsigned int nr_pages;
37 phys_addr_t phys_addr;
38 const void *caller;
39};
40
41struct vmap_area {
42 unsigned long va_start;
43 unsigned long va_end;
44 unsigned long flags;
45 struct rb_node rb_node; /* address sorted rbtree */
46 struct list_head list; /* address sorted list */
47 struct list_head purge_list; /* "lazy purge" list */
48 struct vm_struct *vm;
49 struct rcu_head rcu_head;
50};
51
52/*
53 * Highlevel APIs for driver use
54 */
55extern void vm_unmap_ram(const void *mem, unsigned int count);
56extern void *vm_map_ram(struct page **pages, unsigned int count,
57 int node, pgprot_t prot);
58extern void vm_unmap_aliases(void);
59
60#ifdef CONFIG_MMU
61extern void __init vmalloc_init(void);
62#else
63static inline void vmalloc_init(void)
64{
65}
66#endif
67
68extern void *vmalloc(unsigned long size);
69extern void *vzalloc(unsigned long size);
70extern void *vmalloc_user(unsigned long size);
71extern void *vmalloc_node(unsigned long size, int node);
72extern void *vzalloc_node(unsigned long size, int node);
73extern void *vmalloc_exec(unsigned long size);
74extern void *vmalloc_32(unsigned long size);
75extern void *vmalloc_32_user(unsigned long size);
76extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
77extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
78 unsigned long start, unsigned long end, gfp_t gfp_mask,
79 pgprot_t prot, unsigned long vm_flags, int node,
80 const void *caller);
81
82extern void vfree(const void *addr);
83
84extern void *vmap(struct page **pages, unsigned int count,
85 unsigned long flags, pgprot_t prot);
86extern void vunmap(const void *addr);
87
88extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,
89 unsigned long uaddr, void *kaddr,
90 unsigned long size);
91
92extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
93 unsigned long pgoff);
94void vmalloc_sync_all(void);
95
96/*
97 * Lowlevel-APIs (not for driver use!)
98 */
99
100static inline size_t get_vm_area_size(const struct vm_struct *area)
101{
102 if (!(area->flags & VM_NO_GUARD))
103 /* return actual size without guard page */
104 return area->size - PAGE_SIZE;
105 else
106 return area->size;
107
108}
109
110extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
111extern struct vm_struct *get_vm_area_caller(unsigned long size,
112 unsigned long flags, const void *caller);
113extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
114 unsigned long start, unsigned long end);
115extern struct vm_struct *__get_vm_area_caller(unsigned long size,
116 unsigned long flags,
117 unsigned long start, unsigned long end,
118 const void *caller);
119extern struct vm_struct *remove_vm_area(const void *addr);
120extern struct vm_struct *find_vm_area(const void *addr);
121
122extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
123 struct page **pages);
124#ifdef CONFIG_MMU
125extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
126 pgprot_t prot, struct page **pages);
127extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
128extern void unmap_kernel_range(unsigned long addr, unsigned long size);
129#else
130static inline int
131map_kernel_range_noflush(unsigned long start, unsigned long size,
132 pgprot_t prot, struct page **pages)
133{
134 return size >> PAGE_SHIFT;
135}
136static inline void
137unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
138{
139}
140static inline void
141unmap_kernel_range(unsigned long addr, unsigned long size)
142{
143}
144#endif
145
146/* Allocate/destroy a 'vmalloc' VM area. */
147extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
148extern void free_vm_area(struct vm_struct *area);
149
150/* for /dev/kmem */
151extern long vread(char *buf, char *addr, unsigned long count);
152extern long vwrite(char *buf, char *addr, unsigned long count);
153
154/*
155 * Internals. Dont't use..
156 */
157extern struct list_head vmap_area_list;
158extern __init void vm_area_add_early(struct vm_struct *vm);
159extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
160
161#ifdef CONFIG_SMP
162# ifdef CONFIG_MMU
163struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
164 const size_t *sizes, int nr_vms,
165 size_t align);
166
167void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
168# else
169static inline struct vm_struct **
170pcpu_get_vm_areas(const unsigned long *offsets,
171 const size_t *sizes, int nr_vms,
172 size_t align)
173{
174 return NULL;
175}
176
177static inline void
178pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
179{
180}
181# endif
182#endif
183
184#ifdef CONFIG_MMU
185#define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
186#else
187#define VMALLOC_TOTAL 0UL
188#endif
189
190#endif /* _LINUX_VMALLOC_H */