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