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
10extern bool vmap_lazy_unmap;
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_VPAGES 0x00000010 /* buffer for pages was vmalloc'ed */
18/* bits [20..32] reserved for arch specific ioremap internals */
19
20/*
21 * Maximum alignment for ioremap() regions.
22 * Can be overriden by arch-specific value.
23 */
24#ifndef IOREMAP_MAX_ORDER
25#define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */
26#endif
27
28struct vm_struct {
29 struct vm_struct *next;
30 void *addr;
31 unsigned long size;
32 unsigned long flags;
33 struct page **pages;
34 unsigned int nr_pages;
35 phys_addr_t phys_addr;
36 void *caller;
37};
38
39/*
40 * Highlevel APIs for driver use
41 */
42extern void vm_unmap_ram(const void *mem, unsigned int count);
43extern void *vm_map_ram(struct page **pages, unsigned int count,
44 int node, pgprot_t prot);
45extern void vm_unmap_aliases(void);
46
47#ifdef CONFIG_MMU
48extern void __init vmalloc_init(void);
49#else
50static inline void vmalloc_init(void)
51{
52}
53#endif
54
55extern void *vmalloc(unsigned long size);
56extern void *vmalloc_user(unsigned long size);
57extern void *vmalloc_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_area(struct vm_struct *area, gfp_t gfp_mask,
63 pgprot_t prot);
64extern void vfree(const void *addr);
65
66extern void *vmap(struct page **pages, unsigned int count,
67 unsigned long flags, pgprot_t prot);
68extern void vunmap(const void *addr);
69
70extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
71 unsigned long pgoff);
72void vmalloc_sync_all(void);
73
74/*
75 * Lowlevel-APIs (not for driver use!)
76 */
77
78static inline size_t get_vm_area_size(const struct vm_struct *area)
79{
80 /* return actual size without guard page */
81 return area->size - PAGE_SIZE;
82}
83
84extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
85extern struct vm_struct *get_vm_area_caller(unsigned long size,
86 unsigned long flags, void *caller);
87extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
88 unsigned long start, unsigned long end);
89extern struct vm_struct *__get_vm_area_caller(unsigned long size,
90 unsigned long flags,
91 unsigned long start, unsigned long end,
92 void *caller);
93extern struct vm_struct *get_vm_area_node(unsigned long size,
94 unsigned long flags, int node,
95 gfp_t gfp_mask);
96extern struct vm_struct *remove_vm_area(const void *addr);
97
98extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
99 struct page ***pages);
100extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
101 pgprot_t prot, struct page **pages);
102extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
103extern void unmap_kernel_range(unsigned long addr, unsigned long size);
104
105/* Allocate/destroy a 'vmalloc' VM area. */
106extern struct vm_struct *alloc_vm_area(size_t size);
107extern void free_vm_area(struct vm_struct *area);
108
109/* for /dev/kmem */
110extern long vread(char *buf, char *addr, unsigned long count);
111extern long vwrite(char *buf, char *addr, unsigned long count);
112
113/*
114 * Internals. Dont't use..
115 */
116extern rwlock_t vmlist_lock;
117extern struct vm_struct *vmlist;
118extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
119
120struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
121 const size_t *sizes, int nr_vms,
122 size_t align, gfp_t gfp_mask);
123
124void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
125
126#endif /* _LINUX_VMALLOC_H */