Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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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 unsigned long 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 *vmalloc_user(unsigned long size);
55extern void *vmalloc_node(unsigned long size, int node);
56extern void *vmalloc_exec(unsigned long size);
57extern void *vmalloc_32(unsigned long size);
58extern void *vmalloc_32_user(unsigned long size);
59extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
60extern void *__vmalloc_area(struct vm_struct *area, gfp_t gfp_mask,
61 pgprot_t prot);
62extern void vfree(const void *addr);
63
64extern void *vmap(struct page **pages, unsigned int count,
65 unsigned long flags, pgprot_t prot);
66extern void vunmap(const void *addr);
67
68extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
69 unsigned long pgoff);
70void vmalloc_sync_all(void);
71
72/*
73 * Lowlevel-APIs (not for driver use!)
74 */
75
76static inline size_t get_vm_area_size(const struct vm_struct *area)
77{
78 /* return actual size without guard page */
79 return area->size - PAGE_SIZE;
80}
81
82extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
83extern struct vm_struct *get_vm_area_caller(unsigned long size,
84 unsigned long flags, void *caller);
85extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
86 unsigned long start, unsigned long end);
87extern struct vm_struct *__get_vm_area_caller(unsigned long size,
88 unsigned long flags,
89 unsigned long start, unsigned long end,
90 void *caller);
91extern struct vm_struct *get_vm_area_node(unsigned long size,
92 unsigned long flags, int node,
93 gfp_t gfp_mask);
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);
98extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
99 pgprot_t prot, struct page **pages);
100extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
101extern void unmap_kernel_range(unsigned long addr, unsigned long size);
102
103/* Allocate/destroy a 'vmalloc' VM area. */
104extern struct vm_struct *alloc_vm_area(size_t size);
105extern void free_vm_area(struct vm_struct *area);
106
107/* for /dev/kmem */
108extern long vread(char *buf, char *addr, unsigned long count);
109extern long vwrite(char *buf, char *addr, unsigned long count);
110
111/*
112 * Internals. Dont't use..
113 */
114extern rwlock_t vmlist_lock;
115extern struct vm_struct *vmlist;
116extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
117
118struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
119 const size_t *sizes, int nr_vms,
120 size_t align, gfp_t gfp_mask);
121
122void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
123
124#endif /* _LINUX_VMALLOC_H */