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
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 *vzalloc(unsigned long size);
57extern void *vmalloc_user(unsigned long size);
58extern void *vmalloc_node(unsigned long size, int node);
59extern void *vzalloc_node(unsigned long size, int node);
60extern void *vmalloc_exec(unsigned long size);
61extern void *vmalloc_32(unsigned long size);
62extern void *vmalloc_32_user(unsigned long size);
63extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
64extern void *__vmalloc_area(struct vm_struct *area, gfp_t gfp_mask,
65 pgprot_t prot);
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, 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 void *caller);
95extern struct vm_struct *get_vm_area_node(unsigned long size,
96 unsigned long flags, int node,
97 gfp_t gfp_mask);
98extern struct vm_struct *remove_vm_area(const void *addr);
99
100extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
101 struct page ***pages);
102extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
103 pgprot_t prot, struct page **pages);
104extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
105extern void unmap_kernel_range(unsigned long addr, unsigned long size);
106
107/* Allocate/destroy a 'vmalloc' VM area. */
108extern struct vm_struct *alloc_vm_area(size_t size);
109extern void free_vm_area(struct vm_struct *area);
110
111/* for /dev/kmem */
112extern long vread(char *buf, char *addr, unsigned long count);
113extern long vwrite(char *buf, char *addr, unsigned long count);
114
115/*
116 * Internals. Dont't use..
117 */
118extern rwlock_t vmlist_lock;
119extern struct vm_struct *vmlist;
120extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
121
122#ifdef CONFIG_SMP
123struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
124 const size_t *sizes, int nr_vms,
125 size_t align, gfp_t gfp_mask);
126
127void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
128#endif
129
130#endif /* _LINUX_VMALLOC_H */