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#define VM_UNLIST	0x00000020	/* vm_struct is not listed in vmlist */
17/* bits [20..32] reserved for arch specific ioremap internals */
18
19/*
20 * Maximum alignment for ioremap() regions.
21 * Can be overriden by arch-specific value.
22 */
23#ifndef IOREMAP_MAX_ORDER
24#define IOREMAP_MAX_ORDER	(7 + PAGE_SHIFT)	/* 128 pages */
25#endif
26
27struct vm_struct {
28	struct vm_struct	*next;
29	void			*addr;
30	unsigned long		size;
31	unsigned long		flags;
32	struct page		**pages;
33	unsigned int		nr_pages;
34	phys_addr_t		phys_addr;
35	void			*caller;
36};
37
38/*
39 *	Highlevel APIs for driver use
40 */
41extern void vm_unmap_ram(const void *mem, unsigned int count);
42extern void *vm_map_ram(struct page **pages, unsigned int count,
43				int node, pgprot_t prot);
44extern void vm_unmap_aliases(void);
45
46#ifdef CONFIG_MMU
47extern void __init vmalloc_init(void);
48#else
49static inline void vmalloc_init(void)
50{
51}
52#endif
53
54extern void *vmalloc(unsigned long size);
55extern void *vzalloc(unsigned long size);
56extern void *vmalloc_user(unsigned long size);
57extern void *vmalloc_node(unsigned long size, int node);
58extern void *vzalloc_node(unsigned long size, int node);
59extern void *vmalloc_exec(unsigned long size);
60extern void *vmalloc_32(unsigned long size);
61extern void *vmalloc_32_user(unsigned long size);
62extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
63extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
64			unsigned long start, unsigned long end, gfp_t gfp_mask,
65			pgprot_t prot, int node, void *caller);
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 *remove_vm_area(const void *addr);
96
97extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
98			struct page ***pages);
99#ifdef CONFIG_MMU
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#else
105static inline int
106map_kernel_range_noflush(unsigned long start, unsigned long size,
107			pgprot_t prot, struct page **pages)
108{
109	return size >> PAGE_SHIFT;
110}
111static inline void
112unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
113{
114}
115static inline void
116unmap_kernel_range(unsigned long addr, unsigned long size)
117{
118}
119#endif
120
121/* Allocate/destroy a 'vmalloc' VM area. */
122extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
123extern void free_vm_area(struct vm_struct *area);
124
125/* for /dev/kmem */
126extern long vread(char *buf, char *addr, unsigned long count);
127extern long vwrite(char *buf, char *addr, unsigned long count);
128
129/*
130 *	Internals.  Dont't use..
131 */
132extern rwlock_t vmlist_lock;
133extern struct vm_struct *vmlist;
134extern __init void vm_area_add_early(struct vm_struct *vm);
135extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
136
137#ifdef CONFIG_SMP
138# ifdef CONFIG_MMU
139struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
140				     const size_t *sizes, int nr_vms,
141				     size_t align);
142
143void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
144# else
145static inline struct vm_struct **
146pcpu_get_vm_areas(const unsigned long *offsets,
147		const size_t *sizes, int nr_vms,
148		size_t align)
149{
150	return NULL;
151}
152
153static inline void
154pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
155{
156}
157# endif
158#endif
159
160#endif /* _LINUX_VMALLOC_H */
161