1 #ifndef _LINUX_VMALLOC_H
2 #define _LINUX_VMALLOC_H
4 #include <linux/spinlock.h>
5 #include <linux/init.h>
6 #include <linux/list.h>
7 #include <asm/page.h> /* pgprot_t */
8 #include <linux/rbtree.h>
10 struct vm_area_struct
; /* vma defining user mapping in mm_types.h */
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 #define VM_UNLIST 0x00000020 /* vm_struct is not listed in vmlist */
19 /* bits [20..32] reserved for arch specific ioremap internals */
22 * Maximum alignment for ioremap() regions.
23 * Can be overriden by arch-specific value.
25 #ifndef IOREMAP_MAX_ORDER
26 #define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */
30 struct vm_struct
*next
;
35 unsigned int nr_pages
;
36 phys_addr_t phys_addr
;
41 unsigned long va_start
;
44 struct rb_node rb_node
; /* address sorted rbtree */
45 struct list_head list
; /* address sorted list */
46 struct list_head purge_list
; /* "lazy purge" list */
48 struct rcu_head rcu_head
;
52 * Highlevel APIs for driver use
54 extern void vm_unmap_ram(const void *mem
, unsigned int count
);
55 extern void *vm_map_ram(struct page
**pages
, unsigned int count
,
56 int node
, pgprot_t prot
);
57 extern void vm_unmap_aliases(void);
60 extern void __init
vmalloc_init(void);
62 static inline void vmalloc_init(void)
67 extern void *vmalloc(unsigned long size
);
68 extern void *vzalloc(unsigned long size
);
69 extern void *vmalloc_user(unsigned long size
);
70 extern void *vmalloc_node(unsigned long size
, int node
);
71 extern void *vzalloc_node(unsigned long size
, int node
);
72 extern void *vmalloc_exec(unsigned long size
);
73 extern void *vmalloc_32(unsigned long size
);
74 extern void *vmalloc_32_user(unsigned long size
);
75 extern void *__vmalloc(unsigned long size
, gfp_t gfp_mask
, pgprot_t prot
);
76 extern void *__vmalloc_node_range(unsigned long size
, unsigned long align
,
77 unsigned long start
, unsigned long end
, gfp_t gfp_mask
,
78 pgprot_t prot
, int node
, const void *caller
);
79 extern void vfree(const void *addr
);
81 extern void *vmap(struct page
**pages
, unsigned int count
,
82 unsigned long flags
, pgprot_t prot
);
83 extern void vunmap(const void *addr
);
85 extern int remap_vmalloc_range(struct vm_area_struct
*vma
, void *addr
,
87 void vmalloc_sync_all(void);
90 * Lowlevel-APIs (not for driver use!)
93 static inline size_t get_vm_area_size(const struct vm_struct
*area
)
95 /* return actual size without guard page */
96 return area
->size
- PAGE_SIZE
;
99 extern struct vm_struct
*get_vm_area(unsigned long size
, unsigned long flags
);
100 extern struct vm_struct
*get_vm_area_caller(unsigned long size
,
101 unsigned long flags
, const void *caller
);
102 extern struct vm_struct
*__get_vm_area(unsigned long size
, unsigned long flags
,
103 unsigned long start
, unsigned long end
);
104 extern struct vm_struct
*__get_vm_area_caller(unsigned long size
,
106 unsigned long start
, unsigned long end
,
108 extern struct vm_struct
*remove_vm_area(const void *addr
);
109 extern struct vm_struct
*find_vm_area(const void *addr
);
111 extern int map_vm_area(struct vm_struct
*area
, pgprot_t prot
,
112 struct page
***pages
);
114 extern int map_kernel_range_noflush(unsigned long start
, unsigned long size
,
115 pgprot_t prot
, struct page
**pages
);
116 extern void unmap_kernel_range_noflush(unsigned long addr
, unsigned long size
);
117 extern void unmap_kernel_range(unsigned long addr
, unsigned long size
);
120 map_kernel_range_noflush(unsigned long start
, unsigned long size
,
121 pgprot_t prot
, struct page
**pages
)
123 return size
>> PAGE_SHIFT
;
126 unmap_kernel_range_noflush(unsigned long addr
, unsigned long size
)
130 unmap_kernel_range(unsigned long addr
, unsigned long size
)
135 /* Allocate/destroy a 'vmalloc' VM area. */
136 extern struct vm_struct
*alloc_vm_area(size_t size
, pte_t
**ptes
);
137 extern void free_vm_area(struct vm_struct
*area
);
140 extern long vread(char *buf
, char *addr
, unsigned long count
);
141 extern long vwrite(char *buf
, char *addr
, unsigned long count
);
144 * Internals. Dont't use..
146 extern struct list_head vmap_area_list
;
147 extern __init
void vm_area_add_early(struct vm_struct
*vm
);
148 extern __init
void vm_area_register_early(struct vm_struct
*vm
, size_t align
);
152 struct vm_struct
**pcpu_get_vm_areas(const unsigned long *offsets
,
153 const size_t *sizes
, int nr_vms
,
156 void pcpu_free_vm_areas(struct vm_struct
**vms
, int nr_vms
);
158 static inline struct vm_struct
**
159 pcpu_get_vm_areas(const unsigned long *offsets
,
160 const size_t *sizes
, int nr_vms
,
167 pcpu_free_vm_areas(struct vm_struct
**vms
, int nr_vms
)
173 struct vmalloc_info
{
175 unsigned long largest_chunk
;
179 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
180 extern void get_vmalloc_info(struct vmalloc_info
*vmi
);
183 #define VMALLOC_TOTAL 0UL
184 #define get_vmalloc_info(vmi) \
187 (vmi)->largest_chunk = 0; \
191 #endif /* _LINUX_VMALLOC_H */
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