1 #ifndef _LINUX_VMALLOC_H
2 #define _LINUX_VMALLOC_H
4 #include <linux/spinlock.h>
5 #include <linux/init.h>
6 #include <asm/page.h> /* pgprot_t */
8 struct vm_area_struct
; /* vma defining user mapping in mm_types.h */
10 extern bool vmap_lazy_unmap
;
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 */
21 * Maximum alignment for ioremap() regions.
22 * Can be overriden by arch-specific value.
24 #ifndef IOREMAP_MAX_ORDER
25 #define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */
29 struct vm_struct
*next
;
34 unsigned int nr_pages
;
35 phys_addr_t phys_addr
;
40 * Highlevel APIs for driver use
42 extern void vm_unmap_ram(const void *mem
, unsigned int count
);
43 extern void *vm_map_ram(struct page
**pages
, unsigned int count
,
44 int node
, pgprot_t prot
);
45 extern void vm_unmap_aliases(void);
48 extern void __init
vmalloc_init(void);
50 static inline void vmalloc_init(void)
55 extern void *vmalloc(unsigned long size
);
56 extern void *vzalloc(unsigned long size
);
57 extern void *vmalloc_user(unsigned long size
);
58 extern void *vmalloc_node(unsigned long size
, int node
);
59 extern void *vzalloc_node(unsigned long size
, int node
);
60 extern void *vmalloc_exec(unsigned long size
);
61 extern void *vmalloc_32(unsigned long size
);
62 extern void *vmalloc_32_user(unsigned long size
);
63 extern void *__vmalloc(unsigned long size
, gfp_t gfp_mask
, pgprot_t prot
);
64 extern void *__vmalloc_area(struct vm_struct
*area
, gfp_t gfp_mask
,
66 extern void vfree(const void *addr
);
68 extern void *vmap(struct page
**pages
, unsigned int count
,
69 unsigned long flags
, pgprot_t prot
);
70 extern void vunmap(const void *addr
);
72 extern int remap_vmalloc_range(struct vm_area_struct
*vma
, void *addr
,
74 void vmalloc_sync_all(void);
77 * Lowlevel-APIs (not for driver use!)
80 static inline size_t get_vm_area_size(const struct vm_struct
*area
)
82 /* return actual size without guard page */
83 return area
->size
- PAGE_SIZE
;
86 extern struct vm_struct
*get_vm_area(unsigned long size
, unsigned long flags
);
87 extern struct vm_struct
*get_vm_area_caller(unsigned long size
,
88 unsigned long flags
, void *caller
);
89 extern struct vm_struct
*__get_vm_area(unsigned long size
, unsigned long flags
,
90 unsigned long start
, unsigned long end
);
91 extern struct vm_struct
*__get_vm_area_caller(unsigned long size
,
93 unsigned long start
, unsigned long end
,
95 extern struct vm_struct
*get_vm_area_node(unsigned long size
,
96 unsigned long flags
, int node
,
98 extern struct vm_struct
*remove_vm_area(const void *addr
);
100 extern int map_vm_area(struct vm_struct
*area
, pgprot_t prot
,
101 struct page
***pages
);
102 extern int map_kernel_range_noflush(unsigned long start
, unsigned long size
,
103 pgprot_t prot
, struct page
**pages
);
104 extern void unmap_kernel_range_noflush(unsigned long addr
, unsigned long size
);
105 extern void unmap_kernel_range(unsigned long addr
, unsigned long size
);
107 /* Allocate/destroy a 'vmalloc' VM area. */
108 extern struct vm_struct
*alloc_vm_area(size_t size
);
109 extern void free_vm_area(struct vm_struct
*area
);
112 extern long vread(char *buf
, char *addr
, unsigned long count
);
113 extern long vwrite(char *buf
, char *addr
, unsigned long count
);
116 * Internals. Dont't use..
118 extern rwlock_t vmlist_lock
;
119 extern struct vm_struct
*vmlist
;
120 extern __init
void vm_area_register_early(struct vm_struct
*vm
, size_t align
);
123 struct 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
);
127 void pcpu_free_vm_areas(struct vm_struct
**vms
, int nr_vms
);
130 #endif /* _LINUX_VMALLOC_H */