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 /* 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 */
20 * Maximum alignment for ioremap() regions.
21 * Can be overriden by arch-specific value.
23 #ifndef IOREMAP_MAX_ORDER
24 #define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */
28 struct vm_struct *next;
33 unsigned int nr_pages;
34 phys_addr_t phys_addr;
39 * Highlevel APIs for driver use
41 extern void vm_unmap_ram(const void *mem, unsigned int count);
42 extern void *vm_map_ram(struct page **pages, unsigned int count,
43 int node, pgprot_t prot);
44 extern void vm_unmap_aliases(void);
47 extern void __init vmalloc_init(void);
49 static inline void vmalloc_init(void)
54 extern void *vmalloc(unsigned long size);
55 extern void *vzalloc(unsigned long size);
56 extern void *vmalloc_user(unsigned long size);
57 extern void *vmalloc_node(unsigned long size, int node);
58 extern void *vzalloc_node(unsigned long size, int node);
59 extern void *vmalloc_exec(unsigned long size);
60 extern void *vmalloc_32(unsigned long size);
61 extern void *vmalloc_32_user(unsigned long size);
62 extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
63 extern 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, const void *caller);
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, const 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 *remove_vm_area(const void *addr);
96 extern struct vm_struct *find_vm_area(const void *addr);
98 extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
99 struct page ***pages);
101 extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
102 pgprot_t prot, struct page **pages);
103 extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
104 extern void unmap_kernel_range(unsigned long addr, unsigned long size);
107 map_kernel_range_noflush(unsigned long start, unsigned long size,
108 pgprot_t prot, struct page **pages)
110 return size >> PAGE_SHIFT;
113 unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
117 unmap_kernel_range(unsigned long addr, unsigned long size)
122 /* Allocate/destroy a 'vmalloc' VM area. */
123 extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
124 extern void free_vm_area(struct vm_struct *area);
127 extern long vread(char *buf, char *addr, unsigned long count);
128 extern long vwrite(char *buf, char *addr, unsigned long count);
131 * Internals. Dont't use..
133 extern rwlock_t vmlist_lock;
134 extern struct vm_struct *vmlist;
135 extern __init void vm_area_add_early(struct vm_struct *vm);
136 extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
140 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
141 const size_t *sizes, int nr_vms,
144 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
146 static inline struct vm_struct **
147 pcpu_get_vm_areas(const unsigned long *offsets,
148 const size_t *sizes, int nr_vms,
155 pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
161 #endif /* _LINUX_VMALLOC_H */