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 <linux/llist.h>
8 #include <asm/page.h> /* pgprot_t */
9 #include <linux/rbtree.h>
11 struct vm_area_struct; /* vma defining user mapping in mm_types.h */
12 struct notifier_block; /* in notifier.h */
14 /* bits in flags of vmalloc's vm_struct below */
15 #define VM_IOREMAP 0x00000001 /* ioremap() and friends */
16 #define VM_ALLOC 0x00000002 /* vmalloc() */
17 #define VM_MAP 0x00000004 /* vmap()ed pages */
18 #define VM_USERMAP 0x00000008 /* suitable for remap_vmalloc_range */
19 #define VM_UNINITIALIZED 0x00000020 /* vm_struct is not fully initialized */
20 #define VM_NO_GUARD 0x00000040 /* don't add guard page */
21 #define VM_KASAN 0x00000080 /* has allocated kasan shadow memory */
22 /* bits [20..32] reserved for arch specific ioremap internals */
25 * Maximum alignment for ioremap() regions.
26 * Can be overriden by arch-specific value.
28 #ifndef IOREMAP_MAX_ORDER
29 #define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */
33 struct vm_struct *next;
38 unsigned int nr_pages;
39 phys_addr_t phys_addr;
44 unsigned long va_start;
47 struct rb_node rb_node; /* address sorted rbtree */
48 struct list_head list; /* address sorted list */
49 struct llist_node purge_list; /* "lazy purge" list */
51 struct rcu_head rcu_head;
55 * Highlevel APIs for driver use
57 extern void vm_unmap_ram(const void *mem, unsigned int count);
58 extern void *vm_map_ram(struct page **pages, unsigned int count,
59 int node, pgprot_t prot);
60 extern void vm_unmap_aliases(void);
63 extern void __init vmalloc_init(void);
65 static inline void vmalloc_init(void)
70 extern void *vmalloc(unsigned long size);
71 extern void *vzalloc(unsigned long size);
72 extern void *vmalloc_user(unsigned long size);
73 extern void *vmalloc_node(unsigned long size, int node);
74 extern void *vzalloc_node(unsigned long size, int node);
75 extern void *vmalloc_exec(unsigned long size);
76 extern void *vmalloc_32(unsigned long size);
77 extern void *vmalloc_32_user(unsigned long size);
78 extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
79 extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
80 unsigned long start, unsigned long end, gfp_t gfp_mask,
81 pgprot_t prot, unsigned long vm_flags, int node,
84 extern void vfree(const void *addr);
86 extern void *vmap(struct page **pages, unsigned int count,
87 unsigned long flags, pgprot_t prot);
88 extern void vunmap(const void *addr);
90 extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,
91 unsigned long uaddr, void *kaddr,
94 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
96 void vmalloc_sync_all(void);
99 * Lowlevel-APIs (not for driver use!)
102 static inline size_t get_vm_area_size(const struct vm_struct *area)
104 if (!(area->flags & VM_NO_GUARD))
105 /* return actual size without guard page */
106 return area->size - PAGE_SIZE;
112 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
113 extern struct vm_struct *get_vm_area_caller(unsigned long size,
114 unsigned long flags, const void *caller);
115 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
116 unsigned long start, unsigned long end);
117 extern struct vm_struct *__get_vm_area_caller(unsigned long size,
119 unsigned long start, unsigned long end,
121 extern struct vm_struct *remove_vm_area(const void *addr);
122 extern struct vm_struct *find_vm_area(const void *addr);
124 extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
125 struct page **pages);
127 extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
128 pgprot_t prot, struct page **pages);
129 extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
130 extern void unmap_kernel_range(unsigned long addr, unsigned long size);
133 map_kernel_range_noflush(unsigned long start, unsigned long size,
134 pgprot_t prot, struct page **pages)
136 return size >> PAGE_SHIFT;
139 unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
143 unmap_kernel_range(unsigned long addr, unsigned long size)
148 /* Allocate/destroy a 'vmalloc' VM area. */
149 extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
150 extern void free_vm_area(struct vm_struct *area);
153 extern long vread(char *buf, char *addr, unsigned long count);
154 extern long vwrite(char *buf, char *addr, unsigned long count);
157 * Internals. Dont't use..
159 extern struct list_head vmap_area_list;
160 extern __init void vm_area_add_early(struct vm_struct *vm);
161 extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
165 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
166 const size_t *sizes, int nr_vms,
169 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
171 static inline struct vm_struct **
172 pcpu_get_vm_areas(const unsigned long *offsets,
173 const size_t *sizes, int nr_vms,
180 pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
187 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
189 #define VMALLOC_TOTAL 0UL
192 int register_vmap_purge_notifier(struct notifier_block *nb);
193 int unregister_vmap_purge_notifier(struct notifier_block *nb);
195 #endif /* _LINUX_VMALLOC_H */