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_UNINITIALIZED 0x00000020 /* vm_struct is not fully initialized */
19 #define VM_NO_GUARD 0x00000040 /* don't add guard page */
20 #define VM_KASAN 0x00000080 /* has allocated kasan shadow memory */
21 /* bits [20..32] reserved for arch specific ioremap internals */
24 * Maximum alignment for ioremap() regions.
25 * Can be overriden by arch-specific value.
27 #ifndef IOREMAP_MAX_ORDER
28 #define IOREMAP_MAX_ORDER (7 + PAGE_SHIFT) /* 128 pages */
32 struct vm_struct *next;
37 unsigned int nr_pages;
38 phys_addr_t phys_addr;
43 unsigned long va_start;
46 struct rb_node rb_node; /* address sorted rbtree */
47 struct list_head list; /* address sorted list */
48 struct list_head purge_list; /* "lazy purge" list */
50 struct rcu_head rcu_head;
54 * Highlevel APIs for driver use
56 extern void vm_unmap_ram(const void *mem, unsigned int count);
57 extern void *vm_map_ram(struct page **pages, unsigned int count,
58 int node, pgprot_t prot);
59 extern void vm_unmap_aliases(void);
62 extern void __init vmalloc_init(void);
64 static inline void vmalloc_init(void)
69 extern void *vmalloc(unsigned long size);
70 extern void *vzalloc(unsigned long size);
71 extern void *vmalloc_user(unsigned long size);
72 extern void *vmalloc_node(unsigned long size, int node);
73 extern void *vzalloc_node(unsigned long size, int node);
74 extern void *vmalloc_exec(unsigned long size);
75 extern void *vmalloc_32(unsigned long size);
76 extern void *vmalloc_32_user(unsigned long size);
77 extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
78 extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
79 unsigned long start, unsigned long end, gfp_t gfp_mask,
80 pgprot_t prot, unsigned long vm_flags, int node,
83 extern void vfree(const void *addr);
85 extern void *vmap(struct page **pages, unsigned int count,
86 unsigned long flags, pgprot_t prot);
87 extern void vunmap(const void *addr);
89 extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,
90 unsigned long uaddr, void *kaddr,
93 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
95 void vmalloc_sync_all(void);
98 * Lowlevel-APIs (not for driver use!)
101 static inline size_t get_vm_area_size(const struct vm_struct *area)
103 if (!(area->flags & VM_NO_GUARD))
104 /* return actual size without guard page */
105 return area->size - PAGE_SIZE;
111 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
112 extern struct vm_struct *get_vm_area_caller(unsigned long size,
113 unsigned long flags, const void *caller);
114 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
115 unsigned long start, unsigned long end);
116 extern struct vm_struct *__get_vm_area_caller(unsigned long size,
118 unsigned long start, unsigned long end,
120 extern struct vm_struct *remove_vm_area(const void *addr);
121 extern struct vm_struct *find_vm_area(const void *addr);
123 extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
124 struct page **pages);
126 extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
127 pgprot_t prot, struct page **pages);
128 extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
129 extern void unmap_kernel_range(unsigned long addr, unsigned long size);
132 map_kernel_range_noflush(unsigned long start, unsigned long size,
133 pgprot_t prot, struct page **pages)
135 return size >> PAGE_SHIFT;
138 unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
142 unmap_kernel_range(unsigned long addr, unsigned long size)
147 /* Allocate/destroy a 'vmalloc' VM area. */
148 extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
149 extern void free_vm_area(struct vm_struct *area);
152 extern long vread(char *buf, char *addr, unsigned long count);
153 extern long vwrite(char *buf, char *addr, unsigned long count);
156 * Internals. Dont't use..
158 extern struct list_head vmap_area_list;
159 extern __init void vm_area_add_early(struct vm_struct *vm);
160 extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
164 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
165 const size_t *sizes, int nr_vms,
168 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
170 static inline struct vm_struct **
171 pcpu_get_vm_areas(const unsigned long *offsets,
172 const size_t *sizes, int nr_vms,
179 pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
185 struct vmalloc_info {
187 unsigned long largest_chunk;
191 #define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
192 extern void get_vmalloc_info(struct vmalloc_info *vmi);
195 #define VMALLOC_TOTAL 0UL
196 #define get_vmalloc_info(vmi) \
199 (vmi)->largest_chunk = 0; \
203 #endif /* _LINUX_VMALLOC_H */