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TOMOYO Linux Cross Reference
Linux/include/linux/vmalloc.h

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  1 #ifndef _LINUX_VMALLOC_H
  2 #define _LINUX_VMALLOC_H
  3 
  4 #include <linux/spinlock.h>
  5 #include <linux/init.h>
  6 #include <asm/page.h>           /* pgprot_t */
  7 
  8 struct vm_area_struct;          /* vma defining user mapping in mm_types.h */
  9 
 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 */
 18 
 19 /*
 20  * Maximum alignment for ioremap() regions.
 21  * Can be overriden by arch-specific value.
 22  */
 23 #ifndef IOREMAP_MAX_ORDER
 24 #define IOREMAP_MAX_ORDER       (7 + PAGE_SHIFT)        /* 128 pages */
 25 #endif
 26 
 27 struct vm_struct {
 28         struct vm_struct        *next;
 29         void                    *addr;
 30         unsigned long           size;
 31         unsigned long           flags;
 32         struct page             **pages;
 33         unsigned int            nr_pages;
 34         phys_addr_t             phys_addr;
 35         const void              *caller;
 36 };
 37 
 38 /*
 39  *      Highlevel APIs for driver use
 40  */
 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);
 45 
 46 #ifdef CONFIG_MMU
 47 extern void __init vmalloc_init(void);
 48 #else
 49 static inline void vmalloc_init(void)
 50 {
 51 }
 52 #endif
 53 
 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);
 67 
 68 extern void *vmap(struct page **pages, unsigned int count,
 69                         unsigned long flags, pgprot_t prot);
 70 extern void vunmap(const void *addr);
 71 
 72 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
 73                                                         unsigned long pgoff);
 74 void vmalloc_sync_all(void);
 75  
 76 /*
 77  *      Lowlevel-APIs (not for driver use!)
 78  */
 79 
 80 static inline size_t get_vm_area_size(const struct vm_struct *area)
 81 {
 82         /* return actual size without guard page */
 83         return area->size - PAGE_SIZE;
 84 }
 85 
 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,
 92                                         unsigned long flags,
 93                                         unsigned long start, unsigned long end,
 94                                         const void *caller);
 95 extern struct vm_struct *remove_vm_area(const void *addr);
 96 extern struct vm_struct *find_vm_area(const void *addr);
 97 
 98 extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
 99                         struct page ***pages);
100 #ifdef CONFIG_MMU
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);
105 #else
106 static inline int
107 map_kernel_range_noflush(unsigned long start, unsigned long size,
108                         pgprot_t prot, struct page **pages)
109 {
110         return size >> PAGE_SHIFT;
111 }
112 static inline void
113 unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
114 {
115 }
116 static inline void
117 unmap_kernel_range(unsigned long addr, unsigned long size)
118 {
119 }
120 #endif
121 
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);
125 
126 /* for /dev/kmem */
127 extern long vread(char *buf, char *addr, unsigned long count);
128 extern long vwrite(char *buf, char *addr, unsigned long count);
129 
130 /*
131  *      Internals.  Dont't use..
132  */
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);
137 
138 #ifdef CONFIG_SMP
139 # ifdef CONFIG_MMU
140 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
141                                      const size_t *sizes, int nr_vms,
142                                      size_t align);
143 
144 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
145 # else
146 static inline struct vm_struct **
147 pcpu_get_vm_areas(const unsigned long *offsets,
148                 const size_t *sizes, int nr_vms,
149                 size_t align)
150 {
151         return NULL;
152 }
153 
154 static inline void
155 pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
156 {
157 }
158 # endif
159 #endif
160 
161 #endif /* _LINUX_VMALLOC_H */
162 

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