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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         unsigned long           phys_addr;
 35         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 *vmalloc_user(unsigned long size);
 56 extern void *vmalloc_node(unsigned long size, int node);
 57 extern void *vmalloc_exec(unsigned long size);
 58 extern void *vmalloc_32(unsigned long size);
 59 extern void *vmalloc_32_user(unsigned long size);
 60 extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
 61 extern void *__vmalloc_area(struct vm_struct *area, gfp_t gfp_mask,
 62                                 pgprot_t prot);
 63 extern void vfree(const void *addr);
 64 
 65 extern void *vmap(struct page **pages, unsigned int count,
 66                         unsigned long flags, pgprot_t prot);
 67 extern void vunmap(const void *addr);
 68 
 69 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
 70                                                         unsigned long pgoff);
 71 void vmalloc_sync_all(void);
 72  
 73 /*
 74  *      Lowlevel-APIs (not for driver use!)
 75  */
 76 
 77 static inline size_t get_vm_area_size(const struct vm_struct *area)
 78 {
 79         /* return actual size without guard page */
 80         return area->size - PAGE_SIZE;
 81 }
 82 
 83 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
 84 extern struct vm_struct *get_vm_area_caller(unsigned long size,
 85                                         unsigned long flags, void *caller);
 86 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
 87                                         unsigned long start, unsigned long end);
 88 extern struct vm_struct *__get_vm_area_caller(unsigned long size,
 89                                         unsigned long flags,
 90                                         unsigned long start, unsigned long end,
 91                                         void *caller);
 92 extern struct vm_struct *get_vm_area_node(unsigned long size,
 93                                           unsigned long flags, int node,
 94                                           gfp_t gfp_mask);
 95 extern struct vm_struct *remove_vm_area(const void *addr);
 96 
 97 extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
 98                         struct page ***pages);
 99 extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
100                                     pgprot_t prot, struct page **pages);
101 extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
102 extern void unmap_kernel_range(unsigned long addr, unsigned long size);
103 
104 /* Allocate/destroy a 'vmalloc' VM area. */
105 extern struct vm_struct *alloc_vm_area(size_t size);
106 extern void free_vm_area(struct vm_struct *area);
107 
108 /* for /dev/kmem */
109 extern long vread(char *buf, char *addr, unsigned long count);
110 extern long vwrite(char *buf, char *addr, unsigned long count);
111 
112 /*
113  *      Internals.  Dont't use..
114  */
115 extern rwlock_t vmlist_lock;
116 extern struct vm_struct *vmlist;
117 extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
118 
119 #ifndef CONFIG_HAVE_LEGACY_PER_CPU_AREA
120 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
121                                      const size_t *sizes, int nr_vms,
122                                      size_t align, gfp_t gfp_mask);
123 #endif
124 
125 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
126 
127 #endif /* _LINUX_VMALLOC_H */
128 

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