include/linux/vmalloc.h

   1 #ifndef _LINUX_VMALLOC_H
   2 #define _LINUX_VMALLOC_H
   3
   4 #include <linux/spinlock.h>
   5 #include <asm/page.h>           /* pgprot_t */
   6
   7 struct vm_area_struct;
   8
   9 /* bits in vm_struct->flags */
  10 #define VM_IOREMAP      0x00000001      /* ioremap() and friends */
  11 #define VM_ALLOC        0x00000002      /* vmalloc() */
  12 #define VM_MAP          0x00000004      /* vmap()ed pages */
  13 #define VM_USERMAP      0x00000008      /* suitable for remap_vmalloc_range */
  14 #define VM_VPAGES       0x00000010      /* buffer for pages was vmalloc'ed */
  15 /* bits [20..32] reserved for arch specific ioremap internals */
  16
  17 /*
  18  * Maximum alignment for ioremap() regions.
  19  * Can be overriden by arch-specific value.
  20  */
  21 #ifndef IOREMAP_MAX_ORDER
  22 #define IOREMAP_MAX_ORDER       (7 + PAGE_SHIFT)        /* 128 pages */
  23 #endif
  24
  25 struct vm_struct {
  26         /* keep next,addr,size together to speedup lookups */
  27         struct vm_struct        *next;
  28         void                    *addr;
  29         unsigned long           size;
  30         unsigned long           flags;
  31         struct page             **pages;
  32         unsigned int            nr_pages;
  33         unsigned long           phys_addr;
  34 };
  35
  36 /*
  37  *      Highlevel APIs for driver use
  38  */
  39 extern void *vmalloc(unsigned long size);
  40 extern void *vmalloc_user(unsigned long size);
  41 extern void *vmalloc_node(unsigned long size, int node);
  42 extern void *vmalloc_exec(unsigned long size);
  43 extern void *vmalloc_32(unsigned long size);
  44 extern void *vmalloc_32_user(unsigned long size);
  45 extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
  46 extern void *__vmalloc_area(struct vm_struct *area, gfp_t gfp_mask,
  47                                 pgprot_t prot);
  48 extern void vfree(const void *addr);
  49
  50 extern void *vmap(struct page **pages, unsigned int count,
  51                         unsigned long flags, pgprot_t prot);
  52 extern void vunmap(const void *addr);
  53
  54 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
  55                                                         unsigned long pgoff);
  56 void vmalloc_sync_all(void);
  57
  58 /*
  59  *      Lowlevel-APIs (not for driver use!)
  60  */
  61
  62 static inline size_t get_vm_area_size(const struct vm_struct *area)
  63 {
  64         /* return actual size without guard page */
  65         return area->size - PAGE_SIZE;
  66 }
  67
  68 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
  69 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
  70                                         unsigned long start, unsigned long end);
  71 extern struct vm_struct *get_vm_area_node(unsigned long size,
  72                                           unsigned long flags, int node,
  73                                           gfp_t gfp_mask);
  74 extern struct vm_struct *remove_vm_area(const void *addr);
  75
  76 extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
  77                         struct page ***pages);
  78 extern void unmap_kernel_range(unsigned long addr, unsigned long size);
  79
  80 /* Allocate/destroy a 'vmalloc' VM area. */
  81 extern struct vm_struct *alloc_vm_area(size_t size);
  82 extern void free_vm_area(struct vm_struct *area);
  83
  84 /*
  85  *      Internals.  Dont't use..
  86  */
  87 extern rwlock_t vmlist_lock;
  88 extern struct vm_struct *vmlist;
  89
  90 #endif /* _LINUX_VMALLOC_H */