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         void                    *addr;
  27         unsigned long           size;
  28         unsigned long           flags;
  29         struct page             **pages;
  30         unsigned int            nr_pages;
  31         unsigned long           phys_addr;
  32         struct vm_struct        *next;
  33 };
  34
  35 /*
  36  *      Highlevel APIs for driver use
  37  */
  38 extern void *vmalloc(unsigned long size);
  39 extern void *vmalloc_user(unsigned long size);
  40 extern void *vmalloc_node(unsigned long size, int node);
  41 extern void *vmalloc_exec(unsigned long size);
  42 extern void *vmalloc_32(unsigned long size);
  43 extern void *vmalloc_32_user(unsigned long size);
  44 extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
  45 extern void *__vmalloc_area(struct vm_struct *area, gfp_t gfp_mask,
  46                                 pgprot_t prot);
  47 extern void vfree(void *addr);
  48
  49 extern void *vmap(struct page **pages, unsigned int count,
  50                         unsigned long flags, pgprot_t prot);
  51 extern void vunmap(void *addr);
  52
  53 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
  54                                                         unsigned long pgoff);
  55
  56 /*
  57  *      Lowlevel-APIs (not for driver use!)
  58  */
  59 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
  60 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
  61                                         unsigned long start, unsigned long end);
  62 extern struct vm_struct *get_vm_area_node(unsigned long size,
  63                                         unsigned long flags, int node);
  64 extern struct vm_struct *remove_vm_area(void *addr);
  65 extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
  66                         struct page ***pages);
  67 extern void unmap_vm_area(struct vm_struct *area);
  68
  69 /*
  70  *      Internals.  Dont't use..
  71  */
  72 extern rwlock_t vmlist_lock;
  73 extern struct vm_struct *vmlist;
  74
  75 #endif /* _LINUX_VMALLOC_H */