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 /* bits in vm_struct->flags */
   8 #define VM_IOREMAP      0x00000001      /* ioremap() and friends */
   9 #define VM_ALLOC        0x00000002      /* vmalloc() */
  10 #define VM_MAP          0x00000004      /* vmap()ed pages */
  11 /* bits [20..32] reserved for arch specific ioremap internals */
  12
  13 /*
  14  * Maximum alignment for ioremap() regions.
  15  * Can be overriden by arch-specific value.
  16  */
  17 #ifndef IOREMAP_MAX_ORDER
  18 #define IOREMAP_MAX_ORDER       (7 + PAGE_SHIFT)        /* 128 pages */
  19 #endif
  20
  21 struct vm_struct {
  22         void                    *addr;
  23         unsigned long           size;
  24         unsigned long           flags;
  25         struct page             **pages;
  26         unsigned int            nr_pages;
  27         unsigned long           phys_addr;
  28         struct vm_struct        *next;
  29 };
  30
  31 /*
  32  *      Highlevel APIs for driver use
  33  */
  34 extern void *vmalloc(unsigned long size);
  35 extern void *vmalloc_exec(unsigned long size);
  36 extern void *vmalloc_32(unsigned long size);
  37 extern void *__vmalloc(unsigned long size, unsigned int __nocast gfp_mask, pgprot_t prot);
  38 extern void *__vmalloc_area(struct vm_struct *area, unsigned int __nocast gfp_mask, pgprot_t prot);
  39 extern void vfree(void *addr);
  40
  41 extern void *vmap(struct page **pages, unsigned int count,
  42                         unsigned long flags, pgprot_t prot);
  43 extern void vunmap(void *addr);
  44
  45 /*
  46  *      Lowlevel-APIs (not for driver use!)
  47  */
  48 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
  49 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
  50                                         unsigned long start, unsigned long end);
  51 extern struct vm_struct *remove_vm_area(void *addr);
  52 extern struct vm_struct *__remove_vm_area(void *addr);
  53 extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
  54                         struct page ***pages);
  55 extern void unmap_vm_area(struct vm_struct *area);
  56
  57 /*
  58  *      Internals.  Dont't use..
  59  */
  60 extern rwlock_t vmlist_lock;
  61 extern struct vm_struct *vmlist;
  62
  63 #endif /* _LINUX_VMALLOC_H */