include/linux/vmalloc.h

   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 /* bits [20..32] reserved for arch specific ioremap internals */
  17
  18 /*
  19  * Maximum alignment for ioremap() regions.
  20  * Can be overriden by arch-specific value.
  21  */
  22 #ifndef IOREMAP_MAX_ORDER
  23 #define IOREMAP_MAX_ORDER       (7 + PAGE_SHIFT)        /* 128 pages */
  24 #endif
  25
  26 struct vm_struct {
  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         void                    *caller;
  35 };
  36
  37 /*
  38  *      Highlevel APIs for driver use
  39  */
  40 extern void vm_unmap_ram(const void *mem, unsigned int count);
  41 extern void *vm_map_ram(struct page **pages, unsigned int count,
  42                                 int node, pgprot_t prot);
  43 extern void vm_unmap_aliases(void);
  44
  45 #ifdef CONFIG_MMU
  46 extern void __init vmalloc_init(void);
  47 #else
  48 static inline void vmalloc_init(void)
  49 {
  50 }
  51 #endif
  52
  53 extern void *vmalloc(unsigned long size);
  54 extern void *vmalloc_user(unsigned long size);
  55 extern void *vmalloc_node(unsigned long size, int node);
  56 extern void *vmalloc_exec(unsigned long size);
  57 extern void *vmalloc_32(unsigned long size);
  58 extern void *vmalloc_32_user(unsigned long size);
  59 extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
  60 extern void *__vmalloc_area(struct vm_struct *area, gfp_t gfp_mask,
  61                                 pgprot_t prot);
  62 extern void vfree(const void *addr);
  63
  64 extern void *vmap(struct page **pages, unsigned int count,
  65                         unsigned long flags, pgprot_t prot);
  66 extern void vunmap(const void *addr);
  67
  68 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
  69                                                         unsigned long pgoff);
  70 void vmalloc_sync_all(void);
  71
  72 /*
  73  *      Lowlevel-APIs (not for driver use!)
  74  */
  75
  76 static inline size_t get_vm_area_size(const struct vm_struct *area)
  77 {
  78         /* return actual size without guard page */
  79         return area->size - PAGE_SIZE;
  80 }
  81
  82 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
  83 extern struct vm_struct *get_vm_area_caller(unsigned long size,
  84                                         unsigned long flags, void *caller);
  85 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
  86                                         unsigned long start, unsigned long end);
  87 extern struct vm_struct *get_vm_area_node(unsigned long size,
  88                                           unsigned long flags, int node,
  89                                           gfp_t gfp_mask);
  90 extern struct vm_struct *remove_vm_area(const void *addr);
  91
  92 extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
  93                         struct page ***pages);
  94 extern void unmap_kernel_range(unsigned long addr, unsigned long size);
  95
  96 /* Allocate/destroy a 'vmalloc' VM area. */
  97 extern struct vm_struct *alloc_vm_area(size_t size);
  98 extern void free_vm_area(struct vm_struct *area);
  99
 100 /* for /dev/kmem */
 101 extern long vread(char *buf, char *addr, unsigned long count);
 102 extern long vwrite(char *buf, char *addr, unsigned long count);
 103
 104 /*
 105  *      Internals.  Dont't use..
 106  */
 107 extern rwlock_t vmlist_lock;
 108 extern struct vm_struct *vmlist;
 109
 110 #endif /* _LINUX_VMALLOC_H */