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 extern bool vmap_lazy_unmap;
  11
  12 /* bits in flags of vmalloc's vm_struct below */
  13 #define VM_IOREMAP      0x00000001      /* ioremap() and friends */
  14 #define VM_ALLOC        0x00000002      /* vmalloc() */
  15 #define VM_MAP          0x00000004      /* vmap()ed pages */
  16 #define VM_USERMAP      0x00000008      /* suitable for remap_vmalloc_range */
  17 #define VM_VPAGES       0x00000010      /* buffer for pages was vmalloc'ed */
  18 /* bits [20..32] reserved for arch specific ioremap internals */
  19
  20 /*
  21  * Maximum alignment for ioremap() regions.
  22  * Can be overriden by arch-specific value.
  23  */
  24 #ifndef IOREMAP_MAX_ORDER
  25 #define IOREMAP_MAX_ORDER       (7 + PAGE_SHIFT)        /* 128 pages */
  26 #endif
  27
  28 struct vm_struct {
  29         struct vm_struct        *next;
  30         void                    *addr;
  31         unsigned long           size;
  32         unsigned long           flags;
  33         struct page             **pages;
  34         unsigned int            nr_pages;
  35         phys_addr_t             phys_addr;
  36         void                    *caller;
  37 };
  38
  39 /*
  40  *      Highlevel APIs for driver use
  41  */
  42 extern void vm_unmap_ram(const void *mem, unsigned int count);
  43 extern void *vm_map_ram(struct page **pages, unsigned int count,
  44                                 int node, pgprot_t prot);
  45 extern void vm_unmap_aliases(void);
  46
  47 #ifdef CONFIG_MMU
  48 extern void __init vmalloc_init(void);
  49 #else
  50 static inline void vmalloc_init(void)
  51 {
  52 }
  53 #endif
  54
  55 extern void *vmalloc(unsigned long size);
  56 extern void *vmalloc_user(unsigned long size);
  57 extern void *vmalloc_node(unsigned long size, int node);
  58 extern void *vmalloc_exec(unsigned long size);
  59 extern void *vmalloc_32(unsigned long size);
  60 extern void *vmalloc_32_user(unsigned long size);
  61 extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
  62 extern void *__vmalloc_area(struct vm_struct *area, gfp_t gfp_mask,
  63                                 pgprot_t prot);
  64 extern void vfree(const void *addr);
  65
  66 extern void *vmap(struct page **pages, unsigned int count,
  67                         unsigned long flags, pgprot_t prot);
  68 extern void vunmap(const void *addr);
  69
  70 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
  71                                                         unsigned long pgoff);
  72 void vmalloc_sync_all(void);
  73
  74 /*
  75  *      Lowlevel-APIs (not for driver use!)
  76  */
  77
  78 static inline size_t get_vm_area_size(const struct vm_struct *area)
  79 {
  80         /* return actual size without guard page */
  81         return area->size - PAGE_SIZE;
  82 }
  83
  84 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
  85 extern struct vm_struct *get_vm_area_caller(unsigned long size,
  86                                         unsigned long flags, void *caller);
  87 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
  88                                         unsigned long start, unsigned long end);
  89 extern struct vm_struct *__get_vm_area_caller(unsigned long size,
  90                                         unsigned long flags,
  91                                         unsigned long start, unsigned long end,
  92                                         void *caller);
  93 extern struct vm_struct *get_vm_area_node(unsigned long size,
  94                                           unsigned long flags, int node,
  95                                           gfp_t gfp_mask);
  96 extern struct vm_struct *remove_vm_area(const void *addr);
  97
  98 extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
  99                         struct page ***pages);
 100 extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
 101                                     pgprot_t prot, struct page **pages);
 102 extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
 103 extern void unmap_kernel_range(unsigned long addr, unsigned long size);
 104
 105 /* Allocate/destroy a 'vmalloc' VM area. */
 106 extern struct vm_struct *alloc_vm_area(size_t size);
 107 extern void free_vm_area(struct vm_struct *area);
 108
 109 /* for /dev/kmem */
 110 extern long vread(char *buf, char *addr, unsigned long count);
 111 extern long vwrite(char *buf, char *addr, unsigned long count);
 112
 113 /*
 114  *      Internals.  Dont't use..
 115  */
 116 extern rwlock_t vmlist_lock;
 117 extern struct vm_struct *vmlist;
 118 extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
 119
 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
 124 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
 125
 126 #endif /* _LINUX_VMALLOC_H */