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         phys_addr_t             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 *vzalloc(unsigned long size);
  55 extern void *vmalloc_user(unsigned long size);
  56 extern void *vmalloc_node(unsigned long size, int node);
  57 extern void *vzalloc_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_node_range(unsigned long size, unsigned long align,
  63                         unsigned long start, unsigned long end, gfp_t gfp_mask,
  64                         pgprot_t prot, int node, void *caller);
  65 extern void vfree(const void *addr);
  66
  67 extern void *vmap(struct page **pages, unsigned int count,
  68                         unsigned long flags, pgprot_t prot);
  69 extern void vunmap(const void *addr);
  70
  71 extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
  72                                                         unsigned long pgoff);
  73 void vmalloc_sync_all(void);
  74
  75 /*
  76  *      Lowlevel-APIs (not for driver use!)
  77  */
  78
  79 static inline size_t get_vm_area_size(const struct vm_struct *area)
  80 {
  81         /* return actual size without guard page */
  82         return area->size - PAGE_SIZE;
  83 }
  84
  85 extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
  86 extern struct vm_struct *get_vm_area_caller(unsigned long size,
  87                                         unsigned long flags, void *caller);
  88 extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
  89                                         unsigned long start, unsigned long end);
  90 extern struct vm_struct *__get_vm_area_caller(unsigned long size,
  91                                         unsigned long flags,
  92                                         unsigned long start, unsigned long end,
  93                                         void *caller);
  94 extern struct vm_struct *remove_vm_area(const void *addr);
  95
  96 extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
  97                         struct page ***pages);
  98 #ifdef CONFIG_MMU
  99 extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
 100                                     pgprot_t prot, struct page **pages);
 101 extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
 102 extern void unmap_kernel_range(unsigned long addr, unsigned long size);
 103 #else
 104 static inline int
 105 map_kernel_range_noflush(unsigned long start, unsigned long size,
 106                         pgprot_t prot, struct page **pages)
 107 {
 108         return size >> PAGE_SHIFT;
 109 }
 110 static inline void
 111 unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
 112 {
 113 }
 114 static inline void
 115 unmap_kernel_range(unsigned long addr, unsigned long size)
 116 {
 117 }
 118 #endif
 119
 120 /* Allocate/destroy a 'vmalloc' VM area. */
 121 extern struct vm_struct *alloc_vm_area(size_t size);
 122 extern void free_vm_area(struct vm_struct *area);
 123
 124 /* for /dev/kmem */
 125 extern long vread(char *buf, char *addr, unsigned long count);
 126 extern long vwrite(char *buf, char *addr, unsigned long count);
 127
 128 /*
 129  *      Internals.  Dont't use..
 130  */
 131 extern rwlock_t vmlist_lock;
 132 extern struct vm_struct *vmlist;
 133 extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
 134
 135 #ifdef CONFIG_SMP
 136 # ifdef CONFIG_MMU
 137 struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
 138                                      const size_t *sizes, int nr_vms,
 139                                      size_t align);
 140
 141 void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
 142 # else
 143 static inline struct vm_struct **
 144 pcpu_get_vm_areas(const unsigned long *offsets,
 145                 const size_t *sizes, int nr_vms,
 146                 size_t align)
 147 {
 148         return NULL;
 149 }
 150
 151 static inline void
 152 pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
 153 {
 154 }
 155 # endif
 156 #endif
 157
 158 #endif /* _LINUX_VMALLOC_H */