linux/include/linux/vmalloc.h
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   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
   8struct 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#define VM_UNLIST       0x00000020      /* vm_struct is not listed in vmlist */
  17/* bits [20..32] reserved for arch specific ioremap internals */
  18
  19/*
  20 * Maximum alignment for ioremap() regions.
  21 * Can be overriden by arch-specific value.
  22 */
  23#ifndef IOREMAP_MAX_ORDER
  24#define IOREMAP_MAX_ORDER       (7 + PAGE_SHIFT)        /* 128 pages */
  25#endif
  26
  27struct vm_struct {
  28        struct vm_struct        *next;
  29        void                    *addr;
  30        unsigned long           size;
  31        unsigned long           flags;
  32        struct page             **pages;
  33        unsigned int            nr_pages;
  34        phys_addr_t             phys_addr;
  35        const void              *caller;
  36};
  37
  38/*
  39 *      Highlevel APIs for driver use
  40 */
  41extern void vm_unmap_ram(const void *mem, unsigned int count);
  42extern void *vm_map_ram(struct page **pages, unsigned int count,
  43                                int node, pgprot_t prot);
  44extern void vm_unmap_aliases(void);
  45
  46#ifdef CONFIG_MMU
  47extern void __init vmalloc_init(void);
  48#else
  49static inline void vmalloc_init(void)
  50{
  51}
  52#endif
  53
  54extern void *vmalloc(unsigned long size);
  55extern void *vzalloc(unsigned long size);
  56extern void *vmalloc_user(unsigned long size);
  57extern void *vmalloc_node(unsigned long size, int node);
  58extern void *vzalloc_node(unsigned long size, int node);
  59extern void *vmalloc_exec(unsigned long size);
  60extern void *vmalloc_32(unsigned long size);
  61extern void *vmalloc_32_user(unsigned long size);
  62extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
  63extern void *__vmalloc_node_range(unsigned long size, unsigned long align,
  64                        unsigned long start, unsigned long end, gfp_t gfp_mask,
  65                        pgprot_t prot, int node, const void *caller);
  66extern void vfree(const void *addr);
  67
  68extern void *vmap(struct page **pages, unsigned int count,
  69                        unsigned long flags, pgprot_t prot);
  70extern void vunmap(const void *addr);
  71
  72extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
  73                                                        unsigned long pgoff);
  74void vmalloc_sync_all(void);
  75 
  76/*
  77 *      Lowlevel-APIs (not for driver use!)
  78 */
  79
  80static inline size_t get_vm_area_size(const struct vm_struct *area)
  81{
  82        /* return actual size without guard page */
  83        return area->size - PAGE_SIZE;
  84}
  85
  86extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
  87extern struct vm_struct *get_vm_area_caller(unsigned long size,
  88                                        unsigned long flags, const void *caller);
  89extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
  90                                        unsigned long start, unsigned long end);
  91extern struct vm_struct *__get_vm_area_caller(unsigned long size,
  92                                        unsigned long flags,
  93                                        unsigned long start, unsigned long end,
  94                                        const void *caller);
  95extern struct vm_struct *remove_vm_area(const void *addr);
  96extern struct vm_struct *find_vm_area(const void *addr);
  97
  98extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
  99                        struct page ***pages);
 100#ifdef CONFIG_MMU
 101extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
 102                                    pgprot_t prot, struct page **pages);
 103extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
 104extern void unmap_kernel_range(unsigned long addr, unsigned long size);
 105#else
 106static inline int
 107map_kernel_range_noflush(unsigned long start, unsigned long size,
 108                        pgprot_t prot, struct page **pages)
 109{
 110        return size >> PAGE_SHIFT;
 111}
 112static inline void
 113unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
 114{
 115}
 116static inline void
 117unmap_kernel_range(unsigned long addr, unsigned long size)
 118{
 119}
 120#endif
 121
 122/* Allocate/destroy a 'vmalloc' VM area. */
 123extern struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes);
 124extern void free_vm_area(struct vm_struct *area);
 125
 126/* for /dev/kmem */
 127extern long vread(char *buf, char *addr, unsigned long count);
 128extern long vwrite(char *buf, char *addr, unsigned long count);
 129
 130/*
 131 *      Internals.  Dont't use..
 132 */
 133extern rwlock_t vmlist_lock;
 134extern struct vm_struct *vmlist;
 135extern __init void vm_area_add_early(struct vm_struct *vm);
 136extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
 137
 138#ifdef CONFIG_SMP
 139# ifdef CONFIG_MMU
 140struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
 141                                     const size_t *sizes, int nr_vms,
 142                                     size_t align);
 143
 144void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
 145# else
 146static inline struct vm_struct **
 147pcpu_get_vm_areas(const unsigned long *offsets,
 148                const size_t *sizes, int nr_vms,
 149                size_t align)
 150{
 151        return NULL;
 152}
 153
 154static inline void
 155pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
 156{
 157}
 158# endif
 159#endif
 160
 161#endif /* _LINUX_VMALLOC_H */
 162
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