LXR linux/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
   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/* 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
  26struct 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 */
  40extern void vm_unmap_ram(const void *mem, unsigned int count);
  41extern void *vm_map_ram(struct page **pages, unsigned int count,
  42                                int node, pgprot_t prot);
  43extern void vm_unmap_aliases(void);
  44
  45#ifdef CONFIG_MMU
  46extern void __init vmalloc_init(void);
  47#else
  48static inline void vmalloc_init(void)
  49{
  50}
  51#endif
  52
  53extern void *vmalloc(unsigned long size);
  54extern void *vzalloc(unsigned long size);
  55extern void *vmalloc_user(unsigned long size);
  56extern void *vmalloc_node(unsigned long size, int node);
  57extern void *vzalloc_node(unsigned long size, int node);
  58extern void *vmalloc_exec(unsigned long size);
  59extern void *vmalloc_32(unsigned long size);
  60extern void *vmalloc_32_user(unsigned long size);
  61extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
  62extern 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);
  65extern void vfree(const void *addr);
  66
  67extern void *vmap(struct page **pages, unsigned int count,
  68                        unsigned long flags, pgprot_t prot);
  69extern void vunmap(const void *addr);
  70
  71extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
  72                                                        unsigned long pgoff);
  73void vmalloc_sync_all(void);
  74 
  75/*
  76 *      Lowlevel-APIs (not for driver use!)
  77 */
  78
  79static 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
  85extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
  86extern struct vm_struct *get_vm_area_caller(unsigned long size,
  87                                        unsigned long flags, void *caller);
  88extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
  89                                        unsigned long start, unsigned long end);
  90extern struct vm_struct *__get_vm_area_caller(unsigned long size,
  91                                        unsigned long flags,
  92                                        unsigned long start, unsigned long end,
  93                                        void *caller);
  94extern struct vm_struct *remove_vm_area(const void *addr);
  95
  96extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
  97                        struct page ***pages);
  98extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
  99                                    pgprot_t prot, struct page **pages);
 100extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
 101extern void unmap_kernel_range(unsigned long addr, unsigned long size);
 102
 103/* Allocate/destroy a 'vmalloc' VM area. */
 104extern struct vm_struct *alloc_vm_area(size_t size);
 105extern void free_vm_area(struct vm_struct *area);
 106
 107/* for /dev/kmem */
 108extern long vread(char *buf, char *addr, unsigned long count);
 109extern long vwrite(char *buf, char *addr, unsigned long count);
 110
 111/*
 112 *      Internals.  Dont't use..
 113 */
 114extern rwlock_t vmlist_lock;
 115extern struct vm_struct *vmlist;
 116extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
 117
 118#ifdef CONFIG_SMP
 119struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
 120                                     const size_t *sizes, int nr_vms,
 121                                     size_t align);
 122
 123void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);
 124#endif
 125
 126#endif /* _LINUX_VMALLOC_H */
 127