root/include/linux/vmalloc.h

INCLUDED FROM

DEFINITIONS

1. get_vm_area_size

#ifndef _LINUX_VMALLOC_H
#define _LINUX_VMALLOC_H

#include <linux/spinlock.h>
#include <asm/page.h>           /* pgprot_t */

struct vm_area_struct;          /* vma defining user mapping in mm_types.h */

/* bits in flags of vmalloc's vm_struct below */
#define VM_IOREMAP      0x00000001      /* ioremap() and friends */
#define VM_ALLOC        0x00000002      /* vmalloc() */
#define VM_MAP          0x00000004      /* vmap()ed pages */
#define VM_USERMAP      0x00000008      /* suitable for remap_vmalloc_range */
#define VM_VPAGES       0x00000010      /* buffer for pages was vmalloc'ed */
/* bits [20..32] reserved for arch specific ioremap internals */

/*
 * Maximum alignment for ioremap() regions.
 * Can be overriden by arch-specific value.
 */
#ifndef IOREMAP_MAX_ORDER
#define IOREMAP_MAX_ORDER       (7 + PAGE_SHIFT)        /* 128 pages */
#endif

struct vm_struct {
        /* keep next,addr,size together to speedup lookups */
        struct vm_struct        *next;
        void                    *addr;
        unsigned long           size;
        unsigned long           flags;
        struct page             **pages;
        unsigned int            nr_pages;
        unsigned long           phys_addr;
        void                    *caller;
};

/*
 *      Highlevel APIs for driver use
 */
extern void *vmalloc(unsigned long size);
extern void *vmalloc_user(unsigned long size);
extern void *vmalloc_node(unsigned long size, int node);
extern void *vmalloc_exec(unsigned long size);
extern void *vmalloc_32(unsigned long size);
extern void *vmalloc_32_user(unsigned long size);
extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
extern void *__vmalloc_area(struct vm_struct *area, gfp_t gfp_mask,
                                pgprot_t prot);
extern void vfree(const void *addr);

extern void *vmap(struct page **pages, unsigned int count,
                        unsigned long flags, pgprot_t prot);
extern void vunmap(const void *addr);

extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
                                                        unsigned long pgoff);
void vmalloc_sync_all(void);
 
/*
 *      Lowlevel-APIs (not for driver use!)
 */

static inline size_t get_vm_area_size(const struct vm_struct *area)
{
        /* return actual size without guard page */
        return area->size - PAGE_SIZE;
}

extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
extern struct vm_struct *get_vm_area_caller(unsigned long size,
                                        unsigned long flags, void *caller);
extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
                                        unsigned long start, unsigned long end);
extern struct vm_struct *get_vm_area_node(unsigned long size,
                                          unsigned long flags, int node,
                                          gfp_t gfp_mask);
extern struct vm_struct *remove_vm_area(const void *addr);

extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
                        struct page ***pages);
extern void unmap_kernel_range(unsigned long addr, unsigned long size);

/* Allocate/destroy a 'vmalloc' VM area. */
extern struct vm_struct *alloc_vm_area(size_t size);
extern void free_vm_area(struct vm_struct *area);

/*
 *      Internals.  Dont't use..
 */
extern rwlock_t vmlist_lock;
extern struct vm_struct *vmlist;

extern const struct seq_operations vmalloc_op;

#endif /* _LINUX_VMALLOC_H */