vmalloc.h 3.97 KB
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#ifndef _LINUX_VMALLOC_H
#define _LINUX_VMALLOC_H

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

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

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

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/*
 * 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

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struct vm_struct {
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	struct vm_struct	*next;
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	void			*addr;
	unsigned long		size;
	unsigned long		flags;
	struct page		**pages;
	unsigned int		nr_pages;
	unsigned long		phys_addr;
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	void			*caller;
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};

/*
 *	Highlevel APIs for driver use
 */
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extern void vm_unmap_ram(const void *mem, unsigned int count);
extern void *vm_map_ram(struct page **pages, unsigned int count,
				int node, pgprot_t prot);
extern void vm_unmap_aliases(void);

#ifdef CONFIG_MMU
extern void __init vmalloc_init(void);
#else
static inline void vmalloc_init(void)
{
}
#endif

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extern void *vmalloc(unsigned long size);
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extern void *vmalloc_user(unsigned long size);
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extern void *vmalloc_node(unsigned long size, int node);
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extern void *vmalloc_exec(unsigned long size);
extern void *vmalloc_32(unsigned long size);
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extern void *vmalloc_32_user(unsigned long size);
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extern void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot);
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extern void *__vmalloc_area(struct vm_struct *area, gfp_t gfp_mask,
				pgprot_t prot);
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extern void vfree(const void *addr);
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extern void *vmap(struct page **pages, unsigned int count,
			unsigned long flags, pgprot_t prot);
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extern void vunmap(const void *addr);
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extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
							unsigned long pgoff);
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void vmalloc_sync_all(void);
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/*
 *	Lowlevel-APIs (not for driver use!)
 */
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static inline size_t get_vm_area_size(const struct vm_struct *area)
{
	/* return actual size without guard page */
	return area->size - PAGE_SIZE;
}

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extern struct vm_struct *get_vm_area(unsigned long size, unsigned long flags);
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extern struct vm_struct *get_vm_area_caller(unsigned long size,
					unsigned long flags, void *caller);
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extern struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
					unsigned long start, unsigned long end);
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extern struct vm_struct *__get_vm_area_caller(unsigned long size,
					unsigned long flags,
					unsigned long start, unsigned long end,
					void *caller);
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extern struct vm_struct *get_vm_area_node(unsigned long size,
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					  unsigned long flags, int node,
					  gfp_t gfp_mask);
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extern struct vm_struct *remove_vm_area(const void *addr);
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extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
			struct page ***pages);
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extern int map_kernel_range_noflush(unsigned long start, unsigned long size,
				    pgprot_t prot, struct page **pages);
extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);
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extern void unmap_kernel_range(unsigned long addr, unsigned long size);
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/* 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);

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/* for /dev/kmem */
extern long vread(char *buf, char *addr, unsigned long count);
extern long vwrite(char *buf, char *addr, unsigned long count);

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/*
 *	Internals.  Dont't use..
 */
extern rwlock_t vmlist_lock;
extern struct vm_struct *vmlist;
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extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);
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struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
				     const size_t *sizes, int nr_vms,
				     size_t align, gfp_t gfp_mask);

void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);

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#endif /* _LINUX_VMALLOC_H */