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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ifndef _VM_HMENT_H
#define _VM_HMENT_H
#ifdef __cplusplus
extern "C" {
#endif
struct hment;
typedef struct hment hment_t;
#if defined(_KERNEL)
/*
* Remove a page mapping, finds the matching mapping and unlinks it from
* the page_t. If it returns a non-NULL pointer, the pointer must be
* freed via hment_free() after doing x86_hm_exit().
*/
extern hment_t *hment_remove(page_t *, htable_t *ht, uint_t entry);
extern void hment_free(hment_t *);
/*
* Iterator to walk through all mappings of a page.
*/
extern hment_t *hment_walk(page_t *, htable_t **, uint_t *, hment_t *);
/*
* Prepare a page for a new mapping
*/
extern hment_t *hment_prepare(htable_t *ht, uint_t entry, page_t *);
/*
* Add a mapping to a page's mapping list
*/
extern void hment_assign(htable_t *ht, uint_t entry, page_t *, hment_t *);
/*
* initialize hment data structures
*/
extern void hment_init(void);
/*
* lock/unlock a page_t's mapping list/pte entry
*/
extern void x86_hm_enter(page_t *);
extern void x86_hm_exit(page_t *);
extern int x86_hm_held(page_t *pp);
/*
* Called to allocate additional hments for reserve.
*
* The hment_reserve_count is exported for use by htable_hment_steal()
*/
extern void hment_reserve(uint_t);
extern uint_t hment_reserve_count;
/*
* Used to readjust the hment reserve after the reserve list has been used.
* Also called after boot to release left over boot reserves.
*/
extern void hment_adjust_reserve(void);
/*
* Return the number of mappings of a page_t
*/
extern uint_t hment_mapcnt(page_t *);
#endif /* _KERNEL */
#ifdef __cplusplus
}
#endif
#endif /* _VM_HMENT_H */
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