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/*
* Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _VM_OBJ_H_
#define _VM_OBJ_H_
#include <sys/spinlock.h>
#include <sys/types.h>
#include <sys/vnode.h>
#include <vm/map.h>
#include <vm/pager.h>
struct vm_object {
struct spinlock lock; /* Protects this object */
struct vm_mapspace mapspace; /* Mapspace this object points to */
struct vm_pagerops *pgops; /* Pager operations */
uint8_t is_anon : 1; /* Is an anonymous mapping */
uint8_t demand : 1; /* Only mapped upon access */
int ref; /* Ref count */
struct vnode *vnode; /* Only used if `is_anon` is 0 */
};
#define vm_object_ref(OBJPTR) (++(OBJPTR)->ref)
#define vm_object_unref(OBJPTR) do { \
if ((OBJPTR)->ref > 1) { \
--(OBJPTR)->ref; \
} \
} while (0);
int vm_obj_init(struct vm_object **res, struct vnode *vnode);
int vm_obj_destroy(struct vm_object *obj);
#endif /* !_VM_OBJ_H_ */
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