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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_PAGE_H_
#define _VM_PAGE_H_
#include <sys/types.h>
#include <sys/tree.h>
#include <sys/queue.h>
#include <sys/param.h>
#include <sys/spinlock.h>
struct vm_object;
/*
* Represents a single virtual memory page.
*/
struct vm_page {
TAILQ_ENTRY(vm_page) pageq; /* Queue data */
RBT_ENTRY(vm_page) objt; /* Object tree */
paddr_t phys_addr; /* Physical address of page */
struct spinlock lock; /* Page lock */
uint32_t flags; /* Page flags */
off_t offset; /* Offset into object */
};
/* Page flags */
#define PG_VALID BIT(0) /* Has to be set to be valid */
#define PG_CLEAN BIT(1) /* Page has not be written to */
#define PG_REQ BIT(2) /* Page has been requested by someone */
/* Page alloc flags */
#define PALLOC_ZERO BIT(0)
struct vm_page *vm_pagelookup(struct vm_object *obj, off_t off);
struct vm_page *vm_pagealloc(struct vm_object *obj, int flags);
void vm_pagefree(struct vm_object *obj, struct vm_page *pg, int flags);
#endif /* !_VM_PAGE_H_ */
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