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/*
* Copyright (c) 2017 Richard Braun.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*
* Virtual memory object.
*
* The purpose of VM objects is to track pages that are resident in
* physical memory. They collectively form the page cache.
*/
#ifndef VM_OBJECT_H
#define VM_OBJECT_H
#include <stdint.h>
#include <kern/init.h>
#include <kern/rdxtree.h>
#include <vm/vm_object_types.h>
#include <vm/vm_page.h>
struct vm_object;
static inline struct vm_object *
vm_object_get_kernel_object(void)
{
extern struct vm_object vm_object_kernel_object;
return &vm_object_kernel_object;
}
/*
* Initialize a VM object.
*/
void vm_object_init(struct vm_object *object, uint64_t size);
/*
* Insert a page into a VM object.
*
* The offset must be page-aligned.
*
* The page becomes managed, and gains a reference. If successful,
* the reference is kept. Otherwise it's dropped. If the page had
* no references on entry, and a failure occurs, the page is freed.
*/
int vm_object_insert(struct vm_object *object, struct vm_page *page,
uint64_t offset);
/*
* Remove pages from a VM object.
*
* The range boundaries must be page-aligned.
*
* Holes in the given range are silently skipped. Pages that are removed
* become unmanaged and lose a reference.
*/
void vm_object_remove(struct vm_object *object, uint64_t start, uint64_t end);
/*
* Look up a page in a VM object.
*
* The offset must be page-aligned.
*
* If successful, the returned page gains a reference. Note that, if a valid
* page is returned, it may already have been removed from the object, or
* moved at a different offset.
*/
struct vm_page * vm_object_lookup(struct vm_object *object, uint64_t offset);
/*
* This init operation provides :
* - module fully initialized
*/
INIT_OP_DECLARE(vm_object_setup);
#endif /* VM_OBJECT_H */
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