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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.
*/
#include <vm/vm_page.h>
#include <vm/vm_obj.h>
#include <vm/physmem.h>
#include <vm/dynalloc.h>
#include <vm/vm.h>
#include <assert.h>
#include <string.h>
RBT_GENERATE(vm_objtree, vm_page, objt, vm_pagecmp);
/*
* Insert a page into an object.
*/
static inline void
vm_pageinsert(struct vm_page *pg, struct vm_object *obp)
{
struct vm_page *tmp;
tmp = RBT_INSERT(vm_objtree, &obp->objt, pg);
__assert(tmp == NULL);
++obp->npages;
}
static inline void
vm_pageremove(struct vm_page *pg, struct vm_object *obp)
{
RBT_REMOVE(vm_objtree, &obp->objt, pg);
--obp->npages;
}
struct vm_page *
vm_pagelookup(struct vm_object *obj, off_t off)
{
struct vm_page tmp;
tmp.offset = off;
return RBT_FIND(vm_objtree, &obj->objt, &tmp);
}
struct vm_page *
vm_pagealloc(struct vm_object *obj, int flags)
{
struct vm_page *tmp;
tmp = dynalloc(sizeof(*tmp));
if (tmp == NULL) {
return NULL;
}
memset(tmp, 0, sizeof(*tmp));
tmp->phys_addr = vm_alloc_frame(1);
tmp->flags |= (PG_VALID | PG_CLEAN);
__assert(tmp->phys_addr != 0);
if (ISSET(flags, PALLOC_ZERO)) {
memset(PHYS_TO_VIRT(tmp->phys_addr), 0, DEFAULT_PAGESIZE);
}
vm_pageinsert(tmp, obj);
return tmp;
}
void
vm_pagefree(struct vm_object *obj, struct vm_page *pg, int flags)
{
__assert(pg->phys_addr != 0);
vm_pageremove(pg, obj);
vm_free_frame(pg->phys_addr, 1);
dynfree(pg);
}
int
vm_pagecmp(const struct vm_page *a, const struct vm_page *b)
{
return (a->offset < b->offset) ? -1 : a->offset > b->offset;
}
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