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- /* $OpenBSD: uvm_object.c,v 1.12 2014/12/17 19:42:15 tedu Exp $ */
- /*
- * Copyright (c) 2006 The NetBSD Foundation, Inc.
- * All rights reserved.
- *
- * This code is derived from software contributed to The NetBSD Foundation
- * by Mindaugas Rasiukevicius.
- *
- * 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.
- *
- * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
- */
- /*
- * uvm_object.c: operate with memory objects
- *
- */
- #include <sys/param.h>
- #include <sys/mman.h>
- #include <sys/atomic.h>
- #include <uvm/uvm.h>
- /* We will fetch this page count per step */
- #define FETCH_PAGECOUNT 16
- /*
- * uvm_objinit: initialise a uvm object.
- */
- void
- uvm_objinit(struct uvm_object *uobj, struct uvm_pagerops *pgops, int refs)
- {
- uobj->pgops = pgops;
- RB_INIT(&uobj->memt);
- uobj->uo_npages = 0;
- uobj->uo_refs = refs;
- }
- #ifndef SMALL_KERNEL
- /*
- * uvm_objwire: wire the pages of entire uobj
- *
- * => caller must pass page-aligned start and end values
- * => if the caller passes in a pageq pointer, we'll return a list of
- * wired pages.
- */
- int
- uvm_objwire(struct uvm_object *uobj, voff_t start, voff_t end,
- struct pglist *pageq)
- {
- int i, npages, left, error;
- struct vm_page *pgs[FETCH_PAGECOUNT];
- voff_t offset = start;
- left = (end - start) >> PAGE_SHIFT;
- while (left) {
- npages = MIN(FETCH_PAGECOUNT, left);
- /* Get the pages */
- memset(pgs, 0, sizeof(pgs));
- error = (*uobj->pgops->pgo_get)(uobj, offset, pgs, &npages, 0,
- PROT_READ | PROT_WRITE, MADV_SEQUENTIAL,
- PGO_ALLPAGES | PGO_SYNCIO);
- if (error)
- goto error;
- for (i = 0; i < npages; i++) {
- KASSERT(pgs[i] != NULL);
- KASSERT(!(pgs[i]->pg_flags & PG_RELEASED));
- #if 0
- /*
- * Loan break
- */
- if (pgs[i]->loan_count) {
- while (pgs[i]->loan_count) {
- pg = uvm_loanbreak(pgs[i]);
- if (!pg) {
- uvm_wait("uobjwirepg");
- continue;
- }
- }
- pgs[i] = pg;
- }
- #endif
- if (pgs[i]->pg_flags & PQ_AOBJ) {
- atomic_clearbits_int(&pgs[i]->pg_flags,
- PG_CLEAN);
- uao_dropswap(uobj, i);
- }
- }
- /* Wire the pages */
- uvm_lock_pageq();
- for (i = 0; i < npages; i++) {
- uvm_pagewire(pgs[i]);
- if (pageq != NULL)
- TAILQ_INSERT_TAIL(pageq, pgs[i], pageq);
- }
- uvm_unlock_pageq();
- /* Unbusy the pages */
- uvm_page_unbusy(pgs, npages);
- left -= npages;
- offset += (voff_t)npages << PAGE_SHIFT;
- }
- return 0;
- error:
- /* Unwire the pages which have been wired */
- uvm_objunwire(uobj, start, offset);
- return error;
- }
- /*
- * uobj_unwirepages: unwire the pages of entire uobj
- *
- * => caller must pass page-aligned start and end values
- */
- void
- uvm_objunwire(struct uvm_object *uobj, voff_t start, voff_t end)
- {
- struct vm_page *pg;
- off_t offset;
- uvm_lock_pageq();
- for (offset = start; offset < end; offset += PAGE_SIZE) {
- pg = uvm_pagelookup(uobj, offset);
- KASSERT(pg != NULL);
- KASSERT(!(pg->pg_flags & PG_RELEASED));
- uvm_pageunwire(pg);
- }
- uvm_unlock_pageq();
- }
- #endif /* !SMALL_KERNEL */
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