pmap.c (943a66f3408781554857303901e3021d5fce75ac) pmap.c (6b4ac811ca8134f128cef476e2703bf9b5373016)
1/*
2 * Copyright (c) 1991 Regents of the University of California.
3 * All rights reserved.
4 * Copyright (c) 1994 John S. Dyson
5 * All rights reserved.
6 * Copyright (c) 1994 David Greenman
7 * All rights reserved.
8 *

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34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 * SUCH DAMAGE.
40 *
41 * from: @(#)pmap.c 7.7 (Berkeley) 5/12/91
1/*
2 * Copyright (c) 1991 Regents of the University of California.
3 * All rights reserved.
4 * Copyright (c) 1994 John S. Dyson
5 * All rights reserved.
6 * Copyright (c) 1994 David Greenman
7 * All rights reserved.
8 *

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34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 * SUCH DAMAGE.
40 *
41 * from: @(#)pmap.c 7.7 (Berkeley) 5/12/91
42 * $Id: pmap.c,v 1.20 1994/03/07 11:38:34 davidg Exp $
42 * $Id: pmap.c,v 1.21 1994/03/14 21:54:01 davidg Exp $
43 */
44
45/*
46 * Derived from hp300 version by Mike Hibler, this version by William
47 * Jolitz uses a recursive map [a pde points to the page directory] to
48 * map the page tables using the pagetables themselves. This is done to
49 * reduce the impact on kernel virtual memory for lots of sparse address
50 * space, and to reduce the cost of memory to each process.

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546 */
547 pmap->pm_pdir = (pd_entry_t *) vm_get_pmap();
548
549 /* wire in kernel global address entries */
550 bcopy(PTD+KPTDI, pmap->pm_pdir+KPTDI, NKPT*PTESIZE);
551
552 /* install self-referential address mapping entry */
553 *(int *)(pmap->pm_pdir+PTDPTDI) =
43 */
44
45/*
46 * Derived from hp300 version by Mike Hibler, this version by William
47 * Jolitz uses a recursive map [a pde points to the page directory] to
48 * map the page tables using the pagetables themselves. This is done to
49 * reduce the impact on kernel virtual memory for lots of sparse address
50 * space, and to reduce the cost of memory to each process.

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546 */
547 pmap->pm_pdir = (pd_entry_t *) vm_get_pmap();
548
549 /* wire in kernel global address entries */
550 bcopy(PTD+KPTDI, pmap->pm_pdir+KPTDI, NKPT*PTESIZE);
551
552 /* install self-referential address mapping entry */
553 *(int *)(pmap->pm_pdir+PTDPTDI) =
554 ((int)pmap_extract(kernel_pmap, (vm_offset_t)pmap->pm_pdir)) | PG_V | PG_KW;
554 ((int)pmap_kextract((vm_offset_t)pmap->pm_pdir)) | PG_V | PG_KW;
555
556 pmap->pm_count = 1;
557 simple_lock_init(&pmap->pm_lock);
558}
559
560/*
561 * Retire the given physical map from service.
562 * Should only be called if the map contains

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1290 */
1291 if ((int) npte != (int) *pte) {
1292 *pte = npte;
1293 tlbflush();
1294 }
1295}
1296
1297/*
555
556 pmap->pm_count = 1;
557 simple_lock_init(&pmap->pm_lock);
558}
559
560/*
561 * Retire the given physical map from service.
562 * Should only be called if the map contains

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1290 */
1291 if ((int) npte != (int) *pte) {
1292 *pte = npte;
1293 tlbflush();
1294 }
1295}
1296
1297/*
1298 * add a wired page to the kva
1299 */
1300void
1301pmap_kenter(va, pa)
1302 vm_offset_t va;
1303 register vm_offset_t pa;
1304{
1305 register pt_entry_t *pte;
1306 register pv_entry_t pv, npv;
1307 vm_offset_t opa;
1308 int s;
1309
1310 /*
1311 * Enter on the PV list if part of our managed memory
1312 * Note that we raise IPL while manipulating pv_table
1313 * since pmap_enter can be called at interrupt time.
1314 */
1315
1316 pte = vtopte(va);
1317
1318 opa = pmap_pte_pa(pte);
1319 /*
1320 * Mapping has not changed, must be protection or wiring change.
1321 */
1322 if (opa == pa) {
1323 /*
1324 * Wiring change, just update stats.
1325 * We don't worry about wiring PT pages as they remain
1326 * resident as long as there are valid mappings in them.
1327 * Hence, if a user page is wired, the PT page will be also.
1328 */
1329 if (!pmap_pte_w(pte)) {
1330 kernel_pmap->pm_stats.wired_count++;
1331 }
1332 goto validate;
1333 }
1334
1335 if (opa) {
1336 pmap_remove(kernel_pmap, va, va + PAGE_SIZE);
1337 }
1338
1339 pv = pa_to_pvh(pa);
1340 s = splimp();
1341 /*
1342 * No entries yet, use header as the first entry
1343 */
1344 if (pv->pv_pmap == NULL) {
1345 pv->pv_va = va;
1346 pv->pv_pmap = kernel_pmap;
1347 pv->pv_next = NULL;
1348 }
1349 /*
1350 * There is at least one other VA mapping this page.
1351 * Place this entry after the header.
1352 */
1353 else {
1354 npv = get_pv_entry();
1355 npv->pv_va = va;
1356 npv->pv_pmap = kernel_pmap;
1357 npv->pv_next = pv->pv_next;
1358 pv->pv_next = npv;
1359 }
1360 splx(s);
1361
1362 /*
1363 * Increment counters
1364 */
1365 kernel_pmap->pm_stats.resident_count++;
1366
1367validate:
1368
1369 /*
1370 * Now validate mapping with desired protection/wiring.
1371 */
1372 *pte = (pt_entry_t) ( (int) (pa | PG_RW | PG_V | PG_W));
1373}
1374
1375/*
1298 * this code makes some *MAJOR* assumptions:
1299 * 1. Current pmap & pmap exists.
1300 * 2. Not wired.
1301 * 3. Read access.
1302 * 4. No page table pages.
1303 * 5. Tlbflush is deferred to calling procedure.
1304 * 6. Page IS managed.
1305 * but is *MUCH* faster than pmap_enter...

--- 581 unchanged lines hidden --- 		1376 * this code makes some *MAJOR* assumptions:
1377 * 1. Current pmap & pmap exists.
1378 * 2. Not wired.
1379 * 3. Read access.
1380 * 4. No page table pages.
1381 * 5. Tlbflush is deferred to calling procedure.
1382 * 6. Page IS managed.
1383 * but is *MUCH* faster than pmap_enter...

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