FreeBSD/Linux Kernel Cross Reference
sys/pci/agp.c
1 /*-
2 * Copyright (c) 2000 Doug Rabson
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: releng/5.0/sys/pci/agp.c 106860 2002-11-13 17:40:15Z mux $
27 */
28
29 #include "opt_bus.h"
30
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/malloc.h>
34 #include <sys/kernel.h>
35 #include <sys/bus.h>
36 #include <sys/conf.h>
37 #include <sys/ioccom.h>
38 #include <sys/agpio.h>
39 #include <sys/lock.h>
40 #include <sys/lockmgr.h>
41 #include <sys/mutex.h>
42 #include <sys/proc.h>
43
44 #include <pci/pcivar.h>
45 #include <pci/pcireg.h>
46 #include <pci/agppriv.h>
47 #include <pci/agpvar.h>
48 #include <pci/agpreg.h>
49
50 #include <vm/vm.h>
51 #include <vm/vm_object.h>
52 #include <vm/vm_page.h>
53 #include <vm/vm_pageout.h>
54 #include <vm/pmap.h>
55
56 #include <machine/md_var.h>
57 #include <machine/bus.h>
58 #include <machine/resource.h>
59 #include <sys/rman.h>
60
61 MODULE_VERSION(agp, 1);
62
63 MALLOC_DEFINE(M_AGP, "agp", "AGP data structures");
64
65 #define CDEV_MAJOR 148
66 /* agp_drv.c */
67 static d_open_t agp_open;
68 static d_close_t agp_close;
69 static d_ioctl_t agp_ioctl;
70 static d_mmap_t agp_mmap;
71
72 static struct cdevsw agp_cdevsw = {
73 /* open */ agp_open,
74 /* close */ agp_close,
75 /* read */ noread,
76 /* write */ nowrite,
77 /* ioctl */ agp_ioctl,
78 /* poll */ nopoll,
79 /* mmap */ agp_mmap,
80 /* strategy */ nostrategy,
81 /* name */ "agp",
82 /* maj */ CDEV_MAJOR,
83 /* dump */ nodump,
84 /* psize */ nopsize,
85 /* flags */ D_TTY,
86 };
87
88 static devclass_t agp_devclass;
89 #define KDEV2DEV(kdev) devclass_get_device(agp_devclass, minor(kdev))
90
91 /* Helper functions for implementing chipset mini drivers. */
92
93 void
94 agp_flush_cache()
95 {
96 #ifdef __i386__
97 wbinvd();
98 #endif
99 }
100
101 u_int8_t
102 agp_find_caps(device_t dev)
103 {
104 u_int32_t status;
105 u_int8_t ptr, next;
106
107 /*
108 * Check the CAP_LIST bit of the PCI status register first.
109 */
110 status = pci_read_config(dev, PCIR_STATUS, 2);
111 if (!(status & 0x10))
112 return 0;
113
114 /*
115 * Traverse the capabilities list.
116 */
117 for (ptr = pci_read_config(dev, AGP_CAPPTR, 1);
118 ptr != 0;
119 ptr = next) {
120 u_int32_t capid = pci_read_config(dev, ptr, 4);
121 next = AGP_CAPID_GET_NEXT_PTR(capid);
122
123 /*
124 * If this capability entry ID is 2, then we are done.
125 */
126 if (AGP_CAPID_GET_CAP_ID(capid) == 2)
127 return ptr;
128 }
129
130 return 0;
131 }
132
133 /*
134 * Find an AGP display device (if any).
135 */
136 static device_t
137 agp_find_display(void)
138 {
139 devclass_t pci = devclass_find("pci");
140 device_t bus, dev = 0;
141 device_t *kids;
142 int busnum, numkids, i;
143
144 for (busnum = 0; busnum < devclass_get_maxunit(pci); busnum++) {
145 bus = devclass_get_device(pci, busnum);
146 if (!bus)
147 continue;
148 device_get_children(bus, &kids, &numkids);
149 for (i = 0; i < numkids; i++) {
150 dev = kids[i];
151 if (pci_get_class(dev) == PCIC_DISPLAY
152 && pci_get_subclass(dev) == PCIS_DISPLAY_VGA)
153 if (agp_find_caps(dev)) {
154 free(kids, M_TEMP);
155 return dev;
156 }
157
158 }
159 free(kids, M_TEMP);
160 }
161
162 return 0;
163 }
164
165 struct agp_gatt *
166 agp_alloc_gatt(device_t dev)
167 {
168 u_int32_t apsize = AGP_GET_APERTURE(dev);
169 u_int32_t entries = apsize >> AGP_PAGE_SHIFT;
170 struct agp_gatt *gatt;
171
172 if (bootverbose)
173 device_printf(dev,
174 "allocating GATT for aperture of size %dM\n",
175 apsize / (1024*1024));
176
177 gatt = malloc(sizeof(struct agp_gatt), M_AGP, M_NOWAIT);
178 if (!gatt)
179 return 0;
180
181 gatt->ag_entries = entries;
182 gatt->ag_virtual = contigmalloc(entries * sizeof(u_int32_t), M_AGP, 0,
183 0, ~0, PAGE_SIZE, 0);
184 if (!gatt->ag_virtual) {
185 if (bootverbose)
186 device_printf(dev, "contiguous allocation failed\n");
187 free(gatt, M_AGP);
188 return 0;
189 }
190 bzero(gatt->ag_virtual, entries * sizeof(u_int32_t));
191 gatt->ag_physical = vtophys((vm_offset_t) gatt->ag_virtual);
192 agp_flush_cache();
193
194 return gatt;
195 }
196
197 void
198 agp_free_gatt(struct agp_gatt *gatt)
199 {
200 contigfree(gatt->ag_virtual,
201 gatt->ag_entries * sizeof(u_int32_t), M_AGP);
202 free(gatt, M_AGP);
203 }
204
205 static int agp_max[][2] = {
206 {0, 0},
207 {32, 4},
208 {64, 28},
209 {128, 96},
210 {256, 204},
211 {512, 440},
212 {1024, 942},
213 {2048, 1920},
214 {4096, 3932}
215 };
216 #define agp_max_size (sizeof(agp_max) / sizeof(agp_max[0]))
217
218 int
219 agp_generic_attach(device_t dev)
220 {
221 struct agp_softc *sc = device_get_softc(dev);
222 int rid, memsize, i;
223
224 /*
225 * Find and map the aperture.
226 */
227 rid = AGP_APBASE;
228 sc->as_aperture = bus_alloc_resource(dev, SYS_RES_MEMORY, &rid,
229 0, ~0, 1, RF_ACTIVE);
230 if (!sc->as_aperture)
231 return ENOMEM;
232
233 /*
234 * Work out an upper bound for agp memory allocation. This
235 * uses a heurisitc table from the Linux driver.
236 */
237 memsize = ptoa(Maxmem) >> 20;
238 for (i = 0; i < agp_max_size; i++) {
239 if (memsize <= agp_max[i][0])
240 break;
241 }
242 if (i == agp_max_size) i = agp_max_size - 1;
243 sc->as_maxmem = agp_max[i][1] << 20U;
244
245 /*
246 * The lock is used to prevent re-entry to
247 * agp_generic_bind_memory() since that function can sleep.
248 */
249 lockinit(&sc->as_lock, PZERO|PCATCH, "agplk", 0, 0);
250
251 /*
252 * Initialise stuff for the userland device.
253 */
254 agp_devclass = devclass_find("agp");
255 TAILQ_INIT(&sc->as_memory);
256 sc->as_nextid = 1;
257
258 sc->as_devnode = make_dev(&agp_cdevsw,
259 device_get_unit(dev),
260 UID_ROOT,
261 GID_WHEEL,
262 0600,
263 "agpgart");
264
265 return 0;
266 }
267
268 int
269 agp_generic_detach(device_t dev)
270 {
271 struct agp_softc *sc = device_get_softc(dev);
272 bus_release_resource(dev, SYS_RES_MEMORY, AGP_APBASE, sc->as_aperture);
273 lockmgr(&sc->as_lock, LK_DRAIN, 0, curthread);
274 lockdestroy(&sc->as_lock);
275 destroy_dev(sc->as_devnode);
276 agp_flush_cache();
277 return 0;
278 }
279
280 int
281 agp_generic_enable(device_t dev, u_int32_t mode)
282 {
283 device_t mdev = agp_find_display();
284 u_int32_t tstatus, mstatus;
285 u_int32_t command;
286 int rq, sba, fw, rate;;
287
288 if (!mdev) {
289 AGP_DPF("can't find display\n");
290 return ENXIO;
291 }
292
293 tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
294 mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
295
296 /* Set RQ to the min of mode, tstatus and mstatus */
297 rq = AGP_MODE_GET_RQ(mode);
298 if (AGP_MODE_GET_RQ(tstatus) < rq)
299 rq = AGP_MODE_GET_RQ(tstatus);
300 if (AGP_MODE_GET_RQ(mstatus) < rq)
301 rq = AGP_MODE_GET_RQ(mstatus);
302
303 /* Set SBA if all three can deal with SBA */
304 sba = (AGP_MODE_GET_SBA(tstatus)
305 & AGP_MODE_GET_SBA(mstatus)
306 & AGP_MODE_GET_SBA(mode));
307
308 /* Similar for FW */
309 fw = (AGP_MODE_GET_FW(tstatus)
310 & AGP_MODE_GET_FW(mstatus)
311 & AGP_MODE_GET_FW(mode));
312
313 /* Figure out the max rate */
314 rate = (AGP_MODE_GET_RATE(tstatus)
315 & AGP_MODE_GET_RATE(mstatus)
316 & AGP_MODE_GET_RATE(mode));
317 if (rate & AGP_MODE_RATE_4x)
318 rate = AGP_MODE_RATE_4x;
319 else if (rate & AGP_MODE_RATE_2x)
320 rate = AGP_MODE_RATE_2x;
321 else
322 rate = AGP_MODE_RATE_1x;
323
324 /* Construct the new mode word and tell the hardware */
325 command = AGP_MODE_SET_RQ(0, rq);
326 command = AGP_MODE_SET_SBA(command, sba);
327 command = AGP_MODE_SET_FW(command, fw);
328 command = AGP_MODE_SET_RATE(command, rate);
329 command = AGP_MODE_SET_AGP(command, 1);
330 pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, command, 4);
331 pci_write_config(mdev, agp_find_caps(mdev) + AGP_COMMAND, command, 4);
332
333 return 0;
334 }
335
336 struct agp_memory *
337 agp_generic_alloc_memory(device_t dev, int type, vm_size_t size)
338 {
339 struct agp_softc *sc = device_get_softc(dev);
340 struct agp_memory *mem;
341
342 if ((size & (AGP_PAGE_SIZE - 1)) != 0)
343 return 0;
344
345 if (sc->as_allocated + size > sc->as_maxmem)
346 return 0;
347
348 if (type != 0) {
349 printf("agp_generic_alloc_memory: unsupported type %d\n",
350 type);
351 return 0;
352 }
353
354 mem = malloc(sizeof *mem, M_AGP, M_WAITOK);
355 mem->am_id = sc->as_nextid++;
356 mem->am_size = size;
357 mem->am_type = 0;
358 mem->am_obj = vm_object_allocate(OBJT_DEFAULT, atop(round_page(size)));
359 mem->am_physical = 0;
360 mem->am_offset = 0;
361 mem->am_is_bound = 0;
362 TAILQ_INSERT_TAIL(&sc->as_memory, mem, am_link);
363 sc->as_allocated += size;
364
365 return mem;
366 }
367
368 int
369 agp_generic_free_memory(device_t dev, struct agp_memory *mem)
370 {
371 struct agp_softc *sc = device_get_softc(dev);
372
373 if (mem->am_is_bound)
374 return EBUSY;
375
376 sc->as_allocated -= mem->am_size;
377 TAILQ_REMOVE(&sc->as_memory, mem, am_link);
378 vm_object_deallocate(mem->am_obj);
379 free(mem, M_AGP);
380 return 0;
381 }
382
383 int
384 agp_generic_bind_memory(device_t dev, struct agp_memory *mem,
385 vm_offset_t offset)
386 {
387 struct agp_softc *sc = device_get_softc(dev);
388 vm_offset_t i, j, k;
389 vm_page_t m;
390 int error;
391
392 lockmgr(&sc->as_lock, LK_EXCLUSIVE, 0, curthread);
393
394 if (mem->am_is_bound) {
395 device_printf(dev, "memory already bound\n");
396 return EINVAL;
397 }
398
399 if (offset < 0
400 || (offset & (AGP_PAGE_SIZE - 1)) != 0
401 || offset + mem->am_size > AGP_GET_APERTURE(dev)) {
402 device_printf(dev, "binding memory at bad offset %#x\n",
403 (int) offset);
404 return EINVAL;
405 }
406
407 /*
408 * Bind the individual pages and flush the chipset's
409 * TLB.
410 *
411 * XXX Presumably, this needs to be the pci address on alpha
412 * (i.e. use alpha_XXX_dmamap()). I don't have access to any
413 * alpha AGP hardware to check.
414 */
415 for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
416 /*
417 * Find a page from the object and wire it
418 * down. This page will be mapped using one or more
419 * entries in the GATT (assuming that PAGE_SIZE >=
420 * AGP_PAGE_SIZE. If this is the first call to bind,
421 * the pages will be allocated and zeroed.
422 */
423 m = vm_page_grab(mem->am_obj, OFF_TO_IDX(i),
424 VM_ALLOC_WIRED | VM_ALLOC_ZERO | VM_ALLOC_RETRY);
425 if ((m->flags & PG_ZERO) == 0)
426 pmap_zero_page(m);
427 AGP_DPF("found page pa=%#x\n", VM_PAGE_TO_PHYS(m));
428
429 /*
430 * Install entries in the GATT, making sure that if
431 * AGP_PAGE_SIZE < PAGE_SIZE and mem->am_size is not
432 * aligned to PAGE_SIZE, we don't modify too many GATT
433 * entries.
434 */
435 for (j = 0; j < PAGE_SIZE && i + j < mem->am_size;
436 j += AGP_PAGE_SIZE) {
437 vm_offset_t pa = VM_PAGE_TO_PHYS(m) + j;
438 AGP_DPF("binding offset %#x to pa %#x\n",
439 offset + i + j, pa);
440 error = AGP_BIND_PAGE(dev, offset + i + j, pa);
441 if (error) {
442 /*
443 * Bail out. Reverse all the mappings
444 * and unwire the pages.
445 */
446 vm_page_wakeup(m);
447 for (k = 0; k < i + j; k += AGP_PAGE_SIZE)
448 AGP_UNBIND_PAGE(dev, offset + k);
449 for (k = 0; k <= i; k += PAGE_SIZE) {
450 m = vm_page_lookup(mem->am_obj,
451 OFF_TO_IDX(k));
452 vm_page_lock_queues();
453 vm_page_unwire(m, 0);
454 vm_page_unlock_queues();
455 }
456 lockmgr(&sc->as_lock, LK_RELEASE, 0, curthread);
457 return error;
458 }
459 }
460 vm_page_wakeup(m);
461 }
462
463 /*
464 * Flush the cpu cache since we are providing a new mapping
465 * for these pages.
466 */
467 agp_flush_cache();
468
469 /*
470 * Make sure the chipset gets the new mappings.
471 */
472 AGP_FLUSH_TLB(dev);
473
474 mem->am_offset = offset;
475 mem->am_is_bound = 1;
476
477 lockmgr(&sc->as_lock, LK_RELEASE, 0, curthread);
478
479 return 0;
480 }
481
482 int
483 agp_generic_unbind_memory(device_t dev, struct agp_memory *mem)
484 {
485 struct agp_softc *sc = device_get_softc(dev);
486 vm_page_t m;
487 int i;
488
489 lockmgr(&sc->as_lock, LK_EXCLUSIVE, 0, curthread);
490
491 if (!mem->am_is_bound) {
492 device_printf(dev, "memory is not bound\n");
493 return EINVAL;
494 }
495
496
497 /*
498 * Unbind the individual pages and flush the chipset's
499 * TLB. Unwire the pages so they can be swapped.
500 */
501 for (i = 0; i < mem->am_size; i += AGP_PAGE_SIZE)
502 AGP_UNBIND_PAGE(dev, mem->am_offset + i);
503 for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
504 m = vm_page_lookup(mem->am_obj, atop(i));
505 vm_page_lock_queues();
506 vm_page_unwire(m, 0);
507 vm_page_unlock_queues();
508 }
509
510 agp_flush_cache();
511 AGP_FLUSH_TLB(dev);
512
513 mem->am_offset = 0;
514 mem->am_is_bound = 0;
515
516 lockmgr(&sc->as_lock, LK_RELEASE, 0, curthread);
517
518 return 0;
519 }
520
521 /* Helper functions for implementing user/kernel api */
522
523 static int
524 agp_acquire_helper(device_t dev, enum agp_acquire_state state)
525 {
526 struct agp_softc *sc = device_get_softc(dev);
527
528 if (sc->as_state != AGP_ACQUIRE_FREE)
529 return EBUSY;
530 sc->as_state = state;
531
532 return 0;
533 }
534
535 static int
536 agp_release_helper(device_t dev, enum agp_acquire_state state)
537 {
538 struct agp_softc *sc = device_get_softc(dev);
539
540 if (sc->as_state == AGP_ACQUIRE_FREE)
541 return 0;
542
543 if (sc->as_state != state)
544 return EBUSY;
545
546 sc->as_state = AGP_ACQUIRE_FREE;
547 return 0;
548 }
549
550 static struct agp_memory *
551 agp_find_memory(device_t dev, int id)
552 {
553 struct agp_softc *sc = device_get_softc(dev);
554 struct agp_memory *mem;
555
556 AGP_DPF("searching for memory block %d\n", id);
557 TAILQ_FOREACH(mem, &sc->as_memory, am_link) {
558 AGP_DPF("considering memory block %d\n", mem->am_id);
559 if (mem->am_id == id)
560 return mem;
561 }
562 return 0;
563 }
564
565 /* Implementation of the userland ioctl api */
566
567 static int
568 agp_info_user(device_t dev, agp_info *info)
569 {
570 struct agp_softc *sc = device_get_softc(dev);
571
572 bzero(info, sizeof *info);
573 info->bridge_id = pci_get_devid(dev);
574 info->agp_mode =
575 pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
576 info->aper_base = rman_get_start(sc->as_aperture);
577 info->aper_size = AGP_GET_APERTURE(dev) >> 20;
578 info->pg_total = info->pg_system = sc->as_maxmem >> AGP_PAGE_SHIFT;
579 info->pg_used = sc->as_allocated >> AGP_PAGE_SHIFT;
580
581 return 0;
582 }
583
584 static int
585 agp_setup_user(device_t dev, agp_setup *setup)
586 {
587 return AGP_ENABLE(dev, setup->agp_mode);
588 }
589
590 static int
591 agp_allocate_user(device_t dev, agp_allocate *alloc)
592 {
593 struct agp_memory *mem;
594
595 mem = AGP_ALLOC_MEMORY(dev,
596 alloc->type,
597 alloc->pg_count << AGP_PAGE_SHIFT);
598 if (mem) {
599 alloc->key = mem->am_id;
600 alloc->physical = mem->am_physical;
601 return 0;
602 } else {
603 return ENOMEM;
604 }
605 }
606
607 static int
608 agp_deallocate_user(device_t dev, int id)
609 {
610 struct agp_memory *mem = agp_find_memory(dev, id);;
611
612 if (mem) {
613 AGP_FREE_MEMORY(dev, mem);
614 return 0;
615 } else {
616 return ENOENT;
617 }
618 }
619
620 static int
621 agp_bind_user(device_t dev, agp_bind *bind)
622 {
623 struct agp_memory *mem = agp_find_memory(dev, bind->key);
624
625 if (!mem)
626 return ENOENT;
627
628 return AGP_BIND_MEMORY(dev, mem, bind->pg_start << AGP_PAGE_SHIFT);
629 }
630
631 static int
632 agp_unbind_user(device_t dev, agp_unbind *unbind)
633 {
634 struct agp_memory *mem = agp_find_memory(dev, unbind->key);
635
636 if (!mem)
637 return ENOENT;
638
639 return AGP_UNBIND_MEMORY(dev, mem);
640 }
641
642 static int
643 agp_open(dev_t kdev, int oflags, int devtype, struct thread *td)
644 {
645 device_t dev = KDEV2DEV(kdev);
646 struct agp_softc *sc = device_get_softc(dev);
647
648 if (!sc->as_isopen) {
649 sc->as_isopen = 1;
650 device_busy(dev);
651 }
652
653 return 0;
654 }
655
656 static int
657 agp_close(dev_t kdev, int fflag, int devtype, struct thread *td)
658 {
659 device_t dev = KDEV2DEV(kdev);
660 struct agp_softc *sc = device_get_softc(dev);
661 struct agp_memory *mem;
662
663 /*
664 * Clear the GATT and force release on last close
665 */
666 while ((mem = TAILQ_FIRST(&sc->as_memory)) != 0) {
667 if (mem->am_is_bound)
668 AGP_UNBIND_MEMORY(dev, mem);
669 AGP_FREE_MEMORY(dev, mem);
670 }
671 if (sc->as_state == AGP_ACQUIRE_USER)
672 agp_release_helper(dev, AGP_ACQUIRE_USER);
673 sc->as_isopen = 0;
674 device_unbusy(dev);
675
676 return 0;
677 }
678
679 static int
680 agp_ioctl(dev_t kdev, u_long cmd, caddr_t data, int fflag, struct thread *td)
681 {
682 device_t dev = KDEV2DEV(kdev);
683
684 switch (cmd) {
685 case AGPIOC_INFO:
686 return agp_info_user(dev, (agp_info *) data);
687
688 case AGPIOC_ACQUIRE:
689 return agp_acquire_helper(dev, AGP_ACQUIRE_USER);
690
691 case AGPIOC_RELEASE:
692 return agp_release_helper(dev, AGP_ACQUIRE_USER);
693
694 case AGPIOC_SETUP:
695 return agp_setup_user(dev, (agp_setup *)data);
696
697 case AGPIOC_ALLOCATE:
698 return agp_allocate_user(dev, (agp_allocate *)data);
699
700 case AGPIOC_DEALLOCATE:
701 return agp_deallocate_user(dev, *(int *) data);
702
703 case AGPIOC_BIND:
704 return agp_bind_user(dev, (agp_bind *)data);
705
706 case AGPIOC_UNBIND:
707 return agp_unbind_user(dev, (agp_unbind *)data);
708
709 }
710
711 return EINVAL;
712 }
713
714 static int
715 agp_mmap(dev_t kdev, vm_offset_t offset, int prot)
716 {
717 device_t dev = KDEV2DEV(kdev);
718 struct agp_softc *sc = device_get_softc(dev);
719
720 if (offset > AGP_GET_APERTURE(dev))
721 return -1;
722 return atop(rman_get_start(sc->as_aperture) + offset);
723 }
724
725 /* Implementation of the kernel api */
726
727 device_t
728 agp_find_device()
729 {
730 if (!agp_devclass)
731 return 0;
732 return devclass_get_device(agp_devclass, 0);
733 }
734
735 enum agp_acquire_state
736 agp_state(device_t dev)
737 {
738 struct agp_softc *sc = device_get_softc(dev);
739 return sc->as_state;
740 }
741
742 void
743 agp_get_info(device_t dev, struct agp_info *info)
744 {
745 struct agp_softc *sc = device_get_softc(dev);
746
747 info->ai_mode =
748 pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
749 info->ai_aperture_base = rman_get_start(sc->as_aperture);
750 info->ai_aperture_size = rman_get_size(sc->as_aperture);
751 info->ai_aperture_va = (vm_offset_t) rman_get_virtual(sc->as_aperture);
752 info->ai_memory_allowed = sc->as_maxmem;
753 info->ai_memory_used = sc->as_allocated;
754 }
755
756 int
757 agp_acquire(device_t dev)
758 {
759 return agp_acquire_helper(dev, AGP_ACQUIRE_KERNEL);
760 }
761
762 int
763 agp_release(device_t dev)
764 {
765 return agp_release_helper(dev, AGP_ACQUIRE_KERNEL);
766 }
767
768 int
769 agp_enable(device_t dev, u_int32_t mode)
770 {
771 return AGP_ENABLE(dev, mode);
772 }
773
774 void *agp_alloc_memory(device_t dev, int type, vm_size_t bytes)
775 {
776 return (void *) AGP_ALLOC_MEMORY(dev, type, bytes);
777 }
778
779 void agp_free_memory(device_t dev, void *handle)
780 {
781 struct agp_memory *mem = (struct agp_memory *) handle;
782 AGP_FREE_MEMORY(dev, mem);
783 }
784
785 int agp_bind_memory(device_t dev, void *handle, vm_offset_t offset)
786 {
787 struct agp_memory *mem = (struct agp_memory *) handle;
788 return AGP_BIND_MEMORY(dev, mem, offset);
789 }
790
791 int agp_unbind_memory(device_t dev, void *handle)
792 {
793 struct agp_memory *mem = (struct agp_memory *) handle;
794 return AGP_UNBIND_MEMORY(dev, mem);
795 }
796
797 void agp_memory_info(device_t dev, void *handle, struct
798 agp_memory_info *mi)
799 {
800 struct agp_memory *mem = (struct agp_memory *) handle;
801
802 mi->ami_size = mem->am_size;
803 mi->ami_physical = mem->am_physical;
804 mi->ami_offset = mem->am_offset;
805 mi->ami_is_bound = mem->am_is_bound;
806 }
Cache object: d138baa23e593774e8697ee09cef259e
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