1 /*- 2 * Copyright (c) 1988 University of Utah. 3 * Copyright (c) 1982, 1986, 1990 The Regents of the University of California. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * the Systems Programming Group of the University of Utah Computer 8 * Science Department, and code derived from software contributed to 9 * Berkeley by William Jolitz. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * from: Utah $Hdr: mem.c 1.13 89/10/08$ 36 * from: @(#)mem.c 7.2 (Berkeley) 5/9/91 37 * $FreeBSD: src/sys/i386/i386/mem.c,v 1.79.2.9 2003/01/04 22:58:01 njl Exp $ 38 */ 39 40 /* 41 * Memory special file 42 */ 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/buf.h> 47 #include <sys/conf.h> 48 #include <sys/fcntl.h> 49 #include <sys/filio.h> 50 #include <sys/interrupt.h> 51 #include <sys/kernel.h> 52 #include <sys/malloc.h> 53 #include <sys/memrange.h> 54 #include <sys/proc.h> 55 #include <sys/caps.h> 56 #include <sys/queue.h> 57 #include <sys/random.h> 58 #include <sys/signalvar.h> 59 #include <sys/uio.h> 60 #include <sys/vnode.h> 61 #include <sys/sysctl.h> 62 63 #include <sys/signal2.h> 64 #include <sys/spinlock2.h> 65 66 #include <vm/vm.h> 67 #include <vm/pmap.h> 68 #include <vm/vm_map.h> 69 #include <vm/vm_extern.h> 70 71 72 static d_open_t mmopen; 73 static d_close_t mmclose; 74 static d_read_t mmread; 75 static d_write_t mmwrite; 76 static d_ioctl_t mmioctl; 77 #if 0 78 static d_mmap_t memmmap; 79 #endif 80 static d_kqfilter_t mmkqfilter; 81 static int memuksmap(vm_map_backing_t ba, int op, cdev_t dev, vm_page_t fake); 82 83 #define CDEV_MAJOR 2 84 static struct dev_ops mem_ops = { 85 { "mem", 0, D_MPSAFE | D_QUICK }, 86 .d_open = mmopen, 87 .d_close = mmclose, 88 .d_read = mmread, 89 .d_write = mmwrite, 90 .d_ioctl = mmioctl, 91 .d_kqfilter = mmkqfilter, 92 #if 0 93 .d_mmap = memmmap, 94 #endif 95 .d_uksmap = memuksmap 96 }; 97 98 static struct dev_ops mem_ops_mem = { 99 { "mem", 0, D_MEM | D_MPSAFE | D_QUICK }, 100 .d_open = mmopen, 101 .d_close = mmclose, 102 .d_read = mmread, 103 .d_write = mmwrite, 104 .d_ioctl = mmioctl, 105 .d_kqfilter = mmkqfilter, 106 #if 0 107 .d_mmap = memmmap, 108 #endif 109 .d_uksmap = memuksmap 110 }; 111 112 static struct dev_ops mem_ops_noq = { 113 { "mem", 0, D_MPSAFE }, 114 .d_open = mmopen, 115 .d_close = mmclose, 116 .d_read = mmread, 117 .d_write = mmwrite, 118 .d_ioctl = mmioctl, 119 .d_kqfilter = mmkqfilter, 120 #if 0 121 .d_mmap = memmmap, 122 #endif 123 .d_uksmap = memuksmap 124 }; 125 126 static int rand_bolt; 127 static caddr_t zbuf; 128 static cdev_t zerodev = NULL; 129 static struct lock mem_lock = LOCK_INITIALIZER("memlk", 0, 0); 130 131 MALLOC_DEFINE(M_MEMDESC, "memdesc", "memory range descriptors"); 132 static int mem_ioctl (cdev_t, u_long, caddr_t, int, struct ucred *); 133 static int random_ioctl (cdev_t, u_long, caddr_t, int, struct ucred *); 134 135 struct mem_range_softc mem_range_softc; 136 137 static int seedenable; 138 SYSCTL_INT(_kern, OID_AUTO, seedenable, CTLFLAG_RW, &seedenable, 0, ""); 139 140 static int 141 mmopen(struct dev_open_args *ap) 142 { 143 cdev_t dev = ap->a_head.a_dev; 144 int error; 145 146 switch (minor(dev)) { 147 case 0: 148 case 1: 149 /* 150 * /dev/mem and /dev/kmem 151 */ 152 if (ap->a_oflags & FWRITE) { 153 if (securelevel > 0 || kernel_mem_readonly) 154 return (EPERM); 155 } 156 error = 0; 157 break; 158 case 6: 159 /* 160 * /dev/kpmap can only be opened for reading. 161 */ 162 if (ap->a_oflags & FWRITE) 163 return (EPERM); 164 error = 0; 165 break; 166 case 14: 167 error = caps_priv_check(ap->a_cred, SYSCAP_RESTRICTEDROOT); 168 if (error != 0) 169 break; 170 if (securelevel > 0 || kernel_mem_readonly) { 171 error = EPERM; 172 break; 173 } 174 error = cpu_set_iopl(); 175 break; 176 default: 177 error = 0; 178 break; 179 } 180 return (error); 181 } 182 183 static int 184 mmclose(struct dev_close_args *ap) 185 { 186 cdev_t dev = ap->a_head.a_dev; 187 int error; 188 189 switch (minor(dev)) { 190 case 14: 191 error = cpu_clr_iopl(); 192 break; 193 default: 194 error = 0; 195 break; 196 } 197 return (error); 198 } 199 200 201 static int 202 mmrw(cdev_t dev, struct uio *uio, int flags) 203 { 204 int o; 205 u_int c; 206 u_int poolsize; 207 u_long v; 208 struct iovec *iov; 209 int error = 0; 210 caddr_t buf = NULL; 211 212 while (uio->uio_resid > 0 && error == 0) { 213 iov = uio->uio_iov; 214 if (iov->iov_len == 0) { 215 uio->uio_iov++; 216 uio->uio_iovcnt--; 217 if (uio->uio_iovcnt < 0) 218 panic("mmrw"); 219 continue; 220 } 221 switch (minor(dev)) { 222 case 0: 223 /* 224 * minor device 0 is physical memory, /dev/mem 225 */ 226 v = uio->uio_offset; 227 v &= ~(long)PAGE_MASK; 228 pmap_kenter((vm_offset_t)ptvmmap, v); 229 o = (int)uio->uio_offset & PAGE_MASK; 230 c = (u_int)(PAGE_SIZE - ((uintptr_t)iov->iov_base & PAGE_MASK)); 231 c = min(c, (u_int)(PAGE_SIZE - o)); 232 c = min(c, (u_int)iov->iov_len); 233 error = uiomove((caddr_t)&ptvmmap[o], (int)c, uio); 234 pmap_kremove((vm_offset_t)ptvmmap); 235 continue; 236 237 case 1: { 238 /* 239 * minor device 1 is kernel memory, /dev/kmem 240 */ 241 vm_offset_t saddr, eaddr; 242 int prot; 243 244 c = iov->iov_len; 245 246 /* 247 * Make sure that all of the pages are currently 248 * resident so that we don't create any zero-fill 249 * pages. 250 */ 251 saddr = trunc_page(uio->uio_offset); 252 eaddr = round_page(uio->uio_offset + c); 253 if (saddr > eaddr) 254 return EFAULT; 255 256 /* 257 * Make sure the kernel addresses are mapped. 258 * platform_direct_mapped() can be used to bypass 259 * default mapping via the page table (virtual kernels 260 * contain a lot of out-of-band data). 261 */ 262 prot = VM_PROT_READ; 263 if (uio->uio_rw != UIO_READ) 264 prot |= VM_PROT_WRITE; 265 error = kvm_access_check(saddr, eaddr, prot); 266 if (error) 267 return (error); 268 error = uiomove((caddr_t)(vm_offset_t)uio->uio_offset, 269 (int)c, uio); 270 continue; 271 } 272 case 2: 273 /* 274 * minor device 2 (/dev/null) is EOF/RATHOLE 275 */ 276 if (uio->uio_rw == UIO_READ) 277 return (0); 278 c = iov->iov_len; 279 break; 280 case 3: 281 /* 282 * minor device 3 (/dev/random) is source of filth 283 * on read, seeder on write 284 */ 285 if (buf == NULL) 286 buf = kmalloc(PAGE_SIZE, M_TEMP, M_WAITOK); 287 c = min(iov->iov_len, PAGE_SIZE); 288 if (uio->uio_rw == UIO_WRITE) { 289 error = uiomove(buf, (int)c, uio); 290 if (error == 0 && 291 seedenable && 292 securelevel <= 0) { 293 error = add_buffer_randomness_src(buf, c, RAND_SRC_SEEDING); 294 } else if (error == 0) { 295 error = EPERM; 296 } 297 } else { 298 poolsize = read_random(buf, c, 0); 299 if (poolsize == 0) { 300 if (buf) 301 kfree(buf, M_TEMP); 302 if ((flags & IO_NDELAY) != 0) 303 return (EWOULDBLOCK); 304 return (0); 305 } 306 c = min(c, poolsize); 307 error = uiomove(buf, (int)c, uio); 308 } 309 continue; 310 case 4: 311 /* 312 * minor device 4 (/dev/urandom) is source of muck 313 * on read, writes are disallowed. 314 */ 315 c = min(iov->iov_len, PAGE_SIZE); 316 if (uio->uio_rw == UIO_WRITE) { 317 error = EPERM; 318 break; 319 } 320 if (CURSIG(curthread->td_lwp) != 0) { 321 /* 322 * Use tsleep() to get the error code right. 323 * It should return immediately. 324 */ 325 error = tsleep(&rand_bolt, PCATCH, "urand", 1); 326 if (error != 0 && error != EWOULDBLOCK) 327 continue; 328 } 329 if (buf == NULL) 330 buf = kmalloc(PAGE_SIZE, M_TEMP, M_WAITOK); 331 poolsize = read_random(buf, c, 1); 332 c = min(c, poolsize); 333 error = uiomove(buf, (int)c, uio); 334 continue; 335 /* case 5: read/write not supported, mmap only */ 336 /* case 6: read/write not supported, mmap only */ 337 case 12: 338 /* 339 * minor device 12 (/dev/zero) is source of nulls 340 * on read, write are disallowed. 341 */ 342 if (uio->uio_rw == UIO_WRITE) { 343 c = iov->iov_len; 344 break; 345 } 346 if (zbuf == NULL) { 347 zbuf = (caddr_t)kmalloc(PAGE_SIZE, M_TEMP, 348 M_WAITOK | M_ZERO); 349 } 350 c = min(iov->iov_len, PAGE_SIZE); 351 error = uiomove(zbuf, (int)c, uio); 352 continue; 353 default: 354 return (ENODEV); 355 } 356 if (error) 357 break; 358 iov->iov_base = (char *)iov->iov_base + c; 359 iov->iov_len -= c; 360 uio->uio_offset += c; 361 uio->uio_resid -= c; 362 } 363 if (buf) 364 kfree(buf, M_TEMP); 365 return (error); 366 } 367 368 static int 369 mmread(struct dev_read_args *ap) 370 { 371 return(mmrw(ap->a_head.a_dev, ap->a_uio, ap->a_ioflag)); 372 } 373 374 static int 375 mmwrite(struct dev_write_args *ap) 376 { 377 return(mmrw(ap->a_head.a_dev, ap->a_uio, ap->a_ioflag)); 378 } 379 380 /*******************************************************\ 381 * allow user processes to MMAP some memory sections * 382 * instead of going through read/write * 383 \*******************************************************/ 384 385 static int user_kernel_mapping(vm_map_backing_t ba, int num, 386 vm_ooffset_t offset, vm_ooffset_t *resultp); 387 388 static int 389 memuksmap(vm_map_backing_t ba, int op, cdev_t dev, vm_page_t fake) 390 { 391 vm_ooffset_t result; 392 int error; 393 struct lwp *lp; 394 395 error = 0; 396 397 switch(op) { 398 case UKSMAPOP_ADD: 399 /* 400 * We only need to track mappings for /dev/lpmap, all process 401 * mappings will be deleted when the process exits and we 402 * do not need to track kernel mappings. 403 */ 404 if (minor(dev) == 7) { 405 lp = ba->aux_info; 406 spin_lock(&lp->lwp_spin); 407 TAILQ_INSERT_TAIL(&lp->lwp_lpmap_backing_list, 408 ba, entry); 409 spin_unlock(&lp->lwp_spin); 410 } 411 break; 412 case UKSMAPOP_REM: 413 /* 414 * We only need to track mappings for /dev/lpmap, all process 415 * mappings will be deleted when the process exits and we 416 * do not need to track kernel mappings. 417 */ 418 if (minor(dev) == 7) { 419 lp = ba->aux_info; 420 spin_lock(&lp->lwp_spin); 421 TAILQ_REMOVE(&lp->lwp_lpmap_backing_list, ba, entry); 422 spin_unlock(&lp->lwp_spin); 423 } 424 break; 425 case UKSMAPOP_FAULT: 426 switch (minor(dev)) { 427 case 0: 428 /* 429 * minor device 0 is physical memory 430 */ 431 fake->phys_addr = ptoa(fake->pindex); 432 break; 433 case 1: 434 /* 435 * minor device 1 is kernel memory 436 */ 437 fake->phys_addr = vtophys(ptoa(fake->pindex)); 438 break; 439 case 5: 440 case 6: 441 case 7: 442 /* 443 * minor device 5 is /dev/upmap (see sys/upmap.h) 444 * minor device 6 is /dev/kpmap (see sys/upmap.h) 445 * minor device 7 is /dev/lpmap (see sys/upmap.h) 446 */ 447 result = 0; 448 error = user_kernel_mapping(ba, 449 minor(dev), 450 ptoa(fake->pindex), 451 &result); 452 fake->phys_addr = result; 453 break; 454 default: 455 error = EINVAL; 456 break; 457 } 458 break; 459 default: 460 error = EINVAL; 461 break; 462 } 463 return error; 464 } 465 466 static int 467 mmioctl(struct dev_ioctl_args *ap) 468 { 469 cdev_t dev = ap->a_head.a_dev; 470 int error; 471 472 lockmgr(&mem_lock, LK_EXCLUSIVE); 473 474 switch (minor(dev)) { 475 case 0: 476 error = mem_ioctl(dev, ap->a_cmd, ap->a_data, 477 ap->a_fflag, ap->a_cred); 478 break; 479 case 3: 480 case 4: 481 error = random_ioctl(dev, ap->a_cmd, ap->a_data, 482 ap->a_fflag, ap->a_cred); 483 break; 484 default: 485 error = ENODEV; 486 break; 487 } 488 489 lockmgr(&mem_lock, LK_RELEASE); 490 491 return (error); 492 } 493 494 /* 495 * Operations for changing memory attributes. 496 * 497 * This is basically just an ioctl shim for mem_range_attr_get 498 * and mem_range_attr_set. 499 */ 500 static int 501 mem_ioctl(cdev_t dev, u_long cmd, caddr_t data, int flags, struct ucred *cred) 502 { 503 int nd, error = 0; 504 struct mem_range_op *mo = (struct mem_range_op *)data; 505 struct mem_range_desc *md; 506 507 /* is this for us? */ 508 if ((cmd != MEMRANGE_GET) && 509 (cmd != MEMRANGE_SET)) 510 return (ENOTTY); 511 512 /* any chance we can handle this? */ 513 if (mem_range_softc.mr_op == NULL) 514 return (EOPNOTSUPP); 515 516 /* do we have any descriptors? */ 517 if (mem_range_softc.mr_ndesc == 0) 518 return (ENXIO); 519 520 switch (cmd) { 521 case MEMRANGE_GET: 522 nd = imin(mo->mo_arg[0], mem_range_softc.mr_ndesc); 523 if (nd > 0) { 524 md = (struct mem_range_desc *) 525 kmalloc(nd * sizeof(struct mem_range_desc), 526 M_MEMDESC, M_WAITOK); 527 error = mem_range_attr_get(md, &nd); 528 if (!error) 529 error = copyout(md, mo->mo_desc, 530 nd * sizeof(struct mem_range_desc)); 531 kfree(md, M_MEMDESC); 532 } else { 533 nd = mem_range_softc.mr_ndesc; 534 } 535 mo->mo_arg[0] = nd; 536 break; 537 538 case MEMRANGE_SET: 539 md = (struct mem_range_desc *)kmalloc(sizeof(struct mem_range_desc), 540 M_MEMDESC, M_WAITOK); 541 error = copyin(mo->mo_desc, md, sizeof(struct mem_range_desc)); 542 /* clamp description string */ 543 md->mr_owner[sizeof(md->mr_owner) - 1] = 0; 544 if (error == 0) 545 error = mem_range_attr_set(md, &mo->mo_arg[0]); 546 kfree(md, M_MEMDESC); 547 break; 548 } 549 return (error); 550 } 551 552 /* 553 * Implementation-neutral, kernel-callable functions for manipulating 554 * memory range attributes. 555 */ 556 int 557 mem_range_attr_get(struct mem_range_desc *mrd, int *arg) 558 { 559 /* can we handle this? */ 560 if (mem_range_softc.mr_op == NULL) 561 return (EOPNOTSUPP); 562 563 if (*arg == 0) { 564 *arg = mem_range_softc.mr_ndesc; 565 } else { 566 bcopy(mem_range_softc.mr_desc, mrd, (*arg) * sizeof(struct mem_range_desc)); 567 } 568 return (0); 569 } 570 571 int 572 mem_range_attr_set(struct mem_range_desc *mrd, int *arg) 573 { 574 /* can we handle this? */ 575 if (mem_range_softc.mr_op == NULL) 576 return (EOPNOTSUPP); 577 578 return (mem_range_softc.mr_op->set(&mem_range_softc, mrd, arg)); 579 } 580 581 void 582 mem_range_AP_init(void) 583 { 584 if (mem_range_softc.mr_op && mem_range_softc.mr_op->initAP) 585 mem_range_softc.mr_op->initAP(&mem_range_softc); 586 } 587 588 static int 589 random_ioctl(cdev_t dev, u_long cmd, caddr_t data, int flags, struct ucred *cred) 590 { 591 int error; 592 int intr; 593 594 /* 595 * Even inspecting the state is privileged, since it gives a hint 596 * about how easily the randomness might be guessed. 597 */ 598 error = 0; 599 600 switch (cmd) { 601 /* Really handled in upper layer */ 602 case FIOASYNC: 603 break; 604 case MEM_SETIRQ: 605 intr = *(int16_t *)data; 606 if ((error = caps_priv_check(cred, SYSCAP_RESTRICTEDROOT)) != 0) 607 break; 608 if (intr < 0 || intr >= MAX_INTS) 609 return (EINVAL); 610 register_randintr(intr); 611 break; 612 case MEM_CLEARIRQ: 613 intr = *(int16_t *)data; 614 if ((error = caps_priv_check(cred, SYSCAP_RESTRICTEDROOT)) != 0) 615 break; 616 if (intr < 0 || intr >= MAX_INTS) 617 return (EINVAL); 618 unregister_randintr(intr); 619 break; 620 case MEM_RETURNIRQ: 621 error = ENOTSUP; 622 break; 623 case MEM_FINDIRQ: 624 intr = *(int16_t *)data; 625 if ((error = caps_priv_check(cred, SYSCAP_RESTRICTEDROOT)) != 0) 626 break; 627 if (intr < 0 || intr >= MAX_INTS) 628 return (EINVAL); 629 intr = next_registered_randintr(intr); 630 if (intr == MAX_INTS) 631 return (ENOENT); 632 *(u_int16_t *)data = intr; 633 break; 634 default: 635 error = ENOTSUP; 636 break; 637 } 638 return (error); 639 } 640 641 static int 642 mm_filter_read(struct knote *kn, long hint) 643 { 644 return (1); 645 } 646 647 static int 648 mm_filter_write(struct knote *kn, long hint) 649 { 650 return (1); 651 } 652 653 static void 654 dummy_filter_detach(struct knote *kn) {} 655 656 /* Implemented in kern_nrandom.c */ 657 static struct filterops random_read_filtops = 658 { FILTEROP_ISFD|FILTEROP_MPSAFE, NULL, dummy_filter_detach, random_filter_read }; 659 660 static struct filterops mm_read_filtops = 661 { FILTEROP_ISFD|FILTEROP_MPSAFE, NULL, dummy_filter_detach, mm_filter_read }; 662 663 static struct filterops mm_write_filtops = 664 { FILTEROP_ISFD|FILTEROP_MPSAFE, NULL, dummy_filter_detach, mm_filter_write }; 665 666 static int 667 mmkqfilter(struct dev_kqfilter_args *ap) 668 { 669 struct knote *kn = ap->a_kn; 670 cdev_t dev = ap->a_head.a_dev; 671 672 ap->a_result = 0; 673 switch (kn->kn_filter) { 674 case EVFILT_READ: 675 switch (minor(dev)) { 676 case 3: 677 kn->kn_fop = &random_read_filtops; 678 break; 679 default: 680 kn->kn_fop = &mm_read_filtops; 681 break; 682 } 683 break; 684 case EVFILT_WRITE: 685 kn->kn_fop = &mm_write_filtops; 686 break; 687 default: 688 ap->a_result = EOPNOTSUPP; 689 return (0); 690 } 691 692 return (0); 693 } 694 695 int 696 iszerodev(cdev_t dev) 697 { 698 return (zerodev == dev); 699 } 700 701 /* 702 * /dev/lpmap, /dev/upmap, /dev/kpmap. 703 */ 704 static int 705 user_kernel_mapping(vm_map_backing_t ba, int num, vm_ooffset_t offset, 706 vm_ooffset_t *resultp) 707 { 708 struct proc *p; 709 struct lwp *lp; 710 int error; 711 int invfork; 712 713 if (offset < 0) 714 return (EINVAL); 715 716 error = EINVAL; 717 718 switch(num) { 719 case 5: 720 /* 721 * /dev/upmap - maps RW per-process shared user-kernel area. 722 */ 723 724 /* 725 * If this is a child currently in vfork the pmap is shared 726 * with the parent! We need to actually set-up the parent's 727 * p_upmap, not the child's, and we need to set the invfork 728 * flag. Userland will probably adjust its static state so 729 * it must be consistent with the parent or userland will be 730 * really badly confused. 731 * 732 * (this situation can happen when user code in vfork() calls 733 * libc's getpid() or some other function which then decides 734 * it wants the upmap). 735 */ 736 p = ba->aux_info; 737 if (p == NULL) 738 break; 739 if (p->p_flags & P_PPWAIT) { 740 p = p->p_pptr; 741 if (p == NULL) 742 return (EINVAL); 743 invfork = 1; 744 } else { 745 invfork = 0; 746 } 747 748 /* 749 * Create the kernel structure as required, set the invfork 750 * flag if we are faulting in on a vfork(). 751 */ 752 if (p->p_upmap == NULL) 753 proc_usermap(p, invfork); 754 if (p->p_upmap && invfork) 755 p->p_upmap->invfork = invfork; 756 757 /* 758 * Extract address for pmap 759 */ 760 if (p->p_upmap && 761 offset < roundup2(sizeof(*p->p_upmap), PAGE_SIZE)) { 762 /* only good for current process */ 763 *resultp = pmap_kextract((vm_offset_t)p->p_upmap + 764 offset); 765 error = 0; 766 } 767 break; 768 case 6: 769 /* 770 * /dev/kpmap - maps RO shared kernel global page 771 * 772 * Extract address for pmap 773 */ 774 if (kpmap && 775 offset < roundup2(sizeof(*kpmap), PAGE_SIZE)) { 776 *resultp = pmap_kextract((vm_offset_t)kpmap + offset); 777 error = 0; 778 } 779 break; 780 case 7: 781 /* 782 * /dev/lpmap - maps RW per-thread shared user-kernel area. 783 */ 784 lp = ba->aux_info; 785 if (lp == NULL) 786 break; 787 788 /* 789 * Create the kernel structure as required 790 */ 791 if (lp->lwp_lpmap == NULL) 792 lwp_usermap(lp, -1); /* second arg not yet XXX */ 793 794 /* 795 * Extract address for pmap 796 */ 797 if (lp->lwp_lpmap && 798 offset < roundup2(sizeof(*lp->lwp_lpmap), PAGE_SIZE)) { 799 /* only good for current process */ 800 *resultp = pmap_kextract((vm_offset_t)lp->lwp_lpmap + 801 offset); 802 error = 0; 803 } 804 break; 805 default: 806 break; 807 } 808 return error; 809 } 810 811 static void 812 mem_drvinit(void *unused) 813 { 814 815 /* Initialise memory range handling */ 816 if (mem_range_softc.mr_op != NULL) 817 mem_range_softc.mr_op->init(&mem_range_softc); 818 819 make_dev(&mem_ops_mem, 0, UID_ROOT, GID_KMEM, 0640, "mem"); 820 make_dev(&mem_ops_mem, 1, UID_ROOT, GID_KMEM, 0640, "kmem"); 821 make_dev(&mem_ops, 2, UID_ROOT, GID_WHEEL, 0666, "null"); 822 make_dev(&mem_ops, 3, UID_ROOT, GID_WHEEL, 0644, "random"); 823 make_dev(&mem_ops, 4, UID_ROOT, GID_WHEEL, 0644, "urandom"); 824 make_dev(&mem_ops, 5, UID_ROOT, GID_WHEEL, 0666, "upmap"); 825 make_dev(&mem_ops, 6, UID_ROOT, GID_WHEEL, 0444, "kpmap"); 826 make_dev(&mem_ops, 7, UID_ROOT, GID_WHEEL, 0666, "lpmap"); 827 zerodev = make_dev(&mem_ops, 12, UID_ROOT, GID_WHEEL, 0666, "zero"); 828 make_dev(&mem_ops_noq, 14, UID_ROOT, GID_WHEEL, 0600, "io"); 829 } 830 831 SYSINIT(memdev, SI_SUB_DRIVERS, SI_ORDER_MIDDLE + CDEV_MAJOR, mem_drvinit, 832 NULL); 833 834