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/kernel.h> 51 #include <sys/malloc.h> 52 #include <sys/memrange.h> 53 #include <sys/proc.h> 54 #include <sys/priv.h> 55 #include <sys/random.h> 56 #include <sys/signalvar.h> 57 #include <sys/uio.h> 58 #include <sys/vnode.h> 59 #include <sys/sysctl.h> 60 61 #include <sys/signal2.h> 62 63 #include <vm/vm.h> 64 #include <vm/pmap.h> 65 #include <vm/vm_extern.h> 66 67 68 static d_open_t mmopen; 69 static d_close_t mmclose; 70 static d_read_t mmread; 71 static d_write_t mmwrite; 72 static d_ioctl_t mmioctl; 73 #if 0 74 static d_mmap_t memmmap; 75 #endif 76 static d_kqfilter_t mmkqfilter; 77 static int memuksmap(cdev_t dev, vm_page_t fake); 78 79 #define CDEV_MAJOR 2 80 static struct dev_ops mem_ops = { 81 { "mem", 0, D_MPSAFE | D_QUICK }, 82 .d_open = mmopen, 83 .d_close = mmclose, 84 .d_read = mmread, 85 .d_write = mmwrite, 86 .d_ioctl = mmioctl, 87 .d_kqfilter = mmkqfilter, 88 #if 0 89 .d_mmap = memmmap, 90 #endif 91 .d_uksmap = memuksmap 92 }; 93 94 static struct dev_ops mem_ops_noq = { 95 { "mem", 0, D_MPSAFE }, 96 .d_open = mmopen, 97 .d_close = mmclose, 98 .d_read = mmread, 99 .d_write = mmwrite, 100 .d_ioctl = mmioctl, 101 .d_kqfilter = mmkqfilter, 102 #if 0 103 .d_mmap = memmmap, 104 #endif 105 .d_uksmap = memuksmap 106 }; 107 108 static int rand_bolt; 109 static caddr_t zbuf; 110 static cdev_t zerodev = NULL; 111 static struct lock mem_lock = LOCK_INITIALIZER("memlk", 0, 0); 112 113 MALLOC_DEFINE(M_MEMDESC, "memdesc", "memory range descriptors"); 114 static int mem_ioctl (cdev_t, u_long, caddr_t, int, struct ucred *); 115 static int random_ioctl (cdev_t, u_long, caddr_t, int, struct ucred *); 116 117 struct mem_range_softc mem_range_softc; 118 119 static int seedenable; 120 SYSCTL_INT(_kern, OID_AUTO, seedenable, CTLFLAG_RW, &seedenable, 0, ""); 121 122 static int 123 mmopen(struct dev_open_args *ap) 124 { 125 cdev_t dev = ap->a_head.a_dev; 126 int error; 127 128 switch (minor(dev)) { 129 case 0: 130 case 1: 131 /* 132 * /dev/mem and /dev/kmem 133 */ 134 if (ap->a_oflags & FWRITE) { 135 if (securelevel > 0 || kernel_mem_readonly) 136 return (EPERM); 137 } 138 error = 0; 139 break; 140 case 6: 141 /* 142 * /dev/kpmap can only be opened for reading. 143 */ 144 if (ap->a_oflags & FWRITE) 145 return (EPERM); 146 error = 0; 147 break; 148 case 14: 149 error = priv_check_cred(ap->a_cred, PRIV_ROOT, 0); 150 if (error != 0) 151 break; 152 if (securelevel > 0 || kernel_mem_readonly) { 153 error = EPERM; 154 break; 155 } 156 error = cpu_set_iopl(); 157 break; 158 default: 159 error = 0; 160 break; 161 } 162 return (error); 163 } 164 165 static int 166 mmclose(struct dev_close_args *ap) 167 { 168 cdev_t dev = ap->a_head.a_dev; 169 int error; 170 171 switch (minor(dev)) { 172 case 14: 173 error = cpu_clr_iopl(); 174 break; 175 default: 176 error = 0; 177 break; 178 } 179 return (error); 180 } 181 182 183 static int 184 mmrw(cdev_t dev, struct uio *uio, int flags) 185 { 186 int o; 187 u_int c; 188 u_int poolsize; 189 u_long v; 190 struct iovec *iov; 191 int error = 0; 192 caddr_t buf = NULL; 193 194 while (uio->uio_resid > 0 && error == 0) { 195 iov = uio->uio_iov; 196 if (iov->iov_len == 0) { 197 uio->uio_iov++; 198 uio->uio_iovcnt--; 199 if (uio->uio_iovcnt < 0) 200 panic("mmrw"); 201 continue; 202 } 203 switch (minor(dev)) { 204 case 0: 205 /* 206 * minor device 0 is physical memory, /dev/mem 207 */ 208 v = uio->uio_offset; 209 v &= ~(long)PAGE_MASK; 210 pmap_kenter((vm_offset_t)ptvmmap, v); 211 o = (int)uio->uio_offset & PAGE_MASK; 212 c = (u_int)(PAGE_SIZE - ((uintptr_t)iov->iov_base & PAGE_MASK)); 213 c = min(c, (u_int)(PAGE_SIZE - o)); 214 c = min(c, (u_int)iov->iov_len); 215 error = uiomove((caddr_t)&ptvmmap[o], (int)c, uio); 216 pmap_kremove((vm_offset_t)ptvmmap); 217 continue; 218 219 case 1: { 220 /* 221 * minor device 1 is kernel memory, /dev/kmem 222 */ 223 vm_offset_t saddr, eaddr; 224 int prot; 225 226 c = iov->iov_len; 227 228 /* 229 * Make sure that all of the pages are currently 230 * resident so that we don't create any zero-fill 231 * pages. 232 */ 233 saddr = trunc_page(uio->uio_offset); 234 eaddr = round_page(uio->uio_offset + c); 235 if (saddr > eaddr) 236 return EFAULT; 237 238 /* 239 * Make sure the kernel addresses are mapped. 240 * platform_direct_mapped() can be used to bypass 241 * default mapping via the page table (virtual kernels 242 * contain a lot of out-of-band data). 243 */ 244 prot = VM_PROT_READ; 245 if (uio->uio_rw != UIO_READ) 246 prot |= VM_PROT_WRITE; 247 error = kvm_access_check(saddr, eaddr, prot); 248 if (error) 249 return (error); 250 error = uiomove((caddr_t)(vm_offset_t)uio->uio_offset, 251 (int)c, uio); 252 continue; 253 } 254 case 2: 255 /* 256 * minor device 2 (/dev/null) is EOF/RATHOLE 257 */ 258 if (uio->uio_rw == UIO_READ) 259 return (0); 260 c = iov->iov_len; 261 break; 262 case 3: 263 /* 264 * minor device 3 (/dev/random) is source of filth 265 * on read, seeder on write 266 */ 267 if (buf == NULL) 268 buf = kmalloc(PAGE_SIZE, M_TEMP, M_WAITOK); 269 c = min(iov->iov_len, PAGE_SIZE); 270 if (uio->uio_rw == UIO_WRITE) { 271 error = uiomove(buf, (int)c, uio); 272 if (error == 0 && 273 seedenable && 274 securelevel <= 0) { 275 error = add_buffer_randomness_src(buf, c, RAND_SRC_SEEDING); 276 } else if (error == 0) { 277 error = EPERM; 278 } 279 } else { 280 poolsize = read_random(buf, c); 281 if (poolsize == 0) { 282 if (buf) 283 kfree(buf, M_TEMP); 284 if ((flags & IO_NDELAY) != 0) 285 return (EWOULDBLOCK); 286 return (0); 287 } 288 c = min(c, poolsize); 289 error = uiomove(buf, (int)c, uio); 290 } 291 continue; 292 case 4: 293 /* 294 * minor device 4 (/dev/urandom) is source of muck 295 * on read, writes are disallowed. 296 */ 297 c = min(iov->iov_len, PAGE_SIZE); 298 if (uio->uio_rw == UIO_WRITE) { 299 error = EPERM; 300 break; 301 } 302 if (CURSIG(curthread->td_lwp) != 0) { 303 /* 304 * Use tsleep() to get the error code right. 305 * It should return immediately. 306 */ 307 error = tsleep(&rand_bolt, PCATCH, "urand", 1); 308 if (error != 0 && error != EWOULDBLOCK) 309 continue; 310 } 311 if (buf == NULL) 312 buf = kmalloc(PAGE_SIZE, M_TEMP, M_WAITOK); 313 poolsize = read_random_unlimited(buf, c); 314 c = min(c, poolsize); 315 error = uiomove(buf, (int)c, uio); 316 continue; 317 /* case 5: read/write not supported, mmap only */ 318 /* case 6: read/write not supported, mmap only */ 319 case 12: 320 /* 321 * minor device 12 (/dev/zero) is source of nulls 322 * on read, write are disallowed. 323 */ 324 if (uio->uio_rw == UIO_WRITE) { 325 c = iov->iov_len; 326 break; 327 } 328 if (zbuf == NULL) { 329 zbuf = (caddr_t)kmalloc(PAGE_SIZE, M_TEMP, 330 M_WAITOK | M_ZERO); 331 } 332 c = min(iov->iov_len, PAGE_SIZE); 333 error = uiomove(zbuf, (int)c, uio); 334 continue; 335 default: 336 return (ENODEV); 337 } 338 if (error) 339 break; 340 iov->iov_base = (char *)iov->iov_base + c; 341 iov->iov_len -= c; 342 uio->uio_offset += c; 343 uio->uio_resid -= c; 344 } 345 if (buf) 346 kfree(buf, M_TEMP); 347 return (error); 348 } 349 350 static int 351 mmread(struct dev_read_args *ap) 352 { 353 return(mmrw(ap->a_head.a_dev, ap->a_uio, ap->a_ioflag)); 354 } 355 356 static int 357 mmwrite(struct dev_write_args *ap) 358 { 359 return(mmrw(ap->a_head.a_dev, ap->a_uio, ap->a_ioflag)); 360 } 361 362 /*******************************************************\ 363 * allow user processes to MMAP some memory sections * 364 * instead of going through read/write * 365 \*******************************************************/ 366 367 static int user_kernel_mapping(int num, vm_ooffset_t offset, 368 vm_ooffset_t *resultp); 369 370 #if 0 371 372 static int 373 memmmap(struct dev_mmap_args *ap) 374 { 375 cdev_t dev = ap->a_head.a_dev; 376 vm_ooffset_t result; 377 int error; 378 379 switch (minor(dev)) { 380 case 0: 381 /* 382 * minor device 0 is physical memory 383 */ 384 ap->a_result = atop(ap->a_offset); 385 error = 0; 386 break; 387 case 1: 388 /* 389 * minor device 1 is kernel memory 390 */ 391 ap->a_result = atop(vtophys(ap->a_offset)); 392 error = 0; 393 break; 394 case 5: 395 case 6: 396 /* 397 * minor device 5 is /dev/upmap (see sys/upmap.h) 398 * minor device 6 is /dev/kpmap (see sys/upmap.h) 399 */ 400 result = 0; 401 error = user_kernel_mapping(minor(dev), ap->a_offset, &result); 402 ap->a_result = atop(result); 403 break; 404 default: 405 error = EINVAL; 406 break; 407 } 408 return error; 409 } 410 411 #endif 412 413 static int 414 memuksmap(cdev_t dev, vm_page_t fake) 415 { 416 vm_ooffset_t result; 417 int error; 418 419 switch (minor(dev)) { 420 case 0: 421 /* 422 * minor device 0 is physical memory 423 */ 424 fake->phys_addr = ptoa(fake->pindex); 425 error = 0; 426 break; 427 case 1: 428 /* 429 * minor device 1 is kernel memory 430 */ 431 fake->phys_addr = vtophys(ptoa(fake->pindex)); 432 error = 0; 433 break; 434 case 5: 435 case 6: 436 /* 437 * minor device 5 is /dev/upmap (see sys/upmap.h) 438 * minor device 6 is /dev/kpmap (see sys/upmap.h) 439 */ 440 result = 0; 441 error = user_kernel_mapping(minor(dev), 442 ptoa(fake->pindex), &result); 443 fake->phys_addr = result; 444 break; 445 default: 446 error = EINVAL; 447 break; 448 } 449 return error; 450 } 451 452 static int 453 mmioctl(struct dev_ioctl_args *ap) 454 { 455 cdev_t dev = ap->a_head.a_dev; 456 int error; 457 458 lockmgr(&mem_lock, LK_EXCLUSIVE); 459 460 switch (minor(dev)) { 461 case 0: 462 error = mem_ioctl(dev, ap->a_cmd, ap->a_data, 463 ap->a_fflag, ap->a_cred); 464 break; 465 case 3: 466 case 4: 467 error = random_ioctl(dev, ap->a_cmd, ap->a_data, 468 ap->a_fflag, ap->a_cred); 469 break; 470 default: 471 error = ENODEV; 472 break; 473 } 474 475 lockmgr(&mem_lock, LK_RELEASE); 476 477 return (error); 478 } 479 480 /* 481 * Operations for changing memory attributes. 482 * 483 * This is basically just an ioctl shim for mem_range_attr_get 484 * and mem_range_attr_set. 485 */ 486 static int 487 mem_ioctl(cdev_t dev, u_long cmd, caddr_t data, int flags, struct ucred *cred) 488 { 489 int nd, error = 0; 490 struct mem_range_op *mo = (struct mem_range_op *)data; 491 struct mem_range_desc *md; 492 493 /* is this for us? */ 494 if ((cmd != MEMRANGE_GET) && 495 (cmd != MEMRANGE_SET)) 496 return (ENOTTY); 497 498 /* any chance we can handle this? */ 499 if (mem_range_softc.mr_op == NULL) 500 return (EOPNOTSUPP); 501 502 /* do we have any descriptors? */ 503 if (mem_range_softc.mr_ndesc == 0) 504 return (ENXIO); 505 506 switch (cmd) { 507 case MEMRANGE_GET: 508 nd = imin(mo->mo_arg[0], mem_range_softc.mr_ndesc); 509 if (nd > 0) { 510 md = (struct mem_range_desc *) 511 kmalloc(nd * sizeof(struct mem_range_desc), 512 M_MEMDESC, M_WAITOK); 513 error = mem_range_attr_get(md, &nd); 514 if (!error) 515 error = copyout(md, mo->mo_desc, 516 nd * sizeof(struct mem_range_desc)); 517 kfree(md, M_MEMDESC); 518 } else { 519 nd = mem_range_softc.mr_ndesc; 520 } 521 mo->mo_arg[0] = nd; 522 break; 523 524 case MEMRANGE_SET: 525 md = (struct mem_range_desc *)kmalloc(sizeof(struct mem_range_desc), 526 M_MEMDESC, M_WAITOK); 527 error = copyin(mo->mo_desc, md, sizeof(struct mem_range_desc)); 528 /* clamp description string */ 529 md->mr_owner[sizeof(md->mr_owner) - 1] = 0; 530 if (error == 0) 531 error = mem_range_attr_set(md, &mo->mo_arg[0]); 532 kfree(md, M_MEMDESC); 533 break; 534 } 535 return (error); 536 } 537 538 /* 539 * Implementation-neutral, kernel-callable functions for manipulating 540 * memory range attributes. 541 */ 542 int 543 mem_range_attr_get(struct mem_range_desc *mrd, int *arg) 544 { 545 /* can we handle this? */ 546 if (mem_range_softc.mr_op == NULL) 547 return (EOPNOTSUPP); 548 549 if (*arg == 0) { 550 *arg = mem_range_softc.mr_ndesc; 551 } else { 552 bcopy(mem_range_softc.mr_desc, mrd, (*arg) * sizeof(struct mem_range_desc)); 553 } 554 return (0); 555 } 556 557 int 558 mem_range_attr_set(struct mem_range_desc *mrd, int *arg) 559 { 560 /* can we handle this? */ 561 if (mem_range_softc.mr_op == NULL) 562 return (EOPNOTSUPP); 563 564 return (mem_range_softc.mr_op->set(&mem_range_softc, mrd, arg)); 565 } 566 567 void 568 mem_range_AP_init(void) 569 { 570 if (mem_range_softc.mr_op && mem_range_softc.mr_op->initAP) 571 mem_range_softc.mr_op->initAP(&mem_range_softc); 572 } 573 574 static int 575 random_ioctl(cdev_t dev, u_long cmd, caddr_t data, int flags, struct ucred *cred) 576 { 577 int error; 578 int intr; 579 580 /* 581 * Even inspecting the state is privileged, since it gives a hint 582 * about how easily the randomness might be guessed. 583 */ 584 error = 0; 585 586 switch (cmd) { 587 /* Really handled in upper layer */ 588 case FIOASYNC: 589 break; 590 case MEM_SETIRQ: 591 intr = *(int16_t *)data; 592 if ((error = priv_check_cred(cred, PRIV_ROOT, 0)) != 0) 593 break; 594 if (intr < 0 || intr >= MAX_INTS) 595 return (EINVAL); 596 register_randintr(intr); 597 break; 598 case MEM_CLEARIRQ: 599 intr = *(int16_t *)data; 600 if ((error = priv_check_cred(cred, PRIV_ROOT, 0)) != 0) 601 break; 602 if (intr < 0 || intr >= MAX_INTS) 603 return (EINVAL); 604 unregister_randintr(intr); 605 break; 606 case MEM_RETURNIRQ: 607 error = ENOTSUP; 608 break; 609 case MEM_FINDIRQ: 610 intr = *(int16_t *)data; 611 if ((error = priv_check_cred(cred, PRIV_ROOT, 0)) != 0) 612 break; 613 if (intr < 0 || intr >= MAX_INTS) 614 return (EINVAL); 615 intr = next_registered_randintr(intr); 616 if (intr == MAX_INTS) 617 return (ENOENT); 618 *(u_int16_t *)data = intr; 619 break; 620 default: 621 error = ENOTSUP; 622 break; 623 } 624 return (error); 625 } 626 627 static int 628 mm_filter_read(struct knote *kn, long hint) 629 { 630 return (1); 631 } 632 633 static int 634 mm_filter_write(struct knote *kn, long hint) 635 { 636 return (1); 637 } 638 639 static void 640 dummy_filter_detach(struct knote *kn) {} 641 642 /* Implemented in kern_nrandom.c */ 643 static struct filterops random_read_filtops = 644 { FILTEROP_ISFD|FILTEROP_MPSAFE, NULL, dummy_filter_detach, random_filter_read }; 645 646 static struct filterops mm_read_filtops = 647 { FILTEROP_ISFD|FILTEROP_MPSAFE, NULL, dummy_filter_detach, mm_filter_read }; 648 649 static struct filterops mm_write_filtops = 650 { FILTEROP_ISFD|FILTEROP_MPSAFE, NULL, dummy_filter_detach, mm_filter_write }; 651 652 static int 653 mmkqfilter(struct dev_kqfilter_args *ap) 654 { 655 struct knote *kn = ap->a_kn; 656 cdev_t dev = ap->a_head.a_dev; 657 658 ap->a_result = 0; 659 switch (kn->kn_filter) { 660 case EVFILT_READ: 661 switch (minor(dev)) { 662 case 3: 663 kn->kn_fop = &random_read_filtops; 664 break; 665 default: 666 kn->kn_fop = &mm_read_filtops; 667 break; 668 } 669 break; 670 case EVFILT_WRITE: 671 kn->kn_fop = &mm_write_filtops; 672 break; 673 default: 674 ap->a_result = EOPNOTSUPP; 675 return (0); 676 } 677 678 return (0); 679 } 680 681 int 682 iszerodev(cdev_t dev) 683 { 684 return (zerodev == dev); 685 } 686 687 /* 688 * /dev/upmap and /dev/kpmap. 689 */ 690 static int 691 user_kernel_mapping(int num, vm_ooffset_t offset, vm_ooffset_t *resultp) 692 { 693 struct proc *p; 694 int error; 695 int invfork; 696 697 if ((p = curproc) == NULL) 698 return (EINVAL); 699 700 /* 701 * If this is a child currently in vfork the pmap is shared with 702 * the parent! We need to actually set-up the parent's p_upmap, 703 * not the child's, and we need to set the invfork flag. Userland 704 * will probably adjust its static state so it must be consistent 705 * with the parent or userland will be really badly confused. 706 * 707 * (this situation can happen when user code in vfork() calls 708 * libc's getpid() or some other function which then decides 709 * it wants the upmap). 710 */ 711 if (p->p_flags & P_PPWAIT) { 712 p = p->p_pptr; 713 if (p == NULL) 714 return (EINVAL); 715 invfork = 1; 716 } else { 717 invfork = 0; 718 } 719 720 error = EINVAL; 721 722 switch(num) { 723 case 5: 724 /* 725 * /dev/upmap - maps RW per-process shared user-kernel area. 726 */ 727 if (p->p_upmap == NULL) 728 proc_usermap(p, invfork); 729 else if (invfork) 730 p->p_upmap->invfork = invfork; 731 732 if (p->p_upmap && 733 offset < roundup2(sizeof(*p->p_upmap), PAGE_SIZE)) { 734 /* only good for current process */ 735 *resultp = pmap_kextract((vm_offset_t)p->p_upmap + 736 offset); 737 error = 0; 738 } 739 break; 740 case 6: 741 /* 742 * /dev/kpmap - maps RO shared kernel global page 743 */ 744 if (kpmap && 745 offset < roundup2(sizeof(*kpmap), PAGE_SIZE)) { 746 *resultp = pmap_kextract((vm_offset_t)kpmap + 747 offset); 748 error = 0; 749 } 750 break; 751 default: 752 break; 753 } 754 return error; 755 } 756 757 static void 758 mem_drvinit(void *unused) 759 { 760 761 /* Initialise memory range handling */ 762 if (mem_range_softc.mr_op != NULL) 763 mem_range_softc.mr_op->init(&mem_range_softc); 764 765 make_dev(&mem_ops, 0, UID_ROOT, GID_KMEM, 0640, "mem"); 766 make_dev(&mem_ops, 1, UID_ROOT, GID_KMEM, 0640, "kmem"); 767 make_dev(&mem_ops, 2, UID_ROOT, GID_WHEEL, 0666, "null"); 768 make_dev(&mem_ops, 3, UID_ROOT, GID_WHEEL, 0644, "random"); 769 make_dev(&mem_ops, 4, UID_ROOT, GID_WHEEL, 0644, "urandom"); 770 make_dev(&mem_ops, 5, UID_ROOT, GID_WHEEL, 0666, "upmap"); 771 make_dev(&mem_ops, 6, UID_ROOT, GID_WHEEL, 0444, "kpmap"); 772 zerodev = make_dev(&mem_ops, 12, UID_ROOT, GID_WHEEL, 0666, "zero"); 773 make_dev(&mem_ops_noq, 14, UID_ROOT, GID_WHEEL, 0600, "io"); 774 } 775 776 SYSINIT(memdev, SI_SUB_DRIVERS, SI_ORDER_MIDDLE + CDEV_MAJOR, mem_drvinit, 777 NULL); 778 779