2 * Copyright (c) 1990 The Regents of the University of California.
5 * This code is derived from software contributed to Berkeley by
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * from: @(#)autoconf.c 7.1 (Berkeley) 5/9/91
37 * $Id: autoconf.c,v 1.124 1999/05/31 11:25:39 phk Exp $
41 * Setup the system to run on the current machine.
43 * Configure() is called at boot time and initializes the vba
44 * device tables and the memory controller monitoring. Available
45 * devices are determined (from possibilities mentioned in ioconf.c),
46 * and the drivers are initialized.
48 #include "opt_bootp.h"
50 #include "opt_cd9660.h"
51 #include "opt_nfsroot.h"
53 #include "opt_rootdevname.h"
55 #include <sys/param.h>
56 #include <sys/systm.h>
59 #include <sys/disklabel.h>
60 #include <sys/diskslice.h>
61 #include <sys/reboot.h>
62 #include <sys/kernel.h>
63 #include <sys/malloc.h>
64 #include <sys/mount.h>
65 #include <sys/sysctl.h>
67 #include <machine/bootinfo.h>
68 #include <machine/cons.h>
69 #include <machine/ipl.h>
70 #include <machine/md_var.h>
72 #include <machine/smp.h>
75 #include <i386/isa/icu.h>
79 #include <i386/isa/isa_device.h>
80 #include <i386/isa/pnp.h>
85 #include <i386/eisa/eisaconf.h>
90 #include <pci/pcivar.h>
95 device_t isa_bus_device = 0;
98 static void configure_first __P((void *));
99 static void configure __P((void *));
100 static void configure_final __P((void *));
102 static void configure_finish __P((void));
103 static void configure_start __P((void));
104 static int setdumpdev __P((dev_t dev));
105 #if defined(FFS) || defined(FFS_ROOT)
106 static void setroot __P((void));
108 static int setrootbyname __P((char *name));
109 static void gets __P((char *));
111 SYSINIT(configure1, SI_SUB_CONFIGURE, SI_ORDER_FIRST, configure_first, NULL);
112 /* SI_ORDER_SECOND is hookable */
113 SYSINIT(configure2, SI_SUB_CONFIGURE, SI_ORDER_THIRD, configure, NULL);
114 /* SI_ORDER_MIDDLE is hookable */
115 SYSINIT(configure3, SI_SUB_CONFIGURE, SI_ORDER_ANY, configure_final, NULL);
117 dev_t rootdev = NODEV;
118 dev_t dumpdev = NODEV;
120 #if defined(CD9660) || defined(CD9660_ROOT)
122 #include <sys/fcntl.h>
123 #include <sys/proc.h>
124 #include <sys/stat.h>
125 #include <machine/clock.h>
128 * XXX All this CD-ROM root stuff is fairly messy. Ick.
130 * We need to try out all our potential CDROM drives, so we need a table.
144 static int find_cdrom_root __P((void));
153 #if CD9660_ROOTDELAY > 0
154 DELAY(CD9660_ROOTDELAY * 1000000);
157 for (i = 0 ; i < 2; i++)
158 for (j = 0 ; try_cdrom[j].name ; j++) {
159 if (try_cdrom[j].major >= NUMCDEVSW)
161 rootdev = makebdev(try_cdrom[j].major, i * 8);
162 bd = bdevsw(rootdev);
163 if (bd == NULL || bd->d_open == NULL)
166 printf("trying %s%d as rootdev (0x%x)\n",
167 try_cdrom[j].name, i, rootdev);
168 error = (bd->d_open)(rootdev, FREAD, S_IFBLK, curproc);
170 if (bd->d_close != NULL)
171 (bd->d_close)(rootdev, FREAD, S_IFBLK,
180 #endif /* CD9660 || CD9660_ROOT */
195 * Determine i/o configuration for a machine.
198 configure_first(dummy)
202 configure_start(); /* DDB hook? */
210 /* Allow all routines to decide for themselves if they want intrs */
212 * XXX Since this cannot be achieved on all architectures, we should
213 * XXX go back to disabling all interrupts until configuration is
214 * XXX completed and switch any devices that rely on the current
215 * XXX behavior to no longer rely on interrupts or to register an
216 * XXX interrupt_driven_config_hook for the task.
219 * XXX The above is wrong, because we're implicitly at splhigh(),
220 * XXX and should stay there, so enabling interrupts in the CPU
221 * XXX and the ICU at most gives pending interrupts which just get
225 bsp_apic_configure();
236 /* nexus0 is the top of the i386 device tree */
237 device_add_child(root_bus, "nexus", 0, 0);
239 /* initialize new bus architecture */
240 root_bus_configure();
244 bus_generic_attach(isa_bus_device);
248 * Now we're ready to handle (pending) interrupts.
249 * XXX this is slightly misplaced.
254 * Allow lowering of the ipl to the lowest kernel level if we
255 * panic (or call tsleep() before clearing `cold'). No level is
256 * completely safe (since a panic may occur in a critical region
257 * at splhigh()), but we want at least bio interrupts to work.
263 configure_final(dummy)
268 configure_finish(); /* DDB hook? */
279 * Print out the BIOS's idea of the disk geometries.
281 printf("BIOS Geometries:\n");
282 for (i = 0; i < N_BIOS_GEOM; i++) {
283 unsigned long bios_geom;
284 int max_cylinder, max_head, max_sector;
286 bios_geom = bootinfo.bi_bios_geom[i];
289 * XXX the bootstrap punts a 1200K floppy geometry
290 * when the get-disk-geometry interrupt fails. Skip
291 * drives that have this geometry.
293 if (bios_geom == 0x4f010f)
296 printf(" %x:%08lx ", i, bios_geom);
297 max_cylinder = bios_geom >> 16;
298 max_head = (bios_geom >> 8) & 0xff;
299 max_sector = bios_geom & 0xff;
301 "0..%d=%d cylinders, 0..%d=%d heads, 1..%d=%d sectors\n",
302 max_cylinder, max_cylinder + 1,
303 max_head, max_head + 1,
304 max_sector, max_sector);
306 printf(" %d accounted for\n", bootinfo.bi_n_bios_used);
308 printf("Device configuration finished.\n");
318 * XXX NetBSD has a much cleaner approach to finding root.
319 * XXX We should adopt their code.
321 #if defined(CD9660) || defined(CD9660_ROOT)
322 if ((boothowto & RB_CDROM)) {
324 printf("Considering CD-ROM root f/s.\n");
325 /* NB: find_cdrom_root() sets rootdev if successful. */
326 if (find_cdrom_root() == 0)
327 mountrootfsname = "cd9660";
328 else if (bootverbose)
329 printf("No CD-ROM available as root f/s.\n");
334 if (!mountrootfsname && !nfs_diskless_valid) {
336 printf("Considering BOOTP NFS root f/s.\n");
337 mountrootfsname = "nfs";
339 #endif /* BOOTP_NFSROOT */
340 #if defined(NFS) || defined(NFS_ROOT)
341 if (!mountrootfsname && nfs_diskless_valid) {
343 printf("Considering NFS root f/s.\n");
344 mountrootfsname = "nfs";
348 #if defined(FFS) || defined(FFS_ROOT)
349 if (!mountrootfsname) {
350 mountrootfsname = "ufs";
352 printf("Considering FFS root f/s.\n");
353 if (boothowto & RB_ASKNAME)
360 if (!mountrootfsname) {
361 panic("Nobody wants to mount my root for me");
369 if (setdumpdev(dumpdev) != 0)
385 if (bdevsw(dev) == NULL)
386 return (ENXIO); /* XXX is this right? */
387 if (bdevsw(dev)->d_psize == NULL)
388 return (ENXIO); /* XXX should be ENODEV ? */
389 psize = bdevsw(dev)->d_psize(dev);
391 return (ENXIO); /* XXX should be ENODEV ? */
393 * XXX should clean up checking in dumpsys() to be more like this,
394 * and nuke dodump sysctl (too many knobs), and move this to
397 newdumplo = psize - Maxmem * PAGE_SIZE / DEV_BSIZE;
406 u_long bootdev = 0; /* not a dev_t - encoding is different */
409 #define FDUNITSHIFT 6
411 #if defined(FFS) || defined(FFS_ROOT)
413 * Attempt to find the device from which we were booted.
414 * If we can do so, and not instructed not to do so,
415 * set rootdevs[] and rootdevnames[] to correspond to the
421 int majdev, mindev, unit, slice, part;
422 dev_t newrootdev, dev;
426 if (boothowto & RB_DFLTROOT) {
428 setrootbyname(ROOTDEVNAME);
434 if ((bootdev & B_MAGICMASK) != B_DEVMAGIC)
436 majdev = B_TYPE(bootdev);
437 dev = makebdev(majdev, 0);
438 if (bdevsw(dev) == NULL)
440 unit = B_UNIT(bootdev);
441 slice = B_SLICE(bootdev);
442 if (slice == WHOLE_DISK_SLICE)
443 slice = COMPATIBILITY_SLICE;
444 if (slice < 0 || slice >= MAX_SLICES)
448 * XXX kludge for inconsistent unit numbering and lack of slice
449 * support for floppies.
451 if (majdev == FDMAJOR) {
452 slice = COMPATIBILITY_SLICE;
454 mindev = unit << FDUNITSHIFT;
456 part = B_PARTITION(bootdev);
457 mindev = dkmakeminor(unit, slice, part);
460 newrootdev = makebdev(majdev, mindev);
461 rootdevs[0] = newrootdev;
462 sname = dsname(bdevsw(newrootdev)->d_name, unit, slice, part, partname);
463 rootdevnames[0] = malloc(strlen(sname) + 2, M_DEVBUF, M_NOWAIT);
464 sprintf(rootdevnames[0], "%s%s", sname, partname);
467 * For properly dangerously dedicated disks (ones with a historical
468 * bogus partition table), the boot blocks will give slice = 4, but
469 * the kernel will only provide the compatibility slice since it
470 * knows that slice 4 is not a real slice. Arrange to try mounting
471 * the compatibility slice as root if mounting the slice passed by
472 * the boot blocks fails. This handles the dangerously dedicated
473 * case and perhaps others.
475 if (slice == COMPATIBILITY_SLICE)
477 slice = COMPATIBILITY_SLICE;
478 rootdevs[1] = dkmodslice(newrootdev, slice);
479 sname = dsname(bdevsw(newrootdev)->d_name, unit, slice, part, partname);
480 rootdevnames[1] = malloc(strlen(sname) + 2, M_DEVBUF, M_NOWAIT);
481 sprintf(rootdevnames[1], "%s%s", sname, partname);
487 sysctl_kern_dumpdev SYSCTL_HANDLER_ARGS
492 ndumpdev = dev2udev(dumpdev);
493 error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req);
494 if (error == 0 && req->newptr != NULL)
495 error = setdumpdev(udev2dev(ndumpdev, 1));
499 SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW,
500 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,dev_t", "");
505 setrootbyname(char *name)
508 int bd, unit, slice, part;
514 while (cp != '\0' && (*cp < '0' || *cp > '9'))
517 printf("missing device name\n");
521 printf("missing unit number\n");
526 for (bd = 0; bd < NUMCDEVSW; bd++) {
527 dev = makebdev(bd, 0);
528 if (bdevsw(dev) != NULL &&
529 strcmp(bdevsw(dev)->d_name, name) == 0)
534 while (*cp >= '0' && *cp <= '9')
535 unit += 10 * unit + *cp++ - '0';
536 if (*cp == 's' && cp[1] >= '0' && cp[1] <= '9') {
540 if (*cp >= 'a' && *cp <= 'h') {
545 printf("junk after name\n");
548 printf("driver=%s, unit=%d, slice=%d, part=%d\n",
549 name, unit, slice, part);
550 rootdev = makebdev(bd, dkmakeminor(unit, slice, part));
562 printf("root device? ");
564 i = setrootbyname(name);
568 printf("use one of:\n");
569 for (i = 0; i < NUMCDEVSW; i++) {
570 dev = makebdev(i, 0);
571 if (bdevsw(dev) != NULL)
572 printf(" %s", bdevsw(dev)->d_name);
574 printf(" followed by a unit number...\n");
587 printf("%c", c = cngetc() & 0177);