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 1.121 1999/05/10 17:12:40 peter 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"
52 #include "opt_nfsroot.h"
54 #include "opt_rootdevname.h"
56 #include <sys/param.h>
57 #include <sys/systm.h>
60 #include <sys/disklabel.h>
61 #include <sys/diskslice.h>
62 #include <sys/reboot.h>
63 #include <sys/kernel.h>
64 #include <sys/malloc.h>
65 #include <sys/mount.h>
66 #include <sys/sysctl.h>
68 #include <machine/bootinfo.h>
69 #include <machine/cons.h>
70 #include <machine/ipl.h>
71 #include <machine/md_var.h>
73 #include <machine/smp.h>
76 #include <i386/isa/icu.h>
79 #include <ufs/mfs/mfs_extern.h>
84 #include <i386/isa/isa_device.h>
85 #include <i386/isa/pnp.h>
90 #include <i386/eisa/eisaconf.h>
95 #include <pci/pcivar.h>
100 device_t isa_bus_device = 0;
103 static void configure_first __P((void *));
104 static void configure __P((void *));
105 static void configure_final __P((void *));
107 static void configure_finish __P((void));
108 static void configure_start __P((void));
109 static int setdumpdev __P((dev_t dev));
110 static void setroot __P((void));
111 static int setrootbyname __P((char *name));
112 static void gets __P((char *));
114 SYSINIT(configure1, SI_SUB_CONFIGURE, SI_ORDER_FIRST, configure_first, NULL);
115 /* SI_ORDER_SECOND is hookable */
116 SYSINIT(configure2, SI_SUB_CONFIGURE, SI_ORDER_THIRD, configure, NULL);
117 /* SI_ORDER_MIDDLE is hookable */
118 SYSINIT(configure3, SI_SUB_CONFIGURE, SI_ORDER_ANY, configure_final, NULL);
120 dev_t rootdev = NODEV;
121 dev_t dumpdev = NODEV;
123 #if defined(CD9660) || defined(CD9660_ROOT)
125 #include <sys/fcntl.h>
126 #include <sys/proc.h>
127 #include <sys/stat.h>
128 #include <machine/clock.h>
131 * XXX All this CD-ROM root stuff is fairly messy. Ick.
133 * We need to try out all our potential CDROM drives, so we need a table.
147 static int find_cdrom_root __P((void));
156 #if CD9660_ROOTDELAY > 0
157 DELAY(CD9660_ROOTDELAY * 1000000);
160 for (i = 0 ; i < 2; i++)
161 for (j = 0 ; try_cdrom[j].name ; j++) {
162 if (try_cdrom[j].major >= nblkdev)
164 rootdev = makedev(try_cdrom[j].major, i * 8);
165 bd = bdevsw(rootdev);
166 if (bd == NULL || bd->d_open == NULL)
169 printf("trying %s%d as rootdev (0x%x)\n",
170 try_cdrom[j].name, i, rootdev);
171 error = (bd->d_open)(rootdev, FREAD, S_IFBLK, curproc);
173 if (bd->d_close != NULL)
174 (bd->d_close)(rootdev, FREAD, S_IFBLK,
183 #endif /* CD9660 || CD9660_ROOT */
198 * Determine i/o configuration for a machine.
201 configure_first(dummy)
205 configure_start(); /* DDB hook? */
213 /* Allow all routines to decide for themselves if they want intrs */
215 * XXX Since this cannot be achieved on all architectures, we should
216 * XXX go back to disabling all interrupts until configuration is
217 * XXX completed and switch any devices that rely on the current
218 * XXX behavior to no longer rely on interrupts or to register an
219 * XXX interrupt_driven_config_hook for the task.
222 * XXX The above is wrong, because we're implicitly at splhigh(),
223 * XXX and should stay there, so enabling interrupts in the CPU
224 * XXX and the ICU at most gives pending interrupts which just get
228 bsp_apic_configure();
239 /* nexus0 is the top of the i386 device tree */
240 device_add_child(root_bus, "nexus", 0, 0);
242 /* initialize new bus architecture */
243 root_bus_configure();
247 bus_generic_attach(isa_bus_device);
251 * Now we're ready to handle (pending) interrupts.
252 * XXX this is slightly misplaced.
257 * Allow lowering of the ipl to the lowest kernel level if we
258 * panic (or call tsleep() before clearing `cold'). No level is
259 * completely safe (since a panic may occur in a critical region
260 * at splhigh()), but we want at least bio interrupts to work.
266 configure_final(dummy)
271 configure_finish(); /* DDB hook? */
282 * Print out the BIOS's idea of the disk geometries.
284 printf("BIOS Geometries:\n");
285 for (i = 0; i < N_BIOS_GEOM; i++) {
286 unsigned long bios_geom;
287 int max_cylinder, max_head, max_sector;
289 bios_geom = bootinfo.bi_bios_geom[i];
292 * XXX the bootstrap punts a 1200K floppy geometry
293 * when the get-disk-geometry interrupt fails. Skip
294 * drives that have this geometry.
296 if (bios_geom == 0x4f010f)
299 printf(" %x:%08lx ", i, bios_geom);
300 max_cylinder = bios_geom >> 16;
301 max_head = (bios_geom >> 8) & 0xff;
302 max_sector = bios_geom & 0xff;
304 "0..%d=%d cylinders, 0..%d=%d heads, 1..%d=%d sectors\n",
305 max_cylinder, max_cylinder + 1,
306 max_head, max_head + 1,
307 max_sector, max_sector);
309 printf(" %d accounted for\n", bootinfo.bi_n_bios_used);
311 printf("Device configuration finished.\n");
321 * XXX NetBSD has a much cleaner approach to finding root.
322 * XXX We should adopt their code.
324 #if defined(CD9660) || defined(CD9660_ROOT)
325 if ((boothowto & RB_CDROM)) {
327 printf("Considering CD-ROM root f/s.\n");
328 /* NB: find_cdrom_root() sets rootdev if successful. */
329 if (find_cdrom_root() == 0)
330 mountrootfsname = "cd9660";
331 else if (bootverbose)
332 printf("No CD-ROM available as root f/s.\n");
337 if (!mountrootfsname) {
339 printf("Considering MFS root f/s.\n");
341 mountrootfsname = "mfs";
342 else if (bootverbose)
343 printf("No MFS image available as root f/s.\n");
348 if (!mountrootfsname && !nfs_diskless_valid) {
350 printf("Considering BOOTP NFS root f/s.\n");
351 mountrootfsname = "nfs";
353 #endif /* BOOTP_NFSROOT */
354 #if defined(NFS) || defined(NFS_ROOT)
355 if (!mountrootfsname && nfs_diskless_valid) {
357 printf("Considering NFS root f/s.\n");
358 mountrootfsname = "nfs";
362 #if defined(FFS) || defined(FFS_ROOT)
363 if (!mountrootfsname) {
364 mountrootfsname = "ufs";
366 printf("Considering FFS root f/s.\n");
367 if (boothowto & RB_ASKNAME)
374 if (!mountrootfsname) {
375 panic("Nobody wants to mount my root for me");
383 if (setdumpdev(dumpdev) != 0)
399 if (maj >= nblkdev || bdevsw(dev) == NULL)
400 return (ENXIO); /* XXX is this right? */
401 if (bdevsw(dev)->d_psize == NULL)
402 return (ENXIO); /* XXX should be ENODEV ? */
403 psize = bdevsw(dev)->d_psize(dev);
405 return (ENXIO); /* XXX should be ENODEV ? */
407 * XXX should clean up checking in dumpsys() to be more like this,
408 * and nuke dodump sysctl (too many knobs), and move this to
411 newdumplo = psize - Maxmem * PAGE_SIZE / DEV_BSIZE;
420 u_long bootdev = 0; /* not a dev_t - encoding is different */
423 #define FDUNITSHIFT 6
426 * Attempt to find the device from which we were booted.
427 * If we can do so, and not instructed not to do so,
428 * set rootdevs[] and rootdevnames[] to correspond to the
434 int majdev, mindev, unit, slice, part;
435 dev_t newrootdev, dev;
439 if (boothowto & RB_DFLTROOT) {
441 setrootbyname(ROOTDEVNAME);
447 if ((bootdev & B_MAGICMASK) != B_DEVMAGIC)
449 majdev = B_TYPE(bootdev);
450 dev = makedev(majdev, 0);
451 if (majdev >= nblkdev || bdevsw(dev) == NULL)
453 unit = B_UNIT(bootdev);
454 slice = B_SLICE(bootdev);
455 if (slice == WHOLE_DISK_SLICE)
456 slice = COMPATIBILITY_SLICE;
457 if (slice < 0 || slice >= MAX_SLICES)
461 * XXX kludge for inconsistent unit numbering and lack of slice
462 * support for floppies.
464 if (majdev == FDMAJOR) {
465 slice = COMPATIBILITY_SLICE;
467 mindev = unit << FDUNITSHIFT;
469 part = B_PARTITION(bootdev);
470 mindev = dkmakeminor(unit, slice, part);
473 newrootdev = makedev(majdev, mindev);
474 rootdevs[0] = newrootdev;
475 sname = dsname(bdevsw(newrootdev)->d_name, unit, slice, part, partname);
476 rootdevnames[0] = malloc(strlen(sname) + 2, M_DEVBUF, M_NOWAIT);
477 sprintf(rootdevnames[0], "%s%s", sname, partname);
480 * For properly dangerously dedicated disks (ones with a historical
481 * bogus partition table), the boot blocks will give slice = 4, but
482 * the kernel will only provide the compatibility slice since it
483 * knows that slice 4 is not a real slice. Arrange to try mounting
484 * the compatibility slice as root if mounting the slice passed by
485 * the boot blocks fails. This handles the dangerously dedicated
486 * case and perhaps others.
488 if (slice == COMPATIBILITY_SLICE)
490 slice = COMPATIBILITY_SLICE;
491 rootdevs[1] = dkmodslice(newrootdev, slice);
492 sname = dsname(bdevsw(newrootdev)->d_name, unit, slice, part, partname);
493 rootdevnames[1] = malloc(strlen(sname) + 2, M_DEVBUF, M_NOWAIT);
494 sprintf(rootdevnames[1], "%s%s", sname, partname);
499 sysctl_kern_dumpdev SYSCTL_HANDLER_ARGS
504 ndumpdev = dev2udev(dumpdev);
505 error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req);
506 if (error == 0 && req->newptr != NULL)
507 error = setdumpdev(udev2dev(ndumpdev, 1));
511 SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW,
512 0, sizeof dumpdev, sysctl_kern_dumpdev, "T,dev_t", "");
517 setrootbyname(char *name)
520 int bd, unit, slice, part;
526 while (cp != '\0' && (*cp < '0' || *cp > '9'))
529 printf("missing device name\n");
533 printf("missing unit number\n");
538 for (bd = 0; bd < nblkdev; bd++) {
539 dev = makedev(bd, 0);
540 if (bdevsw(dev) != NULL &&
541 strcmp(bdevsw(dev)->d_name, name) == 0)
546 while (*cp >= '0' && *cp <= '9')
547 unit += 10 * unit + *cp++ - '0';
548 if (*cp == 's' && cp[1] >= '0' && cp[1] <= '9') {
552 if (*cp >= 'a' && *cp <= 'h') {
557 printf("junk after name\n");
560 printf("driver=%s, unit=%d, slice=%d, part=%d\n",
561 name, unit, slice, part);
562 rootdev = makedev(bd, dkmakeminor(unit, slice, part));
574 printf("root device? ");
576 i = setrootbyname(name);
580 printf("use one of:\n");
581 for (i = 0; i < nblkdev; i++) {
583 if (bdevsw(dev) != NULL)
584 printf(" %s", bdevsw(dev)->d_name);
586 printf(" followed by a unit number...\n");
599 printf("%c", c = cngetc() & 0177);