autoconf.c revision 16075 
1/*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * William Jolitz.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
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.
23 *
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
34 * SUCH DAMAGE.
35 *
36 *	from: @(#)autoconf.c	7.1 (Berkeley) 5/9/91
37 *	$Id: autoconf.c,v 1.53 1996/05/02 14:19:39 phk Exp $
38 */
39
40/*
41 * Setup the system to run on the current machine.
42 *
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.
47 */
48#include <sys/param.h>
49#include <sys/systm.h>
50#include <sys/buf.h>
51#include <sys/dkstat.h>
52#include <sys/conf.h>
53#include <sys/dmap.h>
54#include <sys/reboot.h>
55#include <sys/kernel.h>
56#include <sys/mount.h>
57#include <sys/sysctl.h>
58
59#include <machine/cons.h>
60#include <machine/cpu.h>
61#include <machine/md_var.h>
62#include <i386/isa/icu.h> /* For interrupts */
63
64#include "isa.h"
65#if NISA > 0
66#include <i386/isa/isa_device.h>
67#endif
68
69#include "eisa.h"
70#if NEISA > 0
71#include <i386/eisa/eisaconf.h>
72#endif
73
74#include "pci.h"
75#if NPCI > 0
76#include <pci/pcivar.h>
77#endif
78
79#include "crd.h"
80#if NCRD > 0
81#include <pccard/driver.h>
82#endif
83
84#include "scbus.h"
85#if NSCBUS > 0
86#include <scsi/scsiconf.h>
87#endif
88
89static void	configure __P((void *));
90SYSINIT(configure, SI_SUB_CONFIGURE, SI_ORDER_FIRST, configure, NULL)
91
92#ifdef MFS_ROOT
93extern struct vfsops	mfs_vfsops;
94#endif
95#ifdef FFS
96extern struct vfsops	ufs_vfsops;
97#endif
98#ifdef LFS
99extern struct vfsops	lfs_vfsops;
100#endif
101#ifdef NFS
102extern int	nfs_mountroot __P((void *));
103#endif
104#ifdef CD9660
105extern int	cd9660_mountroot __P((void *));
106#endif
107#ifdef MSDOSFS
108extern int	msdosfs_mountroot __P((void *));
109#endif
110
111static void	configure_finish __P((void));
112static void	configure_start __P((void));
113static int	setdumpdev __P((dev_t dev));
114static void	setroot __P((void));
115
116#ifdef CD9660
117/* We need to try out all our potential CDROM drives, so we need a table. */
118static struct {
119	char *name;
120	int major;
121} try_cdrom[] = {
122	{ "cd", 6 },
123	{ "mcd", 7 },
124	{ "scd", 16 },
125	{ "matcd", 17 },
126	{ 0, 0}
127};
128
129static int	find_cdrom_root __P((void *));
130
131static int
132find_cdrom_root(dummy)
133	void *dummy;
134{
135	int i,j,k;
136
137	for (j = 0 ; j < 2; j++)
138		for (k = 0 ; try_cdrom[k].name ; k++) {
139			rootdev = makedev(try_cdrom[k].major,j*8);
140			printf("trying rootdev=0x%lx (%s%d)\n",
141				rootdev, try_cdrom[k].name,j);
142			i = (*cd9660_mountroot)((void *)NULL);
143			if (!i) return i;
144		}
145	return EINVAL;
146}
147#endif /* CD9660 */
148
149static void
150configure_start()
151{
152#if NSCBUS > 0
153	scsi_configure_start();
154#endif
155}
156
157static void
158configure_finish()
159{
160#if NSCBUS > 0
161	scsi_configure_finish();
162#endif
163}
164
165/*
166 * Determine i/o configuration for a machine.
167 */
168static void
169configure(dummy)
170	void *dummy;
171{
172
173	configure_start();
174
175	/* Allow all routines to decide for themselves if they want intrs */
176        enable_intr();
177        INTREN(IRQ_SLAVE);
178
179#if NCRD > 0
180	/* Before isa_configure to avoid ISA drivers finding our cards */
181	pccard_configure();
182#endif
183
184#if NEISA > 0
185	eisa_configure();
186#endif
187
188#if NPCI > 0
189	pci_configure();
190#endif
191
192#if NISA > 0
193	isa_configure();
194#endif
195
196	configure_finish();
197
198	cninit_finish();
199
200	if (bootverbose)
201		printf("Device configuration finished.\n");
202
203#ifdef CD9660
204	if ((boothowto & RB_CDROM) && !mountroot) {
205		if (bootverbose)
206			printf("Considering CD-ROM root f/s.\n");
207		mountroot = find_cdrom_root;
208	}
209#endif
210
211#ifdef NFS
212	if (!mountroot && nfs_diskless_valid) {
213		if (bootverbose)
214			printf("Considering NFS root f/s.\n");
215		mountroot = nfs_mountroot;
216	}
217#endif /* NFS */
218
219#ifdef MFS_ROOT
220	if (!mountroot) {
221		if (bootverbose)
222			printf("Considering MFS root f/s.\n");
223		mountroot = vfs_mountroot;	/* XXX goes away*/
224		mountrootvfsops = &mfs_vfsops;
225		/*
226		 * Ignore the -a flag if this kernel isn't compiled
227		 * with a generic root/swap configuration: if we skip
228		 * setroot() and we aren't a generic kernel, chaos
229		 * will ensue because setconf() will be a no-op.
230		 * (rootdev is always initialized to NODEV in a
231		 * generic configuration, so we test for that.)
232		 */
233		if ((boothowto & RB_ASKNAME) == 0 || rootdev != NODEV)
234			setroot();
235	}
236#endif
237#ifdef FFS
238	if (!mountroot) {
239		if (bootverbose)
240			printf("Considering FFS root f/s.\n");
241		mountroot = vfs_mountroot;	/* XXX goes away*/
242		mountrootvfsops = &ufs_vfsops;
243		/*
244		 * Ignore the -a flag if this kernel isn't compiled
245		 * with a generic root/swap configuration: if we skip
246		 * setroot() and we aren't a generic kernel, chaos
247		 * will ensue because setconf() will be a no-op.
248		 * (rootdev is always initialized to NODEV in a
249		 * generic configuration, so we test for that.)
250		 */
251		if ((boothowto & RB_ASKNAME) == 0 || rootdev != NODEV)
252			setroot();
253	}
254#endif
255#ifdef LFS
256	if (!mountroot) {
257		if (bootverbose)
258			printf("Considering LFS root f/s.\n");
259		mountroot = vfs_mountroot;	/* XXX goes away*/
260		mountrootvfsops = &lfs_vfsops;
261		/*
262		 * Ignore the -a flag if this kernel isn't compiled
263		 * with a generic root/swap configuration: if we skip
264		 * setroot() and we aren't a generic kernel, chaos
265		 * will ensue because setconf() will be a no-op.
266		 * (rootdev is always initialized to NODEV in a
267		 * generic configuration, so we test for that.)
268		 */
269		if ((boothowto & RB_ASKNAME) == 0 || rootdev != NODEV)
270			setroot();
271	}
272#endif
273	if (!mountroot) {
274		panic("Nobody wants to mount my root for me");
275	}
276	/*
277	 * Configure swap area and related system
278	 * parameter based on device(s) used.
279	 */
280	if (bootverbose)
281		printf("Configuring root and swap devs.\n");
282	setconf();
283	cold = 0;
284	if (bootverbose)
285		printf("configure() finished.\n");
286}
287
288static int
289setdumpdev(dev)
290	dev_t dev;
291{
292	int maj, psize;
293	long newdumplo;
294
295	if (dev == NODEV) {
296		dumpdev = dev;
297		dumplo = 0;
298		return (0);
299	}
300	maj = major(dev);
301	if (maj >= nblkdev)
302		return (ENXIO);
303	if (bdevsw[maj] == NULL)
304		return (ENXIO);		/* XXX is this right? */
305	if (bdevsw[maj]->d_psize == NULL)
306		return (ENXIO);		/* XXX should be ENODEV ? */
307	psize = bdevsw[maj]->d_psize(dev);
308	if (psize == -1)
309		return (ENXIO);		/* XXX should be ENODEV ? */
310	newdumplo = psize - Maxmem * PAGE_SIZE / DEV_BSIZE;
311	if (newdumplo < 0)
312		return (ENOSPC);
313	dumpdev = dev;
314	dumplo = newdumplo;
315	return (0);
316}
317
318u_long	bootdev = 0;		/* not a dev_t - encoding is different */
319
320static	char devname[][2] = {
321      {'w','d'},      /* 0 = wd */
322      {'s','w'},      /* 1 = sw */
323#define FDMAJOR 2
324      {'f','d'},      /* 2 = fd */
325      {'w','t'},      /* 3 = wt */
326      {'s','d'},      /* 4 = sd -- new SCSI system */
327};
328
329#define	PARTITIONMASK	0x7
330#define	PARTITIONSHIFT	3
331#define FDUNITSHIFT     6
332#define RAW_PART        2
333
334/*
335 * Attempt to find the device from which we were booted.
336 * If we can do so, and not instructed not to do so,
337 * change rootdev to correspond to the load device.
338 */
339static void
340setroot()
341{
342	int  majdev, mindev, unit, part, adaptor;
343	dev_t orootdev;
344
345/*printf("howto %x bootdev %x ", boothowto, bootdev);*/
346	if (boothowto & RB_DFLTROOT ||
347	    (bootdev & B_MAGICMASK) != (u_long)B_DEVMAGIC)
348		return;
349	majdev = (bootdev >> B_TYPESHIFT) & B_TYPEMASK;
350	if (majdev > sizeof(devname) / sizeof(devname[0]))
351		return;
352	adaptor = (bootdev >> B_ADAPTORSHIFT) & B_ADAPTORMASK;
353	unit = (bootdev >> B_UNITSHIFT) & B_UNITMASK;
354	if (majdev == FDMAJOR) {
355		part = RAW_PART;
356		mindev = unit << FDUNITSHIFT;
357	}
358	else {
359		part = (bootdev >> B_PARTITIONSHIFT) & B_PARTITIONMASK;
360		mindev = (unit << PARTITIONSHIFT) + part;
361	}
362	orootdev = rootdev;
363	rootdev = makedev(majdev, mindev);
364	/*
365	 * If the original rootdev is the same as the one
366	 * just calculated, don't need to adjust the swap configuration.
367	 */
368	if (rootdev == orootdev)
369		return;
370	printf("changing root device to %c%c%d%c\n",
371		devname[majdev][0], devname[majdev][1],
372		mindev >> (majdev == FDMAJOR ? FDUNITSHIFT : PARTITIONSHIFT),
373		part + 'a');
374}
375
376static int
377sysctl_kern_dumpdev SYSCTL_HANDLER_ARGS
378{
379	int error;
380	dev_t ndumpdev;
381
382	ndumpdev = dumpdev;
383	error = sysctl_handle_opaque(oidp, &ndumpdev, sizeof ndumpdev, req);
384	if (!error && ndumpdev != dumpdev) {
385		error = setdumpdev(ndumpdev);
386	}
387	return (error);
388}
389
390SYSCTL_PROC(_kern, KERN_DUMPDEV, dumpdev, CTLTYPE_OPAQUE|CTLFLAG_RW,
391	0, sizeof dumpdev, sysctl_kern_dumpdev, "I", "");
392