autoconf.c revision 10665 
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 1.38 1995/09/09 18:09:41 davidg 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>	/* mountrootvfsops, struct vfsops*/
57
58#include <machine/cons.h>
59#include <machine/md_var.h>
60#include <machine/pte.h>
61
62static void configure __P((void *));
63SYSINIT(configure, SI_SUB_CONFIGURE, SI_ORDER_FIRST, configure, NULL)
64
65int find_cdrom_root __P((void *));
66void configure_start __P((void));
67void configure_finish __P((void));
68
69static void setroot(void);
70
71/*
72 * The following several variables are related to
73 * the configuration process, and are used in initializing
74 * the machine.
75 */
76int	dkn;		/* number of iostat dk numbers assigned so far */
77
78#ifdef FFS
79extern struct vfsops	ufs_vfsops;
80#endif
81#ifdef LFS
82extern struct vfsops	lfs_vfsops;
83#endif
84#ifdef NFS
85int nfs_mountroot __P((void *));
86#endif
87#ifdef CD9660
88int cd9660_mountroot __P((void *));
89#endif
90#ifdef MSDOSFS
91int msdosfs_mountroot __P((void *));
92#endif
93#ifdef MFS_ROOT
94int mfs_initminiroot __P((u_char *));
95u_char mfs_root[MFS_ROOT*1024] = "MFS Filesystem goes here";
96u_char end_mfs_root[] = "MFS Filesystem had better STOP here";
97#endif
98
99#include "eisa.h"
100#include "isa.h"
101#if NISA > 0
102      #include <i386/isa/isa_device.h>
103#endif
104
105#include "pci.h"
106#if NPCI > 0
107      #include <pci/pcivar.h>
108#endif
109
110#include "crd.h"
111#if NCRD > 0
112void	pccard_configure();
113#endif
114
115#ifdef CD9660
116/* We need to try out all our potential CDROM drives, so we need a table. */
117static struct {
118	char *name;
119	int major;
120} try_cdrom[] = {
121	{ "cd", 6 },
122	{ "mcd", 7 },
123	{ "scd", 16 },
124	{ "matcd", 17 },
125	{ 0, 0}
126};
127
128int
129find_cdrom_root(dummy)
130	void *dummy;
131{
132	int i,j,k;
133
134	for (j = 0 ; j < 2; j++)
135		for (k = 0 ; try_cdrom[k].name ; k++) {
136			rootdev = makedev(try_cdrom[k].major,j*8);
137			printf("trying rootdev=0x%lx (%s%d)\n",
138				rootdev, try_cdrom[k].name,j);
139			i = (*cd9660_mountroot)((void *)NULL);
140			if (!i) return i;
141		}
142	return EINVAL;
143}
144#endif /* CD9660 */
145
146#include "scbus.h"
147#if NSCBUS > 0
148      #include <scsi/scsiconf.h>
149#endif
150
151void
152configure_start()
153{
154#if NSCBUS > 0
155	scsi_configure_start();
156#endif
157}
158
159void
160configure_finish()
161{
162#if NSCBUS > 0
163	scsi_configure_finish();
164#endif
165}
166
167/*
168 * Determine i/o configuration for a machine.
169 */
170static void
171configure(dummy)
172	void *dummy;
173{
174
175	configure_start();
176
177#if NEISA > 0
178	eisa_configure();
179#endif
180
181
182#if NISA > 0
183	isa_configure();
184#endif
185
186#if NPCI > 0
187	pci_configure();
188#endif
189
190#if NCRD > 0
191	pccard_configure();
192#endif
193
194	configure_finish();
195
196	cninit_finish();
197
198#ifdef MFS_ROOT
199	mfs_initminiroot(mfs_root);		/* XXX UGLY*/
200#endif /* MFS_ROOT */
201
202#ifdef CD9660
203	if ((boothowto & RB_CDROM) && !mountroot)
204		mountroot = find_cdrom_root;
205#endif
206
207#ifdef NFS
208	if (!mountroot && nfs_diskless_valid)
209		mountroot = nfs_mountroot;
210#endif /* NFS */
211
212#ifdef FFS
213	if (!mountroot) {
214		mountroot = vfs_mountroot;	/* XXX goes away*/
215		mountrootvfsops = &ufs_vfsops;
216		/*
217		 * Ignore the -a flag if this kernel isn't compiled
218		 * with a generic root/swap configuration: if we skip
219		 * setroot() and we aren't a generic kernel, chaos
220		 * will ensue because setconf() will be a no-op.
221		 * (rootdev is always initialized to NODEV in a
222		 * generic configuration, so we test for that.)
223		 */
224		if ((boothowto & RB_ASKNAME) == 0 || rootdev != NODEV)
225			setroot();
226	}
227#endif
228#ifdef LFS
229	if (!mountroot) {
230		mountroot = vfs_mountroot;	/* XXX goes away*/
231		mountrootvfsops = &lfs_vfsops;
232		/*
233		 * Ignore the -a flag if this kernel isn't compiled
234		 * with a generic root/swap configuration: if we skip
235		 * setroot() and we aren't a generic kernel, chaos
236		 * will ensue because setconf() will be a no-op.
237		 * (rootdev is always initialized to NODEV in a
238		 * generic configuration, so we test for that.)
239		 */
240		if ((boothowto & RB_ASKNAME) == 0 || rootdev != NODEV)
241			setroot();
242	}
243#endif
244	if (!mountroot) {
245		panic("Nobody wants to mount my root for me");
246	}
247	/*
248	 * Configure swap area and related system
249	 * parameter based on device(s) used.
250	 */
251	setconf();
252	cold = 0;
253}
254
255int
256setdumpdev(dev)
257	dev_t dev;
258{
259	int maj, psize;
260	long newdumplo;
261
262	if (dev == NODEV) {
263		dumpdev = dev;
264		dumplo = 0;
265		return (0);
266	}
267	maj = major(dev);
268	if (maj >= nblkdev)
269		return (ENXIO);
270	if (bdevsw[maj].d_psize == NULL)
271		return (ENXIO);		/* XXX should sometimes be ENODEV */
272	psize = bdevsw[maj].d_psize(dev);
273	if (psize == -1)
274		return (ENXIO);		/* XXX should sometimes be ENODEV */
275	newdumplo = psize - Maxmem * NBPG / DEV_BSIZE;
276	if (newdumplo < 0)
277		return (ENOSPC);
278	dumpdev = dev;
279	dumplo = newdumplo;
280	return (0);
281}
282
283u_long	bootdev = 0;		/* not a dev_t - encoding is different */
284
285static	char devname[][2] = {
286      {'w','d'},      /* 0 = wd */
287      {'s','w'},      /* 1 = sw */
288#define FDMAJOR 2
289      {'f','d'},      /* 2 = fd */
290      {'w','t'},      /* 3 = wt */
291      {'s','d'},      /* 4 = sd -- new SCSI system */
292};
293
294#define	PARTITIONMASK	0x7
295#define	PARTITIONSHIFT	3
296#define FDUNITSHIFT     6
297#define RAW_PART        2
298
299/*
300 * Attempt to find the device from which we were booted.
301 * If we can do so, and not instructed not to do so,
302 * change rootdev to correspond to the load device.
303 */
304static void
305setroot()
306{
307	int  majdev, mindev, unit, part, adaptor;
308	dev_t temp = 0, orootdev;
309	struct swdevt *swp;
310
311/*printf("howto %x bootdev %x ", boothowto, bootdev);*/
312	if (boothowto & RB_DFLTROOT ||
313	    (bootdev & B_MAGICMASK) != (u_long)B_DEVMAGIC)
314		return;
315	majdev = (bootdev >> B_TYPESHIFT) & B_TYPEMASK;
316	if (majdev > sizeof(devname) / sizeof(devname[0]))
317		return;
318	adaptor = (bootdev >> B_ADAPTORSHIFT) & B_ADAPTORMASK;
319	unit = (bootdev >> B_UNITSHIFT) & B_UNITMASK;
320	if (majdev == FDMAJOR) {
321		part = RAW_PART;
322		mindev = unit << FDUNITSHIFT;
323	}
324	else {
325		part = (bootdev >> B_PARTITIONSHIFT) & B_PARTITIONMASK;
326		mindev = (unit << PARTITIONSHIFT) + part;
327	}
328	orootdev = rootdev;
329	rootdev = makedev(majdev, mindev);
330	/*
331	 * If the original rootdev is the same as the one
332	 * just calculated, don't need to adjust the swap configuration.
333	 */
334	if (rootdev == orootdev)
335		return;
336	printf("changing root device to %c%c%d%c\n",
337		devname[majdev][0], devname[majdev][1],
338		mindev >> (majdev == FDMAJOR ? FDUNITSHIFT : PARTITIONSHIFT),
339		part + 'a');
340}
341