autoconf.c revision 10653 
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 1.37 1995/09/03 05:43:00 julian 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/md_var.h>
59#include <machine/pte.h>
60
61static void setroot(void);
62
63/*
64 * The following several variables are related to
65 * the configuration process, and are used in initializing
66 * the machine.
67 */
68int	dkn;		/* number of iostat dk numbers assigned so far */
69
70#ifdef FFS
71extern struct vfsops	ufs_vfsops;
72#endif
73#ifdef LFS
74extern struct vfsops	lfs_vfsops;
75#endif
76#ifdef NFS
77int nfs_mountroot __P((void *));
78#endif
79#ifdef CD9660
80int cd9660_mountroot __P((void *));
81#endif
82#ifdef MSDOSFS
83int msdosfs_mountroot __P((void *));
84#endif
85#ifdef MFS_ROOT
86int mfs_initminiroot __P((u_char *));
87u_char mfs_root[MFS_ROOT*1024] = "MFS Filesystem goes here";
88u_char end_mfs_root[] = "MFS Filesystem had better STOP here";
89#endif
90
91#include "eisa.h"
92#include "isa.h"
93#if NISA > 0
94      #include <i386/isa/isa_device.h>
95#endif
96
97#include "pci.h"
98#if NPCI > 0
99      #include <pci/pcivar.h>
100#endif
101
102#include "crd.h"
103#if NCRD > 0
104void	pccard_configure();
105#endif
106
107#ifdef CD9660
108/* We need to try out all our potential CDROM drives, so we need a table. */
109static struct {
110	char *name;
111	int major;
112} try_cdrom[] = {
113	{ "cd", 6 },
114	{ "mcd", 7 },
115	{ "scd", 16 },
116	{ "matcd", 17 },
117	{ 0, 0}
118};
119
120int
121find_cdrom_root(dummy)
122	void *dummy;
123{
124	int i,j,k;
125
126	for (j = 0 ; j < 2; j++)
127		for (k = 0 ; try_cdrom[k].name ; k++) {
128			rootdev = makedev(try_cdrom[k].major,j*8);
129			printf("trying rootdev=0x%lx (%s%d)\n",
130				rootdev, try_cdrom[k].name,j);
131			i = (*cd9660_mountroot)(NULL);
132			if (!i) return i;
133		}
134	return EINVAL;
135}
136#endif /* CD9660 */
137
138#include "scbus.h"
139#if NSCBUS > 0
140      #include <scsi/scsiconf.h>
141#endif
142
143void
144configure_start()
145{
146#if NSCBUS > 0
147	scsi_configure_start();
148#endif
149}
150
151void
152configure_finish()
153{
154#if NSCBUS > 0
155	scsi_configure_finish();
156#endif
157}
158
159/*
160 * Determine i/o configuration for a machine.
161 */
162void
163configure(dummy) /* arg not used */
164	void *dummy;
165{
166
167	configure_start();
168
169#if NEISA > 0
170	eisa_configure();
171#endif
172
173
174#if NISA > 0
175	isa_configure();
176#endif
177
178#if NPCI > 0
179	pci_configure();
180#endif
181
182#if NCRD > 0
183	pccard_configure();
184#endif
185
186	configure_finish();
187
188#ifdef MFS_ROOT
189	mfs_initminiroot(mfs_root);		/* XXX UGLY*/
190#endif /* MFS_ROOT */
191
192#ifdef CD9660
193	if ((boothowto & RB_CDROM) && !mountroot)
194		mountroot = find_cdrom_root;
195#endif
196
197#ifdef NFS
198	if (!mountroot && nfs_diskless_valid)
199		mountroot = nfs_mountroot;
200#endif /* NFS */
201
202#ifdef FFS
203	if (!mountroot) {
204		mountroot = vfs_mountroot;	/* XXX goes away*/
205		mountrootvfsops = &ufs_vfsops;
206		/*
207		 * Ignore the -a flag if this kernel isn't compiled
208		 * with a generic root/swap configuration: if we skip
209		 * setroot() and we aren't a generic kernel, chaos
210		 * will ensue because setconf() will be a no-op.
211		 * (rootdev is always initialized to NODEV in a
212		 * generic configuration, so we test for that.)
213		 */
214		if ((boothowto & RB_ASKNAME) == 0 || rootdev != NODEV)
215			setroot();
216	}
217#endif
218#ifdef LFS
219	if (!mountroot) {
220		mountroot = vfs_mountroot;	/* XXX goes away*/
221		mountrootvfsops = &lfs_vfsops;
222		/*
223		 * Ignore the -a flag if this kernel isn't compiled
224		 * with a generic root/swap configuration: if we skip
225		 * setroot() and we aren't a generic kernel, chaos
226		 * will ensue because setconf() will be a no-op.
227		 * (rootdev is always initialized to NODEV in a
228		 * generic configuration, so we test for that.)
229		 */
230		if ((boothowto & RB_ASKNAME) == 0 || rootdev != NODEV)
231			setroot();
232	}
233#endif
234	if (!mountroot) {
235		panic("Nobody wants to mount my root for me");
236	}
237	/*
238	 * Configure swap area and related system
239	 * parameter based on device(s) used.
240	 */
241	setconf();
242	cold = 0;
243}
244/*
245 * Add a SYSINIT entry so that Configure gets called at the right time.
246 */
247SYSINIT(configure, SI_SUB_CONFIGURE, SI_ORDER_FIRST, configure, NULL)
248
249
250int
251setdumpdev(dev)
252	dev_t dev;
253{
254	int maj, psize;
255	long newdumplo;
256
257	if (dev == NODEV) {
258		dumpdev = dev;
259		dumplo = 0;
260		return (0);
261	}
262	maj = major(dev);
263	if (maj >= nblkdev)
264		return (ENXIO);
265	if (bdevsw[maj].d_psize == NULL)
266		return (ENXIO);		/* XXX should sometimes be ENODEV */
267	psize = bdevsw[maj].d_psize(dev);
268	if (psize == -1)
269		return (ENXIO);		/* XXX should sometimes be ENODEV */
270	newdumplo = psize - Maxmem * NBPG / DEV_BSIZE;
271	if (newdumplo < 0)
272		return (ENOSPC);
273	dumpdev = dev;
274	dumplo = newdumplo;
275	return (0);
276}
277
278u_long	bootdev = 0;		/* not a dev_t - encoding is different */
279
280static	char devname[][2] = {
281      {'w','d'},      /* 0 = wd */
282      {'s','w'},      /* 1 = sw */
283#define FDMAJOR 2
284      {'f','d'},      /* 2 = fd */
285      {'w','t'},      /* 3 = wt */
286      {'s','d'},      /* 4 = sd -- new SCSI system */
287};
288
289#define	PARTITIONMASK	0x7
290#define	PARTITIONSHIFT	3
291#define FDUNITSHIFT     6
292#define RAW_PART        2
293
294/*
295 * Attempt to find the device from which we were booted.
296 * If we can do so, and not instructed not to do so,
297 * change rootdev to correspond to the load device.
298 */
299static void
300setroot()
301{
302	int  majdev, mindev, unit, part, adaptor;
303	dev_t temp = 0, orootdev;
304	struct swdevt *swp;
305
306/*printf("howto %x bootdev %x ", boothowto, bootdev);*/
307	if (boothowto & RB_DFLTROOT ||
308	    (bootdev & B_MAGICMASK) != (u_long)B_DEVMAGIC)
309		return;
310	majdev = (bootdev >> B_TYPESHIFT) & B_TYPEMASK;
311	if (majdev > sizeof(devname) / sizeof(devname[0]))
312		return;
313	adaptor = (bootdev >> B_ADAPTORSHIFT) & B_ADAPTORMASK;
314	unit = (bootdev >> B_UNITSHIFT) & B_UNITMASK;
315	if (majdev == FDMAJOR) {
316		part = RAW_PART;
317		mindev = unit << FDUNITSHIFT;
318	}
319	else {
320		part = (bootdev >> B_PARTITIONSHIFT) & B_PARTITIONMASK;
321		mindev = (unit << PARTITIONSHIFT) + part;
322	}
323	orootdev = rootdev;
324	rootdev = makedev(majdev, mindev);
325	/*
326	 * If the original rootdev is the same as the one
327	 * just calculated, don't need to adjust the swap configuration.
328	 */
329	if (rootdev == orootdev)
330		return;
331	printf("changing root device to %c%c%d%c\n",
332		devname[majdev][0], devname[majdev][1],
333		mindev >> (majdev == FDMAJOR ? FDUNITSHIFT : PARTITIONSHIFT),
334		part + 'a');
335}
336