autoconf.c revision 10358 
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 1.34 1995/07/16 10:45:04 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>	/* 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
70int vfs_mountroot __P((caddr_t));	/* XXX goes away*/
71#ifdef FFS
72extern struct vfsops	ufs_vfsops;
73#endif
74#ifdef LFS
75extern struct vfsops	lfs_vfsops;
76#endif
77#ifdef NFS
78int nfs_mountroot __P((void));
79#endif
80#ifdef CD9660
81int cd9660_mountroot __P((void));
82#endif
83#ifdef MSDOSFS
84int msdosfs_mountroot __P((void));
85#endif
86#ifdef MFS_ROOT
87int mfs_initminiroot __P((u_char *));
88u_char mfs_root[MFS_ROOT*1024] = "MFS Filesystem goes here";
89u_char end_mfs_root[] = "MFS Filesystem had better STOP here";
90#endif
91
92#include "eisa.h"
93#include "isa.h"
94#if NISA > 0
95      #include <i386/isa/isa_device.h>
96#endif
97
98#include "pci.h"
99#if NPCI > 0
100      #include <pci/pcivar.h>
101#endif
102
103#include "crd.h"
104#if NCRD > 0
105void	pccard_configure();
106#endif
107
108#ifdef CD9660
109/* We need to try out all our potential CDROM drives, so we need a table. */
110static struct {
111	char *name;
112	int major;
113} try_cdrom[] = {
114	{ "cd", 6 },
115	{ "mcd", 7 },
116	{ "scd", 16 },
117	{ "matcd", 17 },
118	{ 0, 0}
119};
120
121int
122find_cdrom_root()
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)();
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()
164{
165
166	configure_start();
167
168#if NEISA > 0
169	eisa_configure();
170#endif
171
172
173#if NISA > 0
174	isa_configure();
175#endif
176
177#if NPCI > 0
178	pci_configure();
179#endif
180
181#if NCRD > 0
182	pccard_configure();
183#endif
184
185	configure_finish();
186
187#ifdef MFS_ROOT
188	mfs_initminiroot(mfs_root);		/* XXX UGLY*/
189#endif /* MFS_ROOT */
190
191#ifdef CD9660
192	if ((boothowto & RB_CDROM) && !mountroot)
193		mountroot = find_cdrom_root;
194#endif
195
196#ifdef NFS
197	if (!mountroot && nfs_diskless_valid)
198		mountroot = nfs_mountroot;
199#endif /* NFS */
200
201#ifdef FFS
202	if (!mountroot) {
203		mountroot = vfs_mountroot;	/* XXX goes away*/
204		mountrootvfsops = &ufs_vfsops;
205		/*
206		 * Ignore the -a flag if this kernel isn't compiled
207		 * with a generic root/swap configuration: if we skip
208		 * setroot() and we aren't a generic kernel, chaos
209		 * will ensue because setconf() will be a no-op.
210		 * (rootdev is always initialized to NODEV in a
211		 * generic configuration, so we test for that.)
212		 */
213		if ((boothowto & RB_ASKNAME) == 0 || rootdev != NODEV)
214			setroot();
215	}
216#endif
217#ifdef LFS
218	if (!mountroot) {
219		mountroot = vfs_mountroot;	/* XXX goes away*/
220		mountrootvfsops = &lfs_vfsops;
221		/*
222		 * Ignore the -a flag if this kernel isn't compiled
223		 * with a generic root/swap configuration: if we skip
224		 * setroot() and we aren't a generic kernel, chaos
225		 * will ensue because setconf() will be a no-op.
226		 * (rootdev is always initialized to NODEV in a
227		 * generic configuration, so we test for that.)
228		 */
229		if ((boothowto & RB_ASKNAME) == 0 || rootdev != NODEV)
230			setroot();
231	}
232#endif
233	if (!mountroot) {
234		panic("Nobody wants to mount my root for me");
235	}
236	/*
237	 * Configure swap area and related system
238	 * parameter based on device(s) used.
239	 */
240	setconf();
241	cold = 0;
242}
243
244int
245setdumpdev(dev)
246	dev_t dev;
247{
248	int maj, psize;
249	long newdumplo;
250
251	if (dev == NODEV) {
252		dumpdev = dev;
253		dumplo = 0;
254		return (0);
255	}
256	maj = major(dev);
257	if (maj >= nblkdev)
258		return (ENXIO);
259	if (bdevsw[maj].d_psize == NULL)
260		return (ENXIO);		/* XXX should sometimes be ENODEV */
261	psize = bdevsw[maj].d_psize(dev);
262	if (psize == -1)
263		return (ENXIO);		/* XXX should sometimes be ENODEV */
264	newdumplo = psize - Maxmem * NBPG / DEV_BSIZE;
265	if (newdumplo < 0)
266		return (ENOSPC);
267	dumpdev = dev;
268	dumplo = newdumplo;
269	return (0);
270}
271
272u_long	bootdev = 0;		/* not a dev_t - encoding is different */
273
274static	char devname[][2] = {
275      {'w','d'},      /* 0 = wd */
276      {'s','w'},      /* 1 = sw */
277#define FDMAJOR 2
278      {'f','d'},      /* 2 = fd */
279      {'w','t'},      /* 3 = wt */
280      {'s','d'},      /* 4 = sd -- new SCSI system */
281};
282
283#define	PARTITIONMASK	0x7
284#define	PARTITIONSHIFT	3
285#define FDUNITSHIFT     6
286#define RAW_PART        2
287
288/*
289 * Attempt to find the device from which we were booted.
290 * If we can do so, and not instructed not to do so,
291 * change rootdev to correspond to the load device.
292 */
293static void
294setroot()
295{
296	int  majdev, mindev, unit, part, adaptor;
297	dev_t temp = 0, orootdev;
298	struct swdevt *swp;
299
300/*printf("howto %x bootdev %x ", boothowto, bootdev);*/
301	if (boothowto & RB_DFLTROOT ||
302	    (bootdev & B_MAGICMASK) != (u_long)B_DEVMAGIC)
303		return;
304	majdev = (bootdev >> B_TYPESHIFT) & B_TYPEMASK;
305	if (majdev > sizeof(devname) / sizeof(devname[0]))
306		return;
307	adaptor = (bootdev >> B_ADAPTORSHIFT) & B_ADAPTORMASK;
308	unit = (bootdev >> B_UNITSHIFT) & B_UNITMASK;
309	if (majdev == FDMAJOR) {
310		part = RAW_PART;
311		mindev = unit << FDUNITSHIFT;
312	}
313	else {
314		part = (bootdev >> B_PARTITIONSHIFT) & B_PARTITIONMASK;
315		mindev = (unit << PARTITIONSHIFT) + part;
316	}
317	orootdev = rootdev;
318	rootdev = makedev(majdev, mindev);
319	/*
320	 * If the original rootdev is the same as the one
321	 * just calculated, don't need to adjust the swap configuration.
322	 */
323	if (rootdev == orootdev)
324		return;
325	printf("changing root device to %c%c%d%c\n",
326		devname[majdev][0], devname[majdev][1],
327		mindev >> (majdev == FDMAJOR ? FDUNITSHIFT : PARTITIONSHIFT),
328		part + 'a');
329}
330