aboutsummaryrefslogtreecommitdiff
path: root/sys/amd64/amd64/autoconf.c
blob: 84b0cce804733e8416cd306dcfda7891fa1df3cf (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * William Jolitz.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)autoconf.c	7.1 (Berkeley) 5/9/91
 *
 * PATCHES MAGIC                LEVEL   PATCH THAT GOT US HERE
 * --------------------         -----   ----------------------
 * CURRENT PATCH LEVEL:         1       00117
 * --------------------         -----   ----------------------
 *
 * 09 Apr 93	???(From sun-lamp)	Fix to report sd when Julians
 *					scsi code is used, allow you to swap
 *					root floppies during a boot
 */
static char rcsid[] = "$Header: /freefall/a/cvs/386BSD/src/sys/i386/i386/autoconf.c,v 1.2 1993/08/08 06:24:15 rgrimes Exp $";

/*
 * Setup the system to run on the current machine.
 *
 * Configure() is called at boot time and initializes the vba 
 * device tables and the memory controller monitoring.  Available
 * devices are determined (from possibilities mentioned in ioconf.c),
 * and the drivers are initialized.
 */
#include "param.h"
#include "systm.h"
#include "buf.h"
#include "dkstat.h"
#include "conf.h"
#include "dmap.h"
#include "reboot.h"

#include "machine/pte.h"

/*
 * The following several variables are related to
 * the configuration process, and are used in initializing
 * the machine.
 */
int	dkn;		/* number of iostat dk numbers assigned so far */
extern int	cold;		/* cold start flag initialized in locore.s */

/*
 * Determine i/o configuration for a machine.
 */
configure()
{

#include "isa.h"
#if NISA > 0
	isa_configure();
#endif

#if GENERICxxx
	if ((boothowto & RB_ASKNAME) == 0)
		setroot();
	setconf();
#else
	setroot();
#endif
	/*
	 * Configure swap area and related system
	 * parameter based on device(s) used.
	 */
	swapconf();
	cold = 0;
}

/*
 * Configure swap space and related parameters.
 */
swapconf()
{
	register struct swdevt *swp;
	register int nblks;
extern int Maxmem;

	for (swp = swdevt; swp->sw_dev > 0; swp++)
	{
		unsigned d = major(swp->sw_dev);

		if (d > nblkdev) break;
		if (bdevsw[d].d_psize) {
			nblks = (*bdevsw[d].d_psize)(swp->sw_dev);
			if (nblks > 0 &&
			    (swp->sw_nblks == 0 || swp->sw_nblks > nblks))
				swp->sw_nblks = nblks;
			else
				swp->sw_nblks = 0;
		}
		swp->sw_nblks = ctod(dtoc(swp->sw_nblks));
	}
	if (dumplo == 0 && bdevsw[major(dumpdev)].d_psize)
	/*dumplo = (*bdevsw[major(dumpdev)].d_psize)(dumpdev) - physmem;*/
		dumplo = (*bdevsw[major(dumpdev)].d_psize)(dumpdev) -
			Maxmem*NBPG/512;
	if (dumplo < 0)
		dumplo = 0;
}

#define	DOSWAP			/* change swdevt and dumpdev */
u_long	bootdev = 0;		/* should be dev_t, but not until 32 bits */

static	char devname[][2] = {
	'w','d',	/* 0 = wd */
	's','w',	/* 1 = sw */
	'f','d',	/* 2 = fd */
	'w','t',	/* 3 = wt */
	's','d',	/* 4 = sd -- new SCSI system */
};

#define	PARTITIONMASK	0x7
#define	PARTITIONSHIFT	3

/*
 * Attempt to find the device from which we were booted.
 * If we can do so, and not instructed not to do so,
 * change rootdev to correspond to the load device.
 */
setroot()
{
	int  majdev, mindev, unit, part, adaptor;
	dev_t temp, orootdev;
	struct swdevt *swp;

/*printf("howto %x bootdev %x ", boothowto, bootdev);*/
	if (boothowto & RB_DFLTROOT ||
	    (bootdev & B_MAGICMASK) != (u_long)B_DEVMAGIC)
		return;
	majdev = (bootdev >> B_TYPESHIFT) & B_TYPEMASK;
	if (majdev > sizeof(devname) / sizeof(devname[0]))
		return;
	adaptor = (bootdev >> B_ADAPTORSHIFT) & B_ADAPTORMASK;
	part = (bootdev >> B_PARTITIONSHIFT) & B_PARTITIONMASK;
	unit = (bootdev >> B_UNITSHIFT) & B_UNITMASK;
	mindev = (unit << PARTITIONSHIFT) + part;
	orootdev = rootdev;
	rootdev = makedev(majdev, mindev);
	/*
	 * If the original rootdev is the same as the one
	 * just calculated, don't need to adjust the swap configuration.
	 */
	if (rootdev == orootdev)
		return;
	printf("changing root device to %c%c%d%c\n",
		devname[majdev][0], devname[majdev][1],
		mindev >> PARTITIONSHIFT, part + 'a');
#ifdef DOSWAP
	mindev &= ~PARTITIONMASK;
	for (swp = swdevt; swp->sw_dev; swp++) {
		if (majdev == major(swp->sw_dev) &&
		    mindev == (minor(swp->sw_dev) & ~PARTITIONMASK)) {

			temp = swdevt[0].sw_dev;
			swdevt[0].sw_dev = swp->sw_dev;
			swp->sw_dev = temp;
			break;
		}
	}
	if (swp->sw_dev == 0)
		return;
	/*
	 * If dumpdev was the same as the old primary swap
	 * device, move it to the new primary swap device.
	 */
	if (temp == dumpdev)
		dumpdev = swdevt[0].sw_dev;
#endif
}