main.c revision 56693 
1/*-
2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: head/sys/boot/i386/loader/main.c 56693 2000-01-27 21:21:01Z jhb $
27 */
28
29/*
30 * MD bootstrap main() and assorted miscellaneous
31 * commands.
32 */
33
34#include <stand.h>
35#include <string.h>
36#include <machine/bootinfo.h>
37#include <sys/reboot.h>
38
39#include "bootstrap.h"
40#include "libi386/libi386.h"
41#include "btxv86.h"
42
43#define	KARGS_FLAGS_CD		0x1
44
45/* Arguments passed in from the boot1/boot2 loader */
46static struct
47{
48    u_int32_t	howto;
49    u_int32_t	bootdev;
50    u_int32_t	bootflags;
51    u_int32_t	res1;
52    u_int32_t	res2;
53    u_int32_t	bootinfo;
54} *kargs;
55
56static u_int32_t	initial_howto;
57static u_int32_t	initial_bootdev;
58static struct bootinfo	*initial_bootinfo;
59
60struct arch_switch	archsw;		/* MI/MD interface boundary */
61
62static void		extract_currdev(void);
63static int		isa_inb(int port);
64static void		isa_outb(int port, int value);
65
66/* from vers.c */
67extern	char bootprog_name[], bootprog_rev[], bootprog_date[], bootprog_maker[];
68
69/* XXX debugging */
70extern char end[];
71
72void
73main(void)
74{
75    int			i;
76
77    /* Pick up arguments */
78    kargs = (void *)__args;
79    initial_howto = kargs->howto;
80    initial_bootdev = kargs->bootdev;
81    initial_bootinfo = (struct bootinfo *)PTOV(kargs->bootinfo);
82
83    /*
84     * Initialise the heap as early as possible.  Once this is done, malloc() is usable.
85     */
86    bios_getmem();
87    setheap((void *)end, (void *)bios_basemem);
88
89    /*
90     * XXX Chicken-and-egg problem; we want to have console output early, but some
91     * console attributes may depend on reading from eg. the boot device, which we
92     * can't do yet.
93     *
94     * We can use printf() etc. once this is done.
95     * If the previous boot stage has requested a serial console, prefer that.
96     */
97    if (initial_howto & RB_SERIAL)
98	setenv("console", "comconsole", 1);
99    cons_probe();
100
101    /*
102     * Initialise the block cache
103     */
104    bcache_init(32, 512);	/* 16k cache XXX tune this */
105
106    /*
107     * March through the device switch probing for things.
108     */
109    for (i = 0; devsw[i] != NULL; i++)
110	if (devsw[i]->dv_init != NULL)
111	    (devsw[i]->dv_init)();
112    printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024);
113
114    printf("\n");
115    printf("%s, Revision %s\n", bootprog_name, bootprog_rev);
116    printf("(%s, %s)\n", bootprog_maker, bootprog_date);
117
118    extract_currdev();				/* set $currdev and $loaddev */
119    setenv("LINES", "24", 1);			/* optional */
120
121    archsw.arch_autoload = i386_autoload;
122    archsw.arch_getdev = i386_getdev;
123    archsw.arch_copyin = i386_copyin;
124    archsw.arch_copyout = i386_copyout;
125    archsw.arch_readin = i386_readin;
126    archsw.arch_isainb = isa_inb;
127    archsw.arch_isaoutb = isa_outb;
128
129    interact();			/* doesn't return */
130}
131
132/*
133 * Set the 'current device' by (if possible) recovering the boot device as
134 * supplied by the initial bootstrap.
135 *
136 * XXX should be extended for netbooting.
137 */
138static void
139extract_currdev(void)
140{
141    struct i386_devdesc	currdev;
142    int			major, biosdev;
143
144    /* We're booting from a BIOS disk, try to spiff this */
145    currdev.d_dev = devsw[0];				/* XXX presumes that biosdisk is first in devsw */
146    currdev.d_type = currdev.d_dev->dv_type;
147
148    if ((kargs->bootinfo == NULL) && ((kargs->bootflags & KARGS_FLAGS_CD) != 0)) {
149	/* we are booting from a CD with cdldr */
150	currdev.d_kind.biosdisk.slice = -1;
151	currdev.d_kind.biosdisk.partition = 0;
152	biosdev = initial_bootdev;
153    } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) {
154	/* The passed-in boot device is bad */
155	currdev.d_kind.biosdisk.slice = -1;
156	currdev.d_kind.biosdisk.partition = 0;
157	biosdev = -1;
158    } else {
159	currdev.d_kind.biosdisk.slice = (B_ADAPTOR(initial_bootdev) << 4) + B_CONTROLLER(initial_bootdev) - 1;
160	currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev);
161	biosdev = initial_bootinfo->bi_bios_dev;
162	major = B_TYPE(initial_bootdev);
163
164	/*
165	 * If we are booted by an old bootstrap, we have to guess at the BIOS
166	 * unit number.  We will loose if there is more than one disk type
167	 * and we are not booting from the lowest-numbered disk type
168	 * (ie. SCSI when IDE also exists).
169	 */
170	if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2))	/* biosdev doesn't match major */
171	    biosdev = 0x80 + B_UNIT(initial_bootdev);		/* assume harddisk */
172    }
173
174    if ((currdev.d_kind.biosdisk.unit = bd_bios2unit(biosdev)) == -1) {
175	printf("Can't work out which disk we are booting from.\n"
176	       "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev);
177	currdev.d_kind.biosdisk.unit = 0;
178    }
179    env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&currdev), i386_setcurrdev, env_nounset);
180    env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&currdev), env_noset, env_nounset);
181}
182
183COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot);
184
185static int
186command_reboot(int argc, char *argv[])
187{
188
189    printf("Rebooting...\n");
190    delay(1000000);
191    __exit(0);
192}
193
194/* provide this for panic, as it's not in the startup code */
195void
196exit(int code)
197{
198    __exit(code);
199}
200
201COMMAND_SET(heap, "heap", "show heap usage", command_heap);
202
203static int
204command_heap(int argc, char *argv[])
205{
206    mallocstats();
207    printf("heap base at %p, top at %p\n", end, sbrk(0));
208    return(CMD_OK);
209}
210
211/* ISA bus access functions for PnP, derived from <machine/cpufunc.h> */
212static int
213isa_inb(int port)
214{
215    u_char	data;
216
217    if (__builtin_constant_p(port) &&
218	(((port) & 0xffff) < 0x100) &&
219	((port) < 0x10000)) {
220	__asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port)));
221    } else {
222	__asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
223    }
224    return(data);
225}
226
227static void
228isa_outb(int port, int value)
229{
230    u_char	al = value;
231
232    if (__builtin_constant_p(port) &&
233	(((port) & 0xffff) < 0x100) &&
234	((port) < 0x10000)) {
235	__asm __volatile("outb %0,%1" : : "a" (al), "id" ((u_short)(port)));
236    } else {
237        __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));
238    }
239}
240
241