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
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD$");
29
30/*
31 * MD bootstrap main() and assorted miscellaneous
32 * commands.
33 */
34
35#include <stand.h>
36#include <stddef.h>
37#include <string.h>
38#include <machine/bootinfo.h>
39#include <machine/cpufunc.h>
40#include <machine/psl.h>
41#include <sys/reboot.h>
42
43#include "bootstrap.h"
44#include "common/bootargs.h"
45#include "libi386/libi386.h"
46#include "btxv86.h"
47
48#ifdef LOADER_ZFS_SUPPORT
49#include "../zfs/libzfs.h"
50#endif
51
52CTASSERT(sizeof(struct bootargs) == BOOTARGS_SIZE);
53CTASSERT(offsetof(struct bootargs, bootinfo) == BA_BOOTINFO);
54CTASSERT(offsetof(struct bootargs, bootflags) == BA_BOOTFLAGS);
55CTASSERT(offsetof(struct bootinfo, bi_size) == BI_SIZE);
56
57/* Arguments passed in from the boot1/boot2 loader */
58static struct bootargs *kargs;
59
60static u_int32_t	initial_howto;
61static u_int32_t	initial_bootdev;
62static struct bootinfo	*initial_bootinfo;
63
64struct arch_switch	archsw;		/* MI/MD interface boundary */
65
66static void		extract_currdev(void);
67static int		isa_inb(int port);
68static void		isa_outb(int port, int value);
69void			exit(int code);
70#ifdef LOADER_ZFS_SUPPORT
71static void		i386_zfs_probe(void);
72#endif
73
74/* from vers.c */
75extern	char bootprog_name[], bootprog_rev[], bootprog_date[], bootprog_maker[];
76
77/* XXX debugging */
78extern char end[];
79
80static void *heap_top;
81static void *heap_bottom;
82
83int
84main(void)
85{
86    int			i;
87
88    /* Pick up arguments */
89    kargs = (void *)__args;
90    initial_howto = kargs->howto;
91    initial_bootdev = kargs->bootdev;
92    initial_bootinfo = kargs->bootinfo ? (struct bootinfo *)PTOV(kargs->bootinfo) : NULL;
93
94    /* Initialize the v86 register set to a known-good state. */
95    bzero(&v86, sizeof(v86));
96    v86.efl = PSL_RESERVED_DEFAULT | PSL_I;
97
98    /*
99     * Initialise the heap as early as possible.  Once this is done, malloc() is usable.
100     */
101    bios_getmem();
102
103#if defined(LOADER_BZIP2_SUPPORT) || defined(LOADER_FIREWIRE_SUPPORT) || \
104    defined(LOADER_GPT_SUPPORT) || defined(LOADER_ZFS_SUPPORT)
105    if (high_heap_size > 0) {
106	heap_top = PTOV(high_heap_base + high_heap_size);
107	heap_bottom = PTOV(high_heap_base);
108	if (high_heap_base < memtop_copyin)
109	    memtop_copyin = high_heap_base;
110    } else
111#endif
112    {
113	heap_top = (void *)PTOV(bios_basemem);
114	heap_bottom = (void *)end;
115    }
116    setheap(heap_bottom, heap_top);
117
118    /*
119     * XXX Chicken-and-egg problem; we want to have console output early, but some
120     * console attributes may depend on reading from eg. the boot device, which we
121     * can't do yet.
122     *
123     * We can use printf() etc. once this is done.
124     * If the previous boot stage has requested a serial console, prefer that.
125     */
126    bi_setboothowto(initial_howto);
127    if (initial_howto & RB_MULTIPLE) {
128	if (initial_howto & RB_SERIAL)
129	    setenv("console", "comconsole vidconsole", 1);
130	else
131	    setenv("console", "vidconsole comconsole", 1);
132    } else if (initial_howto & RB_SERIAL)
133	setenv("console", "comconsole", 1);
134    else if (initial_howto & RB_MUTE)
135	setenv("console", "nullconsole", 1);
136    cons_probe();
137
138    /*
139     * Initialise the block cache
140     */
141    bcache_init(32, 512);	/* 16k cache XXX tune this */
142
143    /*
144     * Special handling for PXE and CD booting.
145     */
146    if (kargs->bootinfo == 0) {
147	/*
148	 * We only want the PXE disk to try to init itself in the below
149	 * walk through devsw if we actually booted off of PXE.
150	 */
151	if (kargs->bootflags & KARGS_FLAGS_PXE)
152	    pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL);
153	else if (kargs->bootflags & KARGS_FLAGS_CD)
154	    bc_add(initial_bootdev);
155    }
156
157    archsw.arch_autoload = i386_autoload;
158    archsw.arch_getdev = i386_getdev;
159    archsw.arch_copyin = i386_copyin;
160    archsw.arch_copyout = i386_copyout;
161    archsw.arch_readin = i386_readin;
162    archsw.arch_isainb = isa_inb;
163    archsw.arch_isaoutb = isa_outb;
164#ifdef LOADER_ZFS_SUPPORT
165    archsw.arch_zfs_probe = i386_zfs_probe;
166#endif
167
168    /*
169     * March through the device switch probing for things.
170     */
171    for (i = 0; devsw[i] != NULL; i++)
172	if (devsw[i]->dv_init != NULL)
173	    (devsw[i]->dv_init)();
174    printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024);
175    if (initial_bootinfo != NULL) {
176	initial_bootinfo->bi_basemem = bios_basemem / 1024;
177	initial_bootinfo->bi_extmem = bios_extmem / 1024;
178    }
179
180    /* detect ACPI for future reference */
181    biosacpi_detect();
182
183    /* detect SMBIOS for future reference */
184    smbios_detect();
185
186    printf("\n");
187    printf("%s, Revision %s\n", bootprog_name, bootprog_rev);
188    printf("(%s, %s)\n", bootprog_maker, bootprog_date);
189
190    extract_currdev();				/* set $currdev and $loaddev */
191    setenv("LINES", "24", 1);			/* optional */
192
193    bios_getsmap();
194
195    interact();			/* doesn't return */
196
197    /* if we ever get here, it is an error */
198    return (1);
199}
200
201/*
202 * Set the 'current device' by (if possible) recovering the boot device as
203 * supplied by the initial bootstrap.
204 *
205 * XXX should be extended for netbooting.
206 */
207static void
208extract_currdev(void)
209{
210    struct i386_devdesc		new_currdev;
211#ifdef LOADER_ZFS_SUPPORT
212    char			buf[20];
213    struct zfs_boot_args	*zargs;
214#endif
215    int				biosdev = -1;
216
217    /* Assume we are booting from a BIOS disk by default */
218    new_currdev.d_dev = &biosdisk;
219
220    /* new-style boot loaders such as pxeldr and cdldr */
221    if (kargs->bootinfo == 0) {
222        if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) {
223	    /* we are booting from a CD with cdboot */
224	    new_currdev.d_dev = &bioscd;
225	    new_currdev.d_unit = bc_bios2unit(initial_bootdev);
226	} else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) {
227	    /* we are booting from pxeldr */
228	    new_currdev.d_dev = &pxedisk;
229	    new_currdev.d_unit = 0;
230	} else {
231	    /* we don't know what our boot device is */
232	    new_currdev.d_kind.biosdisk.slice = -1;
233	    new_currdev.d_kind.biosdisk.partition = 0;
234	    biosdev = -1;
235	}
236#ifdef LOADER_ZFS_SUPPORT
237    } else if ((kargs->bootflags & KARGS_FLAGS_ZFS) != 0) {
238	zargs = NULL;
239	/* check for new style extended argument */
240	if ((kargs->bootflags & KARGS_FLAGS_EXTARG) != 0)
241	    zargs = (struct zfs_boot_args *)(kargs + 1);
242
243	if (zargs != NULL &&
244	    zargs->size >= offsetof(struct zfs_boot_args, primary_pool)) {
245	    /* sufficient data is provided */
246	    new_currdev.d_kind.zfs.pool_guid = zargs->pool;
247	    new_currdev.d_kind.zfs.root_guid = zargs->root;
248	    if (zargs->size >= sizeof(*zargs) && zargs->primary_vdev != 0) {
249		sprintf(buf, "%llu", zargs->primary_pool);
250		setenv("vfs.zfs.boot.primary_pool", buf, 1);
251		sprintf(buf, "%llu", zargs->primary_vdev);
252		setenv("vfs.zfs.boot.primary_vdev", buf, 1);
253	    }
254	} else {
255	    /* old style zfsboot block */
256	    new_currdev.d_kind.zfs.pool_guid = kargs->zfspool;
257	    new_currdev.d_kind.zfs.root_guid = 0;
258	}
259	new_currdev.d_dev = &zfs_dev;
260#endif
261    } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) {
262	/* The passed-in boot device is bad */
263	new_currdev.d_kind.biosdisk.slice = -1;
264	new_currdev.d_kind.biosdisk.partition = 0;
265	biosdev = -1;
266    } else {
267	new_currdev.d_kind.biosdisk.slice = B_SLICE(initial_bootdev) - 1;
268	new_currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev);
269	biosdev = initial_bootinfo->bi_bios_dev;
270
271	/*
272	 * If we are booted by an old bootstrap, we have to guess at the BIOS
273	 * unit number.  We will lose if there is more than one disk type
274	 * and we are not booting from the lowest-numbered disk type
275	 * (ie. SCSI when IDE also exists).
276	 */
277	if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2))	/* biosdev doesn't match major */
278	    biosdev = 0x80 + B_UNIT(initial_bootdev);		/* assume harddisk */
279    }
280    new_currdev.d_type = new_currdev.d_dev->dv_type;
281
282    /*
283     * If we are booting off of a BIOS disk and we didn't succeed in determining
284     * which one we booted off of, just use disk0: as a reasonable default.
285     */
286    if ((new_currdev.d_type == biosdisk.dv_type) &&
287	((new_currdev.d_unit = bd_bios2unit(biosdev)) == -1)) {
288	printf("Can't work out which disk we are booting from.\n"
289	       "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev);
290	new_currdev.d_unit = 0;
291    }
292
293    env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev),
294	       i386_setcurrdev, env_nounset);
295    env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), env_noset,
296	       env_nounset);
297}
298
299COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot);
300
301static int
302command_reboot(int argc, char *argv[])
303{
304    int i;
305
306    for (i = 0; devsw[i] != NULL; ++i)
307	if (devsw[i]->dv_cleanup != NULL)
308	    (devsw[i]->dv_cleanup)();
309
310    printf("Rebooting...\n");
311    delay(1000000);
312    __exit(0);
313}
314
315/* provide this for panic, as it's not in the startup code */
316void
317exit(int code)
318{
319    __exit(code);
320}
321
322COMMAND_SET(heap, "heap", "show heap usage", command_heap);
323
324static int
325command_heap(int argc, char *argv[])
326{
327    mallocstats();
328    printf("heap base at %p, top at %p, upper limit at %p\n", heap_bottom,
329      sbrk(0), heap_top);
330    return(CMD_OK);
331}
332
333#ifdef LOADER_ZFS_SUPPORT
334COMMAND_SET(lszfs, "lszfs", "list child datasets of a zfs dataset",
335    command_lszfs);
336
337static int
338command_lszfs(int argc, char *argv[])
339{
340    int err;
341
342    if (argc != 2) {
343	command_errmsg = "wrong number of arguments";
344	return (CMD_ERROR);
345    }
346
347    err = zfs_list(argv[1]);
348    if (err != 0) {
349	command_errmsg = strerror(err);
350	return (CMD_ERROR);
351    }
352    return (CMD_OK);
353}
354#endif
355
356/* ISA bus access functions for PnP. */
357static int
358isa_inb(int port)
359{
360
361    return (inb(port));
362}
363
364static void
365isa_outb(int port, int value)
366{
367
368    outb(port, value);
369}
370
371#ifdef LOADER_ZFS_SUPPORT
372static void
373i386_zfs_probe(void)
374{
375    char devname[32];
376    int unit;
377
378    /*
379     * Open all the disks we can find and see if we can reconstruct
380     * ZFS pools from them.
381     */
382    for (unit = 0; unit < MAXBDDEV; unit++) {
383	if (bd_unit2bios(unit) == -1)
384	    break;
385	sprintf(devname, "disk%d:", unit);
386	zfs_probe_dev(devname, NULL);
387    }
388}
389#endif
390