2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
31 * MD bootstrap main() and assorted miscellaneous
38 #include <machine/bootinfo.h>
39 #include <machine/cpufunc.h>
40 #include <machine/psl.h>
41 #include <sys/reboot.h>
43 #include "bootstrap.h"
44 #include "common/bootargs.h"
45 #include "libi386/libi386.h"
48 #ifdef LOADER_ZFS_SUPPORT
49 #include "../zfs/libzfs.h"
52 CTASSERT(sizeof(struct bootargs) == BOOTARGS_SIZE);
53 CTASSERT(offsetof(struct bootargs, bootinfo) == BA_BOOTINFO);
54 CTASSERT(offsetof(struct bootargs, bootflags) == BA_BOOTFLAGS);
55 CTASSERT(offsetof(struct bootinfo, bi_size) == BI_SIZE);
57 /* Arguments passed in from the boot1/boot2 loader */
58 static struct bootargs *kargs;
60 static u_int32_t initial_howto;
61 static u_int32_t initial_bootdev;
62 static struct bootinfo *initial_bootinfo;
64 struct arch_switch archsw; /* MI/MD interface boundary */
66 static void extract_currdev(void);
67 static int isa_inb(int port);
68 static void isa_outb(int port, int value);
70 #ifdef LOADER_ZFS_SUPPORT
71 static void i386_zfs_probe(void);
75 extern char bootprog_name[], bootprog_rev[], bootprog_date[], bootprog_maker[];
80 static void *heap_top;
81 static void *heap_bottom;
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;
94 /* Initialize the v86 register set to a known-good state. */
95 bzero(&v86, sizeof(v86));
96 v86.efl = PSL_RESERVED_DEFAULT | PSL_I;
99 * Initialise the heap as early as possible. Once this is done, malloc() is usable.
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;
113 heap_top = (void *)PTOV(bios_basemem);
114 heap_bottom = (void *)end;
116 setheap(heap_bottom, heap_top);
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
123 * We can use printf() etc. once this is done.
124 * If the previous boot stage has requested a serial console, prefer that.
126 bi_setboothowto(initial_howto);
127 if (initial_howto & RB_MULTIPLE) {
128 if (initial_howto & RB_SERIAL)
129 setenv("console", "comconsole vidconsole", 1);
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);
139 * Initialise the block cache
141 bcache_init(32, 512); /* 16k cache XXX tune this */
144 * Special handling for PXE and CD booting.
146 if (kargs->bootinfo == 0) {
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.
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);
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;
169 * March through the device switch probing for things.
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;
180 /* detect ACPI for future reference */
183 /* detect SMBIOS for future reference */
187 printf("%s, Revision %s\n", bootprog_name, bootprog_rev);
188 printf("(%s, %s)\n", bootprog_maker, bootprog_date);
190 extract_currdev(); /* set $currdev and $loaddev */
191 setenv("LINES", "24", 1); /* optional */
195 interact(); /* doesn't return */
197 /* if we ever get here, it is an error */
202 * Set the 'current device' by (if possible) recovering the boot device as
203 * supplied by the initial bootstrap.
205 * XXX should be extended for netbooting.
208 extract_currdev(void)
210 struct i386_devdesc new_currdev;
211 #ifdef LOADER_ZFS_SUPPORT
213 struct zfs_boot_args *zargs;
217 /* Assume we are booting from a BIOS disk by default */
218 new_currdev.d_dev = &biosdisk;
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;
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;
236 #ifdef LOADER_ZFS_SUPPORT
237 } else if ((kargs->bootflags & KARGS_FLAGS_ZFS) != 0) {
239 /* check for new style extended argument */
240 if ((kargs->bootflags & KARGS_FLAGS_EXTARG) != 0)
241 zargs = (struct zfs_boot_args *)(kargs + 1);
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);
255 /* old style zfsboot block */
256 new_currdev.d_kind.zfs.pool_guid = kargs->zfspool;
257 new_currdev.d_kind.zfs.root_guid = 0;
259 new_currdev.d_dev = &zfs_dev;
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;
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;
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).
277 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) /* biosdev doesn't match major */
278 biosdev = 0x80 + B_UNIT(initial_bootdev); /* assume harddisk */
280 new_currdev.d_type = new_currdev.d_dev->dv_type;
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.
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;
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,
299 COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot);
302 command_reboot(int argc, char *argv[])
306 for (i = 0; devsw[i] != NULL; ++i)
307 if (devsw[i]->dv_cleanup != NULL)
308 (devsw[i]->dv_cleanup)();
310 printf("Rebooting...\n");
315 /* provide this for panic, as it's not in the startup code */
322 COMMAND_SET(heap, "heap", "show heap usage", command_heap);
325 command_heap(int argc, char *argv[])
328 printf("heap base at %p, top at %p, upper limit at %p\n", heap_bottom,
333 #ifdef LOADER_ZFS_SUPPORT
334 COMMAND_SET(lszfs, "lszfs", "list child datasets of a zfs dataset",
338 command_lszfs(int argc, char *argv[])
343 command_errmsg = "wrong number of arguments";
347 err = zfs_list(argv[1]);
349 command_errmsg = strerror(err);
356 /* ISA bus access functions for PnP. */
365 isa_outb(int port, int value)
371 #ifdef LOADER_ZFS_SUPPORT
379 * Open all the disks we can find and see if we can reconstruct
380 * ZFS pools from them.
382 for (unit = 0; unit < MAXBDDEV; unit++) {
383 if (bd_unit2bios(unit) == -1)
385 sprintf(devname, "disk%d:", unit);
386 zfs_probe_dev(devname, NULL);