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>
42 #include <sys/reboot.h>
43 #include <common/drv.h>
45 #include "bootstrap.h"
46 #include "common/bootargs.h"
47 #include "libi386/libi386.h"
48 #include "libi386/smbios.h"
51 #ifdef LOADER_ZFS_SUPPORT
55 CTASSERT(sizeof(struct bootargs) == BOOTARGS_SIZE);
56 CTASSERT(offsetof(struct bootargs, bootinfo) == BA_BOOTINFO);
57 CTASSERT(offsetof(struct bootargs, bootflags) == BA_BOOTFLAGS);
58 CTASSERT(offsetof(struct bootinfo, bi_size) == BI_SIZE);
60 /* Arguments passed in from the boot1/boot2 loader */
61 static struct bootargs *kargs;
63 static uint32_t initial_howto;
64 static uint32_t initial_bootdev;
65 static struct bootinfo *initial_bootinfo;
67 struct arch_switch archsw; /* MI/MD interface boundary */
69 static void extract_currdev(void);
70 static int isa_inb(int port);
71 static void isa_outb(int port, int value);
73 #ifdef LOADER_GELI_SUPPORT
75 struct geli_boot_args *gargs;
77 #ifdef LOADER_ZFS_SUPPORT
78 struct zfs_boot_args *zargs;
79 static void i386_zfs_probe(void);
85 static void *heap_top;
86 static void *heap_bottom;
93 /* Pick up arguments */
94 kargs = (void *)__args;
95 initial_howto = kargs->howto;
96 initial_bootdev = kargs->bootdev;
97 initial_bootinfo = kargs->bootinfo ? (struct bootinfo *)PTOV(kargs->bootinfo) : NULL;
99 /* Initialize the v86 register set to a known-good state. */
100 bzero(&v86, sizeof(v86));
101 v86.efl = PSL_RESERVED_DEFAULT | PSL_I;
104 * Initialise the heap as early as possible. Once this is done, malloc() is usable.
108 #if defined(LOADER_BZIP2_SUPPORT) || defined(LOADER_FIREWIRE_SUPPORT) || \
109 defined(LOADER_GPT_SUPPORT) || defined(LOADER_ZFS_SUPPORT)
110 if (high_heap_size > 0) {
111 heap_top = PTOV(high_heap_base + high_heap_size);
112 heap_bottom = PTOV(high_heap_base);
113 if (high_heap_base < memtop_copyin)
114 memtop_copyin = high_heap_base;
118 heap_top = (void *)PTOV(bios_basemem);
119 heap_bottom = (void *)end;
121 setheap(heap_bottom, heap_top);
124 * XXX Chicken-and-egg problem; we want to have console output early, but some
125 * console attributes may depend on reading from eg. the boot device, which we
128 * We can use printf() etc. once this is done.
129 * If the previous boot stage has requested a serial console, prefer that.
131 bi_setboothowto(initial_howto);
132 if (initial_howto & RB_MULTIPLE) {
133 if (initial_howto & RB_SERIAL)
134 setenv("console", "comconsole vidconsole", 1);
136 setenv("console", "vidconsole comconsole", 1);
137 } else if (initial_howto & RB_SERIAL)
138 setenv("console", "comconsole", 1);
139 else if (initial_howto & RB_MUTE)
140 setenv("console", "nullconsole", 1);
144 * Initialise the block cache. Set the upper limit.
146 bcache_init(32768, 512);
149 * Special handling for PXE and CD booting.
151 if (kargs->bootinfo == 0) {
153 * We only want the PXE disk to try to init itself in the below
154 * walk through devsw if we actually booted off of PXE.
156 if (kargs->bootflags & KARGS_FLAGS_PXE)
157 pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL);
158 else if (kargs->bootflags & KARGS_FLAGS_CD)
159 bc_add(initial_bootdev);
162 archsw.arch_autoload = i386_autoload;
163 archsw.arch_getdev = i386_getdev;
164 archsw.arch_copyin = i386_copyin;
165 archsw.arch_copyout = i386_copyout;
166 archsw.arch_readin = i386_readin;
167 archsw.arch_isainb = isa_inb;
168 archsw.arch_isaoutb = isa_outb;
169 #ifdef LOADER_ZFS_SUPPORT
170 archsw.arch_zfs_probe = i386_zfs_probe;
172 #ifdef LOADER_GELI_SUPPORT
173 if ((kargs->bootflags & KARGS_FLAGS_EXTARG) != 0) {
174 zargs = (struct zfs_boot_args *)(kargs + 1);
175 if (zargs != NULL && zargs->size >= offsetof(struct zfs_boot_args, gelipw)) {
176 if (zargs->size >= offsetof(struct zfs_boot_args, keybuf_sentinel) &&
177 zargs->keybuf_sentinel == KEYBUF_SENTINEL) {
178 geli_import_key_buffer(zargs->keybuf);
180 if (zargs->gelipw[0] != '\0') {
181 setenv("kern.geom.eli.passphrase", zargs->gelipw, 1);
182 explicit_bzero(zargs->gelipw, sizeof(zargs->gelipw));
186 #endif /* LOADER_GELI_SUPPORT */
187 #else /* !LOADER_ZFS_SUPPORT */
188 #ifdef LOADER_GELI_SUPPORT
189 if ((kargs->bootflags & KARGS_FLAGS_EXTARG) != 0) {
190 gargs = (struct geli_boot_args *)(kargs + 1);
191 if (gargs != NULL && gargs->size >= offsetof(struct geli_boot_args, gelipw)) {
192 if (gargs->keybuf_sentinel == KEYBUF_SENTINEL) {
193 geli_import_key_buffer(gargs->keybuf);
195 if (gargs->gelipw[0] != '\0') {
196 setenv("kern.geom.eli.passphrase", gargs->gelipw, 1);
197 explicit_bzero(gargs->gelipw, sizeof(gargs->gelipw));
201 #endif /* LOADER_GELI_SUPPORT */
202 #endif /* LOADER_ZFS_SUPPORT */
205 * March through the device switch probing for things.
207 for (i = 0; devsw[i] != NULL; i++)
208 if (devsw[i]->dv_init != NULL)
209 (devsw[i]->dv_init)();
210 printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024);
211 if (initial_bootinfo != NULL) {
212 initial_bootinfo->bi_basemem = bios_basemem / 1024;
213 initial_bootinfo->bi_extmem = bios_extmem / 1024;
216 /* detect ACPI for future reference */
219 /* detect SMBIOS for future reference */
222 /* detect PCI BIOS for future reference */
225 printf("\n%s", bootprog_info);
227 extract_currdev(); /* set $currdev and $loaddev */
228 setenv("LINES", "24", 1); /* optional */
234 /* if we ever get here, it is an error */
239 * Set the 'current device' by (if possible) recovering the boot device as
240 * supplied by the initial bootstrap.
242 * XXX should be extended for netbooting.
245 extract_currdev(void)
247 struct i386_devdesc new_currdev;
248 #ifdef LOADER_ZFS_SUPPORT
253 /* Assume we are booting from a BIOS disk by default */
254 new_currdev.dd.d_dev = &bioshd;
256 /* new-style boot loaders such as pxeldr and cdldr */
257 if (kargs->bootinfo == 0) {
258 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) {
259 /* we are booting from a CD with cdboot */
260 new_currdev.dd.d_dev = &bioscd;
261 new_currdev.dd.d_unit = bd_bios2unit(initial_bootdev);
262 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) {
263 /* we are booting from pxeldr */
264 new_currdev.dd.d_dev = &pxedisk;
265 new_currdev.dd.d_unit = 0;
267 /* we don't know what our boot device is */
268 new_currdev.d_kind.biosdisk.slice = -1;
269 new_currdev.d_kind.biosdisk.partition = 0;
272 #ifdef LOADER_ZFS_SUPPORT
273 } else if ((kargs->bootflags & KARGS_FLAGS_ZFS) != 0) {
275 /* check for new style extended argument */
276 if ((kargs->bootflags & KARGS_FLAGS_EXTARG) != 0)
277 zargs = (struct zfs_boot_args *)(kargs + 1);
280 zargs->size >= offsetof(struct zfs_boot_args, primary_pool)) {
281 /* sufficient data is provided */
282 new_currdev.d_kind.zfs.pool_guid = zargs->pool;
283 new_currdev.d_kind.zfs.root_guid = zargs->root;
284 if (zargs->size >= sizeof(*zargs) && zargs->primary_vdev != 0) {
285 sprintf(buf, "%llu", zargs->primary_pool);
286 setenv("vfs.zfs.boot.primary_pool", buf, 1);
287 sprintf(buf, "%llu", zargs->primary_vdev);
288 setenv("vfs.zfs.boot.primary_vdev", buf, 1);
291 /* old style zfsboot block */
292 new_currdev.d_kind.zfs.pool_guid = kargs->zfspool;
293 new_currdev.d_kind.zfs.root_guid = 0;
295 new_currdev.dd.d_dev = &zfs_dev;
297 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) {
298 /* The passed-in boot device is bad */
299 new_currdev.d_kind.biosdisk.slice = -1;
300 new_currdev.d_kind.biosdisk.partition = 0;
303 new_currdev.d_kind.biosdisk.slice = B_SLICE(initial_bootdev) - 1;
304 new_currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev);
305 biosdev = initial_bootinfo->bi_bios_dev;
308 * If we are booted by an old bootstrap, we have to guess at the BIOS
309 * unit number. We will lose if there is more than one disk type
310 * and we are not booting from the lowest-numbered disk type
311 * (ie. SCSI when IDE also exists).
313 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) /* biosdev doesn't match major */
314 biosdev = 0x80 + B_UNIT(initial_bootdev); /* assume harddisk */
318 * If we are booting off of a BIOS disk and we didn't succeed in determining
319 * which one we booted off of, just use disk0: as a reasonable default.
321 if ((new_currdev.dd.d_dev->dv_type == bioshd.dv_type) &&
322 ((new_currdev.dd.d_unit = bd_bios2unit(biosdev)) == -1)) {
323 printf("Can't work out which disk we are booting from.\n"
324 "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev);
325 new_currdev.dd.d_unit = 0;
328 #ifdef LOADER_ZFS_SUPPORT
329 if (new_currdev.dd.d_dev->dv_type == DEVT_ZFS)
330 init_zfs_bootenv(zfs_fmtdev(&new_currdev));
333 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev),
334 i386_setcurrdev, env_nounset);
335 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), env_noset,
339 COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot);
342 command_reboot(int argc, char *argv[])
346 for (i = 0; devsw[i] != NULL; ++i)
347 if (devsw[i]->dv_cleanup != NULL)
348 (devsw[i]->dv_cleanup)();
350 printf("Rebooting...\n");
355 /* provide this for panic, as it's not in the startup code */
362 COMMAND_SET(heap, "heap", "show heap usage", command_heap);
365 command_heap(int argc, char *argv[])
368 printf("heap base at %p, top at %p, upper limit at %p\n", heap_bottom,
373 /* ISA bus access functions for PnP. */
382 isa_outb(int port, int value)
388 #ifdef LOADER_ZFS_SUPPORT
393 struct i386_devdesc dev;
396 * Open all the disks we can find and see if we can reconstruct
397 * ZFS pools from them.
399 dev.dd.d_dev = &bioshd;
400 for (dev.dd.d_unit = 0; bd_unit2bios(&dev) >= 0; dev.dd.d_unit++) {
401 snprintf(devname, sizeof(devname), "%s%d:", bioshd.dv_name,
403 zfs_probe_dev(devname, NULL);