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>
42 #include <common/drv.h>
44 #include "bootstrap.h"
45 #include "common/bootargs.h"
46 #include "libi386/libi386.h"
47 #include "libi386/smbios.h"
50 #ifdef LOADER_ZFS_SUPPORT
51 #include "../zfs/libzfs.h"
54 CTASSERT(sizeof(struct bootargs) == BOOTARGS_SIZE);
55 CTASSERT(offsetof(struct bootargs, bootinfo) == BA_BOOTINFO);
56 CTASSERT(offsetof(struct bootargs, bootflags) == BA_BOOTFLAGS);
57 CTASSERT(offsetof(struct bootinfo, bi_size) == BI_SIZE);
59 /* Arguments passed in from the boot1/boot2 loader */
60 static struct bootargs *kargs;
62 static u_int32_t initial_howto;
63 static u_int32_t initial_bootdev;
64 static struct bootinfo *initial_bootinfo;
66 struct arch_switch archsw; /* MI/MD interface boundary */
68 static void extract_currdev(void);
69 static int isa_inb(int port);
70 static void isa_outb(int port, int value);
72 #ifdef LOADER_GELI_SUPPORT
74 struct geli_boot_args *gargs;
76 #ifdef LOADER_ZFS_SUPPORT
77 struct zfs_boot_args *zargs;
78 static void i386_zfs_probe(void);
82 extern char bootprog_info[];
87 static void *heap_top;
88 static void *heap_bottom;
95 /* Pick up arguments */
96 kargs = (void *)__args;
97 initial_howto = kargs->howto;
98 initial_bootdev = kargs->bootdev;
99 initial_bootinfo = kargs->bootinfo ? (struct bootinfo *)PTOV(kargs->bootinfo) : NULL;
101 /* Initialize the v86 register set to a known-good state. */
102 bzero(&v86, sizeof(v86));
103 v86.efl = PSL_RESERVED_DEFAULT | PSL_I;
106 * Initialise the heap as early as possible. Once this is done, malloc() is usable.
110 #if defined(LOADER_BZIP2_SUPPORT) || defined(LOADER_FIREWIRE_SUPPORT) || \
111 defined(LOADER_GPT_SUPPORT) || defined(LOADER_ZFS_SUPPORT)
112 if (high_heap_size > 0) {
113 heap_top = PTOV(high_heap_base + high_heap_size);
114 heap_bottom = PTOV(high_heap_base);
115 if (high_heap_base < memtop_copyin)
116 memtop_copyin = high_heap_base;
120 heap_top = (void *)PTOV(bios_basemem);
121 heap_bottom = (void *)end;
123 setheap(heap_bottom, heap_top);
126 * XXX Chicken-and-egg problem; we want to have console output early, but some
127 * console attributes may depend on reading from eg. the boot device, which we
130 * We can use printf() etc. once this is done.
131 * If the previous boot stage has requested a serial console, prefer that.
133 bi_setboothowto(initial_howto);
134 if (initial_howto & RB_MULTIPLE) {
135 if (initial_howto & RB_SERIAL)
136 setenv("console", "comconsole vidconsole", 1);
138 setenv("console", "vidconsole comconsole", 1);
139 } else if (initial_howto & RB_SERIAL)
140 setenv("console", "comconsole", 1);
141 else if (initial_howto & RB_MUTE)
142 setenv("console", "nullconsole", 1);
146 * Initialise the block cache. Set the upper limit.
148 bcache_init(32768, 512);
151 * Special handling for PXE and CD booting.
153 if (kargs->bootinfo == 0) {
155 * We only want the PXE disk to try to init itself in the below
156 * walk through devsw if we actually booted off of PXE.
158 if (kargs->bootflags & KARGS_FLAGS_PXE)
159 pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL);
160 else if (kargs->bootflags & KARGS_FLAGS_CD)
161 bc_add(initial_bootdev);
164 archsw.arch_autoload = i386_autoload;
165 archsw.arch_getdev = i386_getdev;
166 archsw.arch_copyin = i386_copyin;
167 archsw.arch_copyout = i386_copyout;
168 archsw.arch_readin = i386_readin;
169 archsw.arch_isainb = isa_inb;
170 archsw.arch_isaoutb = isa_outb;
171 #ifdef LOADER_ZFS_SUPPORT
172 archsw.arch_zfs_probe = i386_zfs_probe;
174 #ifdef LOADER_GELI_SUPPORT
175 if ((kargs->bootflags & KARGS_FLAGS_EXTARG) != 0) {
176 zargs = (struct zfs_boot_args *)(kargs + 1);
177 if (zargs != NULL && zargs->size >= offsetof(struct zfs_boot_args, gelipw)) {
178 if (zargs->size >= offsetof(struct zfs_boot_args, keybuf_sentinel) &&
179 zargs->keybuf_sentinel == KEYBUF_SENTINEL) {
180 geli_save_keybuf(zargs->keybuf);
182 if (zargs->gelipw[0] != '\0') {
183 setenv("kern.geom.eli.passphrase", zargs->gelipw, 1);
184 explicit_bzero(zargs->gelipw, sizeof(zargs->gelipw));
188 #endif /* LOADER_GELI_SUPPORT */
189 #else /* !LOADER_ZFS_SUPPORT */
190 #ifdef LOADER_GELI_SUPPORT
191 if ((kargs->bootflags & KARGS_FLAGS_EXTARG) != 0) {
192 gargs = (struct geli_boot_args *)(kargs + 1);
193 if (gargs != NULL && gargs->size >= offsetof(struct geli_boot_args, gelipw)) {
194 if (gargs->keybuf_sentinel == KEYBUF_SENTINEL) {
195 geli_save_keybuf(gargs->keybuf);
197 if (gargs->gelipw[0] != '\0') {
198 setenv("kern.geom.eli.passphrase", gargs->gelipw, 1);
199 explicit_bzero(gargs->gelipw, sizeof(gargs->gelipw));
203 #endif /* LOADER_GELI_SUPPORT */
204 #endif /* LOADER_ZFS_SUPPORT */
207 * March through the device switch probing for things.
209 for (i = 0; devsw[i] != NULL; i++)
210 if (devsw[i]->dv_init != NULL)
211 (devsw[i]->dv_init)();
212 printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024);
213 if (initial_bootinfo != NULL) {
214 initial_bootinfo->bi_basemem = bios_basemem / 1024;
215 initial_bootinfo->bi_extmem = bios_extmem / 1024;
218 /* detect ACPI for future reference */
221 /* detect SMBIOS for future reference */
224 /* detect PCI BIOS for future reference */
227 printf("\n%s", bootprog_info);
229 extract_currdev(); /* set $currdev and $loaddev */
230 setenv("LINES", "24", 1); /* optional */
236 /* if we ever get here, it is an error */
241 * Set the 'current device' by (if possible) recovering the boot device as
242 * supplied by the initial bootstrap.
244 * XXX should be extended for netbooting.
247 extract_currdev(void)
249 struct i386_devdesc new_currdev;
250 #ifdef LOADER_ZFS_SUPPORT
255 /* Assume we are booting from a BIOS disk by default */
256 new_currdev.d_dev = &biosdisk;
258 /* new-style boot loaders such as pxeldr and cdldr */
259 if (kargs->bootinfo == 0) {
260 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) {
261 /* we are booting from a CD with cdboot */
262 new_currdev.d_dev = &bioscd;
263 new_currdev.d_unit = bc_bios2unit(initial_bootdev);
264 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) {
265 /* we are booting from pxeldr */
266 new_currdev.d_dev = &pxedisk;
267 new_currdev.d_unit = 0;
269 /* we don't know what our boot device is */
270 new_currdev.d_kind.biosdisk.slice = -1;
271 new_currdev.d_kind.biosdisk.partition = 0;
274 #ifdef LOADER_ZFS_SUPPORT
275 } else if ((kargs->bootflags & KARGS_FLAGS_ZFS) != 0) {
277 /* check for new style extended argument */
278 if ((kargs->bootflags & KARGS_FLAGS_EXTARG) != 0)
279 zargs = (struct zfs_boot_args *)(kargs + 1);
282 zargs->size >= offsetof(struct zfs_boot_args, primary_pool)) {
283 /* sufficient data is provided */
284 new_currdev.d_kind.zfs.pool_guid = zargs->pool;
285 new_currdev.d_kind.zfs.root_guid = zargs->root;
286 if (zargs->size >= sizeof(*zargs) && zargs->primary_vdev != 0) {
287 sprintf(buf, "%llu", zargs->primary_pool);
288 setenv("vfs.zfs.boot.primary_pool", buf, 1);
289 sprintf(buf, "%llu", zargs->primary_vdev);
290 setenv("vfs.zfs.boot.primary_vdev", buf, 1);
293 /* old style zfsboot block */
294 new_currdev.d_kind.zfs.pool_guid = kargs->zfspool;
295 new_currdev.d_kind.zfs.root_guid = 0;
297 new_currdev.d_dev = &zfs_dev;
299 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) {
300 /* The passed-in boot device is bad */
301 new_currdev.d_kind.biosdisk.slice = -1;
302 new_currdev.d_kind.biosdisk.partition = 0;
305 new_currdev.d_kind.biosdisk.slice = B_SLICE(initial_bootdev) - 1;
306 new_currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev);
307 biosdev = initial_bootinfo->bi_bios_dev;
310 * If we are booted by an old bootstrap, we have to guess at the BIOS
311 * unit number. We will lose if there is more than one disk type
312 * and we are not booting from the lowest-numbered disk type
313 * (ie. SCSI when IDE also exists).
315 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) /* biosdev doesn't match major */
316 biosdev = 0x80 + B_UNIT(initial_bootdev); /* assume harddisk */
318 new_currdev.d_type = new_currdev.d_dev->dv_type;
321 * If we are booting off of a BIOS disk and we didn't succeed in determining
322 * which one we booted off of, just use disk0: as a reasonable default.
324 if ((new_currdev.d_type == biosdisk.dv_type) &&
325 ((new_currdev.d_unit = bd_bios2unit(biosdev)) == -1)) {
326 printf("Can't work out which disk we are booting from.\n"
327 "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev);
328 new_currdev.d_unit = 0;
331 #ifdef LOADER_ZFS_SUPPORT
332 if (new_currdev.d_type == DEVT_ZFS)
333 init_zfs_bootenv(zfs_fmtdev(&new_currdev));
336 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev),
337 i386_setcurrdev, env_nounset);
338 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), env_noset,
342 COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot);
345 command_reboot(int argc, char *argv[])
349 for (i = 0; devsw[i] != NULL; ++i)
350 if (devsw[i]->dv_cleanup != NULL)
351 (devsw[i]->dv_cleanup)();
353 printf("Rebooting...\n");
358 /* provide this for panic, as it's not in the startup code */
365 COMMAND_SET(heap, "heap", "show heap usage", command_heap);
368 command_heap(int argc, char *argv[])
371 printf("heap base at %p, top at %p, upper limit at %p\n", heap_bottom,
376 #ifdef LOADER_ZFS_SUPPORT
377 COMMAND_SET(lszfs, "lszfs", "list child datasets of a zfs dataset",
381 command_lszfs(int argc, char *argv[])
386 command_errmsg = "wrong number of arguments";
390 err = zfs_list(argv[1]);
392 command_errmsg = strerror(err);
399 COMMAND_SET(reloadbe, "reloadbe", "refresh the list of ZFS Boot Environments",
403 command_reloadbe(int argc, char *argv[])
409 command_errmsg = "wrong number of arguments";
414 err = zfs_bootenv(argv[1]);
416 root = getenv("zfs_be_root");
418 /* There does not appear to be a ZFS pool here, exit without error */
421 err = zfs_bootenv(getenv("zfs_be_root"));
425 command_errmsg = strerror(err);
433 /* ISA bus access functions for PnP. */
442 isa_outb(int port, int value)
448 #ifdef LOADER_ZFS_SUPPORT
456 * Open all the disks we can find and see if we can reconstruct
457 * ZFS pools from them.
459 for (unit = 0; unit < MAXBDDEV; unit++) {
460 if (bd_unit2bios(unit) == -1)
462 sprintf(devname, "disk%d:", unit);
463 zfs_probe_dev(devname, NULL);