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"
51 #ifdef LOADER_ZFS_SUPPORT
52 #include <sys/zfs_bootenv.h>
56 CTASSERT(sizeof(struct bootargs) == BOOTARGS_SIZE);
57 CTASSERT(offsetof(struct bootargs, bootinfo) == BA_BOOTINFO);
58 CTASSERT(offsetof(struct bootargs, bootflags) == BA_BOOTFLAGS);
59 CTASSERT(offsetof(struct bootinfo, bi_size) == BI_SIZE);
61 /* Arguments passed in from the boot1/boot2 loader */
62 static struct bootargs *kargs;
64 static uint32_t initial_howto;
65 static uint32_t initial_bootdev;
66 static struct bootinfo *initial_bootinfo;
68 struct arch_switch archsw; /* MI/MD interface boundary */
70 static void extract_currdev(void);
71 static int isa_inb(int port);
72 static void isa_outb(int port, int value);
74 #ifdef LOADER_GELI_SUPPORT
76 struct geli_boot_args *gargs;
77 struct geli_boot_data *gbdata;
79 #ifdef LOADER_ZFS_SUPPORT
80 struct zfs_boot_args *zargs;
81 static void i386_zfs_probe(void);
87 static void *heap_top;
88 static void *heap_bottom;
99 /* Pick up arguments */
100 kargs = (void *)__args;
101 initial_howto = kargs->howto;
102 initial_bootdev = kargs->bootdev;
103 initial_bootinfo = kargs->bootinfo ?
104 (struct bootinfo *)PTOV(kargs->bootinfo) : NULL;
106 /* Initialize the v86 register set to a known-good state. */
107 bzero(&v86, sizeof(v86));
108 v86.efl = PSL_RESERVED_DEFAULT | PSL_I;
111 * Initialise the heap as early as possible.
112 * Once this is done, malloc() is usable.
116 #if defined(LOADER_BZIP2_SUPPORT) || \
117 defined(LOADER_GPT_SUPPORT) || defined(LOADER_ZFS_SUPPORT)
118 if (high_heap_size > 0) {
119 heap_top = PTOV(high_heap_base + high_heap_size);
120 heap_bottom = PTOV(high_heap_base);
121 if (high_heap_base < memtop_copyin)
122 memtop_copyin = high_heap_base;
126 heap_top = (void *)PTOV(bios_basemem);
127 heap_bottom = (void *)end;
129 setheap(heap_bottom, heap_top);
132 * Now that malloc is usable, allocate a buffer for tslog and start
133 * logging timestamps during the boot process.
138 * detect ACPI for future reference. This may set console to comconsole
139 * if we do have ACPI SPCR table.
144 * XXX Chicken-and-egg problem; we want to have console output early,
145 * but some console attributes may depend on reading from eg. the boot
146 * device, which we can't do yet.
148 * We can use printf() etc. once this is done.
149 * If the previous boot stage has requested a serial console,
152 bi_setboothowto(initial_howto);
153 if (initial_howto & RB_MULTIPLE) {
154 if (initial_howto & RB_SERIAL)
155 setenv("console", "comconsole vidconsole", 1);
157 setenv("console", "vidconsole comconsole", 1);
158 } else if (initial_howto & RB_SERIAL) {
159 setenv("console", "comconsole", 1);
160 } else if (initial_howto & RB_MUTE) {
161 setenv("console", "nullconsole", 1);
165 /* Set up currdev variable to have hooks in place. */
166 env_setenv("currdev", EV_VOLATILE | EV_NOHOOK, "",
167 gen_setcurrdev, env_nounset);
170 * Initialise the block cache. Set the upper limit.
172 bcache_init(32768, 512);
175 * Special handling for PXE and CD booting.
177 if (kargs->bootinfo == 0) {
179 * We only want the PXE disk to try to init itself in the below
180 * walk through devsw if we actually booted off of PXE.
182 if (kargs->bootflags & KARGS_FLAGS_PXE)
183 pxe_enable(kargs->pxeinfo ?
184 PTOV(kargs->pxeinfo) : NULL);
185 else if (kargs->bootflags & KARGS_FLAGS_CD)
186 bc_add(initial_bootdev);
189 archsw.arch_autoload = i386_autoload;
190 archsw.arch_getdev = i386_getdev;
191 archsw.arch_copyin = i386_copyin;
192 archsw.arch_copyout = i386_copyout;
193 archsw.arch_readin = i386_readin;
194 archsw.arch_isainb = isa_inb;
195 archsw.arch_isaoutb = isa_outb;
196 archsw.arch_hypervisor = x86_hypervisor;
197 #ifdef LOADER_ZFS_SUPPORT
198 archsw.arch_zfs_probe = i386_zfs_probe;
201 * zfsboot and gptzfsboot have always passed KARGS_FLAGS_ZFS,
202 * so if that is set along with KARGS_FLAGS_EXTARG we know we
203 * can interpret the extarg data as a struct zfs_boot_args.
205 #define KARGS_EXTARGS_ZFS (KARGS_FLAGS_EXTARG | KARGS_FLAGS_ZFS)
207 if ((kargs->bootflags & KARGS_EXTARGS_ZFS) == KARGS_EXTARGS_ZFS) {
208 zargs = (struct zfs_boot_args *)(kargs + 1);
210 #endif /* LOADER_ZFS_SUPPORT */
212 #ifdef LOADER_GELI_SUPPORT
214 * If we decided earlier that we have zfs_boot_args extarg data,
215 * and it is big enough to contain the embedded geli data
216 * (the early zfs_boot_args structs weren't), then init the gbdata
217 * pointer accordingly. If there is extarg data which isn't
218 * zfs_boot_args data, determine whether it is geli_boot_args data.
219 * Recent versions of gptboot set KARGS_FLAGS_GELI to indicate that.
220 * Earlier versions didn't, but we presume that's what we
221 * have if the extarg size exactly matches the size of the
222 * geli_boot_args struct during that pre-flag era.
224 #define LEGACY_GELI_ARGS_SIZE 260 /* This can never change */
226 #ifdef LOADER_ZFS_SUPPORT
228 if (zargs->size > offsetof(struct zfs_boot_args, gelidata)) {
229 gbdata = &zargs->gelidata;
232 #endif /* LOADER_ZFS_SUPPORT */
233 if ((kargs->bootflags & KARGS_FLAGS_EXTARG) != 0) {
234 gargs = (struct geli_boot_args *)(kargs + 1);
235 if ((kargs->bootflags & KARGS_FLAGS_GELI) ||
236 gargs->size == LEGACY_GELI_ARGS_SIZE) {
237 gbdata = &gargs->gelidata;
242 import_geli_boot_data(gbdata);
243 #endif /* LOADER_GELI_SUPPORT */
247 printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024,
249 if (initial_bootinfo != NULL) {
250 initial_bootinfo->bi_basemem = bios_basemem / 1024;
251 initial_bootinfo->bi_extmem = bios_extmem / 1024;
254 /* detect SMBIOS for future reference */
257 /* detect PCI BIOS for future reference */
260 printf("\n%s", bootprog_info);
262 extract_currdev(); /* set $currdev and $loaddev */
269 /* if we ever get here, it is an error */
274 * Set the 'current device' by (if possible) recovering the boot device as
275 * supplied by the initial bootstrap.
277 * XXX should be extended for netbooting.
280 extract_currdev(void)
282 struct i386_devdesc new_currdev;
283 #ifdef LOADER_ZFS_SUPPORT
289 /* Assume we are booting from a BIOS disk by default */
290 new_currdev.dd.d_dev = &bioshd;
292 /* new-style boot loaders such as pxeldr and cdldr */
293 if (kargs->bootinfo == 0) {
294 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) {
295 /* we are booting from a CD with cdboot */
296 new_currdev.dd.d_dev = &bioscd;
297 new_currdev.dd.d_unit = bd_bios2unit(initial_bootdev);
298 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) {
299 /* we are booting from pxeldr */
300 new_currdev.dd.d_dev = &pxedisk;
301 new_currdev.dd.d_unit = 0;
303 /* we don't know what our boot device is */
304 new_currdev.disk.d_slice = -1;
305 new_currdev.disk.d_partition = 0;
308 #ifdef LOADER_ZFS_SUPPORT
309 } else if ((kargs->bootflags & KARGS_FLAGS_ZFS) != 0) {
311 * zargs was set in main() if we have new style extended
316 offsetof(struct zfs_boot_args, primary_pool)) {
317 /* sufficient data is provided */
318 new_currdev.zfs.pool_guid = zargs->pool;
319 new_currdev.zfs.root_guid = zargs->root;
320 if (zargs->size >= sizeof(*zargs) &&
321 zargs->primary_vdev != 0) {
322 sprintf(buf, "%llu", zargs->primary_pool);
323 setenv("vfs.zfs.boot.primary_pool", buf, 1);
324 sprintf(buf, "%llu", zargs->primary_vdev);
325 setenv("vfs.zfs.boot.primary_vdev", buf, 1);
328 /* old style zfsboot block */
329 new_currdev.zfs.pool_guid = kargs->zfspool;
330 new_currdev.zfs.root_guid = 0;
332 new_currdev.dd.d_dev = &zfs_dev;
334 if ((bootonce = malloc(VDEV_PAD_SIZE)) != NULL) {
335 if (zfs_get_bootonce(&new_currdev, OS_BOOTONCE_USED,
336 bootonce, VDEV_PAD_SIZE) == 0) {
337 setenv("zfs-bootonce", bootonce, 1);
340 (void) zfs_attach_nvstore(&new_currdev);
344 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) {
345 /* The passed-in boot device is bad */
346 new_currdev.disk.d_slice = -1;
347 new_currdev.disk.d_partition = 0;
350 new_currdev.disk.d_slice = B_SLICE(initial_bootdev) - 1;
351 new_currdev.disk.d_partition = B_PARTITION(initial_bootdev);
352 biosdev = initial_bootinfo->bi_bios_dev;
355 * If we are booted by an old bootstrap, we have to guess at
356 * the BIOS unit number. We will lose if there is more than
357 * one disk type and we are not booting from the
358 * lowest-numbered disk type (ie. SCSI when IDE also exists).
360 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) {
362 * biosdev doesn't match major, assume harddisk
364 biosdev = 0x80 + B_UNIT(initial_bootdev);
369 * If we are booting off of a BIOS disk and we didn't succeed
370 * in determining which one we booted off of, just use disk0:
371 * as a reasonable default.
373 if ((new_currdev.dd.d_dev->dv_type == bioshd.dv_type) &&
374 ((new_currdev.dd.d_unit = bd_bios2unit(biosdev)) == -1)) {
375 printf("Can't work out which disk we are booting "
376 "from.\nGuessed BIOS device 0x%x not found by "
377 "probes, defaulting to disk0:\n", biosdev);
378 new_currdev.dd.d_unit = 0;
381 #ifdef LOADER_ZFS_SUPPORT
382 if (new_currdev.dd.d_dev->dv_type == DEVT_ZFS)
383 init_zfs_boot_options(devformat(&new_currdev.dd));
386 set_currdev(devformat(&new_currdev.dd));
389 COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot);
392 command_reboot(int argc, char *argv[])
396 for (i = 0; devsw[i] != NULL; ++i)
397 if (devsw[i]->dv_cleanup != NULL)
398 (devsw[i]->dv_cleanup)();
400 printf("Rebooting...\n");
405 /* provide this for panic, as it's not in the startup code */
412 COMMAND_SET(heap, "heap", "show heap usage", command_heap);
415 command_heap(int argc, char *argv[])
418 printf("heap base at %p, top at %p, upper limit at %p\n", heap_bottom,
423 /* ISA bus access functions for PnP. */
432 isa_outb(int port, int value)
438 #ifdef LOADER_ZFS_SUPPORT
443 struct i386_devdesc dev;
446 * Open all the disks we can find and see if we can reconstruct
447 * ZFS pools from them.
449 dev.dd.d_dev = &bioshd;
450 for (dev.dd.d_unit = 0; bd_unit2bios(&dev) >= 0; dev.dd.d_unit++) {
451 snprintf(devname, sizeof(devname), "%s%d:", bioshd.dv_name,
453 zfs_probe_dev(devname, NULL, true);