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
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;
76 struct geli_boot_data *gbdata;
78 #ifdef LOADER_ZFS_SUPPORT
79 struct zfs_boot_args *zargs;
80 static void i386_zfs_probe(void);
86 static void *heap_top;
87 static void *heap_bottom;
100 /* Pick up arguments */
101 kargs = (void *)__args;
102 initial_howto = kargs->howto;
103 initial_bootdev = kargs->bootdev;
104 initial_bootinfo = kargs->bootinfo ?
105 (struct bootinfo *)PTOV(kargs->bootinfo) : NULL;
107 /* Initialize the v86 register set to a known-good state. */
108 bzero(&v86, sizeof(v86));
109 v86.efl = PSL_RESERVED_DEFAULT | PSL_I;
112 * Initialise the heap as early as possible.
113 * Once this is done, malloc() is usable.
117 #if defined(LOADER_BZIP2_SUPPORT) || defined(LOADER_FIREWIRE_SUPPORT) || \
118 defined(LOADER_GPT_SUPPORT) || defined(LOADER_ZFS_SUPPORT)
119 if (high_heap_size > 0) {
120 heap_top = PTOV(high_heap_base + high_heap_size);
121 heap_bottom = PTOV(high_heap_base);
122 if (high_heap_base < memtop_copyin)
123 memtop_copyin = high_heap_base;
127 heap_top = (void *)PTOV(bios_basemem);
128 heap_bottom = (void *)end;
130 setheap(heap_bottom, heap_top);
133 * XXX Chicken-and-egg problem; we want to have console output early,
134 * but some console attributes may depend on reading from eg. the boot
135 * device, which we can't do yet.
137 * We can use printf() etc. once this is done.
138 * If the previous boot stage has requested a serial console,
141 bi_setboothowto(initial_howto);
142 if (initial_howto & RB_MULTIPLE) {
143 if (initial_howto & RB_SERIAL)
144 setenv("console", "comconsole vidconsole", 1);
146 setenv("console", "vidconsole comconsole", 1);
147 } else if (initial_howto & RB_SERIAL) {
148 setenv("console", "comconsole", 1);
149 } else if (initial_howto & RB_MUTE) {
150 setenv("console", "nullconsole", 1);
155 * Initialise the block cache. Set the upper limit.
157 bcache_init(32768, 512);
160 * Special handling for PXE and CD booting.
162 if (kargs->bootinfo == 0) {
164 * We only want the PXE disk to try to init itself in the below
165 * walk through devsw if we actually booted off of PXE.
167 if (kargs->bootflags & KARGS_FLAGS_PXE)
168 pxe_enable(kargs->pxeinfo ?
169 PTOV(kargs->pxeinfo) : NULL);
170 else if (kargs->bootflags & KARGS_FLAGS_CD)
171 bc_add(initial_bootdev);
174 archsw.arch_autoload = i386_autoload;
175 archsw.arch_getdev = i386_getdev;
176 archsw.arch_copyin = i386_copyin;
177 archsw.arch_copyout = i386_copyout;
178 archsw.arch_readin = i386_readin;
179 archsw.arch_isainb = isa_inb;
180 archsw.arch_isaoutb = isa_outb;
181 archsw.arch_hypervisor = x86_hypervisor;
182 #ifdef LOADER_ZFS_SUPPORT
183 archsw.arch_zfs_probe = i386_zfs_probe;
186 * zfsboot and gptzfsboot have always passed KARGS_FLAGS_ZFS,
187 * so if that is set along with KARGS_FLAGS_EXTARG we know we
188 * can interpret the extarg data as a struct zfs_boot_args.
190 #define KARGS_EXTARGS_ZFS (KARGS_FLAGS_EXTARG | KARGS_FLAGS_ZFS)
192 if ((kargs->bootflags & KARGS_EXTARGS_ZFS) == KARGS_EXTARGS_ZFS) {
193 zargs = (struct zfs_boot_args *)(kargs + 1);
195 #endif /* LOADER_ZFS_SUPPORT */
197 #ifdef LOADER_GELI_SUPPORT
199 * If we decided earlier that we have zfs_boot_args extarg data,
200 * and it is big enough to contain the embedded geli data
201 * (the early zfs_boot_args structs weren't), then init the gbdata
202 * pointer accordingly. If there is extarg data which isn't
203 * zfs_boot_args data, determine whether it is geli_boot_args data.
204 * Recent versions of gptboot set KARGS_FLAGS_GELI to indicate that.
205 * Earlier versions didn't, but we presume that's what we
206 * have if the extarg size exactly matches the size of the
207 * geli_boot_args struct during that pre-flag era.
209 #define LEGACY_GELI_ARGS_SIZE 260 /* This can never change */
211 #ifdef LOADER_ZFS_SUPPORT
213 if (zargs->size > offsetof(struct zfs_boot_args, gelidata)) {
214 gbdata = &zargs->gelidata;
217 #endif /* LOADER_ZFS_SUPPORT */
218 if ((kargs->bootflags & KARGS_FLAGS_EXTARG) != 0) {
219 gargs = (struct geli_boot_args *)(kargs + 1);
220 if ((kargs->bootflags & KARGS_FLAGS_GELI) ||
221 gargs->size == LEGACY_GELI_ARGS_SIZE) {
222 gbdata = &gargs->gelidata;
227 import_geli_boot_data(gbdata);
228 #endif /* LOADER_GELI_SUPPORT */
231 * March through the device switch probing for things.
233 for (i = 0; devsw[i] != NULL; i++)
234 if (devsw[i]->dv_init != NULL)
235 (devsw[i]->dv_init)();
237 printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024,
239 if (initial_bootinfo != NULL) {
240 initial_bootinfo->bi_basemem = bios_basemem / 1024;
241 initial_bootinfo->bi_extmem = bios_extmem / 1024;
244 /* detect ACPI for future reference */
247 /* detect SMBIOS for future reference */
250 /* detect PCI BIOS for future reference */
253 printf("\n%s", bootprog_info);
255 extract_currdev(); /* set $currdev and $loaddev */
261 /* if we ever get here, it is an error */
266 * Set the 'current device' by (if possible) recovering the boot device as
267 * supplied by the initial bootstrap.
269 * XXX should be extended for netbooting.
272 extract_currdev(void)
274 struct i386_devdesc new_currdev;
275 #ifdef LOADER_ZFS_SUPPORT
280 /* Assume we are booting from a BIOS disk by default */
281 new_currdev.dd.d_dev = &bioshd;
283 /* new-style boot loaders such as pxeldr and cdldr */
284 if (kargs->bootinfo == 0) {
285 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) {
286 /* we are booting from a CD with cdboot */
287 new_currdev.dd.d_dev = &bioscd;
288 new_currdev.dd.d_unit = bd_bios2unit(initial_bootdev);
289 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) {
290 /* we are booting from pxeldr */
291 new_currdev.dd.d_dev = &pxedisk;
292 new_currdev.dd.d_unit = 0;
294 /* we don't know what our boot device is */
295 new_currdev.d_kind.biosdisk.slice = -1;
296 new_currdev.d_kind.biosdisk.partition = 0;
299 #ifdef LOADER_ZFS_SUPPORT
300 } else if ((kargs->bootflags & KARGS_FLAGS_ZFS) != 0) {
302 * zargs was set in main() if we have new style extended
307 offsetof(struct zfs_boot_args, primary_pool)) {
308 /* sufficient data is provided */
309 new_currdev.d_kind.zfs.pool_guid = zargs->pool;
310 new_currdev.d_kind.zfs.root_guid = zargs->root;
311 if (zargs->size >= sizeof(*zargs) &&
312 zargs->primary_vdev != 0) {
313 sprintf(buf, "%llu", zargs->primary_pool);
314 setenv("vfs.zfs.boot.primary_pool", buf, 1);
315 sprintf(buf, "%llu", zargs->primary_vdev);
316 setenv("vfs.zfs.boot.primary_vdev", buf, 1);
319 /* old style zfsboot block */
320 new_currdev.d_kind.zfs.pool_guid = kargs->zfspool;
321 new_currdev.d_kind.zfs.root_guid = 0;
323 new_currdev.dd.d_dev = &zfs_dev;
325 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) {
326 /* The passed-in boot device is bad */
327 new_currdev.d_kind.biosdisk.slice = -1;
328 new_currdev.d_kind.biosdisk.partition = 0;
331 new_currdev.d_kind.biosdisk.slice =
332 B_SLICE(initial_bootdev) - 1;
333 new_currdev.d_kind.biosdisk.partition =
334 B_PARTITION(initial_bootdev);
335 biosdev = initial_bootinfo->bi_bios_dev;
338 * If we are booted by an old bootstrap, we have to guess at
339 * the BIOS unit number. We will lose if there is more than
340 * one disk type and we are not booting from the
341 * lowest-numbered disk type (ie. SCSI when IDE also exists).
343 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) {
345 * biosdev doesn't match major, assume harddisk
347 biosdev = 0x80 + B_UNIT(initial_bootdev);
352 * If we are booting off of a BIOS disk and we didn't succeed
353 * in determining which one we booted off of, just use disk0:
354 * as a reasonable default.
356 if ((new_currdev.dd.d_dev->dv_type == bioshd.dv_type) &&
357 ((new_currdev.dd.d_unit = bd_bios2unit(biosdev)) == -1)) {
358 printf("Can't work out which disk we are booting "
359 "from.\nGuessed BIOS device 0x%x not found by "
360 "probes, defaulting to disk0:\n", biosdev);
361 new_currdev.dd.d_unit = 0;
364 #ifdef LOADER_ZFS_SUPPORT
365 if (new_currdev.dd.d_dev->dv_type == DEVT_ZFS)
366 init_zfs_bootenv(zfs_fmtdev(&new_currdev));
369 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev),
370 i386_setcurrdev, env_nounset);
371 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev),
372 env_noset, env_nounset);
375 COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot);
378 command_reboot(int argc, char *argv[])
382 for (i = 0; devsw[i] != NULL; ++i)
383 if (devsw[i]->dv_cleanup != NULL)
384 (devsw[i]->dv_cleanup)();
386 printf("Rebooting...\n");
391 /* provide this for panic, as it's not in the startup code */
398 COMMAND_SET(heap, "heap", "show heap usage", command_heap);
401 command_heap(int argc, char *argv[])
404 printf("heap base at %p, top at %p, upper limit at %p\n", heap_bottom,
409 /* ISA bus access functions for PnP. */
418 isa_outb(int port, int value)
424 #ifdef LOADER_ZFS_SUPPORT
429 struct i386_devdesc dev;
432 * Open all the disks we can find and see if we can reconstruct
433 * ZFS pools from them.
435 dev.dd.d_dev = &bioshd;
436 for (dev.dd.d_unit = 0; bd_unit2bios(&dev) >= 0; dev.dd.d_unit++) {
437 snprintf(devname, sizeof(devname), "%s%d:", bioshd.dv_name,
439 zfs_probe_dev(devname, NULL);