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 ? (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. Once this is done, malloc() is usable.
115 #if defined(LOADER_BZIP2_SUPPORT) || defined(LOADER_FIREWIRE_SUPPORT) || \
116 defined(LOADER_GPT_SUPPORT) || defined(LOADER_ZFS_SUPPORT)
117 if (high_heap_size > 0) {
118 heap_top = PTOV(high_heap_base + high_heap_size);
119 heap_bottom = PTOV(high_heap_base);
120 if (high_heap_base < memtop_copyin)
121 memtop_copyin = high_heap_base;
125 heap_top = (void *)PTOV(bios_basemem);
126 heap_bottom = (void *)end;
128 setheap(heap_bottom, heap_top);
131 * XXX Chicken-and-egg problem; we want to have console output early, but some
132 * console attributes may depend on reading from eg. the boot device, which we
135 * We can use printf() etc. once this is done.
136 * If the previous boot stage has requested a serial console, prefer that.
138 bi_setboothowto(initial_howto);
139 if (initial_howto & RB_MULTIPLE) {
140 if (initial_howto & RB_SERIAL)
141 setenv("console", "comconsole vidconsole", 1);
143 setenv("console", "vidconsole comconsole", 1);
144 } else if (initial_howto & RB_SERIAL)
145 setenv("console", "comconsole", 1);
146 else if (initial_howto & RB_MUTE)
147 setenv("console", "nullconsole", 1);
151 * Initialise the block cache. Set the upper limit.
153 bcache_init(32768, 512);
156 * Special handling for PXE and CD booting.
158 if (kargs->bootinfo == 0) {
160 * We only want the PXE disk to try to init itself in the below
161 * walk through devsw if we actually booted off of PXE.
163 if (kargs->bootflags & KARGS_FLAGS_PXE)
164 pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL);
165 else if (kargs->bootflags & KARGS_FLAGS_CD)
166 bc_add(initial_bootdev);
169 archsw.arch_autoload = i386_autoload;
170 archsw.arch_getdev = i386_getdev;
171 archsw.arch_copyin = i386_copyin;
172 archsw.arch_copyout = i386_copyout;
173 archsw.arch_readin = i386_readin;
174 archsw.arch_isainb = isa_inb;
175 archsw.arch_isaoutb = isa_outb;
176 archsw.arch_hypervisor = x86_hypervisor;
177 #ifdef LOADER_ZFS_SUPPORT
178 archsw.arch_zfs_probe = i386_zfs_probe;
181 * zfsboot and gptzfsboot have always passed KARGS_FLAGS_ZFS, so if that is
182 * set along with KARGS_FLAGS_EXTARG we know we can interpret the extarg
183 * data as a struct zfs_boot_args.
185 #define KARGS_EXTARGS_ZFS (KARGS_FLAGS_EXTARG | KARGS_FLAGS_ZFS)
187 if ((kargs->bootflags & KARGS_EXTARGS_ZFS) == KARGS_EXTARGS_ZFS) {
188 zargs = (struct zfs_boot_args *)(kargs + 1);
190 #endif /* LOADER_ZFS_SUPPORT */
192 #ifdef LOADER_GELI_SUPPORT
194 * If we decided earlier that we have zfs_boot_args extarg data, and it is
195 * big enough to contain the embedded geli data (the early zfs_boot_args
196 * structs weren't), then init the gbdata pointer accordingly. If there is
197 * extarg data which isn't zfs_boot_args data, determine whether it is
198 * geli_boot_args data. Recent versions of gptboot set KARGS_FLAGS_GELI to
199 * indicate that. Earlier versions didn't, but we presume that's what we
200 * have if the extarg size exactly matches the size of the geli_boot_args
201 * struct during that pre-flag era.
203 #define LEGACY_GELI_ARGS_SIZE 260 /* This can never change */
205 #ifdef LOADER_ZFS_SUPPORT
207 if (zargs->size > offsetof(struct zfs_boot_args, gelidata)) {
208 gbdata = &zargs->gelidata;
211 #endif /* LOADER_ZFS_SUPPORT */
212 if ((kargs->bootflags & KARGS_FLAGS_EXTARG) != 0) {
213 gargs = (struct geli_boot_args *)(kargs + 1);
214 if ((kargs->bootflags & KARGS_FLAGS_GELI) ||
215 gargs->size == LEGACY_GELI_ARGS_SIZE) {
216 gbdata = &gargs->gelidata;
221 import_geli_boot_data(gbdata);
222 #endif /* LOADER_GELI_SUPPORT */
225 * March through the device switch probing for things.
227 for (i = 0; devsw[i] != NULL; i++)
228 if (devsw[i]->dv_init != NULL)
229 (devsw[i]->dv_init)();
230 printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024);
231 if (initial_bootinfo != NULL) {
232 initial_bootinfo->bi_basemem = bios_basemem / 1024;
233 initial_bootinfo->bi_extmem = bios_extmem / 1024;
236 /* detect ACPI for future reference */
239 /* detect SMBIOS for future reference */
242 /* detect PCI BIOS for future reference */
245 printf("\n%s", bootprog_info);
247 extract_currdev(); /* set $currdev and $loaddev */
253 /* if we ever get here, it is an error */
258 * Set the 'current device' by (if possible) recovering the boot device as
259 * supplied by the initial bootstrap.
261 * XXX should be extended for netbooting.
264 extract_currdev(void)
266 struct i386_devdesc new_currdev;
267 #ifdef LOADER_ZFS_SUPPORT
272 /* Assume we are booting from a BIOS disk by default */
273 new_currdev.dd.d_dev = &bioshd;
275 /* new-style boot loaders such as pxeldr and cdldr */
276 if (kargs->bootinfo == 0) {
277 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) {
278 /* we are booting from a CD with cdboot */
279 new_currdev.dd.d_dev = &bioscd;
280 new_currdev.dd.d_unit = bd_bios2unit(initial_bootdev);
281 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) {
282 /* we are booting from pxeldr */
283 new_currdev.dd.d_dev = &pxedisk;
284 new_currdev.dd.d_unit = 0;
286 /* we don't know what our boot device is */
287 new_currdev.d_kind.biosdisk.slice = -1;
288 new_currdev.d_kind.biosdisk.partition = 0;
291 #ifdef LOADER_ZFS_SUPPORT
292 } else if ((kargs->bootflags & KARGS_FLAGS_ZFS) != 0) {
293 /* zargs was set in main() if we have new style extended argument */
295 zargs->size >= offsetof(struct zfs_boot_args, primary_pool)) {
296 /* sufficient data is provided */
297 new_currdev.d_kind.zfs.pool_guid = zargs->pool;
298 new_currdev.d_kind.zfs.root_guid = zargs->root;
299 if (zargs->size >= sizeof(*zargs) && zargs->primary_vdev != 0) {
300 sprintf(buf, "%llu", zargs->primary_pool);
301 setenv("vfs.zfs.boot.primary_pool", buf, 1);
302 sprintf(buf, "%llu", zargs->primary_vdev);
303 setenv("vfs.zfs.boot.primary_vdev", buf, 1);
306 /* old style zfsboot block */
307 new_currdev.d_kind.zfs.pool_guid = kargs->zfspool;
308 new_currdev.d_kind.zfs.root_guid = 0;
310 new_currdev.dd.d_dev = &zfs_dev;
312 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) {
313 /* The passed-in boot device is bad */
314 new_currdev.d_kind.biosdisk.slice = -1;
315 new_currdev.d_kind.biosdisk.partition = 0;
318 new_currdev.d_kind.biosdisk.slice = B_SLICE(initial_bootdev) - 1;
319 new_currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev);
320 biosdev = initial_bootinfo->bi_bios_dev;
323 * If we are booted by an old bootstrap, we have to guess at the BIOS
324 * unit number. We will lose if there is more than one disk type
325 * and we are not booting from the lowest-numbered disk type
326 * (ie. SCSI when IDE also exists).
328 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) /* biosdev doesn't match major */
329 biosdev = 0x80 + B_UNIT(initial_bootdev); /* assume harddisk */
333 * If we are booting off of a BIOS disk and we didn't succeed in determining
334 * which one we booted off of, just use disk0: as a reasonable default.
336 if ((new_currdev.dd.d_dev->dv_type == bioshd.dv_type) &&
337 ((new_currdev.dd.d_unit = bd_bios2unit(biosdev)) == -1)) {
338 printf("Can't work out which disk we are booting from.\n"
339 "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev);
340 new_currdev.dd.d_unit = 0;
343 #ifdef LOADER_ZFS_SUPPORT
344 if (new_currdev.dd.d_dev->dv_type == DEVT_ZFS)
345 init_zfs_bootenv(zfs_fmtdev(&new_currdev));
348 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev),
349 i386_setcurrdev, env_nounset);
350 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), env_noset,
354 COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot);
357 command_reboot(int argc, char *argv[])
361 for (i = 0; devsw[i] != NULL; ++i)
362 if (devsw[i]->dv_cleanup != NULL)
363 (devsw[i]->dv_cleanup)();
365 printf("Rebooting...\n");
370 /* provide this for panic, as it's not in the startup code */
377 COMMAND_SET(heap, "heap", "show heap usage", command_heap);
380 command_heap(int argc, char *argv[])
383 printf("heap base at %p, top at %p, upper limit at %p\n", heap_bottom,
388 /* ISA bus access functions for PnP. */
397 isa_outb(int port, int value)
403 #ifdef LOADER_ZFS_SUPPORT
408 struct i386_devdesc dev;
411 * Open all the disks we can find and see if we can reconstruct
412 * ZFS pools from them.
414 dev.dd.d_dev = &bioshd;
415 for (dev.dd.d_unit = 0; bd_unit2bios(&dev) >= 0; dev.dd.d_unit++) {
416 snprintf(devname, sizeof(devname), "%s%d:", bioshd.dv_name,
418 zfs_probe_dev(devname, NULL);