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;
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;
94 /* Pick up arguments */
95 kargs = (void *)__args;
96 initial_howto = kargs->howto;
97 initial_bootdev = kargs->bootdev;
98 initial_bootinfo = kargs->bootinfo ? (struct bootinfo *)PTOV(kargs->bootinfo) : NULL;
100 /* Initialize the v86 register set to a known-good state. */
101 bzero(&v86, sizeof(v86));
102 v86.efl = PSL_RESERVED_DEFAULT | PSL_I;
105 * Initialise the heap as early as possible. Once this is done, malloc() is usable.
109 #if defined(LOADER_BZIP2_SUPPORT) || defined(LOADER_FIREWIRE_SUPPORT) || \
110 defined(LOADER_GPT_SUPPORT) || defined(LOADER_ZFS_SUPPORT)
111 if (high_heap_size > 0) {
112 heap_top = PTOV(high_heap_base + high_heap_size);
113 heap_bottom = PTOV(high_heap_base);
114 if (high_heap_base < memtop_copyin)
115 memtop_copyin = high_heap_base;
119 heap_top = (void *)PTOV(bios_basemem);
120 heap_bottom = (void *)end;
122 setheap(heap_bottom, heap_top);
125 * XXX Chicken-and-egg problem; we want to have console output early, but some
126 * console attributes may depend on reading from eg. the boot device, which we
129 * We can use printf() etc. once this is done.
130 * If the previous boot stage has requested a serial console, prefer that.
132 bi_setboothowto(initial_howto);
133 if (initial_howto & RB_MULTIPLE) {
134 if (initial_howto & RB_SERIAL)
135 setenv("console", "comconsole vidconsole", 1);
137 setenv("console", "vidconsole comconsole", 1);
138 } else if (initial_howto & RB_SERIAL)
139 setenv("console", "comconsole", 1);
140 else if (initial_howto & RB_MUTE)
141 setenv("console", "nullconsole", 1);
145 * Initialise the block cache. Set the upper limit.
147 bcache_init(32768, 512);
150 * Special handling for PXE and CD booting.
152 if (kargs->bootinfo == 0) {
154 * We only want the PXE disk to try to init itself in the below
155 * walk through devsw if we actually booted off of PXE.
157 if (kargs->bootflags & KARGS_FLAGS_PXE)
158 pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL);
159 else if (kargs->bootflags & KARGS_FLAGS_CD)
160 bc_add(initial_bootdev);
163 archsw.arch_autoload = i386_autoload;
164 archsw.arch_getdev = i386_getdev;
165 archsw.arch_copyin = i386_copyin;
166 archsw.arch_copyout = i386_copyout;
167 archsw.arch_readin = i386_readin;
168 archsw.arch_isainb = isa_inb;
169 archsw.arch_isaoutb = isa_outb;
170 #ifdef LOADER_ZFS_SUPPORT
171 archsw.arch_zfs_probe = i386_zfs_probe;
174 * zfsboot and gptzfsboot have always passed KARGS_FLAGS_ZFS, so if that is
175 * set along with KARGS_FLAGS_EXTARG we know we can interpret the extarg
176 * data as a struct zfs_boot_args.
178 #define KARGS_EXTARGS_ZFS (KARGS_FLAGS_EXTARG | KARGS_FLAGS_ZFS)
180 if ((kargs->bootflags & KARGS_EXTARGS_ZFS) == KARGS_EXTARGS_ZFS) {
181 zargs = (struct zfs_boot_args *)(kargs + 1);
183 #endif /* LOADER_ZFS_SUPPORT */
185 #ifdef LOADER_GELI_SUPPORT
187 * If we decided earlier that we have zfs_boot_args extarg data, and it is
188 * big enough to contain the embedded geli data (the early zfs_boot_args
189 * structs weren't), then init the gbdata pointer accordingly. If there is
190 * extarg data which isn't zfs_boot_args data, determine whether it is
191 * geli_boot_args data. Recent versions of gptboot set KARGS_FLAGS_GELI to
192 * indicate that. Earlier versions didn't, but we presume that's what we
193 * have if the extarg size exactly matches the size of the geli_boot_args
194 * struct during that pre-flag era.
196 #define LEGACY_GELI_ARGS_SIZE 260 /* This can never change */
198 #ifdef LOADER_ZFS_SUPPORT
200 if (zargs->size > offsetof(struct zfs_boot_args, gelidata)) {
201 gbdata = &zargs->gelidata;
204 #endif /* LOADER_ZFS_SUPPORT */
205 if ((kargs->bootflags & KARGS_FLAGS_EXTARG) != 0) {
206 gargs = (struct geli_boot_args *)(kargs + 1);
207 if ((kargs->bootflags & KARGS_FLAGS_GELI) ||
208 gargs->size == LEGACY_GELI_ARGS_SIZE) {
209 gbdata = &gargs->gelidata;
214 import_geli_boot_data(gbdata);
215 #endif /* LOADER_GELI_SUPPORT */
218 * March through the device switch probing for things.
220 for (i = 0; devsw[i] != NULL; i++)
221 if (devsw[i]->dv_init != NULL)
222 (devsw[i]->dv_init)();
223 printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024);
224 if (initial_bootinfo != NULL) {
225 initial_bootinfo->bi_basemem = bios_basemem / 1024;
226 initial_bootinfo->bi_extmem = bios_extmem / 1024;
229 /* detect ACPI for future reference */
232 /* detect SMBIOS for future reference */
235 /* detect PCI BIOS for future reference */
238 printf("\n%s", bootprog_info);
240 extract_currdev(); /* set $currdev and $loaddev */
241 setenv("LINES", "24", 1); /* optional */
247 /* if we ever get here, it is an error */
252 * Set the 'current device' by (if possible) recovering the boot device as
253 * supplied by the initial bootstrap.
255 * XXX should be extended for netbooting.
258 extract_currdev(void)
260 struct i386_devdesc new_currdev;
261 #ifdef LOADER_ZFS_SUPPORT
266 /* Assume we are booting from a BIOS disk by default */
267 new_currdev.dd.d_dev = &biosdisk;
269 /* new-style boot loaders such as pxeldr and cdldr */
270 if (kargs->bootinfo == 0) {
271 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) {
272 /* we are booting from a CD with cdboot */
273 new_currdev.dd.d_dev = &bioscd;
274 new_currdev.dd.d_unit = bc_bios2unit(initial_bootdev);
275 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) {
276 /* we are booting from pxeldr */
277 new_currdev.dd.d_dev = &pxedisk;
278 new_currdev.dd.d_unit = 0;
280 /* we don't know what our boot device is */
281 new_currdev.d_kind.biosdisk.slice = -1;
282 new_currdev.d_kind.biosdisk.partition = 0;
285 #ifdef LOADER_ZFS_SUPPORT
286 } else if ((kargs->bootflags & KARGS_FLAGS_ZFS) != 0) {
287 /* zargs was set in main() if we have new style extended argument */
289 zargs->size >= offsetof(struct zfs_boot_args, primary_pool)) {
290 /* sufficient data is provided */
291 new_currdev.d_kind.zfs.pool_guid = zargs->pool;
292 new_currdev.d_kind.zfs.root_guid = zargs->root;
293 if (zargs->size >= sizeof(*zargs) && zargs->primary_vdev != 0) {
294 sprintf(buf, "%llu", zargs->primary_pool);
295 setenv("vfs.zfs.boot.primary_pool", buf, 1);
296 sprintf(buf, "%llu", zargs->primary_vdev);
297 setenv("vfs.zfs.boot.primary_vdev", buf, 1);
300 /* old style zfsboot block */
301 new_currdev.d_kind.zfs.pool_guid = kargs->zfspool;
302 new_currdev.d_kind.zfs.root_guid = 0;
304 new_currdev.dd.d_dev = &zfs_dev;
306 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) {
307 /* The passed-in boot device is bad */
308 new_currdev.d_kind.biosdisk.slice = -1;
309 new_currdev.d_kind.biosdisk.partition = 0;
312 new_currdev.d_kind.biosdisk.slice = B_SLICE(initial_bootdev) - 1;
313 new_currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev);
314 biosdev = initial_bootinfo->bi_bios_dev;
317 * If we are booted by an old bootstrap, we have to guess at the BIOS
318 * unit number. We will lose if there is more than one disk type
319 * and we are not booting from the lowest-numbered disk type
320 * (ie. SCSI when IDE also exists).
322 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) /* biosdev doesn't match major */
323 biosdev = 0x80 + B_UNIT(initial_bootdev); /* assume harddisk */
327 * If we are booting off of a BIOS disk and we didn't succeed in determining
328 * which one we booted off of, just use disk0: as a reasonable default.
330 if ((new_currdev.dd.d_dev->dv_type == biosdisk.dv_type) &&
331 ((new_currdev.dd.d_unit = bd_bios2unit(biosdev)) == -1)) {
332 printf("Can't work out which disk we are booting from.\n"
333 "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev);
334 new_currdev.dd.d_unit = 0;
337 #ifdef LOADER_ZFS_SUPPORT
338 if (new_currdev.dd.d_dev->dv_type == DEVT_ZFS)
339 init_zfs_bootenv(zfs_fmtdev(&new_currdev));
342 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev),
343 i386_setcurrdev, env_nounset);
344 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), env_noset,
348 COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot);
351 command_reboot(int argc, char *argv[])
355 for (i = 0; devsw[i] != NULL; ++i)
356 if (devsw[i]->dv_cleanup != NULL)
357 (devsw[i]->dv_cleanup)();
359 printf("Rebooting...\n");
364 /* provide this for panic, as it's not in the startup code */
371 COMMAND_SET(heap, "heap", "show heap usage", command_heap);
374 command_heap(int argc, char *argv[])
377 printf("heap base at %p, top at %p, upper limit at %p\n", heap_bottom,
382 /* ISA bus access functions for PnP. */
391 isa_outb(int port, int value)
397 #ifdef LOADER_ZFS_SUPPORT
405 * Open all the disks we can find and see if we can reconstruct
406 * ZFS pools from them.
408 for (unit = 0; unit < MAXBDDEV; unit++) {
409 if (bd_unit2bios(unit) == -1)
411 sprintf(devname, "disk%d:", unit);
412 zfs_probe_dev(devname, NULL);