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>
30 * MD bootstrap main() and assorted miscellaneous
37 #include <machine/bootinfo.h>
38 #include <machine/cpufunc.h>
39 #include <machine/psl.h>
41 #include <sys/param.h>
42 #include <sys/reboot.h>
44 #include "bootstrap.h"
45 #include "common/bootargs.h"
46 #include "libi386/libi386.h"
47 #include "libi386/smbios.h"
51 CTASSERT(sizeof(struct bootargs
) == BOOTARGS_SIZE
);
52 CTASSERT(offsetof(struct bootargs
, bootinfo
) == BA_BOOTINFO
);
53 CTASSERT(offsetof(struct bootargs
, bootflags
) == BA_BOOTFLAGS
);
54 CTASSERT(offsetof(struct bootinfo
, bi_size
) == BI_SIZE
);
56 /* Arguments passed in from the boot1/boot2 loader */
57 static struct bootargs
*kargs
;
59 static u_int32_t initial_howto
;
60 static u_int32_t initial_bootdev
;
61 static struct bootinfo
*initial_bootinfo
;
63 struct arch_switch archsw
; /* MI/MD interface boundary */
65 static void extract_currdev(void);
66 static int isa_inb(int port
);
67 static void isa_outb(int port
, int value
);
69 static void i386_zfs_probe(void);
74 static void *heap_top
;
75 static void *heap_bottom
;
82 /* Pick up arguments */
83 kargs
= (void *)__args
;
84 initial_howto
= kargs
->howto
;
85 initial_bootdev
= kargs
->bootdev
;
86 initial_bootinfo
= kargs
->bootinfo
? (struct bootinfo
*)PTOV(kargs
->bootinfo
) : NULL
;
88 /* Initialize the v86 register set to a known-good state. */
89 bzero(&v86
, sizeof(v86
));
90 v86
.efl
= PSL_RESERVED_DEFAULT
| PSL_I
;
93 * Initialise the heap as early as possible. Once this is done, malloc() is usable.
97 if (high_heap_size
> 0) {
98 heap_top
= PTOV(high_heap_base
+ high_heap_size
);
99 heap_bottom
= PTOV(high_heap_base
);
100 if (high_heap_base
< memtop_copyin
)
101 memtop_copyin
= high_heap_base
;
103 heap_top
= (void *)PTOV(bios_basemem
);
104 heap_bottom
= (void *)end
;
106 setheap(heap_bottom
, heap_top
);
109 * XXX Chicken-and-egg problem; we want to have console output early, but some
110 * console attributes may depend on reading from eg. the boot device, which we
113 * We can use printf() etc. once this is done.
114 * If the previous boot stage has requested a serial console, prefer that.
116 bi_setboothowto(initial_howto
);
117 if (initial_howto
& RB_MULTIPLE
) {
118 if (initial_howto
& RB_SERIAL
)
119 setenv("console", "ttya text", 1);
121 setenv("console", "text ttya", 1);
122 } else if (initial_howto
& RB_SERIAL
)
123 setenv("console", "ttya", 1);
124 else if (initial_howto
& RB_MUTE
)
125 setenv("console", "null", 1);
129 * Initialise the block cache. Set the upper limit.
131 bcache_init(32768, 512);
134 * Special handling for PXE and CD booting.
136 if (kargs
->bootinfo
== 0) {
138 * We only want the PXE disk to try to init itself in the below
139 * walk through devsw if we actually booted off of PXE.
141 if (kargs
->bootflags
& KARGS_FLAGS_PXE
)
142 pxe_enable(kargs
->pxeinfo
? PTOV(kargs
->pxeinfo
) : NULL
);
143 else if (kargs
->bootflags
& KARGS_FLAGS_CD
)
144 bc_add(initial_bootdev
);
147 archsw
.arch_autoload
= i386_autoload
;
148 archsw
.arch_getdev
= i386_getdev
;
149 archsw
.arch_copyin
= i386_copyin
;
150 archsw
.arch_copyout
= i386_copyout
;
151 archsw
.arch_readin
= i386_readin
;
152 archsw
.arch_isainb
= isa_inb
;
153 archsw
.arch_isaoutb
= isa_outb
;
154 archsw
.arch_loadaddr
= i386_loadaddr
;
155 archsw
.arch_zfs_probe
= i386_zfs_probe
;
158 * March through the device switch probing for things.
160 for (i
= 0; devsw
[i
] != NULL
; i
++)
161 if (devsw
[i
]->dv_init
!= NULL
)
162 (devsw
[i
]->dv_init
)();
164 printf("BIOS %dkB/%dkB available memory\n", bios_basemem
/ 1024, bios_extmem
/ 1024);
165 if (initial_bootinfo
!= NULL
) {
166 initial_bootinfo
->bi_basemem
= bios_basemem
/ 1024;
167 initial_bootinfo
->bi_extmem
= bios_extmem
/ 1024;
170 /* detect ACPI for future reference */
173 /* detect SMBIOS for future reference */
176 /* detect PCI BIOS for future reference */
179 printf("\n%s", bootprog_info
);
181 extract_currdev(); /* set $currdev and $loaddev */
182 autoload_font(); /* Set up the font list for console. */
189 /* if we ever get here, it is an error */
194 * Set the 'current device' by (if possible) recovering the boot device as
195 * supplied by the initial bootstrap.
197 * XXX should be extended for netbooting.
200 extract_currdev(void)
202 struct i386_devdesc new_currdev
;
203 struct zfs_boot_args
*zargs
;
206 /* Assume we are booting from a BIOS disk by default */
207 new_currdev
.dd
.d_dev
= &bioshd
;
209 /* new-style boot loaders such as pxeldr and cdldr */
210 if (kargs
->bootinfo
== 0) {
211 if ((kargs
->bootflags
& KARGS_FLAGS_CD
) != 0) {
212 /* we are booting from a CD with cdboot */
213 new_currdev
.dd
.d_dev
= &bioscd
;
214 new_currdev
.dd
.d_unit
= bd_bios2unit(initial_bootdev
);
215 } else if ((kargs
->bootflags
& KARGS_FLAGS_PXE
) != 0) {
216 /* we are booting from pxeldr */
217 new_currdev
.dd
.d_dev
= &pxedisk
;
218 new_currdev
.dd
.d_unit
= 0;
220 /* we don't know what our boot device is */
221 new_currdev
.d_kind
.biosdisk
.slice
= -1;
222 new_currdev
.d_kind
.biosdisk
.partition
= 0;
225 } else if ((kargs
->bootflags
& KARGS_FLAGS_ZFS
) != 0) {
227 /* check for new style extended argument */
228 if ((kargs
->bootflags
& KARGS_FLAGS_EXTARG
) != 0)
229 zargs
= (struct zfs_boot_args
*)(kargs
+ 1);
232 zargs
->size
>= offsetof(struct zfs_boot_args
, primary_pool
)) {
233 /* sufficient data is provided */
234 new_currdev
.d_kind
.zfs
.pool_guid
= zargs
->pool
;
235 new_currdev
.d_kind
.zfs
.root_guid
= zargs
->root
;
237 /* old style zfsboot block */
238 new_currdev
.d_kind
.zfs
.pool_guid
= kargs
->zfspool
;
239 new_currdev
.d_kind
.zfs
.root_guid
= 0;
241 new_currdev
.dd
.d_dev
= &zfs_dev
;
242 } else if ((initial_bootdev
& B_MAGICMASK
) != B_DEVMAGIC
) {
243 /* The passed-in boot device is bad */
244 new_currdev
.d_kind
.biosdisk
.slice
= -1;
245 new_currdev
.d_kind
.biosdisk
.partition
= 0;
248 new_currdev
.d_kind
.biosdisk
.slice
= B_SLICE(initial_bootdev
) - 1;
249 new_currdev
.d_kind
.biosdisk
.partition
= B_PARTITION(initial_bootdev
);
250 biosdev
= initial_bootinfo
->bi_bios_dev
;
253 * If we are booted by an old bootstrap, we have to guess at the BIOS
254 * unit number. We will lose if there is more than one disk type
255 * and we are not booting from the lowest-numbered disk type
256 * (ie. SCSI when IDE also exists).
258 if ((biosdev
== 0) && (B_TYPE(initial_bootdev
) != 2)) /* biosdev doesn't match major */
259 biosdev
= 0x80 + B_UNIT(initial_bootdev
); /* assume harddisk */
263 * If we are booting off of a BIOS disk and we didn't succeed in determining
264 * which one we booted off of, just use disk0: as a reasonable default.
266 if ((new_currdev
.dd
.d_dev
->dv_type
== bioshd
.dv_type
) &&
267 ((new_currdev
.dd
.d_unit
= bd_bios2unit(biosdev
)) == -1)) {
268 printf("Can't work out which disk we are booting from.\n"
269 "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev
);
270 new_currdev
.dd
.d_unit
= 0;
273 env_setenv("currdev", EV_VOLATILE
, i386_fmtdev(&new_currdev
),
274 i386_setcurrdev
, env_nounset
);
275 env_setenv("loaddev", EV_VOLATILE
, i386_fmtdev(&new_currdev
), env_noset
,
279 COMMAND_SET(reboot
, "reboot", "reboot the system", command_reboot
);
282 command_reboot(int argc
, char *argv
[])
286 for (i
= 0; devsw
[i
] != NULL
; ++i
)
287 if (devsw
[i
]->dv_cleanup
!= NULL
)
288 (devsw
[i
]->dv_cleanup
)();
290 printf("Rebooting...\n");
295 /* provide this for panic, as it's not in the startup code */
302 COMMAND_SET(heap
, "heap", "show heap usage", command_heap
);
305 command_heap(int argc
, char *argv
[])
308 printf("heap base at %p, top at %p, upper limit at %p\n", heap_bottom
,
313 /* ISA bus access functions for PnP. */
322 isa_outb(int port
, int value
)
332 struct i386_devdesc dev
;
335 * Open all the disks we can find and see if we can reconstruct
336 * ZFS pools from them.
338 dev
.dd
.d_dev
= &bioshd
;
339 for (dev
.dd
.d_unit
= 0; bd_unit2bios(&dev
) >= 0; dev
.dd
.d_unit
++) {
340 snprintf(devname
, sizeof (devname
), "%s%d:", bioshd
.dv_name
,
342 zfs_probe_dev(devname
, NULL
);