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
37 #include <machine/bootinfo.h>
38 #include <machine/psl.h>
39 #include <sys/reboot.h>
41 #include "bootstrap.h"
42 #include "libi386/libi386.h"
45 #define KARGS_FLAGS_CD 0x1
46 #define KARGS_FLAGS_PXE 0x2
47 #define KARGS_FLAGS_ZFS 0x4
49 /* Arguments passed in from the boot1/boot2 loader */
65 static u_int32_t initial_howto;
66 static u_int32_t initial_bootdev;
67 static struct bootinfo *initial_bootinfo;
69 struct arch_switch archsw; /* MI/MD interface boundary */
71 static void extract_currdev(void);
72 static int isa_inb(int port);
73 static void isa_outb(int port, int value);
77 extern char bootprog_name[], bootprog_rev[], bootprog_date[], bootprog_maker[];
82 static void *heap_top;
83 static void *heap_bottom;
90 /* Pick up arguments */
91 kargs = (void *)__args;
92 initial_howto = kargs->howto;
93 initial_bootdev = kargs->bootdev;
94 initial_bootinfo = kargs->bootinfo ? (struct bootinfo *)PTOV(kargs->bootinfo) : NULL;
96 /* Initialize the v86 register set to a known-good state. */
97 bzero(&v86, sizeof(v86));
98 v86.efl = PSL_RESERVED_DEFAULT | PSL_I;
101 * Initialise the heap as early as possible. Once this is done, malloc() is usable.
105 #if defined(LOADER_BZIP2_SUPPORT) || defined(LOADER_FIREWIRE_SUPPORT) || defined(LOADER_GPT_SUPPORT) || defined(LOADER_ZFS_SUPPORT)
106 heap_top = PTOV(memtop_copyin);
107 memtop_copyin -= 0x300000;
108 heap_bottom = PTOV(memtop_copyin);
110 heap_top = (void *)bios_basemem;
111 heap_bottom = (void *)end;
113 setheap(heap_bottom, heap_top);
116 * XXX Chicken-and-egg problem; we want to have console output early, but some
117 * console attributes may depend on reading from eg. the boot device, which we
120 * We can use printf() etc. once this is done.
121 * If the previous boot stage has requested a serial console, prefer that.
123 bi_setboothowto(initial_howto);
124 if (initial_howto & RB_MULTIPLE) {
125 if (initial_howto & RB_SERIAL)
126 setenv("console", "comconsole vidconsole", 1);
128 setenv("console", "vidconsole comconsole", 1);
129 } else if (initial_howto & RB_SERIAL)
130 setenv("console", "comconsole", 1);
131 else if (initial_howto & RB_MUTE)
132 setenv("console", "nullconsole", 1);
136 * Initialise the block cache
138 bcache_init(32, 512); /* 16k cache XXX tune this */
141 * Special handling for PXE and CD booting.
143 if (kargs->bootinfo == 0) {
145 * We only want the PXE disk to try to init itself in the below
146 * walk through devsw if we actually booted off of PXE.
148 if (kargs->bootflags & KARGS_FLAGS_PXE)
149 pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL);
150 else if (kargs->bootflags & KARGS_FLAGS_CD)
151 bc_add(initial_bootdev);
154 archsw.arch_autoload = i386_autoload;
155 archsw.arch_getdev = i386_getdev;
156 archsw.arch_copyin = i386_copyin;
157 archsw.arch_copyout = i386_copyout;
158 archsw.arch_readin = i386_readin;
159 archsw.arch_isainb = isa_inb;
160 archsw.arch_isaoutb = isa_outb;
163 * March through the device switch probing for things.
165 for (i = 0; devsw[i] != NULL; i++)
166 if (devsw[i]->dv_init != NULL)
167 (devsw[i]->dv_init)();
168 printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024);
169 if (initial_bootinfo != NULL) {
170 initial_bootinfo->bi_basemem = bios_basemem / 1024;
171 initial_bootinfo->bi_extmem = bios_extmem / 1024;
174 /* detect ACPI for future reference */
177 /* detect SMBIOS for future reference */
181 printf("%s, Revision %s\n", bootprog_name, bootprog_rev);
182 printf("(%s, %s)\n", bootprog_maker, bootprog_date);
184 extract_currdev(); /* set $currdev and $loaddev */
185 setenv("LINES", "24", 1); /* optional */
189 interact(); /* doesn't return */
191 /* if we ever get here, it is an error */
196 * Set the 'current device' by (if possible) recovering the boot device as
197 * supplied by the initial bootstrap.
199 * XXX should be extended for netbooting.
202 extract_currdev(void)
204 struct i386_devdesc new_currdev;
207 /* Assume we are booting from a BIOS disk by default */
208 new_currdev.d_dev = &biosdisk;
210 /* new-style boot loaders such as pxeldr and cdldr */
211 if (kargs->bootinfo == 0) {
212 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) {
213 /* we are booting from a CD with cdboot */
214 new_currdev.d_dev = &bioscd;
215 new_currdev.d_unit = bc_bios2unit(initial_bootdev);
216 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) {
217 /* we are booting from pxeldr */
218 new_currdev.d_dev = &pxedisk;
219 new_currdev.d_unit = 0;
221 /* we don't know what our boot device is */
222 new_currdev.d_kind.biosdisk.slice = -1;
223 new_currdev.d_kind.biosdisk.partition = 0;
226 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) {
227 /* The passed-in boot device is bad */
228 new_currdev.d_kind.biosdisk.slice = -1;
229 new_currdev.d_kind.biosdisk.partition = 0;
232 new_currdev.d_kind.biosdisk.slice = B_SLICE(initial_bootdev) - 1;
233 new_currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev);
234 biosdev = initial_bootinfo->bi_bios_dev;
237 * If we are booted by an old bootstrap, we have to guess at the BIOS
238 * unit number. We will lose if there is more than one disk type
239 * and we are not booting from the lowest-numbered disk type
240 * (ie. SCSI when IDE also exists).
242 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) /* biosdev doesn't match major */
243 biosdev = 0x80 + B_UNIT(initial_bootdev); /* assume harddisk */
245 new_currdev.d_type = new_currdev.d_dev->dv_type;
248 * If we are booting off of a BIOS disk and we didn't succeed in determining
249 * which one we booted off of, just use disk0: as a reasonable default.
251 if ((new_currdev.d_type == biosdisk.dv_type) &&
252 ((new_currdev.d_unit = bd_bios2unit(biosdev)) == -1)) {
253 printf("Can't work out which disk we are booting from.\n"
254 "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev);
255 new_currdev.d_unit = 0;
257 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev),
258 i386_setcurrdev, env_nounset);
259 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), env_noset,
262 #ifdef LOADER_ZFS_SUPPORT
264 * If we were started from a ZFS-aware boot2, we can work out
265 * which ZFS pool we are booting from.
267 if (kargs->bootflags & KARGS_FLAGS_ZFS) {
269 * Dig out the pool guid and convert it to a 'unit number'
274 extern int zfs_guid_to_unit(uint64_t);
276 guid = kargs->zfspool;
277 unit = zfs_guid_to_unit(guid);
279 sprintf(devname, "zfs%d", unit);
280 setenv("currdev", devname, 1);
286 COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot);
289 command_reboot(int argc, char *argv[])
293 for (i = 0; devsw[i] != NULL; ++i)
294 if (devsw[i]->dv_cleanup != NULL)
295 (devsw[i]->dv_cleanup)();
297 printf("Rebooting...\n");
302 /* provide this for panic, as it's not in the startup code */
309 COMMAND_SET(heap, "heap", "show heap usage", command_heap);
312 command_heap(int argc, char *argv[])
315 printf("heap base at %p, top at %p, upper limit at %p\n", heap_bottom,
320 /* ISA bus access functions for PnP, derived from <machine/cpufunc.h> */
326 if (__builtin_constant_p(port) &&
327 (((port) & 0xffff) < 0x100) &&
328 ((port) < 0x10000)) {
329 __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port)));
331 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
337 isa_outb(int port, int value)
341 if (__builtin_constant_p(port) &&
342 (((port) & 0xffff) < 0x100) &&
343 ((port) < 0x10000)) {
344 __asm __volatile("outb %0,%1" : : "a" (al), "id" ((u_short)(port)));
346 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));