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
48 /* Arguments passed in from the boot1/boot2 loader */
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);
71 extern char bootprog_name[], bootprog_rev[], bootprog_date[], bootprog_maker[];
76 static void *heap_top;
77 static void *heap_bottom;
84 /* Pick up arguments */
85 kargs = (void *)__args;
86 initial_howto = kargs->howto;
87 initial_bootdev = kargs->bootdev;
88 initial_bootinfo = kargs->bootinfo ? (struct bootinfo *)PTOV(kargs->bootinfo) : NULL;
90 /* Initialize the v86 register set to a known-good state. */
91 bzero(&v86, sizeof(v86));
92 v86.efl = PSL_RESERVED_DEFAULT | PSL_I;
95 * Initialise the heap as early as possible. Once this is done, malloc() is usable.
99 #if defined(LOADER_BZIP2_SUPPORT) || defined(LOADER_FIREWIRE_SUPPORT) || defined(LOADER_GPT_SUPPORT)
100 heap_top = PTOV(memtop_copyin);
101 memtop_copyin -= 0x300000;
102 heap_bottom = PTOV(memtop_copyin);
104 heap_top = (void *)bios_basemem;
105 heap_bottom = (void *)end;
107 setheap(heap_bottom, heap_top);
110 * XXX Chicken-and-egg problem; we want to have console output early, but some
111 * console attributes may depend on reading from eg. the boot device, which we
114 * We can use printf() etc. once this is done.
115 * If the previous boot stage has requested a serial console, prefer that.
117 bi_setboothowto(initial_howto);
118 if (initial_howto & RB_MULTIPLE) {
119 if (initial_howto & RB_SERIAL)
120 setenv("console", "comconsole vidconsole", 1);
122 setenv("console", "vidconsole comconsole", 1);
123 } else if (initial_howto & RB_SERIAL)
124 setenv("console", "comconsole", 1);
125 else if (initial_howto & RB_MUTE)
126 setenv("console", "nullconsole", 1);
130 * Initialise the block cache
132 bcache_init(32, 512); /* 16k cache XXX tune this */
135 * Special handling for PXE and CD booting.
137 if (kargs->bootinfo == 0) {
139 * We only want the PXE disk to try to init itself in the below
140 * walk through devsw if we actually booted off of PXE.
142 if (kargs->bootflags & KARGS_FLAGS_PXE)
143 pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL);
144 else if (kargs->bootflags & KARGS_FLAGS_CD)
145 bc_add(initial_bootdev);
149 * March through the device switch probing for things.
151 for (i = 0; devsw[i] != NULL; i++)
152 if (devsw[i]->dv_init != NULL)
153 (devsw[i]->dv_init)();
154 printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024);
155 if (initial_bootinfo != NULL) {
156 initial_bootinfo->bi_basemem = bios_basemem / 1024;
157 initial_bootinfo->bi_extmem = bios_extmem / 1024;
160 /* detect ACPI for future reference */
163 /* detect SMBIOS for future reference */
167 printf("%s, Revision %s\n", bootprog_name, bootprog_rev);
168 printf("(%s, %s)\n", bootprog_maker, bootprog_date);
170 extract_currdev(); /* set $currdev and $loaddev */
171 setenv("LINES", "24", 1); /* optional */
175 archsw.arch_autoload = i386_autoload;
176 archsw.arch_getdev = i386_getdev;
177 archsw.arch_copyin = i386_copyin;
178 archsw.arch_copyout = i386_copyout;
179 archsw.arch_readin = i386_readin;
180 archsw.arch_isainb = isa_inb;
181 archsw.arch_isaoutb = isa_outb;
183 interact(); /* doesn't return */
185 /* if we ever get here, it is an error */
190 * Set the 'current device' by (if possible) recovering the boot device as
191 * supplied by the initial bootstrap.
193 * XXX should be extended for netbooting.
196 extract_currdev(void)
198 struct i386_devdesc new_currdev;
201 /* Assume we are booting from a BIOS disk by default */
202 new_currdev.d_dev = &biosdisk;
204 /* new-style boot loaders such as pxeldr and cdldr */
205 if (kargs->bootinfo == 0) {
206 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) {
207 /* we are booting from a CD with cdboot */
208 new_currdev.d_dev = &bioscd;
209 new_currdev.d_unit = bc_bios2unit(initial_bootdev);
210 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) {
211 /* we are booting from pxeldr */
212 new_currdev.d_dev = &pxedisk;
213 new_currdev.d_unit = 0;
215 /* we don't know what our boot device is */
216 new_currdev.d_kind.biosdisk.slice = -1;
217 new_currdev.d_kind.biosdisk.partition = 0;
220 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) {
221 /* The passed-in boot device is bad */
222 new_currdev.d_kind.biosdisk.slice = -1;
223 new_currdev.d_kind.biosdisk.partition = 0;
226 new_currdev.d_kind.biosdisk.slice = B_SLICE(initial_bootdev) - 1;
227 new_currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev);
228 biosdev = initial_bootinfo->bi_bios_dev;
231 * If we are booted by an old bootstrap, we have to guess at the BIOS
232 * unit number. We will lose if there is more than one disk type
233 * and we are not booting from the lowest-numbered disk type
234 * (ie. SCSI when IDE also exists).
236 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) /* biosdev doesn't match major */
237 biosdev = 0x80 + B_UNIT(initial_bootdev); /* assume harddisk */
239 new_currdev.d_type = new_currdev.d_dev->dv_type;
242 * If we are booting off of a BIOS disk and we didn't succeed in determining
243 * which one we booted off of, just use disk0: as a reasonable default.
245 if ((new_currdev.d_type == biosdisk.dv_type) &&
246 ((new_currdev.d_unit = bd_bios2unit(biosdev)) == -1)) {
247 printf("Can't work out which disk we are booting from.\n"
248 "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev);
249 new_currdev.d_unit = 0;
251 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev),
252 i386_setcurrdev, env_nounset);
253 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), env_noset,
257 COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot);
260 command_reboot(int argc, char *argv[])
264 for (i = 0; devsw[i] != NULL; ++i)
265 if (devsw[i]->dv_cleanup != NULL)
266 (devsw[i]->dv_cleanup)();
268 printf("Rebooting...\n");
273 /* provide this for panic, as it's not in the startup code */
280 COMMAND_SET(heap, "heap", "show heap usage", command_heap);
283 command_heap(int argc, char *argv[])
286 printf("heap base at %p, top at %p, upper limit at %p\n", heap_bottom,
291 /* ISA bus access functions for PnP, derived from <machine/cpufunc.h> */
297 if (__builtin_constant_p(port) &&
298 (((port) & 0xffff) < 0x100) &&
299 ((port) < 0x10000)) {
300 __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port)));
302 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
308 isa_outb(int port, int value)
312 if (__builtin_constant_p(port) &&
313 (((port) & 0xffff) < 0x100) &&
314 ((port) < 0x10000)) {
315 __asm __volatile("outb %0,%1" : : "a" (al), "id" ((u_short)(port)));
317 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));