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/param.h>
40 #include <sys/reboot.h>
42 #include "bootstrap.h"
43 #include "libi386/libi386.h"
44 #include "libpc98/libpc98.h"
47 #define KARGS_FLAGS_CD 0x1
48 #define KARGS_FLAGS_PXE 0x2
50 /* Arguments passed in from the boot1/boot2 loader */
61 static u_int32_t initial_howto;
62 static u_int32_t initial_bootdev;
63 static struct bootinfo *initial_bootinfo;
65 struct arch_switch archsw; /* MI/MD interface boundary */
67 static void extract_currdev(void);
68 static int isa_inb(int port);
69 static void isa_outb(int port, int value);
73 extern char bootprog_name[], bootprog_rev[], bootprog_date[], bootprog_maker[];
78 static void *heap_top;
79 static void *heap_bottom;
82 pc98_loadaddr(u_int type, void *data, uint64_t addr)
87 return (roundup(addr, PAGE_SIZE));
89 /* We cannot use 15M-16M area on pc98. */
90 if (type == LOAD_RAW && addr < 0x1000000 && stat(data, &st) == 0 &&
91 (st.st_size == -1 || addr + st.st_size > 0xf00000))
101 /* Set machine type to PC98_SYSTEM_PARAMETER. */
104 /* Pick up arguments */
105 kargs = (void *)__args;
106 initial_howto = kargs->howto;
107 initial_bootdev = kargs->bootdev;
108 initial_bootinfo = kargs->bootinfo ? (struct bootinfo *)PTOV(kargs->bootinfo) : NULL;
110 /* Initialize the v86 register set to a known-good state. */
111 bzero(&v86, sizeof(v86));
112 v86.efl = PSL_RESERVED_DEFAULT | PSL_I;
115 * Initialise the heap as early as possible. Once this is done, malloc() is usable.
119 #if defined(LOADER_BZIP2_SUPPORT)
120 if (high_heap_size > 0) {
121 heap_top = PTOV(high_heap_base + high_heap_size);
122 heap_bottom = PTOV(high_heap_base);
123 if (high_heap_base < memtop_copyin)
124 memtop_copyin = high_heap_base;
128 heap_top = (void *)PTOV(bios_basemem);
129 heap_bottom = (void *)end;
131 setheap(heap_bottom, heap_top);
134 * XXX Chicken-and-egg problem; we want to have console output early, but some
135 * console attributes may depend on reading from eg. the boot device, which we
138 * We can use printf() etc. once this is done.
139 * If the previous boot stage has requested a serial console, prefer that.
141 bi_setboothowto(initial_howto);
142 if (initial_howto & RB_MULTIPLE) {
143 if (initial_howto & RB_SERIAL)
144 setenv("console", "comconsole vidconsole", 1);
146 setenv("console", "vidconsole comconsole", 1);
147 } else if (initial_howto & RB_SERIAL)
148 setenv("console", "comconsole", 1);
149 else if (initial_howto & RB_MUTE)
150 setenv("console", "nullconsole", 1);
154 * Initialise the block cache
156 bcache_init(32, 512); /* 16k cache XXX tune this */
159 * Special handling for PXE and CD booting.
161 if (kargs->bootinfo == 0) {
163 * We only want the PXE disk to try to init itself in the below
164 * walk through devsw if we actually booted off of PXE.
166 if (kargs->bootflags & KARGS_FLAGS_PXE)
167 pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL);
168 else if (kargs->bootflags & KARGS_FLAGS_CD)
169 bc_add(initial_bootdev);
172 archsw.arch_autoload = i386_autoload;
173 archsw.arch_getdev = i386_getdev;
174 archsw.arch_copyin = i386_copyin;
175 archsw.arch_copyout = i386_copyout;
176 archsw.arch_readin = i386_readin;
177 archsw.arch_isainb = isa_inb;
178 archsw.arch_isaoutb = isa_outb;
179 archsw.arch_loadaddr = pc98_loadaddr;
182 * March through the device switch probing for things.
184 for (i = 0; devsw[i] != NULL; i++)
185 if (devsw[i]->dv_init != NULL)
186 (devsw[i]->dv_init)();
187 printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024);
188 if (initial_bootinfo != NULL) {
189 initial_bootinfo->bi_basemem = bios_basemem / 1024;
190 initial_bootinfo->bi_extmem = bios_extmem / 1024;
194 printf("%s, Revision %s\n", bootprog_name, bootprog_rev);
195 printf("(%s, %s)\n", bootprog_maker, bootprog_date);
197 extract_currdev(); /* set $currdev and $loaddev */
198 setenv("LINES", "24", 1); /* optional */
200 interact(); /* doesn't return */
202 /* if we ever get here, it is an error */
207 * Set the 'current device' by (if possible) recovering the boot device as
208 * supplied by the initial bootstrap.
210 * XXX should be extended for netbooting.
213 extract_currdev(void)
215 struct i386_devdesc new_currdev;
219 /* Assume we are booting from a BIOS disk by default */
220 new_currdev.d_dev = &biosdisk;
222 /* new-style boot loaders such as pxeldr and cdldr */
223 if (kargs->bootinfo == 0) {
224 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) {
225 /* we are booting from a CD with cdboot */
226 new_currdev.d_dev = &bioscd;
227 new_currdev.d_unit = bc_bios2unit(initial_bootdev);
228 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) {
229 /* we are booting from pxeldr */
230 new_currdev.d_dev = &pxedisk;
231 new_currdev.d_unit = 0;
233 /* we don't know what our boot device is */
234 new_currdev.d_kind.biosdisk.slice = -1;
235 new_currdev.d_kind.biosdisk.partition = 0;
238 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) {
239 /* The passed-in boot device is bad */
240 new_currdev.d_kind.biosdisk.slice = -1;
241 new_currdev.d_kind.biosdisk.partition = 0;
244 new_currdev.d_kind.biosdisk.slice = B_SLICE(initial_bootdev) - 1;
245 new_currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev);
246 biosdev = initial_bootinfo->bi_bios_dev;
247 major = B_TYPE(initial_bootdev);
250 * If we are booted by an old bootstrap, we have to guess at the BIOS
251 * unit number. We will lose if there is more than one disk type
252 * and we are not booting from the lowest-numbered disk type
253 * (ie. SCSI when IDE also exists).
255 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) { /* biosdev doesn't match major */
256 if (B_TYPE(initial_bootdev) == 6)
257 biosdev = 0x30 + B_UNIT(initial_bootdev);
259 biosdev = (major << 3) + 0x80 + B_UNIT(initial_bootdev);
262 new_currdev.d_type = new_currdev.d_dev->dv_type;
265 * If we are booting off of a BIOS disk and we didn't succeed in determining
266 * which one we booted off of, just use disk0: as a reasonable default.
268 if ((new_currdev.d_type == biosdisk.dv_type) &&
269 ((new_currdev.d_unit = bd_bios2unit(biosdev)) == -1)) {
270 printf("Can't work out which disk we are booting from.\n"
271 "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev);
272 new_currdev.d_unit = 0;
274 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev),
275 i386_setcurrdev, env_nounset);
276 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), env_noset,
280 COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot);
283 command_reboot(int argc, char *argv[])
287 for (i = 0; devsw[i] != NULL; ++i)
288 if (devsw[i]->dv_cleanup != NULL)
289 (devsw[i]->dv_cleanup)();
291 printf("Rebooting...\n");
296 /* provide this for panic, as it's not in the startup code */
303 COMMAND_SET(heap, "heap", "show heap usage", command_heap);
306 command_heap(int argc, char *argv[])
309 printf("heap base at %p, top at %p, upper limit at %p\n", heap_bottom,
314 /* ISA bus access functions for PnP, derived from <machine/cpufunc.h> */
320 if (__builtin_constant_p(port) &&
321 (((port) & 0xffff) < 0x100) &&
322 ((port) < 0x10000)) {
323 __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port)));
325 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
331 isa_outb(int port, int value)
335 if (__builtin_constant_p(port) &&
336 (((port) & 0xffff) < 0x100) &&
337 ((port) < 0x10000)) {
338 __asm __volatile("outb %0,%1" : : "a" (al), "id" ((u_short)(port)));
340 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));