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 <sys/param.h>
41 #include <sys/reboot.h>
43 #include "bootstrap.h"
44 #include "common/bootargs.h"
45 #include "libi386/libi386.h"
46 #include "libpc98/libpc98.h"
49 CTASSERT(sizeof(struct bootargs) == BOOTARGS_SIZE);
50 CTASSERT(offsetof(struct bootargs, bootinfo) == BA_BOOTINFO);
51 CTASSERT(offsetof(struct bootargs, bootflags) == BA_BOOTFLAGS);
52 CTASSERT(offsetof(struct bootinfo, bi_size) == BI_SIZE);
54 /* Arguments passed in from the boot1/boot2 loader */
55 static struct bootargs *kargs;
57 static u_int32_t initial_howto;
58 static u_int32_t initial_bootdev;
59 static struct bootinfo *initial_bootinfo;
61 struct arch_switch archsw; /* MI/MD interface boundary */
63 static void extract_currdev(void);
64 static int isa_inb(int port);
65 static void isa_outb(int port, int value);
69 extern char bootprog_info[];
74 static void *heap_top;
75 static void *heap_bottom;
78 pc98_loadaddr(u_int type, void *data, uint64_t addr)
83 return (roundup(addr, PAGE_SIZE));
85 /* We cannot use 15M-16M area on pc98. */
86 if (type == LOAD_RAW && addr < 0x1000000 && stat(data, &st) == 0 &&
87 (st.st_size == -1 || addr + st.st_size > 0xf00000))
97 /* Set machine type to PC98_SYSTEM_PARAMETER. */
100 /* Pick up arguments */
101 kargs = (void *)__args;
102 initial_howto = kargs->howto;
103 initial_bootdev = kargs->bootdev;
104 initial_bootinfo = kargs->bootinfo ? (struct bootinfo *)PTOV(kargs->bootinfo) : NULL;
106 /* Initialize the v86 register set to a known-good state. */
107 bzero(&v86, sizeof(v86));
108 v86.efl = PSL_RESERVED_DEFAULT | PSL_I;
111 * Initialise the heap as early as possible. Once this is done, malloc() is usable.
115 #if defined(LOADER_BZIP2_SUPPORT)
116 if (high_heap_size > 0) {
117 heap_top = PTOV(high_heap_base + high_heap_size);
118 heap_bottom = PTOV(high_heap_base);
119 if (high_heap_base < memtop_copyin)
120 memtop_copyin = high_heap_base;
124 heap_top = (void *)PTOV(bios_basemem);
125 heap_bottom = (void *)end;
127 setheap(heap_bottom, heap_top);
130 * XXX Chicken-and-egg problem; we want to have console output early, but some
131 * console attributes may depend on reading from eg. the boot device, which we
134 * We can use printf() etc. once this is done.
135 * If the previous boot stage has requested a serial console, prefer that.
137 bi_setboothowto(initial_howto);
138 if (initial_howto & RB_MULTIPLE) {
139 if (initial_howto & RB_SERIAL)
140 setenv("console", "comconsole vidconsole", 1);
142 setenv("console", "vidconsole comconsole", 1);
143 } else if (initial_howto & RB_SERIAL)
144 setenv("console", "comconsole", 1);
145 else if (initial_howto & RB_MUTE)
146 setenv("console", "nullconsole", 1);
150 * Initialise the block cache. Set the upper limit.
152 bcache_init(32768, 512);
155 * Special handling for PXE and CD booting.
157 if (kargs->bootinfo == 0) {
159 * We only want the PXE disk to try to init itself in the below
160 * walk through devsw if we actually booted off of PXE.
162 if (kargs->bootflags & KARGS_FLAGS_PXE)
163 pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL);
164 else if (kargs->bootflags & KARGS_FLAGS_CD)
165 bc_add(initial_bootdev);
168 archsw.arch_autoload = i386_autoload;
169 archsw.arch_getdev = i386_getdev;
170 archsw.arch_copyin = i386_copyin;
171 archsw.arch_copyout = i386_copyout;
172 archsw.arch_readin = i386_readin;
173 archsw.arch_isainb = isa_inb;
174 archsw.arch_isaoutb = isa_outb;
175 archsw.arch_loadaddr = pc98_loadaddr;
178 * March through the device switch probing for things.
180 for (i = 0; devsw[i] != NULL; i++)
181 if (devsw[i]->dv_init != NULL)
182 (devsw[i]->dv_init)();
183 printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024);
184 if (initial_bootinfo != NULL) {
185 initial_bootinfo->bi_basemem = bios_basemem / 1024;
186 initial_bootinfo->bi_extmem = bios_extmem / 1024;
189 printf("\n%s", bootprog_info);
191 extract_currdev(); /* set $currdev and $loaddev */
192 setenv("LINES", "24", 1); /* optional */
194 interact(NULL); /* doesn't return */
196 /* if we ever get here, it is an error */
201 * Set the 'current device' by (if possible) recovering the boot device as
202 * supplied by the initial bootstrap.
204 * XXX should be extended for netbooting.
207 extract_currdev(void)
209 struct i386_devdesc new_currdev;
213 /* Assume we are booting from a BIOS disk by default */
214 new_currdev.d_dev = &biosdisk;
216 /* new-style boot loaders such as pxeldr and cdldr */
217 if (kargs->bootinfo == 0) {
218 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) {
219 /* we are booting from a CD with cdboot */
220 new_currdev.d_dev = &bioscd;
221 new_currdev.d_unit = bc_bios2unit(initial_bootdev);
222 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) {
223 /* we are booting from pxeldr */
224 new_currdev.d_dev = &pxedisk;
225 new_currdev.d_unit = 0;
227 /* we don't know what our boot device is */
228 new_currdev.d_kind.biosdisk.slice = -1;
229 new_currdev.d_kind.biosdisk.partition = 0;
232 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) {
233 /* The passed-in boot device is bad */
234 new_currdev.d_kind.biosdisk.slice = -1;
235 new_currdev.d_kind.biosdisk.partition = 0;
238 new_currdev.d_kind.biosdisk.slice = B_SLICE(initial_bootdev) - 1;
239 new_currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev);
240 biosdev = initial_bootinfo->bi_bios_dev;
241 major = B_TYPE(initial_bootdev);
244 * If we are booted by an old bootstrap, we have to guess at the BIOS
245 * unit number. We will lose if there is more than one disk type
246 * and we are not booting from the lowest-numbered disk type
247 * (ie. SCSI when IDE also exists).
249 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) { /* biosdev doesn't match major */
250 if (B_TYPE(initial_bootdev) == 6)
251 biosdev = 0x30 + B_UNIT(initial_bootdev);
253 biosdev = (major << 3) + 0x80 + B_UNIT(initial_bootdev);
256 new_currdev.d_type = new_currdev.d_dev->dv_type;
259 * If we are booting off of a BIOS disk and we didn't succeed in determining
260 * which one we booted off of, just use disk0: as a reasonable default.
262 if ((new_currdev.d_type == biosdisk.dv_type) &&
263 ((new_currdev.d_unit = bd_bios2unit(biosdev)) == -1)) {
264 printf("Can't work out which disk we are booting from.\n"
265 "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev);
266 new_currdev.d_unit = 0;
269 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev),
270 i386_setcurrdev, env_nounset);
271 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), env_noset,
275 COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot);
278 command_reboot(int argc, char *argv[])
282 for (i = 0; devsw[i] != NULL; ++i)
283 if (devsw[i]->dv_cleanup != NULL)
284 (devsw[i]->dv_cleanup)();
286 printf("Rebooting...\n");
291 /* provide this for panic, as it's not in the startup code */
298 COMMAND_SET(heap, "heap", "show heap usage", command_heap);
301 command_heap(int argc, char *argv[])
304 printf("heap base at %p, top at %p, upper limit at %p\n", heap_bottom,
309 /* ISA bus access functions for PnP. */
318 isa_outb(int port, int value)