main.c revision 67136
1/*- 2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 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. 13 * 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 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: head/sys/boot/pc98/loader/main.c 67136 2000-10-15 02:56:48Z nyan $ 27 */ 28 29/* 30 * MD bootstrap main() and assorted miscellaneous 31 * commands. 32 */ 33 34#include <stand.h> 35#include <string.h> 36#include <machine/bootinfo.h> 37#include <sys/reboot.h> 38 39#include "bootstrap.h" 40#include "libi386/libi386.h" 41#include "btxv86.h" 42 43#define KARGS_FLAGS_CD 0x1 44#define KARGS_FLAGS_PXE 0x2 45 46/* Arguments passed in from the boot1/boot2 loader */ 47static struct 48{ 49 u_int32_t howto; 50 u_int32_t bootdev; 51 u_int32_t bootflags; 52 u_int32_t pxeinfo; 53 u_int32_t res2; 54 u_int32_t bootinfo; 55} *kargs; 56 57static u_int32_t initial_howto; 58static u_int32_t initial_bootdev; 59static struct bootinfo *initial_bootinfo; 60 61struct arch_switch archsw; /* MI/MD interface boundary */ 62 63static void extract_currdev(void); 64static int isa_inb(int port); 65static void isa_outb(int port, int value); 66 67/* from vers.c */ 68extern char bootprog_name[], bootprog_rev[], bootprog_date[], bootprog_maker[]; 69 70/* XXX debugging */ 71extern char end[]; 72 73void 74main(void) 75{ 76 int i; 77 78 /* Pick up arguments */ 79 kargs = (void *)__args; 80 initial_howto = kargs->howto; 81 initial_bootdev = kargs->bootdev; 82 initial_bootinfo = kargs->bootinfo ? (struct bootinfo *)PTOV(kargs->bootinfo) : NULL; 83 84 /* 85 * Initialise the heap as early as possible. Once this is done, malloc() is usable. 86 */ 87 bios_getmem(); 88 89 setheap((void *)end, (void *)bios_basemem); 90 91 /* 92 * XXX Chicken-and-egg problem; we want to have console output early, but some 93 * console attributes may depend on reading from eg. the boot device, which we 94 * can't do yet. 95 * 96 * We can use printf() etc. once this is done. 97 * If the previous boot stage has requested a serial console, prefer that. 98 */ 99 if (initial_howto & RB_SERIAL) 100 setenv("console", "comconsole", 1); 101 if (initial_howto & RB_MUTE) 102 setenv("console", "nullconsole", 1); 103 cons_probe(); 104 105 /* 106 * Initialise the block cache 107 */ 108 bcache_init(32, 512); /* 16k cache XXX tune this */ 109 110 /* 111 * We only want the PXE disk to try to init itself in the below walk through 112 * devsw if we actually booted off of PXE. 113 */ 114 if((kargs->bootinfo == NULL) && 115 ((kargs->bootflags & KARGS_FLAGS_PXE) != 0)) { 116 pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL); 117 } 118 119 /* 120 * March through the device switch probing for things. 121 */ 122 for (i = 0; devsw[i] != NULL; i++) 123 if (devsw[i]->dv_init != NULL) 124 (devsw[i]->dv_init)(); 125 printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024); 126 127 printf("\n"); 128 printf("%s, Revision %s\n", bootprog_name, bootprog_rev); 129 printf("(%s, %s)\n", bootprog_maker, bootprog_date); 130 131 extract_currdev(); /* set $currdev and $loaddev */ 132 setenv("LINES", "24", 1); /* optional */ 133 134 archsw.arch_autoload = i386_autoload; 135 archsw.arch_getdev = i386_getdev; 136 archsw.arch_copyin = i386_copyin; 137 archsw.arch_copyout = i386_copyout; 138 archsw.arch_readin = i386_readin; 139 archsw.arch_isainb = isa_inb; 140 archsw.arch_isaoutb = isa_outb; 141 142 interact(); /* doesn't return */ 143} 144 145/* 146 * Set the 'current device' by (if possible) recovering the boot device as 147 * supplied by the initial bootstrap. 148 * 149 * XXX should be extended for netbooting. 150 */ 151static void 152extract_currdev(void) 153{ 154 struct i386_devdesc currdev; 155 int major, biosdev; 156 157 /* Assume we are booting from a BIOS disk by default */ 158 currdev.d_dev = &biosdisk; 159 currdev.d_type = currdev.d_dev->dv_type; 160 161 /* new-style boot loaders such as pxeldr and cdldr */ 162 if (kargs->bootinfo == NULL) { 163 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) { 164 /* we are booting from a CD with cdldr */ 165 currdev.d_kind.biosdisk.slice = -1; 166 currdev.d_kind.biosdisk.partition = 0; 167 biosdev = initial_bootdev; 168 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) { 169 /* we are booting from pxeldr */ 170 currdev.d_dev = &pxedisk; 171 currdev.d_type = currdev.d_dev->dv_type; 172 currdev.d_kind.netif.unit = 0; 173 } else { 174 /* we don't know what our boot device is */ 175 currdev.d_kind.biosdisk.slice = -1; 176 currdev.d_kind.biosdisk.partition = 0; 177 biosdev = -1; 178 } 179 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) { 180 /* The passed-in boot device is bad */ 181 currdev.d_kind.biosdisk.slice = -1; 182 currdev.d_kind.biosdisk.partition = 0; 183 biosdev = -1; 184 } else { 185 currdev.d_kind.biosdisk.slice = (B_ADAPTOR(initial_bootdev) << 4) + 186 B_CONTROLLER(initial_bootdev) - 1; 187 currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev); 188 biosdev = initial_bootinfo->bi_bios_dev; 189 major = B_TYPE(initial_bootdev); 190 191 /* 192 * If we are booted by an old bootstrap, we have to guess at the BIOS 193 * unit number. We will loose if there is more than one disk type 194 * and we are not booting from the lowest-numbered disk type 195 * (ie. SCSI when IDE also exists). 196 */ 197#ifdef PC98 198 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) { /* biosdev doesn't match major */ 199 if (B_TYPE(initial_bootdev) == 6) 200 biosdev = 0x30 + B_UNIT(initial_bootdev); 201 else 202 biosdev = (major << 3) + 0x80 + B_UNIT(initial_bootdev); 203 } 204#else 205 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) /* biosdev doesn't match major */ 206 biosdev = 0x80 + B_UNIT(initial_bootdev); /* assume harddisk */ 207#endif 208 } 209 210 /* 211 * If we are booting off of a BIOS disk and we didn't succeed in determining 212 * which one we booted off of, just use disk0: as a reasonable default. 213 */ 214 if ((currdev.d_type == devsw[0]->dv_type) && 215 ((currdev.d_kind.biosdisk.unit = bd_bios2unit(biosdev)) == -1)) { 216 printf("Can't work out which disk we are booting from.\n" 217 "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev); 218 currdev.d_kind.biosdisk.unit = 0; 219 } 220 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&currdev), i386_setcurrdev, env_nounset); 221 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&currdev), env_noset, env_nounset); 222} 223 224COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot); 225 226static int 227command_reboot(int argc, char *argv[]) 228{ 229 int i; 230 231 for (i = 0; devsw[i] != NULL; ++i) 232 if (devsw[i]->dv_cleanup != NULL) 233 (devsw[i]->dv_cleanup)(); 234 235 printf("Rebooting...\n"); 236 delay(1000000); 237 __exit(0); 238} 239 240/* provide this for panic, as it's not in the startup code */ 241void 242exit(int code) 243{ 244 __exit(code); 245} 246 247COMMAND_SET(heap, "heap", "show heap usage", command_heap); 248 249static int 250command_heap(int argc, char *argv[]) 251{ 252 mallocstats(); 253 printf("heap base at %p, top at %p\n", end, sbrk(0)); 254 return(CMD_OK); 255} 256 257/* ISA bus access functions for PnP, derived from <machine/cpufunc.h> */ 258static int 259isa_inb(int port) 260{ 261 u_char data; 262 263 if (__builtin_constant_p(port) && 264 (((port) & 0xffff) < 0x100) && 265 ((port) < 0x10000)) { 266 __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port))); 267 } else { 268 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 269 } 270 return(data); 271} 272 273static void 274isa_outb(int port, int value) 275{ 276 u_char al = value; 277 278 if (__builtin_constant_p(port) && 279 (((port) & 0xffff) < 0x100) && 280 ((port) < 0x10000)) { 281 __asm __volatile("outb %0,%1" : : "a" (al), "id" ((u_short)(port))); 282 } else { 283 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 284 } 285} 286 287