main.c revision 146011
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 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/boot/pc98/loader/main.c 146011 2005-05-08 14:17:28Z nyan $"); 29 30/* 31 * MD bootstrap main() and assorted miscellaneous 32 * commands. 33 */ 34 35#include <stand.h> 36#include <string.h> 37#include <machine/bootinfo.h> 38#include <sys/reboot.h> 39 40#include "bootstrap.h" 41#include "libi386/libi386.h" 42#include "btxv86.h" 43 44#define KARGS_FLAGS_CD 0x1 45#define KARGS_FLAGS_PXE 0x2 46 47/* Arguments passed in from the boot1/boot2 loader */ 48static struct 49{ 50 u_int32_t howto; 51 u_int32_t bootdev; 52 u_int32_t bootflags; 53 u_int32_t pxeinfo; 54 u_int32_t res2; 55 u_int32_t bootinfo; 56} *kargs; 57 58static u_int32_t initial_howto; 59static u_int32_t initial_bootdev; 60static struct bootinfo *initial_bootinfo; 61 62struct arch_switch archsw; /* MI/MD interface boundary */ 63 64static void extract_currdev(void); 65static int isa_inb(int port); 66static void isa_outb(int port, int value); 67void exit(int code); 68 69/* from vers.c */ 70extern char bootprog_name[], bootprog_rev[], bootprog_date[], bootprog_maker[]; 71 72/* XXX debugging */ 73extern char end[]; 74 75int 76main(void) 77{ 78 int i; 79 80 /* Pick up arguments */ 81 kargs = (void *)__args; 82 initial_howto = kargs->howto; 83 initial_bootdev = kargs->bootdev; 84 initial_bootinfo = kargs->bootinfo ? (struct bootinfo *)PTOV(kargs->bootinfo) : NULL; 85 86 /* 87 * Initialise the heap as early as possible. Once this is done, malloc() is usable. 88 */ 89 bios_getmem(); 90 91 setheap((void *)end, (void *)bios_basemem); 92 93 /* 94 * XXX Chicken-and-egg problem; we want to have console output early, but some 95 * console attributes may depend on reading from eg. the boot device, which we 96 * can't do yet. 97 * 98 * We can use printf() etc. once this is done. 99 * If the previous boot stage has requested a serial console, prefer that. 100 */ 101 if (initial_howto & RB_SERIAL) 102 setenv("console", "comconsole", 1); 103 if (initial_howto & RB_MUTE) 104 setenv("console", "nullconsole", 1); 105 if (initial_howto & RB_MULTIPLE) 106 setenv("boot_multicons", "YES", 1); 107 cons_probe(); 108 109 /* 110 * Initialise the block cache 111 */ 112 bcache_init(32, 512); /* 16k cache XXX tune this */ 113 114 /* 115 * Special handling for PXE and CD booting. 116 */ 117 if (kargs->bootinfo == 0) { 118 /* 119 * We only want the PXE disk to try to init itself in the below 120 * walk through devsw if we actually booted off of PXE. 121 */ 122 if (kargs->bootflags & KARGS_FLAGS_PXE) 123 pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL); 124 else if (kargs->bootflags & KARGS_FLAGS_CD) 125 bc_add(initial_bootdev); 126 } 127 128 /* 129 * March through the device switch probing for things. 130 */ 131 for (i = 0; devsw[i] != NULL; i++) 132 if (devsw[i]->dv_init != NULL) 133 (devsw[i]->dv_init)(); 134 printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024); 135 if (initial_bootinfo != NULL) { 136 initial_bootinfo->bi_basemem = bios_basemem / 1024; 137 initial_bootinfo->bi_extmem = bios_extmem / 1024; 138 } 139 140 printf("\n"); 141 printf("%s, Revision %s\n", bootprog_name, bootprog_rev); 142 printf("(%s, %s)\n", bootprog_maker, bootprog_date); 143 144 extract_currdev(); /* set $currdev and $loaddev */ 145 setenv("LINES", "24", 1); /* optional */ 146 147 archsw.arch_autoload = i386_autoload; 148 archsw.arch_getdev = i386_getdev; 149 archsw.arch_copyin = i386_copyin; 150 archsw.arch_copyout = i386_copyout; 151 archsw.arch_readin = i386_readin; 152 archsw.arch_isainb = isa_inb; 153 archsw.arch_isaoutb = isa_outb; 154 155 interact(); /* doesn't return */ 156 157 /* if we ever get here, it is an error */ 158 return (1); 159} 160 161/* 162 * Set the 'current device' by (if possible) recovering the boot device as 163 * supplied by the initial bootstrap. 164 * 165 * XXX should be extended for netbooting. 166 */ 167static void 168extract_currdev(void) 169{ 170 struct i386_devdesc new_currdev; 171 int major, biosdev = -1; 172 173 /* Assume we are booting from a BIOS disk by default */ 174 new_currdev.d_dev = &biosdisk; 175 176 /* new-style boot loaders such as pxeldr and cdldr */ 177 if (kargs->bootinfo == 0) { 178 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) { 179 /* we are booting from a CD with cdboot */ 180 new_currdev.d_dev = &bioscd; 181 new_currdev.d_kind.bioscd.unit = bc_bios2unit(initial_bootdev); 182 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) { 183 /* we are booting from pxeldr */ 184 new_currdev.d_dev = &pxedisk; 185 new_currdev.d_kind.netif.unit = 0; 186 } else { 187 /* we don't know what our boot device is */ 188 new_currdev.d_kind.biosdisk.slice = -1; 189 new_currdev.d_kind.biosdisk.partition = 0; 190 biosdev = -1; 191 } 192 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) { 193 /* The passed-in boot device is bad */ 194 new_currdev.d_kind.biosdisk.slice = -1; 195 new_currdev.d_kind.biosdisk.partition = 0; 196 biosdev = -1; 197 } else { 198 new_currdev.d_kind.biosdisk.slice = (B_ADAPTOR(initial_bootdev) << 4) + 199 B_CONTROLLER(initial_bootdev) - 1; 200 new_currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev); 201 biosdev = initial_bootinfo->bi_bios_dev; 202 major = B_TYPE(initial_bootdev); 203 204 /* 205 * If we are booted by an old bootstrap, we have to guess at the BIOS 206 * unit number. We will loose if there is more than one disk type 207 * and we are not booting from the lowest-numbered disk type 208 * (ie. SCSI when IDE also exists). 209 */ 210 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) { /* biosdev doesn't match major */ 211 if (B_TYPE(initial_bootdev) == 6) 212 biosdev = 0x30 + B_UNIT(initial_bootdev); 213 else 214 biosdev = (major << 3) + 0x80 + B_UNIT(initial_bootdev); 215 } 216 } 217 new_currdev.d_type = new_currdev.d_dev->dv_type; 218 219 /* 220 * If we are booting off of a BIOS disk and we didn't succeed in determining 221 * which one we booted off of, just use disk0: as a reasonable default. 222 */ 223 if ((new_currdev.d_type == biosdisk.dv_type) && 224 ((new_currdev.d_kind.biosdisk.unit = bd_bios2unit(biosdev)) == -1)) { 225 printf("Can't work out which disk we are booting from.\n" 226 "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev); 227 new_currdev.d_kind.biosdisk.unit = 0; 228 } 229 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev), 230 i386_setcurrdev, env_nounset); 231 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), env_noset, 232 env_nounset); 233} 234 235COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot); 236 237static int 238command_reboot(int argc, char *argv[]) 239{ 240 int i; 241 242 for (i = 0; devsw[i] != NULL; ++i) 243 if (devsw[i]->dv_cleanup != NULL) 244 (devsw[i]->dv_cleanup)(); 245 246 printf("Rebooting...\n"); 247 delay(1000000); 248 __exit(0); 249} 250 251/* provide this for panic, as it's not in the startup code */ 252void 253exit(int code) 254{ 255 __exit(code); 256} 257 258COMMAND_SET(heap, "heap", "show heap usage", command_heap); 259 260static int 261command_heap(int argc, char *argv[]) 262{ 263 mallocstats(); 264 printf("heap base at %p, top at %p\n", end, sbrk(0)); 265 return(CMD_OK); 266} 267 268/* ISA bus access functions for PnP, derived from <machine/cpufunc.h> */ 269static int 270isa_inb(int port) 271{ 272 u_char data; 273 274 if (__builtin_constant_p(port) && 275 (((port) & 0xffff) < 0x100) && 276 ((port) < 0x10000)) { 277 __asm __volatile("inb %1,%0" : "=a" (data) : "id" ((u_short)(port))); 278 } else { 279 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 280 } 281 return(data); 282} 283 284static void 285isa_outb(int port, int value) 286{ 287 u_char al = value; 288 289 if (__builtin_constant_p(port) && 290 (((port) & 0xffff) < 0x100) && 291 ((port) < 0x10000)) { 292 __asm __volatile("outb %0,%1" : : "a" (al), "id" ((u_short)(port))); 293 } else { 294 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 295 } 296} 297 298