main.c revision 295475
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: stable/10/sys/boot/i386/loader/main.c 295475 2016-02-10 17:49:22Z allanjude $"); 29 30/* 31 * MD bootstrap main() and assorted miscellaneous 32 * commands. 33 */ 34 35#include <stand.h> 36#include <stddef.h> 37#include <string.h> 38#include <machine/bootinfo.h> 39#include <machine/cpufunc.h> 40#include <machine/psl.h> 41#include <sys/reboot.h> 42 43#include "bootstrap.h" 44#include "common/bootargs.h" 45#include "libi386/libi386.h" 46#include "libi386/smbios.h" 47#include "btxv86.h" 48 49#ifdef LOADER_ZFS_SUPPORT 50#include "../zfs/libzfs.h" 51#endif 52 53CTASSERT(sizeof(struct bootargs) == BOOTARGS_SIZE); 54CTASSERT(offsetof(struct bootargs, bootinfo) == BA_BOOTINFO); 55CTASSERT(offsetof(struct bootargs, bootflags) == BA_BOOTFLAGS); 56CTASSERT(offsetof(struct bootinfo, bi_size) == BI_SIZE); 57 58/* Arguments passed in from the boot1/boot2 loader */ 59static struct bootargs *kargs; 60 61static u_int32_t initial_howto; 62static u_int32_t initial_bootdev; 63static struct bootinfo *initial_bootinfo; 64 65struct arch_switch archsw; /* MI/MD interface boundary */ 66 67static void extract_currdev(void); 68static int isa_inb(int port); 69static void isa_outb(int port, int value); 70void exit(int code); 71#ifdef LOADER_ZFS_SUPPORT 72static void i386_zfs_probe(void); 73#endif 74 75/* from vers.c */ 76extern char bootprog_name[], bootprog_rev[], bootprog_date[], bootprog_maker[]; 77 78/* XXX debugging */ 79extern char end[]; 80 81static void *heap_top; 82static void *heap_bottom; 83 84int 85main(void) 86{ 87 int i; 88 89 /* Pick up arguments */ 90 kargs = (void *)__args; 91 initial_howto = kargs->howto; 92 initial_bootdev = kargs->bootdev; 93 initial_bootinfo = kargs->bootinfo ? (struct bootinfo *)PTOV(kargs->bootinfo) : NULL; 94 95 /* Initialize the v86 register set to a known-good state. */ 96 bzero(&v86, sizeof(v86)); 97 v86.efl = PSL_RESERVED_DEFAULT | PSL_I; 98 99 /* 100 * Initialise the heap as early as possible. Once this is done, malloc() is usable. 101 */ 102 bios_getmem(); 103 104#if defined(LOADER_BZIP2_SUPPORT) || defined(LOADER_FIREWIRE_SUPPORT) || \ 105 defined(LOADER_GPT_SUPPORT) || defined(LOADER_ZFS_SUPPORT) 106 if (high_heap_size > 0) { 107 heap_top = PTOV(high_heap_base + high_heap_size); 108 heap_bottom = PTOV(high_heap_base); 109 if (high_heap_base < memtop_copyin) 110 memtop_copyin = high_heap_base; 111 } else 112#endif 113 { 114 heap_top = (void *)PTOV(bios_basemem); 115 heap_bottom = (void *)end; 116 } 117 setheap(heap_bottom, heap_top); 118 119 /* 120 * XXX Chicken-and-egg problem; we want to have console output early, but some 121 * console attributes may depend on reading from eg. the boot device, which we 122 * can't do yet. 123 * 124 * We can use printf() etc. once this is done. 125 * If the previous boot stage has requested a serial console, prefer that. 126 */ 127 bi_setboothowto(initial_howto); 128 if (initial_howto & RB_MULTIPLE) { 129 if (initial_howto & RB_SERIAL) 130 setenv("console", "comconsole vidconsole", 1); 131 else 132 setenv("console", "vidconsole comconsole", 1); 133 } else if (initial_howto & RB_SERIAL) 134 setenv("console", "comconsole", 1); 135 else if (initial_howto & RB_MUTE) 136 setenv("console", "nullconsole", 1); 137 cons_probe(); 138 139 /* 140 * Initialise the block cache 141 */ 142 bcache_init(32, 512); /* 16k cache XXX tune this */ 143 144 /* 145 * Special handling for PXE and CD booting. 146 */ 147 if (kargs->bootinfo == 0) { 148 /* 149 * We only want the PXE disk to try to init itself in the below 150 * walk through devsw if we actually booted off of PXE. 151 */ 152 if (kargs->bootflags & KARGS_FLAGS_PXE) 153 pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL); 154 else if (kargs->bootflags & KARGS_FLAGS_CD) 155 bc_add(initial_bootdev); 156 } 157 158 archsw.arch_autoload = i386_autoload; 159 archsw.arch_getdev = i386_getdev; 160 archsw.arch_copyin = i386_copyin; 161 archsw.arch_copyout = i386_copyout; 162 archsw.arch_readin = i386_readin; 163 archsw.arch_isainb = isa_inb; 164 archsw.arch_isaoutb = isa_outb; 165#ifdef LOADER_ZFS_SUPPORT 166 archsw.arch_zfs_probe = i386_zfs_probe; 167#endif 168 169 /* 170 * March through the device switch probing for things. 171 */ 172 for (i = 0; devsw[i] != NULL; i++) 173 if (devsw[i]->dv_init != NULL) 174 (devsw[i]->dv_init)(); 175 printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024); 176 if (initial_bootinfo != NULL) { 177 initial_bootinfo->bi_basemem = bios_basemem / 1024; 178 initial_bootinfo->bi_extmem = bios_extmem / 1024; 179 } 180 181 /* detect ACPI for future reference */ 182 biosacpi_detect(); 183 184 /* detect SMBIOS for future reference */ 185 smbios_detect(NULL); 186 187 printf("\n"); 188 printf("%s, Revision %s\n", bootprog_name, bootprog_rev); 189 printf("(%s, %s)\n", bootprog_maker, bootprog_date); 190 191 extract_currdev(); /* set $currdev and $loaddev */ 192 setenv("LINES", "24", 1); /* optional */ 193 194 bios_getsmap(); 195 196 interact(); /* doesn't return */ 197 198 /* if we ever get here, it is an error */ 199 return (1); 200} 201 202/* 203 * Set the 'current device' by (if possible) recovering the boot device as 204 * supplied by the initial bootstrap. 205 * 206 * XXX should be extended for netbooting. 207 */ 208static void 209extract_currdev(void) 210{ 211 struct i386_devdesc new_currdev; 212#ifdef LOADER_ZFS_SUPPORT 213 char buf[20]; 214 struct zfs_boot_args *zargs; 215#endif 216 int biosdev = -1; 217 218 /* Assume we are booting from a BIOS disk by default */ 219 new_currdev.d_dev = &biosdisk; 220 221 /* new-style boot loaders such as pxeldr and cdldr */ 222 if (kargs->bootinfo == 0) { 223 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) { 224 /* we are booting from a CD with cdboot */ 225 new_currdev.d_dev = &bioscd; 226 new_currdev.d_unit = bc_bios2unit(initial_bootdev); 227 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) { 228 /* we are booting from pxeldr */ 229 new_currdev.d_dev = &pxedisk; 230 new_currdev.d_unit = 0; 231 } else { 232 /* we don't know what our boot device is */ 233 new_currdev.d_kind.biosdisk.slice = -1; 234 new_currdev.d_kind.biosdisk.partition = 0; 235 biosdev = -1; 236 } 237#ifdef LOADER_ZFS_SUPPORT 238 } else if ((kargs->bootflags & KARGS_FLAGS_ZFS) != 0) { 239 zargs = NULL; 240 /* check for new style extended argument */ 241 if ((kargs->bootflags & KARGS_FLAGS_EXTARG) != 0) 242 zargs = (struct zfs_boot_args *)(kargs + 1); 243 244 if (zargs != NULL && 245 zargs->size >= offsetof(struct zfs_boot_args, primary_pool)) { 246 /* sufficient data is provided */ 247 new_currdev.d_kind.zfs.pool_guid = zargs->pool; 248 new_currdev.d_kind.zfs.root_guid = zargs->root; 249 if (zargs->size >= sizeof(*zargs) && zargs->primary_vdev != 0) { 250 sprintf(buf, "%llu", zargs->primary_pool); 251 setenv("vfs.zfs.boot.primary_pool", buf, 1); 252 sprintf(buf, "%llu", zargs->primary_vdev); 253 setenv("vfs.zfs.boot.primary_vdev", buf, 1); 254 } 255 } else { 256 /* old style zfsboot block */ 257 new_currdev.d_kind.zfs.pool_guid = kargs->zfspool; 258 new_currdev.d_kind.zfs.root_guid = 0; 259 } 260 new_currdev.d_dev = &zfs_dev; 261#endif 262 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) { 263 /* The passed-in boot device is bad */ 264 new_currdev.d_kind.biosdisk.slice = -1; 265 new_currdev.d_kind.biosdisk.partition = 0; 266 biosdev = -1; 267 } else { 268 new_currdev.d_kind.biosdisk.slice = B_SLICE(initial_bootdev) - 1; 269 new_currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev); 270 biosdev = initial_bootinfo->bi_bios_dev; 271 272 /* 273 * If we are booted by an old bootstrap, we have to guess at the BIOS 274 * unit number. We will lose if there is more than one disk type 275 * and we are not booting from the lowest-numbered disk type 276 * (ie. SCSI when IDE also exists). 277 */ 278 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) /* biosdev doesn't match major */ 279 biosdev = 0x80 + B_UNIT(initial_bootdev); /* assume harddisk */ 280 } 281 new_currdev.d_type = new_currdev.d_dev->dv_type; 282 283 /* 284 * If we are booting off of a BIOS disk and we didn't succeed in determining 285 * which one we booted off of, just use disk0: as a reasonable default. 286 */ 287 if ((new_currdev.d_type == biosdisk.dv_type) && 288 ((new_currdev.d_unit = bd_bios2unit(biosdev)) == -1)) { 289 printf("Can't work out which disk we are booting from.\n" 290 "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev); 291 new_currdev.d_unit = 0; 292 } 293 294#ifdef LOADER_ZFS_SUPPORT 295 if (new_currdev.d_type == DEVT_ZFS) 296 init_zfs_bootenv(zfs_fmtdev(&new_currdev)); 297#endif 298 299 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev), 300 i386_setcurrdev, env_nounset); 301 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), env_noset, 302 env_nounset); 303} 304 305COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot); 306 307static int 308command_reboot(int argc, char *argv[]) 309{ 310 int i; 311 312 for (i = 0; devsw[i] != NULL; ++i) 313 if (devsw[i]->dv_cleanup != NULL) 314 (devsw[i]->dv_cleanup)(); 315 316 printf("Rebooting...\n"); 317 delay(1000000); 318 __exit(0); 319} 320 321/* provide this for panic, as it's not in the startup code */ 322void 323exit(int code) 324{ 325 __exit(code); 326} 327 328COMMAND_SET(heap, "heap", "show heap usage", command_heap); 329 330static int 331command_heap(int argc, char *argv[]) 332{ 333 mallocstats(); 334 printf("heap base at %p, top at %p, upper limit at %p\n", heap_bottom, 335 sbrk(0), heap_top); 336 return(CMD_OK); 337} 338 339#ifdef LOADER_ZFS_SUPPORT 340COMMAND_SET(lszfs, "lszfs", "list child datasets of a zfs dataset", 341 command_lszfs); 342 343static int 344command_lszfs(int argc, char *argv[]) 345{ 346 int err; 347 348 if (argc != 2) { 349 command_errmsg = "wrong number of arguments"; 350 return (CMD_ERROR); 351 } 352 353 err = zfs_list(argv[1]); 354 if (err != 0) { 355 command_errmsg = strerror(err); 356 return (CMD_ERROR); 357 } 358 359 return (CMD_OK); 360} 361 362COMMAND_SET(reloadbe, "reloadbe", "refresh the list of ZFS Boot Environments", 363 command_reloadbe); 364 365static int 366command_reloadbe(int argc, char *argv[]) 367{ 368 int err; 369 char *root; 370 371 if (argc > 2) { 372 command_errmsg = "wrong number of arguments"; 373 return (CMD_ERROR); 374 } 375 376 if (argc == 2) { 377 err = zfs_bootenv(argv[1]); 378 } else { 379 root = getenv("zfs_be_root"); 380 if (root == NULL) { 381 /* There does not appear to be a ZFS pool here, exit without error */ 382 return (CMD_OK); 383 } 384 err = zfs_bootenv(getenv("zfs_be_root")); 385 } 386 387 if (err != 0) { 388 command_errmsg = strerror(err); 389 return (CMD_ERROR); 390 } 391 392 return (CMD_OK); 393} 394#endif 395 396/* ISA bus access functions for PnP. */ 397static int 398isa_inb(int port) 399{ 400 401 return (inb(port)); 402} 403 404static void 405isa_outb(int port, int value) 406{ 407 408 outb(port, value); 409} 410 411#ifdef LOADER_ZFS_SUPPORT 412static void 413i386_zfs_probe(void) 414{ 415 char devname[32]; 416 int unit; 417 418 /* 419 * Open all the disks we can find and see if we can reconstruct 420 * ZFS pools from them. 421 */ 422 for (unit = 0; unit < MAXBDDEV; unit++) { 423 if (bd_unit2bios(unit) == -1) 424 break; 425 sprintf(devname, "disk%d:", unit); 426 zfs_probe_dev(devname, NULL); 427 } 428} 429#endif 430