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("$FreeBSD$"); 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/disk.h> 42 #include <sys/reboot.h> 43 #include <common/drv.h> 44 45 #include "bootstrap.h" 46 #include "common/bootargs.h" 47 #include "libi386/libi386.h" 48 #include <smbios.h> 49 #include "btxv86.h" 50 51 #ifdef LOADER_ZFS_SUPPORT 52 #include <sys/zfs_bootenv.h> 53 #include "libzfs.h" 54 #endif 55 56 CTASSERT(sizeof(struct bootargs) == BOOTARGS_SIZE); 57 CTASSERT(offsetof(struct bootargs, bootinfo) == BA_BOOTINFO); 58 CTASSERT(offsetof(struct bootargs, bootflags) == BA_BOOTFLAGS); 59 CTASSERT(offsetof(struct bootinfo, bi_size) == BI_SIZE); 60 61 /* Arguments passed in from the boot1/boot2 loader */ 62 static struct bootargs *kargs; 63 64 static uint32_t initial_howto; 65 static uint32_t initial_bootdev; 66 static struct bootinfo *initial_bootinfo; 67 68 struct arch_switch archsw; /* MI/MD interface boundary */ 69 70 static void extract_currdev(void); 71 static int isa_inb(int port); 72 static void isa_outb(int port, int value); 73 void exit(int code); 74 #ifdef LOADER_GELI_SUPPORT 75 #include "geliboot.h" 76 struct geli_boot_args *gargs; 77 struct geli_boot_data *gbdata; 78 #endif 79 #ifdef LOADER_ZFS_SUPPORT 80 struct zfs_boot_args *zargs; 81 static void i386_zfs_probe(void); 82 #endif 83 84 /* XXX debugging */ 85 extern char end[]; 86 87 static void *heap_top; 88 static void *heap_bottom; 89 90 caddr_t 91 ptov(uintptr_t x) 92 { 93 return (PTOV(x)); 94 } 95 96 int 97 main(void) 98 { 99 int i; 100 101 /* Pick up arguments */ 102 kargs = (void *)__args; 103 initial_howto = kargs->howto; 104 initial_bootdev = kargs->bootdev; 105 initial_bootinfo = kargs->bootinfo ? 106 (struct bootinfo *)PTOV(kargs->bootinfo) : NULL; 107 108 /* Initialize the v86 register set to a known-good state. */ 109 bzero(&v86, sizeof(v86)); 110 v86.efl = PSL_RESERVED_DEFAULT | PSL_I; 111 112 /* 113 * Initialise the heap as early as possible. 114 * Once this is done, malloc() is usable. 115 */ 116 bios_getmem(); 117 118 #if defined(LOADER_BZIP2_SUPPORT) || defined(LOADER_FIREWIRE_SUPPORT) || \ 119 defined(LOADER_GPT_SUPPORT) || defined(LOADER_ZFS_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; 125 } else 126 #endif 127 { 128 heap_top = (void *)PTOV(bios_basemem); 129 heap_bottom = (void *)end; 130 } 131 setheap(heap_bottom, heap_top); 132 133 /* 134 * detect ACPI for future reference. This may set console to comconsole 135 * if we do have ACPI SPCR table. 136 */ 137 biosacpi_detect(); 138 139 /* 140 * XXX Chicken-and-egg problem; we want to have console output early, 141 * but some console attributes may depend on reading from eg. the boot 142 * device, which we can't do yet. 143 * 144 * We can use printf() etc. once this is done. 145 * If the previous boot stage has requested a serial console, 146 * prefer that. 147 */ 148 bi_setboothowto(initial_howto); 149 if (initial_howto & RB_MULTIPLE) { 150 if (initial_howto & RB_SERIAL) 151 setenv("console", "comconsole vidconsole", 1); 152 else 153 setenv("console", "vidconsole comconsole", 1); 154 } else if (initial_howto & RB_SERIAL) { 155 setenv("console", "comconsole", 1); 156 } else if (initial_howto & RB_MUTE) { 157 setenv("console", "nullconsole", 1); 158 } 159 cons_probe(); 160 161 /* 162 * Initialise the block cache. Set the upper limit. 163 */ 164 bcache_init(32768, 512); 165 166 /* 167 * Special handling for PXE and CD booting. 168 */ 169 if (kargs->bootinfo == 0) { 170 /* 171 * We only want the PXE disk to try to init itself in the below 172 * walk through devsw if we actually booted off of PXE. 173 */ 174 if (kargs->bootflags & KARGS_FLAGS_PXE) 175 pxe_enable(kargs->pxeinfo ? 176 PTOV(kargs->pxeinfo) : NULL); 177 else if (kargs->bootflags & KARGS_FLAGS_CD) 178 bc_add(initial_bootdev); 179 } 180 181 archsw.arch_autoload = i386_autoload; 182 archsw.arch_getdev = i386_getdev; 183 archsw.arch_copyin = i386_copyin; 184 archsw.arch_copyout = i386_copyout; 185 archsw.arch_readin = i386_readin; 186 archsw.arch_isainb = isa_inb; 187 archsw.arch_isaoutb = isa_outb; 188 archsw.arch_hypervisor = x86_hypervisor; 189 #ifdef LOADER_ZFS_SUPPORT 190 archsw.arch_zfs_probe = i386_zfs_probe; 191 192 /* 193 * zfsboot and gptzfsboot have always passed KARGS_FLAGS_ZFS, 194 * so if that is set along with KARGS_FLAGS_EXTARG we know we 195 * can interpret the extarg data as a struct zfs_boot_args. 196 */ 197 #define KARGS_EXTARGS_ZFS (KARGS_FLAGS_EXTARG | KARGS_FLAGS_ZFS) 198 199 if ((kargs->bootflags & KARGS_EXTARGS_ZFS) == KARGS_EXTARGS_ZFS) { 200 zargs = (struct zfs_boot_args *)(kargs + 1); 201 } 202 #endif /* LOADER_ZFS_SUPPORT */ 203 204 #ifdef LOADER_GELI_SUPPORT 205 /* 206 * If we decided earlier that we have zfs_boot_args extarg data, 207 * and it is big enough to contain the embedded geli data 208 * (the early zfs_boot_args structs weren't), then init the gbdata 209 * pointer accordingly. If there is extarg data which isn't 210 * zfs_boot_args data, determine whether it is geli_boot_args data. 211 * Recent versions of gptboot set KARGS_FLAGS_GELI to indicate that. 212 * Earlier versions didn't, but we presume that's what we 213 * have if the extarg size exactly matches the size of the 214 * geli_boot_args struct during that pre-flag era. 215 */ 216 #define LEGACY_GELI_ARGS_SIZE 260 /* This can never change */ 217 218 #ifdef LOADER_ZFS_SUPPORT 219 if (zargs != NULL) { 220 if (zargs->size > offsetof(struct zfs_boot_args, gelidata)) { 221 gbdata = &zargs->gelidata; 222 } 223 } else 224 #endif /* LOADER_ZFS_SUPPORT */ 225 if ((kargs->bootflags & KARGS_FLAGS_EXTARG) != 0) { 226 gargs = (struct geli_boot_args *)(kargs + 1); 227 if ((kargs->bootflags & KARGS_FLAGS_GELI) || 228 gargs->size == LEGACY_GELI_ARGS_SIZE) { 229 gbdata = &gargs->gelidata; 230 } 231 } 232 233 if (gbdata != NULL) 234 import_geli_boot_data(gbdata); 235 #endif /* LOADER_GELI_SUPPORT */ 236 237 /* 238 * March through the device switch probing for things. 239 */ 240 for (i = 0; devsw[i] != NULL; i++) 241 if (devsw[i]->dv_init != NULL) 242 (devsw[i]->dv_init)(); 243 244 printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, 245 bios_extmem / 1024); 246 if (initial_bootinfo != NULL) { 247 initial_bootinfo->bi_basemem = bios_basemem / 1024; 248 initial_bootinfo->bi_extmem = bios_extmem / 1024; 249 } 250 251 /* detect SMBIOS for future reference */ 252 smbios_detect(NULL); 253 254 /* detect PCI BIOS for future reference */ 255 biospci_detect(); 256 257 printf("\n%s", bootprog_info); 258 259 extract_currdev(); /* set $currdev and $loaddev */ 260 autoload_font(true); 261 262 bios_getsmap(); 263 264 interact(); 265 266 /* if we ever get here, it is an error */ 267 return (1); 268 } 269 270 /* 271 * Set the 'current device' by (if possible) recovering the boot device as 272 * supplied by the initial bootstrap. 273 * 274 * XXX should be extended for netbooting. 275 */ 276 static void 277 extract_currdev(void) 278 { 279 struct i386_devdesc new_currdev; 280 #ifdef LOADER_ZFS_SUPPORT 281 char buf[20]; 282 char *bootonce; 283 #endif 284 int biosdev = -1; 285 286 /* Assume we are booting from a BIOS disk by default */ 287 new_currdev.dd.d_dev = &bioshd; 288 289 /* new-style boot loaders such as pxeldr and cdldr */ 290 if (kargs->bootinfo == 0) { 291 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) { 292 /* we are booting from a CD with cdboot */ 293 new_currdev.dd.d_dev = &bioscd; 294 new_currdev.dd.d_unit = bd_bios2unit(initial_bootdev); 295 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) { 296 /* we are booting from pxeldr */ 297 new_currdev.dd.d_dev = &pxedisk; 298 new_currdev.dd.d_unit = 0; 299 } else { 300 /* we don't know what our boot device is */ 301 new_currdev.d_kind.biosdisk.slice = -1; 302 new_currdev.d_kind.biosdisk.partition = 0; 303 biosdev = -1; 304 } 305 #ifdef LOADER_ZFS_SUPPORT 306 } else if ((kargs->bootflags & KARGS_FLAGS_ZFS) != 0) { 307 /* 308 * zargs was set in main() if we have new style extended 309 * argument 310 */ 311 if (zargs != NULL && 312 zargs->size >= 313 offsetof(struct zfs_boot_args, primary_pool)) { 314 /* sufficient data is provided */ 315 new_currdev.d_kind.zfs.pool_guid = zargs->pool; 316 new_currdev.d_kind.zfs.root_guid = zargs->root; 317 if (zargs->size >= sizeof(*zargs) && 318 zargs->primary_vdev != 0) { 319 sprintf(buf, "%llu", zargs->primary_pool); 320 setenv("vfs.zfs.boot.primary_pool", buf, 1); 321 sprintf(buf, "%llu", zargs->primary_vdev); 322 setenv("vfs.zfs.boot.primary_vdev", buf, 1); 323 } 324 } else { 325 /* old style zfsboot block */ 326 new_currdev.d_kind.zfs.pool_guid = kargs->zfspool; 327 new_currdev.d_kind.zfs.root_guid = 0; 328 } 329 new_currdev.dd.d_dev = &zfs_dev; 330 331 if ((bootonce = malloc(VDEV_PAD_SIZE)) != NULL) { 332 if (zfs_get_bootonce(&new_currdev, OS_BOOTONCE_USED, 333 bootonce, VDEV_PAD_SIZE) == 0) { 334 setenv("zfs-bootonce", bootonce, 1); 335 } 336 free(bootonce); 337 (void) zfs_attach_nvstore(&new_currdev); 338 } 339 340 #endif 341 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) { 342 /* The passed-in boot device is bad */ 343 new_currdev.d_kind.biosdisk.slice = -1; 344 new_currdev.d_kind.biosdisk.partition = 0; 345 biosdev = -1; 346 } else { 347 new_currdev.d_kind.biosdisk.slice = 348 B_SLICE(initial_bootdev) - 1; 349 new_currdev.d_kind.biosdisk.partition = 350 B_PARTITION(initial_bootdev); 351 biosdev = initial_bootinfo->bi_bios_dev; 352 353 /* 354 * If we are booted by an old bootstrap, we have to guess at 355 * the BIOS unit number. We will lose if there is more than 356 * one disk type and we are not booting from the 357 * lowest-numbered disk type (ie. SCSI when IDE also exists). 358 */ 359 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) { 360 /* 361 * biosdev doesn't match major, assume harddisk 362 */ 363 biosdev = 0x80 + B_UNIT(initial_bootdev); 364 } 365 } 366 367 /* 368 * If we are booting off of a BIOS disk and we didn't succeed 369 * in determining which one we booted off of, just use disk0: 370 * as a reasonable default. 371 */ 372 if ((new_currdev.dd.d_dev->dv_type == bioshd.dv_type) && 373 ((new_currdev.dd.d_unit = bd_bios2unit(biosdev)) == -1)) { 374 printf("Can't work out which disk we are booting " 375 "from.\nGuessed BIOS device 0x%x not found by " 376 "probes, defaulting to disk0:\n", biosdev); 377 new_currdev.dd.d_unit = 0; 378 } 379 380 #ifdef LOADER_ZFS_SUPPORT 381 if (new_currdev.dd.d_dev->dv_type == DEVT_ZFS) 382 init_zfs_boot_options(zfs_fmtdev(&new_currdev)); 383 #endif 384 385 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev), 386 i386_setcurrdev, env_nounset); 387 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), 388 env_noset, env_nounset); 389 } 390 391 COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot); 392 393 static int 394 command_reboot(int argc, char *argv[]) 395 { 396 int i; 397 398 for (i = 0; devsw[i] != NULL; ++i) 399 if (devsw[i]->dv_cleanup != NULL) 400 (devsw[i]->dv_cleanup)(); 401 402 printf("Rebooting...\n"); 403 delay(1000000); 404 __exit(0); 405 } 406 407 /* provide this for panic, as it's not in the startup code */ 408 void 409 exit(int code) 410 { 411 __exit(code); 412 } 413 414 COMMAND_SET(heap, "heap", "show heap usage", command_heap); 415 416 static int 417 command_heap(int argc, char *argv[]) 418 { 419 mallocstats(); 420 printf("heap base at %p, top at %p, upper limit at %p\n", heap_bottom, 421 sbrk(0), heap_top); 422 return (CMD_OK); 423 } 424 425 /* ISA bus access functions for PnP. */ 426 static int 427 isa_inb(int port) 428 { 429 430 return (inb(port)); 431 } 432 433 static void 434 isa_outb(int port, int value) 435 { 436 437 outb(port, value); 438 } 439 440 #ifdef LOADER_ZFS_SUPPORT 441 static void 442 i386_zfs_probe(void) 443 { 444 char devname[32]; 445 struct i386_devdesc dev; 446 447 /* 448 * Open all the disks we can find and see if we can reconstruct 449 * ZFS pools from them. 450 */ 451 dev.dd.d_dev = &bioshd; 452 for (dev.dd.d_unit = 0; bd_unit2bios(&dev) >= 0; dev.dd.d_unit++) { 453 snprintf(devname, sizeof(devname), "%s%d:", bioshd.dv_name, 454 dev.dd.d_unit); 455 zfs_probe_dev(devname, NULL); 456 } 457 } 458 #endif 459