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 /* Pick up arguments */ 100 kargs = (void *)__args; 101 initial_howto = kargs->howto; 102 initial_bootdev = kargs->bootdev; 103 initial_bootinfo = kargs->bootinfo ? 104 (struct bootinfo *)PTOV(kargs->bootinfo) : NULL; 105 106 /* Initialize the v86 register set to a known-good state. */ 107 bzero(&v86, sizeof(v86)); 108 v86.efl = PSL_RESERVED_DEFAULT | PSL_I; 109 110 /* 111 * Initialise the heap as early as possible. 112 * Once this is done, malloc() is usable. 113 */ 114 bios_getmem(); 115 116 #if defined(LOADER_BZIP2_SUPPORT) || \ 117 defined(LOADER_GPT_SUPPORT) || defined(LOADER_ZFS_SUPPORT) 118 if (high_heap_size > 0) { 119 heap_top = PTOV(high_heap_base + high_heap_size); 120 heap_bottom = PTOV(high_heap_base); 121 if (high_heap_base < memtop_copyin) 122 memtop_copyin = high_heap_base; 123 } else 124 #endif 125 { 126 heap_top = (void *)PTOV(bios_basemem); 127 heap_bottom = (void *)end; 128 } 129 setheap(heap_bottom, heap_top); 130 131 /* 132 * Now that malloc is usable, allocate a buffer for tslog and start 133 * logging timestamps during the boot process. 134 */ 135 tslog_init(); 136 137 /* 138 * detect ACPI for future reference. This may set console to comconsole 139 * if we do have ACPI SPCR table. 140 */ 141 biosacpi_detect(); 142 143 /* 144 * XXX Chicken-and-egg problem; we want to have console output early, 145 * but some console attributes may depend on reading from eg. the boot 146 * device, which we can't do yet. 147 * 148 * We can use printf() etc. once this is done. 149 * If the previous boot stage has requested a serial console, 150 * prefer that. 151 */ 152 bi_setboothowto(initial_howto); 153 if (initial_howto & RB_MULTIPLE) { 154 if (initial_howto & RB_SERIAL) 155 setenv("console", "comconsole vidconsole", 1); 156 else 157 setenv("console", "vidconsole comconsole", 1); 158 } else if (initial_howto & RB_SERIAL) { 159 setenv("console", "comconsole", 1); 160 } else if (initial_howto & RB_MUTE) { 161 setenv("console", "nullconsole", 1); 162 } 163 cons_probe(); 164 165 /* Set up currdev variable to have hooks in place. */ 166 env_setenv("currdev", EV_VOLATILE | EV_NOHOOK, "", 167 gen_setcurrdev, env_nounset); 168 169 /* 170 * Initialise the block cache. Set the upper limit. 171 */ 172 bcache_init(32768, 512); 173 174 /* 175 * Special handling for PXE and CD booting. 176 */ 177 if (kargs->bootinfo == 0) { 178 /* 179 * We only want the PXE disk to try to init itself in the below 180 * walk through devsw if we actually booted off of PXE. 181 */ 182 if (kargs->bootflags & KARGS_FLAGS_PXE) 183 pxe_enable(kargs->pxeinfo ? 184 PTOV(kargs->pxeinfo) : NULL); 185 else if (kargs->bootflags & KARGS_FLAGS_CD) 186 bc_add(initial_bootdev); 187 } 188 189 archsw.arch_autoload = i386_autoload; 190 archsw.arch_getdev = i386_getdev; 191 archsw.arch_copyin = i386_copyin; 192 archsw.arch_copyout = i386_copyout; 193 archsw.arch_readin = i386_readin; 194 archsw.arch_isainb = isa_inb; 195 archsw.arch_isaoutb = isa_outb; 196 archsw.arch_hypervisor = x86_hypervisor; 197 #ifdef LOADER_ZFS_SUPPORT 198 archsw.arch_zfs_probe = i386_zfs_probe; 199 200 /* 201 * zfsboot and gptzfsboot have always passed KARGS_FLAGS_ZFS, 202 * so if that is set along with KARGS_FLAGS_EXTARG we know we 203 * can interpret the extarg data as a struct zfs_boot_args. 204 */ 205 #define KARGS_EXTARGS_ZFS (KARGS_FLAGS_EXTARG | KARGS_FLAGS_ZFS) 206 207 if ((kargs->bootflags & KARGS_EXTARGS_ZFS) == KARGS_EXTARGS_ZFS) { 208 zargs = (struct zfs_boot_args *)(kargs + 1); 209 } 210 #endif /* LOADER_ZFS_SUPPORT */ 211 212 #ifdef LOADER_GELI_SUPPORT 213 /* 214 * If we decided earlier that we have zfs_boot_args extarg data, 215 * and it is big enough to contain the embedded geli data 216 * (the early zfs_boot_args structs weren't), then init the gbdata 217 * pointer accordingly. If there is extarg data which isn't 218 * zfs_boot_args data, determine whether it is geli_boot_args data. 219 * Recent versions of gptboot set KARGS_FLAGS_GELI to indicate that. 220 * Earlier versions didn't, but we presume that's what we 221 * have if the extarg size exactly matches the size of the 222 * geli_boot_args struct during that pre-flag era. 223 */ 224 #define LEGACY_GELI_ARGS_SIZE 260 /* This can never change */ 225 226 #ifdef LOADER_ZFS_SUPPORT 227 if (zargs != NULL) { 228 if (zargs->size > offsetof(struct zfs_boot_args, gelidata)) { 229 gbdata = &zargs->gelidata; 230 } 231 } else 232 #endif /* LOADER_ZFS_SUPPORT */ 233 if ((kargs->bootflags & KARGS_FLAGS_EXTARG) != 0) { 234 gargs = (struct geli_boot_args *)(kargs + 1); 235 if ((kargs->bootflags & KARGS_FLAGS_GELI) || 236 gargs->size == LEGACY_GELI_ARGS_SIZE) { 237 gbdata = &gargs->gelidata; 238 } 239 } 240 241 if (gbdata != NULL) 242 import_geli_boot_data(gbdata); 243 #endif /* LOADER_GELI_SUPPORT */ 244 245 devinit(); 246 247 printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, 248 bios_extmem / 1024); 249 if (initial_bootinfo != NULL) { 250 initial_bootinfo->bi_basemem = bios_basemem / 1024; 251 initial_bootinfo->bi_extmem = bios_extmem / 1024; 252 } 253 254 /* detect SMBIOS for future reference */ 255 smbios_detect(NULL); 256 257 /* detect PCI BIOS for future reference */ 258 biospci_detect(); 259 260 printf("\n%s", bootprog_info); 261 262 extract_currdev(); /* set $currdev and $loaddev */ 263 autoload_font(true); 264 265 bios_getsmap(); 266 267 interact(); 268 269 /* if we ever get here, it is an error */ 270 return (1); 271 } 272 273 /* 274 * Set the 'current device' by (if possible) recovering the boot device as 275 * supplied by the initial bootstrap. 276 * 277 * XXX should be extended for netbooting. 278 */ 279 static void 280 extract_currdev(void) 281 { 282 struct i386_devdesc new_currdev; 283 #ifdef LOADER_ZFS_SUPPORT 284 char buf[20]; 285 char *bootonce; 286 #endif 287 int biosdev = -1; 288 289 /* Assume we are booting from a BIOS disk by default */ 290 new_currdev.dd.d_dev = &bioshd; 291 292 /* new-style boot loaders such as pxeldr and cdldr */ 293 if (kargs->bootinfo == 0) { 294 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) { 295 /* we are booting from a CD with cdboot */ 296 new_currdev.dd.d_dev = &bioscd; 297 new_currdev.dd.d_unit = bd_bios2unit(initial_bootdev); 298 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) { 299 /* we are booting from pxeldr */ 300 new_currdev.dd.d_dev = &pxedisk; 301 new_currdev.dd.d_unit = 0; 302 } else { 303 /* we don't know what our boot device is */ 304 new_currdev.disk.d_slice = -1; 305 new_currdev.disk.d_partition = 0; 306 biosdev = -1; 307 } 308 #ifdef LOADER_ZFS_SUPPORT 309 } else if ((kargs->bootflags & KARGS_FLAGS_ZFS) != 0) { 310 /* 311 * zargs was set in main() if we have new style extended 312 * argument 313 */ 314 if (zargs != NULL && 315 zargs->size >= 316 offsetof(struct zfs_boot_args, primary_pool)) { 317 /* sufficient data is provided */ 318 new_currdev.zfs.pool_guid = zargs->pool; 319 new_currdev.zfs.root_guid = zargs->root; 320 if (zargs->size >= sizeof(*zargs) && 321 zargs->primary_vdev != 0) { 322 sprintf(buf, "%llu", zargs->primary_pool); 323 setenv("vfs.zfs.boot.primary_pool", buf, 1); 324 sprintf(buf, "%llu", zargs->primary_vdev); 325 setenv("vfs.zfs.boot.primary_vdev", buf, 1); 326 } 327 } else { 328 /* old style zfsboot block */ 329 new_currdev.zfs.pool_guid = kargs->zfspool; 330 new_currdev.zfs.root_guid = 0; 331 } 332 new_currdev.dd.d_dev = &zfs_dev; 333 334 if ((bootonce = malloc(VDEV_PAD_SIZE)) != NULL) { 335 if (zfs_get_bootonce(&new_currdev, OS_BOOTONCE_USED, 336 bootonce, VDEV_PAD_SIZE) == 0) { 337 setenv("zfs-bootonce", bootonce, 1); 338 } 339 free(bootonce); 340 (void) zfs_attach_nvstore(&new_currdev); 341 } 342 343 #endif 344 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) { 345 /* The passed-in boot device is bad */ 346 new_currdev.disk.d_slice = -1; 347 new_currdev.disk.d_partition = 0; 348 biosdev = -1; 349 } else { 350 new_currdev.disk.d_slice = B_SLICE(initial_bootdev) - 1; 351 new_currdev.disk.d_partition = B_PARTITION(initial_bootdev); 352 biosdev = initial_bootinfo->bi_bios_dev; 353 354 /* 355 * If we are booted by an old bootstrap, we have to guess at 356 * the BIOS unit number. We will lose if there is more than 357 * one disk type and we are not booting from the 358 * lowest-numbered disk type (ie. SCSI when IDE also exists). 359 */ 360 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) { 361 /* 362 * biosdev doesn't match major, assume harddisk 363 */ 364 biosdev = 0x80 + B_UNIT(initial_bootdev); 365 } 366 } 367 368 /* 369 * If we are booting off of a BIOS disk and we didn't succeed 370 * in determining which one we booted off of, just use disk0: 371 * as a reasonable default. 372 */ 373 if ((new_currdev.dd.d_dev->dv_type == bioshd.dv_type) && 374 ((new_currdev.dd.d_unit = bd_bios2unit(biosdev)) == -1)) { 375 printf("Can't work out which disk we are booting " 376 "from.\nGuessed BIOS device 0x%x not found by " 377 "probes, defaulting to disk0:\n", biosdev); 378 new_currdev.dd.d_unit = 0; 379 } 380 381 #ifdef LOADER_ZFS_SUPPORT 382 if (new_currdev.dd.d_dev->dv_type == DEVT_ZFS) 383 init_zfs_boot_options(devformat(&new_currdev.dd)); 384 #endif 385 386 set_currdev(devformat(&new_currdev.dd)); 387 } 388 389 COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot); 390 391 static int 392 command_reboot(int argc, char *argv[]) 393 { 394 int i; 395 396 for (i = 0; devsw[i] != NULL; ++i) 397 if (devsw[i]->dv_cleanup != NULL) 398 (devsw[i]->dv_cleanup)(); 399 400 printf("Rebooting...\n"); 401 delay(1000000); 402 __exit(0); 403 } 404 405 /* provide this for panic, as it's not in the startup code */ 406 void 407 exit(int code) 408 { 409 __exit(code); 410 } 411 412 COMMAND_SET(heap, "heap", "show heap usage", command_heap); 413 414 static int 415 command_heap(int argc, char *argv[]) 416 { 417 mallocstats(); 418 printf("heap base at %p, top at %p, upper limit at %p\n", heap_bottom, 419 sbrk(0), heap_top); 420 return (CMD_OK); 421 } 422 423 /* ISA bus access functions for PnP. */ 424 static int 425 isa_inb(int port) 426 { 427 428 return (inb(port)); 429 } 430 431 static void 432 isa_outb(int port, int value) 433 { 434 435 outb(port, value); 436 } 437 438 #ifdef LOADER_ZFS_SUPPORT 439 static void 440 i386_zfs_probe(void) 441 { 442 char devname[32]; 443 struct i386_devdesc dev; 444 445 /* 446 * Open all the disks we can find and see if we can reconstruct 447 * ZFS pools from them. 448 */ 449 dev.dd.d_dev = &bioshd; 450 for (dev.dd.d_unit = 0; bd_unit2bios(&dev) >= 0; dev.dd.d_unit++) { 451 snprintf(devname, sizeof(devname), "%s%d:", bioshd.dv_name, 452 dev.dd.d_unit); 453 zfs_probe_dev(devname, NULL, true); 454 } 455 } 456 #endif 457