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 /* 28 * MD bootstrap main() and assorted miscellaneous 29 * commands. 30 */ 31 32 #include <stand.h> 33 #include <stddef.h> 34 #include <string.h> 35 #include <machine/bootinfo.h> 36 #include <machine/cpufunc.h> 37 #include <machine/psl.h> 38 #include <sys/disk.h> 39 #include <sys/reboot.h> 40 #include <common/drv.h> 41 42 #include "bootstrap.h" 43 #include "common/bootargs.h" 44 #include "libi386/libi386.h" 45 #include <smbios.h> 46 #include "btxv86.h" 47 48 #ifdef LOADER_ZFS_SUPPORT 49 #include <sys/zfs_bootenv.h> 50 #include "libzfs.h" 51 #endif 52 53 _Static_assert(sizeof(struct bootargs) == BOOTARGS_SIZE, "Bootarg size bad"); 54 _Static_assert(offsetof(struct bootargs, bootinfo) == BA_BOOTINFO, "BA_BOOTINFO"); 55 _Static_assert(offsetof(struct bootargs, bootflags) == BA_BOOTFLAGS, "BA_BOOTFLAGS"); 56 _Static_assert(offsetof(struct bootinfo, bi_size) == BI_SIZE, "BI_SIZE"); 57 58 /* Arguments passed in from the boot1/boot2 loader */ 59 static struct bootargs *kargs; 60 static uint32_t initial_howto; 61 static uint32_t initial_bootdev; 62 static struct bootinfo *initial_bootinfo; 63 64 struct arch_switch archsw; /* MI/MD interface boundary */ 65 66 static void extract_currdev(void); 67 static int isa_inb(int port); 68 static void isa_outb(int port, int value); 69 void exit(int code); 70 #ifdef LOADER_GELI_SUPPORT 71 #include "geliboot.h" 72 struct geli_boot_args *gargs; 73 struct geli_boot_data *gbdata; 74 #endif 75 #ifdef LOADER_ZFS_SUPPORT 76 struct zfs_boot_args *zargs; 77 static void i386_zfs_probe(void); 78 #endif 79 80 /* XXX debugging */ 81 extern char end[]; 82 83 static void *heap_top; 84 static void *heap_bottom; 85 86 caddr_t 87 ptov(uintptr_t x) 88 { 89 return (PTOV(x)); 90 } 91 92 int 93 main(void) 94 { 95 /* Pick up arguments */ 96 kargs = (void *)__args; 97 initial_howto = kargs->howto; 98 initial_bootdev = kargs->bootdev; 99 initial_bootinfo = kargs->bootinfo ? 100 (struct bootinfo *)PTOV(kargs->bootinfo) : NULL; 101 102 /* Initialize the v86 register set to a known-good state. */ 103 bzero(&v86, sizeof(v86)); 104 v86.efl = PSL_RESERVED_DEFAULT | PSL_I; 105 106 /* 107 * Initialise the heap as early as possible. 108 * Once this is done, malloc() is usable. 109 */ 110 bios_getmem(); 111 112 #if defined(LOADER_BZIP2_SUPPORT) || \ 113 defined(LOADER_GPT_SUPPORT) || defined(LOADER_ZFS_SUPPORT) 114 if (high_heap_size > 0) { 115 heap_top = PTOV(high_heap_base + high_heap_size); 116 heap_bottom = PTOV(high_heap_base); 117 if (high_heap_base < memtop_copyin) 118 memtop_copyin = high_heap_base; 119 } else 120 #endif 121 { 122 heap_top = (void *)PTOV(bios_basemem); 123 heap_bottom = (void *)end; 124 } 125 setheap(heap_bottom, heap_top); 126 127 /* 128 * Now that malloc is usable, allocate a buffer for tslog and start 129 * logging timestamps during the boot process. 130 */ 131 tslog_init(); 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 /* Set up currdev variable to have hooks in place. */ 162 env_setenv("currdev", EV_VOLATILE | EV_NOHOOK, "", 163 gen_setcurrdev, env_nounset); 164 165 /* 166 * Initialise the block cache. Set the upper limit. 167 */ 168 bcache_init(32768, 512); 169 170 /* 171 * Special handling for PXE and CD booting. 172 */ 173 if (kargs->bootinfo == 0) { 174 /* 175 * We only want the PXE disk to try to init itself in the below 176 * walk through devsw if we actually booted off of PXE. 177 */ 178 if (kargs->bootflags & KARGS_FLAGS_PXE) 179 pxe_enable(kargs->pxeinfo ? 180 PTOV(kargs->pxeinfo) : NULL); 181 else if (kargs->bootflags & KARGS_FLAGS_CD) 182 bc_add(initial_bootdev); 183 } 184 185 archsw.arch_autoload = i386_autoload; 186 archsw.arch_getdev = i386_getdev; 187 archsw.arch_copyin = i386_copyin; 188 archsw.arch_copyout = i386_copyout; 189 archsw.arch_readin = i386_readin; 190 archsw.arch_isainb = isa_inb; 191 archsw.arch_isaoutb = isa_outb; 192 archsw.arch_hypervisor = x86_hypervisor; 193 #ifdef LOADER_ZFS_SUPPORT 194 archsw.arch_zfs_probe = i386_zfs_probe; 195 196 /* 197 * zfsboot and gptzfsboot have always passed KARGS_FLAGS_ZFS, 198 * so if that is set along with KARGS_FLAGS_EXTARG we know we 199 * can interpret the extarg data as a struct zfs_boot_args. 200 */ 201 #define KARGS_EXTARGS_ZFS (KARGS_FLAGS_EXTARG | KARGS_FLAGS_ZFS) 202 203 if ((kargs->bootflags & KARGS_EXTARGS_ZFS) == KARGS_EXTARGS_ZFS) { 204 zargs = (struct zfs_boot_args *)(kargs + 1); 205 } 206 #endif /* LOADER_ZFS_SUPPORT */ 207 208 #ifdef LOADER_GELI_SUPPORT 209 /* 210 * If we decided earlier that we have zfs_boot_args extarg data, 211 * and it is big enough to contain the embedded geli data 212 * (the early zfs_boot_args structs weren't), then init the gbdata 213 * pointer accordingly. If there is extarg data which isn't 214 * zfs_boot_args data, determine whether it is geli_boot_args data. 215 * Recent versions of gptboot set KARGS_FLAGS_GELI to indicate that. 216 * Earlier versions didn't, but we presume that's what we 217 * have if the extarg size exactly matches the size of the 218 * geli_boot_args struct during that pre-flag era. 219 */ 220 #define LEGACY_GELI_ARGS_SIZE 260 /* This can never change */ 221 222 #ifdef LOADER_ZFS_SUPPORT 223 if (zargs != NULL) { 224 if (zargs->size > offsetof(struct zfs_boot_args, gelidata)) { 225 gbdata = &zargs->gelidata; 226 } 227 } else 228 #endif /* LOADER_ZFS_SUPPORT */ 229 if ((kargs->bootflags & KARGS_FLAGS_EXTARG) != 0) { 230 gargs = (struct geli_boot_args *)(kargs + 1); 231 if ((kargs->bootflags & KARGS_FLAGS_GELI) || 232 gargs->size == LEGACY_GELI_ARGS_SIZE) { 233 gbdata = &gargs->gelidata; 234 } 235 } 236 237 if (gbdata != NULL) 238 import_geli_boot_data(gbdata); 239 #endif /* LOADER_GELI_SUPPORT */ 240 241 devinit(); 242 243 printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, 244 bios_extmem / 1024); 245 if (initial_bootinfo != NULL) { 246 initial_bootinfo->bi_basemem = bios_basemem / 1024; 247 initial_bootinfo->bi_extmem = bios_extmem / 1024; 248 } 249 250 /* detect SMBIOS for future reference */ 251 smbios_detect(NULL); 252 253 /* detect PCI BIOS for future reference */ 254 biospci_detect(); 255 256 printf("\n%s", bootprog_info); 257 258 extract_currdev(); /* set $currdev and $loaddev */ 259 autoload_font(true); 260 261 bios_getsmap(); 262 263 interact(); 264 265 /* if we ever get here, it is an error */ 266 return (1); 267 } 268 269 /* 270 * Set the 'current device' by (if possible) recovering the boot device as 271 * supplied by the initial bootstrap. 272 * 273 * XXX should be extended for netbooting. 274 */ 275 static void 276 extract_currdev(void) 277 { 278 struct i386_devdesc new_currdev; 279 #ifdef LOADER_ZFS_SUPPORT 280 char buf[20]; 281 char *bootonce; 282 #endif 283 int biosdev = -1; 284 285 /* Assume we are booting from a BIOS disk by default */ 286 new_currdev.dd.d_dev = &bioshd; 287 288 /* new-style boot loaders such as pxeldr and cdldr */ 289 if (kargs->bootinfo == 0) { 290 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) { 291 /* we are booting from a CD with cdboot */ 292 new_currdev.dd.d_dev = &bioscd; 293 new_currdev.dd.d_unit = bd_bios2unit(initial_bootdev); 294 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) { 295 /* we are booting from pxeldr */ 296 new_currdev.dd.d_dev = &pxedisk; 297 new_currdev.dd.d_unit = 0; 298 } else { 299 /* we don't know what our boot device is */ 300 new_currdev.disk.d_slice = -1; 301 new_currdev.disk.d_partition = 0; 302 biosdev = -1; 303 } 304 #ifdef LOADER_ZFS_SUPPORT 305 } else if ((kargs->bootflags & KARGS_FLAGS_ZFS) != 0) { 306 /* 307 * zargs was set in main() if we have new style extended 308 * argument 309 */ 310 if (zargs != NULL && 311 zargs->size >= 312 offsetof(struct zfs_boot_args, primary_pool)) { 313 /* sufficient data is provided */ 314 new_currdev.zfs.pool_guid = zargs->pool; 315 new_currdev.zfs.root_guid = zargs->root; 316 if (zargs->size >= sizeof(*zargs) && 317 zargs->primary_vdev != 0) { 318 sprintf(buf, "%llu", zargs->primary_pool); 319 setenv("vfs.zfs.boot.primary_pool", buf, 1); 320 sprintf(buf, "%llu", zargs->primary_vdev); 321 setenv("vfs.zfs.boot.primary_vdev", buf, 1); 322 } 323 } else { 324 /* old style zfsboot block */ 325 new_currdev.zfs.pool_guid = kargs->zfspool; 326 new_currdev.zfs.root_guid = 0; 327 } 328 new_currdev.dd.d_dev = &zfs_dev; 329 330 if ((bootonce = malloc(VDEV_PAD_SIZE)) != NULL) { 331 if (zfs_get_bootonce(&new_currdev, OS_BOOTONCE_USED, 332 bootonce, VDEV_PAD_SIZE) == 0) { 333 setenv("zfs-bootonce", bootonce, 1); 334 } 335 free(bootonce); 336 (void) zfs_attach_nvstore(&new_currdev); 337 } 338 339 #endif 340 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) { 341 /* The passed-in boot device is bad */ 342 new_currdev.disk.d_slice = -1; 343 new_currdev.disk.d_partition = 0; 344 biosdev = -1; 345 } else { 346 new_currdev.disk.d_slice = B_SLICE(initial_bootdev) - 1; 347 new_currdev.disk.d_partition = B_PARTITION(initial_bootdev); 348 biosdev = initial_bootinfo->bi_bios_dev; 349 350 /* 351 * If we are booted by an old bootstrap, we have to guess at 352 * the BIOS unit number. We will lose if there is more than 353 * one disk type and we are not booting from the 354 * lowest-numbered disk type (ie. SCSI when IDE also exists). 355 */ 356 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) { 357 /* 358 * biosdev doesn't match major, assume harddisk 359 */ 360 biosdev = 0x80 + B_UNIT(initial_bootdev); 361 } 362 } 363 364 /* 365 * If we are booting off of a BIOS disk and we didn't succeed 366 * in determining which one we booted off of, just use disk0: 367 * as a reasonable default. 368 */ 369 if ((new_currdev.dd.d_dev->dv_type == bioshd.dv_type) && 370 ((new_currdev.dd.d_unit = bd_bios2unit(biosdev)) == -1)) { 371 printf("Can't work out which disk we are booting " 372 "from.\nGuessed BIOS device 0x%x not found by " 373 "probes, defaulting to disk0:\n", biosdev); 374 new_currdev.dd.d_unit = 0; 375 } 376 377 #ifdef LOADER_ZFS_SUPPORT 378 if (new_currdev.dd.d_dev->dv_type == DEVT_ZFS) 379 init_zfs_boot_options(devformat(&new_currdev.dd)); 380 #endif 381 382 set_currdev(devformat(&new_currdev.dd)); 383 } 384 385 COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot); 386 387 static int 388 command_reboot(int argc, char *argv[]) 389 { 390 int i; 391 392 for (i = 0; devsw[i] != NULL; ++i) 393 if (devsw[i]->dv_cleanup != NULL) 394 (devsw[i]->dv_cleanup)(); 395 396 printf("Rebooting...\n"); 397 delay(1000000); 398 __exit(0); 399 } 400 401 /* provide this for panic, as it's not in the startup code */ 402 void 403 exit(int code) 404 { 405 __exit(code); 406 } 407 408 COMMAND_SET(heap, "heap", "show heap usage", command_heap); 409 410 static int 411 command_heap(int argc, char *argv[]) 412 { 413 mallocstats(); 414 printf("heap base at %p, top at %p, upper limit at %p\n", heap_bottom, 415 sbrk(0), heap_top); 416 return (CMD_OK); 417 } 418 419 /* ISA bus access functions for PnP. */ 420 static int 421 isa_inb(int port) 422 { 423 424 return (inb(port)); 425 } 426 427 static void 428 isa_outb(int port, int value) 429 { 430 431 outb(port, value); 432 } 433 434 #ifdef LOADER_ZFS_SUPPORT 435 static void 436 i386_zfs_probe(void) 437 { 438 char devname[32]; 439 struct i386_devdesc dev; 440 441 /* 442 * Open all the disks we can find and see if we can reconstruct 443 * ZFS pools from them. 444 */ 445 dev.dd.d_dev = &bioshd; 446 for (dev.dd.d_unit = 0; bd_unit2bios(&dev) >= 0; dev.dd.d_unit++) { 447 snprintf(devname, sizeof(devname), "%s%d:", bioshd.dv_name, 448 dev.dd.d_unit); 449 zfs_probe_dev(devname, NULL, true); 450 } 451 } 452 #endif 453