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 "libi386/smbios.h" 49 #include "btxv86.h" 50 51 #ifdef LOADER_ZFS_SUPPORT 52 #include "libzfs.h" 53 #endif 54 55 CTASSERT(sizeof(struct bootargs) == BOOTARGS_SIZE); 56 CTASSERT(offsetof(struct bootargs, bootinfo) == BA_BOOTINFO); 57 CTASSERT(offsetof(struct bootargs, bootflags) == BA_BOOTFLAGS); 58 CTASSERT(offsetof(struct bootinfo, bi_size) == BI_SIZE); 59 60 /* Arguments passed in from the boot1/boot2 loader */ 61 static struct bootargs *kargs; 62 63 static uint32_t initial_howto; 64 static uint32_t initial_bootdev; 65 static struct bootinfo *initial_bootinfo; 66 67 struct arch_switch archsw; /* MI/MD interface boundary */ 68 69 static void extract_currdev(void); 70 static int isa_inb(int port); 71 static void isa_outb(int port, int value); 72 void exit(int code); 73 #ifdef LOADER_GELI_SUPPORT 74 #include "geliboot.h" 75 struct geli_boot_args *gargs; 76 struct geli_boot_data *gbdata; 77 #endif 78 #ifdef LOADER_ZFS_SUPPORT 79 struct zfs_boot_args *zargs; 80 static void i386_zfs_probe(void); 81 #endif 82 83 /* XXX debugging */ 84 extern char end[]; 85 86 static void *heap_top; 87 static void *heap_bottom; 88 89 int 90 main(void) 91 { 92 int i; 93 94 /* Pick up arguments */ 95 kargs = (void *)__args; 96 initial_howto = kargs->howto; 97 initial_bootdev = kargs->bootdev; 98 initial_bootinfo = kargs->bootinfo ? (struct bootinfo *)PTOV(kargs->bootinfo) : NULL; 99 100 /* Initialize the v86 register set to a known-good state. */ 101 bzero(&v86, sizeof(v86)); 102 v86.efl = PSL_RESERVED_DEFAULT | PSL_I; 103 104 /* 105 * Initialise the heap as early as possible. Once this is done, malloc() is usable. 106 */ 107 bios_getmem(); 108 109 #if defined(LOADER_BZIP2_SUPPORT) || defined(LOADER_FIREWIRE_SUPPORT) || \ 110 defined(LOADER_GPT_SUPPORT) || defined(LOADER_ZFS_SUPPORT) 111 if (high_heap_size > 0) { 112 heap_top = PTOV(high_heap_base + high_heap_size); 113 heap_bottom = PTOV(high_heap_base); 114 if (high_heap_base < memtop_copyin) 115 memtop_copyin = high_heap_base; 116 } else 117 #endif 118 { 119 heap_top = (void *)PTOV(bios_basemem); 120 heap_bottom = (void *)end; 121 } 122 setheap(heap_bottom, heap_top); 123 124 /* 125 * XXX Chicken-and-egg problem; we want to have console output early, but some 126 * console attributes may depend on reading from eg. the boot device, which we 127 * can't do yet. 128 * 129 * We can use printf() etc. once this is done. 130 * If the previous boot stage has requested a serial console, prefer that. 131 */ 132 bi_setboothowto(initial_howto); 133 if (initial_howto & RB_MULTIPLE) { 134 if (initial_howto & RB_SERIAL) 135 setenv("console", "comconsole vidconsole", 1); 136 else 137 setenv("console", "vidconsole comconsole", 1); 138 } else if (initial_howto & RB_SERIAL) 139 setenv("console", "comconsole", 1); 140 else if (initial_howto & RB_MUTE) 141 setenv("console", "nullconsole", 1); 142 cons_probe(); 143 144 /* 145 * Initialise the block cache. Set the upper limit. 146 */ 147 bcache_init(32768, 512); 148 149 /* 150 * Special handling for PXE and CD booting. 151 */ 152 if (kargs->bootinfo == 0) { 153 /* 154 * We only want the PXE disk to try to init itself in the below 155 * walk through devsw if we actually booted off of PXE. 156 */ 157 if (kargs->bootflags & KARGS_FLAGS_PXE) 158 pxe_enable(kargs->pxeinfo ? PTOV(kargs->pxeinfo) : NULL); 159 else if (kargs->bootflags & KARGS_FLAGS_CD) 160 bc_add(initial_bootdev); 161 } 162 163 archsw.arch_autoload = i386_autoload; 164 archsw.arch_getdev = i386_getdev; 165 archsw.arch_copyin = i386_copyin; 166 archsw.arch_copyout = i386_copyout; 167 archsw.arch_readin = i386_readin; 168 archsw.arch_isainb = isa_inb; 169 archsw.arch_isaoutb = isa_outb; 170 #ifdef LOADER_ZFS_SUPPORT 171 archsw.arch_zfs_probe = i386_zfs_probe; 172 173 /* 174 * zfsboot and gptzfsboot have always passed KARGS_FLAGS_ZFS, so if that is 175 * set along with KARGS_FLAGS_EXTARG we know we can interpret the extarg 176 * data as a struct zfs_boot_args. 177 */ 178 #define KARGS_EXTARGS_ZFS (KARGS_FLAGS_EXTARG | KARGS_FLAGS_ZFS) 179 180 if ((kargs->bootflags & KARGS_EXTARGS_ZFS) == KARGS_EXTARGS_ZFS) { 181 zargs = (struct zfs_boot_args *)(kargs + 1); 182 } 183 #endif /* LOADER_ZFS_SUPPORT */ 184 185 #ifdef LOADER_GELI_SUPPORT 186 /* 187 * If we decided earlier that we have zfs_boot_args extarg data, and it is 188 * big enough to contain the embedded geli data (the early zfs_boot_args 189 * structs weren't), then init the gbdata pointer accordingly. If there is 190 * extarg data which isn't zfs_boot_args data, determine whether it is 191 * geli_boot_args data. Recent versions of gptboot set KARGS_FLAGS_GELI to 192 * indicate that. Earlier versions didn't, but we presume that's what we 193 * have if the extarg size exactly matches the size of the geli_boot_args 194 * struct during that pre-flag era. 195 */ 196 #define LEGACY_GELI_ARGS_SIZE 260 /* This can never change */ 197 198 #ifdef LOADER_ZFS_SUPPORT 199 if (zargs != NULL) { 200 if (zargs->size > offsetof(struct zfs_boot_args, gelidata)) { 201 gbdata = &zargs->gelidata; 202 } 203 } else 204 #endif /* LOADER_ZFS_SUPPORT */ 205 if ((kargs->bootflags & KARGS_FLAGS_EXTARG) != 0) { 206 gargs = (struct geli_boot_args *)(kargs + 1); 207 if ((kargs->bootflags & KARGS_FLAGS_GELI) || 208 gargs->size == LEGACY_GELI_ARGS_SIZE) { 209 gbdata = &gargs->gelidata; 210 } 211 } 212 213 if (gbdata != NULL) 214 import_geli_boot_data(gbdata); 215 #endif /* LOADER_GELI_SUPPORT */ 216 217 /* 218 * March through the device switch probing for things. 219 */ 220 for (i = 0; devsw[i] != NULL; i++) 221 if (devsw[i]->dv_init != NULL) 222 (devsw[i]->dv_init)(); 223 printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, bios_extmem / 1024); 224 if (initial_bootinfo != NULL) { 225 initial_bootinfo->bi_basemem = bios_basemem / 1024; 226 initial_bootinfo->bi_extmem = bios_extmem / 1024; 227 } 228 229 /* detect ACPI for future reference */ 230 biosacpi_detect(); 231 232 /* detect SMBIOS for future reference */ 233 smbios_detect(NULL); 234 235 /* detect PCI BIOS for future reference */ 236 biospci_detect(); 237 238 printf("\n%s", bootprog_info); 239 240 extract_currdev(); /* set $currdev and $loaddev */ 241 setenv("LINES", "24", 1); /* optional */ 242 243 bios_getsmap(); 244 245 interact(); 246 247 /* if we ever get here, it is an error */ 248 return (1); 249 } 250 251 /* 252 * Set the 'current device' by (if possible) recovering the boot device as 253 * supplied by the initial bootstrap. 254 * 255 * XXX should be extended for netbooting. 256 */ 257 static void 258 extract_currdev(void) 259 { 260 struct i386_devdesc new_currdev; 261 #ifdef LOADER_ZFS_SUPPORT 262 char buf[20]; 263 #endif 264 int biosdev = -1; 265 266 /* Assume we are booting from a BIOS disk by default */ 267 new_currdev.dd.d_dev = &bioshd; 268 269 /* new-style boot loaders such as pxeldr and cdldr */ 270 if (kargs->bootinfo == 0) { 271 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) { 272 /* we are booting from a CD with cdboot */ 273 new_currdev.dd.d_dev = &bioscd; 274 new_currdev.dd.d_unit = bd_bios2unit(initial_bootdev); 275 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) { 276 /* we are booting from pxeldr */ 277 new_currdev.dd.d_dev = &pxedisk; 278 new_currdev.dd.d_unit = 0; 279 } else { 280 /* we don't know what our boot device is */ 281 new_currdev.d_kind.biosdisk.slice = -1; 282 new_currdev.d_kind.biosdisk.partition = 0; 283 biosdev = -1; 284 } 285 #ifdef LOADER_ZFS_SUPPORT 286 } else if ((kargs->bootflags & KARGS_FLAGS_ZFS) != 0) { 287 /* zargs was set in main() if we have new style extended argument */ 288 if (zargs != NULL && 289 zargs->size >= offsetof(struct zfs_boot_args, primary_pool)) { 290 /* sufficient data is provided */ 291 new_currdev.d_kind.zfs.pool_guid = zargs->pool; 292 new_currdev.d_kind.zfs.root_guid = zargs->root; 293 if (zargs->size >= sizeof(*zargs) && zargs->primary_vdev != 0) { 294 sprintf(buf, "%llu", zargs->primary_pool); 295 setenv("vfs.zfs.boot.primary_pool", buf, 1); 296 sprintf(buf, "%llu", zargs->primary_vdev); 297 setenv("vfs.zfs.boot.primary_vdev", buf, 1); 298 } 299 } else { 300 /* old style zfsboot block */ 301 new_currdev.d_kind.zfs.pool_guid = kargs->zfspool; 302 new_currdev.d_kind.zfs.root_guid = 0; 303 } 304 new_currdev.dd.d_dev = &zfs_dev; 305 #endif 306 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) { 307 /* The passed-in boot device is bad */ 308 new_currdev.d_kind.biosdisk.slice = -1; 309 new_currdev.d_kind.biosdisk.partition = 0; 310 biosdev = -1; 311 } else { 312 new_currdev.d_kind.biosdisk.slice = B_SLICE(initial_bootdev) - 1; 313 new_currdev.d_kind.biosdisk.partition = B_PARTITION(initial_bootdev); 314 biosdev = initial_bootinfo->bi_bios_dev; 315 316 /* 317 * If we are booted by an old bootstrap, we have to guess at the BIOS 318 * unit number. We will lose if there is more than one disk type 319 * and we are not booting from the lowest-numbered disk type 320 * (ie. SCSI when IDE also exists). 321 */ 322 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) /* biosdev doesn't match major */ 323 biosdev = 0x80 + B_UNIT(initial_bootdev); /* assume harddisk */ 324 } 325 326 /* 327 * If we are booting off of a BIOS disk and we didn't succeed in determining 328 * which one we booted off of, just use disk0: as a reasonable default. 329 */ 330 if ((new_currdev.dd.d_dev->dv_type == bioshd.dv_type) && 331 ((new_currdev.dd.d_unit = bd_bios2unit(biosdev)) == -1)) { 332 printf("Can't work out which disk we are booting from.\n" 333 "Guessed BIOS device 0x%x not found by probes, defaulting to disk0:\n", biosdev); 334 new_currdev.dd.d_unit = 0; 335 } 336 337 #ifdef LOADER_ZFS_SUPPORT 338 if (new_currdev.dd.d_dev->dv_type == DEVT_ZFS) 339 init_zfs_bootenv(zfs_fmtdev(&new_currdev)); 340 #endif 341 342 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev), 343 i386_setcurrdev, env_nounset); 344 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), env_noset, 345 env_nounset); 346 } 347 348 COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot); 349 350 static int 351 command_reboot(int argc, char *argv[]) 352 { 353 int i; 354 355 for (i = 0; devsw[i] != NULL; ++i) 356 if (devsw[i]->dv_cleanup != NULL) 357 (devsw[i]->dv_cleanup)(); 358 359 printf("Rebooting...\n"); 360 delay(1000000); 361 __exit(0); 362 } 363 364 /* provide this for panic, as it's not in the startup code */ 365 void 366 exit(int code) 367 { 368 __exit(code); 369 } 370 371 COMMAND_SET(heap, "heap", "show heap usage", command_heap); 372 373 static int 374 command_heap(int argc, char *argv[]) 375 { 376 mallocstats(); 377 printf("heap base at %p, top at %p, upper limit at %p\n", heap_bottom, 378 sbrk(0), heap_top); 379 return(CMD_OK); 380 } 381 382 /* ISA bus access functions for PnP. */ 383 static int 384 isa_inb(int port) 385 { 386 387 return (inb(port)); 388 } 389 390 static void 391 isa_outb(int port, int value) 392 { 393 394 outb(port, value); 395 } 396 397 #ifdef LOADER_ZFS_SUPPORT 398 static void 399 i386_zfs_probe(void) 400 { 401 char devname[32]; 402 struct i386_devdesc dev; 403 404 /* 405 * Open all the disks we can find and see if we can reconstruct 406 * ZFS pools from them. 407 */ 408 dev.dd.d_dev = &bioshd; 409 for (dev.dd.d_unit = 0; bd_unit2bios(&dev) >= 0; dev.dd.d_unit++) { 410 snprintf(devname, sizeof(devname), "%s%d:", bioshd.dv_name, 411 dev.dd.d_unit); 412 zfs_probe_dev(devname, NULL); 413 } 414 } 415 #endif 416