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 29 /* 30 * MD bootstrap main() and assorted miscellaneous 31 * commands. 32 */ 33 34 #include <stand.h> 35 #include <stddef.h> 36 #include <string.h> 37 #include <machine/bootinfo.h> 38 #include <machine/cpufunc.h> 39 #include <machine/psl.h> 40 #include <sys/disk.h> 41 #include <sys/param.h> 42 #include <sys/reboot.h> 43 #include <sys/zfs_bootenv.h> 44 #include <rbx.h> 45 46 #include "bootstrap.h" 47 #include "common/bootargs.h" 48 #include "libi386/libi386.h" 49 #include "smbios.h" 50 #include "btxv86.h" 51 #include "libzfs.h" 52 53 CTASSERT(sizeof (struct bootargs) == BOOTARGS_SIZE); 54 CTASSERT(offsetof(struct bootargs, bootinfo) == BA_BOOTINFO); 55 CTASSERT(offsetof(struct bootargs, bootflags) == BA_BOOTFLAGS); 56 CTASSERT(offsetof(struct bootinfo, bi_size) == BI_SIZE); 57 58 /* Arguments passed in from the boot1/boot2 loader */ 59 struct bootargs *kargs; 60 61 uint32_t opts; 62 static uint32_t initial_bootdev; 63 static struct bootinfo *initial_bootinfo; 64 65 struct arch_switch archsw; /* MI/MD interface boundary */ 66 67 static void extract_currdev(void); 68 static int isa_inb(int port); 69 static void isa_outb(int port, int value); 70 void exit(int code); 71 static void i386_zfs_probe(void); 72 73 /* XXX debugging */ 74 extern char _end[]; 75 76 static void *heap_top; 77 static void *heap_bottom; 78 79 caddr_t 80 ptov(uintptr_t x) 81 { 82 return (PTOV(x)); 83 } 84 85 int 86 main(void) 87 { 88 int i; 89 90 /* Pick up arguments */ 91 kargs = (void *)__args; 92 opts = kargs->howto; 93 initial_bootdev = kargs->bootdev; 94 initial_bootinfo = kargs->bootinfo ? 95 (struct bootinfo *)PTOV(kargs->bootinfo) : NULL; 96 97 /* Initialize the v86 register set to a known-good state. */ 98 bzero(&v86, sizeof (v86)); 99 v86.efl = PSL_RESERVED_DEFAULT | PSL_I; 100 101 /* 102 * Initialise the heap as early as possible. 103 * Once this is done, malloc() is usable. 104 */ 105 bios_getmem(); 106 107 if (high_heap_size > 0) { 108 heap_top = PTOV(high_heap_base + high_heap_size); 109 heap_bottom = PTOV(high_heap_base); 110 if (high_heap_base < memtop_copyin) 111 memtop_copyin = high_heap_base; 112 } else { 113 heap_top = (void *)PTOV(bios_basemem); 114 heap_bottom = (void *)_end; 115 } 116 setheap(heap_bottom, heap_top); 117 118 /* detect ACPI for future reference */ 119 biosacpi_detect(); 120 121 /* 122 * XXX Chicken-and-egg problem; we want to have console output early, 123 * but some console attributes may depend on reading from eg. the boot 124 * device, which we can't do yet. 125 * 126 * We can use printf() etc. once this is done. 127 * If the previous boot stage has requested a serial console, 128 * prefer that. 129 */ 130 bi_setboothowto(opts); 131 if (OPT_CHECK(RBX_DUAL)) { 132 if (OPT_CHECK(RBX_SERIAL)) 133 setenv("console", "ttya text", 1); 134 else 135 setenv("console", "text ttya", 1); 136 } else if (OPT_CHECK(RBX_SERIAL)) { 137 setenv("console", "ttya", 1); 138 } else if (OPT_CHECK(RBX_MUTE)) { 139 setenv("console", "null", 1); 140 } 141 cons_probe(); 142 143 /* 144 * Initialise the block cache. Set the upper limit. 145 */ 146 bcache_init(32768, 512); 147 148 /* 149 * Special handling for PXE and CD booting. 150 */ 151 if (kargs->bootinfo == 0) { 152 /* 153 * We only want the PXE disk to try to init itself in the below 154 * walk through devsw if we actually booted off of PXE. 155 */ 156 if (kargs->bootflags & KARGS_FLAGS_PXE) 157 pxe_enable(kargs->pxeinfo ? 158 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 archsw.arch_loadaddr = i386_loadaddr; 171 archsw.arch_hypervisor = x86_hypervisor; 172 archsw.arch_zfs_probe = i386_zfs_probe; 173 174 /* 175 * March through the device switch probing for things. 176 */ 177 for (i = 0; devsw[i] != NULL; i++) 178 if (devsw[i]->dv_init != NULL) 179 (devsw[i]->dv_init)(); 180 181 printf("BIOS %dkB/%dkB available memory\n", bios_basemem / 1024, 182 bios_extmem / 1024); 183 if (initial_bootinfo != NULL) { 184 initial_bootinfo->bi_basemem = bios_basemem / 1024; 185 initial_bootinfo->bi_extmem = bios_extmem / 1024; 186 } 187 188 /* detect SMBIOS for future reference */ 189 smbios_detect(NULL); 190 191 /* detect PCI BIOS for future reference */ 192 biospci_detect(); 193 194 printf("\n%s", bootprog_info); 195 196 extract_currdev(); /* set $currdev and $loaddev */ 197 autoload_font(OPT_CHECK(RBX_TEXT_MODE) != 0); 198 199 bi_isadir(); 200 bios_getsmap(); 201 202 interact(NULL); 203 204 /* if we ever get here, it is an error */ 205 return (1); 206 } 207 208 /* 209 * Set the 'current device' by (if possible) recovering the boot device as 210 * supplied by the initial bootstrap. 211 * 212 * XXX should be extended for netbooting. 213 */ 214 static void 215 extract_currdev(void) 216 { 217 struct i386_devdesc new_currdev; 218 struct zfs_boot_args *zargs; 219 char *bootonce; 220 int biosdev = -1; 221 222 /* Assume we are booting from a BIOS disk by default */ 223 new_currdev.dd.d_dev = &bioshd; 224 225 /* new-style boot loaders such as pxeldr and cdldr */ 226 if (kargs->bootinfo == 0) { 227 if ((kargs->bootflags & KARGS_FLAGS_CD) != 0) { 228 /* we are booting from a CD with cdboot */ 229 new_currdev.dd.d_dev = &bioscd; 230 new_currdev.dd.d_unit = bd_bios2unit(initial_bootdev); 231 } else if ((kargs->bootflags & KARGS_FLAGS_PXE) != 0) { 232 /* we are booting from pxeldr */ 233 new_currdev.dd.d_dev = &pxedisk; 234 new_currdev.dd.d_unit = 0; 235 } else { 236 /* we don't know what our boot device is */ 237 new_currdev.d_kind.biosdisk.slice = -1; 238 new_currdev.d_kind.biosdisk.partition = 0; 239 biosdev = -1; 240 } 241 } else if ((kargs->bootflags & KARGS_FLAGS_ZFS) != 0) { 242 zargs = NULL; 243 /* check for new style extended argument */ 244 if ((kargs->bootflags & KARGS_FLAGS_EXTARG) != 0) 245 zargs = (struct zfs_boot_args *)(kargs + 1); 246 247 if (zargs != NULL && 248 zargs->size >= 249 offsetof(struct zfs_boot_args, primary_pool)) { 250 /* sufficient data is provided */ 251 new_currdev.d_kind.zfs.pool_guid = zargs->pool; 252 new_currdev.d_kind.zfs.root_guid = zargs->root; 253 } else { 254 /* old style zfsboot block */ 255 new_currdev.d_kind.zfs.pool_guid = kargs->zfspool; 256 new_currdev.d_kind.zfs.root_guid = 0; 257 } 258 new_currdev.dd.d_dev = &zfs_dev; 259 if ((bootonce = malloc(VDEV_PAD_SIZE)) != NULL) { 260 if (zfs_get_bootonce(&new_currdev, OS_BOOTONCE_USED, 261 bootonce, VDEV_PAD_SIZE) == 0) { 262 setenv("zfs-bootonce", bootonce, 1); 263 } 264 free(bootonce); 265 (void) zfs_attach_nvstore(&new_currdev); 266 } else { 267 printf("Failed to process bootonce data: %s\n", 268 strerror(errno)); 269 } 270 } else if ((initial_bootdev & B_MAGICMASK) != B_DEVMAGIC) { 271 /* The passed-in boot device is bad */ 272 new_currdev.d_kind.biosdisk.slice = -1; 273 new_currdev.d_kind.biosdisk.partition = 0; 274 biosdev = -1; 275 } else { 276 new_currdev.d_kind.biosdisk.slice = 277 B_SLICE(initial_bootdev) - 1; 278 new_currdev.d_kind.biosdisk.partition = 279 B_PARTITION(initial_bootdev); 280 biosdev = initial_bootinfo->bi_bios_dev; 281 282 /* 283 * If we are booted by an old bootstrap, we have to guess at 284 * the BIOS unit number. We will lose if there is more than 285 * one disk type and we are not booting from the 286 * lowest-numbered disk type (ie. SCSI when IDE also exists). 287 */ 288 if ((biosdev == 0) && (B_TYPE(initial_bootdev) != 2)) { 289 /* 290 * biosdev doesn't match major, assume harddisk 291 */ 292 biosdev = 0x80 + B_UNIT(initial_bootdev); 293 } 294 } 295 296 /* 297 * If we are booting off of a BIOS disk and we didn't succeed 298 * in determining which one we booted off of, just use disk0: 299 * as a reasonable default. 300 */ 301 if ((new_currdev.dd.d_dev->dv_type == bioshd.dv_type) && 302 ((new_currdev.dd.d_unit = bd_bios2unit(biosdev)) == -1)) { 303 printf("Can't work out which disk we are booting " 304 "from.\nGuessed BIOS device 0x%x not found by " 305 "probes, defaulting to disk0:\n", biosdev); 306 new_currdev.dd.d_unit = 0; 307 } 308 309 env_setenv("currdev", EV_VOLATILE, i386_fmtdev(&new_currdev), 310 i386_setcurrdev, env_nounset); 311 env_setenv("loaddev", EV_VOLATILE, i386_fmtdev(&new_currdev), 312 env_noset, env_nounset); 313 } 314 315 COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot); 316 317 static int 318 command_reboot(int argc __unused, char *argv[] __unused) 319 { 320 int i; 321 322 for (i = 0; devsw[i] != NULL; ++i) 323 if (devsw[i]->dv_cleanup != NULL) 324 (devsw[i]->dv_cleanup)(); 325 326 printf("Rebooting...\n"); 327 delay(1000000); 328 __exit(0); 329 } 330 331 /* provide this for panic, as it's not in the startup code */ 332 void 333 exit(int code) 334 { 335 __exit(code); 336 } 337 338 COMMAND_SET(heap, "heap", "show heap usage", command_heap); 339 340 static int 341 command_heap(int argc __unused, char *argv[] __unused) 342 { 343 344 mallocstats(); 345 printf("heap base at %p, top at %p, upper limit at %p\n", heap_bottom, 346 sbrk(0), heap_top); 347 return (CMD_OK); 348 } 349 350 /* ISA bus access functions for PnP. */ 351 static int 352 isa_inb(int port) 353 { 354 355 return (inb(port)); 356 } 357 358 static void 359 isa_outb(int port, int value) 360 { 361 362 outb(port, value); 363 } 364 365 static void 366 i386_zfs_probe(void) 367 { 368 char devname[32]; 369 struct i386_devdesc dev; 370 371 /* 372 * Open all the disks we can find and see if we can reconstruct 373 * ZFS pools from them. 374 */ 375 dev.dd.d_dev = &bioshd; 376 for (dev.dd.d_unit = 0; bd_unit2bios(&dev) >= 0; dev.dd.d_unit++) { 377 snprintf(devname, sizeof (devname), "%s%d:", bioshd.dv_name, 378 dev.dd.d_unit); 379 zfs_probe_dev(devname, NULL); 380 } 381 } 382