1 /* 2 * Load and boot NetBSD kernel on Human68k 3 * 4 * written by Yasha (ITOH Yasufumi) 5 * public domain 6 * 7 * loadbsd [-hvV] [-abDs] [-r root_device] netbsd 8 * 9 * loadbsd options: 10 * -h help 11 * -V print version and exit 12 * 13 * kernel options: 14 * -a auto boot, opposite of -s 15 * -s single user boot (default) 16 * -D enter kernel debugger 17 * -b ask root device 18 * -r specify root device 19 * -q quiet boot 20 * -v verbose boot (also turn on verbosity of loadbsd) 21 * 22 * $NetBSD: loadbsd.c,v 1.11 2009/03/14 15:36:15 dsl Exp $ 23 */ 24 25 #include <sys/cdefs.h> 26 27 __RCSID("$NetBSD: loadbsd.c,v 1.11 2009/03/14 15:36:15 dsl Exp $"); 28 #define VERSION "$Revision: 1.11 $ $Date: 2009/03/14 15:36:15 $" 29 30 #include <sys/types.h> /* ntohl */ 31 #include <sys/reboot.h> 32 #include <sys/param.h> /* ALIGN, ALIGNBYTES */ 33 #include <a.out.h> 34 #include <sys/exec_elf.h> 35 #include <string.h> 36 #include <machine/bootinfo.h> 37 38 #include <dos.h> 39 #include <iocs.h> 40 #include "../common/xprintf.h" 41 #include "trampoline.h" 42 43 #define DEFAULT_ROOTDEVNAME "sd@0,0:a" 44 45 #define ISDIGIT(c) ((c) >= '0' && (c) <= '9') 46 47 #define GETDECIMAL(var, str) \ 48 do { var *= 10; var += *str++ - '0'; } while (ISDIGIT(*str)) 49 50 static const char *lookupif(const char *name, 51 unsigned *pif, unsigned *punit); 52 static void get_current_scsi_interface(unsigned *pif, unsigned *punit); 53 static int bootdev(const char *devstr); 54 static struct tramparg *read_kernel(const char *fn); 55 static int chkmpu(void); 56 static __dead void usage(int status, const char *msg) 57 __attribute__((noreturn)); 58 59 int main(int argc, char *argv[]); 60 61 int opt_v; 62 int opt_N; 63 const char *kernel_fn; 64 65 const struct hatbl { 66 char name[4]; 67 unsigned short id; 68 } hatable[] = { 69 X68K_BOOT_SCSIIF_LIST 70 }; 71 72 /* 73 * parse interface name 74 * return the next position 75 */ 76 static const char * 77 lookupif(name, pif, punit) 78 const char *name; 79 unsigned *pif, *punit; 80 { 81 unsigned u, unit; 82 const char *p; 83 84 for (u = 0; u < sizeof hatable / sizeof hatable[0]; u++) { 85 const char *n; 86 87 for (n = hatable[u].name, p = name; *n && *n == *p; n++, p++) 88 ; 89 if (!*n) 90 goto found; 91 } 92 /* not found */ 93 return (char *) 0; 94 95 found: 96 if (*p == '@') 97 p++; 98 99 /* get unit # */ 100 if (!ISDIGIT(*p)) 101 return (char *) 0; 102 103 unit = 0; 104 GETDECIMAL(unit, p); 105 106 *pif = hatable[u].id; 107 *punit = unit; 108 109 return p; 110 } 111 112 /* 113 * if the SCSI interface is not specified, use the current one 114 */ 115 static void 116 get_current_scsi_interface(pif, punit) 117 unsigned *pif, *punit; 118 { 119 unsigned binf; 120 char *bootrom; 121 int bus_err_buf; 122 123 binf = (unsigned) IOCS_BOOTINF(); 124 if (binf < 0x00fc0000) 125 return; /* not booted from SCSI */ 126 127 bootrom = (char *) (binf & 0x00ffffe0); 128 if (IOCS_B_LPEEK(bootrom + 0x24) == 0x53435349 && /* 'SCSI' */ 129 IOCS_B_WPEEK(bootrom + 0x28) == 0x494E) { /* 'IN' */ 130 /* spc0 */ 131 *pif = X68K_BOOT_SCSIIF_SPC; 132 *punit = 0; 133 } else if (DOS_BUS_ERR(&bus_err_buf, (void *)EXSPC_BDID, 1)) { 134 /* mha0 */ 135 *pif = X68K_BOOT_SCSIIF_MHA; 136 *punit = 0; 137 } else { 138 /* spc1 */ 139 *pif = X68K_BOOT_SCSIIF_SPC; 140 *punit = 1; 141 } 142 } 143 144 /* 145 * parse device name 146 * 147 * [/<controller>@<unit>/]<device>@<unit>[,<lun>][:<partition>] 148 * 149 * <unit> must be target SCSI ID if <device> is a SCSI device 150 * 151 * full form: 152 * /spc@0/sd@1,2:e 153 * 154 * partial form: 155 * /mha@0/sd@1 = /mha@0/sd@1,0:a 156 * sd@1:e = /current_device/sd@1,0e 157 * sd@1,2:e = /current_device/sd@1,2:e 158 */ 159 160 const struct devtbl { 161 char name[3]; 162 u_char major; 163 } devtable[] = { 164 X68K_BOOT_DEV_LIST, 165 X68K_BOOT_NETIF_LIST 166 }; 167 168 static int 169 bootdev(const char *devstr) 170 { 171 unsigned u; 172 unsigned major, unit, lun, partition; 173 int dev; 174 const char *s = devstr; 175 unsigned interface = 0, unit_if = 0; 176 177 if (*s == '/') { 178 /* 179 * /<interface>/<device>" 180 * "/spc@1/sd@2,3:e" 181 */ 182 while (*++s == '/') /* skip slashes */ 183 ; 184 if (!strchr(s, '/')) 185 xerrx(1, "%s: bad format", devstr); 186 187 if (!(s = lookupif(s, &interface, &unit_if))) 188 xerrx(1, "%s: unknown interface", devstr); 189 190 while (*s == '/') /* skip slashes */ 191 s++; 192 } else { 193 /* make lint happy */ 194 interface = 0; 195 unit_if = 0; 196 } 197 198 /* allow r at the top */ 199 if (*s == 'r') 200 s++; 201 202 for (u = 0; u < sizeof devtable / sizeof devtable[0]; u++) 203 if (s[0] == devtable[u].name[0] && s[1] == devtable[u].name[1]) 204 goto found; 205 206 /* not found */ 207 xerrx(1, "%s: unknown device", devstr); 208 209 found: major = devtable[u].major; 210 211 /* 212 * <type>@unit[,lun][:part] 213 * "sd@1,3:a" 214 */ 215 216 /* get device unit # */ 217 s += 2; 218 if (*s == '@') 219 s++; 220 if (!*s) 221 xerrx(1, "%s: missing unit number", devstr); 222 if (!ISDIGIT(*s)) 223 xerrx(1, "%s: wrong device", devstr); 224 225 unit = 0; 226 GETDECIMAL(unit, s); 227 228 lun = 0; 229 if (*s == ',') { 230 s++; 231 if (!ISDIGIT(*s)) 232 xerrx(1, "%s: wrong device", devstr); 233 GETDECIMAL(lun, s); 234 } 235 236 /* get device partition */ 237 if (*s == ':') 238 s++; 239 if (!*s) 240 partition = 0; /* no partition letter -- assuming 'a' */ 241 else if (!s[1]) 242 partition = *s - 'a'; 243 else 244 xerrx(1, "%s: wrong partition letter", devstr); 245 246 /* 247 * sanity check 248 */ 249 if (unit_if >= 16) 250 xerrx(1, "%s: interface unit # too large", devstr); 251 if (unit >= 16) 252 xerrx(1, "%s: device unit # too large", devstr); 253 if (lun >= 8) 254 xerrx(1, "%s: SCSI LUN >= 8 is not supported yet", devstr); 255 if (partition >= 16) 256 xerrx(1, "%s: unsupported partition", devstr); 257 258 /* 259 * encode device to be passed to kernel 260 */ 261 if (X68K_BOOT_DEV_IS_SCSI(major)) { 262 /* 263 * encode SCSI device 264 */ 265 if (interface == 0) 266 get_current_scsi_interface(&interface, &unit_if); 267 268 dev = X68K_MAKESCSIBOOTDEV(major, interface, unit_if, 269 unit, lun, partition); 270 } else { 271 /* encode non-SCSI device */ 272 dev = X68K_MAKEBOOTDEV(major, unit, partition); 273 } 274 275 if (opt_v) 276 xwarnx("%s: major %u, if %u, un_if %u, unit %u, lun %u, partition %u; bootdev 0x%x", 277 devstr, major, interface, unit_if, unit, lun, partition, dev); 278 279 return dev; 280 } 281 282 #define LOADBSD 283 #include "../common/exec_sub.c" 284 285 /* 286 * read kernel and create trampoline 287 * 288 * |----------------------| <- allocated buf addr 289 * | kernel image | 290 * ~ (exec file contents) ~ 291 * | | 292 * |----------------------| <- return value (entry addr of trampoline) 293 * | struct tramparg | 294 * | (trampoline args) | 295 * |----------------------| 296 * | trampoline code | 297 * | (in assembly) | 298 * |----------------------| 299 */ 300 static struct tramparg * 301 read_kernel(const char *fn) 302 { 303 int fd; 304 union dos_fcb *fcb; 305 size_t filesize, nread; 306 void *buf; 307 struct tramparg *arg; 308 size_t size_tramp = end_trampoline - trampoline; 309 310 kernel_fn = fn; 311 312 if ((fd = DOS_OPEN(fn, 0x00)) < 0) /* read only */ 313 xerr(1, "%s: open", fn); 314 315 if ((int)(fcb = DOS_GET_FCB_ADR(fd)) < 0) 316 xerr(1, "%s: get_fcb_adr", fn); 317 318 /* 319 * XXX FCB is in supervisor area 320 */ 321 /*if (fcb->blk.mode != 0)*/ 322 if (IOCS_B_BPEEK((char *)fcb + 1) & 0x80) 323 xerrx(1, "%s: Not a regular file", fn); 324 325 /*filesize = fcb->blk.size;*/ 326 filesize = IOCS_B_LPEEK(&fcb->blk.size); 327 328 if (filesize < sizeof(Elf32_Ehdr)) 329 xerrx(1, "%s: Unknown format", fn); 330 331 /* 332 * read entire file 333 */ 334 if ((int)(buf = DOS_MALLOC(filesize + ALIGNBYTES 335 + sizeof(struct tramparg) 336 + size_tramp + SIZE_TMPSTACK)) < 0) 337 xerr(1, "read_kernel"); 338 339 if ((nread = DOS_READ(fd, buf, filesize)) != filesize) { 340 if ((int)nread < 0) 341 xerr(1, "%s: read", fn); 342 else 343 xerrx(1, "%s: short read", fn); 344 } 345 346 if (DOS_CLOSE(fd) < 0) 347 xerr(1, "%s: close", fn); 348 349 /* 350 * address for argument for trampoline code 351 */ 352 arg = (struct tramparg *) ALIGN((char *) buf + nread); 353 354 if (opt_v) 355 xwarnx("trampoline arg at %p", arg); 356 357 xk_load(&arg->xk, buf, 0 /* XXX load addr should not be fixed */); 358 359 /* 360 * create argument for trampoline code 361 */ 362 arg->bsr_inst = TRAMP_BSR + sizeof(struct tramparg) - 2; 363 arg->tmp_stack = (char *) arg + sizeof(struct tramparg) 364 + size_tramp + SIZE_TMPSTACK; 365 arg->mpu_type = IOCS_MPU_STAT() & 0xff; 366 367 arg->xk.d5 = IOCS_BOOTINF(); /* unused for now */ 368 #if 0 369 /* filled afterwards */ 370 arg->xk.rootdev = 371 arg->xk.boothowto = 372 #endif 373 374 if (opt_v) 375 xwarnx("args: mpu %d, image %p, load 0x%x, entry 0x%x", 376 arg->mpu_type, arg->xk.sec[0].sec_image, 377 arg->xk.load_addr, arg->xk.entry_addr); 378 379 /* 380 * copy trampoline code 381 */ 382 if (opt_v) 383 xwarnx("trampoline code at %p (%u bytes)", 384 (char *) arg + sizeof(struct tramparg), size_tramp); 385 386 memcpy((char *) arg + sizeof(struct tramparg), trampoline, size_tramp); 387 388 return arg; 389 } 390 391 /* 392 * MC68000/010 -> return zero 393 * MC68020 and later -> return nonzero 394 */ 395 static int 396 chkmpu() 397 { 398 register int ret __asm("%d0"); 399 400 __asm("| %0 <- this must be %%d0\n\ 401 moveq #1,%%d0\n\ 402 .long 0x103B02FF | foo: moveb %%pc@((foo+1)-foo-2:B,d0:W:2),%%d0\n\ 403 | ^ ^\n\ 404 | %%d0.b = 0x02 (68000/010)\n\ 405 | = 0xff (68020 and later)\n\ 406 bmis 1f\n\ 407 moveq #0,%%d0 | 68000/010\n\ 408 1:" : "=d" (ret)); 409 410 return ret; 411 } 412 413 static __dead void 414 usage(int status, const char *msg) 415 { 416 extern const char *const __progname; 417 418 if (msg) 419 xwarnx("%s", msg); 420 421 xerrprintf("\ 422 %s [-hvV] [-abDs] [-r root_device] netbsd\n\ 423 \n\ 424 loadbsd options:\n\ 425 \t-h help\n\ 426 \t-v verbose\n\ 427 \t-V print version and exit\n\ 428 \n\ 429 kernel options:\n\ 430 \t-a auto boot, opposite of -s\n\ 431 \t-s single user boot (default)\n\ 432 \t-D enter kernel debugger\n\ 433 \t-b ask root device\n\ 434 \t-r specify root device (default %s)\n\ 435 \t format: [/interface/]device@unit[,lun][:partition]\n\ 436 \t interface: one of spc@0, spc@1, mha@0\n\ 437 \t (current boot interface if omitted)\n\ 438 \t device: one of fd, sd, cd, md, ne\n\ 439 \t unit: device unit number (SCSI ID for SCSI device)\n\ 440 \t lun: SCSI LUN # (0 if omitted)\n\ 441 \t partition: partition letter ('a' if omitted)\n\ 442 ", __progname, DEFAULT_ROOTDEVNAME); 443 444 DOS_EXIT2(status); 445 } 446 447 int 448 main(argc, argv) 449 int argc; 450 char *argv[]; 451 { 452 char *rootdevname = 0; 453 int rootdev; 454 u_long boothowto = RB_SINGLE; 455 const char *kernel; 456 char *p, **flg, **arg; 457 struct tramparg *tramp; 458 struct dos_dregs regs; /* unused... */ 459 int i; 460 461 /* parse options */ 462 for (arg = flg = argv + 1; (p = *flg) && *p == '-'; ) { 463 int c; 464 465 while ((c = *++p)) 466 switch (c) { 467 case 'h': 468 usage(0, (char *) 0); 469 /* NOTREACHED */ 470 break; 471 case 'N': /* don't actually execute kernel */ 472 opt_N = 1; 473 break; 474 case 'v': 475 opt_v = 1; 476 boothowto |= AB_VERBOSE; /* XXX */ 477 break; 478 case 'V': 479 xprintf("loadbsd %s\n", VERSION); 480 return 0; 481 482 /* 483 * kernel boot flags 484 */ 485 case 'r': 486 if (rootdevname) 487 usage(1, "multiple -r flags"); 488 else if (!*++arg) 489 usage(1, "-r requires device name"); 490 else 491 rootdevname = *arg; 492 break; 493 case 'b': 494 boothowto |= RB_ASKNAME; 495 break; 496 case 'a': 497 boothowto &= ~RB_SINGLE; 498 break; 499 case 's': 500 boothowto |= RB_SINGLE; 501 break; 502 case 'D': 503 boothowto |= RB_KDB; 504 break; 505 case 'q': 506 boothowto |= AB_QUIET; 507 break; 508 509 default: 510 usage(1, (char *) 0); 511 /* NOTREACHED */ 512 break; 513 } 514 flg = ++arg; 515 } 516 517 /* check MPU */ 518 if (chkmpu() == 0) 519 xerrx(1, "Can't boot NetBSD on 68000/010"); 520 521 argc -= arg - argv; 522 argv = arg; 523 524 if (argc != 1) 525 usage(1, (char *) 0); 526 527 kernel = *argv; 528 529 rootdev = bootdev(rootdevname ? rootdevname : DEFAULT_ROOTDEVNAME); 530 531 if (opt_v) 532 xwarnx("boothowto 0x%x", boothowto); 533 534 tramp = read_kernel(kernel); 535 536 tramp->xk.rootdev = rootdev; 537 tramp->xk.boothowto = boothowto; 538 539 /* 540 * we never return, and make sure the disk cache 541 * be flushed (if write-back cache is enabled) 542 */ 543 if (opt_v) 544 xwarnx("flush disk cache..."); 545 546 i = DOS_FFLUSH_SET(1); /* enable fflush */ 547 DOS_FFLUSH(); /* then, issue fflush */ 548 (void) DOS_FFLUSH_SET(i); /* restore old mode just in case */ 549 550 /* 551 * the program assumes the MPU caches off 552 */ 553 if (opt_v) 554 xwarnx("flush and disable MPU caches..."); 555 556 IOCS_CACHE_MD(-1); /* flush */ 557 if (!opt_N) 558 IOCS_CACHE_MD(0); /* disable both caches */ 559 560 if (opt_v) 561 xwarnx("Jumping to the kernel. Good Luck!"); 562 563 if (opt_N) 564 xerrx(0, "But don't actually do it."); 565 566 DOS_SUPER_JSR((void (*)(void)) tramp, ®s, ®s); 567 568 /* NOTREACHED */ 569 570 xwarnx("??? return from kernel"); 571 572 return 1; 573 } 574