boot.c revision 1.8
1 /* $NetBSD: boot.c,v 1.8 2001/01/17 15:37:06 ws Exp $ */ 2 3 /*- 4 * Copyright (c) 1997 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Copyright (C) 1995, 1996 Wolfgang Solfrank. 41 * Copyright (C) 1995, 1996 TooLs GmbH. 42 * All rights reserved. 43 * 44 * ELF support derived from NetBSD/alpha's boot loader, written 45 * by Christopher G. Demetriou. 46 * 47 * Redistribution and use in source and binary forms, with or without 48 * modification, are permitted provided that the following conditions 49 * are met: 50 * 1. Redistributions of source code must retain the above copyright 51 * notice, this list of conditions and the following disclaimer. 52 * 2. Redistributions in binary form must reproduce the above copyright 53 * notice, this list of conditions and the following disclaimer in the 54 * documentation and/or other materials provided with the distribution. 55 * 3. All advertising materials mentioning features or use of this software 56 * must display the following acknowledgement: 57 * This product includes software developed by TooLs GmbH. 58 * 4. The name of TooLs GmbH may not be used to endorse or promote products 59 * derived from this software without specific prior written permission. 60 * 61 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 62 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 63 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 64 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 65 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 66 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 67 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 68 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 69 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 70 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 71 */ 72 73 /* 74 * First try for the boot code 75 * 76 * Input syntax is: 77 * [promdev[{:|,}partition]]/[filename] [flags] 78 */ 79 80 #define ELFSIZE 32 /* We use 32-bit ELF. */ 81 82 #include <sys/param.h> 83 #include <sys/exec.h> 84 #include <sys/exec_elf.h> 85 #include <sys/reboot.h> 86 #include <sys/disklabel.h> 87 #include <sys/boot_flag.h> 88 89 #include <lib/libsa/stand.h> 90 #include <lib/libkern/libkern.h> 91 92 #include <machine/cpu.h> 93 #include <machine/machine_type.h> 94 95 #include "ofdev.h" 96 #include "openfirm.h" 97 98 char bootdev[128]; 99 char bootfile[128]; 100 int boothowto; 101 int debug; 102 103 #ifdef POWERPC_BOOT_ELF 104 int elf_exec __P((int, Elf_Ehdr *, u_int32_t *, void **)); 105 #endif 106 107 #ifdef POWERPC_BOOT_AOUT 108 int aout_exec __P((int, struct exec *, u_int32_t *, void **)); 109 #endif 110 111 static void 112 prom2boot(dev) 113 char *dev; 114 { 115 char *cp; 116 117 for (cp = dev; *cp != '\0'; cp++) 118 if (*cp == ':') { 119 *cp = '\0'; 120 return; 121 } 122 } 123 124 static void 125 parseargs(str, howtop) 126 char *str; 127 int *howtop; 128 { 129 char *cp; 130 131 /* Allow user to drop back to the PROM. */ 132 if (strcmp(str, "exit") == 0) 133 OF_exit(); 134 135 *howtop = 0; 136 for (cp = str; *cp; cp++) 137 if (*cp == ' ' || *cp == '-') 138 break; 139 if (!*cp) 140 return; 141 142 *cp++ = '\0'; 143 while (*cp) 144 BOOT_FLAG(*cp++, *howtop); 145 } 146 147 static void 148 chain(entry, args, esym) 149 void (*entry)(); 150 char *args; 151 void *esym; 152 { 153 extern char end[]; 154 int l, machine_tag; 155 156 freeall(); 157 158 /* 159 * Stash pointer to end of symbol table after the argument 160 * strings. 161 */ 162 l = strlen(args) + 1; 163 bcopy(&esym, args + l, sizeof(esym)); 164 l += sizeof(esym); 165 166 /* 167 * Tell the kernel we're an OpenFirmware system. 168 */ 169 machine_tag = POWERPC_MACHINE_OPENFIRMWARE; 170 bcopy(&machine_tag, args + l, sizeof(machine_tag)); 171 l += sizeof(machine_tag); 172 173 OF_chain((void *)RELOC, end - (char *)RELOC, entry, args, l); 174 panic("chain"); 175 } 176 177 int 178 loadfile(fd, args) 179 int fd; 180 char *args; 181 { 182 union { 183 #ifdef POWERPC_BOOT_AOUT 184 struct exec aout; 185 #endif 186 #ifdef POWERPC_BOOT_ELF 187 Elf_Ehdr elf; 188 #endif 189 } hdr; 190 int rval; 191 u_int32_t entry; 192 void *esym; 193 194 rval = 1; 195 esym = NULL; 196 197 /* Load the header. */ 198 if (read(fd, &hdr, sizeof(hdr)) != sizeof(hdr)) { 199 printf("read header: %s\n", strerror(errno)); 200 goto err; 201 } 202 203 /* Determine file type, load kernel. */ 204 #ifdef POWERPC_BOOT_AOUT 205 if (N_BADMAG(hdr.aout) == 0 && N_GETMID(hdr.aout) == MID_POWERPC) { 206 rval = aout_exec(fd, &hdr.aout, &entry, &esym); 207 } else 208 #endif 209 #ifdef POWERPC_BOOT_ELF 210 if (memcmp(hdr.elf.e_ident, ELFMAG, SELFMAG) == 0 && 211 hdr.elf.e_ident[EI_CLASS] == ELFCLASS) { 212 rval = elf_exec(fd, &hdr.elf, &entry, &esym); 213 } else 214 #endif 215 { 216 printf("unknown executable format\n"); 217 } 218 219 if (rval) 220 goto err; 221 222 printf(" start=0x%x\n", entry); 223 224 close(fd); 225 226 /* XXX this should be replaced w/ a mountroothook. */ 227 if (floppyboot) { 228 printf("Please insert root disk and press ENTER "); 229 getchar(); 230 printf("\n"); 231 } 232 233 chain((void *)entry, args, esym); 234 /* NOTREACHED */ 235 236 err: 237 close(fd); 238 return (rval); 239 } 240 241 __dead void 242 _rtt() 243 { 244 245 OF_exit(); 246 } 247 248 #ifdef POWERPC_BOOT_AOUT 249 int 250 aout_exec(fd, hdr, entryp, esymp) 251 int fd; 252 struct exec *hdr; 253 u_int32_t *entryp; 254 void **esymp; 255 { 256 int n, *addr; 257 258 /* Display the load address (entry point) for a.out. */ 259 printf("Booting %s @ 0x%lx\n", opened_name, hdr->a_entry); 260 addr = (void *)(hdr->a_entry); 261 262 /* 263 * Determine memory needed for kernel and allocate it from 264 * the firmware. 265 */ 266 n = hdr->a_text + hdr->a_data + hdr->a_bss + hdr->a_syms + sizeof(int); 267 268 /* Load text. */ 269 lseek(fd, N_TXTOFF(*hdr), SEEK_SET); 270 printf("%lu", hdr->a_text); 271 if (read(fd, addr, hdr->a_text) != hdr->a_text) { 272 printf("read text: %s\n", strerror(errno)); 273 return (1); 274 } 275 __syncicache((void *)addr, hdr->a_text); 276 277 /* Load data. */ 278 printf("+%lu", hdr->a_data); 279 if (read(fd, (char *)addr + hdr->a_text, hdr->a_data) != hdr->a_data) { 280 printf("read data: %s\n", strerror(errno)); 281 return (1); 282 } 283 284 /* Zero BSS. */ 285 printf("+%lu", hdr->a_bss); 286 bzero((char *)addr + hdr->a_text + hdr->a_data, hdr->a_bss); 287 288 /* Symbols. */ 289 *esymp = addr; 290 addr = (int *)((char *)addr + hdr->a_text + hdr->a_data + hdr->a_bss); 291 *addr++ = hdr->a_syms; 292 if (hdr->a_syms) { 293 printf(" [%lu", hdr->a_syms); 294 if (read(fd, addr, hdr->a_syms) != hdr->a_syms) { 295 printf("read symbols: %s\n", strerror(errno)); 296 return (1); 297 } 298 addr = (int *)((char *)addr + hdr->a_syms); 299 if (read(fd, &n, sizeof(int)) != sizeof(int)) { 300 printf("read symbols: %s\n", strerror(errno)); 301 return (1); 302 } 303 *addr++ = n; 304 if (read(fd, addr, n - sizeof(int)) != n - sizeof(int)) { 305 printf("read symbols: %s\n", strerror(errno)); 306 return (1); 307 } 308 printf("+%d]", n - sizeof(int)); 309 *esymp = addr + (n - sizeof(int)); 310 } 311 312 *entryp = hdr->a_entry; 313 return (0); 314 } 315 #endif /* POWERPC_BOOT_AOUT */ 316 317 #ifdef POWERPC_BOOT_ELF 318 int 319 elf_exec(fd, elf, entryp, esymp) 320 int fd; 321 Elf_Ehdr *elf; 322 u_int32_t *entryp; 323 void **esymp; 324 { 325 Elf32_Shdr *shp; 326 Elf32_Off off; 327 void *addr; 328 size_t size; 329 int i, first = 1; 330 int n; 331 332 /* 333 * Don't display load address for ELF; it's encoded in 334 * each section. 335 */ 336 printf("Booting %s\n", opened_name); 337 338 for (i = 0; i < elf->e_phnum; i++) { 339 Elf_Phdr phdr; 340 (void)lseek(fd, elf->e_phoff + sizeof(phdr) * i, SEEK_SET); 341 if (read(fd, (void *)&phdr, sizeof(phdr)) != sizeof(phdr)) { 342 printf("read phdr: %s\n", strerror(errno)); 343 return (1); 344 } 345 if (phdr.p_type != PT_LOAD || 346 (phdr.p_flags & (PF_W|PF_X)) == 0) 347 continue; 348 349 /* Read in segment. */ 350 printf("%s%lu@0x%lx", first ? "" : "+", phdr.p_filesz, 351 (u_long)phdr.p_vaddr); 352 (void)lseek(fd, phdr.p_offset, SEEK_SET); 353 if (read(fd, (void *)phdr.p_vaddr, phdr.p_filesz) != 354 phdr.p_filesz) { 355 printf("read segment: %s\n", strerror(errno)); 356 return (1); 357 } 358 __syncicache((void *)phdr.p_vaddr, phdr.p_filesz); 359 360 /* Zero BSS. */ 361 if (phdr.p_filesz < phdr.p_memsz) { 362 printf("+%lu@0x%lx", phdr.p_memsz - phdr.p_filesz, 363 (u_long)(phdr.p_vaddr + phdr.p_filesz)); 364 bzero((void *)phdr.p_vaddr + phdr.p_filesz, 365 phdr.p_memsz - phdr.p_filesz); 366 } 367 first = 0; 368 } 369 370 printf(" \n"); 371 372 #if 0 /* I want to rethink this... --thorpej (at) netbsd.org */ 373 /* 374 * Compute the size of the symbol table. 375 */ 376 size = sizeof(Elf_Ehdr) + (elf->e_shnum * sizeof(Elf32_Shdr)); 377 shp = addr = alloc(elf->e_shnum * sizeof(Elf32_Shdr)); 378 (void)lseek(fd, elf->e_shoff, SEEK_SET); 379 if (read(fd, addr, elf->e_shnum * sizeof(Elf32_Shdr)) != 380 elf->e_shnum * sizeof(Elf32_Shdr)) { 381 printf("read section headers: %s\n", strerror(errno)); 382 return (1); 383 } 384 for (i = 0; i < elf->e_shnum; i++, shp++) { 385 if (shp->sh_type == SHT_NULL) 386 continue; 387 if (shp->sh_type != SHT_SYMTAB 388 && shp->sh_type != SHT_STRTAB) { 389 shp->sh_offset = 0; 390 shp->sh_type = SHT_NOBITS; 391 continue; 392 } 393 size += shp->sh_size; 394 } 395 shp = addr; 396 397 panic("no space for symbol table"); 398 399 /* 400 * Copy the headers. 401 */ 402 elf->e_phoff = 0; 403 elf->e_shoff = sizeof(Elf_Ehdr); 404 elf->e_phentsize = 0; 405 elf->e_phnum = 0; 406 bcopy(elf, addr, sizeof(Elf_Ehdr)); 407 bcopy(shp, addr + sizeof(Elf_Ehdr), elf->e_shnum * sizeof(Elf32_Shdr)); 408 free(shp, elf->e_shnum * sizeof(Elf32_Shdr)); 409 *ssymp = addr; 410 411 /* 412 * Now load the symbol sections themselves. 413 */ 414 shp = addr + sizeof(Elf_Ehdr); 415 addr += sizeof(Elf_Ehdr) + (elf->e_shnum * sizeof(Elf32_Shdr)); 416 off = sizeof(Elf_Ehdr) + (elf->e_shnum * sizeof(Elf32_Shdr)); 417 for (first = 1, i = 0; i < elf->e_shnum; i++, shp++) { 418 if (shp->sh_type == SHT_SYMTAB 419 || shp->sh_type == SHT_STRTAB) { 420 if (first) 421 printf("symbols @ 0x%lx ", (u_long)addr); 422 printf("%s%d", first ? "" : "+", shp->sh_size); 423 (void)lseek(fd, shp->sh_offset, SEEK_SET); 424 if (read(fd, addr, shp->sh_size) != shp->sh_size) { 425 printf("read symbols: %s\n", strerror(errno)); 426 return (1); 427 } 428 addr += shp->sh_size; 429 shp->sh_offset = off; 430 off += shp->sh_size; 431 first = 0; 432 } 433 } 434 *esymp = addr; 435 #endif /* 0 */ 436 437 *entryp = elf->e_entry; 438 return (0); 439 } 440 #endif /* POWERPC_BOOT_ELF */ 441 442 void 443 main() 444 { 445 extern char bootprog_name[], bootprog_rev[], 446 bootprog_maker[], bootprog_date[]; 447 int chosen; 448 char bootline[512]; /* Should check size? */ 449 char *cp; 450 int fd; 451 452 printf(">> %s, Revision %s\n", bootprog_name, bootprog_rev); 453 printf(">> (%s, %s)\n", bootprog_maker, bootprog_date); 454 455 /* 456 * Get the boot arguments from Openfirmware 457 */ 458 if ((chosen = OF_finddevice("/chosen")) == -1 || 459 OF_getprop(chosen, "bootpath", bootdev, sizeof bootdev) < 0 || 460 OF_getprop(chosen, "bootargs", bootline, sizeof bootline) < 0) { 461 printf("Invalid Openfirmware environment\n"); 462 OF_exit(); 463 } 464 465 prom2boot(bootdev); 466 parseargs(bootline, &boothowto); 467 468 for (;;) { 469 if (boothowto & RB_ASKNAME) { 470 printf("Boot: "); 471 gets(bootline); 472 parseargs(bootline, &boothowto); 473 } 474 if ((fd = open(bootline, 0)) >= 0) 475 break; 476 if (errno) 477 printf("open %s: %s\n", opened_name, strerror(errno)); 478 boothowto |= RB_ASKNAME; 479 } 480 #ifdef __notyet__ 481 OF_setprop(chosen, "bootpath", opened_name, strlen(opened_name) + 1); 482 cp = bootline; 483 #else 484 strcpy(bootline, opened_name); 485 cp = bootline + strlen(bootline); 486 *cp++ = ' '; 487 #endif 488 *cp = '-'; 489 if (boothowto & RB_ASKNAME) 490 *++cp = 'a'; 491 if (boothowto & RB_SINGLE) 492 *++cp = 's'; 493 if (boothowto & RB_KDB) 494 *++cp = 'd'; 495 if (*cp == '-') 496 #ifdef __notyet__ 497 *cp = 0; 498 #else 499 *--cp = 0; 500 #endif 501 else 502 *++cp = 0; 503 #ifdef __notyet__ 504 OF_setprop(chosen, "bootargs", bootline, strlen(bootline) + 1); 505 #endif 506 /* XXX void, for now */ 507 (void)loadfile(fd, bootline); 508 509 OF_exit(); 510 } 511
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