1 /* $NetBSD: machdep.c,v 1.70 2009/12/16 23:19:07 matt Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * the Systems Programming Group of the University of Utah Computer 9 * Science Department, The Mach Operating System project at 10 * Carnegie-Mellon University and Ralph Campbell. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)machdep.c 8.3 (Berkeley) 1/12/94 37 */ 38 /* 39 * Copyright (c) 1988 University of Utah. 40 * 41 * This code is derived from software contributed to Berkeley by 42 * the Systems Programming Group of the University of Utah Computer 43 * Science Department, The Mach Operating System project at 44 * Carnegie-Mellon University and Ralph Campbell. 45 * 46 * Redistribution and use in source and binary forms, with or without 47 * modification, are permitted provided that the following conditions 48 * are met: 49 * 1. Redistributions of source code must retain the above copyright 50 * notice, this list of conditions and the following disclaimer. 51 * 2. Redistributions in binary form must reproduce the above copyright 52 * notice, this list of conditions and the following disclaimer in the 53 * documentation and/or other materials provided with the distribution. 54 * 3. All advertising materials mentioning features or use of this software 55 * must display the following acknowledgement: 56 * This product includes software developed by the University of 57 * California, Berkeley and its contributors. 58 * 4. Neither the name of the University nor the names of its contributors 59 * may be used to endorse or promote products derived from this software 60 * without specific prior written permission. 61 * 62 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 63 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 64 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 65 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 66 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 67 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 68 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 69 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 70 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 71 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 72 * SUCH DAMAGE. 73 * 74 * @(#)machdep.c 8.3 (Berkeley) 1/12/94 75 */ 76 77 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 78 79 __KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.70 2009/12/16 23:19:07 matt Exp $"); 80 81 /* from: Utah Hdr: machdep.c 1.63 91/04/24 */ 82 83 #include "opt_ddb.h" 84 #include "opt_kgdb.h" 85 #include "opt_modular.h" 86 87 #include <sys/param.h> 88 #include <sys/systm.h> 89 #include <sys/signalvar.h> 90 #include <sys/kernel.h> 91 #include <sys/proc.h> 92 #include <sys/buf.h> 93 #include <sys/reboot.h> 94 #include <sys/conf.h> 95 #include <sys/file.h> 96 #include <sys/callout.h> 97 #include <sys/malloc.h> 98 #include <sys/mbuf.h> 99 #include <sys/msgbuf.h> 100 #include <sys/ioctl.h> 101 #include <sys/device.h> 102 #include <sys/exec.h> 103 #include <sys/mount.h> 104 #include <sys/syscallargs.h> 105 #include <sys/kcore.h> 106 #include <sys/ksyms.h> 107 108 #include <uvm/uvm_extern.h> 109 110 #include <ufs/mfs/mfs_extern.h> /* mfs_initminiroot() */ 111 112 #include <machine/cpu.h> 113 #include <machine/reg.h> 114 #include <machine/psl.h> 115 #include <machine/pte.h> 116 117 #ifdef DDB 118 #include <machine/db_machdep.h> 119 #include <ddb/db_extern.h> 120 #endif 121 122 #include <machine/intr.h> 123 #include <machine/mainboard.h> 124 #include <machine/sysconf.h> 125 #include <machine/autoconf.h> 126 #include <machine/bootinfo.h> 127 #include <machine/prom.h> 128 #include <dev/clock_subr.h> 129 #include <dev/cons.h> 130 131 #include <sys/boot_flag.h> 132 133 #include "fs_mfs.h" 134 #include "opt_execfmt.h" 135 136 #include "zsc.h" /* XXX */ 137 #include "com.h" /* XXX */ 138 #include "ksyms.h" 139 140 /* Our exported CPU info; we can have only one. */ 141 struct cpu_info cpu_info_store; 142 143 /* maps for VM objects */ 144 145 struct vm_map *mb_map = NULL; 146 struct vm_map *phys_map = NULL; 147 148 int physmem; /* max supported memory, changes to actual */ 149 char *bootinfo = NULL; /* pointer to bootinfo structure */ 150 151 phys_ram_seg_t mem_clusters[VM_PHYSSEG_MAX]; 152 int mem_cluster_cnt; 153 154 void to_monitor(int) __attribute__((__noreturn__)); 155 void prom_halt(int) __attribute__((__noreturn__)); 156 157 #ifdef KGDB 158 void zs_kgdb_init(void); 159 void kgdb_connect(int); 160 #endif 161 162 /* 163 * Local functions. 164 */ 165 int initcpu(void); 166 void configure(void); 167 168 void mach_init(int, char *[], char*[], u_int, char *); 169 int memsize_scan(void *); 170 171 #ifdef DEBUG 172 /* stacktrace code violates prototypes to get callee's registers */ 173 extern void stacktrace(void); /*XXX*/ 174 #endif 175 176 /* 177 * safepri is a safe priority for sleep to set for a spin-wait 178 * during autoconfiguration or after a panic. Used as an argument to splx(). 179 * XXX disables interrupt 5 to disable mips3 on-chip clock, which also 180 * disables mips1 FPU interrupts. 181 */ 182 int safepri = MIPS3_PSL_LOWIPL; /* XXX */ 183 184 /* locore callback-vector setup */ 185 extern void mips_vector_init(void); 186 extern void prom_init(void); 187 extern void pizazz_init(void); 188 189 /* platform-specific initialization vector */ 190 static void unimpl_cons_init(void); 191 static void unimpl_iointr(unsigned, unsigned, unsigned, unsigned); 192 static int unimpl_memsize(void *); 193 static void unimpl_intr_establish(int, int (*)(void *), void *); 194 195 struct platform platform = { 196 .iobus = "iobus not set", 197 .cons_init = unimpl_cons_init, 198 .iointr = unimpl_iointr, 199 .memsize = unimpl_memsize, 200 .intr_establish = unimpl_intr_establish, 201 .clkinit = NULL, 202 }; 203 204 struct consdev *cn_tab = NULL; 205 extern struct consdev consdev_prom; 206 extern struct consdev consdev_zs; 207 208 static void null_cnprobe(struct consdev *); 209 static void prom_cninit(struct consdev *); 210 static int prom_cngetc(dev_t); 211 static void prom_cnputc(dev_t, int); 212 static void null_cnpollc(dev_t, int); 213 214 struct consdev consdev_prom = { 215 null_cnprobe, 216 prom_cninit, 217 prom_cngetc, 218 prom_cnputc, 219 null_cnpollc, 220 }; 221 222 223 /* 224 * Do all the stuff that locore normally does before calling main(). 225 * Process arguments passed to us by the prom monitor. 226 * Return the first page address following the system. 227 */ 228 void 229 mach_init(int argc, char *argv[], char *envp[], u_int bim, char *bip) 230 { 231 u_long first, last; 232 char *kernend; 233 char *cp; 234 int i, howto; 235 extern char edata[], end[]; 236 const char *bi_msg; 237 #if NKSYMS || defined(DDB) || defined(MODULAR) 238 int nsym = 0; 239 char *ssym = 0; 240 char *esym = 0; 241 struct btinfo_symtab *bi_syms; 242 #endif 243 244 245 /* Check for valid bootinfo passed from bootstrap */ 246 if (bim == BOOTINFO_MAGIC) { 247 struct btinfo_magic *bi_magic; 248 249 bootinfo = (char *)BOOTINFO_ADDR; /* XXX */ 250 bi_magic = lookup_bootinfo(BTINFO_MAGIC); 251 if (bi_magic == NULL || bi_magic->magic != BOOTINFO_MAGIC) 252 bi_msg = "invalid bootinfo structure.\n"; 253 else 254 bi_msg = NULL; 255 } else 256 bi_msg = "invalid bootinfo (standalone boot?)\n"; 257 258 /* clear the BSS segment */ 259 kernend = (void *)mips_round_page(end); 260 memset(edata, 0, end - edata); 261 262 #if NKSYMS || defined(DDB) || defined(MODULAR) 263 bi_syms = lookup_bootinfo(BTINFO_SYMTAB); 264 265 /* Load sysmbol table if present */ 266 if (bi_syms != NULL) { 267 nsym = bi_syms->nsym; 268 ssym = (void *)bi_syms->ssym; 269 esym = (void *)bi_syms->esym; 270 kernend = (void *)mips_round_page(esym); 271 } 272 #endif 273 274 prom_init(); 275 consinit(); 276 277 if (bi_msg != NULL) 278 printf(bi_msg); 279 280 /* 281 * Set the VM page size. 282 */ 283 uvm_setpagesize(); 284 285 /* Find out how much memory is available. */ 286 physmem = memsize_scan(kernend); 287 288 /* 289 * Now that we know how much memory we have, initialize the 290 * mem cluster array. 291 */ 292 mem_clusters[0].start = 0; /* XXX is this correct? */ 293 mem_clusters[0].size = ctob(physmem); 294 mem_cluster_cnt = 1; 295 296 /* 297 * Copy exception-dispatch code down to exception vector. 298 * Initialize locore-function vector. 299 * Clear out the I and D caches. 300 */ 301 mips_vector_init(); 302 303 /* Look at argv[0] and compute bootdev */ 304 makebootdev(argv[0]); 305 306 /* 307 * Look at arguments passed to us and compute boothowto. 308 */ 309 boothowto = RB_AUTOBOOT; 310 for (i = 1; i < argc; i++) { 311 for (cp = argv[i]; *cp; cp++) { 312 /* Ignore superfluous '-', if there is one */ 313 if (*cp == '-') 314 continue; 315 316 howto = 0; 317 BOOT_FLAG(*cp, howto); 318 if (! howto) 319 printf("bootflag '%c' not recognised\n", *cp); 320 else 321 boothowto |= howto; 322 } 323 } 324 325 326 #if NKSYMS || defined(DDB) || defined(MODULAR) 327 /* init symbols if present */ 328 if (esym) 329 ksyms_addsyms_elf(esym - ssym, ssym, esym); 330 #endif 331 #ifdef DDB 332 if (boothowto & RB_KDB) 333 Debugger(); 334 #endif 335 #ifdef KGDB 336 zs_kgdb_init(); /* XXX */ 337 if (boothowto & RB_KDB) 338 kgdb_connect(0); 339 #endif 340 341 #ifdef MFS 342 /* 343 * Check to see if a mini-root was loaded into memory. It resides 344 * at the start of the next page just after the end of BSS. 345 */ 346 if (boothowto & RB_MINIROOT) 347 kernend += round_page(mfs_initminiroot(kernend)); 348 #endif 349 350 /* 351 * Load the rest of the available pages into the VM system. 352 */ 353 first = round_page(MIPS_KSEG0_TO_PHYS(kernend)); 354 last = mem_clusters[0].start + mem_clusters[0].size; 355 uvm_page_physload(atop(first), atop(last), atop(first), atop(last), 356 VM_FREELIST_DEFAULT); 357 358 /* 359 * Initialize error message buffer (at end of core). 360 */ 361 mips_init_msgbuf(); 362 363 /* 364 * Initialize the virtual memory system. 365 */ 366 pmap_bootstrap(); 367 368 /* 369 * Allocate uarea page for lwp0 and set it. 370 */ 371 mips_init_lwp0_uarea(); 372 373 /* 374 * Set up interrupt handling and I/O addresses. 375 */ 376 pizazz_init(); 377 } 378 379 380 381 /* 382 * cpu_startup: allocate memory for variable-sized tables, 383 * initialize CPU, and do autoconfiguration. 384 */ 385 void 386 cpu_startup(void) 387 { 388 vaddr_t minaddr, maxaddr; 389 char pbuf[9]; 390 #ifdef DEBUG 391 extern int pmapdebug; 392 int opmapdebug = pmapdebug; 393 394 pmapdebug = 0; 395 #endif 396 397 /* 398 * Good {morning,afternoon,evening,night}. 399 */ 400 printf("%s%s", copyright, version); 401 printf("%s\n", cpu_model); 402 format_bytes(pbuf, sizeof(pbuf), ctob(physmem)); 403 printf("total memory = %s\n", pbuf); 404 405 minaddr = 0; 406 /* 407 * Allocate a submap for physio 408 */ 409 phys_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr, 410 VM_PHYS_SIZE, true, false, NULL); 411 412 /* 413 * No need to allocate an mbuf cluster submap. Mbuf clusters 414 * are allocated via the pool allocator, and we use KSEG to 415 * map those pages. 416 */ 417 418 #ifdef DEBUG 419 pmapdebug = opmapdebug; 420 #endif 421 format_bytes(pbuf, sizeof(pbuf), ptoa(uvmexp.free)); 422 printf("avail memory = %s\n", pbuf); 423 } 424 425 /* 426 * Look up information in bootinfo of boot loader. 427 */ 428 void * 429 lookup_bootinfo(int type) 430 { 431 struct btinfo_common *bt; 432 char *help = bootinfo; 433 434 /* Check for a bootinfo record first. */ 435 if (help == NULL) 436 return (NULL); 437 438 do { 439 bt = (struct btinfo_common *)help; 440 if (bt->type == type) 441 return ((void *)help); 442 help += bt->next; 443 } while (bt->next != 0 && 444 (size_t)help < (size_t)bootinfo + BOOTINFO_SIZE); 445 446 return (NULL); 447 } 448 449 int waittime = -1; 450 451 /* 452 * call PROM to halt or reboot. 453 */ 454 void 455 prom_halt(int howto) 456 { 457 if (howto & RB_HALT) 458 MIPS_PROM(reinit)(); 459 MIPS_PROM(reboot)(); 460 /* NOTREACHED */ 461 } 462 463 void 464 cpu_reboot(volatile int howto, char *bootstr) 465 { 466 /* take a snap shot before clobbering any registers */ 467 if (curlwp) 468 savectx(curpcb); 469 470 #ifdef DEBUG 471 if (panicstr) 472 stacktrace(); 473 #endif 474 475 /* If system is cold, just halt. */ 476 if (cold) { 477 howto |= RB_HALT; 478 goto haltsys; 479 } 480 481 /* If "always halt" was specified as a boot flag, obey. */ 482 if ((boothowto & RB_HALT) != 0) 483 howto |= RB_HALT; 484 485 boothowto = howto; 486 if ((howto & RB_NOSYNC) == 0 && waittime < 0) { 487 /* 488 * Synchronize the disks.... 489 */ 490 waittime = 0; 491 vfs_shutdown(); 492 493 /* 494 * If we've been adjusting the clock, the todr 495 * will be out of synch; adjust it now. 496 */ 497 resettodr(); 498 } 499 500 /* Disable interrupts. */ 501 splhigh(); 502 503 /* If rebooting and a dump is requested do it. */ 504 #if 0 505 if ((howto & (RB_DUMP | RB_HALT)) == RB_DUMP) 506 #else 507 if (howto & RB_DUMP) 508 #endif 509 dumpsys(); 510 511 haltsys: 512 513 /* run any shutdown hooks */ 514 doshutdownhooks(); 515 516 pmf_system_shutdown(boothowto); 517 518 if ((howto & RB_POWERDOWN) == RB_POWERDOWN) 519 prom_halt(0x80); /* rom monitor RB_PWOFF */ 520 521 /* Finally, halt/reboot the system. */ 522 printf("%s\n\n", howto & RB_HALT ? "halted." : "rebooting..."); 523 prom_halt(howto & RB_HALT); 524 /*NOTREACHED*/ 525 } 526 527 int 528 initcpu(void) 529 { 530 spl0(); /* safe to turn interrupts on now */ 531 return 0; 532 } 533 534 static void 535 unimpl_cons_init(void) 536 { 537 538 panic("sysconf.init didn't set cons_init"); 539 } 540 541 static void 542 unimpl_iointr(u_int mask, u_int pc, u_int statusreg, u_int causereg) 543 { 544 545 panic("sysconf.init didn't set intr"); 546 } 547 548 static int 549 unimpl_memsize(void *first) 550 { 551 552 panic("sysconf.init didn't set memsize"); 553 } 554 555 void 556 unimpl_intr_establish(int level, int (*func)(void *), void *arg) 557 { 558 panic("sysconf.init didn't init intr_establish"); 559 } 560 561 void 562 delay(int n) 563 { 564 DELAY(n); 565 } 566 567 /* 568 * Find out how much memory is available by testing memory. 569 * Be careful to save and restore the original contents for msgbuf. 570 */ 571 int 572 memsize_scan(void *first) 573 { 574 volatile int *vp, *vp0; 575 int mem, tmp, tmp0; 576 577 #define PATTERN1 0xa5a5a5a5 578 #define PATTERN2 ~PATTERN1 579 580 /* 581 * Non destructive scan of memory to determine the size 582 * Use the first page to test for memory aliases. This 583 * also has the side effect of flushing the bus alignment 584 * buffer 585 */ 586 mem = btoc((paddr_t)first - MIPS_KSEG0_START); 587 vp = (int *)MIPS_PHYS_TO_KSEG1(mem << PGSHIFT); 588 vp0 = (int *)MIPS_PHYS_TO_KSEG1(0); /* Start of physical memory */ 589 tmp0 = *vp0; 590 while (vp < (int *)MIPS_MAX_MEM_ADDR) { 591 tmp = *vp; 592 *vp = PATTERN1; 593 *vp0 = PATTERN2; 594 wbflush(); 595 if (*vp != PATTERN1) 596 break; 597 *vp = PATTERN2; 598 *vp0 = PATTERN1; 599 wbflush(); 600 if (*vp != PATTERN2) 601 break; 602 *vp = tmp; 603 vp += PAGE_SIZE/sizeof(int); 604 mem++; 605 } 606 *vp0 = tmp0; 607 return mem; 608 } 609 610 /* 611 * Console initialization: called early on from main, 612 * before vm init or startup. Do enough configuration 613 * to choose and initialize a console. 614 */ 615 616 static void 617 null_cnprobe(struct consdev *cn) 618 { 619 } 620 621 static void 622 prom_cninit(struct consdev *cn) 623 { 624 extern const struct cdevsw cons_cdevsw; 625 626 cn->cn_dev = makedev(cdevsw_lookup_major(&cons_cdevsw), 0); 627 cn->cn_pri = CN_REMOTE; 628 } 629 630 static int 631 prom_cngetc(dev_t dev) 632 { 633 return MIPS_PROM(getchar)(); 634 } 635 636 static void 637 prom_cnputc(dev_t dev, int c) 638 { 639 MIPS_PROM(putchar)(c); 640 } 641 642 static void 643 null_cnpollc(dev_t dev, int on) 644 { 645 } 646 647 void 648 consinit(void) 649 { 650 int zs_unit; 651 652 zs_unit = 0; 653 cn_tab = &consdev_zs; 654 655 (*cn_tab->cn_init)(cn_tab); 656 } 657