1 /* $NetBSD: machdep.c,v 1.76 2012/07/28 23:08:56 matt Exp $ */ 2 3 /* 4 * Copyright (c) 1988 University of Utah. 5 * Copyright (c) 1992, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * the Systems Programming Group of the University of Utah Computer 10 * Science Department, The Mach Operating System project at 11 * Carnegie-Mellon University and Ralph Campbell. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * @(#)machdep.c 8.3 (Berkeley) 1/12/94 38 */ 39 40 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 41 42 __KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.76 2012/07/28 23:08:56 matt Exp $"); 43 44 /* from: Utah Hdr: machdep.c 1.63 91/04/24 */ 45 46 #include "opt_ddb.h" 47 #include "opt_kgdb.h" 48 #include "opt_modular.h" 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/signalvar.h> 53 #include <sys/kernel.h> 54 #include <sys/proc.h> 55 #include <sys/buf.h> 56 #include <sys/reboot.h> 57 #include <sys/conf.h> 58 #include <sys/file.h> 59 #include <sys/callout.h> 60 #include <sys/malloc.h> 61 #include <sys/mbuf.h> 62 #include <sys/msgbuf.h> 63 #include <sys/ioctl.h> 64 #include <sys/device.h> 65 #include <sys/exec.h> 66 #include <sys/mount.h> 67 #include <sys/syscallargs.h> 68 #include <sys/kcore.h> 69 #include <sys/ksyms.h> 70 71 #include <uvm/uvm_extern.h> 72 73 #include <ufs/mfs/mfs_extern.h> /* mfs_initminiroot() */ 74 75 #include <machine/cpu.h> 76 #include <machine/reg.h> 77 #include <machine/psl.h> 78 #include <machine/pte.h> 79 80 #ifdef DDB 81 #include <machine/db_machdep.h> 82 #include <ddb/db_extern.h> 83 #endif 84 85 #include <machine/intr.h> 86 #include <machine/mainboard.h> 87 #include <machine/sysconf.h> 88 #include <machine/autoconf.h> 89 #include <machine/bootinfo.h> 90 #include <machine/prom.h> 91 #include <dev/clock_subr.h> 92 #include <dev/cons.h> 93 94 #include <sys/boot_flag.h> 95 96 #include "opt_execfmt.h" 97 98 #include "zsc.h" /* XXX */ 99 #include "com.h" /* XXX */ 100 #include "ksyms.h" 101 102 /* maps for VM objects */ 103 104 struct vm_map *phys_map = NULL; 105 106 char *bootinfo = NULL; /* pointer to bootinfo structure */ 107 108 phys_ram_seg_t mem_clusters[VM_PHYSSEG_MAX]; 109 int mem_cluster_cnt; 110 111 void to_monitor(int) __dead; 112 void prom_halt(int) __dead; 113 114 #ifdef KGDB 115 void zs_kgdb_init(void); 116 void kgdb_connect(int); 117 #endif 118 119 /* 120 * Local functions. 121 */ 122 int initcpu(void); 123 void configure(void); 124 125 void mach_init(int, char *[], char*[], u_int, char *); 126 int memsize_scan(void *); 127 128 #ifdef DEBUG 129 /* stacktrace code violates prototypes to get callee's registers */ 130 extern void stacktrace(void); /*XXX*/ 131 #endif 132 133 /* locore callback-vector setup */ 134 extern void prom_init(void); 135 extern void pizazz_init(void); 136 137 /* platform-specific initialization vector */ 138 static void unimpl_cons_init(void); 139 static void unimpl_iointr(uint32_t, vaddr_t, uint32_t); 140 static int unimpl_memsize(void *); 141 static void unimpl_intr_establish(int, int (*)(void *), void *); 142 143 struct platform platform = { 144 .iobus = "iobus not set", 145 .cons_init = unimpl_cons_init, 146 .iointr = unimpl_iointr, 147 .memsize = unimpl_memsize, 148 .intr_establish = unimpl_intr_establish, 149 .clkinit = NULL, 150 }; 151 152 extern struct consdev consdev_prom; 153 extern struct consdev consdev_zs; 154 155 static void null_cnprobe(struct consdev *); 156 static void prom_cninit(struct consdev *); 157 static int prom_cngetc(dev_t); 158 static void prom_cnputc(dev_t, int); 159 static void null_cnpollc(dev_t, int); 160 161 struct consdev consdev_prom = { 162 null_cnprobe, 163 prom_cninit, 164 prom_cngetc, 165 prom_cnputc, 166 null_cnpollc, 167 }; 168 169 170 /* 171 * Do all the stuff that locore normally does before calling main(). 172 * Process arguments passed to us by the prom monitor. 173 * Return the first page address following the system. 174 */ 175 void 176 mach_init(int argc, char *argv[], char *envp[], u_int bim, char *bip) 177 { 178 u_long first, last; 179 char *kernend; 180 char *cp; 181 int i, howto; 182 extern char edata[], end[]; 183 const char *bi_msg; 184 #if NKSYMS || defined(DDB) || defined(MODULAR) 185 int nsym = 0; 186 char *ssym = 0; 187 char *esym = 0; 188 struct btinfo_symtab *bi_syms; 189 #endif 190 191 /* Check for valid bootinfo passed from bootstrap */ 192 if (bim == BOOTINFO_MAGIC) { 193 struct btinfo_magic *bi_magic; 194 195 bootinfo = (char *)BOOTINFO_ADDR; /* XXX */ 196 bi_magic = lookup_bootinfo(BTINFO_MAGIC); 197 if (bi_magic == NULL || bi_magic->magic != BOOTINFO_MAGIC) 198 bi_msg = "invalid bootinfo structure.\n"; 199 else 200 bi_msg = NULL; 201 } else 202 bi_msg = "invalid bootinfo (standalone boot?)\n"; 203 204 /* clear the BSS segment */ 205 kernend = (void *)mips_round_page(end); 206 memset(edata, 0, end - edata); 207 208 /* 209 * Copy exception-dispatch code down to exception vector. 210 * Initialize locore-function vector. 211 * Clear out the I and D caches. 212 */ 213 mips_vector_init(NULL, false); 214 215 #if NKSYMS || defined(DDB) || defined(LKM) 216 bi_syms = lookup_bootinfo(BTINFO_SYMTAB); 217 218 /* Load sysmbol table if present */ 219 if (bi_syms != NULL) { 220 nsym = bi_syms->nsym; 221 ssym = (void *)bi_syms->ssym; 222 esym = (void *)bi_syms->esym; 223 kernend = (void *)mips_round_page(esym); 224 } 225 #endif 226 227 prom_init(); 228 consinit(); 229 230 if (bi_msg != NULL) 231 printf(bi_msg); 232 233 /* 234 * Set the VM page size. 235 */ 236 uvm_setpagesize(); 237 238 /* Find out how much memory is available. */ 239 physmem = memsize_scan(kernend); 240 241 /* 242 * Now that we know how much memory we have, initialize the 243 * mem cluster array. 244 */ 245 mem_clusters[0].start = 0; /* XXX is this correct? */ 246 mem_clusters[0].size = ctob(physmem); 247 mem_cluster_cnt = 1; 248 249 /* Look at argv[0] and compute bootdev */ 250 makebootdev(argv[0]); 251 252 /* 253 * Look at arguments passed to us and compute boothowto. 254 */ 255 boothowto = RB_AUTOBOOT; 256 for (i = 1; i < argc; i++) { 257 for (cp = argv[i]; *cp; cp++) { 258 /* Ignore superfluous '-', if there is one */ 259 if (*cp == '-') 260 continue; 261 262 howto = 0; 263 BOOT_FLAG(*cp, howto); 264 if (! howto) 265 printf("bootflag '%c' not recognised\n", *cp); 266 else 267 boothowto |= howto; 268 } 269 } 270 271 272 #if NKSYMS || defined(DDB) || defined(MODULAR) 273 /* init symbols if present */ 274 if (esym) 275 ksyms_addsyms_elf(esym - ssym, ssym, esym); 276 #endif 277 #ifdef DDB 278 if (boothowto & RB_KDB) 279 Debugger(); 280 #endif 281 #ifdef KGDB 282 zs_kgdb_init(); /* XXX */ 283 if (boothowto & RB_KDB) 284 kgdb_connect(0); 285 #endif 286 287 /* 288 * Check to see if a mini-root was loaded into memory. It resides 289 * at the start of the next page just after the end of BSS. 290 */ 291 if (boothowto & RB_MINIROOT) 292 kernend += round_page(mfs_initminiroot(kernend)); 293 294 /* 295 * Load the rest of the available pages into the VM system. 296 */ 297 first = round_page(MIPS_KSEG0_TO_PHYS(kernend)); 298 last = mem_clusters[0].start + mem_clusters[0].size; 299 uvm_page_physload(atop(first), atop(last), atop(first), atop(last), 300 VM_FREELIST_DEFAULT); 301 302 /* 303 * Initialize error message buffer (at end of core). 304 */ 305 mips_init_msgbuf(); 306 307 /* 308 * Initialize the virtual memory system. 309 */ 310 pmap_bootstrap(); 311 312 /* 313 * Allocate uarea page for lwp0 and set it. 314 */ 315 mips_init_lwp0_uarea(); 316 317 /* 318 * Set up interrupt handling and I/O addresses. 319 */ 320 pizazz_init(); 321 } 322 323 324 325 /* 326 * cpu_startup: allocate memory for variable-sized tables, 327 * initialize CPU, and do autoconfiguration. 328 */ 329 void 330 cpu_startup(void) 331 { 332 vaddr_t minaddr, maxaddr; 333 char pbuf[9]; 334 #ifdef DEBUG 335 extern int pmapdebug; 336 int opmapdebug = pmapdebug; 337 338 pmapdebug = 0; 339 #endif 340 341 /* 342 * Good {morning,afternoon,evening,night}. 343 */ 344 printf("%s%s", copyright, version); 345 printf("%s\n", cpu_model); 346 format_bytes(pbuf, sizeof(pbuf), ctob(physmem)); 347 printf("total memory = %s\n", pbuf); 348 349 minaddr = 0; 350 /* 351 * Allocate a submap for physio 352 */ 353 phys_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr, 354 VM_PHYS_SIZE, true, false, NULL); 355 356 /* 357 * No need to allocate an mbuf cluster submap. Mbuf clusters 358 * are allocated via the pool allocator, and we use KSEG to 359 * map those pages. 360 */ 361 362 #ifdef DEBUG 363 pmapdebug = opmapdebug; 364 #endif 365 format_bytes(pbuf, sizeof(pbuf), ptoa(uvmexp.free)); 366 printf("avail memory = %s\n", pbuf); 367 } 368 369 /* 370 * Look up information in bootinfo of boot loader. 371 */ 372 void * 373 lookup_bootinfo(int type) 374 { 375 struct btinfo_common *bt; 376 char *help = bootinfo; 377 378 /* Check for a bootinfo record first. */ 379 if (help == NULL) 380 return (NULL); 381 382 do { 383 bt = (struct btinfo_common *)help; 384 if (bt->type == type) 385 return ((void *)help); 386 help += bt->next; 387 } while (bt->next != 0 && 388 (size_t)help < (size_t)bootinfo + BOOTINFO_SIZE); 389 390 return (NULL); 391 } 392 393 int waittime = -1; 394 395 /* 396 * call PROM to halt or reboot. 397 */ 398 void 399 prom_halt(int howto) 400 { 401 if (howto & RB_HALT) 402 MIPS_PROM(reinit)(); 403 MIPS_PROM(reboot)(); 404 /* NOTREACHED */ 405 } 406 407 void 408 cpu_reboot(volatile int howto, char *bootstr) 409 { 410 /* take a snap shot before clobbering any registers */ 411 savectx(curpcb); 412 413 #ifdef DEBUG 414 if (panicstr) 415 stacktrace(); 416 #endif 417 418 /* If system is cold, just halt. */ 419 if (cold) { 420 howto |= RB_HALT; 421 goto haltsys; 422 } 423 424 /* If "always halt" was specified as a boot flag, obey. */ 425 if ((boothowto & RB_HALT) != 0) 426 howto |= RB_HALT; 427 428 boothowto = howto; 429 if ((howto & RB_NOSYNC) == 0 && waittime < 0) { 430 /* 431 * Synchronize the disks.... 432 */ 433 waittime = 0; 434 vfs_shutdown(); 435 436 /* 437 * If we've been adjusting the clock, the todr 438 * will be out of synch; adjust it now. 439 */ 440 resettodr(); 441 } 442 443 /* Disable interrupts. */ 444 splhigh(); 445 446 /* If rebooting and a dump is requested do it. */ 447 #if 0 448 if ((howto & (RB_DUMP | RB_HALT)) == RB_DUMP) 449 #else 450 if (howto & RB_DUMP) 451 #endif 452 dumpsys(); 453 454 haltsys: 455 456 /* run any shutdown hooks */ 457 doshutdownhooks(); 458 459 pmf_system_shutdown(boothowto); 460 461 if ((howto & RB_POWERDOWN) == RB_POWERDOWN) 462 prom_halt(0x80); /* rom monitor RB_PWOFF */ 463 464 /* Finally, halt/reboot the system. */ 465 printf("%s\n\n", howto & RB_HALT ? "halted." : "rebooting..."); 466 prom_halt(howto & RB_HALT); 467 /*NOTREACHED*/ 468 } 469 470 int 471 initcpu(void) 472 { 473 spl0(); /* safe to turn interrupts on now */ 474 return 0; 475 } 476 477 static void 478 unimpl_cons_init(void) 479 { 480 481 panic("sysconf.init didn't set cons_init"); 482 } 483 484 static void 485 unimpl_iointr(uint32_t status, vaddr_t pc, uint32_t ipending) 486 { 487 488 panic("sysconf.init didn't set intr"); 489 } 490 491 static int 492 unimpl_memsize(void *first) 493 { 494 495 panic("sysconf.init didn't set memsize"); 496 } 497 498 void 499 unimpl_intr_establish(int level, int (*func)(void *), void *arg) 500 { 501 panic("sysconf.init didn't init intr_establish"); 502 } 503 504 void 505 delay(int n) 506 { 507 DELAY(n); 508 } 509 510 /* 511 * Find out how much memory is available by testing memory. 512 * Be careful to save and restore the original contents for msgbuf. 513 */ 514 int 515 memsize_scan(void *first) 516 { 517 volatile int *vp, *vp0; 518 int mem, tmp, tmp0; 519 520 #define PATTERN1 0xa5a5a5a5 521 #define PATTERN2 ~PATTERN1 522 523 /* 524 * Non destructive scan of memory to determine the size 525 * Use the first page to test for memory aliases. This 526 * also has the side effect of flushing the bus alignment 527 * buffer 528 */ 529 mem = btoc((paddr_t)first - MIPS_KSEG0_START); 530 vp = (int *)MIPS_PHYS_TO_KSEG1(mem << PGSHIFT); 531 vp0 = (int *)MIPS_PHYS_TO_KSEG1(0); /* Start of physical memory */ 532 tmp0 = *vp0; 533 while (vp < (int *)MIPS_MAX_MEM_ADDR) { 534 tmp = *vp; 535 *vp = PATTERN1; 536 *vp0 = PATTERN2; 537 wbflush(); 538 if (*vp != PATTERN1) 539 break; 540 *vp = PATTERN2; 541 *vp0 = PATTERN1; 542 wbflush(); 543 if (*vp != PATTERN2) 544 break; 545 *vp = tmp; 546 vp += PAGE_SIZE/sizeof(int); 547 mem++; 548 } 549 *vp0 = tmp0; 550 return mem; 551 } 552 553 /* 554 * Console initialization: called early on from main, 555 * before vm init or startup. Do enough configuration 556 * to choose and initialize a console. 557 */ 558 559 static void 560 null_cnprobe(struct consdev *cn) 561 { 562 } 563 564 static void 565 prom_cninit(struct consdev *cn) 566 { 567 extern const struct cdevsw cons_cdevsw; 568 569 cn->cn_dev = makedev(cdevsw_lookup_major(&cons_cdevsw), 0); 570 cn->cn_pri = CN_REMOTE; 571 } 572 573 static int 574 prom_cngetc(dev_t dev) 575 { 576 return MIPS_PROM(getchar)(); 577 } 578 579 static void 580 prom_cnputc(dev_t dev, int c) 581 { 582 MIPS_PROM(putchar)(c); 583 } 584 585 static void 586 null_cnpollc(dev_t dev, int on) 587 { 588 } 589 590 void 591 consinit(void) 592 { 593 int zs_unit; 594 595 zs_unit = 0; 596 cn_tab = &consdev_zs; 597 598 (*cn_tab->cn_init)(cn_tab); 599 } 600