1 /* $NetBSD: machdep.c,v 1.69 2009/11/27 03:23:11 rmind 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 1.69 2009/11/27 03:23:11 rmind 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 struct pcb *pcb0; 233 char *kernend; 234 vaddr_t v; 235 char *cp; 236 int i, howto; 237 extern char edata[], end[]; 238 const char *bi_msg; 239 #if NKSYMS || defined(DDB) || defined(MODULAR) 240 int nsym = 0; 241 char *ssym = 0; 242 char *esym = 0; 243 struct btinfo_symtab *bi_syms; 244 #endif 245 246 247 /* Check for valid bootinfo passed from bootstrap */ 248 if (bim == BOOTINFO_MAGIC) { 249 struct btinfo_magic *bi_magic; 250 251 bootinfo = (char *)BOOTINFO_ADDR; /* XXX */ 252 bi_magic = lookup_bootinfo(BTINFO_MAGIC); 253 if (bi_magic == NULL || bi_magic->magic != BOOTINFO_MAGIC) 254 bi_msg = "invalid bootinfo structure.\n"; 255 else 256 bi_msg = NULL; 257 } else 258 bi_msg = "invalid bootinfo (standalone boot?)\n"; 259 260 /* clear the BSS segment */ 261 kernend = (void *)mips_round_page(end); 262 memset(edata, 0, end - edata); 263 264 #if NKSYMS || defined(DDB) || defined(MODULAR) 265 bi_syms = lookup_bootinfo(BTINFO_SYMTAB); 266 267 /* Load sysmbol table if present */ 268 if (bi_syms != NULL) { 269 nsym = bi_syms->nsym; 270 ssym = (void *)bi_syms->ssym; 271 esym = (void *)bi_syms->esym; 272 kernend = (void *)mips_round_page(esym); 273 } 274 #endif 275 276 prom_init(); 277 consinit(); 278 279 if (bi_msg != NULL) 280 printf(bi_msg); 281 282 /* 283 * Set the VM page size. 284 */ 285 uvm_setpagesize(); 286 287 /* Find out how much memory is available. */ 288 physmem = memsize_scan(kernend); 289 290 /* 291 * Now that we know how much memory we have, initialize the 292 * mem cluster array. 293 */ 294 mem_clusters[0].start = 0; /* XXX is this correct? */ 295 mem_clusters[0].size = ctob(physmem); 296 mem_cluster_cnt = 1; 297 298 /* 299 * Copy exception-dispatch code down to exception vector. 300 * Initialize locore-function vector. 301 * Clear out the I and D caches. 302 */ 303 mips_vector_init(); 304 305 /* Look at argv[0] and compute bootdev */ 306 makebootdev(argv[0]); 307 308 /* 309 * Look at arguments passed to us and compute boothowto. 310 */ 311 boothowto = RB_AUTOBOOT; 312 for (i = 1; i < argc; i++) { 313 for (cp = argv[i]; *cp; cp++) { 314 /* Ignore superfluous '-', if there is one */ 315 if (*cp == '-') 316 continue; 317 318 howto = 0; 319 BOOT_FLAG(*cp, howto); 320 if (! howto) 321 printf("bootflag '%c' not recognised\n", *cp); 322 else 323 boothowto |= howto; 324 } 325 } 326 327 328 #if NKSYMS || defined(DDB) || defined(MODULAR) 329 /* init symbols if present */ 330 if (esym) 331 ksyms_addsyms_elf(esym - ssym, ssym, esym); 332 #endif 333 #ifdef DDB 334 if (boothowto & RB_KDB) 335 Debugger(); 336 #endif 337 #ifdef KGDB 338 zs_kgdb_init(); /* XXX */ 339 if (boothowto & RB_KDB) 340 kgdb_connect(0); 341 #endif 342 343 #ifdef MFS 344 /* 345 * Check to see if a mini-root was loaded into memory. It resides 346 * at the start of the next page just after the end of BSS. 347 */ 348 if (boothowto & RB_MINIROOT) 349 kernend += round_page(mfs_initminiroot(kernend)); 350 #endif 351 352 /* 353 * Load the rest of the available pages into the VM system. 354 */ 355 first = round_page(MIPS_KSEG0_TO_PHYS(kernend)); 356 last = mem_clusters[0].start + mem_clusters[0].size; 357 uvm_page_physload(atop(first), atop(last), atop(first), atop(last), 358 VM_FREELIST_DEFAULT); 359 360 /* 361 * Initialize error message buffer (at end of core). 362 */ 363 mips_init_msgbuf(); 364 365 /* 366 * Initialize the virtual memory system. 367 */ 368 pmap_bootstrap(); 369 370 /* 371 * Allocate uarea page for lwp0 and set it. 372 */ 373 v = uvm_pageboot_alloc(USPACE); 374 uvm_lwp_setuarea(&lwp0, v); 375 376 pcb0 = lwp_getpcb(&lwp0); 377 pcb0->pcb_context[11] = MIPS_INT_MASK | MIPS_SR_INT_IE; /* SR */ 378 379 lwp0.l_md.md_regs = (struct frame *)(v + USPACE) - 1; 380 381 /* 382 * Set up interrupt handling and I/O addresses. 383 */ 384 pizazz_init(); 385 } 386 387 388 389 /* 390 * cpu_startup: allocate memory for variable-sized tables, 391 * initialize CPU, and do autoconfiguration. 392 */ 393 void 394 cpu_startup(void) 395 { 396 vaddr_t minaddr, maxaddr; 397 char pbuf[9]; 398 #ifdef DEBUG 399 extern int pmapdebug; 400 int opmapdebug = pmapdebug; 401 402 pmapdebug = 0; 403 #endif 404 405 /* 406 * Good {morning,afternoon,evening,night}. 407 */ 408 printf("%s%s", copyright, version); 409 printf("%s\n", cpu_model); 410 format_bytes(pbuf, sizeof(pbuf), ctob(physmem)); 411 printf("total memory = %s\n", pbuf); 412 413 minaddr = 0; 414 /* 415 * Allocate a submap for physio 416 */ 417 phys_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr, 418 VM_PHYS_SIZE, true, false, NULL); 419 420 /* 421 * No need to allocate an mbuf cluster submap. Mbuf clusters 422 * are allocated via the pool allocator, and we use KSEG to 423 * map those pages. 424 */ 425 426 #ifdef DEBUG 427 pmapdebug = opmapdebug; 428 #endif 429 format_bytes(pbuf, sizeof(pbuf), ptoa(uvmexp.free)); 430 printf("avail memory = %s\n", pbuf); 431 } 432 433 /* 434 * Look up information in bootinfo of boot loader. 435 */ 436 void * 437 lookup_bootinfo(int type) 438 { 439 struct btinfo_common *bt; 440 char *help = bootinfo; 441 442 /* Check for a bootinfo record first. */ 443 if (help == NULL) 444 return (NULL); 445 446 do { 447 bt = (struct btinfo_common *)help; 448 if (bt->type == type) 449 return ((void *)help); 450 help += bt->next; 451 } while (bt->next != 0 && 452 (size_t)help < (size_t)bootinfo + BOOTINFO_SIZE); 453 454 return (NULL); 455 } 456 457 int waittime = -1; 458 459 /* 460 * call PROM to halt or reboot. 461 */ 462 void 463 prom_halt(int howto) 464 { 465 if (howto & RB_HALT) 466 MIPS_PROM(reinit)(); 467 MIPS_PROM(reboot)(); 468 /* NOTREACHED */ 469 } 470 471 void 472 cpu_reboot(volatile int howto, char *bootstr) 473 { 474 /* take a snap shot before clobbering any registers */ 475 if (curlwp) 476 savectx(curpcb); 477 478 #ifdef DEBUG 479 if (panicstr) 480 stacktrace(); 481 #endif 482 483 /* If system is cold, just halt. */ 484 if (cold) { 485 howto |= RB_HALT; 486 goto haltsys; 487 } 488 489 /* If "always halt" was specified as a boot flag, obey. */ 490 if ((boothowto & RB_HALT) != 0) 491 howto |= RB_HALT; 492 493 boothowto = howto; 494 if ((howto & RB_NOSYNC) == 0 && waittime < 0) { 495 /* 496 * Synchronize the disks.... 497 */ 498 waittime = 0; 499 vfs_shutdown(); 500 501 /* 502 * If we've been adjusting the clock, the todr 503 * will be out of synch; adjust it now. 504 */ 505 resettodr(); 506 } 507 508 /* Disable interrupts. */ 509 splhigh(); 510 511 /* If rebooting and a dump is requested do it. */ 512 #if 0 513 if ((howto & (RB_DUMP | RB_HALT)) == RB_DUMP) 514 #else 515 if (howto & RB_DUMP) 516 #endif 517 dumpsys(); 518 519 haltsys: 520 521 /* run any shutdown hooks */ 522 doshutdownhooks(); 523 524 pmf_system_shutdown(boothowto); 525 526 if ((howto & RB_POWERDOWN) == RB_POWERDOWN) 527 prom_halt(0x80); /* rom monitor RB_PWOFF */ 528 529 /* Finally, halt/reboot the system. */ 530 printf("%s\n\n", howto & RB_HALT ? "halted." : "rebooting..."); 531 prom_halt(howto & RB_HALT); 532 /*NOTREACHED*/ 533 } 534 535 int 536 initcpu(void) 537 { 538 spl0(); /* safe to turn interrupts on now */ 539 return 0; 540 } 541 542 static void 543 unimpl_cons_init(void) 544 { 545 546 panic("sysconf.init didn't set cons_init"); 547 } 548 549 static void 550 unimpl_iointr(u_int mask, u_int pc, u_int statusreg, u_int causereg) 551 { 552 553 panic("sysconf.init didn't set intr"); 554 } 555 556 static int 557 unimpl_memsize(void *first) 558 { 559 560 panic("sysconf.init didn't set memsize"); 561 } 562 563 void 564 unimpl_intr_establish(int level, int (*func)(void *), void *arg) 565 { 566 panic("sysconf.init didn't init intr_establish"); 567 } 568 569 void 570 delay(int n) 571 { 572 DELAY(n); 573 } 574 575 /* 576 * Find out how much memory is available by testing memory. 577 * Be careful to save and restore the original contents for msgbuf. 578 */ 579 int 580 memsize_scan(void *first) 581 { 582 volatile int *vp, *vp0; 583 int mem, tmp, tmp0; 584 585 #define PATTERN1 0xa5a5a5a5 586 #define PATTERN2 ~PATTERN1 587 588 /* 589 * Non destructive scan of memory to determine the size 590 * Use the first page to test for memory aliases. This 591 * also has the side effect of flushing the bus alignment 592 * buffer 593 */ 594 mem = btoc((paddr_t)first - MIPS_KSEG0_START); 595 vp = (int *)MIPS_PHYS_TO_KSEG1(mem << PGSHIFT); 596 vp0 = (int *)MIPS_PHYS_TO_KSEG1(0); /* Start of physical memory */ 597 tmp0 = *vp0; 598 while (vp < (int *)MIPS_MAX_MEM_ADDR) { 599 tmp = *vp; 600 *vp = PATTERN1; 601 *vp0 = PATTERN2; 602 wbflush(); 603 if (*vp != PATTERN1) 604 break; 605 *vp = PATTERN2; 606 *vp0 = PATTERN1; 607 wbflush(); 608 if (*vp != PATTERN2) 609 break; 610 *vp = tmp; 611 vp += PAGE_SIZE/sizeof(int); 612 mem++; 613 } 614 *vp0 = tmp0; 615 return mem; 616 } 617 618 /* 619 * Console initialization: called early on from main, 620 * before vm init or startup. Do enough configuration 621 * to choose and initialize a console. 622 */ 623 624 static void 625 null_cnprobe(struct consdev *cn) 626 { 627 } 628 629 static void 630 prom_cninit(struct consdev *cn) 631 { 632 extern const struct cdevsw cons_cdevsw; 633 634 cn->cn_dev = makedev(cdevsw_lookup_major(&cons_cdevsw), 0); 635 cn->cn_pri = CN_REMOTE; 636 } 637 638 static int 639 prom_cngetc(dev_t dev) 640 { 641 return MIPS_PROM(getchar)(); 642 } 643 644 static void 645 prom_cnputc(dev_t dev, int c) 646 { 647 MIPS_PROM(putchar)(c); 648 } 649 650 static void 651 null_cnpollc(dev_t dev, int on) 652 { 653 } 654 655 void 656 consinit(void) 657 { 658 int zs_unit; 659 660 zs_unit = 0; 661 cn_tab = &consdev_zs; 662 663 (*cn_tab->cn_init)(cn_tab); 664 } 665