1 /* 2 * Copyright (c) 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This software was developed by the Computer Systems Engineering group 6 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 7 * contributed to Berkeley. 8 * 9 * All advertising materials mentioning features or use of this software 10 * must display the following acknowledgement: 11 * This product includes software developed by the University of 12 * California, Lawrence Berkeley Laboratory. 13 * 14 * %sccs.include.redist.c% 15 * 16 * @(#)machdep.c 8.6 (Berkeley) 01/14/94 17 * 18 * from: $Header: machdep.c,v 1.44 93/10/31 05:28:36 torek Exp $ 19 */ 20 21 #include <sys/param.h> 22 #include <sys/proc.h> 23 #include <sys/user.h> 24 #include <sys/map.h> 25 #include <sys/buf.h> 26 #include <sys/device.h> 27 #include <sys/reboot.h> 28 #include <sys/systm.h> 29 #include <sys/conf.h> 30 #include <sys/file.h> 31 #include <sys/clist.h> 32 #include <sys/callout.h> 33 #include <sys/malloc.h> 34 #include <sys/mbuf.h> 35 #include <sys/mount.h> 36 #include <sys/msgbuf.h> 37 #ifdef SYSVSHM 38 #include <sys/shm.h> 39 #endif 40 #include <sys/exec.h> 41 #include <sys/sysctl.h> 42 43 #include <machine/autoconf.h> 44 #include <machine/frame.h> 45 #include <machine/cpu.h> 46 47 #include <vm/vm_kern.h> 48 #include <vm/vm_page.h> 49 50 #include <sparc/sparc/asm.h> 51 #include <sparc/sparc/cache.h> 52 #include <sparc/sparc/vaddrs.h> 53 54 vm_map_t buffer_map; 55 extern vm_offset_t avail_end; 56 57 /* 58 * Declare these as initialized data so we can patch them. 59 */ 60 int nswbuf = 0; 61 #ifdef NBUF 62 int nbuf = NBUF; 63 #else 64 int nbuf = 0; 65 #endif 66 #ifdef BUFPAGES 67 int bufpages = BUFPAGES; 68 #else 69 int bufpages = 0; 70 #endif 71 72 int physmem; 73 74 extern struct msgbuf msgbuf; 75 struct msgbuf *msgbufp = &msgbuf; 76 int msgbufmapped = 1; /* message buffer is always mapped */ 77 78 /* 79 * safepri is a safe priority for sleep to set for a spin-wait 80 * during autoconfiguration or after a panic. 81 */ 82 int safepri = 0; 83 84 caddr_t allocsys(); 85 86 /* 87 * Machine-dependent startup code 88 */ 89 cpu_startup() 90 { 91 register unsigned i; 92 register caddr_t v; 93 register int sz; 94 int base, residual; 95 #ifdef DEBUG 96 extern int pmapdebug; 97 int opmapdebug = pmapdebug; 98 #endif 99 vm_offset_t minaddr, maxaddr; 100 vm_size_t size; 101 102 #ifdef DEBUG 103 pmapdebug = 0; 104 #endif 105 106 /* 107 * Good {morning,afternoon,evening,night}. 108 */ 109 printf(version); 110 /*identifycpu();*/ 111 physmem = btoc(avail_end); 112 printf("real mem = %d\n", avail_end); 113 114 /* 115 * Find out how much space we need, allocate it, 116 * and then give everything true virtual addresses. 117 */ 118 sz = (int)allocsys((caddr_t)0); 119 if ((v = (caddr_t)kmem_alloc(kernel_map, round_page(sz))) == 0) 120 panic("startup: no room for tables"); 121 if (allocsys(v) - v != sz) 122 panic("startup: table size inconsistency"); 123 124 /* 125 * Now allocate buffers proper. They are different than the above 126 * in that they usually occupy more virtual memory than physical. 127 */ 128 size = MAXBSIZE * nbuf; 129 buffer_map = kmem_suballoc(kernel_map, (vm_offset_t *)&buffers, 130 &maxaddr, size, TRUE); 131 minaddr = (vm_offset_t)buffers; 132 if (vm_map_find(buffer_map, vm_object_allocate(size), (vm_offset_t)0, 133 &minaddr, size, FALSE) != KERN_SUCCESS) 134 panic("startup: cannot allocate buffers"); 135 base = bufpages / nbuf; 136 residual = bufpages % nbuf; 137 for (i = 0; i < nbuf; i++) { 138 vm_size_t curbufsize; 139 vm_offset_t curbuf; 140 141 /* 142 * First <residual> buffers get (base+1) physical pages 143 * allocated for them. The rest get (base) physical pages. 144 * 145 * The rest of each buffer occupies virtual space, 146 * but has no physical memory allocated for it. 147 */ 148 curbuf = (vm_offset_t)buffers + i * MAXBSIZE; 149 curbufsize = CLBYTES * (i < residual ? base+1 : base); 150 vm_map_pageable(buffer_map, curbuf, curbuf+curbufsize, FALSE); 151 vm_map_simplify(buffer_map, curbuf); 152 } 153 /* 154 * Allocate a submap for exec arguments. This map effectively 155 * limits the number of processes exec'ing at any time. 156 */ 157 exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, 158 16*NCARGS, TRUE); 159 /* 160 * Allocate a map for physio. Others use a submap of the kernel 161 * map, but we want one completely separate, even though it uses 162 * the same pmap. 163 */ 164 phys_map = vm_map_create(kernel_pmap, DVMA_BASE, DVMA_END, 1); 165 if (phys_map == NULL) 166 panic("unable to create DVMA map"); 167 168 /* 169 * Finally, allocate mbuf pool. Since mclrefcnt is an off-size 170 * we use the more space efficient malloc in place of kmem_alloc. 171 */ 172 mclrefcnt = (char *)malloc(NMBCLUSTERS+CLBYTES/MCLBYTES, 173 M_MBUF, M_NOWAIT); 174 bzero(mclrefcnt, NMBCLUSTERS+CLBYTES/MCLBYTES); 175 mb_map = kmem_suballoc(kernel_map, (vm_offset_t *)&mbutl, &maxaddr, 176 VM_MBUF_SIZE, FALSE); 177 /* 178 * Initialize callouts 179 */ 180 callfree = callout; 181 for (i = 1; i < ncallout; i++) 182 callout[i-1].c_next = &callout[i]; 183 callout[i-1].c_next = NULL; 184 185 #ifdef DEBUG 186 pmapdebug = opmapdebug; 187 #endif 188 printf("avail mem = %d\n", ptoa(cnt.v_free_count)); 189 printf("using %d buffers containing %d bytes of memory\n", 190 nbuf, bufpages * CLBYTES); 191 192 /* 193 * Set up buffers, so they can be used to read disk labels. 194 */ 195 bufinit(); 196 197 /* 198 * Configure the system, then turn on the cache. Should be able 199 * to do this earlier, but then esp.c fails on SS1+ boxes (??). 200 */ 201 configure(); 202 cache_enable(); 203 } 204 205 /* 206 * Allocate space for system data structures. We are given 207 * a starting virtual address and we return a final virtual 208 * address; along the way we set each data structure pointer. 209 * 210 * You call allocsys() with 0 to find out how much space we want, 211 * allocate that much and fill it with zeroes, and then call 212 * allocsys() again with the correct base virtual address. 213 */ 214 caddr_t 215 allocsys(v) 216 register caddr_t v; 217 { 218 219 #define valloc(name, type, num) \ 220 v = (caddr_t)(((name) = (type *)v) + (num)) 221 valloc(cfree, struct cblock, nclist); 222 valloc(callout, struct callout, ncallout); 223 valloc(swapmap, struct map, nswapmap = maxproc * 2); 224 #ifdef SYSVSHM 225 valloc(shmsegs, struct shmid_ds, shminfo.shmmni); 226 #endif 227 228 /* 229 * Determine how many buffers to allocate (enough to 230 * hold 5% of total physical memory, but at least 16). 231 * Allocate 1/2 as many swap buffer headers as file i/o buffers. 232 */ 233 if (bufpages == 0) 234 bufpages = (physmem / 20) / CLSIZE; 235 if (nbuf == 0) { 236 nbuf = bufpages; 237 if (nbuf < 16) 238 nbuf = 16; 239 } 240 if (nswbuf == 0) { 241 nswbuf = (nbuf / 2) &~ 1; /* force even */ 242 if (nswbuf > 256) 243 nswbuf = 256; /* sanity */ 244 } 245 valloc(swbuf, struct buf, nswbuf); 246 valloc(buf, struct buf, nbuf); 247 return (v); 248 } 249 250 /* 251 * Set up registers on exec. 252 * 253 * XXX this entire mess must be fixed 254 */ 255 /* ARGSUSED */ 256 setregs(p, entry, retval) 257 register struct proc *p; 258 u_long entry; 259 int retval[2]; 260 { 261 register struct trapframe *tf = p->p_md.md_tf; 262 register struct fpstate *fs; 263 register int psr, sp; 264 265 /* 266 * The syscall will ``return'' to npc or %g7 or %g2; set them all. 267 * Set the rest of the registers to 0 except for %o6 (stack pointer, 268 * built in exec()) and psr (retain CWP and PSR_S bits). 269 */ 270 psr = tf->tf_psr & (PSR_S | PSR_CWP); 271 sp = tf->tf_out[6]; 272 if ((fs = p->p_md.md_fpstate) != NULL) { 273 /* 274 * We hold an FPU state. If we own *the* FPU chip state 275 * we must get rid of it, and the only way to do that is 276 * to save it. In any case, get rid of our FPU state. 277 */ 278 if (p == fpproc) { 279 savefpstate(fs); 280 fpproc = NULL; 281 } 282 free((void *)fs, M_SUBPROC); 283 p->p_md.md_fpstate = NULL; 284 } 285 bzero((caddr_t)tf, sizeof *tf); 286 tf->tf_psr = psr; 287 tf->tf_global[2] = tf->tf_global[7] = tf->tf_npc = entry & ~3; 288 tf->tf_out[6] = sp; 289 retval[1] = 0; 290 } 291 292 #ifdef DEBUG 293 int sigdebug = 0; 294 int sigpid = 0; 295 #define SDB_FOLLOW 0x01 296 #define SDB_KSTACK 0x02 297 #define SDB_FPSTATE 0x04 298 #endif 299 300 struct sigframe { 301 int sf_signo; /* signal number */ 302 int sf_code; /* code */ 303 #ifdef COMPAT_SUNOS 304 struct sigcontext *sf_scp; /* points to user addr of sigcontext */ 305 #else 306 int sf_xxx; /* placeholder */ 307 #endif 308 int sf_addr; /* SunOS compat, always 0 for now */ 309 struct sigcontext sf_sc; /* actual sigcontext */ 310 }; 311 312 /* 313 * machine dependent system variables. 314 */ 315 cpu_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 316 int *name; 317 u_int namelen; 318 void *oldp; 319 size_t *oldlenp; 320 void *newp; 321 size_t newlen; 322 struct proc *p; 323 { 324 325 /* all sysctl names are this level are terminal */ 326 if (namelen != 1) 327 return (ENOTDIR); /* overloaded */ 328 329 switch (name[0]) { 330 default: 331 return (EOPNOTSUPP); 332 } 333 /* NOTREACHED */ 334 } 335 336 /* 337 * Send an interrupt to process. 338 */ 339 void 340 sendsig(catcher, sig, mask, code) 341 sig_t catcher; 342 int sig, mask; 343 unsigned code; 344 { 345 register struct proc *p = curproc; 346 register struct sigacts *psp = p->p_sigacts; 347 register struct sigframe *fp; 348 register struct trapframe *tf; 349 register int addr, oonstack, oldsp, newsp; 350 struct sigframe sf; 351 extern char sigcode[], esigcode[]; 352 #define szsigcode (esigcode - sigcode) 353 354 tf = p->p_md.md_tf; 355 oldsp = tf->tf_out[6]; 356 oonstack = psp->ps_sigstk.ss_flags & SA_ONSTACK; 357 /* 358 * Compute new user stack addresses, subtract off 359 * one signal frame, and align. 360 */ 361 if ((psp->ps_flags & SAS_ALTSTACK) && !oonstack && 362 (psp->ps_sigonstack & sigmask(sig))) { 363 fp = (struct sigframe *)(psp->ps_sigstk.ss_base + 364 psp->ps_sigstk.ss_size); 365 psp->ps_sigstk.ss_flags |= SA_ONSTACK; 366 } else 367 fp = (struct sigframe *)oldsp; 368 fp = (struct sigframe *)((int)(fp - 1) & ~7); 369 370 #ifdef DEBUG 371 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 372 printf("sendsig: %s[%d] sig %d newusp %x scp %x\n", 373 p->p_comm, p->p_pid, sig, fp, &fp->sf_sc); 374 #endif 375 /* 376 * Now set up the signal frame. We build it in kernel space 377 * and then copy it out. We probably ought to just build it 378 * directly in user space.... 379 */ 380 sf.sf_signo = sig; 381 sf.sf_code = code; 382 #ifdef COMPAT_SUNOS 383 sf.sf_scp = &fp->sf_sc; 384 #endif 385 sf.sf_addr = 0; /* XXX */ 386 387 /* 388 * Build the signal context to be used by sigreturn. 389 */ 390 sf.sf_sc.sc_onstack = oonstack; 391 sf.sf_sc.sc_mask = mask; 392 sf.sf_sc.sc_sp = oldsp; 393 sf.sf_sc.sc_pc = tf->tf_pc; 394 sf.sf_sc.sc_npc = tf->tf_npc; 395 sf.sf_sc.sc_psr = tf->tf_psr; 396 sf.sf_sc.sc_g1 = tf->tf_global[1]; 397 sf.sf_sc.sc_o0 = tf->tf_out[0]; 398 399 /* 400 * Put the stack in a consistent state before we whack away 401 * at it. Note that write_user_windows may just dump the 402 * registers into the pcb; we need them in the process's memory. 403 * We also need to make sure that when we start the signal handler, 404 * its %i6 (%fp), which is loaded from the newly allocated stack area, 405 * joins seamlessly with the frame it was in when the signal occurred, 406 * so that the debugger and _longjmp code can back up through it. 407 */ 408 newsp = (int)fp - sizeof(struct rwindow); 409 write_user_windows(); 410 if (rwindow_save(p) || copyout((caddr_t)&sf, (caddr_t)fp, sizeof sf) || 411 suword(&((struct rwindow *)newsp)->rw_in[6], oldsp)) { 412 /* 413 * Process has trashed its stack; give it an illegal 414 * instruction to halt it in its tracks. 415 */ 416 #ifdef DEBUG 417 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 418 printf("sendsig: window save or copyout error\n"); 419 #endif 420 sigexit(p, SIGILL); 421 /* NOTREACHED */ 422 } 423 #ifdef DEBUG 424 if (sigdebug & SDB_FOLLOW) 425 printf("sendsig: %s[%d] sig %d scp %x\n", 426 p->p_comm, p->p_pid, sig, &fp->sf_sc); 427 #endif 428 /* 429 * Arrange to continue execution at the code copied out in exec(). 430 * It needs the function to call in %g1, and a new stack pointer. 431 */ 432 #ifdef COMPAT_SUNOS 433 if (psp->ps_usertramp & sigmask(sig)) { 434 addr = (int)catcher; /* user does his own trampolining */ 435 } else 436 #endif 437 { 438 addr = USRSTACK - sizeof(struct ps_strings) - szsigcode; 439 tf->tf_global[1] = (int)catcher; 440 } 441 tf->tf_pc = addr; 442 tf->tf_npc = addr + 4; 443 tf->tf_out[6] = newsp; 444 #ifdef DEBUG 445 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 446 printf("sendsig: about to return to catcher\n"); 447 #endif 448 } 449 450 /* 451 * System call to cleanup state after a signal 452 * has been taken. Reset signal mask and 453 * stack state from context left by sendsig (above), 454 * and return to the given trap frame (if there is one). 455 * Check carefully to make sure that the user has not 456 * modified the state to gain improper privileges or to cause 457 * a machine fault. 458 */ 459 /* ARGSUSED */ 460 struct sigreturn_args { 461 struct sigcontext *scp; 462 }; 463 sigreturn(p, uap, retval) 464 register struct proc *p; 465 struct sigreturn_args *uap; 466 int *retval; 467 { 468 register struct sigcontext *scp; 469 register struct trapframe *tf; 470 471 /* First ensure consistent stack state (see sendsig). */ 472 write_user_windows(); 473 if (rwindow_save(p)) 474 sigexit(p, SIGILL); 475 #ifdef DEBUG 476 if (sigdebug & SDB_FOLLOW) 477 printf("sigreturn: %s[%d], scp %x\n", 478 p->p_comm, p->p_pid, uap->scp); 479 #endif 480 scp = uap->scp; 481 if ((int)scp & 3 || useracc((caddr_t)scp, sizeof *scp, B_WRITE) == 0) 482 return (EINVAL); 483 tf = p->p_md.md_tf; 484 /* 485 * Only the icc bits in the psr are used, so it need not be 486 * verified. pc and npc must be multiples of 4. This is all 487 * that is required; if it holds, just do it. 488 */ 489 if (((scp->sc_pc | scp->sc_npc) & 3) != 0) 490 return (EINVAL); 491 /* take only psr ICC field */ 492 tf->tf_psr = (tf->tf_psr & ~PSR_ICC) | (scp->sc_psr & PSR_ICC); 493 tf->tf_pc = scp->sc_pc; 494 tf->tf_npc = scp->sc_npc; 495 tf->tf_global[1] = scp->sc_g1; 496 tf->tf_out[0] = scp->sc_o0; 497 tf->tf_out[6] = scp->sc_sp; 498 if (scp->sc_onstack & 1) 499 p->p_sigacts->ps_sigstk.ss_flags |= SA_ONSTACK; 500 else 501 p->p_sigacts->ps_sigstk.ss_flags &= ~SA_ONSTACK; 502 p->p_sigmask = scp->sc_mask & ~sigcantmask; 503 return (EJUSTRETURN); 504 } 505 506 int waittime = -1; 507 508 boot(howto) 509 register int howto; 510 { 511 int i; 512 static char str[4]; /* room for "-sd\0" */ 513 extern volatile void romhalt(void); 514 extern volatile void romboot(char *); 515 516 fb_unblank(); 517 boothowto = howto; 518 if ((howto & RB_NOSYNC) == 0 && waittime < 0) { 519 register struct buf *bp; 520 int iter, nbusy; 521 #if 1 522 extern struct proc proc0; 523 524 /* protect against curproc->p_stats.foo refs in sync() XXX */ 525 if (curproc == NULL) 526 curproc = &proc0; 527 #endif 528 waittime = 0; 529 (void) spl0(); 530 printf("syncing disks... "); 531 /* 532 * Release vnodes held by texts before sync. 533 */ 534 if (panicstr == 0) 535 vnode_pager_umount((struct mount *)NULL); 536 sync(&proc0, (void *)NULL, (int *)NULL); 537 538 for (iter = 0; iter < 20; iter++) { 539 nbusy = 0; 540 for (bp = &buf[nbuf]; --bp >= buf; ) 541 if ((bp->b_flags & (B_BUSY|B_INVAL)) == B_BUSY) 542 nbusy++; 543 if (nbusy == 0) 544 break; 545 printf("%d ", nbusy); 546 DELAY(40000 * iter); 547 } 548 if (nbusy) 549 printf("giving up\n"); 550 else 551 printf("done\n"); 552 /* 553 * If we've been adjusting the clock, the todr 554 * will be out of synch; adjust it now. 555 */ 556 resettodr(); 557 } 558 (void) splhigh(); /* ??? */ 559 if (howto & RB_HALT) { 560 printf("halted\n\n"); 561 romhalt(); 562 } 563 if (howto & RB_DUMP) 564 dumpsys(); 565 printf("rebooting\n\n"); 566 i = 1; 567 if (howto & RB_SINGLE) 568 str[i++] = 's'; 569 if (howto & RB_KDB) 570 str[i++] = 'd'; 571 if (i > 1) { 572 str[0] = '-'; 573 str[i] = 0; 574 } else 575 str[0] = 0; 576 romboot(str); 577 /*NOTREACHED*/ 578 } 579 580 int dumpmag = 0x8fca0101; /* magic number for savecore */ 581 int dumpsize = 0; /* also for savecore */ 582 long dumplo = 0; 583 584 dumpconf() 585 { 586 int nblks; 587 588 dumpsize = physmem; 589 #define DUMPMMU 590 #ifdef DUMPMMU 591 #define NPMEG 128 592 /* 593 * savecore views the image in units of pages (i.e., dumpsize is in 594 * pages) so we round the two mmu entities into page-sized chunks. 595 * The PMEGs (32kB) and the segment table (512 bytes plus padding) 596 * are appending to the end of the crash dump. 597 */ 598 dumpsize += btoc(sizeof(((struct kpmap *)0)->pm_rsegmap)) + 599 btoc(NPMEG * NPTESG * sizeof(int)); 600 #endif 601 if (dumpdev != NODEV && bdevsw[major(dumpdev)].d_psize) { 602 nblks = (*bdevsw[major(dumpdev)].d_psize)(dumpdev); 603 /* 604 * Don't dump on the first CLBYTES (why CLBYTES?) 605 * in case the dump device includes a disk label. 606 */ 607 if (dumplo < btodb(CLBYTES)) 608 dumplo = btodb(CLBYTES); 609 610 /* 611 * If dumpsize is too big for the partition, truncate it. 612 * Otherwise, put the dump at the end of the partition 613 * by making dumplo as large as possible. 614 */ 615 if (dumpsize > btoc(dbtob(nblks - dumplo))) 616 dumpsize = btoc(dbtob(nblks - dumplo)); 617 else if (dumplo + ctod(dumpsize) > nblks) 618 dumplo = nblks - ctod(dumpsize); 619 } 620 } 621 622 #ifdef DUMPMMU 623 /* XXX */ 624 #include <machine/ctlreg.h> 625 #define getpte(va) lda(va, ASI_PTE) 626 #define setsegmap(va, pmeg) stba(va, ASI_SEGMAP, pmeg) 627 628 /* 629 * Write the mmu contents to the dump device. 630 * This gets appended to the end of a crash dump since 631 * there is no in-core copy of kernel memory mappings. 632 */ 633 int 634 dumpmmu(blkno) 635 register daddr_t blkno; 636 { 637 register int (*dump)(/*dev_t, daddr_t, caddr_t, int*/); 638 register int pmeg; 639 register int addr; /* unused kernel virtual address */ 640 register int i; 641 register int *pte, *ptend; 642 register int error; 643 register struct kpmap *kpmap = &kernel_pmap_store; 644 int buffer[dbtob(1) / sizeof(int)]; 645 extern int seginval; /* from pmap.c */ 646 647 648 dump = bdevsw[major(dumpdev)].d_dump; 649 650 /* 651 * dump page table entries 652 * 653 * We dump each pmeg in order (by segment number). Since the MMU 654 * automatically maps the given virtual segment to a pmeg we must 655 * iterate over the segments by incrementing an unused segment slot 656 * in the MMU. This fixed segment number is used in the virtual 657 * address argument to getpte(). 658 */ 659 660 /* First find an unused virtual segment. */ 661 i = NKSEG; 662 while (kpmap->pm_rsegmap[--i] != seginval) 663 if (i <= 0) 664 return (-1); 665 /* 666 * Compute the base address corresponding to the unused segment. 667 * Note that the kernel segments start after all the user segments 668 * so we must account for this offset. 669 */ 670 addr = VSTOVA(i + NUSEG); 671 /* 672 * Go through the pmegs and dump each one. 673 */ 674 pte = buffer; 675 ptend = &buffer[sizeof(buffer) / sizeof(buffer[0])]; 676 for (pmeg = 0; pmeg < NPMEG; ++pmeg) { 677 register int va = addr; 678 679 setsegmap(addr, pmeg); 680 i = NPTESG; 681 do { 682 *pte++ = getpte(va); 683 if (pte >= ptend) { 684 /* 685 * Note that we'll dump the last block 686 * the last time through the loops because 687 * all the PMEGs occupy 32KB which is 688 * a multiple of the block size. 689 */ 690 error = (*dump)(dumpdev, blkno, 691 (caddr_t)buffer, 692 dbtob(1)); 693 if (error != 0) 694 return (error); 695 ++blkno; 696 pte = buffer; 697 } 698 va += NBPG; 699 } while (--i > 0); 700 } 701 setsegmap(addr, seginval); 702 703 /* 704 * dump (512 byte) segment map 705 * XXX assume it's a multiple of the block size 706 */ 707 error = (*dump)(dumpdev, blkno, (caddr_t)kpmap->pm_rsegmap, 708 sizeof(kpmap->pm_rsegmap)); 709 return (error); 710 } 711 #endif 712 713 #define BYTES_PER_DUMP (32 * 1024) /* must be a multiple of pagesize */ 714 static vm_offset_t dumpspace; 715 716 caddr_t 717 reserve_dumppages(p) 718 caddr_t p; 719 { 720 721 dumpspace = (vm_offset_t)p; 722 return (p + BYTES_PER_DUMP); 723 } 724 725 /* 726 * Write a crash dump. 727 */ 728 dumpsys() 729 { 730 register unsigned bytes, i, n; 731 register int maddr, psize; 732 register daddr_t blkno; 733 register int (*dump)(/*dev_t, daddr_t, caddr_t, int, int*/); 734 int error = 0; 735 736 if (dumpdev == NODEV) 737 return; 738 /* copy registers to memory */ 739 snapshot(cpcb); 740 /* 741 * For dumps during autoconfiguration, 742 * if dump device has already configured... 743 */ 744 if (dumpsize == 0) 745 dumpconf(); 746 if (dumplo < 0) 747 return; 748 printf("\ndumping to dev %x, offset %d\n", dumpdev, dumplo); 749 750 psize = (*bdevsw[major(dumpdev)].d_psize)(dumpdev); 751 printf("dump "); 752 if (psize == -1) { 753 printf("area unavailable\n"); 754 return; 755 } 756 bytes = physmem << PGSHIFT; 757 maddr = 0; 758 blkno = dumplo; 759 dump = bdevsw[major(dumpdev)].d_dump; 760 for (i = 0; i < bytes; i += n) { 761 n = bytes - i; 762 if (n > BYTES_PER_DUMP) 763 n = BYTES_PER_DUMP; 764 #ifdef DEBUG 765 /* print out how many MBs we have dumped */ 766 if (i && (i % (1024*1024)) == 0) 767 printf("%d ", i / (1024*1024)); 768 #endif 769 (void) pmap_map(dumpspace, maddr, maddr + n, VM_PROT_READ); 770 error = (*dump)(dumpdev, blkno, (caddr_t)dumpspace, (int)n); 771 if (error) 772 break; 773 maddr += n; 774 blkno += btodb(n); 775 } 776 #ifdef DUMPMMU 777 if (!error) 778 error = dumpmmu(blkno); 779 #endif 780 switch (error) { 781 782 case ENXIO: 783 printf("device bad\n"); 784 break; 785 786 case EFAULT: 787 printf("device not ready\n"); 788 break; 789 790 case EINVAL: 791 printf("area improper\n"); 792 break; 793 794 case EIO: 795 printf("i/o error\n"); 796 break; 797 798 case 0: 799 printf("succeeded\n"); 800 break; 801 802 default: 803 printf("error %d\n", error); 804 break; 805 } 806 } 807 808 /* 809 * Map an I/O device given physical address and size in bytes, e.g., 810 * 811 * mydev = (struct mydev *)mapdev(myioaddr, 0, sizeof(struct mydev)); 812 * 813 * See also machine/autoconf.h. 814 */ 815 void * 816 mapdev(phys, virt, size) 817 register void *phys; 818 register int virt, size; 819 { 820 register vm_offset_t v; 821 register void *ret; 822 static vm_offset_t iobase = IODEV_BASE; 823 824 size = round_page(size); 825 if (virt) 826 v = trunc_page(virt); 827 else { 828 v = iobase; 829 iobase += size; 830 if (iobase > IODEV_END) /* unlikely */ 831 panic("mapiodev"); 832 } 833 ret = (void *)v; 834 phys = (void *)trunc_page(phys); 835 do { 836 pmap_enter(kernel_pmap, v, 837 (vm_offset_t)phys | PMAP_OBIO | PMAP_NC, 838 VM_PROT_READ | VM_PROT_WRITE, 1); 839 v += PAGE_SIZE; 840 phys += PAGE_SIZE; 841 } while ((size -= PAGE_SIZE) > 0); 842 return (ret); 843 } 844