machdep.c revision 1.44
1 /* $NetBSD: machdep.c,v 1.44 2005/12/24 22:45:35 perry Exp $ */ 2 3 /*- 4 * Copyright (c) 2000 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Tohru Nishimura. 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 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 40 41 __KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.44 2005/12/24 22:45:35 perry Exp $"); 42 43 #include "opt_ddb.h" 44 #include "opt_kgdb.h" 45 #include "opt_compat_sunos.h" 46 #include "opt_panicbutton.h" 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/kernel.h> 51 #include <sys/proc.h> 52 #include <sys/buf.h> 53 #include <sys/reboot.h> 54 #include <sys/conf.h> 55 #include <sys/file.h> 56 #include <sys/device.h> 57 #include <sys/malloc.h> 58 #include <sys/mbuf.h> 59 #include <sys/msgbuf.h> 60 #include <sys/ioctl.h> 61 #include <sys/tty.h> 62 #include <sys/mount.h> 63 #include <sys/user.h> 64 #include <sys/exec.h> 65 #include <sys/core.h> 66 #include <sys/kcore.h> 67 #include <sys/vnode.h> 68 #include <sys/sa.h> 69 #include <sys/syscallargs.h> 70 #include <sys/ksyms.h> 71 #ifdef KGDB 72 #include <sys/kgdb.h> 73 #endif 74 #include <sys/boot_flag.h> 75 76 #include <uvm/uvm_extern.h> 77 78 #include <sys/sysctl.h> 79 80 #include <machine/cpu.h> 81 #include <machine/reg.h> 82 #include <machine/psl.h> 83 #include <machine/pte.h> 84 #include <machine/kcore.h> /* XXX should be pulled in by sys/kcore.h */ 85 86 #include <dev/cons.h> 87 88 #if defined(DDB) 89 #include <machine/db_machdep.h> 90 #include <ddb/db_sym.h> 91 #include <ddb/db_extern.h> 92 #endif 93 94 #include "ksyms.h" 95 96 /* 97 * Info for CTL_HW 98 */ 99 char machine[] = MACHINE; 100 char cpu_model[60]; 101 102 /* Our exported CPU info; we can have only one. */ 103 struct cpu_info cpu_info_store; 104 105 struct vm_map *exec_map = NULL; 106 struct vm_map *mb_map = NULL; 107 struct vm_map *phys_map = NULL; 108 109 caddr_t msgbufaddr; 110 int maxmem; /* max memory per process */ 111 int physmem; /* set by locore */ 112 /* 113 * safepri is a safe priority for sleep to set for a spin-wait 114 * during autoconfiguration or after a panic. 115 */ 116 int safepri = PSL_LOWIPL; 117 118 void luna68k_init __P((void)); 119 void identifycpu __P((void)); 120 void dumpsys __P((void)); 121 122 void straytrap __P((int, u_short)); 123 void nmihand __P((struct frame)); 124 125 int cpu_dumpsize __P((void)); 126 int cpu_dump __P((int (*)(dev_t, daddr_t, caddr_t, size_t), daddr_t *)); 127 void cpu_init_kcore_hdr __P((void)); 128 129 /* 130 * Machine-independent crash dump header info. 131 */ 132 cpu_kcore_hdr_t cpu_kcore_hdr; 133 134 int machtype; /* model: 1 for LUNA-1, 2 for LUNA-2 */ 135 int sysconsole; /* console: 0 for ttya, 1 for video */ 136 137 extern struct consdev syscons; 138 extern void omfb_cnattach __P((void)); 139 extern void ws_cnattach __P((void)); 140 extern void syscnattach __P((int)); 141 142 /* 143 * On the 68020/68030, the value of delay_divisor is roughly 144 * 2048 / cpuspeed (where cpuspeed is in MHz). 145 * 146 * On the 68040/68060(?), the value of delay_divisor is roughly 147 * 759 / cpuspeed (where cpuspeed is in MHz). 148 * XXX -- is the above formula correct? 149 */ 150 int cpuspeed = 25; /* only used for printing later */ 151 int delay_divisor = 300; /* for delay() loop count */ 152 153 /* 154 * Early initialization, before main() is called. 155 */ 156 void 157 luna68k_init() 158 { 159 volatile unsigned char *pio0 = (void *)0x49000000; 160 int sw1, i; 161 char *cp; 162 extern char bootarg[64]; 163 164 extern paddr_t avail_start, avail_end; 165 166 /* 167 * Tell the VM system about available physical memory. The 168 * luna68k only has one segment. 169 */ 170 uvm_page_physload(atop(avail_start), atop(avail_end), 171 atop(avail_start), atop(avail_end), VM_FREELIST_DEFAULT); 172 173 /* 174 * Initialize error message buffer (at end of core). 175 * avail_end was pre-decremented in pmap_bootstrap to compensate. 176 */ 177 for (i = 0; i < btoc(MSGBUFSIZE); i++) 178 pmap_enter(pmap_kernel(), (vaddr_t)msgbufaddr + i * PAGE_SIZE, 179 avail_end + i * PAGE_SIZE, VM_PROT_READ|VM_PROT_WRITE, 180 VM_PROT_READ|VM_PROT_WRITE|PMAP_WIRED); 181 pmap_update(pmap_kernel()); 182 initmsgbuf(msgbufaddr, m68k_round_page(MSGBUFSIZE)); 183 184 185 pio0[3] = 0xb6; 186 pio0[2] = 1 << 6; /* enable parity check */ 187 pio0[3] = 0xb6; 188 sw1 = pio0[0]; /* dipssw1 value */ 189 sw1 ^= 0xff; 190 sysconsole = !(sw1 & 0x2); /* console selection */ 191 192 boothowto = 0; 193 i = 0; 194 /* 195 * 'bootarg' has; 196 * "<args of x command> ENADDR=<addr> HOST=<host> SERVER=<name>" 197 * where <addr> is MAC address of which network loader used (not 198 * necessarily same as one at 0x4101.FFE0), <host> and <name> 199 * are the values of HOST and SERVER environment variables, 200 * 201 * NetBSD/luna68k cares only the first argment; any of "sda". 202 */ 203 for (cp = bootarg; *cp != ' '; cp++) { 204 BOOT_FLAG(*cp, boothowto); 205 if (i++ >= sizeof(bootarg)) 206 break; 207 } 208 #if 0 /* overload 1:sw1, which now means 'go ROM monitor' after poweron */ 209 if (boothowto == 0) 210 boothowto = (sw1 & 0x1) ? RB_SINGLE : 0; 211 #endif 212 } 213 214 /* 215 * Console initialization: called early on from main, 216 */ 217 void 218 consinit() 219 { 220 if (sysconsole == 0) 221 syscnattach(0); 222 else { 223 omfb_cnattach(); 224 ws_cnattach(); 225 } 226 227 #if NKSYMS || defined(DDB) || defined(LKM) 228 { 229 extern int end; 230 extern int *esym; 231 232 ksyms_init(*(int *)&end, ((int *)&end) + 1, esym); 233 } 234 #endif 235 #ifdef DDB 236 if (boothowto & RB_KDB) 237 cpu_Debugger(); 238 #endif 239 } 240 241 /* 242 * cpu_startup: allocate memory for variable-sized tables. 243 */ 244 void 245 cpu_startup() 246 { 247 vaddr_t minaddr, maxaddr; 248 char pbuf[9]; 249 extern void greeting __P((void)); 250 251 if (fputype != FPU_NONE) 252 m68k_make_fpu_idle_frame(); 253 254 /* 255 * Initialize the kernel crash dump header. 256 */ 257 cpu_init_kcore_hdr(); 258 259 /* 260 * Good {morning,afternoon,evening,night}. 261 */ 262 printf("%s%s", copyright, version); 263 identifycpu(); 264 265 format_bytes(pbuf, sizeof(pbuf), ctob(physmem)); 266 printf("total memory = %s\n", pbuf); 267 268 minaddr = 0; 269 /* 270 * Allocate a submap for exec arguments. This map effectively 271 * limits the number of processes exec'ing at any time. 272 */ 273 exec_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr, 274 16*NCARGS, VM_MAP_PAGEABLE, FALSE, NULL); 275 276 /* 277 * Allocate a submap for physio 278 */ 279 phys_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr, 280 VM_PHYS_SIZE, 0, FALSE, NULL); 281 282 /* 283 * Finally, allocate mbuf cluster submap. 284 */ 285 mb_map = uvm_km_suballoc(kernel_map, &minaddr, &maxaddr, 286 nmbclusters * mclbytes, VM_MAP_INTRSAFE, 287 FALSE, NULL); 288 289 format_bytes(pbuf, sizeof(pbuf), ptoa(uvmexp.free)); 290 printf("avail memory = %s\n", pbuf); 291 292 /* 293 * Say "Hi" to the world 294 */ 295 greeting(); 296 } 297 298 /* 299 * Set registers on exec. 300 */ 301 void 302 setregs(l, pack, stack) 303 struct lwp *l; 304 struct exec_package *pack; 305 u_long stack; 306 { 307 struct frame *frame = (struct frame *)l->l_md.md_regs; 308 extern int fputype; 309 310 frame->f_sr = PSL_USERSET; 311 frame->f_pc = pack->ep_entry & ~1; 312 frame->f_regs[D0] = 0; 313 frame->f_regs[D1] = 0; 314 frame->f_regs[D2] = 0; 315 frame->f_regs[D3] = 0; 316 frame->f_regs[D4] = 0; 317 frame->f_regs[D5] = 0; 318 frame->f_regs[D6] = 0; 319 frame->f_regs[D7] = 0; 320 frame->f_regs[A0] = 0; 321 frame->f_regs[A1] = 0; 322 frame->f_regs[A2] = (int)l->l_proc->p_psstr; 323 frame->f_regs[A3] = 0; 324 frame->f_regs[A4] = 0; 325 frame->f_regs[A5] = 0; 326 frame->f_regs[A6] = 0; 327 frame->f_regs[SP] = stack; 328 329 /* restore a null state frame */ 330 l->l_addr->u_pcb.pcb_fpregs.fpf_null = 0; 331 if (fputype) 332 m68881_restore(&l->l_addr->u_pcb.pcb_fpregs); 333 } 334 335 void 336 identifycpu() 337 { 338 extern int cputype; 339 const char *cpu; 340 341 bzero(cpu_model, sizeof(cpu_model)); 342 switch (cputype) { 343 case CPU_68030: 344 cpu = "MC68030 CPU+MMU, MC68882 FPU"; 345 machtype = LUNA_I; 346 cpuspeed = 20; delay_divisor = 102; /* 20MHz 68030 */ 347 hz = 60; 348 break; 349 #if defined(M68040) 350 case CPU_68040: 351 cpu = "MC68040 CPU+MMU+FPU, 4k on-chip physical I/D caches"; 352 machtype = LUNA_II; 353 cpuspeed = 25; delay_divisor = 300; /* 25MHz 68040 */ 354 break; 355 #endif 356 default: 357 panic("unknown CPU type"); 358 } 359 strcpy(cpu_model, cpu); 360 printf("%s\n", cpu_model); 361 } 362 363 /* 364 * machine dependent system variables. 365 */ 366 SYSCTL_SETUP(sysctl_machdep_setup, "sysctl machdep subtree setup") 367 { 368 369 sysctl_createv(clog, 0, NULL, NULL, 370 CTLFLAG_PERMANENT, 371 CTLTYPE_NODE, "machdep", NULL, 372 NULL, 0, NULL, 0, 373 CTL_MACHDEP, CTL_EOL); 374 375 sysctl_createv(clog, 0, NULL, NULL, 376 CTLFLAG_PERMANENT, 377 CTLTYPE_STRUCT, "console_device", NULL, 378 sysctl_consdev, 0, NULL, sizeof(dev_t), 379 CTL_MACHDEP, CPU_CONSDEV, CTL_EOL); 380 } 381 382 int waittime = -1; 383 384 void 385 cpu_reboot(howto, bootstr) 386 volatile int howto; /* XXX to shutup GCC XXX */ 387 char *bootstr; 388 { 389 extern void doboot __P((void)); 390 391 /* take a snap shot before clobbering any registers */ 392 if (curlwp && curlwp->l_addr) 393 savectx(&curlwp->l_addr->u_pcb); 394 395 /* If system is hold, just halt. */ 396 if (cold) { 397 howto |= RB_HALT; 398 goto haltsys; 399 } 400 401 boothowto = howto; 402 if ((howto & RB_NOSYNC) == 0 && waittime < 0) { 403 waittime = 0; 404 vfs_shutdown(); 405 /* 406 * If we've been adjusting the clock, the todr 407 * will be out of synch; adjust it now. 408 */ 409 resettodr(); 410 } 411 412 /* Disable interrupts. */ 413 splhigh(); 414 415 /* If rebooting and a dump is requested, do it. */ 416 if (howto & RB_DUMP) 417 dumpsys(); 418 419 haltsys: 420 /* Run any shutdown hooks. */ 421 doshutdownhooks(); 422 423 /* Finally, halt/reboot the system. */ 424 if ((howto & RB_POWERDOWN) == RB_POWERDOWN) { 425 u_int8_t *pio = (void *)0x4d000000; 426 427 printf("power is going down.\n"); 428 DELAY(100000); 429 pio[3] = 0x94; 430 pio[2] = 0 << 4; 431 for (;;) /* NOP */; 432 } 433 if (howto & RB_HALT) { 434 printf("System halted. Hit any key to reboot.\n\n"); 435 (void)cngetc(); 436 } 437 438 printf("rebooting...\n"); 439 DELAY(100000); 440 doboot(); 441 /*NOTREACHED*/ 442 while (1) ; 443 } 444 445 /* 446 * Initialize the kernel crash dump header. 447 */ 448 void 449 cpu_init_kcore_hdr() 450 { 451 cpu_kcore_hdr_t *h = &cpu_kcore_hdr; 452 struct m68k_kcore_hdr *m = &h->un._m68k; 453 extern char end[]; 454 455 bzero(&cpu_kcore_hdr, sizeof(cpu_kcore_hdr)); 456 457 /* 458 * Initialize the `dispatcher' portion of the header. 459 */ 460 strcpy(h->name, machine); 461 h->page_size = PAGE_SIZE; 462 h->kernbase = KERNBASE; 463 464 /* 465 * Fill in information about our MMU configuration. 466 */ 467 m->mmutype = mmutype; 468 m->sg_v = SG_V; 469 m->sg_frame = SG_FRAME; 470 m->sg_ishift = SG_ISHIFT; 471 m->sg_pmask = SG_PMASK; 472 m->sg40_shift1 = SG4_SHIFT1; 473 m->sg40_mask2 = SG4_MASK2; 474 m->sg40_shift2 = SG4_SHIFT2; 475 m->sg40_mask3 = SG4_MASK3; 476 m->sg40_shift3 = SG4_SHIFT3; 477 m->sg40_addr1 = SG4_ADDR1; 478 m->sg40_addr2 = SG4_ADDR2; 479 m->pg_v = PG_V; 480 m->pg_frame = PG_FRAME; 481 482 /* 483 * Initialize pointer to kernel segment table. 484 */ 485 m->sysseg_pa = (u_int32_t)(pmap_kernel()->pm_stpa); 486 487 /* 488 * Initialize relocation value such that: 489 * 490 * pa = (va - KERNBASE) + reloc 491 * 492 * Since we're linked and loaded at the same place, 493 * and the kernel is mapped va == pa, this is 0. 494 */ 495 m->reloc = 0; 496 497 /* 498 * Define the end of the relocatable range. 499 */ 500 m->relocend = (u_int32_t)end; 501 502 /* 503 * The luna68k has one contiguous memory segment. 504 */ 505 m->ram_segs[0].start = 0 /* lowram */; 506 m->ram_segs[0].size = ctob(physmem); 507 } 508 509 /* 510 * Compute the size of the machine-dependent crash dump header. 511 * Returns size in disk blocks. 512 */ 513 514 #define CHDRSIZE (ALIGN(sizeof(kcore_seg_t)) + ALIGN(sizeof(cpu_kcore_hdr_t))) 515 #define MDHDRSIZE roundup(CHDRSIZE, dbtob(1)) 516 517 int 518 cpu_dumpsize() 519 { 520 521 return btodb(MDHDRSIZE); 522 } 523 524 /* 525 * Called by dumpsys() to dump the machine-dependent header. 526 */ 527 int 528 cpu_dump(dump, blknop) 529 int (*dump) __P((dev_t, daddr_t, caddr_t, size_t)); 530 daddr_t *blknop; 531 { 532 int buf[MDHDRSIZE / sizeof(int)]; 533 cpu_kcore_hdr_t *chdr; 534 kcore_seg_t *kseg; 535 int error; 536 537 kseg = (kcore_seg_t *)buf; 538 chdr = (cpu_kcore_hdr_t *)&buf[ALIGN(sizeof(kcore_seg_t)) / 539 sizeof(int)]; 540 541 /* Create the segment header. */ 542 CORE_SETMAGIC(*kseg, KCORE_MAGIC, MID_MACHINE, CORE_CPU); 543 kseg->c_size = MDHDRSIZE - ALIGN(sizeof(kcore_seg_t)); 544 545 bcopy(&cpu_kcore_hdr, chdr, sizeof(cpu_kcore_hdr_t)); 546 error = (*dump)(dumpdev, *blknop, (caddr_t)buf, sizeof(buf)); 547 *blknop += btodb(sizeof(buf)); 548 return (error); 549 } 550 551 /* 552 * These variables are needed by /sbin/savecore 553 */ 554 u_int32_t dumpmag = 0x8fca0101; /* magic number */ 555 int dumpsize = 0; /* pages */ 556 long dumplo = 0; /* blocks */ 557 558 /* 559 * This is called by main to set dumplo and dumpsize. 560 * Dumps always skip the first PAGE_SIZE of disk space 561 * in case there might be a disk label stored there. 562 * If there is extra space, put dump at the end to 563 * reduce the chance that swapping trashes it. 564 */ 565 void 566 cpu_dumpconf() 567 { 568 const struct bdevsw *bdev; 569 int chdrsize; /* size of dump header */ 570 int nblks; /* size of dump area */ 571 572 if (dumpdev == NODEV) 573 return; 574 bdev = bdevsw_lookup(dumpdev); 575 if (bdev == NULL) 576 panic("dumpconf: bad dumpdev=0x%x", dumpdev); 577 if (bdev->d_psize == NULL) 578 return; 579 nblks = (*bdev->d_psize)(dumpdev); 580 chdrsize = cpu_dumpsize(); 581 582 dumpsize = btoc(cpu_kcore_hdr.un._m68k.ram_segs[0].size); 583 584 /* 585 * Check do see if we will fit. Note we always skip the 586 * first PAGE_SIZE in case there is a disk label there. 587 */ 588 if (nblks < (ctod(dumpsize) + chdrsize + ctod(1))) { 589 dumpsize = 0; 590 dumplo = -1; 591 return; 592 } 593 594 /* 595 * Put dump at the end of the partition. 596 */ 597 dumplo = (nblks - 1) - ctod(dumpsize) - chdrsize; 598 } 599 600 /* 601 * Dump physical memory onto the dump device. Called by cpu_reboot(). 602 */ 603 void 604 dumpsys() 605 { 606 const struct bdevsw *bdev; 607 daddr_t blkno; /* current block to write */ 608 /* dump routine */ 609 int (*dump) __P((dev_t, daddr_t, caddr_t, size_t)); 610 int pg; /* page being dumped */ 611 paddr_t maddr; /* PA being dumped */ 612 int error; /* error code from (*dump)() */ 613 614 /* XXX initialized here because of gcc lossage */ 615 maddr = 0 /* lowram */; 616 pg = 0; 617 618 /* Make sure dump device is valid. */ 619 if (dumpdev == NODEV) 620 return; 621 bdev = bdevsw_lookup(dumpdev); 622 if (bdev == NULL) 623 return; 624 if (dumpsize == 0) { 625 cpu_dumpconf(); 626 if (dumpsize == 0) 627 return; 628 } 629 if (dumplo <= 0) { 630 printf("\ndump to dev %u,%u not possible\n", major(dumpdev), 631 minor(dumpdev)); 632 return; 633 } 634 dump = bdev->d_dump; 635 blkno = dumplo; 636 637 printf("\ndumping to dev %u,%u offset %ld\n", major(dumpdev), 638 minor(dumpdev), dumplo); 639 640 printf("dump "); 641 642 /* Write the dump header. */ 643 error = cpu_dump(dump, &blkno); 644 if (error) 645 goto bad; 646 647 for (pg = 0; pg < dumpsize; pg++) { 648 #define NPGMB (1024*1024/PAGE_SIZE) 649 /* print out how many MBs we have dumped */ 650 if (pg && (pg % NPGMB) == 0) 651 printf("%d ", pg / NPGMB); 652 #undef NPGMB 653 pmap_enter(pmap_kernel(), (vaddr_t)vmmap, maddr, 654 VM_PROT_READ, VM_PROT_READ|PMAP_WIRED); 655 656 pmap_update(pmap_kernel()); 657 error = (*dump)(dumpdev, blkno, vmmap, PAGE_SIZE); 658 bad: 659 switch (error) { 660 case 0: 661 maddr += PAGE_SIZE; 662 blkno += btodb(PAGE_SIZE); 663 break; 664 665 case ENXIO: 666 printf("device bad\n"); 667 return; 668 669 case EFAULT: 670 printf("device not ready\n"); 671 return; 672 673 case EINVAL: 674 printf("area improper\n"); 675 return; 676 677 case EIO: 678 printf("i/o error\n"); 679 return; 680 681 case EINTR: 682 printf("aborted from console\n"); 683 return; 684 685 default: 686 printf("error %d\n", error); 687 return; 688 } 689 } 690 printf("succeeded\n"); 691 } 692 693 void 694 straytrap(pc, evec) 695 int pc; 696 u_short evec; 697 { 698 printf("unexpected trap (vector offset %x) from %x\n", 699 evec & 0xFFF, pc); 700 } 701 702 int *nofault; 703 704 int 705 badaddr(addr, nbytes) 706 register caddr_t addr; 707 int nbytes; 708 { 709 register int i; 710 label_t faultbuf; 711 712 #ifdef lint 713 i = *addr; if (i) return (0); 714 #endif 715 716 nofault = (int *) &faultbuf; 717 if (setjmp((label_t *)nofault)) { 718 nofault = (int *) 0; 719 return(1); 720 } 721 722 switch (nbytes) { 723 case 1: 724 i = *(volatile char *)addr; 725 break; 726 727 case 2: 728 i = *(volatile short *)addr; 729 break; 730 731 case 4: 732 i = *(volatile int *)addr; 733 break; 734 735 default: 736 panic("badaddr: bad request"); 737 } 738 nofault = (int *) 0; 739 return (0); 740 } 741 742 void luna68k_abort __P((const char *)); 743 744 static int innmihand; /* simple mutex */ 745 746 /* 747 * Level 7 interrupts are caused by e.g. the ABORT switch. 748 * 749 * If we have DDB, then break into DDB on ABORT. In a production 750 * environment, bumping the ABORT switch would be bad, so we enable 751 * panic'ing on ABORT with the kernel option "PANICBUTTON". 752 */ 753 void 754 nmihand(frame) 755 struct frame frame; 756 { 757 /* Prevent unwanted recursion */ 758 if (innmihand) 759 return; 760 innmihand = 1; 761 762 luna68k_abort("ABORT SWITCH"); 763 } 764 765 /* 766 * Common code for handling ABORT signals from buttons, switches, 767 * serial lines, etc. 768 */ 769 void 770 luna68k_abort(cp) 771 const char *cp; 772 { 773 #ifdef DDB 774 printf("%s\n", cp); 775 cpu_Debugger(); 776 #else 777 #ifdef PANICBUTTON 778 panic(cp); 779 #else 780 printf("%s ignored\n", cp); 781 #endif /* PANICBUTTON */ 782 #endif /* DDB */ 783 } 784 785 /* 786 * cpu_exec_aout_makecmds(): 787 * CPU-dependent a.out format hook for execve(). 788 * 789 * Determine of the given exec package refers to something which we 790 * understand and, if so, set up the vmcmds for it. 791 */ 792 int 793 cpu_exec_aout_makecmds(l, epp) 794 struct lwp *l; 795 struct exec_package *epp; 796 { 797 int error = ENOEXEC; 798 #ifdef COMPAT_SUNOS 799 extern sunos_exec_aout_makecmds 800 __P((struct proc *, struct exec_package *)); 801 if ((error = sunos_exec_aout_makecmds(l->l_proc, epp)) == 0) 802 return 0; 803 #endif 804 return error; 805 } 806 807 /* 808 * Return the best possible estimate of the time in the timeval 809 * to which tvp points. Unfortunately, we can't read the hardware registers. 810 * We guarantee that the time will be greater than the value obtained by a 811 * previous call. 812 */ 813 void 814 microtime(tvp) 815 register struct timeval *tvp; 816 { 817 int s = splclock(); 818 static struct timeval lasttime; 819 820 *tvp = time; 821 #ifdef notdef 822 tvp->tv_usec += clkread(); 823 while (tvp->tv_usec >= 1000000) { 824 tvp->tv_sec++; 825 tvp->tv_usec -= 1000000; 826 } 827 #endif 828 if (tvp->tv_sec == lasttime.tv_sec && 829 tvp->tv_usec <= lasttime.tv_usec && 830 (tvp->tv_usec = lasttime.tv_usec + 1) >= 1000000) { 831 tvp->tv_sec++; 832 tvp->tv_usec -= 1000000; 833 } 834 lasttime = *tvp; 835 splx(s); 836 } 837 838 #if 1 839 840 struct consdev *cn_tab = &syscons; 841 842 #else 843 844 /* 845 * romcons is useful until m68k TC register is initialized. 846 */ 847 int romcngetc __P((dev_t)); 848 void romcnputc __P((dev_t, int)); 849 850 struct consdev romcons = { 851 NULL, 852 NULL, 853 romcngetc, 854 romcnputc, 855 nullcnpollc, 856 makedev(7, 0), /* XXX */ 857 CN_DEAD, 858 }; 859 struct consdev *cn_tab = &romcons; 860 861 #define __ ((int **)0x41000000) 862 #define GETC() (*(int (*)())__[6])() 863 #define PUTC(x) (*(void (*)())__[7])(x) 864 865 #define ROMPUTC(x) \ 866 ({ \ 867 register _r; \ 868 __asm volatile (" \ 869 movc %%vbr,%0 ; \ 870 movel %0,%%sp@- ; \ 871 clrl %0 ; \ 872 movc %0,%%vbr" \ 873 : "=r" (_r)); \ 874 PUTC(x); \ 875 __asm volatile (" \ 876 movel %%sp@+,%0 ; \ 877 movc %0,%%vbr" \ 878 : "=r" (_r)); \ 879 }) 880 881 #define ROMGETC() \ 882 ({ \ 883 register _r, _c; \ 884 __asm volatile (" \ 885 movc %%vbr,%0 ; \ 886 movel %0,%%sp@- ; \ 887 clrl %0 ; \ 888 movc %0,%%vbr" \ 889 : "=r" (_r)); \ 890 _c = GETC(); \ 891 __asm volatile (" \ 892 movel %%sp@+,%0 ; \ 893 movc %0,%%vbr" \ 894 : "=r" (_r)); \ 895 _c; \ 896 }) 897 898 void 899 romcnputc(dev, c) 900 dev_t dev; 901 int c; 902 { 903 int s; 904 905 s = splhigh(); 906 ROMPUTC(c); 907 splx(s); 908 } 909 910 int 911 romcngetc(dev) 912 dev_t dev; 913 { 914 int s, c; 915 916 do { 917 s = splhigh(); 918 c = ROMGETC(); 919 splx(s); 920 } while (c == -1); 921 return c; 922 } 923 #endif 924
Indexes created Tue Sep 30 17:09:57 GMT 2025