machdep.c revision 14331
1/*- 2 * Copyright (c) 1992 Terrence R. Lambert. 3 * Copyright (c) 1982, 1987, 1990 The Regents of the University of California. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * William Jolitz. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. 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 * from: @(#)machdep.c 7.4 (Berkeley) 6/3/91 38 * $Id: machdep.c,v 1.175 1996/03/02 18:24:00 peter Exp $ 39 */ 40 41#include "npx.h" 42#include "isa.h" 43#include "opt_sysvipc.h" 44#include "opt_ddb.h" 45#include "opt_bounce.h" 46#include "opt_machdep.h" 47 48#include <sys/param.h> 49#include <sys/systm.h> 50#include <sys/sysproto.h> 51#include <sys/signalvar.h> 52#include <sys/kernel.h> 53#include <sys/proc.h> 54#include <sys/buf.h> 55#include <sys/reboot.h> 56#include <sys/conf.h> 57#include <sys/file.h> 58#include <sys/callout.h> 59#include <sys/malloc.h> 60#include <sys/mbuf.h> 61#include <sys/mount.h> 62#include <sys/msgbuf.h> 63#include <sys/ioctl.h> 64#include <sys/sysent.h> 65#include <sys/tty.h> 66#include <sys/sysctl.h> 67#include <sys/devconf.h> 68#include <sys/vmmeter.h> 69 70#ifdef SYSVSHM 71#include <sys/shm.h> 72#endif 73 74#ifdef SYSVMSG 75#include <sys/msg.h> 76#endif 77 78#ifdef SYSVSEM 79#include <sys/sem.h> 80#endif 81 82#include <vm/vm.h> 83#include <vm/vm_param.h> 84#include <vm/vm_prot.h> 85#include <vm/lock.h> 86#include <vm/vm_kern.h> 87#include <vm/vm_object.h> 88#include <vm/vm_page.h> 89#include <vm/vm_map.h> 90#include <vm/vm_pager.h> 91#include <vm/vm_extern.h> 92 93#include <sys/user.h> 94#include <sys/exec.h> 95#include <sys/vnode.h> 96 97#include <ddb/ddb.h> 98 99#include <net/netisr.h> 100 101#include <machine/cpu.h> 102#include <machine/npx.h> 103#include <machine/reg.h> 104#include <machine/psl.h> 105#include <machine/clock.h> 106#include <machine/specialreg.h> 107#include <machine/sysarch.h> 108#include <machine/cons.h> 109#include <machine/devconf.h> 110#include <machine/bootinfo.h> 111#include <machine/md_var.h> 112 113#include <i386/isa/isa.h> 114#include <i386/isa/isa_device.h> 115#include <i386/isa/rtc.h> 116#include <machine/random.h> 117 118extern void init386 __P((int first)); 119extern int ptrace_set_pc __P((struct proc *p, unsigned int addr)); 120extern int ptrace_single_step __P((struct proc *p)); 121extern int ptrace_write_u __P((struct proc *p, vm_offset_t off, int data)); 122extern void dblfault_handler __P((void)); 123 124extern void i486_bzero __P((void *, size_t)); 125extern void i586_bzero __P((void *, size_t)); 126extern void i686_bzero __P((void *, size_t)); 127 128static void cpu_startup __P((void *)); 129SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL) 130 131static void identifycpu(void); 132 133char machine[] = "i386"; 134SYSCTL_STRING(_hw, HW_MACHINE, machine, CTLFLAG_RD, machine, 0, ""); 135 136static char cpu_model[128]; 137SYSCTL_STRING(_hw, HW_MODEL, model, CTLFLAG_RD, cpu_model, 0, ""); 138 139struct kern_devconf kdc_cpu0 = { 140 0, 0, 0, /* filled in by dev_attach */ 141 "cpu", 0, { MDDT_CPU }, 142 0, 0, 0, CPU_EXTERNALLEN, 143 0, /* CPU has no parent */ 144 0, /* no parentdata */ 145 DC_BUSY, /* the CPU is always busy */ 146 cpu_model, /* no sense in duplication */ 147 DC_CLS_CPU /* class */ 148}; 149 150#ifndef PANIC_REBOOT_WAIT_TIME 151#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 152#endif 153 154#ifdef BOUNCE_BUFFERS 155extern char *bouncememory; 156extern int maxbkva; 157#ifdef BOUNCEPAGES 158int bouncepages = BOUNCEPAGES; 159#else 160int bouncepages = 0; 161#endif 162#endif /* BOUNCE_BUFFERS */ 163 164extern int freebufspace; 165int msgbufmapped = 0; /* set when safe to use msgbuf */ 166int _udatasel, _ucodesel; 167 168 169int physmem = 0; 170 171static int 172sysctl_hw_physmem SYSCTL_HANDLER_ARGS 173{ 174 int error = sysctl_handle_int(oidp, 0, ctob(physmem), req); 175 return (error); 176} 177 178SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_INT|CTLFLAG_RD, 179 0, 0, sysctl_hw_physmem, "I", ""); 180 181static int 182sysctl_hw_usermem SYSCTL_HANDLER_ARGS 183{ 184 int error = sysctl_handle_int(oidp, 0, 185 ctob(physmem - cnt.v_wire_count), req); 186 return (error); 187} 188 189SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD, 190 0, 0, sysctl_hw_usermem, "I", ""); 191 192int boothowto = 0, bootverbose = 0, Maxmem = 0; 193static int badpages = 0; 194long dumplo; 195extern int bootdev; 196 197vm_offset_t phys_avail[10]; 198 199/* must be 2 less so 0 0 can signal end of chunks */ 200#define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(vm_offset_t)) - 2) 201 202int cpu_class = CPUCLASS_386; /* smallest common denominator */ 203 204static void dumpsys __P((void)); 205static void setup_netisrs __P((struct linker_set *)); /* XXX declare elsewhere */ 206 207static vm_offset_t buffer_sva, buffer_eva; 208vm_offset_t clean_sva, clean_eva; 209static vm_offset_t pager_sva, pager_eva; 210extern struct linker_set netisr_set; 211 212#define offsetof(type, member) ((size_t)(&((type *)0)->member)) 213 214static void 215cpu_startup(dummy) 216 void *dummy; 217{ 218 register unsigned i; 219 register caddr_t v; 220 vm_offset_t maxaddr; 221 vm_size_t size = 0; 222 int firstaddr; 223 vm_offset_t minaddr; 224 225 if (boothowto & RB_VERBOSE) 226 bootverbose++; 227 228 /* 229 * Initialize error message buffer (at end of core). 230 */ 231 232 /* avail_end was pre-decremented in init_386() to compensate */ 233 for (i = 0; i < btoc(sizeof (struct msgbuf)); i++) 234 pmap_enter(pmap_kernel(), (vm_offset_t)msgbufp, 235 avail_end + i * NBPG, 236 VM_PROT_ALL, TRUE); 237 msgbufmapped = 1; 238 239 /* 240 * Good {morning,afternoon,evening,night}. 241 */ 242 printf(version); 243 startrtclock(); 244 identifycpu(); 245 printf("real memory = %d (%dK bytes)\n", ptoa(Maxmem), ptoa(Maxmem) / 1024); 246 /* 247 * Display any holes after the first chunk of extended memory. 248 */ 249 if (badpages != 0) { 250 int indx = 1; 251 252 /* 253 * XXX skip reporting ISA hole & unmanaged kernel memory 254 */ 255 if (phys_avail[0] == PAGE_SIZE) 256 indx += 2; 257 258 printf("Physical memory hole(s):\n"); 259 for (; phys_avail[indx + 1] != 0; indx += 2) { 260 int size = phys_avail[indx + 1] - phys_avail[indx]; 261 262 printf("0x%08lx - 0x%08lx, %d bytes (%d pages)\n", phys_avail[indx], 263 phys_avail[indx + 1] - 1, size, size / PAGE_SIZE); 264 } 265 } 266 267 /* 268 * Quickly wire in netisrs. 269 */ 270 setup_netisrs(&netisr_set); 271 272/* 273#ifdef ISDN 274 DONET(isdnintr, NETISR_ISDN); 275#endif 276*/ 277 278 /* 279 * Allocate space for system data structures. 280 * The first available kernel virtual address is in "v". 281 * As pages of kernel virtual memory are allocated, "v" is incremented. 282 * As pages of memory are allocated and cleared, 283 * "firstaddr" is incremented. 284 * An index into the kernel page table corresponding to the 285 * virtual memory address maintained in "v" is kept in "mapaddr". 286 */ 287 288 /* 289 * Make two passes. The first pass calculates how much memory is 290 * needed and allocates it. The second pass assigns virtual 291 * addresses to the various data structures. 292 */ 293 firstaddr = 0; 294again: 295 v = (caddr_t)firstaddr; 296 297#define valloc(name, type, num) \ 298 (name) = (type *)v; v = (caddr_t)((name)+(num)) 299#define valloclim(name, type, num, lim) \ 300 (name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num))) 301 valloc(callout, struct callout, ncallout); 302#ifdef SYSVSHM 303 valloc(shmsegs, struct shmid_ds, shminfo.shmmni); 304#endif 305#ifdef SYSVSEM 306 valloc(sema, struct semid_ds, seminfo.semmni); 307 valloc(sem, struct sem, seminfo.semmns); 308 /* This is pretty disgusting! */ 309 valloc(semu, int, (seminfo.semmnu * seminfo.semusz) / sizeof(int)); 310#endif 311#ifdef SYSVMSG 312 valloc(msgpool, char, msginfo.msgmax); 313 valloc(msgmaps, struct msgmap, msginfo.msgseg); 314 valloc(msghdrs, struct msg, msginfo.msgtql); 315 valloc(msqids, struct msqid_ds, msginfo.msgmni); 316#endif 317 318 if (nbuf == 0) { 319 nbuf = 30; 320 if( physmem > 1024) 321 nbuf += min((physmem - 1024) / 12, 1024); 322 } 323 nswbuf = min(nbuf, 128); 324 325 valloc(swbuf, struct buf, nswbuf); 326 valloc(buf, struct buf, nbuf); 327 328#ifdef BOUNCE_BUFFERS 329 /* 330 * If there is more than 16MB of memory, allocate some bounce buffers 331 */ 332 if (Maxmem > 4096) { 333 if (bouncepages == 0) { 334 bouncepages = 64; 335 bouncepages += ((Maxmem - 4096) / 2048) * 32; 336 } 337 v = (caddr_t)((vm_offset_t)((vm_offset_t)v + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1)); 338 valloc(bouncememory, char, bouncepages * PAGE_SIZE); 339 } 340#endif 341 342 /* 343 * End of first pass, size has been calculated so allocate memory 344 */ 345 if (firstaddr == 0) { 346 size = (vm_size_t)(v - firstaddr); 347 firstaddr = (int)kmem_alloc(kernel_map, round_page(size)); 348 if (firstaddr == 0) 349 panic("startup: no room for tables"); 350 goto again; 351 } 352 353 /* 354 * End of second pass, addresses have been assigned 355 */ 356 if ((vm_size_t)(v - firstaddr) != size) 357 panic("startup: table size inconsistency"); 358 359#ifdef BOUNCE_BUFFERS 360 clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva, 361 (nbuf*MAXBSIZE) + (nswbuf*MAXPHYS) + 362 maxbkva + pager_map_size, TRUE); 363 io_map = kmem_suballoc(clean_map, &minaddr, &maxaddr, maxbkva, FALSE); 364#else 365 clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva, 366 (nbuf*MAXBSIZE) + (nswbuf*MAXPHYS) + pager_map_size, TRUE); 367#endif 368 buffer_map = kmem_suballoc(clean_map, &buffer_sva, &buffer_eva, 369 (nbuf*MAXBSIZE), TRUE); 370 pager_map = kmem_suballoc(clean_map, &pager_sva, &pager_eva, 371 (nswbuf*MAXPHYS) + pager_map_size, TRUE); 372 exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, 373 (16*ARG_MAX), TRUE); 374 u_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, 375 (maxproc*UPAGES*PAGE_SIZE), FALSE); 376 377 /* 378 * Finally, allocate mbuf pool. Since mclrefcnt is an off-size 379 * we use the more space efficient malloc in place of kmem_alloc. 380 */ 381 mclrefcnt = (char *)malloc(nmbclusters+CLBYTES/MCLBYTES, 382 M_MBUF, M_NOWAIT); 383 bzero(mclrefcnt, nmbclusters+CLBYTES/MCLBYTES); 384 mb_map = kmem_suballoc(kmem_map, (vm_offset_t *)&mbutl, &maxaddr, 385 nmbclusters * MCLBYTES, FALSE); 386 /* 387 * Initialize callouts 388 */ 389 callfree = callout; 390 for (i = 1; i < ncallout; i++) 391 callout[i-1].c_next = &callout[i]; 392 393 if (boothowto & RB_CONFIG) { 394 userconfig(); 395 cninit(); /* the preferred console may have changed */ 396 } 397 398#ifdef BOUNCE_BUFFERS 399 /* 400 * init bounce buffers 401 */ 402 vm_bounce_init(); 403#endif 404 405 printf("avail memory = %d (%dK bytes)\n", ptoa(cnt.v_free_count), 406 ptoa(cnt.v_free_count) / 1024); 407 408 /* 409 * Set up buffers, so they can be used to read disk labels. 410 */ 411 bufinit(); 412 vm_pager_bufferinit(); 413 414 /* 415 * In verbose mode, print out the BIOS's idea of the disk geometries. 416 */ 417 if (bootverbose) { 418 printf("BIOS Geometries:\n"); 419 for (i = 0; i < N_BIOS_GEOM; i++) { 420 unsigned long bios_geom; 421 int max_cylinder, max_head, max_sector; 422 423 bios_geom = bootinfo.bi_bios_geom[i]; 424 425 /* 426 * XXX the bootstrap punts a 1200K floppy geometry 427 * when the get-disk-geometry interrupt fails. Skip 428 * drives that have this geometry. 429 */ 430 if (bios_geom == 0x4f010f) 431 continue; 432 433 printf(" %x:%08lx ", i, bios_geom); 434 max_cylinder = bios_geom >> 16; 435 max_head = (bios_geom >> 8) & 0xff; 436 max_sector = bios_geom & 0xff; 437 printf( 438 "0..%d=%d cylinders, 0..%d=%d heads, 1..%d=%d sectors\n", 439 max_cylinder, max_cylinder + 1, 440 max_head, max_head + 1, 441 max_sector, max_sector); 442 } 443 printf(" %d accounted for\n", bootinfo.bi_n_bios_used); 444 } 445} 446 447int 448register_netisr(num, handler) 449 int num; 450 netisr_t *handler; 451{ 452 453 if (num < 0 || num >= (sizeof(netisrs)/sizeof(*netisrs)) ) { 454 printf("register_netisr: bad isr number: %d\n", num); 455 return (EINVAL); 456 } 457 netisrs[num] = handler; 458 return (0); 459} 460 461static void 462setup_netisrs(ls) 463 struct linker_set *ls; 464{ 465 int i; 466 const struct netisrtab *nit; 467 468 for(i = 0; ls->ls_items[i]; i++) { 469 nit = (const struct netisrtab *)ls->ls_items[i]; 470 register_netisr(nit->nit_num, nit->nit_isr); 471 } 472} 473 474static struct cpu_nameclass i386_cpus[] = { 475 { "Intel 80286", CPUCLASS_286 }, /* CPU_286 */ 476 { "i386SX", CPUCLASS_386 }, /* CPU_386SX */ 477 { "i386DX", CPUCLASS_386 }, /* CPU_386 */ 478 { "i486SX", CPUCLASS_486 }, /* CPU_486SX */ 479 { "i486DX", CPUCLASS_486 }, /* CPU_486 */ 480 { "Pentium", CPUCLASS_586 }, /* CPU_586 */ 481 { "Cy486DLC", CPUCLASS_486 }, /* CPU_486DLC */ 482 { "Pentium Pro", CPUCLASS_686 }, /* CPU_686 */ 483}; 484 485static void 486identifycpu() 487{ 488 printf("CPU: "); 489 if (cpu >= 0 490 && cpu < (sizeof i386_cpus/sizeof(struct cpu_nameclass))) { 491 cpu_class = i386_cpus[cpu].cpu_class; 492 strncpy(cpu_model, i386_cpus[cpu].cpu_name, sizeof cpu_model); 493 } else { 494 printf("unknown cpu type %d\n", cpu); 495 panic("startup: bad cpu id"); 496 } 497 498#if defined(I586_CPU) || defined(I686_CPU) 499 if (cpu_class == CPUCLASS_586 || cpu_class == CPUCLASS_686) { 500 calibrate_cyclecounter(); 501 } 502#endif 503#if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU) 504 if (!strcmp(cpu_vendor,"GenuineIntel")) { 505 if ((cpu_id & 0xf00) > 3) { 506 cpu_model[0] = '\0'; 507 508 switch (cpu_id & 0x3000) { 509 case 0x1000: 510 strcpy(cpu_model, "Overdrive "); 511 break; 512 case 0x2000: 513 strcpy(cpu_model, "Dual "); 514 break; 515 } 516 517 switch (cpu_id & 0xf00) { 518 case 0x400: 519 strcat(cpu_model, "i486 "); 520 break; 521 case 0x500: 522 strcat(cpu_model, "Pentium"); /* nb no space */ 523 break; 524 case 0x600: 525 strcat(cpu_model, "Pentium Pro"); 526 break; 527 default: 528 strcat(cpu_model, "unknown"); 529 break; 530 } 531 532 switch (cpu_id & 0xff0) { 533 case 0x400: 534 strcat(cpu_model, "DX"); break; 535 case 0x410: 536 strcat(cpu_model, "DX"); break; 537 case 0x420: 538 strcat(cpu_model, "SX"); break; 539 case 0x430: 540 strcat(cpu_model, "DX2"); break; 541 case 0x440: 542 strcat(cpu_model, "SL"); break; 543 case 0x450: 544 strcat(cpu_model, "SX2"); break; 545 case 0x470: 546 strcat(cpu_model, "DX2 Write-Back Enhanced"); 547 break; 548 case 0x480: 549 strcat(cpu_model, "DX4"); break; 550 break; 551 } 552 } 553 } 554#endif 555 printf("%s (", cpu_model); 556 switch(cpu_class) { 557 case CPUCLASS_286: 558 printf("286"); 559 break; 560#if defined(I386_CPU) 561 case CPUCLASS_386: 562 printf("386"); 563 break; 564#endif 565#if defined(I486_CPU) 566 case CPUCLASS_486: 567 printf("486"); 568 bzero = i486_bzero; 569 break; 570#endif 571#if defined(I586_CPU) 572 case CPUCLASS_586: 573 printf("%d.%02d-MHz ", 574 ((100 * i586_ctr_rate) >> I586_CTR_RATE_SHIFT) / 100, 575 ((100 * i586_ctr_rate) >> I586_CTR_RATE_SHIFT) % 100); 576 printf("586"); 577 bzero = i586_bzero; 578 break; 579#endif 580#if defined(I686_CPU) 581 case CPUCLASS_686: 582 printf("%d.%02d-MHz ", 583 ((100 * i586_ctr_rate) >> I586_CTR_RATE_SHIFT) / 100, 584 ((100 * i586_ctr_rate) >> I586_CTR_RATE_SHIFT) % 100); 585 printf("686"); 586 bzero = i686_bzero; 587 break; 588#endif 589 default: 590 printf("unknown"); /* will panic below... */ 591 } 592 printf("-class CPU)\n"); 593#if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU) 594 if(*cpu_vendor) 595 printf(" Origin = \"%s\"",cpu_vendor); 596 if(cpu_id) 597 printf(" Id = 0x%lx",cpu_id); 598 599 if (!strcmp(cpu_vendor, "GenuineIntel")) { 600 printf(" Stepping=%ld", cpu_id & 0xf); 601 if (cpu_high > 0) { 602 printf("\n Features=0x%b", cpu_feature, 603 "\020" 604 "\001FPU" 605 "\002VME" 606 "\003DE" 607 "\004PSE" 608 "\005TSC" 609 "\006MSR" 610 "\007PAE" 611 "\010MCE" 612 "\011CX8" 613 "\012APIC" 614 "\013<b10>" 615 "\014<b11>" 616 "\015MTRR" 617 "\016PGE" 618 "\017MCA" 619 "\020CMOV" 620 ); 621 } 622 } 623 /* Avoid ugly blank lines: only print newline when we have to. */ 624 if (*cpu_vendor || cpu_id) 625 printf("\n"); 626#endif 627 /* 628 * Now that we have told the user what they have, 629 * let them know if that machine type isn't configured. 630 */ 631 switch (cpu_class) { 632 case CPUCLASS_286: /* a 286 should not make it this far, anyway */ 633#if !defined(I386_CPU) && !defined(I486_CPU) && !defined(I586_CPU) && !defined(I686_CPU) 634#error This kernel is not configured for one of the supported CPUs 635#endif 636#if !defined(I386_CPU) 637 case CPUCLASS_386: 638#endif 639#if !defined(I486_CPU) 640 case CPUCLASS_486: 641#endif 642#if !defined(I586_CPU) 643 case CPUCLASS_586: 644#endif 645#if !defined(I686_CPU) 646 case CPUCLASS_686: 647#endif 648 panic("CPU class not configured"); 649 default: 650 break; 651 } 652 dev_attach(&kdc_cpu0); 653} 654 655/* 656 * Send an interrupt to process. 657 * 658 * Stack is set up to allow sigcode stored 659 * at top to call routine, followed by kcall 660 * to sigreturn routine below. After sigreturn 661 * resets the signal mask, the stack, and the 662 * frame pointer, it returns to the user 663 * specified pc, psl. 664 */ 665void 666sendsig(catcher, sig, mask, code) 667 sig_t catcher; 668 int sig, mask; 669 unsigned code; 670{ 671 register struct proc *p = curproc; 672 register int *regs; 673 register struct sigframe *fp; 674 struct sigframe sf; 675 struct sigacts *psp = p->p_sigacts; 676 int oonstack; 677 678 regs = p->p_md.md_regs; 679 oonstack = psp->ps_sigstk.ss_flags & SS_ONSTACK; 680 /* 681 * Allocate and validate space for the signal handler context. 682 */ 683 if ((psp->ps_flags & SAS_ALTSTACK) && !oonstack && 684 (psp->ps_sigonstack & sigmask(sig))) { 685 fp = (struct sigframe *)(psp->ps_sigstk.ss_sp + 686 psp->ps_sigstk.ss_size - sizeof(struct sigframe)); 687 psp->ps_sigstk.ss_flags |= SS_ONSTACK; 688 } else { 689 fp = (struct sigframe *)regs[tESP] - 1; 690 } 691 692 /* 693 * grow() will return FALSE if the fp will not fit inside the stack 694 * and the stack can not be grown. useracc will return FALSE 695 * if access is denied. 696 */ 697 if ((grow(p, (int)fp) == FALSE) || 698 (useracc((caddr_t)fp, sizeof (struct sigframe), B_WRITE) == FALSE)) { 699 /* 700 * Process has trashed its stack; give it an illegal 701 * instruction to halt it in its tracks. 702 */ 703 SIGACTION(p, SIGILL) = SIG_DFL; 704 sig = sigmask(SIGILL); 705 p->p_sigignore &= ~sig; 706 p->p_sigcatch &= ~sig; 707 p->p_sigmask &= ~sig; 708 psignal(p, SIGILL); 709 return; 710 } 711 712 /* 713 * Build the argument list for the signal handler. 714 */ 715 if (p->p_sysent->sv_sigtbl) { 716 if (sig < p->p_sysent->sv_sigsize) 717 sig = p->p_sysent->sv_sigtbl[sig]; 718 else 719 sig = p->p_sysent->sv_sigsize + 1; 720 } 721 sf.sf_signum = sig; 722 sf.sf_code = code; 723 sf.sf_scp = &fp->sf_sc; 724 sf.sf_addr = (char *) regs[tERR]; 725 sf.sf_handler = catcher; 726 727 /* save scratch registers */ 728 sf.sf_sc.sc_eax = regs[tEAX]; 729 sf.sf_sc.sc_ebx = regs[tEBX]; 730 sf.sf_sc.sc_ecx = regs[tECX]; 731 sf.sf_sc.sc_edx = regs[tEDX]; 732 sf.sf_sc.sc_esi = regs[tESI]; 733 sf.sf_sc.sc_edi = regs[tEDI]; 734 sf.sf_sc.sc_cs = regs[tCS]; 735 sf.sf_sc.sc_ds = regs[tDS]; 736 sf.sf_sc.sc_ss = regs[tSS]; 737 sf.sf_sc.sc_es = regs[tES]; 738 sf.sf_sc.sc_isp = regs[tISP]; 739 740 /* 741 * Build the signal context to be used by sigreturn. 742 */ 743 sf.sf_sc.sc_onstack = oonstack; 744 sf.sf_sc.sc_mask = mask; 745 sf.sf_sc.sc_sp = regs[tESP]; 746 sf.sf_sc.sc_fp = regs[tEBP]; 747 sf.sf_sc.sc_pc = regs[tEIP]; 748 sf.sf_sc.sc_ps = regs[tEFLAGS]; 749 750 /* 751 * Copy the sigframe out to the user's stack. 752 */ 753 if (copyout(&sf, fp, sizeof(struct sigframe)) != 0) { 754 /* 755 * Something is wrong with the stack pointer. 756 * ...Kill the process. 757 */ 758 sigexit(p, SIGILL); 759 }; 760 761 regs[tESP] = (int)fp; 762 regs[tEIP] = (int)(((char *)PS_STRINGS) - *(p->p_sysent->sv_szsigcode)); 763 regs[tEFLAGS] &= ~PSL_VM; 764 regs[tCS] = _ucodesel; 765 regs[tDS] = _udatasel; 766 regs[tES] = _udatasel; 767 regs[tSS] = _udatasel; 768} 769 770/* 771 * System call to cleanup state after a signal 772 * has been taken. Reset signal mask and 773 * stack state from context left by sendsig (above). 774 * Return to previous pc and psl as specified by 775 * context left by sendsig. Check carefully to 776 * make sure that the user has not modified the 777 * state to gain improper privileges. 778 */ 779int 780sigreturn(p, uap, retval) 781 struct proc *p; 782 struct sigreturn_args /* { 783 struct sigcontext *sigcntxp; 784 } */ *uap; 785 int *retval; 786{ 787 register struct sigcontext *scp; 788 register struct sigframe *fp; 789 register int *regs = p->p_md.md_regs; 790 int eflags; 791 792 /* 793 * (XXX old comment) regs[tESP] points to the return address. 794 * The user scp pointer is above that. 795 * The return address is faked in the signal trampoline code 796 * for consistency. 797 */ 798 scp = uap->sigcntxp; 799 fp = (struct sigframe *) 800 ((caddr_t)scp - offsetof(struct sigframe, sf_sc)); 801 802 if (useracc((caddr_t)fp, sizeof (*fp), 0) == 0) 803 return(EINVAL); 804 805 /* 806 * Don't allow users to change privileged or reserved flags. 807 */ 808#define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 809 eflags = scp->sc_ps; 810 /* 811 * XXX do allow users to change the privileged flag PSL_RF. The 812 * cpu sets PSL_RF in tf_eflags for faults. Debuggers should 813 * sometimes set it there too. tf_eflags is kept in the signal 814 * context during signal handling and there is no other place 815 * to remember it, so the PSL_RF bit may be corrupted by the 816 * signal handler without us knowing. Corruption of the PSL_RF 817 * bit at worst causes one more or one less debugger trap, so 818 * allowing it is fairly harmless. 819 */ 820 if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs[tEFLAGS] & ~PSL_RF)) { 821#ifdef DEBUG 822 printf("sigreturn: eflags = 0x%x\n", eflags); 823#endif 824 return(EINVAL); 825 } 826 827 /* 828 * Don't allow users to load a valid privileged %cs. Let the 829 * hardware check for invalid selectors, excess privilege in 830 * other selectors, invalid %eip's and invalid %esp's. 831 */ 832#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 833 if (!CS_SECURE(scp->sc_cs)) { 834#ifdef DEBUG 835 printf("sigreturn: cs = 0x%x\n", scp->sc_cs); 836#endif 837 trapsignal(p, SIGBUS, T_PROTFLT); 838 return(EINVAL); 839 } 840 841 /* restore scratch registers */ 842 regs[tEAX] = scp->sc_eax; 843 regs[tEBX] = scp->sc_ebx; 844 regs[tECX] = scp->sc_ecx; 845 regs[tEDX] = scp->sc_edx; 846 regs[tESI] = scp->sc_esi; 847 regs[tEDI] = scp->sc_edi; 848 regs[tCS] = scp->sc_cs; 849 regs[tDS] = scp->sc_ds; 850 regs[tES] = scp->sc_es; 851 regs[tSS] = scp->sc_ss; 852 regs[tISP] = scp->sc_isp; 853 854 if (useracc((caddr_t)scp, sizeof (*scp), 0) == 0) 855 return(EINVAL); 856 857 if (scp->sc_onstack & 01) 858 p->p_sigacts->ps_sigstk.ss_flags |= SS_ONSTACK; 859 else 860 p->p_sigacts->ps_sigstk.ss_flags &= ~SS_ONSTACK; 861 p->p_sigmask = scp->sc_mask &~ 862 (sigmask(SIGKILL)|sigmask(SIGCONT)|sigmask(SIGSTOP)); 863 regs[tEBP] = scp->sc_fp; 864 regs[tESP] = scp->sc_sp; 865 regs[tEIP] = scp->sc_pc; 866 regs[tEFLAGS] = eflags; 867 return(EJUSTRETURN); 868} 869 870static int waittime = -1; 871static struct pcb dumppcb; 872 873__dead void 874boot(howto) 875 int howto; 876{ 877 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 878 register struct buf *bp; 879 int iter, nbusy; 880 881 waittime = 0; 882 printf("\nsyncing disks... "); 883 884 sync(&proc0, NULL, NULL); 885 886 for (iter = 0; iter < 20; iter++) { 887 nbusy = 0; 888 for (bp = &buf[nbuf]; --bp >= buf; ) { 889 if ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) { 890 nbusy++; 891 } 892 } 893 if (nbusy == 0) 894 break; 895 printf("%d ", nbusy); 896 DELAY(40000 * iter); 897 } 898 if (nbusy) { 899 /* 900 * Failed to sync all blocks. Indicate this and don't 901 * unmount filesystems (thus forcing an fsck on reboot). 902 */ 903 printf("giving up\n"); 904#ifdef SHOW_BUSYBUFS 905 nbusy = 0; 906 for (bp = &buf[nbuf]; --bp >= buf; ) { 907 if ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) { 908 nbusy++; 909 printf("%d: dev:%08x, flags:%08x, blkno:%d, lblkno:%d\n", nbusy, bp->b_dev, bp->b_flags, bp->b_blkno, bp->b_lblkno); 910 } 911 } 912 DELAY(5000000); /* 5 seconds */ 913#endif 914 } else { 915 printf("done\n"); 916 /* 917 * Unmount filesystems 918 */ 919 if (panicstr == 0) 920 vfs_unmountall(); 921 } 922 DELAY(100000); /* wait for console output to finish */ 923 dev_shutdownall(FALSE); 924 } 925 splhigh(); 926 if (howto & RB_HALT) { 927 printf("\n"); 928 printf("The operating system has halted.\n"); 929 printf("Please press any key to reboot.\n\n"); 930 cngetc(); 931 } else { 932 if (howto & RB_DUMP) { 933 if (!cold) { 934 savectx(&dumppcb); 935 dumppcb.pcb_ptd = rcr3(); 936 dumpsys(); 937 } 938 939 if (PANIC_REBOOT_WAIT_TIME != 0) { 940 if (PANIC_REBOOT_WAIT_TIME != -1) { 941 int loop; 942 printf("Automatic reboot in %d seconds - press a key on the console to abort\n", 943 PANIC_REBOOT_WAIT_TIME); 944 for (loop = PANIC_REBOOT_WAIT_TIME * 10; loop > 0; --loop) { 945 DELAY(1000 * 100); /* 1/10th second */ 946 if (cncheckc()) /* Did user type a key? */ 947 break; 948 } 949 if (!loop) 950 goto die; 951 } 952 } else { /* zero time specified - reboot NOW */ 953 goto die; 954 } 955 printf("--> Press a key on the console to reboot <--\n"); 956 cngetc(); 957 } 958 } 959die: 960 printf("Rebooting...\n"); 961 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 962 cpu_reset(); 963 for(;;) ; 964 /* NOTREACHED */ 965} 966 967/* 968 * Magic number for savecore 969 * 970 * exported (symorder) and used at least by savecore(8) 971 * 972 */ 973u_long dumpmag = 0x8fca0101UL; 974 975static int dumpsize = 0; /* also for savecore */ 976 977static int dodump = 1; 978SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, ""); 979 980/* 981 * Doadump comes here after turning off memory management and 982 * getting on the dump stack, either when called above, or by 983 * the auto-restart code. 984 */ 985static void 986dumpsys() 987{ 988 989 if (!dodump) 990 return; 991 if (dumpdev == NODEV) 992 return; 993 if ((minor(dumpdev)&07) != 1) 994 return; 995 if (!(bdevsw[major(dumpdev)])) 996 return; 997 if (!(bdevsw[major(dumpdev)]->d_dump)) 998 return; 999 dumpsize = Maxmem; 1000 printf("\ndumping to dev %lx, offset %ld\n", dumpdev, dumplo); 1001 printf("dump "); 1002 switch ((*bdevsw[major(dumpdev)]->d_dump)(dumpdev)) { 1003 1004 case ENXIO: 1005 printf("device bad\n"); 1006 break; 1007 1008 case EFAULT: 1009 printf("device not ready\n"); 1010 break; 1011 1012 case EINVAL: 1013 printf("area improper\n"); 1014 break; 1015 1016 case EIO: 1017 printf("i/o error\n"); 1018 break; 1019 1020 case EINTR: 1021 printf("aborted from console\n"); 1022 break; 1023 1024 default: 1025 printf("succeeded\n"); 1026 break; 1027 } 1028} 1029 1030/* 1031 * Clear registers on exec 1032 */ 1033void 1034setregs(p, entry, stack) 1035 struct proc *p; 1036 u_long entry; 1037 u_long stack; 1038{ 1039 int *regs = p->p_md.md_regs; 1040 1041 bzero(regs, sizeof(struct trapframe)); 1042 regs[tEIP] = entry; 1043 regs[tESP] = stack; 1044 regs[tEFLAGS] = PSL_USER | (regs[tEFLAGS] & PSL_T); 1045 regs[tSS] = _udatasel; 1046 regs[tDS] = _udatasel; 1047 regs[tES] = _udatasel; 1048 regs[tCS] = _ucodesel; 1049 1050 p->p_addr->u_pcb.pcb_flags = 0; /* no fp at all */ 1051 load_cr0(rcr0() | CR0_TS); /* start emulating */ 1052#if NNPX > 0 1053 npxinit(__INITIAL_NPXCW__); 1054#endif /* NNPX > 0 */ 1055} 1056 1057static int 1058sysctl_machdep_adjkerntz SYSCTL_HANDLER_ARGS 1059{ 1060 int error; 1061 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 1062 req); 1063 if (!error && req->newptr) 1064 resettodr(); 1065 return (error); 1066} 1067 1068SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 1069 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 1070 1071SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, 1072 CTLFLAG_RW, &disable_rtc_set, 0, ""); 1073 1074SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo, 1075 CTLFLAG_RD, &bootinfo, bootinfo, ""); 1076 1077/* 1078 * Initialize 386 and configure to run kernel 1079 */ 1080 1081/* 1082 * Initialize segments & interrupt table 1083 */ 1084 1085int currentldt; 1086int _default_ldt; 1087union descriptor gdt[NGDT]; /* global descriptor table */ 1088struct gate_descriptor idt[NIDT]; /* interrupt descriptor table */ 1089union descriptor ldt[NLDT]; /* local descriptor table */ 1090 1091static struct i386tss dblfault_tss; 1092static char dblfault_stack[PAGE_SIZE]; 1093 1094extern struct user *proc0paddr; 1095 1096/* software prototypes -- in more palatable form */ 1097struct soft_segment_descriptor gdt_segs[] = { 1098/* GNULL_SEL 0 Null Descriptor */ 1099{ 0x0, /* segment base address */ 1100 0x0, /* length */ 1101 0, /* segment type */ 1102 0, /* segment descriptor priority level */ 1103 0, /* segment descriptor present */ 1104 0, 0, 1105 0, /* default 32 vs 16 bit size */ 1106 0 /* limit granularity (byte/page units)*/ }, 1107/* GCODE_SEL 1 Code Descriptor for kernel */ 1108{ 0x0, /* segment base address */ 1109 0xfffff, /* length - all address space */ 1110 SDT_MEMERA, /* segment type */ 1111 0, /* segment descriptor priority level */ 1112 1, /* segment descriptor present */ 1113 0, 0, 1114 1, /* default 32 vs 16 bit size */ 1115 1 /* limit granularity (byte/page units)*/ }, 1116/* GDATA_SEL 2 Data Descriptor for kernel */ 1117{ 0x0, /* segment base address */ 1118 0xfffff, /* length - all address space */ 1119 SDT_MEMRWA, /* segment type */ 1120 0, /* segment descriptor priority level */ 1121 1, /* segment descriptor present */ 1122 0, 0, 1123 1, /* default 32 vs 16 bit size */ 1124 1 /* limit granularity (byte/page units)*/ }, 1125/* GLDT_SEL 3 LDT Descriptor */ 1126{ (int) ldt, /* segment base address */ 1127 sizeof(ldt)-1, /* length - all address space */ 1128 SDT_SYSLDT, /* segment type */ 1129 0, /* segment descriptor priority level */ 1130 1, /* segment descriptor present */ 1131 0, 0, 1132 0, /* unused - default 32 vs 16 bit size */ 1133 0 /* limit granularity (byte/page units)*/ }, 1134/* GTGATE_SEL 4 Null Descriptor - Placeholder */ 1135{ 0x0, /* segment base address */ 1136 0x0, /* length - all address space */ 1137 0, /* segment type */ 1138 0, /* segment descriptor priority level */ 1139 0, /* segment descriptor present */ 1140 0, 0, 1141 0, /* default 32 vs 16 bit size */ 1142 0 /* limit granularity (byte/page units)*/ }, 1143/* GPANIC_SEL 5 Panic Tss Descriptor */ 1144{ (int) &dblfault_tss, /* segment base address */ 1145 sizeof(struct i386tss)-1,/* length - all address space */ 1146 SDT_SYS386TSS, /* segment type */ 1147 0, /* segment descriptor priority level */ 1148 1, /* segment descriptor present */ 1149 0, 0, 1150 0, /* unused - default 32 vs 16 bit size */ 1151 0 /* limit granularity (byte/page units)*/ }, 1152/* GPROC0_SEL 6 Proc 0 Tss Descriptor */ 1153{ (int) kstack, /* segment base address */ 1154 sizeof(struct i386tss)-1,/* length - all address space */ 1155 SDT_SYS386TSS, /* segment type */ 1156 0, /* segment descriptor priority level */ 1157 1, /* segment descriptor present */ 1158 0, 0, 1159 0, /* unused - default 32 vs 16 bit size */ 1160 0 /* limit granularity (byte/page units)*/ }, 1161/* GUSERLDT_SEL 7 User LDT Descriptor per process */ 1162{ (int) ldt, /* segment base address */ 1163 (512 * sizeof(union descriptor)-1), /* length */ 1164 SDT_SYSLDT, /* segment type */ 1165 0, /* segment descriptor priority level */ 1166 1, /* segment descriptor present */ 1167 0, 0, 1168 0, /* unused - default 32 vs 16 bit size */ 1169 0 /* limit granularity (byte/page units)*/ }, 1170/* GAPMCODE32_SEL 8 APM BIOS 32-bit interface (32bit Code) */ 1171{ 0, /* segment base address (overwritten by APM) */ 1172 0xfffff, /* length */ 1173 SDT_MEMERA, /* segment type */ 1174 0, /* segment descriptor priority level */ 1175 1, /* segment descriptor present */ 1176 0, 0, 1177 1, /* default 32 vs 16 bit size */ 1178 1 /* limit granularity (byte/page units)*/ }, 1179/* GAPMCODE16_SEL 9 APM BIOS 32-bit interface (16bit Code) */ 1180{ 0, /* segment base address (overwritten by APM) */ 1181 0xfffff, /* length */ 1182 SDT_MEMERA, /* segment type */ 1183 0, /* segment descriptor priority level */ 1184 1, /* segment descriptor present */ 1185 0, 0, 1186 0, /* default 32 vs 16 bit size */ 1187 1 /* limit granularity (byte/page units)*/ }, 1188/* GAPMDATA_SEL 10 APM BIOS 32-bit interface (Data) */ 1189{ 0, /* segment base address (overwritten by APM) */ 1190 0xfffff, /* length */ 1191 SDT_MEMRWA, /* segment type */ 1192 0, /* segment descriptor priority level */ 1193 1, /* segment descriptor present */ 1194 0, 0, 1195 1, /* default 32 vs 16 bit size */ 1196 1 /* limit granularity (byte/page units)*/ }, 1197}; 1198 1199static struct soft_segment_descriptor ldt_segs[] = { 1200 /* Null Descriptor - overwritten by call gate */ 1201{ 0x0, /* segment base address */ 1202 0x0, /* length - all address space */ 1203 0, /* segment type */ 1204 0, /* segment descriptor priority level */ 1205 0, /* segment descriptor present */ 1206 0, 0, 1207 0, /* default 32 vs 16 bit size */ 1208 0 /* limit granularity (byte/page units)*/ }, 1209 /* Null Descriptor - overwritten by call gate */ 1210{ 0x0, /* segment base address */ 1211 0x0, /* length - all address space */ 1212 0, /* segment type */ 1213 0, /* segment descriptor priority level */ 1214 0, /* segment descriptor present */ 1215 0, 0, 1216 0, /* default 32 vs 16 bit size */ 1217 0 /* limit granularity (byte/page units)*/ }, 1218 /* Null Descriptor - overwritten by call gate */ 1219{ 0x0, /* segment base address */ 1220 0x0, /* length - all address space */ 1221 0, /* segment type */ 1222 0, /* segment descriptor priority level */ 1223 0, /* segment descriptor present */ 1224 0, 0, 1225 0, /* default 32 vs 16 bit size */ 1226 0 /* limit granularity (byte/page units)*/ }, 1227 /* Code Descriptor for user */ 1228{ 0x0, /* segment base address */ 1229 0xfffff, /* length - all address space */ 1230 SDT_MEMERA, /* segment type */ 1231 SEL_UPL, /* segment descriptor priority level */ 1232 1, /* segment descriptor present */ 1233 0, 0, 1234 1, /* default 32 vs 16 bit size */ 1235 1 /* limit granularity (byte/page units)*/ }, 1236 /* Data Descriptor for user */ 1237{ 0x0, /* segment base address */ 1238 0xfffff, /* length - all address space */ 1239 SDT_MEMRWA, /* segment type */ 1240 SEL_UPL, /* segment descriptor priority level */ 1241 1, /* segment descriptor present */ 1242 0, 0, 1243 1, /* default 32 vs 16 bit size */ 1244 1 /* limit granularity (byte/page units)*/ }, 1245}; 1246 1247void 1248setidt(idx, func, typ, dpl, selec) 1249 int idx; 1250 inthand_t *func; 1251 int typ; 1252 int dpl; 1253 int selec; 1254{ 1255 struct gate_descriptor *ip = idt + idx; 1256 1257 ip->gd_looffset = (int)func; 1258 ip->gd_selector = selec; 1259 ip->gd_stkcpy = 0; 1260 ip->gd_xx = 0; 1261 ip->gd_type = typ; 1262 ip->gd_dpl = dpl; 1263 ip->gd_p = 1; 1264 ip->gd_hioffset = ((int)func)>>16 ; 1265} 1266 1267#define IDTVEC(name) __CONCAT(X,name) 1268 1269extern inthand_t 1270 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 1271 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 1272 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 1273 IDTVEC(page), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 1274 IDTVEC(syscall), IDTVEC(int0x80_syscall); 1275 1276void 1277sdtossd(sd, ssd) 1278 struct segment_descriptor *sd; 1279 struct soft_segment_descriptor *ssd; 1280{ 1281 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 1282 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 1283 ssd->ssd_type = sd->sd_type; 1284 ssd->ssd_dpl = sd->sd_dpl; 1285 ssd->ssd_p = sd->sd_p; 1286 ssd->ssd_def32 = sd->sd_def32; 1287 ssd->ssd_gran = sd->sd_gran; 1288} 1289 1290void 1291init386(first) 1292 int first; 1293{ 1294 int x; 1295 unsigned biosbasemem, biosextmem; 1296 struct gate_descriptor *gdp; 1297 int gsel_tss; 1298 /* table descriptors - used to load tables by microp */ 1299 struct region_descriptor r_gdt, r_idt; 1300 int pagesinbase, pagesinext; 1301 int target_page, pa_indx; 1302 1303 proc0.p_addr = proc0paddr; 1304 1305 /* 1306 * Initialize the console before we print anything out. 1307 */ 1308 cninit(); 1309 1310 /* 1311 * make gdt memory segments, the code segment goes up to end of the 1312 * page with etext in it, the data segment goes to the end of 1313 * the address space 1314 */ 1315 /* 1316 * XXX text protection is temporarily (?) disabled. The limit was 1317 * i386_btop(round_page(etext)) - 1. 1318 */ 1319 gdt_segs[GCODE_SEL].ssd_limit = i386_btop(0) - 1; 1320 gdt_segs[GDATA_SEL].ssd_limit = i386_btop(0) - 1; 1321 for (x = 0; x < NGDT; x++) 1322 ssdtosd(&gdt_segs[x], &gdt[x].sd); 1323 1324 /* make ldt memory segments */ 1325 /* 1326 * The data segment limit must not cover the user area because we 1327 * don't want the user area to be writable in copyout() etc. (page 1328 * level protection is lost in kernel mode on 386's). Also, we 1329 * don't want the user area to be writable directly (page level 1330 * protection of the user area is not available on 486's with 1331 * CR0_WP set, because there is no user-read/kernel-write mode). 1332 * 1333 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it 1334 * should be spelled ...MAX_USER... 1335 */ 1336#define VM_END_USER_RW_ADDRESS VM_MAXUSER_ADDRESS 1337 /* 1338 * The code segment limit has to cover the user area until we move 1339 * the signal trampoline out of the user area. This is safe because 1340 * the code segment cannot be written to directly. 1341 */ 1342#define VM_END_USER_R_ADDRESS (VM_END_USER_RW_ADDRESS + UPAGES * NBPG) 1343 ldt_segs[LUCODE_SEL].ssd_limit = i386_btop(VM_END_USER_R_ADDRESS) - 1; 1344 ldt_segs[LUDATA_SEL].ssd_limit = i386_btop(VM_END_USER_RW_ADDRESS) - 1; 1345 /* Note. eventually want private ldts per process */ 1346 for (x = 0; x < NLDT; x++) 1347 ssdtosd(&ldt_segs[x], &ldt[x].sd); 1348 1349 /* exceptions */ 1350 for (x = 0; x < NIDT; x++) 1351 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1352 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1353 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1354 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1355 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1356 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1357 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1358 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1359 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1360 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL)); 1361 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1362 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1363 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1364 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1365 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1366 setidt(14, &IDTVEC(page), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1367 setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1368 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1369 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1370 setidt(0x80, &IDTVEC(int0x80_syscall), 1371 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1372 1373#include "isa.h" 1374#if NISA >0 1375 isa_defaultirq(); 1376#endif 1377 rand_initialize(); 1378 1379 r_gdt.rd_limit = sizeof(gdt) - 1; 1380 r_gdt.rd_base = (int) gdt; 1381 lgdt(&r_gdt); 1382 1383 r_idt.rd_limit = sizeof(idt) - 1; 1384 r_idt.rd_base = (int) idt; 1385 lidt(&r_idt); 1386 1387 _default_ldt = GSEL(GLDT_SEL, SEL_KPL); 1388 lldt(_default_ldt); 1389 currentldt = _default_ldt; 1390 1391#ifdef DDB 1392 kdb_init(); 1393 if (boothowto & RB_KDB) 1394 Debugger("Boot flags requested debugger"); 1395#endif 1396 1397 /* Use BIOS values stored in RTC CMOS RAM, since probing 1398 * breaks certain 386 AT relics. 1399 */ 1400 biosbasemem = rtcin(RTC_BASELO)+ (rtcin(RTC_BASEHI)<<8); 1401 biosextmem = rtcin(RTC_EXTLO)+ (rtcin(RTC_EXTHI)<<8); 1402 1403 /* 1404 * Print a warning if the official BIOS interface disagrees 1405 * with the hackish interface used above. Eventually only 1406 * the official interface should be used. 1407 */ 1408 if (bootinfo.bi_memsizes_valid) { 1409 if (bootinfo.bi_basemem != biosbasemem) 1410 printf("BIOS basemem (%ldK) != RTC basemem (%dK)\n", 1411 bootinfo.bi_basemem, biosbasemem); 1412 if (bootinfo.bi_extmem != biosextmem) 1413 printf("BIOS extmem (%ldK) != RTC extmem (%dK)\n", 1414 bootinfo.bi_extmem, biosextmem); 1415 } 1416 1417 /* 1418 * If BIOS tells us that it has more than 640k in the basemem, 1419 * don't believe it - set it to 640k. 1420 */ 1421 if (biosbasemem > 640) 1422 biosbasemem = 640; 1423 1424 /* 1425 * Some 386 machines might give us a bogus number for extended 1426 * mem. If this happens, stop now. 1427 */ 1428#ifndef LARGEMEM 1429 if (biosextmem > 65536) { 1430 panic("extended memory beyond limit of 64MB"); 1431 /* NOTREACHED */ 1432 } 1433#endif 1434 1435 pagesinbase = biosbasemem * 1024 / NBPG; 1436 pagesinext = biosextmem * 1024 / NBPG; 1437 1438 /* 1439 * Special hack for chipsets that still remap the 384k hole when 1440 * there's 16MB of memory - this really confuses people that 1441 * are trying to use bus mastering ISA controllers with the 1442 * "16MB limit"; they only have 16MB, but the remapping puts 1443 * them beyond the limit. 1444 */ 1445 /* 1446 * If extended memory is between 15-16MB (16-17MB phys address range), 1447 * chop it to 15MB. 1448 */ 1449 if ((pagesinext > 3840) && (pagesinext < 4096)) 1450 pagesinext = 3840; 1451 1452 /* 1453 * Maxmem isn't the "maximum memory", it's one larger than the 1454 * highest page of of the physical address space. It 1455 */ 1456 Maxmem = pagesinext + 0x100000/PAGE_SIZE; 1457 1458#ifdef MAXMEM 1459 Maxmem = MAXMEM/4; 1460#endif 1461 1462 /* call pmap initialization to make new kernel address space */ 1463 pmap_bootstrap (first, 0); 1464 1465 /* 1466 * Size up each available chunk of physical memory. 1467 */ 1468 1469 /* 1470 * We currently don't bother testing base memory. 1471 * XXX ...but we probably should. 1472 */ 1473 pa_indx = 0; 1474 badpages = 0; 1475 if (pagesinbase > 1) { 1476 phys_avail[pa_indx++] = PAGE_SIZE; /* skip first page of memory */ 1477 phys_avail[pa_indx] = ptoa(pagesinbase);/* memory up to the ISA hole */ 1478 physmem = pagesinbase - 1; 1479 } else { 1480 /* point at first chunk end */ 1481 pa_indx++; 1482 } 1483 1484 for (target_page = avail_start; target_page < ptoa(Maxmem); target_page += PAGE_SIZE) { 1485 int tmp, page_bad = FALSE; 1486 1487 /* 1488 * map page into kernel: valid, read/write, non-cacheable 1489 */ 1490 *(int *)CMAP1 = PG_V | PG_KW | PG_N | target_page; 1491 pmap_update(); 1492 1493 tmp = *(int *)CADDR1; 1494 /* 1495 * Test for alternating 1's and 0's 1496 */ 1497 *(volatile int *)CADDR1 = 0xaaaaaaaa; 1498 if (*(volatile int *)CADDR1 != 0xaaaaaaaa) { 1499 page_bad = TRUE; 1500 } 1501 /* 1502 * Test for alternating 0's and 1's 1503 */ 1504 *(volatile int *)CADDR1 = 0x55555555; 1505 if (*(volatile int *)CADDR1 != 0x55555555) { 1506 page_bad = TRUE; 1507 } 1508 /* 1509 * Test for all 1's 1510 */ 1511 *(volatile int *)CADDR1 = 0xffffffff; 1512 if (*(volatile int *)CADDR1 != 0xffffffff) { 1513 page_bad = TRUE; 1514 } 1515 /* 1516 * Test for all 0's 1517 */ 1518 *(volatile int *)CADDR1 = 0x0; 1519 if (*(volatile int *)CADDR1 != 0x0) { 1520 /* 1521 * test of page failed 1522 */ 1523 page_bad = TRUE; 1524 } 1525 /* 1526 * Restore original value. 1527 */ 1528 *(int *)CADDR1 = tmp; 1529 1530 /* 1531 * Adjust array of valid/good pages. 1532 */ 1533 if (page_bad == FALSE) { 1534 /* 1535 * If this good page is a continuation of the 1536 * previous set of good pages, then just increase 1537 * the end pointer. Otherwise start a new chunk. 1538 * Note that "end" points one higher than end, 1539 * making the range >= start and < end. 1540 */ 1541 if (phys_avail[pa_indx] == target_page) { 1542 phys_avail[pa_indx] += PAGE_SIZE; 1543 } else { 1544 pa_indx++; 1545 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 1546 printf("Too many holes in the physical address space, giving up\n"); 1547 pa_indx--; 1548 break; 1549 } 1550 phys_avail[pa_indx++] = target_page; /* start */ 1551 phys_avail[pa_indx] = target_page + PAGE_SIZE; /* end */ 1552 } 1553 physmem++; 1554 } else { 1555 badpages++; 1556 page_bad = FALSE; 1557 } 1558 } 1559 1560 *(int *)CMAP1 = 0; 1561 pmap_update(); 1562 1563 /* 1564 * XXX 1565 * The last chunk must contain at least one page plus the message 1566 * buffer to avoid complicating other code (message buffer address 1567 * calculation, etc.). 1568 */ 1569 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 1570 round_page(sizeof(struct msgbuf)) >= phys_avail[pa_indx]) { 1571 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 1572 phys_avail[pa_indx--] = 0; 1573 phys_avail[pa_indx--] = 0; 1574 } 1575 1576 Maxmem = atop(phys_avail[pa_indx]); 1577 1578 /* Trim off space for the message buffer. */ 1579 phys_avail[pa_indx] -= round_page(sizeof(struct msgbuf)); 1580 1581 avail_end = phys_avail[pa_indx]; 1582 1583 /* now running on new page tables, configured,and u/iom is accessible */ 1584 1585 /* make a initial tss so microp can get interrupt stack on syscall! */ 1586 proc0.p_addr->u_pcb.pcb_tss.tss_esp0 = (int) kstack + UPAGES*NBPG; 1587 proc0.p_addr->u_pcb.pcb_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ; 1588 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 1589 1590 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 = 1591 dblfault_tss.tss_esp2 = (int) &dblfault_stack[sizeof(dblfault_stack)]; 1592 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 = 1593 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL); 1594 dblfault_tss.tss_cr3 = IdlePTD; 1595 dblfault_tss.tss_eip = (int) dblfault_handler; 1596 dblfault_tss.tss_eflags = PSL_KERNEL; 1597 dblfault_tss.tss_ds = dblfault_tss.tss_es = dblfault_tss.tss_fs = dblfault_tss.tss_gs = 1598 GSEL(GDATA_SEL, SEL_KPL); 1599 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL); 1600 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL); 1601 1602 ((struct i386tss *)gdt_segs[GPROC0_SEL].ssd_base)->tss_ioopt = 1603 (sizeof(struct i386tss))<<16; 1604 1605 ltr(gsel_tss); 1606 1607 /* make a call gate to reenter kernel with */ 1608 gdp = &ldt[LSYS5CALLS_SEL].gd; 1609 1610 x = (int) &IDTVEC(syscall); 1611 gdp->gd_looffset = x++; 1612 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL); 1613 gdp->gd_stkcpy = 1; 1614 gdp->gd_type = SDT_SYS386CGT; 1615 gdp->gd_dpl = SEL_UPL; 1616 gdp->gd_p = 1; 1617 gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16; 1618 1619 /* transfer to user mode */ 1620 1621 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL); 1622 _udatasel = LSEL(LUDATA_SEL, SEL_UPL); 1623 1624 /* setup proc 0's pcb */ 1625 proc0.p_addr->u_pcb.pcb_flags = 0; 1626 proc0.p_addr->u_pcb.pcb_ptd = IdlePTD; 1627} 1628 1629/* 1630 * The registers are in the frame; the frame is in the user area of 1631 * the process in question; when the process is active, the registers 1632 * are in "the kernel stack"; when it's not, they're still there, but 1633 * things get flipped around. So, since p->p_md.md_regs is the whole address 1634 * of the register set, take its offset from the kernel stack, and 1635 * index into the user block. Don't you just *love* virtual memory? 1636 * (I'm starting to think seymour is right...) 1637 */ 1638#define TF_REGP(p) ((struct trapframe *) \ 1639 ((char *)(p)->p_addr \ 1640 + ((char *)(p)->p_md.md_regs - kstack))) 1641 1642int 1643ptrace_set_pc(p, addr) 1644 struct proc *p; 1645 unsigned int addr; 1646{ 1647 TF_REGP(p)->tf_eip = addr; 1648 return (0); 1649} 1650 1651int 1652ptrace_single_step(p) 1653 struct proc *p; 1654{ 1655 TF_REGP(p)->tf_eflags |= PSL_T; 1656 return (0); 1657} 1658 1659int ptrace_write_u(p, off, data) 1660 struct proc *p; 1661 vm_offset_t off; 1662 int data; 1663{ 1664 struct trapframe frame_copy; 1665 vm_offset_t min; 1666 struct trapframe *tp; 1667 1668 /* 1669 * Privileged kernel state is scattered all over the user area. 1670 * Only allow write access to parts of regs and to fpregs. 1671 */ 1672 min = (char *)p->p_md.md_regs - kstack; 1673 if (off >= min && off <= min + sizeof(struct trapframe) - sizeof(int)) { 1674 tp = TF_REGP(p); 1675 frame_copy = *tp; 1676 *(int *)((char *)&frame_copy + (off - min)) = data; 1677 if (!EFLAGS_SECURE(frame_copy.tf_eflags, tp->tf_eflags) || 1678 !CS_SECURE(frame_copy.tf_cs)) 1679 return (EINVAL); 1680 *(int*)((char *)p->p_addr + off) = data; 1681 return (0); 1682 } 1683 min = offsetof(struct user, u_pcb) + offsetof(struct pcb, pcb_savefpu); 1684 if (off >= min && off <= min + sizeof(struct save87) - sizeof(int)) { 1685 *(int*)((char *)p->p_addr + off) = data; 1686 return (0); 1687 } 1688 return (EFAULT); 1689} 1690 1691int 1692fill_regs(p, regs) 1693 struct proc *p; 1694 struct reg *regs; 1695{ 1696 struct trapframe *tp; 1697 1698 tp = TF_REGP(p); 1699 regs->r_es = tp->tf_es; 1700 regs->r_ds = tp->tf_ds; 1701 regs->r_edi = tp->tf_edi; 1702 regs->r_esi = tp->tf_esi; 1703 regs->r_ebp = tp->tf_ebp; 1704 regs->r_ebx = tp->tf_ebx; 1705 regs->r_edx = tp->tf_edx; 1706 regs->r_ecx = tp->tf_ecx; 1707 regs->r_eax = tp->tf_eax; 1708 regs->r_eip = tp->tf_eip; 1709 regs->r_cs = tp->tf_cs; 1710 regs->r_eflags = tp->tf_eflags; 1711 regs->r_esp = tp->tf_esp; 1712 regs->r_ss = tp->tf_ss; 1713 return (0); 1714} 1715 1716int 1717set_regs(p, regs) 1718 struct proc *p; 1719 struct reg *regs; 1720{ 1721 struct trapframe *tp; 1722 1723 tp = TF_REGP(p); 1724 if (!EFLAGS_SECURE(regs->r_eflags, tp->tf_eflags) || 1725 !CS_SECURE(regs->r_cs)) 1726 return (EINVAL); 1727 tp->tf_es = regs->r_es; 1728 tp->tf_ds = regs->r_ds; 1729 tp->tf_edi = regs->r_edi; 1730 tp->tf_esi = regs->r_esi; 1731 tp->tf_ebp = regs->r_ebp; 1732 tp->tf_ebx = regs->r_ebx; 1733 tp->tf_edx = regs->r_edx; 1734 tp->tf_ecx = regs->r_ecx; 1735 tp->tf_eax = regs->r_eax; 1736 tp->tf_eip = regs->r_eip; 1737 tp->tf_cs = regs->r_cs; 1738 tp->tf_eflags = regs->r_eflags; 1739 tp->tf_esp = regs->r_esp; 1740 tp->tf_ss = regs->r_ss; 1741 return (0); 1742} 1743 1744#ifndef DDB 1745void 1746Debugger(const char *msg) 1747{ 1748 printf("Debugger(\"%s\") called.\n", msg); 1749} 1750#endif /* no DDB */ 1751 1752#include <sys/disklabel.h> 1753#define b_cylin b_resid 1754/* 1755 * Determine the size of the transfer, and make sure it is 1756 * within the boundaries of the partition. Adjust transfer 1757 * if needed, and signal errors or early completion. 1758 */ 1759int 1760bounds_check_with_label(struct buf *bp, struct disklabel *lp, int wlabel) 1761{ 1762 struct partition *p = lp->d_partitions + dkpart(bp->b_dev); 1763 int labelsect = lp->d_partitions[0].p_offset; 1764 int maxsz = p->p_size, 1765 sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT; 1766 1767 /* overwriting disk label ? */ 1768 /* XXX should also protect bootstrap in first 8K */ 1769 if (bp->b_blkno + p->p_offset <= LABELSECTOR + labelsect && 1770#if LABELSECTOR != 0 1771 bp->b_blkno + p->p_offset + sz > LABELSECTOR + labelsect && 1772#endif 1773 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 1774 bp->b_error = EROFS; 1775 goto bad; 1776 } 1777 1778#if defined(DOSBBSECTOR) && defined(notyet) 1779 /* overwriting master boot record? */ 1780 if (bp->b_blkno + p->p_offset <= DOSBBSECTOR && 1781 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 1782 bp->b_error = EROFS; 1783 goto bad; 1784 } 1785#endif 1786 1787 /* beyond partition? */ 1788 if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz) { 1789 /* if exactly at end of disk, return an EOF */ 1790 if (bp->b_blkno == maxsz) { 1791 bp->b_resid = bp->b_bcount; 1792 return(0); 1793 } 1794 /* or truncate if part of it fits */ 1795 sz = maxsz - bp->b_blkno; 1796 if (sz <= 0) { 1797 bp->b_error = EINVAL; 1798 goto bad; 1799 } 1800 bp->b_bcount = sz << DEV_BSHIFT; 1801 } 1802 1803 /* calculate cylinder for disksort to order transfers with */ 1804 bp->b_pblkno = bp->b_blkno + p->p_offset; 1805 bp->b_cylin = bp->b_pblkno / lp->d_secpercyl; 1806 return(1); 1807 1808bad: 1809 bp->b_flags |= B_ERROR; 1810 return(-1); 1811} 1812 1813int 1814disk_externalize(int drive, struct sysctl_req *req) 1815{ 1816 return SYSCTL_OUT(req, &drive, sizeof drive); 1817} 1818