machdep.c revision 9578
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 1.132 1995/07/16 10:33:38 phk Exp $ 39 */ 40 41#include "npx.h" 42#include "isa.h" 43 44#include <sys/param.h> 45#include <sys/systm.h> 46#include <sys/signalvar.h> 47#include <sys/kernel.h> 48#include <sys/proc.h> 49#include <sys/user.h> 50#include <sys/buf.h> 51#include <sys/reboot.h> 52#include <sys/conf.h> 53#include <sys/file.h> 54#include <sys/callout.h> 55#include <sys/malloc.h> 56#include <sys/mbuf.h> 57#include <sys/mount.h> 58#include <sys/msgbuf.h> 59#include <sys/ioctl.h> 60#include <sys/sysent.h> 61#include <sys/tty.h> 62#include <sys/sysctl.h> 63#include <sys/devconf.h> 64 65#ifdef SYSVSHM 66#include <sys/shm.h> 67#endif 68 69#ifdef SYSVMSG 70#include <sys/msg.h> 71#endif 72 73#ifdef SYSVSEM 74#include <sys/sem.h> 75#endif 76 77#include <vm/vm.h> 78#include <vm/vm_kern.h> 79#include <vm/vm_page.h> 80#include <vm/vm_pager.h> 81 82#include <sys/exec.h> 83#include <sys/vnode.h> 84 85#include <ddb/ddb.h> 86 87#include <net/netisr.h> 88 89/* XXX correctly declaring all the netisr's is painful. */ 90#include <net/if.h> 91#include <net/route.h> 92 93#include <netinet/in.h> 94#include <netinet/in_systm.h> 95#include <netinet/ip.h> 96#include <netinet/if_ether.h> 97#include <netinet/ip_var.h> 98 99#include <netns/ns.h> 100#include <netns/ns_if.h> 101 102#include <netiso/iso.h> 103#include <netiso/iso_var.h> 104 105#include <netccitt/dll.h> 106#include <netccitt/x25.h> 107#include <netccitt/pk.h> 108#include <sys/socketvar.h> 109#include <netccitt/pk_var.h> 110 111#include "ether.h" 112 113#include <machine/cpu.h> 114#include <machine/npx.h> 115#include <machine/reg.h> 116#include <machine/psl.h> 117#include <machine/clock.h> 118#include <machine/specialreg.h> 119#include <machine/sysarch.h> 120#include <machine/cons.h> 121#include <machine/devconf.h> 122#include <machine/bootinfo.h> 123#include <machine/md_var.h> 124 125#include <i386/isa/isa.h> 126#include <i386/isa/isa_device.h> 127#include <i386/isa/rtc.h> 128 129static void identifycpu(void); 130static void initcpu(void); 131 132char machine[] = "i386"; 133char cpu_model[128]; 134 135struct kern_devconf kdc_cpu0 = { 136 0, 0, 0, /* filled in by dev_attach */ 137 "cpu", 0, { MDDT_CPU }, 138 0, 0, 0, CPU_EXTERNALLEN, 139 0, /* CPU has no parent */ 140 0, /* no parentdata */ 141 DC_BUSY, /* the CPU is always busy */ 142 cpu_model, /* no sense in duplication */ 143 DC_CLS_CPU /* class */ 144}; 145 146#ifndef PANIC_REBOOT_WAIT_TIME 147#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 148#endif 149 150/* 151 * Declare these as initialized data so we can patch them. 152 */ 153int nswbuf = 0; 154#ifdef NBUF 155int nbuf = NBUF; 156#else 157int nbuf = 0; 158#endif 159 160#ifdef BOUNCE_BUFFERS 161extern char *bouncememory; 162extern int maxbkva; 163#ifdef BOUNCEPAGES 164int bouncepages = BOUNCEPAGES; 165#else 166int bouncepages = 0; 167#endif 168#endif /* BOUNCE_BUFFERS */ 169 170extern int freebufspace; 171int msgbufmapped = 0; /* set when safe to use msgbuf */ 172int _udatasel, _ucodesel; 173 174 175/* 176 * Machine-dependent startup code 177 */ 178int boothowto = 0, bootverbose = 0, Maxmem = 0, badpages = 0, physmem = 0; 179long dumplo; 180extern int bootdev; 181int biosmem; 182 183vm_offset_t phys_avail[10]; 184 185/* must be 2 less so 0 0 can signal end of chunks */ 186#define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(vm_offset_t)) - 2) 187 188int cpu_class; 189 190void dumpsys __P((void)); 191void setup_netisrs __P((struct linker_set *)); /* XXX declare elsewhere */ 192 193vm_offset_t buffer_sva, buffer_eva; 194vm_offset_t clean_sva, clean_eva; 195vm_offset_t pager_sva, pager_eva; 196extern int pager_map_size; 197extern struct linker_set netisr_set; 198 199#define offsetof(type, member) ((size_t)(&((type *)0)->member)) 200 201void 202cpu_startup() 203{ 204 register unsigned i; 205 register caddr_t v; 206 vm_offset_t maxaddr; 207 vm_size_t size = 0; 208 int firstaddr, indx; 209 vm_offset_t minaddr; 210 211 if (boothowto & RB_VERBOSE) 212 bootverbose++; 213 214 /* 215 * Initialize error message buffer (at end of core). 216 */ 217 218 /* avail_end was pre-decremented in init_386() to compensate */ 219 for (i = 0; i < btoc(sizeof (struct msgbuf)); i++) 220 pmap_enter(pmap_kernel(), (vm_offset_t)msgbufp, 221 avail_end + i * NBPG, 222 VM_PROT_ALL, TRUE); 223 msgbufmapped = 1; 224 225 /* 226 * Good {morning,afternoon,evening,night}. 227 */ 228 printf(version); 229 startrtclock(); 230 identifycpu(); 231 /* 232 * Display any holes after the first chunk of extended memory. 233 */ 234 if (badpages != 0) { 235 int indx = 1; 236 237 /* 238 * XXX skip reporting ISA hole & unmanaged kernel memory 239 */ 240 if (phys_avail[0] == PAGE_SIZE) 241 indx += 2; 242 243 printf("Physical memory hole(s):\n"); 244 for (; phys_avail[indx + 1] != 0; indx += 2) { 245 int size = phys_avail[indx + 1] - phys_avail[indx]; 246 247 printf("0x%08x - 0x%08x, %d bytes (%d pages)\n", phys_avail[indx], 248 phys_avail[indx + 1] - 1, size, size / PAGE_SIZE); 249 } 250 } 251 252 /* 253 * Quickly wire in netisrs. 254 */ 255 setup_netisrs(&netisr_set); 256 257/* 258#ifdef ISDN 259 DONET(isdnintr, NETISR_ISDN); 260#endif 261*/ 262 263 /* 264 * Allocate space for system data structures. 265 * The first available kernel virtual address is in "v". 266 * As pages of kernel virtual memory are allocated, "v" is incremented. 267 * As pages of memory are allocated and cleared, 268 * "firstaddr" is incremented. 269 * An index into the kernel page table corresponding to the 270 * virtual memory address maintained in "v" is kept in "mapaddr". 271 */ 272 273 /* 274 * Make two passes. The first pass calculates how much memory is 275 * needed and allocates it. The second pass assigns virtual 276 * addresses to the various data structures. 277 */ 278 firstaddr = 0; 279again: 280 v = (caddr_t)firstaddr; 281 282#define valloc(name, type, num) \ 283 (name) = (type *)v; v = (caddr_t)((name)+(num)) 284#define valloclim(name, type, num, lim) \ 285 (name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num))) 286 valloc(callout, struct callout, ncallout); 287#ifdef SYSVSHM 288 valloc(shmsegs, struct shmid_ds, shminfo.shmmni); 289#endif 290#ifdef SYSVSEM 291 valloc(sema, struct semid_ds, seminfo.semmni); 292 valloc(sem, struct sem, seminfo.semmns); 293 /* This is pretty disgusting! */ 294 valloc(semu, int, (seminfo.semmnu * seminfo.semusz) / sizeof(int)); 295#endif 296#ifdef SYSVMSG 297 valloc(msgpool, char, msginfo.msgmax); 298 valloc(msgmaps, struct msgmap, msginfo.msgseg); 299 valloc(msghdrs, struct msg, msginfo.msgtql); 300 valloc(msqids, struct msqid_ds, msginfo.msgmni); 301#endif 302 303 if (nbuf == 0) { 304 nbuf = 30; 305 if( physmem > 1024) 306 nbuf += min((physmem - 1024) / 12, 1024); 307 } 308 nswbuf = min(nbuf, 128); 309 310 valloc(swbuf, struct buf, nswbuf); 311 valloc(buf, struct buf, nbuf); 312 313#ifdef BOUNCE_BUFFERS 314 /* 315 * If there is more than 16MB of memory, allocate some bounce buffers 316 */ 317 if (Maxmem > 4096) { 318 if (bouncepages == 0) { 319 bouncepages = 64; 320 bouncepages += ((Maxmem - 4096) / 2048) * 32; 321 } 322 v = (caddr_t)((vm_offset_t)((vm_offset_t)v + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1)); 323 valloc(bouncememory, char, bouncepages * PAGE_SIZE); 324 } 325#endif 326 327 /* 328 * End of first pass, size has been calculated so allocate memory 329 */ 330 if (firstaddr == 0) { 331 size = (vm_size_t)(v - firstaddr); 332 firstaddr = (int)kmem_alloc(kernel_map, round_page(size)); 333 if (firstaddr == 0) 334 panic("startup: no room for tables"); 335 goto again; 336 } 337 338 /* 339 * End of second pass, addresses have been assigned 340 */ 341 if ((vm_size_t)(v - firstaddr) != size) 342 panic("startup: table size inconsistency"); 343 344#ifdef BOUNCE_BUFFERS 345 clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva, 346 (nbuf*MAXBSIZE) + (nswbuf*MAXPHYS) + 347 maxbkva + pager_map_size, TRUE); 348 io_map = kmem_suballoc(clean_map, &minaddr, &maxaddr, maxbkva, FALSE); 349#else 350 clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva, 351 (nbuf*MAXBSIZE) + (nswbuf*MAXPHYS) + pager_map_size, TRUE); 352#endif 353 buffer_map = kmem_suballoc(clean_map, &buffer_sva, &buffer_eva, 354 (nbuf*MAXBSIZE), TRUE); 355 pager_map = kmem_suballoc(clean_map, &pager_sva, &pager_eva, 356 (nswbuf*MAXPHYS) + pager_map_size, TRUE); 357 exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, 358 (16*ARG_MAX), TRUE); 359 u_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, 360 (maxproc*UPAGES*PAGE_SIZE), FALSE); 361 362 /* 363 * Finally, allocate mbuf pool. Since mclrefcnt is an off-size 364 * we use the more space efficient malloc in place of kmem_alloc. 365 */ 366 mclrefcnt = (char *)malloc(nmbclusters+CLBYTES/MCLBYTES, 367 M_MBUF, M_NOWAIT); 368 bzero(mclrefcnt, nmbclusters+CLBYTES/MCLBYTES); 369 mb_map = kmem_suballoc(kmem_map, (vm_offset_t *)&mbutl, &maxaddr, 370 nmbclusters * MCLBYTES, FALSE); 371 /* 372 * Initialize callouts 373 */ 374 callfree = callout; 375 for (i = 1; i < ncallout; i++) 376 callout[i-1].c_next = &callout[i]; 377 378 if (boothowto & RB_CONFIG) 379 userconfig(); 380 printf("avail memory = %d (%d pages)\n", ptoa(cnt.v_free_count), cnt.v_free_count); 381 382#ifdef BOUNCE_BUFFERS 383 /* 384 * init bounce buffers 385 */ 386 vm_bounce_init(); 387#endif 388 389 /* 390 * Set up CPU-specific registers, cache, etc. 391 */ 392 initcpu(); 393 394 /* 395 * Set up buffers, so they can be used to read disk labels. 396 */ 397 bufinit(); 398 vm_pager_bufferinit(); 399 400 /* 401 * Configure the system. 402 */ 403 configure(); 404 if (bootverbose) { 405 printf("BIOS Geometries:\n"); 406 for (i=0; i < N_BIOS_GEOM; i++) { 407 int j = bootinfo.bi_bios_geom[i]; 408 if (j == 0x4f010f) 409 continue; 410 printf(" %x:%08x", i, j); 411 printf(" %d cyl, %d heads, %d sects\n", 412 j >> 16, (j >> 8) & 0xff, j & 0xff); 413 414 } 415 printf(" %d accounted for\n", bootinfo.bi_n_bios_used); 416 } 417} 418 419void 420setup_netisrs(struct linker_set *ls) 421{ 422 int i; 423 const struct netisrtab *nit; 424 425 for(i = 0; ls->ls_items[i]; i++) { 426 nit = (const struct netisrtab *)ls->ls_items[i]; 427 netisrs[nit->nit_num] = nit->nit_isr; 428 } 429} 430 431struct cpu_nameclass i386_cpus[] = { 432 { "Intel 80286", CPUCLASS_286 }, /* CPU_286 */ 433 { "i386SX", CPUCLASS_386 }, /* CPU_386SX */ 434 { "i386DX", CPUCLASS_386 }, /* CPU_386 */ 435 { "i486SX", CPUCLASS_486 }, /* CPU_486SX */ 436 { "i486DX", CPUCLASS_486 }, /* CPU_486 */ 437 { "Pentium", CPUCLASS_586 }, /* CPU_586 */ 438 { "Cy486DLC", CPUCLASS_486 }, /* CPU_486DLC */ 439}; 440 441static void 442identifycpu() 443{ 444 printf("CPU: "); 445 if (cpu >= 0 446 && cpu < (sizeof i386_cpus/sizeof(struct cpu_nameclass))) { 447 cpu_class = i386_cpus[cpu].cpu_class; 448 strncpy(cpu_model, i386_cpus[cpu].cpu_name, sizeof cpu_model); 449 } else { 450 printf("unknown cpu type %d\n", cpu); 451 panic("startup: bad cpu id"); 452 } 453 454#if defined(I586_CPU) 455 if(cpu_class == CPUCLASS_586) { 456 calibrate_cyclecounter(); 457 printf("%d-MHz ", pentium_mhz); 458 } 459#endif 460#if defined(I486_CPU) || defined(I586_CPU) 461 if (!strcmp(cpu_vendor,"GenuineIntel")) { 462 if ((cpu_id & 0xf00) > 3) { 463 cpu_model[0] = '\0'; 464 465 switch (cpu_id & 0x3000) { 466 case 0x1000: 467 strcpy(cpu_model, "Overdrive "); 468 break; 469 case 0x2000: 470 strcpy(cpu_model, "Dual "); 471 break; 472 } 473 if ((cpu_id & 0xf00) == 0x400) { 474 strcat(cpu_model, "i486 "); 475#if defined(I586_CPU) 476 } else if ((cpu_id & 0xf00) == 0x500) { 477 strcat(cpu_model, "Pentium "); 478#endif 479 } else { 480 strcat(cpu_model, "unknown "); 481 } 482 483 switch (cpu_id & 0xff0) { 484 case 0x400: 485 strcat(cpu_model, "DX"); break; 486 case 0x410: 487 strcat(cpu_model, "DX"); break; 488 case 0x420: 489 strcat(cpu_model, "SX"); break; 490 case 0x430: 491 strcat(cpu_model, "DX2"); break; 492 case 0x440: 493 strcat(cpu_model, "SL"); break; 494 case 0x450: 495 strcat(cpu_model, "SX2"); break; 496 case 0x470: 497 strcat(cpu_model, "DX2 Write-Back Enhanced"); 498 break; 499 case 0x480: 500 strcat(cpu_model, "DX4"); break; 501#if defined(I586_CPU) 502 case 0x510: 503 if (pentium_mhz == 60) { 504 strcat(cpu_model, "510\\60"); 505 } else if (pentium_mhz == 66) { 506 strcat(cpu_model, "567\\66"); 507 } else { 508 strcat(cpu_model,"510\\60 or 567\\66"); 509 } 510 break; 511 case 0x520: 512 if (pentium_mhz == 90) { 513 strcat(cpu_model, "735\\90"); 514 } else if (pentium_mhz == 100) { 515 strcat(cpu_model, "815\\100"); 516 } else { 517 strcat(cpu_model,"735\\90 or 815\\100"); 518 } 519 break; 520#endif 521 } 522 } 523 } 524#endif 525 printf("%s (", cpu_model); 526 switch(cpu_class) { 527 case CPUCLASS_286: 528 printf("286"); 529 break; 530#if defined(I386_CPU) 531 case CPUCLASS_386: 532 printf("386"); 533 break; 534#endif 535#if defined(I486_CPU) 536 case CPUCLASS_486: 537 printf("486"); 538 break; 539#endif 540#if defined(I586_CPU) 541 case CPUCLASS_586: 542 printf("Pentium"); 543 break; 544#endif 545 default: 546 printf("unknown"); /* will panic below... */ 547 } 548 printf("-class CPU)\n"); 549#if defined(I486_CPU) || defined(I586_CPU) 550 if(*cpu_vendor) 551 printf(" Origin = \"%s\"",cpu_vendor); 552 if(cpu_id) 553 printf(" Id = 0x%lx",cpu_id); 554 555 if (!strcmp(cpu_vendor, "GenuineIntel")) { 556 printf(" Stepping=%ld", cpu_id & 0xf); 557 if (cpu_high > 0) { 558#define FEATUREFMT "\020\001FPU\002VME\003PSE\004MCE\005CX8\006APIC" 559 printf("\n Features=0x%b", cpu_feature, FEATUREFMT); 560 } 561 } 562 /* Avoid ugly blank lines: only print newline when we have to. */ 563 if (*cpu_vendor || cpu_id) 564 printf("\n"); 565#endif 566 /* 567 * Now that we have told the user what they have, 568 * let them know if that machine type isn't configured. 569 */ 570 switch (cpu_class) { 571 case CPUCLASS_286: /* a 286 should not make it this far, anyway */ 572#if !defined(I386_CPU) && !defined(I486_CPU) && !defined(I586_CPU) 573#error This kernel is not configured for one of the supported CPUs 574#endif 575#if !defined(I386_CPU) 576 case CPUCLASS_386: 577#endif 578#if !defined(I486_CPU) 579 case CPUCLASS_486: 580#endif 581#if !defined(I586_CPU) 582 case CPUCLASS_586: 583#endif 584 panic("CPU class not configured"); 585 default: 586 break; 587 } 588 dev_attach(&kdc_cpu0); 589} 590 591/* 592 * Send an interrupt to process. 593 * 594 * Stack is set up to allow sigcode stored 595 * in u. to call routine, followed by kcall 596 * to sigreturn routine below. After sigreturn 597 * resets the signal mask, the stack, and the 598 * frame pointer, it returns to the user 599 * specified pc, psl. 600 */ 601void 602sendsig(catcher, sig, mask, code) 603 sig_t catcher; 604 int sig, mask; 605 unsigned code; 606{ 607 register struct proc *p = curproc; 608 register int *regs; 609 register struct sigframe *fp; 610 struct sigframe sf; 611 struct sigacts *psp = p->p_sigacts; 612 int oonstack; 613 614 regs = p->p_md.md_regs; 615 oonstack = psp->ps_sigstk.ss_flags & SA_ONSTACK; 616 /* 617 * Allocate and validate space for the signal handler 618 * context. Note that if the stack is in P0 space, the 619 * call to grow() is a nop, and the useracc() check 620 * will fail if the process has not already allocated 621 * the space with a `brk'. 622 */ 623 if ((psp->ps_flags & SAS_ALTSTACK) && 624 (psp->ps_sigstk.ss_flags & SA_ONSTACK) == 0 && 625 (psp->ps_sigonstack & sigmask(sig))) { 626 fp = (struct sigframe *)(psp->ps_sigstk.ss_sp + 627 psp->ps_sigstk.ss_size - sizeof(struct sigframe)); 628 psp->ps_sigstk.ss_flags |= SA_ONSTACK; 629 } else { 630 fp = (struct sigframe *)(regs[tESP] 631 - sizeof(struct sigframe)); 632 } 633 634 /* 635 * grow() will return FALSE if the fp will not fit inside the stack 636 * and the stack can not be grown. useracc will return FALSE 637 * if access is denied. 638 */ 639 if ((grow(p, (int)fp) == FALSE) || 640 (useracc((caddr_t)fp, sizeof (struct sigframe), B_WRITE) == FALSE)) { 641 /* 642 * Process has trashed its stack; give it an illegal 643 * instruction to halt it in its tracks. 644 */ 645 SIGACTION(p, SIGILL) = SIG_DFL; 646 sig = sigmask(SIGILL); 647 p->p_sigignore &= ~sig; 648 p->p_sigcatch &= ~sig; 649 p->p_sigmask &= ~sig; 650 psignal(p, SIGILL); 651 return; 652 } 653 654 /* 655 * Build the argument list for the signal handler. 656 */ 657 if (p->p_sysent->sv_sigtbl) { 658 if (sig < p->p_sysent->sv_sigsize) 659 sig = p->p_sysent->sv_sigtbl[sig]; 660 else 661 sig = p->p_sysent->sv_sigsize + 1; 662 } 663 sf.sf_signum = sig; 664 sf.sf_code = code; 665 sf.sf_scp = &fp->sf_sc; 666 sf.sf_addr = (char *) regs[tERR]; 667 sf.sf_handler = catcher; 668 669 /* save scratch registers */ 670 sf.sf_sc.sc_eax = regs[tEAX]; 671 sf.sf_sc.sc_ebx = regs[tEBX]; 672 sf.sf_sc.sc_ecx = regs[tECX]; 673 sf.sf_sc.sc_edx = regs[tEDX]; 674 sf.sf_sc.sc_esi = regs[tESI]; 675 sf.sf_sc.sc_edi = regs[tEDI]; 676 sf.sf_sc.sc_cs = regs[tCS]; 677 sf.sf_sc.sc_ds = regs[tDS]; 678 sf.sf_sc.sc_ss = regs[tSS]; 679 sf.sf_sc.sc_es = regs[tES]; 680 sf.sf_sc.sc_isp = regs[tISP]; 681 682 /* 683 * Build the signal context to be used by sigreturn. 684 */ 685 sf.sf_sc.sc_onstack = oonstack; 686 sf.sf_sc.sc_mask = mask; 687 sf.sf_sc.sc_sp = regs[tESP]; 688 sf.sf_sc.sc_fp = regs[tEBP]; 689 sf.sf_sc.sc_pc = regs[tEIP]; 690 sf.sf_sc.sc_ps = regs[tEFLAGS]; 691 692 /* 693 * Copy the sigframe out to the user's stack. 694 */ 695 if (copyout(&sf, fp, sizeof(struct sigframe)) != 0) { 696 /* 697 * Something is wrong with the stack pointer. 698 * ...Kill the process. 699 */ 700 sigexit(p, SIGILL); 701 }; 702 703 regs[tESP] = (int)fp; 704 regs[tEIP] = (int)((struct pcb *)kstack)->pcb_sigc; 705 regs[tEFLAGS] &= ~PSL_VM; 706 regs[tCS] = _ucodesel; 707 regs[tDS] = _udatasel; 708 regs[tES] = _udatasel; 709 regs[tSS] = _udatasel; 710} 711 712/* 713 * System call to cleanup state after a signal 714 * has been taken. Reset signal mask and 715 * stack state from context left by sendsig (above). 716 * Return to previous pc and psl as specified by 717 * context left by sendsig. Check carefully to 718 * make sure that the user has not modified the 719 * state to gain improper privileges. 720 */ 721struct sigreturn_args { 722 struct sigcontext *sigcntxp; 723}; 724 725int 726sigreturn(p, uap, retval) 727 struct proc *p; 728 struct sigreturn_args *uap; 729 int *retval; 730{ 731 register struct sigcontext *scp; 732 register struct sigframe *fp; 733 register int *regs = p->p_md.md_regs; 734 int eflags; 735 736 /* 737 * (XXX old comment) regs[tESP] points to the return address. 738 * The user scp pointer is above that. 739 * The return address is faked in the signal trampoline code 740 * for consistency. 741 */ 742 scp = uap->sigcntxp; 743 fp = (struct sigframe *) 744 ((caddr_t)scp - offsetof(struct sigframe, sf_sc)); 745 746 if (useracc((caddr_t)fp, sizeof (*fp), 0) == 0) 747 return(EINVAL); 748 749 /* 750 * Don't allow users to change privileged or reserved flags. 751 */ 752#define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 753 eflags = scp->sc_ps; 754 /* 755 * XXX do allow users to change the privileged flag PSL_RF. The 756 * cpu sets PSL_RF in tf_eflags for faults. Debuggers should 757 * sometimes set it there too. tf_eflags is kept in the signal 758 * context during signal handling and there is no other place 759 * to remember it, so the PSL_RF bit may be corrupted by the 760 * signal handler without us knowing. Corruption of the PSL_RF 761 * bit at worst causes one more or one less debugger trap, so 762 * allowing it is fairly harmless. 763 */ 764 if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs[tEFLAGS] & ~PSL_RF)) { 765#ifdef DEBUG 766 printf("sigreturn: eflags = 0x%x\n", eflags); 767#endif 768 return(EINVAL); 769 } 770 771 /* 772 * Don't allow users to load a valid privileged %cs. Let the 773 * hardware check for invalid selectors, excess privilege in 774 * other selectors, invalid %eip's and invalid %esp's. 775 */ 776#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 777 if (!CS_SECURE(scp->sc_cs)) { 778#ifdef DEBUG 779 printf("sigreturn: cs = 0x%x\n", scp->sc_cs); 780#endif 781 trapsignal(p, SIGBUS, T_PROTFLT); 782 return(EINVAL); 783 } 784 785 /* restore scratch registers */ 786 regs[tEAX] = scp->sc_eax; 787 regs[tEBX] = scp->sc_ebx; 788 regs[tECX] = scp->sc_ecx; 789 regs[tEDX] = scp->sc_edx; 790 regs[tESI] = scp->sc_esi; 791 regs[tEDI] = scp->sc_edi; 792 regs[tCS] = scp->sc_cs; 793 regs[tDS] = scp->sc_ds; 794 regs[tES] = scp->sc_es; 795 regs[tSS] = scp->sc_ss; 796 regs[tISP] = scp->sc_isp; 797 798 if (useracc((caddr_t)scp, sizeof (*scp), 0) == 0) 799 return(EINVAL); 800 801 if (scp->sc_onstack & 01) 802 p->p_sigacts->ps_sigstk.ss_flags |= SA_ONSTACK; 803 else 804 p->p_sigacts->ps_sigstk.ss_flags &= ~SA_ONSTACK; 805 p->p_sigmask = scp->sc_mask &~ 806 (sigmask(SIGKILL)|sigmask(SIGCONT)|sigmask(SIGSTOP)); 807 regs[tEBP] = scp->sc_fp; 808 regs[tESP] = scp->sc_sp; 809 regs[tEIP] = scp->sc_pc; 810 regs[tEFLAGS] = eflags; 811 return(EJUSTRETURN); 812} 813 814/* 815 * a simple function to make the system panic (and dump a vmcore) 816 * in a predictable fashion 817 */ 818void diediedie() 819{ 820 panic("because you said to!"); 821} 822 823int waittime = -1; 824struct pcb dumppcb; 825 826__dead void 827boot(arghowto) 828 int arghowto; 829{ 830 register long dummy; /* r12 is reserved */ 831 register int howto; /* r11 == how to boot */ 832 register int devtype; /* r10 == major of root dev */ 833 834 if (cold) { 835 printf("hit reset please"); 836 for(;;); 837 } 838 howto = arghowto; 839 if ((howto&RB_NOSYNC) == 0 && waittime < 0) { 840 register struct buf *bp; 841 int iter, nbusy; 842 843 waittime = 0; 844 printf("\nsyncing disks... "); 845 846 sync(&proc0, NULL, NULL); 847 848 for (iter = 0; iter < 20; iter++) { 849 nbusy = 0; 850 for (bp = &buf[nbuf]; --bp >= buf; ) { 851 if ((bp->b_flags & (B_BUSY|B_INVAL)) == B_BUSY) { 852 nbusy++; 853 } 854 } 855 if (nbusy == 0) 856 break; 857 printf("%d ", nbusy); 858 DELAY(40000 * iter); 859 } 860 if (nbusy) { 861 /* 862 * Failed to sync all blocks. Indicate this and don't 863 * unmount filesystems (thus forcing an fsck on reboot). 864 */ 865 printf("giving up\n"); 866 } else { 867 printf("done\n"); 868 /* 869 * Unmount filesystems 870 */ 871 if (panicstr == 0) 872 vfs_unmountall(); 873 } 874 DELAY(100000); /* wait for console output to finish */ 875 dev_shutdownall(FALSE); 876 } 877 splhigh(); 878 devtype = major(rootdev); 879 if (howto&RB_HALT) { 880 printf("\n"); 881 printf("The operating system has halted.\n"); 882 printf("Please press any key to reboot.\n\n"); 883 cngetc(); 884 } else { 885 if (howto & RB_DUMP) { 886 savectx(&dumppcb, 0); 887 dumppcb.pcb_ptd = rcr3(); 888 dumpsys(); 889 890 if (PANIC_REBOOT_WAIT_TIME != 0) { 891 if (PANIC_REBOOT_WAIT_TIME != -1) { 892 int loop; 893 printf("Automatic reboot in %d seconds - press a key on the console to abort\n", 894 PANIC_REBOOT_WAIT_TIME); 895 for (loop = PANIC_REBOOT_WAIT_TIME; loop > 0; --loop) { 896 DELAY(1000 * 1000); /* one second */ 897 if (cncheckc()) /* Did user type a key? */ 898 break; 899 } 900 if (!loop) 901 goto die; 902 } 903 } else { /* zero time specified - reboot NOW */ 904 goto die; 905 } 906 printf("--> Press a key on the console to reboot <--\n"); 907 cngetc(); 908 } 909 } 910#ifdef lint 911 dummy = 0; dummy = dummy; 912 printf("howto %d, devtype %d\n", arghowto, devtype); 913#endif 914die: 915 printf("Rebooting...\n"); 916 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 917 cpu_reset(); 918 for(;;) ; 919 /* NOTREACHED */ 920} 921 922unsigned long dumpmag = 0x8fca0101UL; /* magic number for savecore */ 923int dumpsize = 0; /* also for savecore */ 924 925int dodump = 1; 926 927/* 928 * Doadump comes here after turning off memory management and 929 * getting on the dump stack, either when called above, or by 930 * the auto-restart code. 931 */ 932void 933dumpsys() 934{ 935 936 if (!dodump) 937 return; 938 if (dumpdev == NODEV) 939 return; 940 if ((minor(dumpdev)&07) != 1) 941 return; 942 dumpsize = Maxmem; 943 printf("\ndumping to dev %lx, offset %ld\n", dumpdev, dumplo); 944 printf("dump "); 945 switch ((*bdevsw[major(dumpdev)].d_dump)(dumpdev)) { 946 947 case ENXIO: 948 printf("device bad\n"); 949 break; 950 951 case EFAULT: 952 printf("device not ready\n"); 953 break; 954 955 case EINVAL: 956 printf("area improper\n"); 957 break; 958 959 case EIO: 960 printf("i/o error\n"); 961 break; 962 963 case EINTR: 964 printf("aborted from console\n"); 965 break; 966 967 default: 968 printf("succeeded\n"); 969 break; 970 } 971} 972 973static void 974initcpu() 975{ 976} 977 978/* 979 * Clear registers on exec 980 */ 981void 982setregs(p, entry, stack) 983 struct proc *p; 984 u_long entry; 985 u_long stack; 986{ 987 int *regs = p->p_md.md_regs; 988 989 bzero(regs, sizeof(struct trapframe)); 990 regs[tEIP] = entry; 991 regs[tESP] = stack; 992 regs[tEFLAGS] = PSL_USER | (regs[tEFLAGS] & PSL_T); 993 regs[tSS] = _udatasel; 994 regs[tDS] = _udatasel; 995 regs[tES] = _udatasel; 996 regs[tCS] = _ucodesel; 997 998 p->p_addr->u_pcb.pcb_flags = 0; /* no fp at all */ 999 load_cr0(rcr0() | CR0_TS); /* start emulating */ 1000#if NNPX > 0 1001 npxinit(__INITIAL_NPXCW__); 1002#endif /* NNPX > 0 */ 1003} 1004 1005/* 1006 * machine dependent system variables. 1007 */ 1008int 1009cpu_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 1010 int *name; 1011 u_int namelen; 1012 void *oldp; 1013 size_t *oldlenp; 1014 void *newp; 1015 size_t newlen; 1016 struct proc *p; 1017{ 1018 dev_t consdev; 1019 int error; 1020 1021 /* all sysctl names at this level are terminal */ 1022 if (namelen != 1) 1023 return (ENOTDIR); /* overloaded */ 1024 1025 switch (name[0]) { 1026 case CPU_CONSDEV: 1027 consdev = (cn_tty == NULL ? NODEV : cn_tty->t_dev); 1028 return (sysctl_rdstruct(oldp, oldlenp, newp, &consdev, 1029 sizeof consdev)); 1030 case CPU_ADJKERNTZ: 1031 error = sysctl_int(oldp, oldlenp, newp, newlen, &adjkerntz); 1032 if (!error && newp) 1033 resettodr(); 1034 return error; 1035 case CPU_DISRTCSET: 1036 return (sysctl_int(oldp, oldlenp, newp, newlen, &disable_rtc_set)); 1037 case CPU_BOOTINFO: 1038 return (sysctl_rdstruct(oldp, oldlenp, newp, &bootinfo, 1039 sizeof bootinfo)); 1040 default: 1041 return (EOPNOTSUPP); 1042 } 1043 /* NOTREACHED */ 1044} 1045 1046/* 1047 * Initialize 386 and configure to run kernel 1048 */ 1049 1050/* 1051 * Initialize segments & interrupt table 1052 */ 1053 1054int currentldt; 1055int _default_ldt; 1056union descriptor gdt[NGDT]; /* global descriptor table */ 1057struct gate_descriptor idt[NIDT]; /* interrupt descriptor table */ 1058union descriptor ldt[NLDT]; /* local descriptor table */ 1059 1060struct i386tss tss, panic_tss; 1061 1062extern struct user *proc0paddr; 1063 1064/* software prototypes -- in more palatable form */ 1065struct soft_segment_descriptor gdt_segs[] = { 1066/* GNULL_SEL 0 Null Descriptor */ 1067{ 0x0, /* segment base address */ 1068 0x0, /* length */ 1069 0, /* segment type */ 1070 0, /* segment descriptor priority level */ 1071 0, /* segment descriptor present */ 1072 0, 0, 1073 0, /* default 32 vs 16 bit size */ 1074 0 /* limit granularity (byte/page units)*/ }, 1075/* GCODE_SEL 1 Code Descriptor for kernel */ 1076{ 0x0, /* segment base address */ 1077 0xfffff, /* length - all address space */ 1078 SDT_MEMERA, /* segment type */ 1079 0, /* segment descriptor priority level */ 1080 1, /* segment descriptor present */ 1081 0, 0, 1082 1, /* default 32 vs 16 bit size */ 1083 1 /* limit granularity (byte/page units)*/ }, 1084/* GDATA_SEL 2 Data Descriptor for kernel */ 1085{ 0x0, /* segment base address */ 1086 0xfffff, /* length - all address space */ 1087 SDT_MEMRWA, /* segment type */ 1088 0, /* segment descriptor priority level */ 1089 1, /* segment descriptor present */ 1090 0, 0, 1091 1, /* default 32 vs 16 bit size */ 1092 1 /* limit granularity (byte/page units)*/ }, 1093/* GLDT_SEL 3 LDT Descriptor */ 1094{ (int) ldt, /* segment base address */ 1095 sizeof(ldt)-1, /* length - all address space */ 1096 SDT_SYSLDT, /* segment type */ 1097 0, /* segment descriptor priority level */ 1098 1, /* segment descriptor present */ 1099 0, 0, 1100 0, /* unused - default 32 vs 16 bit size */ 1101 0 /* limit granularity (byte/page units)*/ }, 1102/* GTGATE_SEL 4 Null Descriptor - Placeholder */ 1103{ 0x0, /* segment base address */ 1104 0x0, /* length - all address space */ 1105 0, /* segment type */ 1106 0, /* segment descriptor priority level */ 1107 0, /* segment descriptor present */ 1108 0, 0, 1109 0, /* default 32 vs 16 bit size */ 1110 0 /* limit granularity (byte/page units)*/ }, 1111/* GPANIC_SEL 5 Panic Tss Descriptor */ 1112{ (int) &panic_tss, /* segment base address */ 1113 sizeof(tss)-1, /* length - all address space */ 1114 SDT_SYS386TSS, /* segment type */ 1115 0, /* segment descriptor priority level */ 1116 1, /* segment descriptor present */ 1117 0, 0, 1118 0, /* unused - default 32 vs 16 bit size */ 1119 0 /* limit granularity (byte/page units)*/ }, 1120/* GPROC0_SEL 6 Proc 0 Tss Descriptor */ 1121{ (int) kstack, /* segment base address */ 1122 sizeof(tss)-1, /* length - all address space */ 1123 SDT_SYS386TSS, /* segment type */ 1124 0, /* segment descriptor priority level */ 1125 1, /* segment descriptor present */ 1126 0, 0, 1127 0, /* unused - default 32 vs 16 bit size */ 1128 0 /* limit granularity (byte/page units)*/ }, 1129/* GUSERLDT_SEL 7 User LDT Descriptor per process */ 1130{ (int) ldt, /* segment base address */ 1131 (512 * sizeof(union descriptor)-1), /* length */ 1132 SDT_SYSLDT, /* segment type */ 1133 0, /* segment descriptor priority level */ 1134 1, /* segment descriptor present */ 1135 0, 0, 1136 0, /* unused - default 32 vs 16 bit size */ 1137 0 /* limit granularity (byte/page units)*/ }, 1138/* GAPMCODE32_SEL 8 APM BIOS 32-bit interface (32bit Code) */ 1139{ 0, /* segment base address (overwritten by APM) */ 1140 0xfffff, /* length */ 1141 SDT_MEMERA, /* segment type */ 1142 0, /* segment descriptor priority level */ 1143 1, /* segment descriptor present */ 1144 0, 0, 1145 1, /* default 32 vs 16 bit size */ 1146 1 /* limit granularity (byte/page units)*/ }, 1147/* GAPMCODE16_SEL 9 APM BIOS 32-bit interface (16bit Code) */ 1148{ 0, /* segment base address (overwritten by APM) */ 1149 0xfffff, /* length */ 1150 SDT_MEMERA, /* segment type */ 1151 0, /* segment descriptor priority level */ 1152 1, /* segment descriptor present */ 1153 0, 0, 1154 0, /* default 32 vs 16 bit size */ 1155 1 /* limit granularity (byte/page units)*/ }, 1156/* GAPMDATA_SEL 10 APM BIOS 32-bit interface (Data) */ 1157{ 0, /* segment base address (overwritten by APM) */ 1158 0xfffff, /* length */ 1159 SDT_MEMRWA, /* segment type */ 1160 0, /* segment descriptor priority level */ 1161 1, /* segment descriptor present */ 1162 0, 0, 1163 1, /* default 32 vs 16 bit size */ 1164 1 /* limit granularity (byte/page units)*/ }, 1165}; 1166 1167struct soft_segment_descriptor ldt_segs[] = { 1168 /* Null Descriptor - overwritten by call gate */ 1169{ 0x0, /* segment base address */ 1170 0x0, /* length - all address space */ 1171 0, /* segment type */ 1172 0, /* segment descriptor priority level */ 1173 0, /* segment descriptor present */ 1174 0, 0, 1175 0, /* default 32 vs 16 bit size */ 1176 0 /* limit granularity (byte/page units)*/ }, 1177 /* Null Descriptor - overwritten by call gate */ 1178{ 0x0, /* segment base address */ 1179 0x0, /* length - all address space */ 1180 0, /* segment type */ 1181 0, /* segment descriptor priority level */ 1182 0, /* segment descriptor present */ 1183 0, 0, 1184 0, /* default 32 vs 16 bit size */ 1185 0 /* limit granularity (byte/page units)*/ }, 1186 /* Null Descriptor - overwritten by call gate */ 1187{ 0x0, /* segment base address */ 1188 0x0, /* length - all address space */ 1189 0, /* segment type */ 1190 0, /* segment descriptor priority level */ 1191 0, /* segment descriptor present */ 1192 0, 0, 1193 0, /* default 32 vs 16 bit size */ 1194 0 /* limit granularity (byte/page units)*/ }, 1195 /* Code Descriptor for user */ 1196{ 0x0, /* segment base address */ 1197 0xfffff, /* length - all address space */ 1198 SDT_MEMERA, /* segment type */ 1199 SEL_UPL, /* segment descriptor priority level */ 1200 1, /* segment descriptor present */ 1201 0, 0, 1202 1, /* default 32 vs 16 bit size */ 1203 1 /* limit granularity (byte/page units)*/ }, 1204 /* Data Descriptor for user */ 1205{ 0x0, /* segment base address */ 1206 0xfffff, /* length - all address space */ 1207 SDT_MEMRWA, /* segment type */ 1208 SEL_UPL, /* segment descriptor priority level */ 1209 1, /* segment descriptor present */ 1210 0, 0, 1211 1, /* default 32 vs 16 bit size */ 1212 1 /* limit granularity (byte/page units)*/ }, 1213}; 1214 1215void 1216setidt(idx, func, typ, dpl) 1217 int idx; 1218 inthand_t *func; 1219 int typ; 1220 int dpl; 1221{ 1222 struct gate_descriptor *ip = idt + idx; 1223 1224 ip->gd_looffset = (int)func; 1225 ip->gd_selector = 8; 1226 ip->gd_stkcpy = 0; 1227 ip->gd_xx = 0; 1228 ip->gd_type = typ; 1229 ip->gd_dpl = dpl; 1230 ip->gd_p = 1; 1231 ip->gd_hioffset = ((int)func)>>16 ; 1232} 1233 1234#define IDTVEC(name) __CONCAT(X,name) 1235 1236extern inthand_t 1237 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 1238 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(dble), IDTVEC(fpusegm), 1239 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 1240 IDTVEC(page), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 1241 IDTVEC(syscall); 1242 1243#ifdef COMPAT_LINUX 1244extern inthand_t 1245 IDTVEC(linux_syscall); 1246#endif 1247 1248void 1249sdtossd(sd, ssd) 1250 struct segment_descriptor *sd; 1251 struct soft_segment_descriptor *ssd; 1252{ 1253 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 1254 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 1255 ssd->ssd_type = sd->sd_type; 1256 ssd->ssd_dpl = sd->sd_dpl; 1257 ssd->ssd_p = sd->sd_p; 1258 ssd->ssd_def32 = sd->sd_def32; 1259 ssd->ssd_gran = sd->sd_gran; 1260} 1261 1262void 1263init386(first) 1264 int first; 1265{ 1266 int x; 1267 unsigned biosbasemem, biosextmem; 1268 struct gate_descriptor *gdp; 1269 int gsel_tss; 1270 /* table descriptors - used to load tables by microp */ 1271 struct region_descriptor r_gdt, r_idt; 1272 int pagesinbase, pagesinext; 1273 int target_page, pa_indx; 1274 1275 proc0.p_addr = proc0paddr; 1276 1277 /* 1278 * Initialize the console before we print anything out. 1279 */ 1280 1281 cninit (); 1282 1283 /* 1284 * make gdt memory segments, the code segment goes up to end of the 1285 * page with etext in it, the data segment goes to the end of 1286 * the address space 1287 */ 1288 /* 1289 * XXX text protection is temporarily (?) disabled. The limit was 1290 * i386_btop(i386_round_page(etext)) - 1. 1291 */ 1292 gdt_segs[GCODE_SEL].ssd_limit = i386_btop(0) - 1; 1293 gdt_segs[GDATA_SEL].ssd_limit = i386_btop(0) - 1; 1294 for (x = 0; x < NGDT; x++) 1295 ssdtosd(&gdt_segs[x], &gdt[x].sd); 1296 1297 /* make ldt memory segments */ 1298 /* 1299 * The data segment limit must not cover the user area because we 1300 * don't want the user area to be writable in copyout() etc. (page 1301 * level protection is lost in kernel mode on 386's). Also, we 1302 * don't want the user area to be writable directly (page level 1303 * protection of the user area is not available on 486's with 1304 * CR0_WP set, because there is no user-read/kernel-write mode). 1305 * 1306 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it 1307 * should be spelled ...MAX_USER... 1308 */ 1309#define VM_END_USER_RW_ADDRESS VM_MAXUSER_ADDRESS 1310 /* 1311 * The code segment limit has to cover the user area until we move 1312 * the signal trampoline out of the user area. This is safe because 1313 * the code segment cannot be written to directly. 1314 */ 1315#define VM_END_USER_R_ADDRESS (VM_END_USER_RW_ADDRESS + UPAGES * NBPG) 1316 ldt_segs[LUCODE_SEL].ssd_limit = i386_btop(VM_END_USER_R_ADDRESS) - 1; 1317 ldt_segs[LUDATA_SEL].ssd_limit = i386_btop(VM_END_USER_RW_ADDRESS) - 1; 1318 /* Note. eventually want private ldts per process */ 1319 for (x = 0; x < NLDT; x++) 1320 ssdtosd(&ldt_segs[x], &ldt[x].sd); 1321 1322 /* exceptions */ 1323 for (x = 0; x < NIDT; x++) 1324 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL); 1325 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL); 1326 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL); 1327 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL); 1328 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL); 1329 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL); 1330 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL); 1331 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL); 1332 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL); 1333 setidt(8, &IDTVEC(dble), SDT_SYS386TGT, SEL_KPL); 1334 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL); 1335 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL); 1336 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL); 1337 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL); 1338 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL); 1339 setidt(14, &IDTVEC(page), SDT_SYS386TGT, SEL_KPL); 1340 setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL); 1341 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL); 1342 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL); 1343#ifdef COMPAT_LINUX 1344 setidt(0x80, &IDTVEC(linux_syscall), SDT_SYS386TGT, SEL_UPL); 1345#endif 1346 1347#include "isa.h" 1348#if NISA >0 1349 isa_defaultirq(); 1350#endif 1351 1352 r_gdt.rd_limit = sizeof(gdt) - 1; 1353 r_gdt.rd_base = (int) gdt; 1354 lgdt(&r_gdt); 1355 1356 r_idt.rd_limit = sizeof(idt) - 1; 1357 r_idt.rd_base = (int) idt; 1358 lidt(&r_idt); 1359 1360 _default_ldt = GSEL(GLDT_SEL, SEL_KPL); 1361 lldt(_default_ldt); 1362 currentldt = _default_ldt; 1363 1364#ifdef DDB 1365 kdb_init(); 1366 if (boothowto & RB_KDB) 1367 Debugger("Boot flags requested debugger"); 1368#endif 1369 1370 /* Use BIOS values stored in RTC CMOS RAM, since probing 1371 * breaks certain 386 AT relics. 1372 */ 1373 biosbasemem = rtcin(RTC_BASELO)+ (rtcin(RTC_BASEHI)<<8); 1374 biosextmem = rtcin(RTC_EXTLO)+ (rtcin(RTC_EXTHI)<<8); 1375 1376 /* 1377 * Print a warning if the official BIOS interface disagrees 1378 * with the hackish interface used above. Eventually only 1379 * the official interface should be used. 1380 */ 1381 if (bootinfo.bi_memsizes_valid) { 1382 if (bootinfo.bi_basemem != biosbasemem) 1383 printf("BIOS basemem (%ldK) != RTC basemem (%dK)\n", 1384 bootinfo.bi_basemem, biosbasemem); 1385 if (bootinfo.bi_extmem != biosextmem) 1386 printf("BIOS extmem (%ldK) != RTC extmem (%dK)\n", 1387 bootinfo.bi_extmem, biosextmem); 1388 } 1389 1390 /* 1391 * If BIOS tells us that it has more than 640k in the basemem, 1392 * don't believe it - set it to 640k. 1393 */ 1394 if (biosbasemem > 640) 1395 biosbasemem = 640; 1396 1397 /* 1398 * Some 386 machines might give us a bogus number for extended 1399 * mem. If this happens, stop now. 1400 */ 1401#ifndef LARGEMEM 1402 if (biosextmem > 65536) { 1403 panic("extended memory beyond limit of 64MB"); 1404 /* NOTREACHED */ 1405 } 1406#endif 1407 1408 pagesinbase = biosbasemem * 1024 / NBPG; 1409 pagesinext = biosextmem * 1024 / NBPG; 1410 1411 /* 1412 * Special hack for chipsets that still remap the 384k hole when 1413 * there's 16MB of memory - this really confuses people that 1414 * are trying to use bus mastering ISA controllers with the 1415 * "16MB limit"; they only have 16MB, but the remapping puts 1416 * them beyond the limit. 1417 */ 1418 /* 1419 * If extended memory is between 15-16MB (16-17MB phys address range), 1420 * chop it to 15MB. 1421 */ 1422 if ((pagesinext > 3840) && (pagesinext < 4096)) 1423 pagesinext = 3840; 1424 1425 /* 1426 * Maxmem isn't the "maximum memory", it's one larger than the 1427 * highest page of of the physical address space. It 1428 */ 1429 Maxmem = pagesinext + 0x100000/PAGE_SIZE; 1430 1431#ifdef MAXMEM 1432 Maxmem = MAXMEM/4; 1433#endif 1434 1435 /* call pmap initialization to make new kernel address space */ 1436 pmap_bootstrap (first, 0); 1437 1438 /* 1439 * Size up each available chunk of physical memory. 1440 */ 1441 1442 /* 1443 * We currently don't bother testing base memory. 1444 * XXX ...but we probably should. 1445 */ 1446 pa_indx = 0; 1447 badpages = 0; 1448 if (pagesinbase > 1) { 1449 phys_avail[pa_indx++] = PAGE_SIZE; /* skip first page of memory */ 1450 phys_avail[pa_indx] = ptoa(pagesinbase);/* memory up to the ISA hole */ 1451 physmem = pagesinbase - 1; 1452 } else { 1453 /* point at first chunk end */ 1454 pa_indx++; 1455 } 1456 1457 for (target_page = first; target_page < ptoa(Maxmem); target_page += PAGE_SIZE) { 1458 int tmp, page_bad = FALSE; 1459 1460 /* 1461 * map page into kernel: valid, read/write, non-cacheable 1462 */ 1463 *(int *)CMAP1 = PG_V | PG_KW | PG_N | target_page; 1464 pmap_update(); 1465 1466 tmp = *(int *)CADDR1; 1467 /* 1468 * Test for alternating 1's and 0's 1469 */ 1470 *(int *)CADDR1 = 0xaaaaaaaa; 1471 if (*(int *)CADDR1 != 0xaaaaaaaa) { 1472 page_bad = TRUE; 1473 } 1474 /* 1475 * Test for alternating 0's and 1's 1476 */ 1477 *(int *)CADDR1 = 0x55555555; 1478 if (*(int *)CADDR1 != 0x55555555) { 1479 page_bad = TRUE; 1480 } 1481 /* 1482 * Test for all 1's 1483 */ 1484 *(int *)CADDR1 = 0xffffffff; 1485 if (*(int *)CADDR1 != 0xffffffff) { 1486 page_bad = TRUE; 1487 } 1488 /* 1489 * Test for all 0's 1490 */ 1491 *(int *)CADDR1 = 0x0; 1492 if (*(int *)CADDR1 != 0x0) { 1493 /* 1494 * test of page failed 1495 */ 1496 page_bad = TRUE; 1497 } 1498 /* 1499 * Restore original value. 1500 */ 1501 *(int *)CADDR1 = tmp; 1502 1503 /* 1504 * Adjust array of valid/good pages. 1505 */ 1506 if (page_bad == FALSE) { 1507 /* 1508 * If this good page is a continuation of the 1509 * previous set of good pages, then just increase 1510 * the end pointer. Otherwise start a new chunk. 1511 * Note that "end" points one higher than end, 1512 * making the range >= start and < end. 1513 */ 1514 if (phys_avail[pa_indx] == target_page) { 1515 phys_avail[pa_indx] += PAGE_SIZE; 1516 } else { 1517 pa_indx++; 1518 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 1519 printf("Too many holes in the physical address space, giving up\n"); 1520 pa_indx--; 1521 break; 1522 } 1523 phys_avail[pa_indx++] = target_page; /* start */ 1524 phys_avail[pa_indx] = target_page + PAGE_SIZE; /* end */ 1525 } 1526 physmem++; 1527 } else { 1528 badpages++; 1529 page_bad = FALSE; 1530 } 1531 } 1532 1533 *(int *)CMAP1 = 0; 1534 pmap_update(); 1535 1536 /* 1537 * XXX 1538 * The last chunk must contain at leat one page plus the message 1539 * buffer to avoid complicating other code (message buffer address 1540 * calculation, etc.). 1541 */ 1542 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 1543 round_page(sizeof(struct msgbuf)) >= phys_avail[pa_indx]) { 1544 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 1545 phys_avail[pa_indx--] = 0; 1546 phys_avail[pa_indx--] = 0; 1547 } 1548 1549 Maxmem = atop(phys_avail[pa_indx]); 1550 1551 /* Trim off space for the message buffer. */ 1552 phys_avail[pa_indx] -= round_page(sizeof(struct msgbuf)); 1553 1554 avail_end = phys_avail[pa_indx]; 1555 1556 /* now running on new page tables, configured,and u/iom is accessible */ 1557 1558 /* make a initial tss so microp can get interrupt stack on syscall! */ 1559 proc0.p_addr->u_pcb.pcb_tss.tss_esp0 = (int) kstack + UPAGES*NBPG; 1560 proc0.p_addr->u_pcb.pcb_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ; 1561 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 1562 1563 ((struct i386tss *)gdt_segs[GPROC0_SEL].ssd_base)->tss_ioopt = 1564 (sizeof(tss))<<16; 1565 1566 ltr(gsel_tss); 1567 1568 /* make a call gate to reenter kernel with */ 1569 gdp = &ldt[LSYS5CALLS_SEL].gd; 1570 1571 x = (int) &IDTVEC(syscall); 1572 gdp->gd_looffset = x++; 1573 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL); 1574 gdp->gd_stkcpy = 1; 1575 gdp->gd_type = SDT_SYS386CGT; 1576 gdp->gd_dpl = SEL_UPL; 1577 gdp->gd_p = 1; 1578 gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16; 1579 1580 /* transfer to user mode */ 1581 1582 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL); 1583 _udatasel = LSEL(LUDATA_SEL, SEL_UPL); 1584 1585 /* setup proc 0's pcb */ 1586 bcopy(&sigcode, proc0.p_addr->u_pcb.pcb_sigc, szsigcode); 1587 proc0.p_addr->u_pcb.pcb_flags = 0; 1588 proc0.p_addr->u_pcb.pcb_ptd = IdlePTD; 1589} 1590 1591/* 1592 * The registers are in the frame; the frame is in the user area of 1593 * the process in question; when the process is active, the registers 1594 * are in "the kernel stack"; when it's not, they're still there, but 1595 * things get flipped around. So, since p->p_md.md_regs is the whole address 1596 * of the register set, take its offset from the kernel stack, and 1597 * index into the user block. Don't you just *love* virtual memory? 1598 * (I'm starting to think seymour is right...) 1599 */ 1600#define TF_REGP(p) ((struct trapframe *) \ 1601 ((char *)(p)->p_addr \ 1602 + ((char *)(p)->p_md.md_regs - kstack))) 1603 1604int 1605ptrace_set_pc(p, addr) 1606 struct proc *p; 1607 unsigned int addr; 1608{ 1609 TF_REGP(p)->tf_eip = addr; 1610 return (0); 1611} 1612 1613int 1614ptrace_single_step(p) 1615 struct proc *p; 1616{ 1617 TF_REGP(p)->tf_eflags |= PSL_T; 1618 return (0); 1619} 1620 1621int 1622ptrace_getregs(p, addr) 1623 struct proc *p; 1624 unsigned int *addr; 1625{ 1626 int error; 1627 struct reg regs; 1628 1629 error = fill_regs(p, ®s); 1630 if (error) 1631 return (error); 1632 return (copyout(®s, addr, sizeof regs)); 1633} 1634 1635int 1636ptrace_setregs(p, addr) 1637 struct proc *p; 1638 unsigned int *addr; 1639{ 1640 int error; 1641 struct reg regs; 1642 1643 error = copyin(addr, ®s, sizeof regs); 1644 if (error) 1645 return (error); 1646 return (set_regs(p, ®s)); 1647} 1648 1649int ptrace_write_u(p, off, data) 1650 struct proc *p; 1651 vm_offset_t off; 1652 int data; 1653{ 1654 struct trapframe frame_copy; 1655 vm_offset_t min; 1656 struct trapframe *tp; 1657 1658 /* 1659 * Privileged kernel state is scattered all over the user area. 1660 * Only allow write access to parts of regs and to fpregs. 1661 */ 1662 min = (char *)p->p_md.md_regs - kstack; 1663 if (off >= min && off <= min + sizeof(struct trapframe) - sizeof(int)) { 1664 tp = TF_REGP(p); 1665 frame_copy = *tp; 1666 *(int *)((char *)&frame_copy + (off - min)) = data; 1667 if (!EFLAGS_SECURE(frame_copy.tf_eflags, tp->tf_eflags) || 1668 !CS_SECURE(frame_copy.tf_cs)) 1669 return (EINVAL); 1670 *(int*)((char *)p->p_addr + off) = data; 1671 return (0); 1672 } 1673 min = offsetof(struct user, u_pcb) + offsetof(struct pcb, pcb_savefpu); 1674 if (off >= min && off <= min + sizeof(struct save87) - sizeof(int)) { 1675 *(int*)((char *)p->p_addr + off) = data; 1676 return (0); 1677 } 1678 return (EFAULT); 1679} 1680 1681int 1682fill_regs(p, regs) 1683 struct proc *p; 1684 struct reg *regs; 1685{ 1686 struct trapframe *tp; 1687 1688 tp = TF_REGP(p); 1689 regs->r_es = tp->tf_es; 1690 regs->r_ds = tp->tf_ds; 1691 regs->r_edi = tp->tf_edi; 1692 regs->r_esi = tp->tf_esi; 1693 regs->r_ebp = tp->tf_ebp; 1694 regs->r_ebx = tp->tf_ebx; 1695 regs->r_edx = tp->tf_edx; 1696 regs->r_ecx = tp->tf_ecx; 1697 regs->r_eax = tp->tf_eax; 1698 regs->r_eip = tp->tf_eip; 1699 regs->r_cs = tp->tf_cs; 1700 regs->r_eflags = tp->tf_eflags; 1701 regs->r_esp = tp->tf_esp; 1702 regs->r_ss = tp->tf_ss; 1703 return (0); 1704} 1705 1706int 1707set_regs(p, regs) 1708 struct proc *p; 1709 struct reg *regs; 1710{ 1711 struct trapframe *tp; 1712 1713 tp = TF_REGP(p); 1714 if (!EFLAGS_SECURE(regs->r_eflags, tp->tf_eflags) || 1715 !CS_SECURE(regs->r_cs)) 1716 return (EINVAL); 1717 tp->tf_es = regs->r_es; 1718 tp->tf_ds = regs->r_ds; 1719 tp->tf_edi = regs->r_edi; 1720 tp->tf_esi = regs->r_esi; 1721 tp->tf_ebp = regs->r_ebp; 1722 tp->tf_ebx = regs->r_ebx; 1723 tp->tf_edx = regs->r_edx; 1724 tp->tf_ecx = regs->r_ecx; 1725 tp->tf_eax = regs->r_eax; 1726 tp->tf_eip = regs->r_eip; 1727 tp->tf_cs = regs->r_cs; 1728 tp->tf_eflags = regs->r_eflags; 1729 tp->tf_esp = regs->r_esp; 1730 tp->tf_ss = regs->r_ss; 1731 return (0); 1732} 1733 1734#ifndef DDB 1735void 1736Debugger(const char *msg) 1737{ 1738 printf("Debugger(\"%s\") called.\n", msg); 1739} 1740#endif /* no DDB */ 1741 1742#include <sys/disklabel.h> 1743#define b_cylin b_resid 1744/* 1745 * Determine the size of the transfer, and make sure it is 1746 * within the boundaries of the partition. Adjust transfer 1747 * if needed, and signal errors or early completion. 1748 */ 1749int 1750bounds_check_with_label(struct buf *bp, struct disklabel *lp, int wlabel) 1751{ 1752 struct partition *p = lp->d_partitions + dkpart(bp->b_dev); 1753 int labelsect = lp->d_partitions[0].p_offset; 1754 int maxsz = p->p_size, 1755 sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT; 1756 1757 /* overwriting disk label ? */ 1758 /* XXX should also protect bootstrap in first 8K */ 1759 if (bp->b_blkno + p->p_offset <= LABELSECTOR + labelsect && 1760#if LABELSECTOR != 0 1761 bp->b_blkno + p->p_offset + sz > LABELSECTOR + labelsect && 1762#endif 1763 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 1764 bp->b_error = EROFS; 1765 goto bad; 1766 } 1767 1768#if defined(DOSBBSECTOR) && defined(notyet) 1769 /* overwriting master boot record? */ 1770 if (bp->b_blkno + p->p_offset <= DOSBBSECTOR && 1771 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 1772 bp->b_error = EROFS; 1773 goto bad; 1774 } 1775#endif 1776 1777 /* beyond partition? */ 1778 if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz) { 1779 /* if exactly at end of disk, return an EOF */ 1780 if (bp->b_blkno == maxsz) { 1781 bp->b_resid = bp->b_bcount; 1782 return(0); 1783 } 1784 /* or truncate if part of it fits */ 1785 sz = maxsz - bp->b_blkno; 1786 if (sz <= 0) { 1787 bp->b_error = EINVAL; 1788 goto bad; 1789 } 1790 bp->b_bcount = sz << DEV_BSHIFT; 1791 } 1792 1793 /* calculate cylinder for disksort to order transfers with */ 1794 bp->b_pblkno = bp->b_blkno + p->p_offset; 1795 bp->b_cylin = bp->b_pblkno / lp->d_secpercyl; 1796 return(1); 1797 1798bad: 1799 bp->b_flags |= B_ERROR; 1800 return(-1); 1801} 1802 1803int 1804disk_externalize(int drive, void *userp, size_t *maxlen) 1805{ 1806 if(*maxlen < sizeof drive) { 1807 return ENOMEM; 1808 } 1809 1810 *maxlen -= sizeof drive; 1811 return copyout(&drive, userp, sizeof drive); 1812} 1813