machdep.c revision 12929
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 1.160 1995/12/16 18:52:08 peter 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/sysproto.h> 47#include <sys/signalvar.h> 48#include <sys/kernel.h> 49#include <sys/proc.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#include <sys/vmmeter.h> 65 66#ifdef SYSVSHM 67#include <sys/shm.h> 68#endif 69 70#ifdef SYSVMSG 71#include <sys/msg.h> 72#endif 73 74#ifdef SYSVSEM 75#include <sys/sem.h> 76#endif 77 78#include <vm/vm.h> 79#include <vm/vm_param.h> 80#include <vm/vm_prot.h> 81#include <vm/lock.h> 82#include <vm/vm_kern.h> 83#include <vm/vm_object.h> 84#include <vm/vm_page.h> 85#include <vm/vm_map.h> 86#include <vm/vm_pager.h> 87#include <vm/vm_extern.h> 88 89#include <sys/user.h> 90#include <sys/exec.h> 91#include <sys/vnode.h> 92 93#include <ddb/ddb.h> 94 95#include <net/netisr.h> 96 97#include <machine/cpu.h> 98#include <machine/npx.h> 99#include <machine/reg.h> 100#include <machine/psl.h> 101#include <machine/clock.h> 102#include <machine/specialreg.h> 103#include <machine/sysarch.h> 104#include <machine/cons.h> 105#include <machine/devconf.h> 106#include <machine/bootinfo.h> 107#include <machine/md_var.h> 108 109#include <i386/isa/isa.h> 110#include <i386/isa/isa_device.h> 111#include <i386/isa/rtc.h> 112#include <machine/random.h> 113 114extern void init386 __P((int first)); 115extern int ptrace_set_pc __P((struct proc *p, unsigned int addr)); 116extern int ptrace_single_step __P((struct proc *p)); 117extern int ptrace_write_u __P((struct proc *p, vm_offset_t off, int data)); 118extern void dblfault_handler __P((void)); 119 120static void cpu_startup __P((void *)); 121SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL) 122 123static void identifycpu(void); 124 125char machine[] = "i386"; 126SYSCTL_STRING(_hw, HW_MACHINE, machine, CTLFLAG_RD, machine, 0, ""); 127 128static char cpu_model[128]; 129SYSCTL_STRING(_hw, HW_MODEL, model, CTLFLAG_RD, cpu_model, 0, ""); 130 131struct kern_devconf kdc_cpu0 = { 132 0, 0, 0, /* filled in by dev_attach */ 133 "cpu", 0, { MDDT_CPU }, 134 0, 0, 0, CPU_EXTERNALLEN, 135 0, /* CPU has no parent */ 136 0, /* no parentdata */ 137 DC_BUSY, /* the CPU is always busy */ 138 cpu_model, /* no sense in duplication */ 139 DC_CLS_CPU /* class */ 140}; 141 142#ifndef PANIC_REBOOT_WAIT_TIME 143#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 144#endif 145 146#ifdef BOUNCE_BUFFERS 147extern char *bouncememory; 148extern int maxbkva; 149#ifdef BOUNCEPAGES 150int bouncepages = BOUNCEPAGES; 151#else 152int bouncepages = 0; 153#endif 154#endif /* BOUNCE_BUFFERS */ 155 156extern int freebufspace; 157int msgbufmapped = 0; /* set when safe to use msgbuf */ 158int _udatasel, _ucodesel; 159 160 161int physmem = 0; 162 163static int 164sysctl_hw_physmem SYSCTL_HANDLER_ARGS 165{ 166 int error = sysctl_handle_int(oidp, 0, ctob(physmem), req); 167 return (error); 168} 169 170SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_INT|CTLFLAG_RD, 171 0, 0, sysctl_hw_physmem, "I", ""); 172 173static int 174sysctl_hw_usermem SYSCTL_HANDLER_ARGS 175{ 176 int error = sysctl_handle_int(oidp, 0, 177 ctob(physmem - cnt.v_wire_count), req); 178 return (error); 179} 180 181SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD, 182 0, 0, sysctl_hw_usermem, "I", ""); 183 184int boothowto = 0, bootverbose = 0, Maxmem = 0; 185static int badpages = 0; 186long dumplo; 187extern int bootdev; 188 189vm_offset_t phys_avail[10]; 190 191/* must be 2 less so 0 0 can signal end of chunks */ 192#define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(vm_offset_t)) - 2) 193 194int cpu_class; 195 196static void dumpsys __P((void)); 197static void setup_netisrs __P((struct linker_set *)); /* XXX declare elsewhere */ 198 199static vm_offset_t buffer_sva, buffer_eva; 200vm_offset_t clean_sva, clean_eva; 201static vm_offset_t pager_sva, pager_eva; 202extern struct linker_set netisr_set; 203 204#define offsetof(type, member) ((size_t)(&((type *)0)->member)) 205 206static void 207cpu_startup(dummy) 208 void *dummy; 209{ 210 register unsigned i; 211 register caddr_t v; 212 vm_offset_t maxaddr; 213 vm_size_t size = 0; 214 int firstaddr; 215 vm_offset_t minaddr; 216 217 if (boothowto & RB_VERBOSE) 218 bootverbose++; 219 220 /* 221 * Initialize error message buffer (at end of core). 222 */ 223 224 /* avail_end was pre-decremented in init_386() to compensate */ 225 for (i = 0; i < btoc(sizeof (struct msgbuf)); i++) 226 pmap_enter(pmap_kernel(), (vm_offset_t)msgbufp, 227 avail_end + i * NBPG, 228 VM_PROT_ALL, TRUE); 229 msgbufmapped = 1; 230 231 /* 232 * Good {morning,afternoon,evening,night}. 233 */ 234 printf(version); 235 startrtclock(); 236 identifycpu(); 237 printf("real memory = %d (%dK bytes)\n", ptoa(Maxmem), ptoa(Maxmem) / 1024); 238 /* 239 * Display any holes after the first chunk of extended memory. 240 */ 241 if (badpages != 0) { 242 int indx = 1; 243 244 /* 245 * XXX skip reporting ISA hole & unmanaged kernel memory 246 */ 247 if (phys_avail[0] == PAGE_SIZE) 248 indx += 2; 249 250 printf("Physical memory hole(s):\n"); 251 for (; phys_avail[indx + 1] != 0; indx += 2) { 252 int size = phys_avail[indx + 1] - phys_avail[indx]; 253 254 printf("0x%08lx - 0x%08lx, %d bytes (%d pages)\n", phys_avail[indx], 255 phys_avail[indx + 1] - 1, size, size / PAGE_SIZE); 256 } 257 } 258 259 /* 260 * Quickly wire in netisrs. 261 */ 262 setup_netisrs(&netisr_set); 263 264/* 265#ifdef ISDN 266 DONET(isdnintr, NETISR_ISDN); 267#endif 268*/ 269 270 /* 271 * Allocate space for system data structures. 272 * The first available kernel virtual address is in "v". 273 * As pages of kernel virtual memory are allocated, "v" is incremented. 274 * As pages of memory are allocated and cleared, 275 * "firstaddr" is incremented. 276 * An index into the kernel page table corresponding to the 277 * virtual memory address maintained in "v" is kept in "mapaddr". 278 */ 279 280 /* 281 * Make two passes. The first pass calculates how much memory is 282 * needed and allocates it. The second pass assigns virtual 283 * addresses to the various data structures. 284 */ 285 firstaddr = 0; 286again: 287 v = (caddr_t)firstaddr; 288 289#define valloc(name, type, num) \ 290 (name) = (type *)v; v = (caddr_t)((name)+(num)) 291#define valloclim(name, type, num, lim) \ 292 (name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num))) 293 valloc(callout, struct callout, ncallout); 294#ifdef SYSVSHM 295 valloc(shmsegs, struct shmid_ds, shminfo.shmmni); 296#endif 297#ifdef SYSVSEM 298 valloc(sema, struct semid_ds, seminfo.semmni); 299 valloc(sem, struct sem, seminfo.semmns); 300 /* This is pretty disgusting! */ 301 valloc(semu, int, (seminfo.semmnu * seminfo.semusz) / sizeof(int)); 302#endif 303#ifdef SYSVMSG 304 valloc(msgpool, char, msginfo.msgmax); 305 valloc(msgmaps, struct msgmap, msginfo.msgseg); 306 valloc(msghdrs, struct msg, msginfo.msgtql); 307 valloc(msqids, struct msqid_ds, msginfo.msgmni); 308#endif 309 310 if (nbuf == 0) { 311 nbuf = 30; 312 if( physmem > 1024) 313 nbuf += min((physmem - 1024) / 12, 1024); 314 } 315 nswbuf = min(nbuf, 128); 316 317 valloc(swbuf, struct buf, nswbuf); 318 valloc(buf, struct buf, nbuf); 319 320#ifdef BOUNCE_BUFFERS 321 /* 322 * If there is more than 16MB of memory, allocate some bounce buffers 323 */ 324 if (Maxmem > 4096) { 325 if (bouncepages == 0) { 326 bouncepages = 64; 327 bouncepages += ((Maxmem - 4096) / 2048) * 32; 328 } 329 v = (caddr_t)((vm_offset_t)((vm_offset_t)v + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1)); 330 valloc(bouncememory, char, bouncepages * PAGE_SIZE); 331 } 332#endif 333 334 /* 335 * End of first pass, size has been calculated so allocate memory 336 */ 337 if (firstaddr == 0) { 338 size = (vm_size_t)(v - firstaddr); 339 firstaddr = (int)kmem_alloc(kernel_map, round_page(size)); 340 if (firstaddr == 0) 341 panic("startup: no room for tables"); 342 goto again; 343 } 344 345 /* 346 * End of second pass, addresses have been assigned 347 */ 348 if ((vm_size_t)(v - firstaddr) != size) 349 panic("startup: table size inconsistency"); 350 351#ifdef BOUNCE_BUFFERS 352 clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva, 353 (nbuf*MAXBSIZE) + (nswbuf*MAXPHYS) + 354 maxbkva + pager_map_size, TRUE); 355 io_map = kmem_suballoc(clean_map, &minaddr, &maxaddr, maxbkva, FALSE); 356#else 357 clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva, 358 (nbuf*MAXBSIZE) + (nswbuf*MAXPHYS) + pager_map_size, TRUE); 359#endif 360 buffer_map = kmem_suballoc(clean_map, &buffer_sva, &buffer_eva, 361 (nbuf*MAXBSIZE), TRUE); 362 pager_map = kmem_suballoc(clean_map, &pager_sva, &pager_eva, 363 (nswbuf*MAXPHYS) + pager_map_size, TRUE); 364 exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, 365 (16*ARG_MAX), TRUE); 366 u_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, 367 (maxproc*UPAGES*PAGE_SIZE), FALSE); 368 369 /* 370 * Finally, allocate mbuf pool. Since mclrefcnt is an off-size 371 * we use the more space efficient malloc in place of kmem_alloc. 372 */ 373 mclrefcnt = (char *)malloc(nmbclusters+CLBYTES/MCLBYTES, 374 M_MBUF, M_NOWAIT); 375 bzero(mclrefcnt, nmbclusters+CLBYTES/MCLBYTES); 376 mb_map = kmem_suballoc(kmem_map, (vm_offset_t *)&mbutl, &maxaddr, 377 nmbclusters * MCLBYTES, FALSE); 378 /* 379 * Initialize callouts 380 */ 381 callfree = callout; 382 for (i = 1; i < ncallout; i++) 383 callout[i-1].c_next = &callout[i]; 384 385 if (boothowto & RB_CONFIG) { 386 userconfig(); 387 cninit(); /* the preferred console may have changed */ 388 } 389 390#ifdef BOUNCE_BUFFERS 391 /* 392 * init bounce buffers 393 */ 394 vm_bounce_init(); 395#endif 396 /* 397 * XXX allocate a contiguous area for ISA (non busmaster) DMA 398 * operations. This _should_ only be done if the DMA channels 399 * will actually be used, but for now we do it always. 400 */ 401#define DMAPAGES 8 402 isaphysmem = 403 vm_page_alloc_contig(DMAPAGES * PAGE_SIZE, 0, 0xfffffful, 64*1024); 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}; 483 484static void 485identifycpu() 486{ 487 printf("CPU: "); 488 if (cpu >= 0 489 && cpu < (sizeof i386_cpus/sizeof(struct cpu_nameclass))) { 490 cpu_class = i386_cpus[cpu].cpu_class; 491 strncpy(cpu_model, i386_cpus[cpu].cpu_name, sizeof cpu_model); 492 } else { 493 printf("unknown cpu type %d\n", cpu); 494 panic("startup: bad cpu id"); 495 } 496 497#if defined(I586_CPU) 498 if(cpu_class == CPUCLASS_586) { 499 calibrate_cyclecounter(); 500 } 501#endif 502#if defined(I486_CPU) || defined(I586_CPU) 503 if (!strcmp(cpu_vendor,"GenuineIntel")) { 504 if ((cpu_id & 0xf00) > 3) { 505 cpu_model[0] = '\0'; 506 507 switch (cpu_id & 0x3000) { 508 case 0x1000: 509 strcpy(cpu_model, "Overdrive "); 510 break; 511 case 0x2000: 512 strcpy(cpu_model, "Dual "); 513 break; 514 } 515 if ((cpu_id & 0xf00) == 0x400) { 516 strcat(cpu_model, "i486 "); 517#if defined(I586_CPU) 518 } else if ((cpu_id & 0xf00) == 0x500) { 519 strcat(cpu_model, "Pentium"); /* nb no space */ 520#endif 521 } else { 522 strcat(cpu_model, "unknown "); 523 } 524 525 switch (cpu_id & 0xff0) { 526 case 0x400: 527 strcat(cpu_model, "DX"); break; 528 case 0x410: 529 strcat(cpu_model, "DX"); break; 530 case 0x420: 531 strcat(cpu_model, "SX"); break; 532 case 0x430: 533 strcat(cpu_model, "DX2"); break; 534 case 0x440: 535 strcat(cpu_model, "SL"); break; 536 case 0x450: 537 strcat(cpu_model, "SX2"); break; 538 case 0x470: 539 strcat(cpu_model, "DX2 Write-Back Enhanced"); 540 break; 541 case 0x480: 542 strcat(cpu_model, "DX4"); break; 543#if defined(I586_CPU) 544 case 0x510: 545 case 0x520: 546 /* 547 * We used to do all sorts of nonsense here 548 * to print out iCOMP numbers. Since these 549 * are meaningless except to Intel 550 * marketroids, there seems to be little 551 * sense in doing so. 552 */ 553 break; 554#endif 555 } 556 } 557 } 558#endif 559 printf("%s (", cpu_model); 560 switch(cpu_class) { 561 case CPUCLASS_286: 562 printf("286"); 563 break; 564#if defined(I386_CPU) 565 case CPUCLASS_386: 566 printf("386"); 567 break; 568#endif 569#if defined(I486_CPU) 570 case CPUCLASS_486: 571 printf("486"); 572 break; 573#endif 574#if defined(I586_CPU) 575 case CPUCLASS_586: 576 printf("%d.%02d-MHz ", 577 ((100 * i586_ctr_rate) >> I586_CTR_RATE_SHIFT) / 100, 578 ((100 * i586_ctr_rate) >> I586_CTR_RATE_SHIFT) % 100); 579 printf("586"); 580 break; 581#endif 582 default: 583 printf("unknown"); /* will panic below... */ 584 } 585 printf("-class CPU)\n"); 586#if defined(I486_CPU) || defined(I586_CPU) 587 if(*cpu_vendor) 588 printf(" Origin = \"%s\"",cpu_vendor); 589 if(cpu_id) 590 printf(" Id = 0x%lx",cpu_id); 591 592 if (!strcmp(cpu_vendor, "GenuineIntel")) { 593 printf(" Stepping=%ld", cpu_id & 0xf); 594 if (cpu_high > 0) { 595#define FEATUREFMT "\020\001FPU\002VME\003PSE\004MCE\005CX8\006APIC" 596 printf("\n Features=0x%b", cpu_feature, FEATUREFMT); 597 } 598 } 599 /* Avoid ugly blank lines: only print newline when we have to. */ 600 if (*cpu_vendor || cpu_id) 601 printf("\n"); 602#endif 603 /* 604 * Now that we have told the user what they have, 605 * let them know if that machine type isn't configured. 606 */ 607 switch (cpu_class) { 608 case CPUCLASS_286: /* a 286 should not make it this far, anyway */ 609#if !defined(I386_CPU) && !defined(I486_CPU) && !defined(I586_CPU) 610#error This kernel is not configured for one of the supported CPUs 611#endif 612#if !defined(I386_CPU) 613 case CPUCLASS_386: 614#endif 615#if !defined(I486_CPU) 616 case CPUCLASS_486: 617#endif 618#if !defined(I586_CPU) 619 case CPUCLASS_586: 620#endif 621 panic("CPU class not configured"); 622 default: 623 break; 624 } 625 dev_attach(&kdc_cpu0); 626} 627 628/* 629 * Send an interrupt to process. 630 * 631 * Stack is set up to allow sigcode stored 632 * in u. to call routine, followed by kcall 633 * to sigreturn routine below. After sigreturn 634 * resets the signal mask, the stack, and the 635 * frame pointer, it returns to the user 636 * specified pc, psl. 637 */ 638void 639sendsig(catcher, sig, mask, code) 640 sig_t catcher; 641 int sig, mask; 642 unsigned code; 643{ 644 register struct proc *p = curproc; 645 register int *regs; 646 register struct sigframe *fp; 647 struct sigframe sf; 648 struct sigacts *psp = p->p_sigacts; 649 int oonstack; 650 651 regs = p->p_md.md_regs; 652 oonstack = psp->ps_sigstk.ss_flags & SA_ONSTACK; 653 /* 654 * Allocate and validate space for the signal handler 655 * context. Note that if the stack is in P0 space, the 656 * call to grow() is a nop, and the useracc() check 657 * will fail if the process has not already allocated 658 * the space with a `brk'. 659 */ 660 if ((psp->ps_flags & SAS_ALTSTACK) && 661 (psp->ps_sigstk.ss_flags & SA_ONSTACK) == 0 && 662 (psp->ps_sigonstack & sigmask(sig))) { 663 fp = (struct sigframe *)(psp->ps_sigstk.ss_sp + 664 psp->ps_sigstk.ss_size - sizeof(struct sigframe)); 665 psp->ps_sigstk.ss_flags |= SA_ONSTACK; 666 } else { 667 fp = (struct sigframe *)(regs[tESP] 668 - sizeof(struct sigframe)); 669 } 670 671 /* 672 * grow() will return FALSE if the fp will not fit inside the stack 673 * and the stack can not be grown. useracc will return FALSE 674 * if access is denied. 675 */ 676 if ((grow(p, (int)fp) == FALSE) || 677 (useracc((caddr_t)fp, sizeof (struct sigframe), B_WRITE) == FALSE)) { 678 /* 679 * Process has trashed its stack; give it an illegal 680 * instruction to halt it in its tracks. 681 */ 682 SIGACTION(p, SIGILL) = SIG_DFL; 683 sig = sigmask(SIGILL); 684 p->p_sigignore &= ~sig; 685 p->p_sigcatch &= ~sig; 686 p->p_sigmask &= ~sig; 687 psignal(p, SIGILL); 688 return; 689 } 690 691 /* 692 * Build the argument list for the signal handler. 693 */ 694 if (p->p_sysent->sv_sigtbl) { 695 if (sig < p->p_sysent->sv_sigsize) 696 sig = p->p_sysent->sv_sigtbl[sig]; 697 else 698 sig = p->p_sysent->sv_sigsize + 1; 699 } 700 sf.sf_signum = sig; 701 sf.sf_code = code; 702 sf.sf_scp = &fp->sf_sc; 703 sf.sf_addr = (char *) regs[tERR]; 704 sf.sf_handler = catcher; 705 706 /* save scratch registers */ 707 sf.sf_sc.sc_eax = regs[tEAX]; 708 sf.sf_sc.sc_ebx = regs[tEBX]; 709 sf.sf_sc.sc_ecx = regs[tECX]; 710 sf.sf_sc.sc_edx = regs[tEDX]; 711 sf.sf_sc.sc_esi = regs[tESI]; 712 sf.sf_sc.sc_edi = regs[tEDI]; 713 sf.sf_sc.sc_cs = regs[tCS]; 714 sf.sf_sc.sc_ds = regs[tDS]; 715 sf.sf_sc.sc_ss = regs[tSS]; 716 sf.sf_sc.sc_es = regs[tES]; 717 sf.sf_sc.sc_isp = regs[tISP]; 718 719 /* 720 * Build the signal context to be used by sigreturn. 721 */ 722 sf.sf_sc.sc_onstack = oonstack; 723 sf.sf_sc.sc_mask = mask; 724 sf.sf_sc.sc_sp = regs[tESP]; 725 sf.sf_sc.sc_fp = regs[tEBP]; 726 sf.sf_sc.sc_pc = regs[tEIP]; 727 sf.sf_sc.sc_ps = regs[tEFLAGS]; 728 729 /* 730 * Copy the sigframe out to the user's stack. 731 */ 732 if (copyout(&sf, fp, sizeof(struct sigframe)) != 0) { 733 /* 734 * Something is wrong with the stack pointer. 735 * ...Kill the process. 736 */ 737 sigexit(p, SIGILL); 738 }; 739 740 regs[tESP] = (int)fp; 741 regs[tEIP] = (int)((struct pcb *)kstack)->pcb_sigc; 742 regs[tEFLAGS] &= ~PSL_VM; 743 regs[tCS] = _ucodesel; 744 regs[tDS] = _udatasel; 745 regs[tES] = _udatasel; 746 regs[tSS] = _udatasel; 747} 748 749/* 750 * System call to cleanup state after a signal 751 * has been taken. Reset signal mask and 752 * stack state from context left by sendsig (above). 753 * Return to previous pc and psl as specified by 754 * context left by sendsig. Check carefully to 755 * make sure that the user has not modified the 756 * state to gain improper privileges. 757 */ 758int 759sigreturn(p, uap, retval) 760 struct proc *p; 761 struct sigreturn_args /* { 762 struct sigcontext *sigcntxp; 763 } */ *uap; 764 int *retval; 765{ 766 register struct sigcontext *scp; 767 register struct sigframe *fp; 768 register int *regs = p->p_md.md_regs; 769 int eflags; 770 771 /* 772 * (XXX old comment) regs[tESP] points to the return address. 773 * The user scp pointer is above that. 774 * The return address is faked in the signal trampoline code 775 * for consistency. 776 */ 777 scp = uap->sigcntxp; 778 fp = (struct sigframe *) 779 ((caddr_t)scp - offsetof(struct sigframe, sf_sc)); 780 781 if (useracc((caddr_t)fp, sizeof (*fp), 0) == 0) 782 return(EINVAL); 783 784 /* 785 * Don't allow users to change privileged or reserved flags. 786 */ 787#define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 788 eflags = scp->sc_ps; 789 /* 790 * XXX do allow users to change the privileged flag PSL_RF. The 791 * cpu sets PSL_RF in tf_eflags for faults. Debuggers should 792 * sometimes set it there too. tf_eflags is kept in the signal 793 * context during signal handling and there is no other place 794 * to remember it, so the PSL_RF bit may be corrupted by the 795 * signal handler without us knowing. Corruption of the PSL_RF 796 * bit at worst causes one more or one less debugger trap, so 797 * allowing it is fairly harmless. 798 */ 799 if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs[tEFLAGS] & ~PSL_RF)) { 800#ifdef DEBUG 801 printf("sigreturn: eflags = 0x%x\n", eflags); 802#endif 803 return(EINVAL); 804 } 805 806 /* 807 * Don't allow users to load a valid privileged %cs. Let the 808 * hardware check for invalid selectors, excess privilege in 809 * other selectors, invalid %eip's and invalid %esp's. 810 */ 811#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 812 if (!CS_SECURE(scp->sc_cs)) { 813#ifdef DEBUG 814 printf("sigreturn: cs = 0x%x\n", scp->sc_cs); 815#endif 816 trapsignal(p, SIGBUS, T_PROTFLT); 817 return(EINVAL); 818 } 819 820 /* restore scratch registers */ 821 regs[tEAX] = scp->sc_eax; 822 regs[tEBX] = scp->sc_ebx; 823 regs[tECX] = scp->sc_ecx; 824 regs[tEDX] = scp->sc_edx; 825 regs[tESI] = scp->sc_esi; 826 regs[tEDI] = scp->sc_edi; 827 regs[tCS] = scp->sc_cs; 828 regs[tDS] = scp->sc_ds; 829 regs[tES] = scp->sc_es; 830 regs[tSS] = scp->sc_ss; 831 regs[tISP] = scp->sc_isp; 832 833 if (useracc((caddr_t)scp, sizeof (*scp), 0) == 0) 834 return(EINVAL); 835 836 if (scp->sc_onstack & 01) 837 p->p_sigacts->ps_sigstk.ss_flags |= SA_ONSTACK; 838 else 839 p->p_sigacts->ps_sigstk.ss_flags &= ~SA_ONSTACK; 840 p->p_sigmask = scp->sc_mask &~ 841 (sigmask(SIGKILL)|sigmask(SIGCONT)|sigmask(SIGSTOP)); 842 regs[tEBP] = scp->sc_fp; 843 regs[tESP] = scp->sc_sp; 844 regs[tEIP] = scp->sc_pc; 845 regs[tEFLAGS] = eflags; 846 return(EJUSTRETURN); 847} 848 849static int waittime = -1; 850static struct pcb dumppcb; 851 852__dead void 853boot(howto) 854 int howto; 855{ 856 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 857 register struct buf *bp; 858 int iter, nbusy; 859 860 waittime = 0; 861 printf("\nsyncing disks... "); 862 863 sync(&proc0, NULL, NULL); 864 865 for (iter = 0; iter < 20; iter++) { 866 nbusy = 0; 867 for (bp = &buf[nbuf]; --bp >= buf; ) { 868 if ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) { 869 nbusy++; 870 } 871 } 872 if (nbusy == 0) 873 break; 874 printf("%d ", nbusy); 875 DELAY(40000 * iter); 876 } 877 if (nbusy) { 878 /* 879 * Failed to sync all blocks. Indicate this and don't 880 * unmount filesystems (thus forcing an fsck on reboot). 881 */ 882 printf("giving up\n"); 883#ifdef SHOW_BUSYBUFS 884 nbusy = 0; 885 for (bp = &buf[nbuf]; --bp >= buf; ) { 886 if ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) { 887 nbusy++; 888 printf("%d: dev:%08x, flags:%08x, blkno:%d, lblkno:%d\n", nbusy, bp->b_dev, bp->b_flags, bp->b_blkno, bp->b_lblkno); 889 } 890 } 891 DELAY(5000000); /* 5 seconds */ 892#endif 893 } else { 894 printf("done\n"); 895 /* 896 * Unmount filesystems 897 */ 898 if (panicstr == 0) 899 vfs_unmountall(); 900 } 901 DELAY(100000); /* wait for console output to finish */ 902 dev_shutdownall(FALSE); 903 } 904 splhigh(); 905 if (howto & RB_HALT) { 906 printf("\n"); 907 printf("The operating system has halted.\n"); 908 printf("Please press any key to reboot.\n\n"); 909 cngetc(); 910 } else { 911 if (howto & RB_DUMP) { 912 if (!cold) { 913 savectx(&dumppcb, 0); 914 dumppcb.pcb_ptd = rcr3(); 915 dumpsys(); 916 } 917 918 if (PANIC_REBOOT_WAIT_TIME != 0) { 919 if (PANIC_REBOOT_WAIT_TIME != -1) { 920 int loop; 921 printf("Automatic reboot in %d seconds - press a key on the console to abort\n", 922 PANIC_REBOOT_WAIT_TIME); 923 for (loop = PANIC_REBOOT_WAIT_TIME * 10; loop > 0; --loop) { 924 DELAY(1000 * 100); /* 1/10th second */ 925 if (cncheckc()) /* Did user type a key? */ 926 break; 927 } 928 if (!loop) 929 goto die; 930 } 931 } else { /* zero time specified - reboot NOW */ 932 goto die; 933 } 934 printf("--> Press a key on the console to reboot <--\n"); 935 cngetc(); 936 } 937 } 938die: 939 printf("Rebooting...\n"); 940 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 941 cpu_reset(); 942 for(;;) ; 943 /* NOTREACHED */ 944} 945 946/* 947 * Magic number for savecore 948 * 949 * exported (symorder) and used at least by savecore(8) 950 * 951 */ 952u_long dumpmag = 0x8fca0101UL; 953 954static int dumpsize = 0; /* also for savecore */ 955 956static int dodump = 1; 957SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, ""); 958 959/* 960 * Doadump comes here after turning off memory management and 961 * getting on the dump stack, either when called above, or by 962 * the auto-restart code. 963 */ 964static void 965dumpsys() 966{ 967 968 if (!dodump) 969 return; 970 if (dumpdev == NODEV) 971 return; 972 if ((minor(dumpdev)&07) != 1) 973 return; 974 if (!(bdevsw[major(dumpdev)])) 975 return; 976 if (!(bdevsw[major(dumpdev)]->d_dump)) 977 return; 978 dumpsize = Maxmem; 979 printf("\ndumping to dev %lx, offset %ld\n", dumpdev, dumplo); 980 printf("dump "); 981 switch ((*bdevsw[major(dumpdev)]->d_dump)(dumpdev)) { 982 983 case ENXIO: 984 printf("device bad\n"); 985 break; 986 987 case EFAULT: 988 printf("device not ready\n"); 989 break; 990 991 case EINVAL: 992 printf("area improper\n"); 993 break; 994 995 case EIO: 996 printf("i/o error\n"); 997 break; 998 999 case EINTR: 1000 printf("aborted from console\n"); 1001 break; 1002 1003 default: 1004 printf("succeeded\n"); 1005 break; 1006 } 1007} 1008 1009/* 1010 * Clear registers on exec 1011 */ 1012void 1013setregs(p, entry, stack) 1014 struct proc *p; 1015 u_long entry; 1016 u_long stack; 1017{ 1018 int *regs = p->p_md.md_regs; 1019 1020 bzero(regs, sizeof(struct trapframe)); 1021 regs[tEIP] = entry; 1022 regs[tESP] = stack; 1023 regs[tEFLAGS] = PSL_USER | (regs[tEFLAGS] & PSL_T); 1024 regs[tSS] = _udatasel; 1025 regs[tDS] = _udatasel; 1026 regs[tES] = _udatasel; 1027 regs[tCS] = _ucodesel; 1028 1029 p->p_addr->u_pcb.pcb_flags = 0; /* no fp at all */ 1030 load_cr0(rcr0() | CR0_TS); /* start emulating */ 1031#if NNPX > 0 1032 npxinit(__INITIAL_NPXCW__); 1033#endif /* NNPX > 0 */ 1034} 1035 1036static int 1037sysctl_machdep_adjkerntz SYSCTL_HANDLER_ARGS 1038{ 1039 int error; 1040 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 1041 req); 1042 if (!error && req->newptr) 1043 resettodr(); 1044 return (error); 1045} 1046 1047SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 1048 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 1049 1050SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, 1051 CTLFLAG_RW, &disable_rtc_set, 0, ""); 1052 1053SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo, 1054 CTLFLAG_RD, &bootinfo, bootinfo, ""); 1055 1056/* 1057 * Initialize 386 and configure to run kernel 1058 */ 1059 1060/* 1061 * Initialize segments & interrupt table 1062 */ 1063 1064int currentldt; 1065int _default_ldt; 1066union descriptor gdt[NGDT]; /* global descriptor table */ 1067struct gate_descriptor idt[NIDT]; /* interrupt descriptor table */ 1068union descriptor ldt[NLDT]; /* local descriptor table */ 1069 1070static struct i386tss dblfault_tss; 1071static char dblfault_stack[512]; 1072 1073extern struct user *proc0paddr; 1074 1075/* software prototypes -- in more palatable form */ 1076struct soft_segment_descriptor gdt_segs[] = { 1077/* GNULL_SEL 0 Null Descriptor */ 1078{ 0x0, /* segment base address */ 1079 0x0, /* length */ 1080 0, /* segment type */ 1081 0, /* segment descriptor priority level */ 1082 0, /* segment descriptor present */ 1083 0, 0, 1084 0, /* default 32 vs 16 bit size */ 1085 0 /* limit granularity (byte/page units)*/ }, 1086/* GCODE_SEL 1 Code Descriptor for kernel */ 1087{ 0x0, /* segment base address */ 1088 0xfffff, /* length - all address space */ 1089 SDT_MEMERA, /* segment type */ 1090 0, /* segment descriptor priority level */ 1091 1, /* segment descriptor present */ 1092 0, 0, 1093 1, /* default 32 vs 16 bit size */ 1094 1 /* limit granularity (byte/page units)*/ }, 1095/* GDATA_SEL 2 Data Descriptor for kernel */ 1096{ 0x0, /* segment base address */ 1097 0xfffff, /* length - all address space */ 1098 SDT_MEMRWA, /* segment type */ 1099 0, /* segment descriptor priority level */ 1100 1, /* segment descriptor present */ 1101 0, 0, 1102 1, /* default 32 vs 16 bit size */ 1103 1 /* limit granularity (byte/page units)*/ }, 1104/* GLDT_SEL 3 LDT Descriptor */ 1105{ (int) ldt, /* segment base address */ 1106 sizeof(ldt)-1, /* length - all address space */ 1107 SDT_SYSLDT, /* segment type */ 1108 0, /* segment descriptor priority level */ 1109 1, /* segment descriptor present */ 1110 0, 0, 1111 0, /* unused - default 32 vs 16 bit size */ 1112 0 /* limit granularity (byte/page units)*/ }, 1113/* GTGATE_SEL 4 Null Descriptor - Placeholder */ 1114{ 0x0, /* segment base address */ 1115 0x0, /* length - all address space */ 1116 0, /* segment type */ 1117 0, /* segment descriptor priority level */ 1118 0, /* segment descriptor present */ 1119 0, 0, 1120 0, /* default 32 vs 16 bit size */ 1121 0 /* limit granularity (byte/page units)*/ }, 1122/* GPANIC_SEL 5 Panic Tss Descriptor */ 1123{ (int) &dblfault_tss, /* segment base address */ 1124 sizeof(struct i386tss)-1,/* length - all address space */ 1125 SDT_SYS386TSS, /* segment type */ 1126 0, /* segment descriptor priority level */ 1127 1, /* segment descriptor present */ 1128 0, 0, 1129 0, /* unused - default 32 vs 16 bit size */ 1130 0 /* limit granularity (byte/page units)*/ }, 1131/* GPROC0_SEL 6 Proc 0 Tss Descriptor */ 1132{ (int) kstack, /* segment base address */ 1133 sizeof(struct i386tss)-1,/* length - all address space */ 1134 SDT_SYS386TSS, /* segment type */ 1135 0, /* segment descriptor priority level */ 1136 1, /* segment descriptor present */ 1137 0, 0, 1138 0, /* unused - default 32 vs 16 bit size */ 1139 0 /* limit granularity (byte/page units)*/ }, 1140/* GUSERLDT_SEL 7 User LDT Descriptor per process */ 1141{ (int) ldt, /* segment base address */ 1142 (512 * sizeof(union descriptor)-1), /* length */ 1143 SDT_SYSLDT, /* segment type */ 1144 0, /* segment descriptor priority level */ 1145 1, /* segment descriptor present */ 1146 0, 0, 1147 0, /* unused - default 32 vs 16 bit size */ 1148 0 /* limit granularity (byte/page units)*/ }, 1149/* GAPMCODE32_SEL 8 APM BIOS 32-bit interface (32bit Code) */ 1150{ 0, /* segment base address (overwritten by APM) */ 1151 0xfffff, /* length */ 1152 SDT_MEMERA, /* segment type */ 1153 0, /* segment descriptor priority level */ 1154 1, /* segment descriptor present */ 1155 0, 0, 1156 1, /* default 32 vs 16 bit size */ 1157 1 /* limit granularity (byte/page units)*/ }, 1158/* GAPMCODE16_SEL 9 APM BIOS 32-bit interface (16bit Code) */ 1159{ 0, /* segment base address (overwritten by APM) */ 1160 0xfffff, /* length */ 1161 SDT_MEMERA, /* segment type */ 1162 0, /* segment descriptor priority level */ 1163 1, /* segment descriptor present */ 1164 0, 0, 1165 0, /* default 32 vs 16 bit size */ 1166 1 /* limit granularity (byte/page units)*/ }, 1167/* GAPMDATA_SEL 10 APM BIOS 32-bit interface (Data) */ 1168{ 0, /* segment base address (overwritten by APM) */ 1169 0xfffff, /* length */ 1170 SDT_MEMRWA, /* segment type */ 1171 0, /* segment descriptor priority level */ 1172 1, /* segment descriptor present */ 1173 0, 0, 1174 1, /* default 32 vs 16 bit size */ 1175 1 /* limit granularity (byte/page units)*/ }, 1176}; 1177 1178static struct soft_segment_descriptor ldt_segs[] = { 1179 /* Null Descriptor - overwritten by call gate */ 1180{ 0x0, /* segment base address */ 1181 0x0, /* length - all address space */ 1182 0, /* segment type */ 1183 0, /* segment descriptor priority level */ 1184 0, /* segment descriptor present */ 1185 0, 0, 1186 0, /* default 32 vs 16 bit size */ 1187 0 /* limit granularity (byte/page units)*/ }, 1188 /* Null Descriptor - overwritten by call gate */ 1189{ 0x0, /* segment base address */ 1190 0x0, /* length - all address space */ 1191 0, /* segment type */ 1192 0, /* segment descriptor priority level */ 1193 0, /* segment descriptor present */ 1194 0, 0, 1195 0, /* default 32 vs 16 bit size */ 1196 0 /* limit granularity (byte/page units)*/ }, 1197 /* Null Descriptor - overwritten by call gate */ 1198{ 0x0, /* segment base address */ 1199 0x0, /* length - all address space */ 1200 0, /* segment type */ 1201 0, /* segment descriptor priority level */ 1202 0, /* segment descriptor present */ 1203 0, 0, 1204 0, /* default 32 vs 16 bit size */ 1205 0 /* limit granularity (byte/page units)*/ }, 1206 /* Code Descriptor for user */ 1207{ 0x0, /* segment base address */ 1208 0xfffff, /* length - all address space */ 1209 SDT_MEMERA, /* segment type */ 1210 SEL_UPL, /* segment descriptor priority level */ 1211 1, /* segment descriptor present */ 1212 0, 0, 1213 1, /* default 32 vs 16 bit size */ 1214 1 /* limit granularity (byte/page units)*/ }, 1215 /* Data Descriptor for user */ 1216{ 0x0, /* segment base address */ 1217 0xfffff, /* length - all address space */ 1218 SDT_MEMRWA, /* segment type */ 1219 SEL_UPL, /* segment descriptor priority level */ 1220 1, /* segment descriptor present */ 1221 0, 0, 1222 1, /* default 32 vs 16 bit size */ 1223 1 /* limit granularity (byte/page units)*/ }, 1224}; 1225 1226void 1227setidt(idx, func, typ, dpl, selec) 1228 int idx; 1229 inthand_t *func; 1230 int typ; 1231 int dpl; 1232 int selec; 1233{ 1234 struct gate_descriptor *ip = idt + idx; 1235 1236 ip->gd_looffset = (int)func; 1237 ip->gd_selector = selec; 1238 ip->gd_stkcpy = 0; 1239 ip->gd_xx = 0; 1240 ip->gd_type = typ; 1241 ip->gd_dpl = dpl; 1242 ip->gd_p = 1; 1243 ip->gd_hioffset = ((int)func)>>16 ; 1244} 1245 1246#define IDTVEC(name) __CONCAT(X,name) 1247 1248extern inthand_t 1249 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 1250 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 1251 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 1252 IDTVEC(page), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 1253 IDTVEC(syscall); 1254 1255#if defined(COMPAT_LINUX) || defined(LINUX) 1256extern inthand_t 1257 IDTVEC(linux_syscall); 1258#endif 1259 1260void 1261sdtossd(sd, ssd) 1262 struct segment_descriptor *sd; 1263 struct soft_segment_descriptor *ssd; 1264{ 1265 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 1266 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 1267 ssd->ssd_type = sd->sd_type; 1268 ssd->ssd_dpl = sd->sd_dpl; 1269 ssd->ssd_p = sd->sd_p; 1270 ssd->ssd_def32 = sd->sd_def32; 1271 ssd->ssd_gran = sd->sd_gran; 1272} 1273 1274void 1275init386(first) 1276 int first; 1277{ 1278 int x; 1279 unsigned biosbasemem, biosextmem; 1280 struct gate_descriptor *gdp; 1281 int gsel_tss; 1282 /* table descriptors - used to load tables by microp */ 1283 struct region_descriptor r_gdt, r_idt; 1284 int pagesinbase, pagesinext; 1285 int target_page, pa_indx; 1286 1287 proc0.p_addr = proc0paddr; 1288 1289 /* 1290 * Initialize the console before we print anything out. 1291 */ 1292 cninit(); 1293 1294 /* 1295 * make gdt memory segments, the code segment goes up to end of the 1296 * page with etext in it, the data segment goes to the end of 1297 * the address space 1298 */ 1299 /* 1300 * XXX text protection is temporarily (?) disabled. The limit was 1301 * i386_btop(i386_round_page(etext)) - 1. 1302 */ 1303 gdt_segs[GCODE_SEL].ssd_limit = i386_btop(0) - 1; 1304 gdt_segs[GDATA_SEL].ssd_limit = i386_btop(0) - 1; 1305 for (x = 0; x < NGDT; x++) 1306 ssdtosd(&gdt_segs[x], &gdt[x].sd); 1307 1308 /* make ldt memory segments */ 1309 /* 1310 * The data segment limit must not cover the user area because we 1311 * don't want the user area to be writable in copyout() etc. (page 1312 * level protection is lost in kernel mode on 386's). Also, we 1313 * don't want the user area to be writable directly (page level 1314 * protection of the user area is not available on 486's with 1315 * CR0_WP set, because there is no user-read/kernel-write mode). 1316 * 1317 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it 1318 * should be spelled ...MAX_USER... 1319 */ 1320#define VM_END_USER_RW_ADDRESS VM_MAXUSER_ADDRESS 1321 /* 1322 * The code segment limit has to cover the user area until we move 1323 * the signal trampoline out of the user area. This is safe because 1324 * the code segment cannot be written to directly. 1325 */ 1326#define VM_END_USER_R_ADDRESS (VM_END_USER_RW_ADDRESS + UPAGES * NBPG) 1327 ldt_segs[LUCODE_SEL].ssd_limit = i386_btop(VM_END_USER_R_ADDRESS) - 1; 1328 ldt_segs[LUDATA_SEL].ssd_limit = i386_btop(VM_END_USER_RW_ADDRESS) - 1; 1329 /* Note. eventually want private ldts per process */ 1330 for (x = 0; x < NLDT; x++) 1331 ssdtosd(&ldt_segs[x], &ldt[x].sd); 1332 1333 /* exceptions */ 1334 for (x = 0; x < NIDT; x++) 1335 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1336 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1337 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1338 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1339 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1340 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1341 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1342 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1343 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1344 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL)); 1345 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1346 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1347 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1348 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1349 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1350 setidt(14, &IDTVEC(page), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1351 setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1352 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1353 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1354#if defined(COMPAT_LINUX) || defined(LINUX) 1355 setidt(0x80, &IDTVEC(linux_syscall), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1356#endif 1357 1358#include "isa.h" 1359#if NISA >0 1360 isa_defaultirq(); 1361#endif 1362 rand_initialize(); 1363 1364 r_gdt.rd_limit = sizeof(gdt) - 1; 1365 r_gdt.rd_base = (int) gdt; 1366 lgdt(&r_gdt); 1367 1368 r_idt.rd_limit = sizeof(idt) - 1; 1369 r_idt.rd_base = (int) idt; 1370 lidt(&r_idt); 1371 1372 _default_ldt = GSEL(GLDT_SEL, SEL_KPL); 1373 lldt(_default_ldt); 1374 currentldt = _default_ldt; 1375 1376#ifdef DDB 1377 kdb_init(); 1378 if (boothowto & RB_KDB) 1379 Debugger("Boot flags requested debugger"); 1380#endif 1381 1382 /* Use BIOS values stored in RTC CMOS RAM, since probing 1383 * breaks certain 386 AT relics. 1384 */ 1385 biosbasemem = rtcin(RTC_BASELO)+ (rtcin(RTC_BASEHI)<<8); 1386 biosextmem = rtcin(RTC_EXTLO)+ (rtcin(RTC_EXTHI)<<8); 1387 1388 /* 1389 * Print a warning if the official BIOS interface disagrees 1390 * with the hackish interface used above. Eventually only 1391 * the official interface should be used. 1392 */ 1393 if (bootinfo.bi_memsizes_valid) { 1394 if (bootinfo.bi_basemem != biosbasemem) 1395 printf("BIOS basemem (%ldK) != RTC basemem (%dK)\n", 1396 bootinfo.bi_basemem, biosbasemem); 1397 if (bootinfo.bi_extmem != biosextmem) 1398 printf("BIOS extmem (%ldK) != RTC extmem (%dK)\n", 1399 bootinfo.bi_extmem, biosextmem); 1400 } 1401 1402 /* 1403 * If BIOS tells us that it has more than 640k in the basemem, 1404 * don't believe it - set it to 640k. 1405 */ 1406 if (biosbasemem > 640) 1407 biosbasemem = 640; 1408 1409 /* 1410 * Some 386 machines might give us a bogus number for extended 1411 * mem. If this happens, stop now. 1412 */ 1413#ifndef LARGEMEM 1414 if (biosextmem > 65536) { 1415 panic("extended memory beyond limit of 64MB"); 1416 /* NOTREACHED */ 1417 } 1418#endif 1419 1420 pagesinbase = biosbasemem * 1024 / NBPG; 1421 pagesinext = biosextmem * 1024 / NBPG; 1422 1423 /* 1424 * Special hack for chipsets that still remap the 384k hole when 1425 * there's 16MB of memory - this really confuses people that 1426 * are trying to use bus mastering ISA controllers with the 1427 * "16MB limit"; they only have 16MB, but the remapping puts 1428 * them beyond the limit. 1429 */ 1430 /* 1431 * If extended memory is between 15-16MB (16-17MB phys address range), 1432 * chop it to 15MB. 1433 */ 1434 if ((pagesinext > 3840) && (pagesinext < 4096)) 1435 pagesinext = 3840; 1436 1437 /* 1438 * Maxmem isn't the "maximum memory", it's one larger than the 1439 * highest page of of the physical address space. It 1440 */ 1441 Maxmem = pagesinext + 0x100000/PAGE_SIZE; 1442 1443#ifdef MAXMEM 1444 Maxmem = MAXMEM/4; 1445#endif 1446 1447 /* call pmap initialization to make new kernel address space */ 1448 pmap_bootstrap (first, 0); 1449 1450 /* 1451 * Size up each available chunk of physical memory. 1452 */ 1453 1454 /* 1455 * We currently don't bother testing base memory. 1456 * XXX ...but we probably should. 1457 */ 1458 pa_indx = 0; 1459 badpages = 0; 1460 if (pagesinbase > 1) { 1461 phys_avail[pa_indx++] = PAGE_SIZE; /* skip first page of memory */ 1462 phys_avail[pa_indx] = ptoa(pagesinbase);/* memory up to the ISA hole */ 1463 physmem = pagesinbase - 1; 1464 } else { 1465 /* point at first chunk end */ 1466 pa_indx++; 1467 } 1468 1469 for (target_page = avail_start; target_page < ptoa(Maxmem); target_page += PAGE_SIZE) { 1470 int tmp, page_bad = FALSE; 1471 1472 /* 1473 * map page into kernel: valid, read/write, non-cacheable 1474 */ 1475 *(int *)CMAP1 = PG_V | PG_KW | PG_N | target_page; 1476 pmap_update(); 1477 1478 tmp = *(int *)CADDR1; 1479 /* 1480 * Test for alternating 1's and 0's 1481 */ 1482 *(int *)CADDR1 = 0xaaaaaaaa; 1483 if (*(int *)CADDR1 != 0xaaaaaaaa) { 1484 page_bad = TRUE; 1485 } 1486 /* 1487 * Test for alternating 0's and 1's 1488 */ 1489 *(int *)CADDR1 = 0x55555555; 1490 if (*(int *)CADDR1 != 0x55555555) { 1491 page_bad = TRUE; 1492 } 1493 /* 1494 * Test for all 1's 1495 */ 1496 *(int *)CADDR1 = 0xffffffff; 1497 if (*(int *)CADDR1 != 0xffffffff) { 1498 page_bad = TRUE; 1499 } 1500 /* 1501 * Test for all 0's 1502 */ 1503 *(int *)CADDR1 = 0x0; 1504 if (*(int *)CADDR1 != 0x0) { 1505 /* 1506 * test of page failed 1507 */ 1508 page_bad = TRUE; 1509 } 1510 /* 1511 * Restore original value. 1512 */ 1513 *(int *)CADDR1 = tmp; 1514 1515 /* 1516 * Adjust array of valid/good pages. 1517 */ 1518 if (page_bad == FALSE) { 1519 /* 1520 * If this good page is a continuation of the 1521 * previous set of good pages, then just increase 1522 * the end pointer. Otherwise start a new chunk. 1523 * Note that "end" points one higher than end, 1524 * making the range >= start and < end. 1525 */ 1526 if (phys_avail[pa_indx] == target_page) { 1527 phys_avail[pa_indx] += PAGE_SIZE; 1528 } else { 1529 pa_indx++; 1530 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 1531 printf("Too many holes in the physical address space, giving up\n"); 1532 pa_indx--; 1533 break; 1534 } 1535 phys_avail[pa_indx++] = target_page; /* start */ 1536 phys_avail[pa_indx] = target_page + PAGE_SIZE; /* end */ 1537 } 1538 physmem++; 1539 } else { 1540 badpages++; 1541 page_bad = FALSE; 1542 } 1543 } 1544 1545 *(int *)CMAP1 = 0; 1546 pmap_update(); 1547 1548 /* 1549 * XXX 1550 * The last chunk must contain at least one page plus the message 1551 * buffer to avoid complicating other code (message buffer address 1552 * calculation, etc.). 1553 */ 1554 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 1555 round_page(sizeof(struct msgbuf)) >= phys_avail[pa_indx]) { 1556 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 1557 phys_avail[pa_indx--] = 0; 1558 phys_avail[pa_indx--] = 0; 1559 } 1560 1561 Maxmem = atop(phys_avail[pa_indx]); 1562 1563 /* Trim off space for the message buffer. */ 1564 phys_avail[pa_indx] -= round_page(sizeof(struct msgbuf)); 1565 1566 avail_end = phys_avail[pa_indx]; 1567 1568 /* now running on new page tables, configured,and u/iom is accessible */ 1569 1570 /* make a initial tss so microp can get interrupt stack on syscall! */ 1571 proc0.p_addr->u_pcb.pcb_tss.tss_esp0 = (int) kstack + UPAGES*NBPG; 1572 proc0.p_addr->u_pcb.pcb_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ; 1573 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 1574 1575 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 = 1576 dblfault_tss.tss_esp2 = (int) &dblfault_stack[sizeof(dblfault_stack)]; 1577 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 = 1578 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL); 1579 dblfault_tss.tss_cr3 = IdlePTD; 1580 dblfault_tss.tss_eip = (int) dblfault_handler; 1581 dblfault_tss.tss_eflags = PSL_KERNEL; 1582 dblfault_tss.tss_ds = dblfault_tss.tss_es = dblfault_tss.tss_fs = dblfault_tss.tss_gs = 1583 GSEL(GDATA_SEL, SEL_KPL); 1584 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL); 1585 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL); 1586 1587 ((struct i386tss *)gdt_segs[GPROC0_SEL].ssd_base)->tss_ioopt = 1588 (sizeof(struct i386tss))<<16; 1589 1590 ltr(gsel_tss); 1591 1592 /* make a call gate to reenter kernel with */ 1593 gdp = &ldt[LSYS5CALLS_SEL].gd; 1594 1595 x = (int) &IDTVEC(syscall); 1596 gdp->gd_looffset = x++; 1597 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL); 1598 gdp->gd_stkcpy = 1; 1599 gdp->gd_type = SDT_SYS386CGT; 1600 gdp->gd_dpl = SEL_UPL; 1601 gdp->gd_p = 1; 1602 gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16; 1603 1604 /* transfer to user mode */ 1605 1606 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL); 1607 _udatasel = LSEL(LUDATA_SEL, SEL_UPL); 1608 1609 /* setup proc 0's pcb */ 1610 bcopy(&sigcode, proc0.p_addr->u_pcb.pcb_sigc, szsigcode); 1611 proc0.p_addr->u_pcb.pcb_flags = 0; 1612 proc0.p_addr->u_pcb.pcb_ptd = IdlePTD; 1613} 1614 1615/* 1616 * The registers are in the frame; the frame is in the user area of 1617 * the process in question; when the process is active, the registers 1618 * are in "the kernel stack"; when it's not, they're still there, but 1619 * things get flipped around. So, since p->p_md.md_regs is the whole address 1620 * of the register set, take its offset from the kernel stack, and 1621 * index into the user block. Don't you just *love* virtual memory? 1622 * (I'm starting to think seymour is right...) 1623 */ 1624#define TF_REGP(p) ((struct trapframe *) \ 1625 ((char *)(p)->p_addr \ 1626 + ((char *)(p)->p_md.md_regs - kstack))) 1627 1628int 1629ptrace_set_pc(p, addr) 1630 struct proc *p; 1631 unsigned int addr; 1632{ 1633 TF_REGP(p)->tf_eip = addr; 1634 return (0); 1635} 1636 1637int 1638ptrace_single_step(p) 1639 struct proc *p; 1640{ 1641 TF_REGP(p)->tf_eflags |= PSL_T; 1642 return (0); 1643} 1644 1645int ptrace_write_u(p, off, data) 1646 struct proc *p; 1647 vm_offset_t off; 1648 int data; 1649{ 1650 struct trapframe frame_copy; 1651 vm_offset_t min; 1652 struct trapframe *tp; 1653 1654 /* 1655 * Privileged kernel state is scattered all over the user area. 1656 * Only allow write access to parts of regs and to fpregs. 1657 */ 1658 min = (char *)p->p_md.md_regs - kstack; 1659 if (off >= min && off <= min + sizeof(struct trapframe) - sizeof(int)) { 1660 tp = TF_REGP(p); 1661 frame_copy = *tp; 1662 *(int *)((char *)&frame_copy + (off - min)) = data; 1663 if (!EFLAGS_SECURE(frame_copy.tf_eflags, tp->tf_eflags) || 1664 !CS_SECURE(frame_copy.tf_cs)) 1665 return (EINVAL); 1666 *(int*)((char *)p->p_addr + off) = data; 1667 return (0); 1668 } 1669 min = offsetof(struct user, u_pcb) + offsetof(struct pcb, pcb_savefpu); 1670 if (off >= min && off <= min + sizeof(struct save87) - sizeof(int)) { 1671 *(int*)((char *)p->p_addr + off) = data; 1672 return (0); 1673 } 1674 return (EFAULT); 1675} 1676 1677int 1678fill_regs(p, regs) 1679 struct proc *p; 1680 struct reg *regs; 1681{ 1682 struct trapframe *tp; 1683 1684 tp = TF_REGP(p); 1685 regs->r_es = tp->tf_es; 1686 regs->r_ds = tp->tf_ds; 1687 regs->r_edi = tp->tf_edi; 1688 regs->r_esi = tp->tf_esi; 1689 regs->r_ebp = tp->tf_ebp; 1690 regs->r_ebx = tp->tf_ebx; 1691 regs->r_edx = tp->tf_edx; 1692 regs->r_ecx = tp->tf_ecx; 1693 regs->r_eax = tp->tf_eax; 1694 regs->r_eip = tp->tf_eip; 1695 regs->r_cs = tp->tf_cs; 1696 regs->r_eflags = tp->tf_eflags; 1697 regs->r_esp = tp->tf_esp; 1698 regs->r_ss = tp->tf_ss; 1699 return (0); 1700} 1701 1702int 1703set_regs(p, regs) 1704 struct proc *p; 1705 struct reg *regs; 1706{ 1707 struct trapframe *tp; 1708 1709 tp = TF_REGP(p); 1710 if (!EFLAGS_SECURE(regs->r_eflags, tp->tf_eflags) || 1711 !CS_SECURE(regs->r_cs)) 1712 return (EINVAL); 1713 tp->tf_es = regs->r_es; 1714 tp->tf_ds = regs->r_ds; 1715 tp->tf_edi = regs->r_edi; 1716 tp->tf_esi = regs->r_esi; 1717 tp->tf_ebp = regs->r_ebp; 1718 tp->tf_ebx = regs->r_ebx; 1719 tp->tf_edx = regs->r_edx; 1720 tp->tf_ecx = regs->r_ecx; 1721 tp->tf_eax = regs->r_eax; 1722 tp->tf_eip = regs->r_eip; 1723 tp->tf_cs = regs->r_cs; 1724 tp->tf_eflags = regs->r_eflags; 1725 tp->tf_esp = regs->r_esp; 1726 tp->tf_ss = regs->r_ss; 1727 return (0); 1728} 1729 1730#ifndef DDB 1731void 1732Debugger(const char *msg) 1733{ 1734 printf("Debugger(\"%s\") called.\n", msg); 1735} 1736#endif /* no DDB */ 1737 1738#include <sys/disklabel.h> 1739#define b_cylin b_resid 1740/* 1741 * Determine the size of the transfer, and make sure it is 1742 * within the boundaries of the partition. Adjust transfer 1743 * if needed, and signal errors or early completion. 1744 */ 1745int 1746bounds_check_with_label(struct buf *bp, struct disklabel *lp, int wlabel) 1747{ 1748 struct partition *p = lp->d_partitions + dkpart(bp->b_dev); 1749 int labelsect = lp->d_partitions[0].p_offset; 1750 int maxsz = p->p_size, 1751 sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT; 1752 1753 /* overwriting disk label ? */ 1754 /* XXX should also protect bootstrap in first 8K */ 1755 if (bp->b_blkno + p->p_offset <= LABELSECTOR + labelsect && 1756#if LABELSECTOR != 0 1757 bp->b_blkno + p->p_offset + sz > LABELSECTOR + labelsect && 1758#endif 1759 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 1760 bp->b_error = EROFS; 1761 goto bad; 1762 } 1763 1764#if defined(DOSBBSECTOR) && defined(notyet) 1765 /* overwriting master boot record? */ 1766 if (bp->b_blkno + p->p_offset <= DOSBBSECTOR && 1767 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 1768 bp->b_error = EROFS; 1769 goto bad; 1770 } 1771#endif 1772 1773 /* beyond partition? */ 1774 if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz) { 1775 /* if exactly at end of disk, return an EOF */ 1776 if (bp->b_blkno == maxsz) { 1777 bp->b_resid = bp->b_bcount; 1778 return(0); 1779 } 1780 /* or truncate if part of it fits */ 1781 sz = maxsz - bp->b_blkno; 1782 if (sz <= 0) { 1783 bp->b_error = EINVAL; 1784 goto bad; 1785 } 1786 bp->b_bcount = sz << DEV_BSHIFT; 1787 } 1788 1789 /* calculate cylinder for disksort to order transfers with */ 1790 bp->b_pblkno = bp->b_blkno + p->p_offset; 1791 bp->b_cylin = bp->b_pblkno / lp->d_secpercyl; 1792 return(1); 1793 1794bad: 1795 bp->b_flags |= B_ERROR; 1796 return(-1); 1797} 1798 1799int 1800disk_externalize(int drive, struct sysctl_req *req) 1801{ 1802 return SYSCTL_OUT(req, &drive, sizeof drive); 1803} 1804