machdep.c revision 13228
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 1.166 1995/12/30 23:13:32 davidg Exp $ 39 */ 40 41#include "npx.h" 42#include "isa.h" 43#include "opt_sysvipc.h" 44#include "opt_ddb.h" 45 46#include <sys/param.h> 47#include <sys/systm.h> 48#include <sys/sysproto.h> 49#include <sys/signalvar.h> 50#include <sys/kernel.h> 51#include <sys/proc.h> 52#include <sys/buf.h> 53#include <sys/reboot.h> 54#include <sys/conf.h> 55#include <sys/file.h> 56#include <sys/callout.h> 57#include <sys/malloc.h> 58#include <sys/mbuf.h> 59#include <sys/mount.h> 60#include <sys/msgbuf.h> 61#include <sys/ioctl.h> 62#include <sys/sysent.h> 63#include <sys/tty.h> 64#include <sys/sysctl.h> 65#include <sys/devconf.h> 66#include <sys/vmmeter.h> 67 68#ifdef SYSVSHM 69#include <sys/shm.h> 70#endif 71 72#ifdef SYSVMSG 73#include <sys/msg.h> 74#endif 75 76#ifdef SYSVSEM 77#include <sys/sem.h> 78#endif 79 80#include <vm/vm.h> 81#include <vm/vm_param.h> 82#include <vm/vm_prot.h> 83#include <vm/lock.h> 84#include <vm/vm_kern.h> 85#include <vm/vm_object.h> 86#include <vm/vm_page.h> 87#include <vm/vm_map.h> 88#include <vm/vm_pager.h> 89#include <vm/vm_extern.h> 90 91#include <sys/user.h> 92#include <sys/exec.h> 93#include <sys/vnode.h> 94 95#include <ddb/ddb.h> 96 97#include <net/netisr.h> 98 99#include <machine/cpu.h> 100#include <machine/npx.h> 101#include <machine/reg.h> 102#include <machine/psl.h> 103#include <machine/clock.h> 104#include <machine/specialreg.h> 105#include <machine/sysarch.h> 106#include <machine/cons.h> 107#include <machine/devconf.h> 108#include <machine/bootinfo.h> 109#include <machine/md_var.h> 110 111#include <i386/isa/isa.h> 112#include <i386/isa/isa_device.h> 113#include <i386/isa/rtc.h> 114#include <machine/random.h> 115 116extern void init386 __P((int first)); 117extern int ptrace_set_pc __P((struct proc *p, unsigned int addr)); 118extern int ptrace_single_step __P((struct proc *p)); 119extern int ptrace_write_u __P((struct proc *p, vm_offset_t off, int data)); 120extern void dblfault_handler __P((void)); 121 122extern void i486_bzero __P((void *, size_t)); 123extern void i586_bzero __P((void *, size_t)); 124extern void i686_bzero __P((void *, size_t)); 125 126static void cpu_startup __P((void *)); 127SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL) 128 129static void identifycpu(void); 130 131char machine[] = "i386"; 132SYSCTL_STRING(_hw, HW_MACHINE, machine, CTLFLAG_RD, machine, 0, ""); 133 134static char cpu_model[128]; 135SYSCTL_STRING(_hw, HW_MODEL, model, CTLFLAG_RD, cpu_model, 0, ""); 136 137struct kern_devconf kdc_cpu0 = { 138 0, 0, 0, /* filled in by dev_attach */ 139 "cpu", 0, { MDDT_CPU }, 140 0, 0, 0, CPU_EXTERNALLEN, 141 0, /* CPU has no parent */ 142 0, /* no parentdata */ 143 DC_BUSY, /* the CPU is always busy */ 144 cpu_model, /* no sense in duplication */ 145 DC_CLS_CPU /* class */ 146}; 147 148#ifndef PANIC_REBOOT_WAIT_TIME 149#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 150#endif 151 152#ifdef BOUNCE_BUFFERS 153extern char *bouncememory; 154extern int maxbkva; 155#ifdef BOUNCEPAGES 156int bouncepages = BOUNCEPAGES; 157#else 158int bouncepages = 0; 159#endif 160#endif /* BOUNCE_BUFFERS */ 161 162extern int freebufspace; 163int msgbufmapped = 0; /* set when safe to use msgbuf */ 164int _udatasel, _ucodesel; 165 166 167int physmem = 0; 168 169static int 170sysctl_hw_physmem SYSCTL_HANDLER_ARGS 171{ 172 int error = sysctl_handle_int(oidp, 0, ctob(physmem), req); 173 return (error); 174} 175 176SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_INT|CTLFLAG_RD, 177 0, 0, sysctl_hw_physmem, "I", ""); 178 179static int 180sysctl_hw_usermem SYSCTL_HANDLER_ARGS 181{ 182 int error = sysctl_handle_int(oidp, 0, 183 ctob(physmem - cnt.v_wire_count), req); 184 return (error); 185} 186 187SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD, 188 0, 0, sysctl_hw_usermem, "I", ""); 189 190int boothowto = 0, bootverbose = 0, Maxmem = 0; 191static int badpages = 0; 192long dumplo; 193extern int bootdev; 194 195vm_offset_t phys_avail[10]; 196 197/* must be 2 less so 0 0 can signal end of chunks */ 198#define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(vm_offset_t)) - 2) 199 200int cpu_class; 201 202static void dumpsys __P((void)); 203static void setup_netisrs __P((struct linker_set *)); /* XXX declare elsewhere */ 204 205static vm_offset_t buffer_sva, buffer_eva; 206vm_offset_t clean_sva, clean_eva; 207static vm_offset_t pager_sva, pager_eva; 208extern struct linker_set netisr_set; 209 210#define offsetof(type, member) ((size_t)(&((type *)0)->member)) 211 212static void 213cpu_startup(dummy) 214 void *dummy; 215{ 216 register unsigned i; 217 register caddr_t v; 218 vm_offset_t maxaddr; 219 vm_size_t size = 0; 220 int firstaddr; 221 vm_offset_t minaddr; 222 223 if (boothowto & RB_VERBOSE) 224 bootverbose++; 225 226 /* 227 * Initialize error message buffer (at end of core). 228 */ 229 230 /* avail_end was pre-decremented in init_386() to compensate */ 231 for (i = 0; i < btoc(sizeof (struct msgbuf)); i++) 232 pmap_enter(pmap_kernel(), (vm_offset_t)msgbufp, 233 avail_end + i * NBPG, 234 VM_PROT_ALL, TRUE); 235 msgbufmapped = 1; 236 237 /* 238 * Good {morning,afternoon,evening,night}. 239 */ 240 printf(version); 241 startrtclock(); 242 identifycpu(); 243 printf("real memory = %d (%dK bytes)\n", ptoa(Maxmem), ptoa(Maxmem) / 1024); 244 /* 245 * Display any holes after the first chunk of extended memory. 246 */ 247 if (badpages != 0) { 248 int indx = 1; 249 250 /* 251 * XXX skip reporting ISA hole & unmanaged kernel memory 252 */ 253 if (phys_avail[0] == PAGE_SIZE) 254 indx += 2; 255 256 printf("Physical memory hole(s):\n"); 257 for (; phys_avail[indx + 1] != 0; indx += 2) { 258 int size = phys_avail[indx + 1] - phys_avail[indx]; 259 260 printf("0x%08lx - 0x%08lx, %d bytes (%d pages)\n", phys_avail[indx], 261 phys_avail[indx + 1] - 1, size, size / PAGE_SIZE); 262 } 263 } 264 265 /* 266 * Quickly wire in netisrs. 267 */ 268 setup_netisrs(&netisr_set); 269 270/* 271#ifdef ISDN 272 DONET(isdnintr, NETISR_ISDN); 273#endif 274*/ 275 276 /* 277 * Allocate space for system data structures. 278 * The first available kernel virtual address is in "v". 279 * As pages of kernel virtual memory are allocated, "v" is incremented. 280 * As pages of memory are allocated and cleared, 281 * "firstaddr" is incremented. 282 * An index into the kernel page table corresponding to the 283 * virtual memory address maintained in "v" is kept in "mapaddr". 284 */ 285 286 /* 287 * Make two passes. The first pass calculates how much memory is 288 * needed and allocates it. The second pass assigns virtual 289 * addresses to the various data structures. 290 */ 291 firstaddr = 0; 292again: 293 v = (caddr_t)firstaddr; 294 295#define valloc(name, type, num) \ 296 (name) = (type *)v; v = (caddr_t)((name)+(num)) 297#define valloclim(name, type, num, lim) \ 298 (name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num))) 299 valloc(callout, struct callout, ncallout); 300#ifdef SYSVSHM 301 valloc(shmsegs, struct shmid_ds, shminfo.shmmni); 302#endif 303#ifdef SYSVSEM 304 valloc(sema, struct semid_ds, seminfo.semmni); 305 valloc(sem, struct sem, seminfo.semmns); 306 /* This is pretty disgusting! */ 307 valloc(semu, int, (seminfo.semmnu * seminfo.semusz) / sizeof(int)); 308#endif 309#ifdef SYSVMSG 310 valloc(msgpool, char, msginfo.msgmax); 311 valloc(msgmaps, struct msgmap, msginfo.msgseg); 312 valloc(msghdrs, struct msg, msginfo.msgtql); 313 valloc(msqids, struct msqid_ds, msginfo.msgmni); 314#endif 315 316 if (nbuf == 0) { 317 nbuf = 30; 318 if( physmem > 1024) 319 nbuf += min((physmem - 1024) / 12, 1024); 320 } 321 nswbuf = min(nbuf, 128); 322 323 valloc(swbuf, struct buf, nswbuf); 324 valloc(buf, struct buf, nbuf); 325 326#ifdef BOUNCE_BUFFERS 327 /* 328 * If there is more than 16MB of memory, allocate some bounce buffers 329 */ 330 if (Maxmem > 4096) { 331 if (bouncepages == 0) { 332 bouncepages = 64; 333 bouncepages += ((Maxmem - 4096) / 2048) * 32; 334 } 335 v = (caddr_t)((vm_offset_t)((vm_offset_t)v + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1)); 336 valloc(bouncememory, char, bouncepages * PAGE_SIZE); 337 } 338#endif 339 340 /* 341 * End of first pass, size has been calculated so allocate memory 342 */ 343 if (firstaddr == 0) { 344 size = (vm_size_t)(v - firstaddr); 345 firstaddr = (int)kmem_alloc(kernel_map, round_page(size)); 346 if (firstaddr == 0) 347 panic("startup: no room for tables"); 348 goto again; 349 } 350 351 /* 352 * End of second pass, addresses have been assigned 353 */ 354 if ((vm_size_t)(v - firstaddr) != size) 355 panic("startup: table size inconsistency"); 356 357#ifdef BOUNCE_BUFFERS 358 clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva, 359 (nbuf*MAXBSIZE) + (nswbuf*MAXPHYS) + 360 maxbkva + pager_map_size, TRUE); 361 io_map = kmem_suballoc(clean_map, &minaddr, &maxaddr, maxbkva, FALSE); 362#else 363 clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva, 364 (nbuf*MAXBSIZE) + (nswbuf*MAXPHYS) + pager_map_size, TRUE); 365#endif 366 buffer_map = kmem_suballoc(clean_map, &buffer_sva, &buffer_eva, 367 (nbuf*MAXBSIZE), TRUE); 368 pager_map = kmem_suballoc(clean_map, &pager_sva, &pager_eva, 369 (nswbuf*MAXPHYS) + pager_map_size, TRUE); 370 exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, 371 (16*ARG_MAX), TRUE); 372 u_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, 373 (maxproc*UPAGES*PAGE_SIZE), FALSE); 374 375 /* 376 * Finally, allocate mbuf pool. Since mclrefcnt is an off-size 377 * we use the more space efficient malloc in place of kmem_alloc. 378 */ 379 mclrefcnt = (char *)malloc(nmbclusters+CLBYTES/MCLBYTES, 380 M_MBUF, M_NOWAIT); 381 bzero(mclrefcnt, nmbclusters+CLBYTES/MCLBYTES); 382 mb_map = kmem_suballoc(kmem_map, (vm_offset_t *)&mbutl, &maxaddr, 383 nmbclusters * MCLBYTES, FALSE); 384 /* 385 * Initialize callouts 386 */ 387 callfree = callout; 388 for (i = 1; i < ncallout; i++) 389 callout[i-1].c_next = &callout[i]; 390 391 if (boothowto & RB_CONFIG) { 392 userconfig(); 393 cninit(); /* the preferred console may have changed */ 394 } 395 396#ifdef BOUNCE_BUFFERS 397 /* 398 * init bounce buffers 399 */ 400 vm_bounce_init(); 401#endif 402 /* 403 * XXX allocate a contiguous area for ISA (non busmaster) DMA 404 * operations. This _should_ only be done if the DMA channels 405 * will actually be used, but for now we do it always. 406 */ 407#define DMAPAGES 8 408 isaphysmem = 409 vm_page_alloc_contig(DMAPAGES * PAGE_SIZE, 0, 0xfffffful, 64*1024); 410 411 printf("avail memory = %d (%dK bytes)\n", ptoa(cnt.v_free_count), 412 ptoa(cnt.v_free_count) / 1024); 413 414 /* 415 * Set up buffers, so they can be used to read disk labels. 416 */ 417 bufinit(); 418 vm_pager_bufferinit(); 419 420 /* 421 * In verbose mode, print out the BIOS's idea of the disk geometries. 422 */ 423 if (bootverbose) { 424 printf("BIOS Geometries:\n"); 425 for (i = 0; i < N_BIOS_GEOM; i++) { 426 unsigned long bios_geom; 427 int max_cylinder, max_head, max_sector; 428 429 bios_geom = bootinfo.bi_bios_geom[i]; 430 431 /* 432 * XXX the bootstrap punts a 1200K floppy geometry 433 * when the get-disk-geometry interrupt fails. Skip 434 * drives that have this geometry. 435 */ 436 if (bios_geom == 0x4f010f) 437 continue; 438 439 printf(" %x:%08lx ", i, bios_geom); 440 max_cylinder = bios_geom >> 16; 441 max_head = (bios_geom >> 8) & 0xff; 442 max_sector = bios_geom & 0xff; 443 printf( 444 "0..%d=%d cylinders, 0..%d=%d heads, 1..%d=%d sectors\n", 445 max_cylinder, max_cylinder + 1, 446 max_head, max_head + 1, 447 max_sector, max_sector); 448 } 449 printf(" %d accounted for\n", bootinfo.bi_n_bios_used); 450 } 451} 452 453int 454register_netisr(num, handler) 455 int num; 456 netisr_t *handler; 457{ 458 459 if (num < 0 || num >= (sizeof(netisrs)/sizeof(*netisrs)) ) { 460 printf("register_netisr: bad isr number: %d\n", num); 461 return (EINVAL); 462 } 463 netisrs[num] = handler; 464 return (0); 465} 466 467static void 468setup_netisrs(ls) 469 struct linker_set *ls; 470{ 471 int i; 472 const struct netisrtab *nit; 473 474 for(i = 0; ls->ls_items[i]; i++) { 475 nit = (const struct netisrtab *)ls->ls_items[i]; 476 register_netisr(nit->nit_num, nit->nit_isr); 477 } 478} 479 480static struct cpu_nameclass i386_cpus[] = { 481 { "Intel 80286", CPUCLASS_286 }, /* CPU_286 */ 482 { "i386SX", CPUCLASS_386 }, /* CPU_386SX */ 483 { "i386DX", CPUCLASS_386 }, /* CPU_386 */ 484 { "i486SX", CPUCLASS_486 }, /* CPU_486SX */ 485 { "i486DX", CPUCLASS_486 }, /* CPU_486 */ 486 { "Pentium", CPUCLASS_586 }, /* CPU_586 */ 487 { "Cy486DLC", CPUCLASS_486 }, /* CPU_486DLC */ 488 { "Pentium Pro", CPUCLASS_686 }, /* CPU_686 */ 489}; 490 491static void 492identifycpu() 493{ 494 printf("CPU: "); 495 if (cpu >= 0 496 && cpu < (sizeof i386_cpus/sizeof(struct cpu_nameclass))) { 497 cpu_class = i386_cpus[cpu].cpu_class; 498 strncpy(cpu_model, i386_cpus[cpu].cpu_name, sizeof cpu_model); 499 } else { 500 printf("unknown cpu type %d\n", cpu); 501 panic("startup: bad cpu id"); 502 } 503 504#if defined(I586_CPU) || defined(I686_CPU) 505 if (cpu_class == CPUCLASS_586 || cpu_class == CPUCLASS_686) { 506 calibrate_cyclecounter(); 507 } 508#endif 509#if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU) 510 if (!strcmp(cpu_vendor,"GenuineIntel")) { 511 if ((cpu_id & 0xf00) > 3) { 512 cpu_model[0] = '\0'; 513 514 switch (cpu_id & 0x3000) { 515 case 0x1000: 516 strcpy(cpu_model, "Overdrive "); 517 break; 518 case 0x2000: 519 strcpy(cpu_model, "Dual "); 520 break; 521 } 522 523 switch (cpu_id & 0xf00) { 524 case 0x400: 525 strcat(cpu_model, "i486 "); 526 break; 527 case 0x500: 528 strcat(cpu_model, "Pentium"); /* nb no space */ 529 break; 530 case 0x600: 531 strcat(cpu_model, "Pentium Pro"); 532 break; 533 default: 534 strcat(cpu_model, "unknown"); 535 break; 536 } 537 538 switch (cpu_id & 0xff0) { 539 case 0x400: 540 strcat(cpu_model, "DX"); break; 541 case 0x410: 542 strcat(cpu_model, "DX"); break; 543 case 0x420: 544 strcat(cpu_model, "SX"); break; 545 case 0x430: 546 strcat(cpu_model, "DX2"); break; 547 case 0x440: 548 strcat(cpu_model, "SL"); break; 549 case 0x450: 550 strcat(cpu_model, "SX2"); break; 551 case 0x470: 552 strcat(cpu_model, "DX2 Write-Back Enhanced"); 553 break; 554 case 0x480: 555 strcat(cpu_model, "DX4"); break; 556 break; 557 } 558 } 559 } 560#endif 561 printf("%s (", cpu_model); 562 switch(cpu_class) { 563 case CPUCLASS_286: 564 printf("286"); 565 break; 566#if defined(I386_CPU) 567 case CPUCLASS_386: 568 printf("386"); 569 break; 570#endif 571#if defined(I486_CPU) 572 case CPUCLASS_486: 573 printf("486"); 574 bzero = i486_bzero; 575 break; 576#endif 577#if defined(I586_CPU) 578 case CPUCLASS_586: 579 printf("%d.%02d-MHz ", 580 ((100 * i586_ctr_rate) >> I586_CTR_RATE_SHIFT) / 100, 581 ((100 * i586_ctr_rate) >> I586_CTR_RATE_SHIFT) % 100); 582 printf("586"); 583 bzero = i586_bzero; 584 break; 585#endif 586#if defined(I686_CPU) 587 case CPUCLASS_686: 588 printf("%d.%02d-MHz ", 589 ((100 * i586_ctr_rate) >> I586_CTR_RATE_SHIFT) / 100, 590 ((100 * i586_ctr_rate) >> I586_CTR_RATE_SHIFT) % 100); 591 printf("686"); 592 bzero = i686_bzero; 593 break; 594#endif 595 default: 596 printf("unknown"); /* will panic below... */ 597 } 598 printf("-class CPU)\n"); 599#if defined(I486_CPU) || defined(I586_CPU) || defined(I686_CPU) 600 if(*cpu_vendor) 601 printf(" Origin = \"%s\"",cpu_vendor); 602 if(cpu_id) 603 printf(" Id = 0x%lx",cpu_id); 604 605 if (!strcmp(cpu_vendor, "GenuineIntel")) { 606 printf(" Stepping=%ld", cpu_id & 0xf); 607 if (cpu_high > 0) { 608#define FEATUREFMT "\020\001FPU\002VME\003PSE\004MCE\005CX8\006APIC" 609 printf("\n Features=0x%b", cpu_feature, FEATUREFMT); 610 } 611 } 612 /* Avoid ugly blank lines: only print newline when we have to. */ 613 if (*cpu_vendor || cpu_id) 614 printf("\n"); 615#endif 616 /* 617 * Now that we have told the user what they have, 618 * let them know if that machine type isn't configured. 619 */ 620 switch (cpu_class) { 621 case CPUCLASS_286: /* a 286 should not make it this far, anyway */ 622#if !defined(I386_CPU) && !defined(I486_CPU) && !defined(I586_CPU) && !defined(I686_CPU) 623#error This kernel is not configured for one of the supported CPUs 624#endif 625#if !defined(I386_CPU) 626 case CPUCLASS_386: 627#endif 628#if !defined(I486_CPU) 629 case CPUCLASS_486: 630#endif 631#if !defined(I586_CPU) 632 case CPUCLASS_586: 633#endif 634#if !defined(I686_CPU) 635 case CPUCLASS_686: 636#endif 637 panic("CPU class not configured"); 638 default: 639 break; 640 } 641 dev_attach(&kdc_cpu0); 642} 643 644/* 645 * Send an interrupt to process. 646 * 647 * Stack is set up to allow sigcode stored 648 * in u. to call routine, followed by kcall 649 * to sigreturn routine below. After sigreturn 650 * resets the signal mask, the stack, and the 651 * frame pointer, it returns to the user 652 * specified pc, psl. 653 */ 654void 655sendsig(catcher, sig, mask, code) 656 sig_t catcher; 657 int sig, mask; 658 unsigned code; 659{ 660 register struct proc *p = curproc; 661 register int *regs; 662 register struct sigframe *fp; 663 struct sigframe sf; 664 struct sigacts *psp = p->p_sigacts; 665 int oonstack; 666 667 regs = p->p_md.md_regs; 668 oonstack = psp->ps_sigstk.ss_flags & SA_ONSTACK; 669 /* 670 * Allocate and validate space for the signal handler 671 * context. Note that if the stack is in P0 space, the 672 * call to grow() is a nop, and the useracc() check 673 * will fail if the process has not already allocated 674 * the space with a `brk'. 675 */ 676 if ((psp->ps_flags & SAS_ALTSTACK) && 677 (psp->ps_sigstk.ss_flags & SA_ONSTACK) == 0 && 678 (psp->ps_sigonstack & sigmask(sig))) { 679 fp = (struct sigframe *)(psp->ps_sigstk.ss_sp + 680 psp->ps_sigstk.ss_size - sizeof(struct sigframe)); 681 psp->ps_sigstk.ss_flags |= SA_ONSTACK; 682 } else { 683 fp = (struct sigframe *)(regs[tESP] 684 - sizeof(struct sigframe)); 685 } 686 687 /* 688 * grow() will return FALSE if the fp will not fit inside the stack 689 * and the stack can not be grown. useracc will return FALSE 690 * if access is denied. 691 */ 692 if ((grow(p, (int)fp) == FALSE) || 693 (useracc((caddr_t)fp, sizeof (struct sigframe), B_WRITE) == FALSE)) { 694 /* 695 * Process has trashed its stack; give it an illegal 696 * instruction to halt it in its tracks. 697 */ 698 SIGACTION(p, SIGILL) = SIG_DFL; 699 sig = sigmask(SIGILL); 700 p->p_sigignore &= ~sig; 701 p->p_sigcatch &= ~sig; 702 p->p_sigmask &= ~sig; 703 psignal(p, SIGILL); 704 return; 705 } 706 707 /* 708 * Build the argument list for the signal handler. 709 */ 710 if (p->p_sysent->sv_sigtbl) { 711 if (sig < p->p_sysent->sv_sigsize) 712 sig = p->p_sysent->sv_sigtbl[sig]; 713 else 714 sig = p->p_sysent->sv_sigsize + 1; 715 } 716 sf.sf_signum = sig; 717 sf.sf_code = code; 718 sf.sf_scp = &fp->sf_sc; 719 sf.sf_addr = (char *) regs[tERR]; 720 sf.sf_handler = catcher; 721 722 /* save scratch registers */ 723 sf.sf_sc.sc_eax = regs[tEAX]; 724 sf.sf_sc.sc_ebx = regs[tEBX]; 725 sf.sf_sc.sc_ecx = regs[tECX]; 726 sf.sf_sc.sc_edx = regs[tEDX]; 727 sf.sf_sc.sc_esi = regs[tESI]; 728 sf.sf_sc.sc_edi = regs[tEDI]; 729 sf.sf_sc.sc_cs = regs[tCS]; 730 sf.sf_sc.sc_ds = regs[tDS]; 731 sf.sf_sc.sc_ss = regs[tSS]; 732 sf.sf_sc.sc_es = regs[tES]; 733 sf.sf_sc.sc_isp = regs[tISP]; 734 735 /* 736 * Build the signal context to be used by sigreturn. 737 */ 738 sf.sf_sc.sc_onstack = oonstack; 739 sf.sf_sc.sc_mask = mask; 740 sf.sf_sc.sc_sp = regs[tESP]; 741 sf.sf_sc.sc_fp = regs[tEBP]; 742 sf.sf_sc.sc_pc = regs[tEIP]; 743 sf.sf_sc.sc_ps = regs[tEFLAGS]; 744 745 /* 746 * Copy the sigframe out to the user's stack. 747 */ 748 if (copyout(&sf, fp, sizeof(struct sigframe)) != 0) { 749 /* 750 * Something is wrong with the stack pointer. 751 * ...Kill the process. 752 */ 753 sigexit(p, SIGILL); 754 }; 755 756 regs[tESP] = (int)fp; 757 regs[tEIP] = (int)((struct pcb *)kstack)->pcb_sigc; 758 regs[tEFLAGS] &= ~PSL_VM; 759 regs[tCS] = _ucodesel; 760 regs[tDS] = _udatasel; 761 regs[tES] = _udatasel; 762 regs[tSS] = _udatasel; 763} 764 765/* 766 * System call to cleanup state after a signal 767 * has been taken. Reset signal mask and 768 * stack state from context left by sendsig (above). 769 * Return to previous pc and psl as specified by 770 * context left by sendsig. Check carefully to 771 * make sure that the user has not modified the 772 * state to gain improper privileges. 773 */ 774int 775sigreturn(p, uap, retval) 776 struct proc *p; 777 struct sigreturn_args /* { 778 struct sigcontext *sigcntxp; 779 } */ *uap; 780 int *retval; 781{ 782 register struct sigcontext *scp; 783 register struct sigframe *fp; 784 register int *regs = p->p_md.md_regs; 785 int eflags; 786 787 /* 788 * (XXX old comment) regs[tESP] points to the return address. 789 * The user scp pointer is above that. 790 * The return address is faked in the signal trampoline code 791 * for consistency. 792 */ 793 scp = uap->sigcntxp; 794 fp = (struct sigframe *) 795 ((caddr_t)scp - offsetof(struct sigframe, sf_sc)); 796 797 if (useracc((caddr_t)fp, sizeof (*fp), 0) == 0) 798 return(EINVAL); 799 800 /* 801 * Don't allow users to change privileged or reserved flags. 802 */ 803#define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 804 eflags = scp->sc_ps; 805 /* 806 * XXX do allow users to change the privileged flag PSL_RF. The 807 * cpu sets PSL_RF in tf_eflags for faults. Debuggers should 808 * sometimes set it there too. tf_eflags is kept in the signal 809 * context during signal handling and there is no other place 810 * to remember it, so the PSL_RF bit may be corrupted by the 811 * signal handler without us knowing. Corruption of the PSL_RF 812 * bit at worst causes one more or one less debugger trap, so 813 * allowing it is fairly harmless. 814 */ 815 if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs[tEFLAGS] & ~PSL_RF)) { 816#ifdef DEBUG 817 printf("sigreturn: eflags = 0x%x\n", eflags); 818#endif 819 return(EINVAL); 820 } 821 822 /* 823 * Don't allow users to load a valid privileged %cs. Let the 824 * hardware check for invalid selectors, excess privilege in 825 * other selectors, invalid %eip's and invalid %esp's. 826 */ 827#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 828 if (!CS_SECURE(scp->sc_cs)) { 829#ifdef DEBUG 830 printf("sigreturn: cs = 0x%x\n", scp->sc_cs); 831#endif 832 trapsignal(p, SIGBUS, T_PROTFLT); 833 return(EINVAL); 834 } 835 836 /* restore scratch registers */ 837 regs[tEAX] = scp->sc_eax; 838 regs[tEBX] = scp->sc_ebx; 839 regs[tECX] = scp->sc_ecx; 840 regs[tEDX] = scp->sc_edx; 841 regs[tESI] = scp->sc_esi; 842 regs[tEDI] = scp->sc_edi; 843 regs[tCS] = scp->sc_cs; 844 regs[tDS] = scp->sc_ds; 845 regs[tES] = scp->sc_es; 846 regs[tSS] = scp->sc_ss; 847 regs[tISP] = scp->sc_isp; 848 849 if (useracc((caddr_t)scp, sizeof (*scp), 0) == 0) 850 return(EINVAL); 851 852 if (scp->sc_onstack & 01) 853 p->p_sigacts->ps_sigstk.ss_flags |= SA_ONSTACK; 854 else 855 p->p_sigacts->ps_sigstk.ss_flags &= ~SA_ONSTACK; 856 p->p_sigmask = scp->sc_mask &~ 857 (sigmask(SIGKILL)|sigmask(SIGCONT)|sigmask(SIGSTOP)); 858 regs[tEBP] = scp->sc_fp; 859 regs[tESP] = scp->sc_sp; 860 regs[tEIP] = scp->sc_pc; 861 regs[tEFLAGS] = eflags; 862 return(EJUSTRETURN); 863} 864 865static int waittime = -1; 866static struct pcb dumppcb; 867 868__dead void 869boot(howto) 870 int howto; 871{ 872 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 873 register struct buf *bp; 874 int iter, nbusy; 875 876 waittime = 0; 877 printf("\nsyncing disks... "); 878 879 sync(&proc0, NULL, NULL); 880 881 for (iter = 0; iter < 20; iter++) { 882 nbusy = 0; 883 for (bp = &buf[nbuf]; --bp >= buf; ) { 884 if ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) { 885 nbusy++; 886 } 887 } 888 if (nbusy == 0) 889 break; 890 printf("%d ", nbusy); 891 DELAY(40000 * iter); 892 } 893 if (nbusy) { 894 /* 895 * Failed to sync all blocks. Indicate this and don't 896 * unmount filesystems (thus forcing an fsck on reboot). 897 */ 898 printf("giving up\n"); 899#ifdef SHOW_BUSYBUFS 900 nbusy = 0; 901 for (bp = &buf[nbuf]; --bp >= buf; ) { 902 if ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) { 903 nbusy++; 904 printf("%d: dev:%08x, flags:%08x, blkno:%d, lblkno:%d\n", nbusy, bp->b_dev, bp->b_flags, bp->b_blkno, bp->b_lblkno); 905 } 906 } 907 DELAY(5000000); /* 5 seconds */ 908#endif 909 } else { 910 printf("done\n"); 911 /* 912 * Unmount filesystems 913 */ 914 if (panicstr == 0) 915 vfs_unmountall(); 916 } 917 DELAY(100000); /* wait for console output to finish */ 918 dev_shutdownall(FALSE); 919 } 920 splhigh(); 921 if (howto & RB_HALT) { 922 printf("\n"); 923 printf("The operating system has halted.\n"); 924 printf("Please press any key to reboot.\n\n"); 925 cngetc(); 926 } else { 927 if (howto & RB_DUMP) { 928 if (!cold) { 929 savectx(&dumppcb, 0); 930 dumppcb.pcb_ptd = rcr3(); 931 dumpsys(); 932 } 933 934 if (PANIC_REBOOT_WAIT_TIME != 0) { 935 if (PANIC_REBOOT_WAIT_TIME != -1) { 936 int loop; 937 printf("Automatic reboot in %d seconds - press a key on the console to abort\n", 938 PANIC_REBOOT_WAIT_TIME); 939 for (loop = PANIC_REBOOT_WAIT_TIME * 10; loop > 0; --loop) { 940 DELAY(1000 * 100); /* 1/10th second */ 941 if (cncheckc()) /* Did user type a key? */ 942 break; 943 } 944 if (!loop) 945 goto die; 946 } 947 } else { /* zero time specified - reboot NOW */ 948 goto die; 949 } 950 printf("--> Press a key on the console to reboot <--\n"); 951 cngetc(); 952 } 953 } 954die: 955 printf("Rebooting...\n"); 956 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 957 cpu_reset(); 958 for(;;) ; 959 /* NOTREACHED */ 960} 961 962/* 963 * Magic number for savecore 964 * 965 * exported (symorder) and used at least by savecore(8) 966 * 967 */ 968u_long dumpmag = 0x8fca0101UL; 969 970static int dumpsize = 0; /* also for savecore */ 971 972static int dodump = 1; 973SYSCTL_INT(_machdep, OID_AUTO, do_dump, CTLFLAG_RW, &dodump, 0, ""); 974 975/* 976 * Doadump comes here after turning off memory management and 977 * getting on the dump stack, either when called above, or by 978 * the auto-restart code. 979 */ 980static void 981dumpsys() 982{ 983 984 if (!dodump) 985 return; 986 if (dumpdev == NODEV) 987 return; 988 if ((minor(dumpdev)&07) != 1) 989 return; 990 if (!(bdevsw[major(dumpdev)])) 991 return; 992 if (!(bdevsw[major(dumpdev)]->d_dump)) 993 return; 994 dumpsize = Maxmem; 995 printf("\ndumping to dev %lx, offset %ld\n", dumpdev, dumplo); 996 printf("dump "); 997 switch ((*bdevsw[major(dumpdev)]->d_dump)(dumpdev)) { 998 999 case ENXIO: 1000 printf("device bad\n"); 1001 break; 1002 1003 case EFAULT: 1004 printf("device not ready\n"); 1005 break; 1006 1007 case EINVAL: 1008 printf("area improper\n"); 1009 break; 1010 1011 case EIO: 1012 printf("i/o error\n"); 1013 break; 1014 1015 case EINTR: 1016 printf("aborted from console\n"); 1017 break; 1018 1019 default: 1020 printf("succeeded\n"); 1021 break; 1022 } 1023} 1024 1025/* 1026 * Clear registers on exec 1027 */ 1028void 1029setregs(p, entry, stack) 1030 struct proc *p; 1031 u_long entry; 1032 u_long stack; 1033{ 1034 int *regs = p->p_md.md_regs; 1035 1036 bzero(regs, sizeof(struct trapframe)); 1037 regs[tEIP] = entry; 1038 regs[tESP] = stack; 1039 regs[tEFLAGS] = PSL_USER | (regs[tEFLAGS] & PSL_T); 1040 regs[tSS] = _udatasel; 1041 regs[tDS] = _udatasel; 1042 regs[tES] = _udatasel; 1043 regs[tCS] = _ucodesel; 1044 1045 p->p_addr->u_pcb.pcb_flags = 0; /* no fp at all */ 1046 load_cr0(rcr0() | CR0_TS); /* start emulating */ 1047#if NNPX > 0 1048 npxinit(__INITIAL_NPXCW__); 1049#endif /* NNPX > 0 */ 1050} 1051 1052static int 1053sysctl_machdep_adjkerntz SYSCTL_HANDLER_ARGS 1054{ 1055 int error; 1056 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 1057 req); 1058 if (!error && req->newptr) 1059 resettodr(); 1060 return (error); 1061} 1062 1063SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 1064 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 1065 1066SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, 1067 CTLFLAG_RW, &disable_rtc_set, 0, ""); 1068 1069SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo, 1070 CTLFLAG_RD, &bootinfo, bootinfo, ""); 1071 1072/* 1073 * Initialize 386 and configure to run kernel 1074 */ 1075 1076/* 1077 * Initialize segments & interrupt table 1078 */ 1079 1080int currentldt; 1081int _default_ldt; 1082union descriptor gdt[NGDT]; /* global descriptor table */ 1083struct gate_descriptor idt[NIDT]; /* interrupt descriptor table */ 1084union descriptor ldt[NLDT]; /* local descriptor table */ 1085 1086static struct i386tss dblfault_tss; 1087static char dblfault_stack[PAGE_SIZE]; 1088 1089extern struct user *proc0paddr; 1090 1091/* software prototypes -- in more palatable form */ 1092struct soft_segment_descriptor gdt_segs[] = { 1093/* GNULL_SEL 0 Null Descriptor */ 1094{ 0x0, /* segment base address */ 1095 0x0, /* length */ 1096 0, /* segment type */ 1097 0, /* segment descriptor priority level */ 1098 0, /* segment descriptor present */ 1099 0, 0, 1100 0, /* default 32 vs 16 bit size */ 1101 0 /* limit granularity (byte/page units)*/ }, 1102/* GCODE_SEL 1 Code Descriptor for kernel */ 1103{ 0x0, /* segment base address */ 1104 0xfffff, /* length - all address space */ 1105 SDT_MEMERA, /* segment type */ 1106 0, /* segment descriptor priority level */ 1107 1, /* segment descriptor present */ 1108 0, 0, 1109 1, /* default 32 vs 16 bit size */ 1110 1 /* limit granularity (byte/page units)*/ }, 1111/* GDATA_SEL 2 Data Descriptor for kernel */ 1112{ 0x0, /* segment base address */ 1113 0xfffff, /* length - all address space */ 1114 SDT_MEMRWA, /* segment type */ 1115 0, /* segment descriptor priority level */ 1116 1, /* segment descriptor present */ 1117 0, 0, 1118 1, /* default 32 vs 16 bit size */ 1119 1 /* limit granularity (byte/page units)*/ }, 1120/* GLDT_SEL 3 LDT Descriptor */ 1121{ (int) ldt, /* segment base address */ 1122 sizeof(ldt)-1, /* length - all address space */ 1123 SDT_SYSLDT, /* 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/* GTGATE_SEL 4 Null Descriptor - Placeholder */ 1130{ 0x0, /* segment base address */ 1131 0x0, /* length - all address space */ 1132 0, /* segment type */ 1133 0, /* segment descriptor priority level */ 1134 0, /* segment descriptor present */ 1135 0, 0, 1136 0, /* default 32 vs 16 bit size */ 1137 0 /* limit granularity (byte/page units)*/ }, 1138/* GPANIC_SEL 5 Panic Tss Descriptor */ 1139{ (int) &dblfault_tss, /* segment base address */ 1140 sizeof(struct i386tss)-1,/* length - all address space */ 1141 SDT_SYS386TSS, /* segment type */ 1142 0, /* segment descriptor priority level */ 1143 1, /* segment descriptor present */ 1144 0, 0, 1145 0, /* unused - default 32 vs 16 bit size */ 1146 0 /* limit granularity (byte/page units)*/ }, 1147/* GPROC0_SEL 6 Proc 0 Tss Descriptor */ 1148{ (int) kstack, /* segment base address */ 1149 sizeof(struct i386tss)-1,/* length - all address space */ 1150 SDT_SYS386TSS, /* segment type */ 1151 0, /* segment descriptor priority level */ 1152 1, /* segment descriptor present */ 1153 0, 0, 1154 0, /* unused - default 32 vs 16 bit size */ 1155 0 /* limit granularity (byte/page units)*/ }, 1156/* GUSERLDT_SEL 7 User LDT Descriptor per process */ 1157{ (int) ldt, /* segment base address */ 1158 (512 * sizeof(union descriptor)-1), /* length */ 1159 SDT_SYSLDT, /* segment type */ 1160 0, /* segment descriptor priority level */ 1161 1, /* segment descriptor present */ 1162 0, 0, 1163 0, /* unused - default 32 vs 16 bit size */ 1164 0 /* limit granularity (byte/page units)*/ }, 1165/* GAPMCODE32_SEL 8 APM BIOS 32-bit interface (32bit Code) */ 1166{ 0, /* segment base address (overwritten by APM) */ 1167 0xfffff, /* length */ 1168 SDT_MEMERA, /* segment type */ 1169 0, /* segment descriptor priority level */ 1170 1, /* segment descriptor present */ 1171 0, 0, 1172 1, /* default 32 vs 16 bit size */ 1173 1 /* limit granularity (byte/page units)*/ }, 1174/* GAPMCODE16_SEL 9 APM BIOS 32-bit interface (16bit Code) */ 1175{ 0, /* segment base address (overwritten by APM) */ 1176 0xfffff, /* length */ 1177 SDT_MEMERA, /* segment type */ 1178 0, /* segment descriptor priority level */ 1179 1, /* segment descriptor present */ 1180 0, 0, 1181 0, /* default 32 vs 16 bit size */ 1182 1 /* limit granularity (byte/page units)*/ }, 1183/* GAPMDATA_SEL 10 APM BIOS 32-bit interface (Data) */ 1184{ 0, /* segment base address (overwritten by APM) */ 1185 0xfffff, /* length */ 1186 SDT_MEMRWA, /* segment type */ 1187 0, /* segment descriptor priority level */ 1188 1, /* segment descriptor present */ 1189 0, 0, 1190 1, /* default 32 vs 16 bit size */ 1191 1 /* limit granularity (byte/page units)*/ }, 1192}; 1193 1194static struct soft_segment_descriptor ldt_segs[] = { 1195 /* Null Descriptor - overwritten by call gate */ 1196{ 0x0, /* segment base address */ 1197 0x0, /* length - all address space */ 1198 0, /* segment type */ 1199 0, /* segment descriptor priority level */ 1200 0, /* segment descriptor present */ 1201 0, 0, 1202 0, /* default 32 vs 16 bit size */ 1203 0 /* limit granularity (byte/page units)*/ }, 1204 /* Null Descriptor - overwritten by call gate */ 1205{ 0x0, /* segment base address */ 1206 0x0, /* length - all address space */ 1207 0, /* segment type */ 1208 0, /* segment descriptor priority level */ 1209 0, /* segment descriptor present */ 1210 0, 0, 1211 0, /* default 32 vs 16 bit size */ 1212 0 /* limit granularity (byte/page units)*/ }, 1213 /* Null Descriptor - overwritten by call gate */ 1214{ 0x0, /* segment base address */ 1215 0x0, /* length - all address space */ 1216 0, /* segment type */ 1217 0, /* segment descriptor priority level */ 1218 0, /* segment descriptor present */ 1219 0, 0, 1220 0, /* default 32 vs 16 bit size */ 1221 0 /* limit granularity (byte/page units)*/ }, 1222 /* Code Descriptor for user */ 1223{ 0x0, /* segment base address */ 1224 0xfffff, /* length - all address space */ 1225 SDT_MEMERA, /* segment type */ 1226 SEL_UPL, /* segment descriptor priority level */ 1227 1, /* segment descriptor present */ 1228 0, 0, 1229 1, /* default 32 vs 16 bit size */ 1230 1 /* limit granularity (byte/page units)*/ }, 1231 /* Data Descriptor for user */ 1232{ 0x0, /* segment base address */ 1233 0xfffff, /* length - all address space */ 1234 SDT_MEMRWA, /* segment type */ 1235 SEL_UPL, /* segment descriptor priority level */ 1236 1, /* segment descriptor present */ 1237 0, 0, 1238 1, /* default 32 vs 16 bit size */ 1239 1 /* limit granularity (byte/page units)*/ }, 1240}; 1241 1242void 1243setidt(idx, func, typ, dpl, selec) 1244 int idx; 1245 inthand_t *func; 1246 int typ; 1247 int dpl; 1248 int selec; 1249{ 1250 struct gate_descriptor *ip = idt + idx; 1251 1252 ip->gd_looffset = (int)func; 1253 ip->gd_selector = selec; 1254 ip->gd_stkcpy = 0; 1255 ip->gd_xx = 0; 1256 ip->gd_type = typ; 1257 ip->gd_dpl = dpl; 1258 ip->gd_p = 1; 1259 ip->gd_hioffset = ((int)func)>>16 ; 1260} 1261 1262#define IDTVEC(name) __CONCAT(X,name) 1263 1264extern inthand_t 1265 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 1266 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 1267 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 1268 IDTVEC(page), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 1269 IDTVEC(syscall); 1270 1271#if defined(COMPAT_LINUX) || defined(LINUX) 1272extern inthand_t 1273 IDTVEC(linux_syscall); 1274#endif 1275 1276void 1277sdtossd(sd, ssd) 1278 struct segment_descriptor *sd; 1279 struct soft_segment_descriptor *ssd; 1280{ 1281 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 1282 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 1283 ssd->ssd_type = sd->sd_type; 1284 ssd->ssd_dpl = sd->sd_dpl; 1285 ssd->ssd_p = sd->sd_p; 1286 ssd->ssd_def32 = sd->sd_def32; 1287 ssd->ssd_gran = sd->sd_gran; 1288} 1289 1290void 1291init386(first) 1292 int first; 1293{ 1294 int x; 1295 unsigned biosbasemem, biosextmem; 1296 struct gate_descriptor *gdp; 1297 int gsel_tss; 1298 /* table descriptors - used to load tables by microp */ 1299 struct region_descriptor r_gdt, r_idt; 1300 int pagesinbase, pagesinext; 1301 int target_page, pa_indx; 1302 1303 proc0.p_addr = proc0paddr; 1304 1305 /* 1306 * Initialize the console before we print anything out. 1307 */ 1308 cninit(); 1309 1310 /* 1311 * make gdt memory segments, the code segment goes up to end of the 1312 * page with etext in it, the data segment goes to the end of 1313 * the address space 1314 */ 1315 /* 1316 * XXX text protection is temporarily (?) disabled. The limit was 1317 * i386_btop(i386_round_page(etext)) - 1. 1318 */ 1319 gdt_segs[GCODE_SEL].ssd_limit = i386_btop(0) - 1; 1320 gdt_segs[GDATA_SEL].ssd_limit = i386_btop(0) - 1; 1321 for (x = 0; x < NGDT; x++) 1322 ssdtosd(&gdt_segs[x], &gdt[x].sd); 1323 1324 /* make ldt memory segments */ 1325 /* 1326 * The data segment limit must not cover the user area because we 1327 * don't want the user area to be writable in copyout() etc. (page 1328 * level protection is lost in kernel mode on 386's). Also, we 1329 * don't want the user area to be writable directly (page level 1330 * protection of the user area is not available on 486's with 1331 * CR0_WP set, because there is no user-read/kernel-write mode). 1332 * 1333 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it 1334 * should be spelled ...MAX_USER... 1335 */ 1336#define VM_END_USER_RW_ADDRESS VM_MAXUSER_ADDRESS 1337 /* 1338 * The code segment limit has to cover the user area until we move 1339 * the signal trampoline out of the user area. This is safe because 1340 * the code segment cannot be written to directly. 1341 */ 1342#define VM_END_USER_R_ADDRESS (VM_END_USER_RW_ADDRESS + UPAGES * NBPG) 1343 ldt_segs[LUCODE_SEL].ssd_limit = i386_btop(VM_END_USER_R_ADDRESS) - 1; 1344 ldt_segs[LUDATA_SEL].ssd_limit = i386_btop(VM_END_USER_RW_ADDRESS) - 1; 1345 /* Note. eventually want private ldts per process */ 1346 for (x = 0; x < NLDT; x++) 1347 ssdtosd(&ldt_segs[x], &ldt[x].sd); 1348 1349 /* exceptions */ 1350 for (x = 0; x < NIDT; x++) 1351 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1352 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1353 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1354 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1355 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1356 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1357 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1358 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1359 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1360 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL)); 1361 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1362 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1363 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1364 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1365 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1366 setidt(14, &IDTVEC(page), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1367 setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1368 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1369 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1370#if defined(COMPAT_LINUX) || defined(LINUX) 1371 setidt(0x80, &IDTVEC(linux_syscall), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1372#endif 1373 1374#include "isa.h" 1375#if NISA >0 1376 isa_defaultirq(); 1377#endif 1378 rand_initialize(); 1379 1380 r_gdt.rd_limit = sizeof(gdt) - 1; 1381 r_gdt.rd_base = (int) gdt; 1382 lgdt(&r_gdt); 1383 1384 r_idt.rd_limit = sizeof(idt) - 1; 1385 r_idt.rd_base = (int) idt; 1386 lidt(&r_idt); 1387 1388 _default_ldt = GSEL(GLDT_SEL, SEL_KPL); 1389 lldt(_default_ldt); 1390 currentldt = _default_ldt; 1391 1392#ifdef DDB 1393 kdb_init(); 1394 if (boothowto & RB_KDB) 1395 Debugger("Boot flags requested debugger"); 1396#endif 1397 1398 /* Use BIOS values stored in RTC CMOS RAM, since probing 1399 * breaks certain 386 AT relics. 1400 */ 1401 biosbasemem = rtcin(RTC_BASELO)+ (rtcin(RTC_BASEHI)<<8); 1402 biosextmem = rtcin(RTC_EXTLO)+ (rtcin(RTC_EXTHI)<<8); 1403 1404 /* 1405 * Print a warning if the official BIOS interface disagrees 1406 * with the hackish interface used above. Eventually only 1407 * the official interface should be used. 1408 */ 1409 if (bootinfo.bi_memsizes_valid) { 1410 if (bootinfo.bi_basemem != biosbasemem) 1411 printf("BIOS basemem (%ldK) != RTC basemem (%dK)\n", 1412 bootinfo.bi_basemem, biosbasemem); 1413 if (bootinfo.bi_extmem != biosextmem) 1414 printf("BIOS extmem (%ldK) != RTC extmem (%dK)\n", 1415 bootinfo.bi_extmem, biosextmem); 1416 } 1417 1418 /* 1419 * If BIOS tells us that it has more than 640k in the basemem, 1420 * don't believe it - set it to 640k. 1421 */ 1422 if (biosbasemem > 640) 1423 biosbasemem = 640; 1424 1425 /* 1426 * Some 386 machines might give us a bogus number for extended 1427 * mem. If this happens, stop now. 1428 */ 1429#ifndef LARGEMEM 1430 if (biosextmem > 65536) { 1431 panic("extended memory beyond limit of 64MB"); 1432 /* NOTREACHED */ 1433 } 1434#endif 1435 1436 pagesinbase = biosbasemem * 1024 / NBPG; 1437 pagesinext = biosextmem * 1024 / NBPG; 1438 1439 /* 1440 * Special hack for chipsets that still remap the 384k hole when 1441 * there's 16MB of memory - this really confuses people that 1442 * are trying to use bus mastering ISA controllers with the 1443 * "16MB limit"; they only have 16MB, but the remapping puts 1444 * them beyond the limit. 1445 */ 1446 /* 1447 * If extended memory is between 15-16MB (16-17MB phys address range), 1448 * chop it to 15MB. 1449 */ 1450 if ((pagesinext > 3840) && (pagesinext < 4096)) 1451 pagesinext = 3840; 1452 1453 /* 1454 * Maxmem isn't the "maximum memory", it's one larger than the 1455 * highest page of of the physical address space. It 1456 */ 1457 Maxmem = pagesinext + 0x100000/PAGE_SIZE; 1458 1459#ifdef MAXMEM 1460 Maxmem = MAXMEM/4; 1461#endif 1462 1463 /* call pmap initialization to make new kernel address space */ 1464 pmap_bootstrap (first, 0); 1465 1466 /* 1467 * Size up each available chunk of physical memory. 1468 */ 1469 1470 /* 1471 * We currently don't bother testing base memory. 1472 * XXX ...but we probably should. 1473 */ 1474 pa_indx = 0; 1475 badpages = 0; 1476 if (pagesinbase > 1) { 1477 phys_avail[pa_indx++] = PAGE_SIZE; /* skip first page of memory */ 1478 phys_avail[pa_indx] = ptoa(pagesinbase);/* memory up to the ISA hole */ 1479 physmem = pagesinbase - 1; 1480 } else { 1481 /* point at first chunk end */ 1482 pa_indx++; 1483 } 1484 1485 for (target_page = avail_start; target_page < ptoa(Maxmem); target_page += PAGE_SIZE) { 1486 int tmp, page_bad = FALSE; 1487 1488 /* 1489 * map page into kernel: valid, read/write, non-cacheable 1490 */ 1491 *(int *)CMAP1 = PG_V | PG_KW | PG_N | target_page; 1492 pmap_update(); 1493 1494 tmp = *(int *)CADDR1; 1495 /* 1496 * Test for alternating 1's and 0's 1497 */ 1498 *(volatile int *)CADDR1 = 0xaaaaaaaa; 1499 if (*(volatile int *)CADDR1 != 0xaaaaaaaa) { 1500 page_bad = TRUE; 1501 } 1502 /* 1503 * Test for alternating 0's and 1's 1504 */ 1505 *(volatile int *)CADDR1 = 0x55555555; 1506 if (*(volatile int *)CADDR1 != 0x55555555) { 1507 page_bad = TRUE; 1508 } 1509 /* 1510 * Test for all 1's 1511 */ 1512 *(volatile int *)CADDR1 = 0xffffffff; 1513 if (*(volatile int *)CADDR1 != 0xffffffff) { 1514 page_bad = TRUE; 1515 } 1516 /* 1517 * Test for all 0's 1518 */ 1519 *(volatile int *)CADDR1 = 0x0; 1520 if (*(volatile int *)CADDR1 != 0x0) { 1521 /* 1522 * test of page failed 1523 */ 1524 page_bad = TRUE; 1525 } 1526 /* 1527 * Restore original value. 1528 */ 1529 *(int *)CADDR1 = tmp; 1530 1531 /* 1532 * Adjust array of valid/good pages. 1533 */ 1534 if (page_bad == FALSE) { 1535 /* 1536 * If this good page is a continuation of the 1537 * previous set of good pages, then just increase 1538 * the end pointer. Otherwise start a new chunk. 1539 * Note that "end" points one higher than end, 1540 * making the range >= start and < end. 1541 */ 1542 if (phys_avail[pa_indx] == target_page) { 1543 phys_avail[pa_indx] += PAGE_SIZE; 1544 } else { 1545 pa_indx++; 1546 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 1547 printf("Too many holes in the physical address space, giving up\n"); 1548 pa_indx--; 1549 break; 1550 } 1551 phys_avail[pa_indx++] = target_page; /* start */ 1552 phys_avail[pa_indx] = target_page + PAGE_SIZE; /* end */ 1553 } 1554 physmem++; 1555 } else { 1556 badpages++; 1557 page_bad = FALSE; 1558 } 1559 } 1560 1561 *(int *)CMAP1 = 0; 1562 pmap_update(); 1563 1564 /* 1565 * XXX 1566 * The last chunk must contain at least one page plus the message 1567 * buffer to avoid complicating other code (message buffer address 1568 * calculation, etc.). 1569 */ 1570 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 1571 round_page(sizeof(struct msgbuf)) >= phys_avail[pa_indx]) { 1572 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 1573 phys_avail[pa_indx--] = 0; 1574 phys_avail[pa_indx--] = 0; 1575 } 1576 1577 Maxmem = atop(phys_avail[pa_indx]); 1578 1579 /* Trim off space for the message buffer. */ 1580 phys_avail[pa_indx] -= round_page(sizeof(struct msgbuf)); 1581 1582 avail_end = phys_avail[pa_indx]; 1583 1584 /* now running on new page tables, configured,and u/iom is accessible */ 1585 1586 /* make a initial tss so microp can get interrupt stack on syscall! */ 1587 proc0.p_addr->u_pcb.pcb_tss.tss_esp0 = (int) kstack + UPAGES*NBPG; 1588 proc0.p_addr->u_pcb.pcb_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ; 1589 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 1590 1591 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 = 1592 dblfault_tss.tss_esp2 = (int) &dblfault_stack[sizeof(dblfault_stack)]; 1593 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 = 1594 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL); 1595 dblfault_tss.tss_cr3 = IdlePTD; 1596 dblfault_tss.tss_eip = (int) dblfault_handler; 1597 dblfault_tss.tss_eflags = PSL_KERNEL; 1598 dblfault_tss.tss_ds = dblfault_tss.tss_es = dblfault_tss.tss_fs = dblfault_tss.tss_gs = 1599 GSEL(GDATA_SEL, SEL_KPL); 1600 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL); 1601 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL); 1602 1603 ((struct i386tss *)gdt_segs[GPROC0_SEL].ssd_base)->tss_ioopt = 1604 (sizeof(struct i386tss))<<16; 1605 1606 ltr(gsel_tss); 1607 1608 /* make a call gate to reenter kernel with */ 1609 gdp = &ldt[LSYS5CALLS_SEL].gd; 1610 1611 x = (int) &IDTVEC(syscall); 1612 gdp->gd_looffset = x++; 1613 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL); 1614 gdp->gd_stkcpy = 1; 1615 gdp->gd_type = SDT_SYS386CGT; 1616 gdp->gd_dpl = SEL_UPL; 1617 gdp->gd_p = 1; 1618 gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16; 1619 1620 /* transfer to user mode */ 1621 1622 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL); 1623 _udatasel = LSEL(LUDATA_SEL, SEL_UPL); 1624 1625 /* setup proc 0's pcb */ 1626 bcopy(&sigcode, proc0.p_addr->u_pcb.pcb_sigc, szsigcode); 1627 proc0.p_addr->u_pcb.pcb_flags = 0; 1628 proc0.p_addr->u_pcb.pcb_ptd = IdlePTD; 1629} 1630 1631/* 1632 * The registers are in the frame; the frame is in the user area of 1633 * the process in question; when the process is active, the registers 1634 * are in "the kernel stack"; when it's not, they're still there, but 1635 * things get flipped around. So, since p->p_md.md_regs is the whole address 1636 * of the register set, take its offset from the kernel stack, and 1637 * index into the user block. Don't you just *love* virtual memory? 1638 * (I'm starting to think seymour is right...) 1639 */ 1640#define TF_REGP(p) ((struct trapframe *) \ 1641 ((char *)(p)->p_addr \ 1642 + ((char *)(p)->p_md.md_regs - kstack))) 1643 1644int 1645ptrace_set_pc(p, addr) 1646 struct proc *p; 1647 unsigned int addr; 1648{ 1649 TF_REGP(p)->tf_eip = addr; 1650 return (0); 1651} 1652 1653int 1654ptrace_single_step(p) 1655 struct proc *p; 1656{ 1657 TF_REGP(p)->tf_eflags |= PSL_T; 1658 return (0); 1659} 1660 1661int ptrace_write_u(p, off, data) 1662 struct proc *p; 1663 vm_offset_t off; 1664 int data; 1665{ 1666 struct trapframe frame_copy; 1667 vm_offset_t min; 1668 struct trapframe *tp; 1669 1670 /* 1671 * Privileged kernel state is scattered all over the user area. 1672 * Only allow write access to parts of regs and to fpregs. 1673 */ 1674 min = (char *)p->p_md.md_regs - kstack; 1675 if (off >= min && off <= min + sizeof(struct trapframe) - sizeof(int)) { 1676 tp = TF_REGP(p); 1677 frame_copy = *tp; 1678 *(int *)((char *)&frame_copy + (off - min)) = data; 1679 if (!EFLAGS_SECURE(frame_copy.tf_eflags, tp->tf_eflags) || 1680 !CS_SECURE(frame_copy.tf_cs)) 1681 return (EINVAL); 1682 *(int*)((char *)p->p_addr + off) = data; 1683 return (0); 1684 } 1685 min = offsetof(struct user, u_pcb) + offsetof(struct pcb, pcb_savefpu); 1686 if (off >= min && off <= min + sizeof(struct save87) - sizeof(int)) { 1687 *(int*)((char *)p->p_addr + off) = data; 1688 return (0); 1689 } 1690 return (EFAULT); 1691} 1692 1693int 1694fill_regs(p, regs) 1695 struct proc *p; 1696 struct reg *regs; 1697{ 1698 struct trapframe *tp; 1699 1700 tp = TF_REGP(p); 1701 regs->r_es = tp->tf_es; 1702 regs->r_ds = tp->tf_ds; 1703 regs->r_edi = tp->tf_edi; 1704 regs->r_esi = tp->tf_esi; 1705 regs->r_ebp = tp->tf_ebp; 1706 regs->r_ebx = tp->tf_ebx; 1707 regs->r_edx = tp->tf_edx; 1708 regs->r_ecx = tp->tf_ecx; 1709 regs->r_eax = tp->tf_eax; 1710 regs->r_eip = tp->tf_eip; 1711 regs->r_cs = tp->tf_cs; 1712 regs->r_eflags = tp->tf_eflags; 1713 regs->r_esp = tp->tf_esp; 1714 regs->r_ss = tp->tf_ss; 1715 return (0); 1716} 1717 1718int 1719set_regs(p, regs) 1720 struct proc *p; 1721 struct reg *regs; 1722{ 1723 struct trapframe *tp; 1724 1725 tp = TF_REGP(p); 1726 if (!EFLAGS_SECURE(regs->r_eflags, tp->tf_eflags) || 1727 !CS_SECURE(regs->r_cs)) 1728 return (EINVAL); 1729 tp->tf_es = regs->r_es; 1730 tp->tf_ds = regs->r_ds; 1731 tp->tf_edi = regs->r_edi; 1732 tp->tf_esi = regs->r_esi; 1733 tp->tf_ebp = regs->r_ebp; 1734 tp->tf_ebx = regs->r_ebx; 1735 tp->tf_edx = regs->r_edx; 1736 tp->tf_ecx = regs->r_ecx; 1737 tp->tf_eax = regs->r_eax; 1738 tp->tf_eip = regs->r_eip; 1739 tp->tf_cs = regs->r_cs; 1740 tp->tf_eflags = regs->r_eflags; 1741 tp->tf_esp = regs->r_esp; 1742 tp->tf_ss = regs->r_ss; 1743 return (0); 1744} 1745 1746#ifndef DDB 1747void 1748Debugger(const char *msg) 1749{ 1750 printf("Debugger(\"%s\") called.\n", msg); 1751} 1752#endif /* no DDB */ 1753 1754#include <sys/disklabel.h> 1755#define b_cylin b_resid 1756/* 1757 * Determine the size of the transfer, and make sure it is 1758 * within the boundaries of the partition. Adjust transfer 1759 * if needed, and signal errors or early completion. 1760 */ 1761int 1762bounds_check_with_label(struct buf *bp, struct disklabel *lp, int wlabel) 1763{ 1764 struct partition *p = lp->d_partitions + dkpart(bp->b_dev); 1765 int labelsect = lp->d_partitions[0].p_offset; 1766 int maxsz = p->p_size, 1767 sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT; 1768 1769 /* overwriting disk label ? */ 1770 /* XXX should also protect bootstrap in first 8K */ 1771 if (bp->b_blkno + p->p_offset <= LABELSECTOR + labelsect && 1772#if LABELSECTOR != 0 1773 bp->b_blkno + p->p_offset + sz > LABELSECTOR + labelsect && 1774#endif 1775 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 1776 bp->b_error = EROFS; 1777 goto bad; 1778 } 1779 1780#if defined(DOSBBSECTOR) && defined(notyet) 1781 /* overwriting master boot record? */ 1782 if (bp->b_blkno + p->p_offset <= DOSBBSECTOR && 1783 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 1784 bp->b_error = EROFS; 1785 goto bad; 1786 } 1787#endif 1788 1789 /* beyond partition? */ 1790 if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz) { 1791 /* if exactly at end of disk, return an EOF */ 1792 if (bp->b_blkno == maxsz) { 1793 bp->b_resid = bp->b_bcount; 1794 return(0); 1795 } 1796 /* or truncate if part of it fits */ 1797 sz = maxsz - bp->b_blkno; 1798 if (sz <= 0) { 1799 bp->b_error = EINVAL; 1800 goto bad; 1801 } 1802 bp->b_bcount = sz << DEV_BSHIFT; 1803 } 1804 1805 /* calculate cylinder for disksort to order transfers with */ 1806 bp->b_pblkno = bp->b_blkno + p->p_offset; 1807 bp->b_cylin = bp->b_pblkno / lp->d_secpercyl; 1808 return(1); 1809 1810bad: 1811 bp->b_flags |= B_ERROR; 1812 return(-1); 1813} 1814 1815int 1816disk_externalize(int drive, struct sysctl_req *req) 1817{ 1818 return SYSCTL_OUT(req, &drive, sizeof drive); 1819} 1820