machdep.c revision 11390
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 1.143 1995/09/15 08:31:14 davidg 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/user.h> 51#include <sys/buf.h> 52#include <sys/reboot.h> 53#include <sys/conf.h> 54#include <sys/file.h> 55#include <sys/callout.h> 56#include <sys/malloc.h> 57#include <sys/mbuf.h> 58#include <sys/mount.h> 59#include <sys/msgbuf.h> 60#include <sys/ioctl.h> 61#include <sys/sysent.h> 62#include <sys/tty.h> 63#include <sys/sysctl.h> 64#include <sys/devconf.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_kern.h> 80#include <vm/vm_page.h> 81#include <vm/vm_pager.h> 82 83#include <sys/exec.h> 84#include <sys/vnode.h> 85 86#include <ddb/ddb.h> 87 88#include <net/netisr.h> 89 90/* XXX correctly declaring all the netisr's is painful. */ 91#include <net/if.h> 92#include <net/route.h> 93 94#include <netinet/in.h> 95#include <netinet/in_systm.h> 96#include <netinet/ip.h> 97#include <netinet/if_ether.h> 98#include <netinet/ip_var.h> 99 100#include <netns/ns.h> 101#include <netns/ns_if.h> 102 103#include <netiso/iso.h> 104#include <netiso/iso_var.h> 105 106#include <netccitt/dll.h> 107#include <netccitt/x25.h> 108#include <netccitt/pk.h> 109#include <sys/socketvar.h> 110#include <netccitt/pk_var.h> 111 112#include "ether.h" 113 114#include <machine/cpu.h> 115#include <machine/npx.h> 116#include <machine/reg.h> 117#include <machine/psl.h> 118#include <machine/clock.h> 119#include <machine/specialreg.h> 120#include <machine/sysarch.h> 121#include <machine/cons.h> 122#include <machine/devconf.h> 123#include <machine/bootinfo.h> 124#include <machine/md_var.h> 125 126#include <i386/isa/isa.h> 127#include <i386/isa/isa_device.h> 128#include <i386/isa/rtc.h> 129 130extern void diediedie __P((void)); 131extern void init386 __P((int first)); 132extern int ptrace_set_pc __P((struct proc *p, unsigned int addr)); 133extern int ptrace_single_step __P((struct proc *p)); 134extern int ptrace_getregs __P((struct proc *p, unsigned int *addr)); 135extern int ptrace_setregs __P((struct proc *p, unsigned int *addr)); 136extern int ptrace_write_u __P((struct proc *p, vm_offset_t off, int data)); 137 138static void cpu_startup __P((void *)); 139SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL) 140 141static void identifycpu(void); 142 143char machine[] = "i386"; 144char cpu_model[128]; 145 146struct kern_devconf kdc_cpu0 = { 147 0, 0, 0, /* filled in by dev_attach */ 148 "cpu", 0, { MDDT_CPU }, 149 0, 0, 0, CPU_EXTERNALLEN, 150 0, /* CPU has no parent */ 151 0, /* no parentdata */ 152 DC_BUSY, /* the CPU is always busy */ 153 cpu_model, /* no sense in duplication */ 154 DC_CLS_CPU /* class */ 155}; 156 157#ifndef PANIC_REBOOT_WAIT_TIME 158#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */ 159#endif 160 161#ifdef BOUNCE_BUFFERS 162extern char *bouncememory; 163extern int maxbkva; 164#ifdef BOUNCEPAGES 165int bouncepages = BOUNCEPAGES; 166#else 167int bouncepages = 0; 168#endif 169#endif /* BOUNCE_BUFFERS */ 170 171extern int freebufspace; 172int msgbufmapped = 0; /* set when safe to use msgbuf */ 173int _udatasel, _ucodesel; 174 175 176/* 177 * Machine-dependent startup code 178 */ 179int boothowto = 0, bootverbose = 0, Maxmem = 0, badpages = 0, physmem = 0; 180long dumplo; 181extern int bootdev; 182int biosmem; 183 184vm_offset_t phys_avail[10]; 185 186/* must be 2 less so 0 0 can signal end of chunks */ 187#define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(vm_offset_t)) - 2) 188 189int cpu_class; 190 191void dumpsys __P((void)); 192void setup_netisrs __P((struct linker_set *)); /* XXX declare elsewhere */ 193 194vm_offset_t buffer_sva, buffer_eva; 195vm_offset_t clean_sva, clean_eva; 196vm_offset_t pager_sva, pager_eva; 197extern struct linker_set netisr_set; 198 199#define offsetof(type, member) ((size_t)(&((type *)0)->member)) 200 201static void 202cpu_startup(dummy) 203 void *dummy; 204{ 205 register unsigned i; 206 register caddr_t v; 207 vm_offset_t maxaddr; 208 vm_size_t size = 0; 209 int firstaddr, indx; 210 vm_offset_t minaddr; 211 212 if (boothowto & RB_VERBOSE) 213 bootverbose++; 214 215 /* 216 * Initialize error message buffer (at end of core). 217 */ 218 219 /* avail_end was pre-decremented in init_386() to compensate */ 220 for (i = 0; i < btoc(sizeof (struct msgbuf)); i++) 221 pmap_enter(pmap_kernel(), (vm_offset_t)msgbufp, 222 avail_end + i * NBPG, 223 VM_PROT_ALL, TRUE); 224 msgbufmapped = 1; 225 226 /* 227 * Good {morning,afternoon,evening,night}. 228 */ 229 printf(version); 230 startrtclock(); 231 identifycpu(); 232 printf("real memory = %d (%dK bytes)\n", ptoa(Maxmem), ptoa(Maxmem) / 1024); 233 /* 234 * Display any holes after the first chunk of extended memory. 235 */ 236 if (badpages != 0) { 237 int indx = 1; 238 239 /* 240 * XXX skip reporting ISA hole & unmanaged kernel memory 241 */ 242 if (phys_avail[0] == PAGE_SIZE) 243 indx += 2; 244 245 printf("Physical memory hole(s):\n"); 246 for (; phys_avail[indx + 1] != 0; indx += 2) { 247 int size = phys_avail[indx + 1] - phys_avail[indx]; 248 249 printf("0x%08x - 0x%08x, %d bytes (%d pages)\n", phys_avail[indx], 250 phys_avail[indx + 1] - 1, size, size / PAGE_SIZE); 251 } 252 } 253 254 /* 255 * Quickly wire in netisrs. 256 */ 257 setup_netisrs(&netisr_set); 258 259/* 260#ifdef ISDN 261 DONET(isdnintr, NETISR_ISDN); 262#endif 263*/ 264 265 /* 266 * Allocate space for system data structures. 267 * The first available kernel virtual address is in "v". 268 * As pages of kernel virtual memory are allocated, "v" is incremented. 269 * As pages of memory are allocated and cleared, 270 * "firstaddr" is incremented. 271 * An index into the kernel page table corresponding to the 272 * virtual memory address maintained in "v" is kept in "mapaddr". 273 */ 274 275 /* 276 * Make two passes. The first pass calculates how much memory is 277 * needed and allocates it. The second pass assigns virtual 278 * addresses to the various data structures. 279 */ 280 firstaddr = 0; 281again: 282 v = (caddr_t)firstaddr; 283 284#define valloc(name, type, num) \ 285 (name) = (type *)v; v = (caddr_t)((name)+(num)) 286#define valloclim(name, type, num, lim) \ 287 (name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num))) 288 valloc(callout, struct callout, ncallout); 289#ifdef SYSVSHM 290 valloc(shmsegs, struct shmid_ds, shminfo.shmmni); 291#endif 292#ifdef SYSVSEM 293 valloc(sema, struct semid_ds, seminfo.semmni); 294 valloc(sem, struct sem, seminfo.semmns); 295 /* This is pretty disgusting! */ 296 valloc(semu, int, (seminfo.semmnu * seminfo.semusz) / sizeof(int)); 297#endif 298#ifdef SYSVMSG 299 valloc(msgpool, char, msginfo.msgmax); 300 valloc(msgmaps, struct msgmap, msginfo.msgseg); 301 valloc(msghdrs, struct msg, msginfo.msgtql); 302 valloc(msqids, struct msqid_ds, msginfo.msgmni); 303#endif 304 305 if (nbuf == 0) { 306 nbuf = 30; 307 if( physmem > 1024) 308 nbuf += min((physmem - 1024) / 12, 1024); 309 } 310 nswbuf = min(nbuf, 128); 311 312 valloc(swbuf, struct buf, nswbuf); 313 valloc(buf, struct buf, nbuf); 314 315#ifdef BOUNCE_BUFFERS 316 /* 317 * If there is more than 16MB of memory, allocate some bounce buffers 318 */ 319 if (Maxmem > 4096) { 320 if (bouncepages == 0) { 321 bouncepages = 64; 322 bouncepages += ((Maxmem - 4096) / 2048) * 32; 323 } 324 v = (caddr_t)((vm_offset_t)((vm_offset_t)v + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1)); 325 valloc(bouncememory, char, bouncepages * PAGE_SIZE); 326 } 327#endif 328 329 /* 330 * End of first pass, size has been calculated so allocate memory 331 */ 332 if (firstaddr == 0) { 333 size = (vm_size_t)(v - firstaddr); 334 firstaddr = (int)kmem_alloc(kernel_map, round_page(size)); 335 if (firstaddr == 0) 336 panic("startup: no room for tables"); 337 goto again; 338 } 339 340 /* 341 * End of second pass, addresses have been assigned 342 */ 343 if ((vm_size_t)(v - firstaddr) != size) 344 panic("startup: table size inconsistency"); 345 346#ifdef BOUNCE_BUFFERS 347 clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva, 348 (nbuf*MAXBSIZE) + (nswbuf*MAXPHYS) + 349 maxbkva + pager_map_size, TRUE); 350 io_map = kmem_suballoc(clean_map, &minaddr, &maxaddr, maxbkva, FALSE); 351#else 352 clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva, 353 (nbuf*MAXBSIZE) + (nswbuf*MAXPHYS) + pager_map_size, TRUE); 354#endif 355 buffer_map = kmem_suballoc(clean_map, &buffer_sva, &buffer_eva, 356 (nbuf*MAXBSIZE), TRUE); 357 pager_map = kmem_suballoc(clean_map, &pager_sva, &pager_eva, 358 (nswbuf*MAXPHYS) + pager_map_size, TRUE); 359 exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, 360 (16*ARG_MAX), TRUE); 361 u_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, 362 (maxproc*UPAGES*PAGE_SIZE), FALSE); 363 364 /* 365 * Finally, allocate mbuf pool. Since mclrefcnt is an off-size 366 * we use the more space efficient malloc in place of kmem_alloc. 367 */ 368 mclrefcnt = (char *)malloc(nmbclusters+CLBYTES/MCLBYTES, 369 M_MBUF, M_NOWAIT); 370 bzero(mclrefcnt, nmbclusters+CLBYTES/MCLBYTES); 371 mb_map = kmem_suballoc(kmem_map, (vm_offset_t *)&mbutl, &maxaddr, 372 nmbclusters * MCLBYTES, FALSE); 373 /* 374 * Initialize callouts 375 */ 376 callfree = callout; 377 for (i = 1; i < ncallout; i++) 378 callout[i-1].c_next = &callout[i]; 379 380 if (boothowto & RB_CONFIG) { 381 userconfig(); 382 cninit(); /* the preferred console may have changed */ 383 } 384 385#ifdef BOUNCE_BUFFERS 386 /* 387 * init bounce buffers 388 */ 389 vm_bounce_init(); 390#endif 391 /* 392 * XXX allocate a contiguous area for ISA (non busmaster) DMA 393 * operations. This _should_ only be done if the DMA channels 394 * will actually be used, but for now we do it always. 395 */ 396#define DMAPAGES 8 397 isaphysmem = 398 vm_page_alloc_contig(DMAPAGES * PAGE_SIZE, 0, 0xfffffful, 64*1024); 399 400 printf("avail memory = %d (%dK bytes)\n", ptoa(cnt.v_free_count), 401 ptoa(cnt.v_free_count) / 1024); 402 403 /* 404 * Set up buffers, so they can be used to read disk labels. 405 */ 406 bufinit(); 407 vm_pager_bufferinit(); 408 409 /* 410 * In verbose mode, print out the BIOS's idea of the disk geometries. 411 */ 412 if (bootverbose) { 413 printf("BIOS Geometries:\n"); 414 for (i = 0; i < N_BIOS_GEOM; i++) { 415 unsigned long bios_geom; 416 int max_cylinder, max_head, max_sector; 417 418 bios_geom = bootinfo.bi_bios_geom[i]; 419 420 /* 421 * XXX the bootstrap punts a 1200K floppy geometry 422 * when the get-disk-geometry interrupt fails. Skip 423 * drives that have this geometry. 424 */ 425 if (bios_geom == 0x4f010f) 426 continue; 427 428 printf(" %x:%08x ", i, bios_geom); 429 max_cylinder = bios_geom >> 16; 430 max_head = (bios_geom >> 8) & 0xff; 431 max_sector = bios_geom & 0xff; 432 printf( 433 "0..%d=%d cylinders, 0..%d=%d heads, 1..%d=%d sectors\n", 434 max_cylinder, max_cylinder + 1, 435 max_head, max_head + 1, 436 max_sector, max_sector); 437 } 438 printf(" %d accounted for\n", bootinfo.bi_n_bios_used); 439 } 440} 441 442void 443setup_netisrs(struct linker_set *ls) 444{ 445 int i; 446 const struct netisrtab *nit; 447 448 for(i = 0; ls->ls_items[i]; i++) { 449 nit = (const struct netisrtab *)ls->ls_items[i]; 450 netisrs[nit->nit_num] = nit->nit_isr; 451 } 452} 453 454struct cpu_nameclass i386_cpus[] = { 455 { "Intel 80286", CPUCLASS_286 }, /* CPU_286 */ 456 { "i386SX", CPUCLASS_386 }, /* CPU_386SX */ 457 { "i386DX", CPUCLASS_386 }, /* CPU_386 */ 458 { "i486SX", CPUCLASS_486 }, /* CPU_486SX */ 459 { "i486DX", CPUCLASS_486 }, /* CPU_486 */ 460 { "Pentium", CPUCLASS_586 }, /* CPU_586 */ 461 { "Cy486DLC", CPUCLASS_486 }, /* CPU_486DLC */ 462}; 463 464static void 465identifycpu() 466{ 467 printf("CPU: "); 468 if (cpu >= 0 469 && cpu < (sizeof i386_cpus/sizeof(struct cpu_nameclass))) { 470 cpu_class = i386_cpus[cpu].cpu_class; 471 strncpy(cpu_model, i386_cpus[cpu].cpu_name, sizeof cpu_model); 472 } else { 473 printf("unknown cpu type %d\n", cpu); 474 panic("startup: bad cpu id"); 475 } 476 477#if defined(I586_CPU) 478 if(cpu_class == CPUCLASS_586) { 479 calibrate_cyclecounter(); 480 printf("%d-MHz ", pentium_mhz); 481 } 482#endif 483#if defined(I486_CPU) || defined(I586_CPU) 484 if (!strcmp(cpu_vendor,"GenuineIntel")) { 485 if ((cpu_id & 0xf00) > 3) { 486 cpu_model[0] = '\0'; 487 488 switch (cpu_id & 0x3000) { 489 case 0x1000: 490 strcpy(cpu_model, "Overdrive "); 491 break; 492 case 0x2000: 493 strcpy(cpu_model, "Dual "); 494 break; 495 } 496 if ((cpu_id & 0xf00) == 0x400) { 497 strcat(cpu_model, "i486 "); 498#if defined(I586_CPU) 499 } else if ((cpu_id & 0xf00) == 0x500) { 500 strcat(cpu_model, "Pentium "); 501#endif 502 } else { 503 strcat(cpu_model, "unknown "); 504 } 505 506 switch (cpu_id & 0xff0) { 507 case 0x400: 508 strcat(cpu_model, "DX"); break; 509 case 0x410: 510 strcat(cpu_model, "DX"); break; 511 case 0x420: 512 strcat(cpu_model, "SX"); break; 513 case 0x430: 514 strcat(cpu_model, "DX2"); break; 515 case 0x440: 516 strcat(cpu_model, "SL"); break; 517 case 0x450: 518 strcat(cpu_model, "SX2"); break; 519 case 0x470: 520 strcat(cpu_model, "DX2 Write-Back Enhanced"); 521 break; 522 case 0x480: 523 strcat(cpu_model, "DX4"); break; 524#if defined(I586_CPU) 525 case 0x510: 526 if (pentium_mhz == 60) { 527 strcat(cpu_model, "510\\60"); 528 } else if (pentium_mhz == 66) { 529 strcat(cpu_model, "567\\66"); 530 } else { 531 strcat(cpu_model,"510\\60 or 567\\66"); 532 } 533 break; 534 case 0x520: 535 if (pentium_mhz == 90) { 536 strcat(cpu_model, "735\\90"); 537 } else if (pentium_mhz == 100) { 538 strcat(cpu_model, "815\\100"); 539 } else { 540 strcat(cpu_model,"735\\90 or 815\\100"); 541 } 542 break; 543#endif 544 } 545 } 546 } 547#endif 548 printf("%s (", cpu_model); 549 switch(cpu_class) { 550 case CPUCLASS_286: 551 printf("286"); 552 break; 553#if defined(I386_CPU) 554 case CPUCLASS_386: 555 printf("386"); 556 break; 557#endif 558#if defined(I486_CPU) 559 case CPUCLASS_486: 560 printf("486"); 561 break; 562#endif 563#if defined(I586_CPU) 564 case CPUCLASS_586: 565 printf("Pentium"); 566 break; 567#endif 568 default: 569 printf("unknown"); /* will panic below... */ 570 } 571 printf("-class CPU)\n"); 572#if defined(I486_CPU) || defined(I586_CPU) 573 if(*cpu_vendor) 574 printf(" Origin = \"%s\"",cpu_vendor); 575 if(cpu_id) 576 printf(" Id = 0x%lx",cpu_id); 577 578 if (!strcmp(cpu_vendor, "GenuineIntel")) { 579 printf(" Stepping=%ld", cpu_id & 0xf); 580 if (cpu_high > 0) { 581#define FEATUREFMT "\020\001FPU\002VME\003PSE\004MCE\005CX8\006APIC" 582 printf("\n Features=0x%b", cpu_feature, FEATUREFMT); 583 } 584 } 585 /* Avoid ugly blank lines: only print newline when we have to. */ 586 if (*cpu_vendor || cpu_id) 587 printf("\n"); 588#endif 589 /* 590 * Now that we have told the user what they have, 591 * let them know if that machine type isn't configured. 592 */ 593 switch (cpu_class) { 594 case CPUCLASS_286: /* a 286 should not make it this far, anyway */ 595#if !defined(I386_CPU) && !defined(I486_CPU) && !defined(I586_CPU) 596#error This kernel is not configured for one of the supported CPUs 597#endif 598#if !defined(I386_CPU) 599 case CPUCLASS_386: 600#endif 601#if !defined(I486_CPU) 602 case CPUCLASS_486: 603#endif 604#if !defined(I586_CPU) 605 case CPUCLASS_586: 606#endif 607 panic("CPU class not configured"); 608 default: 609 break; 610 } 611 dev_attach(&kdc_cpu0); 612} 613 614/* 615 * Send an interrupt to process. 616 * 617 * Stack is set up to allow sigcode stored 618 * in u. to call routine, followed by kcall 619 * to sigreturn routine below. After sigreturn 620 * resets the signal mask, the stack, and the 621 * frame pointer, it returns to the user 622 * specified pc, psl. 623 */ 624void 625sendsig(catcher, sig, mask, code) 626 sig_t catcher; 627 int sig, mask; 628 unsigned code; 629{ 630 register struct proc *p = curproc; 631 register int *regs; 632 register struct sigframe *fp; 633 struct sigframe sf; 634 struct sigacts *psp = p->p_sigacts; 635 int oonstack; 636 637 regs = p->p_md.md_regs; 638 oonstack = psp->ps_sigstk.ss_flags & SA_ONSTACK; 639 /* 640 * Allocate and validate space for the signal handler 641 * context. Note that if the stack is in P0 space, the 642 * call to grow() is a nop, and the useracc() check 643 * will fail if the process has not already allocated 644 * the space with a `brk'. 645 */ 646 if ((psp->ps_flags & SAS_ALTSTACK) && 647 (psp->ps_sigstk.ss_flags & SA_ONSTACK) == 0 && 648 (psp->ps_sigonstack & sigmask(sig))) { 649 fp = (struct sigframe *)(psp->ps_sigstk.ss_sp + 650 psp->ps_sigstk.ss_size - sizeof(struct sigframe)); 651 psp->ps_sigstk.ss_flags |= SA_ONSTACK; 652 } else { 653 fp = (struct sigframe *)(regs[tESP] 654 - sizeof(struct sigframe)); 655 } 656 657 /* 658 * grow() will return FALSE if the fp will not fit inside the stack 659 * and the stack can not be grown. useracc will return FALSE 660 * if access is denied. 661 */ 662 if ((grow(p, (int)fp) == FALSE) || 663 (useracc((caddr_t)fp, sizeof (struct sigframe), B_WRITE) == FALSE)) { 664 /* 665 * Process has trashed its stack; give it an illegal 666 * instruction to halt it in its tracks. 667 */ 668 SIGACTION(p, SIGILL) = SIG_DFL; 669 sig = sigmask(SIGILL); 670 p->p_sigignore &= ~sig; 671 p->p_sigcatch &= ~sig; 672 p->p_sigmask &= ~sig; 673 psignal(p, SIGILL); 674 return; 675 } 676 677 /* 678 * Build the argument list for the signal handler. 679 */ 680 if (p->p_sysent->sv_sigtbl) { 681 if (sig < p->p_sysent->sv_sigsize) 682 sig = p->p_sysent->sv_sigtbl[sig]; 683 else 684 sig = p->p_sysent->sv_sigsize + 1; 685 } 686 sf.sf_signum = sig; 687 sf.sf_code = code; 688 sf.sf_scp = &fp->sf_sc; 689 sf.sf_addr = (char *) regs[tERR]; 690 sf.sf_handler = catcher; 691 692 /* save scratch registers */ 693 sf.sf_sc.sc_eax = regs[tEAX]; 694 sf.sf_sc.sc_ebx = regs[tEBX]; 695 sf.sf_sc.sc_ecx = regs[tECX]; 696 sf.sf_sc.sc_edx = regs[tEDX]; 697 sf.sf_sc.sc_esi = regs[tESI]; 698 sf.sf_sc.sc_edi = regs[tEDI]; 699 sf.sf_sc.sc_cs = regs[tCS]; 700 sf.sf_sc.sc_ds = regs[tDS]; 701 sf.sf_sc.sc_ss = regs[tSS]; 702 sf.sf_sc.sc_es = regs[tES]; 703 sf.sf_sc.sc_isp = regs[tISP]; 704 705 /* 706 * Build the signal context to be used by sigreturn. 707 */ 708 sf.sf_sc.sc_onstack = oonstack; 709 sf.sf_sc.sc_mask = mask; 710 sf.sf_sc.sc_sp = regs[tESP]; 711 sf.sf_sc.sc_fp = regs[tEBP]; 712 sf.sf_sc.sc_pc = regs[tEIP]; 713 sf.sf_sc.sc_ps = regs[tEFLAGS]; 714 715 /* 716 * Copy the sigframe out to the user's stack. 717 */ 718 if (copyout(&sf, fp, sizeof(struct sigframe)) != 0) { 719 /* 720 * Something is wrong with the stack pointer. 721 * ...Kill the process. 722 */ 723 sigexit(p, SIGILL); 724 }; 725 726 regs[tESP] = (int)fp; 727 regs[tEIP] = (int)((struct pcb *)kstack)->pcb_sigc; 728 regs[tEFLAGS] &= ~PSL_VM; 729 regs[tCS] = _ucodesel; 730 regs[tDS] = _udatasel; 731 regs[tES] = _udatasel; 732 regs[tSS] = _udatasel; 733} 734 735/* 736 * System call to cleanup state after a signal 737 * has been taken. Reset signal mask and 738 * stack state from context left by sendsig (above). 739 * Return to previous pc and psl as specified by 740 * context left by sendsig. Check carefully to 741 * make sure that the user has not modified the 742 * state to gain improper privileges. 743 */ 744int 745sigreturn(p, uap, retval) 746 struct proc *p; 747 struct sigreturn_args /* { 748 struct sigcontext *sigcntxp; 749 } */ *uap; 750 int *retval; 751{ 752 register struct sigcontext *scp; 753 register struct sigframe *fp; 754 register int *regs = p->p_md.md_regs; 755 int eflags; 756 757 /* 758 * (XXX old comment) regs[tESP] points to the return address. 759 * The user scp pointer is above that. 760 * The return address is faked in the signal trampoline code 761 * for consistency. 762 */ 763 scp = uap->sigcntxp; 764 fp = (struct sigframe *) 765 ((caddr_t)scp - offsetof(struct sigframe, sf_sc)); 766 767 if (useracc((caddr_t)fp, sizeof (*fp), 0) == 0) 768 return(EINVAL); 769 770 /* 771 * Don't allow users to change privileged or reserved flags. 772 */ 773#define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 774 eflags = scp->sc_ps; 775 /* 776 * XXX do allow users to change the privileged flag PSL_RF. The 777 * cpu sets PSL_RF in tf_eflags for faults. Debuggers should 778 * sometimes set it there too. tf_eflags is kept in the signal 779 * context during signal handling and there is no other place 780 * to remember it, so the PSL_RF bit may be corrupted by the 781 * signal handler without us knowing. Corruption of the PSL_RF 782 * bit at worst causes one more or one less debugger trap, so 783 * allowing it is fairly harmless. 784 */ 785 if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs[tEFLAGS] & ~PSL_RF)) { 786#ifdef DEBUG 787 printf("sigreturn: eflags = 0x%x\n", eflags); 788#endif 789 return(EINVAL); 790 } 791 792 /* 793 * Don't allow users to load a valid privileged %cs. Let the 794 * hardware check for invalid selectors, excess privilege in 795 * other selectors, invalid %eip's and invalid %esp's. 796 */ 797#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 798 if (!CS_SECURE(scp->sc_cs)) { 799#ifdef DEBUG 800 printf("sigreturn: cs = 0x%x\n", scp->sc_cs); 801#endif 802 trapsignal(p, SIGBUS, T_PROTFLT); 803 return(EINVAL); 804 } 805 806 /* restore scratch registers */ 807 regs[tEAX] = scp->sc_eax; 808 regs[tEBX] = scp->sc_ebx; 809 regs[tECX] = scp->sc_ecx; 810 regs[tEDX] = scp->sc_edx; 811 regs[tESI] = scp->sc_esi; 812 regs[tEDI] = scp->sc_edi; 813 regs[tCS] = scp->sc_cs; 814 regs[tDS] = scp->sc_ds; 815 regs[tES] = scp->sc_es; 816 regs[tSS] = scp->sc_ss; 817 regs[tISP] = scp->sc_isp; 818 819 if (useracc((caddr_t)scp, sizeof (*scp), 0) == 0) 820 return(EINVAL); 821 822 if (scp->sc_onstack & 01) 823 p->p_sigacts->ps_sigstk.ss_flags |= SA_ONSTACK; 824 else 825 p->p_sigacts->ps_sigstk.ss_flags &= ~SA_ONSTACK; 826 p->p_sigmask = scp->sc_mask &~ 827 (sigmask(SIGKILL)|sigmask(SIGCONT)|sigmask(SIGSTOP)); 828 regs[tEBP] = scp->sc_fp; 829 regs[tESP] = scp->sc_sp; 830 regs[tEIP] = scp->sc_pc; 831 regs[tEFLAGS] = eflags; 832 return(EJUSTRETURN); 833} 834 835/* 836 * a simple function to make the system panic (and dump a vmcore) 837 * in a predictable fashion 838 */ 839void diediedie() 840{ 841 panic("because you said to!"); 842} 843 844int waittime = -1; 845struct pcb dumppcb; 846 847__dead void 848boot(howto) 849 int howto; 850{ 851 if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) { 852 register struct buf *bp; 853 int iter, nbusy; 854 855 waittime = 0; 856 printf("\nsyncing disks... "); 857 858 sync(&proc0, NULL, NULL); 859 860 for (iter = 0; iter < 20; iter++) { 861 nbusy = 0; 862 for (bp = &buf[nbuf]; --bp >= buf; ) { 863 if ((bp->b_flags & (B_BUSY | B_INVAL)) == B_BUSY) { 864 nbusy++; 865 } 866 } 867 if (nbusy == 0) 868 break; 869 printf("%d ", nbusy); 870 DELAY(40000 * iter); 871 } 872 if (nbusy) { 873 /* 874 * Failed to sync all blocks. Indicate this and don't 875 * unmount filesystems (thus forcing an fsck on reboot). 876 */ 877 printf("giving up\n"); 878 } else { 879 printf("done\n"); 880 /* 881 * Unmount filesystems 882 */ 883 if (panicstr == 0) 884 vfs_unmountall(); 885 } 886 DELAY(100000); /* wait for console output to finish */ 887 dev_shutdownall(FALSE); 888 } 889 splhigh(); 890 if (howto & RB_HALT) { 891 printf("\n"); 892 printf("The operating system has halted.\n"); 893 printf("Please press any key to reboot.\n\n"); 894 cngetc(); 895 } else { 896 if (howto & RB_DUMP) { 897 if (!cold) { 898 savectx(&dumppcb, 0); 899 dumppcb.pcb_ptd = rcr3(); 900 dumpsys(); 901 } 902 903 if (PANIC_REBOOT_WAIT_TIME != 0) { 904 if (PANIC_REBOOT_WAIT_TIME != -1) { 905 int loop; 906 printf("Automatic reboot in %d seconds - press a key on the console to abort\n", 907 PANIC_REBOOT_WAIT_TIME); 908 for (loop = PANIC_REBOOT_WAIT_TIME * 10; loop > 0; --loop) { 909 DELAY(1000 * 100); /* 1/10th second */ 910 if (cncheckc()) /* Did user type a key? */ 911 break; 912 } 913 if (!loop) 914 goto die; 915 } 916 } else { /* zero time specified - reboot NOW */ 917 goto die; 918 } 919 printf("--> Press a key on the console to reboot <--\n"); 920 cngetc(); 921 } 922 } 923die: 924 printf("Rebooting...\n"); 925 DELAY(1000000); /* wait 1 sec for printf's to complete and be read */ 926 cpu_reset(); 927 for(;;) ; 928 /* NOTREACHED */ 929} 930 931unsigned long dumpmag = 0x8fca0101UL; /* magic number for savecore */ 932int dumpsize = 0; /* also for savecore */ 933 934int dodump = 1; 935 936/* 937 * Doadump comes here after turning off memory management and 938 * getting on the dump stack, either when called above, or by 939 * the auto-restart code. 940 */ 941void 942dumpsys() 943{ 944 945 if (!dodump) 946 return; 947 if (dumpdev == NODEV) 948 return; 949 if ((minor(dumpdev)&07) != 1) 950 return; 951 dumpsize = Maxmem; 952 printf("\ndumping to dev %lx, offset %ld\n", dumpdev, dumplo); 953 printf("dump "); 954 switch ((*bdevsw[major(dumpdev)].d_dump)(dumpdev)) { 955 956 case ENXIO: 957 printf("device bad\n"); 958 break; 959 960 case EFAULT: 961 printf("device not ready\n"); 962 break; 963 964 case EINVAL: 965 printf("area improper\n"); 966 break; 967 968 case EIO: 969 printf("i/o error\n"); 970 break; 971 972 case EINTR: 973 printf("aborted from console\n"); 974 break; 975 976 default: 977 printf("succeeded\n"); 978 break; 979 } 980} 981 982/* 983 * Clear registers on exec 984 */ 985void 986setregs(p, entry, stack) 987 struct proc *p; 988 u_long entry; 989 u_long stack; 990{ 991 int *regs = p->p_md.md_regs; 992 993 bzero(regs, sizeof(struct trapframe)); 994 regs[tEIP] = entry; 995 regs[tESP] = stack; 996 regs[tEFLAGS] = PSL_USER | (regs[tEFLAGS] & PSL_T); 997 regs[tSS] = _udatasel; 998 regs[tDS] = _udatasel; 999 regs[tES] = _udatasel; 1000 regs[tCS] = _ucodesel; 1001 1002 p->p_addr->u_pcb.pcb_flags = 0; /* no fp at all */ 1003 load_cr0(rcr0() | CR0_TS); /* start emulating */ 1004#if NNPX > 0 1005 npxinit(__INITIAL_NPXCW__); 1006#endif /* NNPX > 0 */ 1007} 1008 1009/* 1010 * machine dependent system variables. 1011 */ 1012int 1013cpu_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p) 1014 int *name; 1015 u_int namelen; 1016 void *oldp; 1017 size_t *oldlenp; 1018 void *newp; 1019 size_t newlen; 1020 struct proc *p; 1021{ 1022 dev_t consdev; 1023 int error; 1024 1025 /* all sysctl names at this level are terminal */ 1026 if (namelen != 1) 1027 return (ENOTDIR); /* overloaded */ 1028 1029 switch (name[0]) { 1030 case CPU_CONSDEV: 1031 consdev = (cn_tty == NULL ? NODEV : cn_tty->t_dev); 1032 return (sysctl_rdstruct(oldp, oldlenp, newp, &consdev, 1033 sizeof consdev)); 1034 case CPU_ADJKERNTZ: 1035 error = sysctl_int(oldp, oldlenp, newp, newlen, &adjkerntz); 1036 if (!error && newp) 1037 resettodr(); 1038 return error; 1039 case CPU_DISRTCSET: 1040 return (sysctl_int(oldp, oldlenp, newp, newlen, &disable_rtc_set)); 1041 case CPU_BOOTINFO: 1042 return (sysctl_rdstruct(oldp, oldlenp, newp, &bootinfo, 1043 sizeof bootinfo)); 1044 default: 1045 return (EOPNOTSUPP); 1046 } 1047 /* NOTREACHED */ 1048} 1049 1050/* 1051 * Initialize 386 and configure to run kernel 1052 */ 1053 1054/* 1055 * Initialize segments & interrupt table 1056 */ 1057 1058int currentldt; 1059int _default_ldt; 1060union descriptor gdt[NGDT]; /* global descriptor table */ 1061struct gate_descriptor idt[NIDT]; /* interrupt descriptor table */ 1062union descriptor ldt[NLDT]; /* local descriptor table */ 1063 1064struct i386tss tss, panic_tss; 1065 1066extern struct user *proc0paddr; 1067 1068/* software prototypes -- in more palatable form */ 1069struct soft_segment_descriptor gdt_segs[] = { 1070/* GNULL_SEL 0 Null Descriptor */ 1071{ 0x0, /* segment base address */ 1072 0x0, /* length */ 1073 0, /* segment type */ 1074 0, /* segment descriptor priority level */ 1075 0, /* segment descriptor present */ 1076 0, 0, 1077 0, /* default 32 vs 16 bit size */ 1078 0 /* limit granularity (byte/page units)*/ }, 1079/* GCODE_SEL 1 Code Descriptor for kernel */ 1080{ 0x0, /* segment base address */ 1081 0xfffff, /* length - all address space */ 1082 SDT_MEMERA, /* segment type */ 1083 0, /* segment descriptor priority level */ 1084 1, /* segment descriptor present */ 1085 0, 0, 1086 1, /* default 32 vs 16 bit size */ 1087 1 /* limit granularity (byte/page units)*/ }, 1088/* GDATA_SEL 2 Data Descriptor for kernel */ 1089{ 0x0, /* segment base address */ 1090 0xfffff, /* length - all address space */ 1091 SDT_MEMRWA, /* segment type */ 1092 0, /* segment descriptor priority level */ 1093 1, /* segment descriptor present */ 1094 0, 0, 1095 1, /* default 32 vs 16 bit size */ 1096 1 /* limit granularity (byte/page units)*/ }, 1097/* GLDT_SEL 3 LDT Descriptor */ 1098{ (int) ldt, /* segment base address */ 1099 sizeof(ldt)-1, /* length - all address space */ 1100 SDT_SYSLDT, /* segment type */ 1101 0, /* segment descriptor priority level */ 1102 1, /* segment descriptor present */ 1103 0, 0, 1104 0, /* unused - default 32 vs 16 bit size */ 1105 0 /* limit granularity (byte/page units)*/ }, 1106/* GTGATE_SEL 4 Null Descriptor - Placeholder */ 1107{ 0x0, /* segment base address */ 1108 0x0, /* length - all address space */ 1109 0, /* segment type */ 1110 0, /* segment descriptor priority level */ 1111 0, /* segment descriptor present */ 1112 0, 0, 1113 0, /* default 32 vs 16 bit size */ 1114 0 /* limit granularity (byte/page units)*/ }, 1115/* GPANIC_SEL 5 Panic Tss Descriptor */ 1116{ (int) &panic_tss, /* segment base address */ 1117 sizeof(tss)-1, /* length - all address space */ 1118 SDT_SYS386TSS, /* segment type */ 1119 0, /* segment descriptor priority level */ 1120 1, /* segment descriptor present */ 1121 0, 0, 1122 0, /* unused - default 32 vs 16 bit size */ 1123 0 /* limit granularity (byte/page units)*/ }, 1124/* GPROC0_SEL 6 Proc 0 Tss Descriptor */ 1125{ (int) kstack, /* segment base address */ 1126 sizeof(tss)-1, /* length - all address space */ 1127 SDT_SYS386TSS, /* segment type */ 1128 0, /* segment descriptor priority level */ 1129 1, /* segment descriptor present */ 1130 0, 0, 1131 0, /* unused - default 32 vs 16 bit size */ 1132 0 /* limit granularity (byte/page units)*/ }, 1133/* GUSERLDT_SEL 7 User LDT Descriptor per process */ 1134{ (int) ldt, /* segment base address */ 1135 (512 * sizeof(union descriptor)-1), /* length */ 1136 SDT_SYSLDT, /* segment type */ 1137 0, /* segment descriptor priority level */ 1138 1, /* segment descriptor present */ 1139 0, 0, 1140 0, /* unused - default 32 vs 16 bit size */ 1141 0 /* limit granularity (byte/page units)*/ }, 1142/* GAPMCODE32_SEL 8 APM BIOS 32-bit interface (32bit Code) */ 1143{ 0, /* segment base address (overwritten by APM) */ 1144 0xfffff, /* length */ 1145 SDT_MEMERA, /* segment type */ 1146 0, /* segment descriptor priority level */ 1147 1, /* segment descriptor present */ 1148 0, 0, 1149 1, /* default 32 vs 16 bit size */ 1150 1 /* limit granularity (byte/page units)*/ }, 1151/* GAPMCODE16_SEL 9 APM BIOS 32-bit interface (16bit Code) */ 1152{ 0, /* segment base address (overwritten by APM) */ 1153 0xfffff, /* length */ 1154 SDT_MEMERA, /* segment type */ 1155 0, /* segment descriptor priority level */ 1156 1, /* segment descriptor present */ 1157 0, 0, 1158 0, /* default 32 vs 16 bit size */ 1159 1 /* limit granularity (byte/page units)*/ }, 1160/* GAPMDATA_SEL 10 APM BIOS 32-bit interface (Data) */ 1161{ 0, /* segment base address (overwritten by APM) */ 1162 0xfffff, /* length */ 1163 SDT_MEMRWA, /* segment type */ 1164 0, /* segment descriptor priority level */ 1165 1, /* segment descriptor present */ 1166 0, 0, 1167 1, /* default 32 vs 16 bit size */ 1168 1 /* limit granularity (byte/page units)*/ }, 1169}; 1170 1171struct soft_segment_descriptor ldt_segs[] = { 1172 /* Null Descriptor - overwritten by call gate */ 1173{ 0x0, /* segment base address */ 1174 0x0, /* length - all address space */ 1175 0, /* segment type */ 1176 0, /* segment descriptor priority level */ 1177 0, /* segment descriptor present */ 1178 0, 0, 1179 0, /* default 32 vs 16 bit size */ 1180 0 /* limit granularity (byte/page units)*/ }, 1181 /* Null Descriptor - overwritten by call gate */ 1182{ 0x0, /* segment base address */ 1183 0x0, /* length - all address space */ 1184 0, /* segment type */ 1185 0, /* segment descriptor priority level */ 1186 0, /* segment descriptor present */ 1187 0, 0, 1188 0, /* default 32 vs 16 bit size */ 1189 0 /* limit granularity (byte/page units)*/ }, 1190 /* Null Descriptor - overwritten by call gate */ 1191{ 0x0, /* segment base address */ 1192 0x0, /* length - all address space */ 1193 0, /* segment type */ 1194 0, /* segment descriptor priority level */ 1195 0, /* segment descriptor present */ 1196 0, 0, 1197 0, /* default 32 vs 16 bit size */ 1198 0 /* limit granularity (byte/page units)*/ }, 1199 /* Code Descriptor for user */ 1200{ 0x0, /* segment base address */ 1201 0xfffff, /* length - all address space */ 1202 SDT_MEMERA, /* segment type */ 1203 SEL_UPL, /* segment descriptor priority level */ 1204 1, /* segment descriptor present */ 1205 0, 0, 1206 1, /* default 32 vs 16 bit size */ 1207 1 /* limit granularity (byte/page units)*/ }, 1208 /* Data Descriptor for user */ 1209{ 0x0, /* segment base address */ 1210 0xfffff, /* length - all address space */ 1211 SDT_MEMRWA, /* segment type */ 1212 SEL_UPL, /* segment descriptor priority level */ 1213 1, /* segment descriptor present */ 1214 0, 0, 1215 1, /* default 32 vs 16 bit size */ 1216 1 /* limit granularity (byte/page units)*/ }, 1217}; 1218 1219void 1220setidt(idx, func, typ, dpl) 1221 int idx; 1222 inthand_t *func; 1223 int typ; 1224 int dpl; 1225{ 1226 struct gate_descriptor *ip = idt + idx; 1227 1228 ip->gd_looffset = (int)func; 1229 ip->gd_selector = 8; 1230 ip->gd_stkcpy = 0; 1231 ip->gd_xx = 0; 1232 ip->gd_type = typ; 1233 ip->gd_dpl = dpl; 1234 ip->gd_p = 1; 1235 ip->gd_hioffset = ((int)func)>>16 ; 1236} 1237 1238#define IDTVEC(name) __CONCAT(X,name) 1239 1240extern inthand_t 1241 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 1242 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(dble), IDTVEC(fpusegm), 1243 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 1244 IDTVEC(page), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 1245 IDTVEC(syscall); 1246 1247#ifdef COMPAT_LINUX 1248extern inthand_t 1249 IDTVEC(linux_syscall); 1250#endif 1251 1252void 1253sdtossd(sd, ssd) 1254 struct segment_descriptor *sd; 1255 struct soft_segment_descriptor *ssd; 1256{ 1257 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 1258 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 1259 ssd->ssd_type = sd->sd_type; 1260 ssd->ssd_dpl = sd->sd_dpl; 1261 ssd->ssd_p = sd->sd_p; 1262 ssd->ssd_def32 = sd->sd_def32; 1263 ssd->ssd_gran = sd->sd_gran; 1264} 1265 1266void 1267init386(first) 1268 int first; 1269{ 1270 int x; 1271 unsigned biosbasemem, biosextmem; 1272 struct gate_descriptor *gdp; 1273 int gsel_tss; 1274 /* table descriptors - used to load tables by microp */ 1275 struct region_descriptor r_gdt, r_idt; 1276 int pagesinbase, pagesinext; 1277 int target_page, pa_indx; 1278 1279 proc0.p_addr = proc0paddr; 1280 1281 /* 1282 * Initialize the console before we print anything out. 1283 */ 1284 cninit(); 1285 1286 /* 1287 * make gdt memory segments, the code segment goes up to end of the 1288 * page with etext in it, the data segment goes to the end of 1289 * the address space 1290 */ 1291 /* 1292 * XXX text protection is temporarily (?) disabled. The limit was 1293 * i386_btop(i386_round_page(etext)) - 1. 1294 */ 1295 gdt_segs[GCODE_SEL].ssd_limit = i386_btop(0) - 1; 1296 gdt_segs[GDATA_SEL].ssd_limit = i386_btop(0) - 1; 1297 for (x = 0; x < NGDT; x++) 1298 ssdtosd(&gdt_segs[x], &gdt[x].sd); 1299 1300 /* make ldt memory segments */ 1301 /* 1302 * The data segment limit must not cover the user area because we 1303 * don't want the user area to be writable in copyout() etc. (page 1304 * level protection is lost in kernel mode on 386's). Also, we 1305 * don't want the user area to be writable directly (page level 1306 * protection of the user area is not available on 486's with 1307 * CR0_WP set, because there is no user-read/kernel-write mode). 1308 * 1309 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it 1310 * should be spelled ...MAX_USER... 1311 */ 1312#define VM_END_USER_RW_ADDRESS VM_MAXUSER_ADDRESS 1313 /* 1314 * The code segment limit has to cover the user area until we move 1315 * the signal trampoline out of the user area. This is safe because 1316 * the code segment cannot be written to directly. 1317 */ 1318#define VM_END_USER_R_ADDRESS (VM_END_USER_RW_ADDRESS + UPAGES * NBPG) 1319 ldt_segs[LUCODE_SEL].ssd_limit = i386_btop(VM_END_USER_R_ADDRESS) - 1; 1320 ldt_segs[LUDATA_SEL].ssd_limit = i386_btop(VM_END_USER_RW_ADDRESS) - 1; 1321 /* Note. eventually want private ldts per process */ 1322 for (x = 0; x < NLDT; x++) 1323 ssdtosd(&ldt_segs[x], &ldt[x].sd); 1324 1325 /* exceptions */ 1326 for (x = 0; x < NIDT; x++) 1327 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL); 1328 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL); 1329 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL); 1330 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL); 1331 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL); 1332 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL); 1333 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL); 1334 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL); 1335 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL); 1336 setidt(8, &IDTVEC(dble), SDT_SYS386TGT, SEL_KPL); 1337 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL); 1338 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL); 1339 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL); 1340 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL); 1341 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL); 1342 setidt(14, &IDTVEC(page), SDT_SYS386TGT, SEL_KPL); 1343 setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL); 1344 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL); 1345 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL); 1346#ifdef COMPAT_LINUX 1347 setidt(0x80, &IDTVEC(linux_syscall), SDT_SYS386TGT, SEL_UPL); 1348#endif 1349 1350#include "isa.h" 1351#if NISA >0 1352 isa_defaultirq(); 1353#endif 1354 1355 r_gdt.rd_limit = sizeof(gdt) - 1; 1356 r_gdt.rd_base = (int) gdt; 1357 lgdt(&r_gdt); 1358 1359 r_idt.rd_limit = sizeof(idt) - 1; 1360 r_idt.rd_base = (int) idt; 1361 lidt(&r_idt); 1362 1363 _default_ldt = GSEL(GLDT_SEL, SEL_KPL); 1364 lldt(_default_ldt); 1365 currentldt = _default_ldt; 1366 1367#ifdef DDB 1368 kdb_init(); 1369 if (boothowto & RB_KDB) 1370 Debugger("Boot flags requested debugger"); 1371#endif 1372 1373 /* Use BIOS values stored in RTC CMOS RAM, since probing 1374 * breaks certain 386 AT relics. 1375 */ 1376 biosbasemem = rtcin(RTC_BASELO)+ (rtcin(RTC_BASEHI)<<8); 1377 biosextmem = rtcin(RTC_EXTLO)+ (rtcin(RTC_EXTHI)<<8); 1378 1379 /* 1380 * Print a warning if the official BIOS interface disagrees 1381 * with the hackish interface used above. Eventually only 1382 * the official interface should be used. 1383 */ 1384 if (bootinfo.bi_memsizes_valid) { 1385 if (bootinfo.bi_basemem != biosbasemem) 1386 printf("BIOS basemem (%ldK) != RTC basemem (%dK)\n", 1387 bootinfo.bi_basemem, biosbasemem); 1388 if (bootinfo.bi_extmem != biosextmem) 1389 printf("BIOS extmem (%ldK) != RTC extmem (%dK)\n", 1390 bootinfo.bi_extmem, biosextmem); 1391 } 1392 1393 /* 1394 * If BIOS tells us that it has more than 640k in the basemem, 1395 * don't believe it - set it to 640k. 1396 */ 1397 if (biosbasemem > 640) 1398 biosbasemem = 640; 1399 1400 /* 1401 * Some 386 machines might give us a bogus number for extended 1402 * mem. If this happens, stop now. 1403 */ 1404#ifndef LARGEMEM 1405 if (biosextmem > 65536) { 1406 panic("extended memory beyond limit of 64MB"); 1407 /* NOTREACHED */ 1408 } 1409#endif 1410 1411 pagesinbase = biosbasemem * 1024 / NBPG; 1412 pagesinext = biosextmem * 1024 / NBPG; 1413 1414 /* 1415 * Special hack for chipsets that still remap the 384k hole when 1416 * there's 16MB of memory - this really confuses people that 1417 * are trying to use bus mastering ISA controllers with the 1418 * "16MB limit"; they only have 16MB, but the remapping puts 1419 * them beyond the limit. 1420 */ 1421 /* 1422 * If extended memory is between 15-16MB (16-17MB phys address range), 1423 * chop it to 15MB. 1424 */ 1425 if ((pagesinext > 3840) && (pagesinext < 4096)) 1426 pagesinext = 3840; 1427 1428 /* 1429 * Maxmem isn't the "maximum memory", it's one larger than the 1430 * highest page of of the physical address space. It 1431 */ 1432 Maxmem = pagesinext + 0x100000/PAGE_SIZE; 1433 1434#ifdef MAXMEM 1435 Maxmem = MAXMEM/4; 1436#endif 1437 1438 /* call pmap initialization to make new kernel address space */ 1439 pmap_bootstrap (first, 0); 1440 1441 /* 1442 * Size up each available chunk of physical memory. 1443 */ 1444 1445 /* 1446 * We currently don't bother testing base memory. 1447 * XXX ...but we probably should. 1448 */ 1449 pa_indx = 0; 1450 badpages = 0; 1451 if (pagesinbase > 1) { 1452 phys_avail[pa_indx++] = PAGE_SIZE; /* skip first page of memory */ 1453 phys_avail[pa_indx] = ptoa(pagesinbase);/* memory up to the ISA hole */ 1454 physmem = pagesinbase - 1; 1455 } else { 1456 /* point at first chunk end */ 1457 pa_indx++; 1458 } 1459 1460 for (target_page = avail_start; target_page < ptoa(Maxmem); target_page += PAGE_SIZE) { 1461 int tmp, page_bad = FALSE; 1462 1463 /* 1464 * map page into kernel: valid, read/write, non-cacheable 1465 */ 1466 *(int *)CMAP1 = PG_V | PG_KW | PG_N | target_page; 1467 pmap_update(); 1468 1469 tmp = *(int *)CADDR1; 1470 /* 1471 * Test for alternating 1's and 0's 1472 */ 1473 *(int *)CADDR1 = 0xaaaaaaaa; 1474 if (*(int *)CADDR1 != 0xaaaaaaaa) { 1475 page_bad = TRUE; 1476 } 1477 /* 1478 * Test for alternating 0's and 1's 1479 */ 1480 *(int *)CADDR1 = 0x55555555; 1481 if (*(int *)CADDR1 != 0x55555555) { 1482 page_bad = TRUE; 1483 } 1484 /* 1485 * Test for all 1's 1486 */ 1487 *(int *)CADDR1 = 0xffffffff; 1488 if (*(int *)CADDR1 != 0xffffffff) { 1489 page_bad = TRUE; 1490 } 1491 /* 1492 * Test for all 0's 1493 */ 1494 *(int *)CADDR1 = 0x0; 1495 if (*(int *)CADDR1 != 0x0) { 1496 /* 1497 * test of page failed 1498 */ 1499 page_bad = TRUE; 1500 } 1501 /* 1502 * Restore original value. 1503 */ 1504 *(int *)CADDR1 = tmp; 1505 1506 /* 1507 * Adjust array of valid/good pages. 1508 */ 1509 if (page_bad == FALSE) { 1510 /* 1511 * If this good page is a continuation of the 1512 * previous set of good pages, then just increase 1513 * the end pointer. Otherwise start a new chunk. 1514 * Note that "end" points one higher than end, 1515 * making the range >= start and < end. 1516 */ 1517 if (phys_avail[pa_indx] == target_page) { 1518 phys_avail[pa_indx] += PAGE_SIZE; 1519 } else { 1520 pa_indx++; 1521 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 1522 printf("Too many holes in the physical address space, giving up\n"); 1523 pa_indx--; 1524 break; 1525 } 1526 phys_avail[pa_indx++] = target_page; /* start */ 1527 phys_avail[pa_indx] = target_page + PAGE_SIZE; /* end */ 1528 } 1529 physmem++; 1530 } else { 1531 badpages++; 1532 page_bad = FALSE; 1533 } 1534 } 1535 1536 *(int *)CMAP1 = 0; 1537 pmap_update(); 1538 1539 /* 1540 * XXX 1541 * The last chunk must contain at leat one page plus the message 1542 * buffer to avoid complicating other code (message buffer address 1543 * calculation, etc.). 1544 */ 1545 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 1546 round_page(sizeof(struct msgbuf)) >= phys_avail[pa_indx]) { 1547 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 1548 phys_avail[pa_indx--] = 0; 1549 phys_avail[pa_indx--] = 0; 1550 } 1551 1552 Maxmem = atop(phys_avail[pa_indx]); 1553 1554 /* Trim off space for the message buffer. */ 1555 phys_avail[pa_indx] -= round_page(sizeof(struct msgbuf)); 1556 1557 avail_end = phys_avail[pa_indx]; 1558 1559 /* now running on new page tables, configured,and u/iom is accessible */ 1560 1561 /* make a initial tss so microp can get interrupt stack on syscall! */ 1562 proc0.p_addr->u_pcb.pcb_tss.tss_esp0 = (int) kstack + UPAGES*NBPG; 1563 proc0.p_addr->u_pcb.pcb_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ; 1564 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 1565 1566 ((struct i386tss *)gdt_segs[GPROC0_SEL].ssd_base)->tss_ioopt = 1567 (sizeof(tss))<<16; 1568 1569 ltr(gsel_tss); 1570 1571 /* make a call gate to reenter kernel with */ 1572 gdp = &ldt[LSYS5CALLS_SEL].gd; 1573 1574 x = (int) &IDTVEC(syscall); 1575 gdp->gd_looffset = x++; 1576 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL); 1577 gdp->gd_stkcpy = 1; 1578 gdp->gd_type = SDT_SYS386CGT; 1579 gdp->gd_dpl = SEL_UPL; 1580 gdp->gd_p = 1; 1581 gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16; 1582 1583 /* transfer to user mode */ 1584 1585 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL); 1586 _udatasel = LSEL(LUDATA_SEL, SEL_UPL); 1587 1588 /* setup proc 0's pcb */ 1589 bcopy(&sigcode, proc0.p_addr->u_pcb.pcb_sigc, szsigcode); 1590 proc0.p_addr->u_pcb.pcb_flags = 0; 1591 proc0.p_addr->u_pcb.pcb_ptd = IdlePTD; 1592} 1593 1594/* 1595 * The registers are in the frame; the frame is in the user area of 1596 * the process in question; when the process is active, the registers 1597 * are in "the kernel stack"; when it's not, they're still there, but 1598 * things get flipped around. So, since p->p_md.md_regs is the whole address 1599 * of the register set, take its offset from the kernel stack, and 1600 * index into the user block. Don't you just *love* virtual memory? 1601 * (I'm starting to think seymour is right...) 1602 */ 1603#define TF_REGP(p) ((struct trapframe *) \ 1604 ((char *)(p)->p_addr \ 1605 + ((char *)(p)->p_md.md_regs - kstack))) 1606 1607int 1608ptrace_set_pc(p, addr) 1609 struct proc *p; 1610 unsigned int addr; 1611{ 1612 TF_REGP(p)->tf_eip = addr; 1613 return (0); 1614} 1615 1616int 1617ptrace_single_step(p) 1618 struct proc *p; 1619{ 1620 TF_REGP(p)->tf_eflags |= PSL_T; 1621 return (0); 1622} 1623 1624int 1625ptrace_getregs(p, addr) 1626 struct proc *p; 1627 unsigned int *addr; 1628{ 1629 int error; 1630 struct reg regs; 1631 1632 error = fill_regs(p, ®s); 1633 if (error) 1634 return (error); 1635 return (copyout(®s, addr, sizeof regs)); 1636} 1637 1638int 1639ptrace_setregs(p, addr) 1640 struct proc *p; 1641 unsigned int *addr; 1642{ 1643 int error; 1644 struct reg regs; 1645 1646 error = copyin(addr, ®s, sizeof regs); 1647 if (error) 1648 return (error); 1649 return (set_regs(p, ®s)); 1650} 1651 1652int ptrace_write_u(p, off, data) 1653 struct proc *p; 1654 vm_offset_t off; 1655 int data; 1656{ 1657 struct trapframe frame_copy; 1658 vm_offset_t min; 1659 struct trapframe *tp; 1660 1661 /* 1662 * Privileged kernel state is scattered all over the user area. 1663 * Only allow write access to parts of regs and to fpregs. 1664 */ 1665 min = (char *)p->p_md.md_regs - kstack; 1666 if (off >= min && off <= min + sizeof(struct trapframe) - sizeof(int)) { 1667 tp = TF_REGP(p); 1668 frame_copy = *tp; 1669 *(int *)((char *)&frame_copy + (off - min)) = data; 1670 if (!EFLAGS_SECURE(frame_copy.tf_eflags, tp->tf_eflags) || 1671 !CS_SECURE(frame_copy.tf_cs)) 1672 return (EINVAL); 1673 *(int*)((char *)p->p_addr + off) = data; 1674 return (0); 1675 } 1676 min = offsetof(struct user, u_pcb) + offsetof(struct pcb, pcb_savefpu); 1677 if (off >= min && off <= min + sizeof(struct save87) - sizeof(int)) { 1678 *(int*)((char *)p->p_addr + off) = data; 1679 return (0); 1680 } 1681 return (EFAULT); 1682} 1683 1684int 1685fill_regs(p, regs) 1686 struct proc *p; 1687 struct reg *regs; 1688{ 1689 struct trapframe *tp; 1690 1691 tp = TF_REGP(p); 1692 regs->r_es = tp->tf_es; 1693 regs->r_ds = tp->tf_ds; 1694 regs->r_edi = tp->tf_edi; 1695 regs->r_esi = tp->tf_esi; 1696 regs->r_ebp = tp->tf_ebp; 1697 regs->r_ebx = tp->tf_ebx; 1698 regs->r_edx = tp->tf_edx; 1699 regs->r_ecx = tp->tf_ecx; 1700 regs->r_eax = tp->tf_eax; 1701 regs->r_eip = tp->tf_eip; 1702 regs->r_cs = tp->tf_cs; 1703 regs->r_eflags = tp->tf_eflags; 1704 regs->r_esp = tp->tf_esp; 1705 regs->r_ss = tp->tf_ss; 1706 return (0); 1707} 1708 1709int 1710set_regs(p, regs) 1711 struct proc *p; 1712 struct reg *regs; 1713{ 1714 struct trapframe *tp; 1715 1716 tp = TF_REGP(p); 1717 if (!EFLAGS_SECURE(regs->r_eflags, tp->tf_eflags) || 1718 !CS_SECURE(regs->r_cs)) 1719 return (EINVAL); 1720 tp->tf_es = regs->r_es; 1721 tp->tf_ds = regs->r_ds; 1722 tp->tf_edi = regs->r_edi; 1723 tp->tf_esi = regs->r_esi; 1724 tp->tf_ebp = regs->r_ebp; 1725 tp->tf_ebx = regs->r_ebx; 1726 tp->tf_edx = regs->r_edx; 1727 tp->tf_ecx = regs->r_ecx; 1728 tp->tf_eax = regs->r_eax; 1729 tp->tf_eip = regs->r_eip; 1730 tp->tf_cs = regs->r_cs; 1731 tp->tf_eflags = regs->r_eflags; 1732 tp->tf_esp = regs->r_esp; 1733 tp->tf_ss = regs->r_ss; 1734 return (0); 1735} 1736 1737#ifndef DDB 1738void 1739Debugger(const char *msg) 1740{ 1741 printf("Debugger(\"%s\") called.\n", msg); 1742} 1743#endif /* no DDB */ 1744 1745#include <sys/disklabel.h> 1746#define b_cylin b_resid 1747/* 1748 * Determine the size of the transfer, and make sure it is 1749 * within the boundaries of the partition. Adjust transfer 1750 * if needed, and signal errors or early completion. 1751 */ 1752int 1753bounds_check_with_label(struct buf *bp, struct disklabel *lp, int wlabel) 1754{ 1755 struct partition *p = lp->d_partitions + dkpart(bp->b_dev); 1756 int labelsect = lp->d_partitions[0].p_offset; 1757 int maxsz = p->p_size, 1758 sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT; 1759 1760 /* overwriting disk label ? */ 1761 /* XXX should also protect bootstrap in first 8K */ 1762 if (bp->b_blkno + p->p_offset <= LABELSECTOR + labelsect && 1763#if LABELSECTOR != 0 1764 bp->b_blkno + p->p_offset + sz > LABELSECTOR + labelsect && 1765#endif 1766 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 1767 bp->b_error = EROFS; 1768 goto bad; 1769 } 1770 1771#if defined(DOSBBSECTOR) && defined(notyet) 1772 /* overwriting master boot record? */ 1773 if (bp->b_blkno + p->p_offset <= DOSBBSECTOR && 1774 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 1775 bp->b_error = EROFS; 1776 goto bad; 1777 } 1778#endif 1779 1780 /* beyond partition? */ 1781 if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz) { 1782 /* if exactly at end of disk, return an EOF */ 1783 if (bp->b_blkno == maxsz) { 1784 bp->b_resid = bp->b_bcount; 1785 return(0); 1786 } 1787 /* or truncate if part of it fits */ 1788 sz = maxsz - bp->b_blkno; 1789 if (sz <= 0) { 1790 bp->b_error = EINVAL; 1791 goto bad; 1792 } 1793 bp->b_bcount = sz << DEV_BSHIFT; 1794 } 1795 1796 /* calculate cylinder for disksort to order transfers with */ 1797 bp->b_pblkno = bp->b_blkno + p->p_offset; 1798 bp->b_cylin = bp->b_pblkno / lp->d_secpercyl; 1799 return(1); 1800 1801bad: 1802 bp->b_flags |= B_ERROR; 1803 return(-1); 1804} 1805 1806int 1807disk_externalize(int drive, void *userp, size_t *maxlen) 1808{ 1809 if(*maxlen < sizeof drive) { 1810 return ENOMEM; 1811 } 1812 1813 *maxlen -= sizeof drive; 1814 return copyout(&drive, userp, sizeof drive); 1815} 1816