machdep.c revision 24852
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 1.236 1997/04/07 07:15:50 peter Exp $ 39 */ 40 41#include "npx.h" 42#include "opt_sysvipc.h" 43#include "opt_ddb.h" 44#include "opt_bounce.h" 45#include "opt_machdep.h" 46#include "opt_perfmon.h" 47#include "opt_userconfig.h" 48 49#include <sys/param.h> 50#include <sys/systm.h> 51#include <sys/sysproto.h> 52#include <sys/signalvar.h> 53#include <sys/kernel.h> 54#include <sys/proc.h> 55#include <sys/buf.h> 56#include <sys/reboot.h> 57#include <sys/conf.h> 58#include <sys/file.h> 59#include <sys/callout.h> 60#include <sys/malloc.h> 61#include <sys/mbuf.h> 62#include <sys/mount.h> 63#include <sys/msgbuf.h> 64#include <sys/sysent.h> 65#include <sys/tty.h> 66#include <sys/sysctl.h> 67#include <sys/vmmeter.h> 68 69#ifdef SYSVSHM 70#include <sys/shm.h> 71#endif 72 73#ifdef SYSVMSG 74#include <sys/msg.h> 75#endif 76 77#ifdef SYSVSEM 78#include <sys/sem.h> 79#endif 80 81#include <vm/vm.h> 82#include <vm/vm_param.h> 83#include <vm/vm_prot.h> 84#include <sys/lock.h> 85#include <vm/vm_kern.h> 86#include <vm/vm_object.h> 87#include <vm/vm_page.h> 88#include <vm/vm_map.h> 89#include <vm/vm_pager.h> 90#include <vm/vm_extern.h> 91 92#include <sys/user.h> 93#include <sys/exec.h> 94#include <sys/vnode.h> 95 96#include <ddb/ddb.h> 97 98#include <net/netisr.h> 99 100#include <machine/cpu.h> 101#include <machine/npx.h> 102#include <machine/reg.h> 103#include <machine/psl.h> 104#include <machine/clock.h> 105#include <machine/specialreg.h> 106#include <machine/sysarch.h> 107#include <machine/cons.h> 108#include <machine/bootinfo.h> 109#include <machine/md_var.h> 110#ifdef PERFMON 111#include <machine/perfmon.h> 112#endif 113 114#include <i386/isa/isa_device.h> 115#include <i386/isa/rtc.h> 116#include <machine/random.h> 117 118extern void init386 __P((int first)); 119extern int ptrace_set_pc __P((struct proc *p, unsigned int addr)); 120extern int ptrace_single_step __P((struct proc *p)); 121extern int ptrace_write_u __P((struct proc *p, vm_offset_t off, int data)); 122extern void dblfault_handler __P((void)); 123 124extern void printcpuinfo(void); /* XXX header file */ 125extern void earlysetcpuclass(void); /* same header file */ 126extern void finishidentcpu(void); 127extern void panicifcpuunsupported(void); 128extern void initializecpu(void); 129 130static void cpu_startup __P((void *)); 131SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL) 132 133 134#ifdef BOUNCE_BUFFERS 135extern char *bouncememory; 136extern int maxbkva; 137#ifdef BOUNCEPAGES 138int bouncepages = BOUNCEPAGES; 139#else 140int bouncepages = 0; 141#endif 142#endif /* BOUNCE_BUFFERS */ 143 144extern int freebufspace; 145int msgbufmapped = 0; /* set when safe to use msgbuf */ 146int _udatasel, _ucodesel; 147u_int atdevbase; 148 149 150int physmem = 0; 151int cold = 1; 152 153static int 154sysctl_hw_physmem SYSCTL_HANDLER_ARGS 155{ 156 int error = sysctl_handle_int(oidp, 0, ctob(physmem), req); 157 return (error); 158} 159 160SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_INT|CTLFLAG_RD, 161 0, 0, sysctl_hw_physmem, "I", ""); 162 163static int 164sysctl_hw_usermem SYSCTL_HANDLER_ARGS 165{ 166 int error = sysctl_handle_int(oidp, 0, 167 ctob(physmem - cnt.v_wire_count), req); 168 return (error); 169} 170 171SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD, 172 0, 0, sysctl_hw_usermem, "I", ""); 173 174int boothowto = 0, bootverbose = 0, Maxmem = 0; 175static int badpages = 0; 176long dumplo; 177extern int bootdev; 178 179vm_offset_t phys_avail[10]; 180 181/* must be 2 less so 0 0 can signal end of chunks */ 182#define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(vm_offset_t)) - 2) 183 184static void setup_netisrs __P((struct linker_set *)); /* XXX declare elsewhere */ 185 186static vm_offset_t buffer_sva, buffer_eva; 187vm_offset_t clean_sva, clean_eva; 188static vm_offset_t pager_sva, pager_eva; 189extern struct linker_set netisr_set; 190 191#define offsetof(type, member) ((size_t)(&((type *)0)->member)) 192 193static void 194cpu_startup(dummy) 195 void *dummy; 196{ 197 register unsigned i; 198 register caddr_t v; 199 vm_offset_t maxaddr; 200 vm_size_t size = 0; 201 int firstaddr; 202 vm_offset_t minaddr; 203 204 if (boothowto & RB_VERBOSE) 205 bootverbose++; 206 207 /* 208 * Good {morning,afternoon,evening,night}. 209 */ 210 printf(version); 211 earlysetcpuclass(); 212 startrtclock(); 213 printcpuinfo(); 214 panicifcpuunsupported(); 215#ifdef PERFMON 216 perfmon_init(); 217#endif 218 printf("real memory = %d (%dK bytes)\n", ptoa(Maxmem), ptoa(Maxmem) / 1024); 219 /* 220 * Display any holes after the first chunk of extended memory. 221 */ 222 if (badpages != 0) { 223 int indx = 1; 224 225 /* 226 * XXX skip reporting ISA hole & unmanaged kernel memory 227 */ 228 if (phys_avail[0] == PAGE_SIZE) 229 indx += 2; 230 231 printf("Physical memory hole(s):\n"); 232 for (; phys_avail[indx + 1] != 0; indx += 2) { 233 int size = phys_avail[indx + 1] - phys_avail[indx]; 234 235 printf("0x%08lx - 0x%08lx, %d bytes (%d pages)\n", phys_avail[indx], 236 phys_avail[indx + 1] - 1, size, size / PAGE_SIZE); 237 } 238 } 239 240 /* 241 * Quickly wire in netisrs. 242 */ 243 setup_netisrs(&netisr_set); 244 245 /* 246 * Allocate space for system data structures. 247 * The first available kernel virtual address is in "v". 248 * As pages of kernel virtual memory are allocated, "v" is incremented. 249 * As pages of memory are allocated and cleared, 250 * "firstaddr" is incremented. 251 * An index into the kernel page table corresponding to the 252 * virtual memory address maintained in "v" is kept in "mapaddr". 253 */ 254 255 /* 256 * Make two passes. The first pass calculates how much memory is 257 * needed and allocates it. The second pass assigns virtual 258 * addresses to the various data structures. 259 */ 260 firstaddr = 0; 261again: 262 v = (caddr_t)firstaddr; 263 264#define valloc(name, type, num) \ 265 (name) = (type *)v; v = (caddr_t)((name)+(num)) 266#define valloclim(name, type, num, lim) \ 267 (name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num))) 268 valloc(callout, struct callout, ncallout); 269#ifdef SYSVSHM 270 valloc(shmsegs, struct shmid_ds, shminfo.shmmni); 271#endif 272#ifdef SYSVSEM 273 valloc(sema, struct semid_ds, seminfo.semmni); 274 valloc(sem, struct sem, seminfo.semmns); 275 /* This is pretty disgusting! */ 276 valloc(semu, int, (seminfo.semmnu * seminfo.semusz) / sizeof(int)); 277#endif 278#ifdef SYSVMSG 279 valloc(msgpool, char, msginfo.msgmax); 280 valloc(msgmaps, struct msgmap, msginfo.msgseg); 281 valloc(msghdrs, struct msg, msginfo.msgtql); 282 valloc(msqids, struct msqid_ds, msginfo.msgmni); 283#endif 284 285 if (nbuf == 0) { 286 nbuf = 30; 287 if( physmem > 1024) 288 nbuf += min((physmem - 1024) / 8, 2048); 289 } 290 nswbuf = max(min(nbuf/4, 128), 16); 291 292 valloc(swbuf, struct buf, nswbuf); 293 valloc(buf, struct buf, nbuf); 294 295#ifdef BOUNCE_BUFFERS 296 /* 297 * If there is more than 16MB of memory, allocate some bounce buffers 298 */ 299 if (Maxmem > 4096) { 300 if (bouncepages == 0) { 301 bouncepages = 64; 302 bouncepages += ((Maxmem - 4096) / 2048) * 32; 303 if (bouncepages > 128) 304 bouncepages = 128; 305 } 306 v = (caddr_t)((vm_offset_t)round_page(v)); 307 valloc(bouncememory, char, bouncepages * PAGE_SIZE); 308 } 309#endif 310 311 /* 312 * End of first pass, size has been calculated so allocate memory 313 */ 314 if (firstaddr == 0) { 315 size = (vm_size_t)(v - firstaddr); 316 firstaddr = (int)kmem_alloc(kernel_map, round_page(size)); 317 if (firstaddr == 0) 318 panic("startup: no room for tables"); 319 goto again; 320 } 321 322 /* 323 * End of second pass, addresses have been assigned 324 */ 325 if ((vm_size_t)(v - firstaddr) != size) 326 panic("startup: table size inconsistency"); 327 328#ifdef BOUNCE_BUFFERS 329 clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva, 330 (nbuf*BKVASIZE) + (nswbuf*MAXPHYS) + 331 maxbkva + pager_map_size, TRUE); 332 io_map = kmem_suballoc(clean_map, &minaddr, &maxaddr, maxbkva, FALSE); 333#else 334 clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva, 335 (nbuf*BKVASIZE) + (nswbuf*MAXPHYS) + pager_map_size, TRUE); 336#endif 337 buffer_map = kmem_suballoc(clean_map, &buffer_sva, &buffer_eva, 338 (nbuf*BKVASIZE), TRUE); 339 pager_map = kmem_suballoc(clean_map, &pager_sva, &pager_eva, 340 (nswbuf*MAXPHYS) + pager_map_size, TRUE); 341 exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, 342 (16*ARG_MAX), TRUE); 343 u_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, 344 (maxproc*UPAGES*PAGE_SIZE), FALSE); 345 346 /* 347 * Finally, allocate mbuf pool. Since mclrefcnt is an off-size 348 * we use the more space efficient malloc in place of kmem_alloc. 349 */ 350 { 351 vm_offset_t mb_map_size; 352 353 mb_map_size = nmbufs * MSIZE + nmbclusters * MCLBYTES; 354 mb_map_size = roundup2(mb_map_size, max(MCLBYTES, PAGE_SIZE)); 355 mclrefcnt = malloc(mb_map_size / MCLBYTES, M_MBUF, M_NOWAIT); 356 bzero(mclrefcnt, mb_map_size / MCLBYTES); 357 mb_map = kmem_suballoc(kmem_map, (vm_offset_t *)&mbutl, &maxaddr, 358 mb_map_size, FALSE); 359 } 360 361 /* 362 * Initialize callouts 363 */ 364 callfree = callout; 365 for (i = 1; i < ncallout; i++) 366 callout[i-1].c_next = &callout[i]; 367 368#if defined(USERCONFIG) 369#if defined(USERCONFIG_BOOT) 370 if (1) { 371#else 372 if (boothowto & RB_CONFIG) { 373#endif 374 userconfig(); 375 cninit(); /* the preferred console may have changed */ 376 } 377#endif 378 379#ifdef BOUNCE_BUFFERS 380 /* 381 * init bounce buffers 382 */ 383 vm_bounce_init(); 384#endif 385 386 printf("avail memory = %d (%dK bytes)\n", ptoa(cnt.v_free_count), 387 ptoa(cnt.v_free_count) / 1024); 388 389 /* 390 * Set up buffers, so they can be used to read disk labels. 391 */ 392 bufinit(); 393 vm_pager_bufferinit(); 394} 395 396int 397register_netisr(num, handler) 398 int num; 399 netisr_t *handler; 400{ 401 402 if (num < 0 || num >= (sizeof(netisrs)/sizeof(*netisrs)) ) { 403 printf("register_netisr: bad isr number: %d\n", num); 404 return (EINVAL); 405 } 406 netisrs[num] = handler; 407 return (0); 408} 409 410static void 411setup_netisrs(ls) 412 struct linker_set *ls; 413{ 414 int i; 415 const struct netisrtab *nit; 416 417 for(i = 0; ls->ls_items[i]; i++) { 418 nit = (const struct netisrtab *)ls->ls_items[i]; 419 register_netisr(nit->nit_num, nit->nit_isr); 420 } 421} 422 423/* 424 * Send an interrupt to process. 425 * 426 * Stack is set up to allow sigcode stored 427 * at top to call routine, followed by kcall 428 * to sigreturn routine below. After sigreturn 429 * resets the signal mask, the stack, and the 430 * frame pointer, it returns to the user 431 * specified pc, psl. 432 */ 433void 434sendsig(catcher, sig, mask, code) 435 sig_t catcher; 436 int sig, mask; 437 u_long code; 438{ 439 register struct proc *p = curproc; 440 register int *regs; 441 register struct sigframe *fp; 442 struct sigframe sf; 443 struct sigacts *psp = p->p_sigacts; 444 int oonstack; 445 446 regs = p->p_md.md_regs; 447 oonstack = psp->ps_sigstk.ss_flags & SS_ONSTACK; 448 /* 449 * Allocate and validate space for the signal handler context. 450 */ 451 if ((psp->ps_flags & SAS_ALTSTACK) && !oonstack && 452 (psp->ps_sigonstack & sigmask(sig))) { 453 fp = (struct sigframe *)(psp->ps_sigstk.ss_sp + 454 psp->ps_sigstk.ss_size - sizeof(struct sigframe)); 455 psp->ps_sigstk.ss_flags |= SS_ONSTACK; 456 } else { 457 fp = (struct sigframe *)regs[tESP] - 1; 458 } 459 460 /* 461 * grow() will return FALSE if the fp will not fit inside the stack 462 * and the stack can not be grown. useracc will return FALSE 463 * if access is denied. 464 */ 465 if ((grow(p, (int)fp) == FALSE) || 466 (useracc((caddr_t)fp, sizeof (struct sigframe), B_WRITE) == FALSE)) { 467 /* 468 * Process has trashed its stack; give it an illegal 469 * instruction to halt it in its tracks. 470 */ 471 SIGACTION(p, SIGILL) = SIG_DFL; 472 sig = sigmask(SIGILL); 473 p->p_sigignore &= ~sig; 474 p->p_sigcatch &= ~sig; 475 p->p_sigmask &= ~sig; 476 psignal(p, SIGILL); 477 return; 478 } 479 480 /* 481 * Build the argument list for the signal handler. 482 */ 483 if (p->p_sysent->sv_sigtbl) { 484 if (sig < p->p_sysent->sv_sigsize) 485 sig = p->p_sysent->sv_sigtbl[sig]; 486 else 487 sig = p->p_sysent->sv_sigsize + 1; 488 } 489 sf.sf_signum = sig; 490 sf.sf_code = code; 491 sf.sf_scp = &fp->sf_sc; 492 sf.sf_addr = (char *) regs[tERR]; 493 sf.sf_handler = catcher; 494 495 /* save scratch registers */ 496 sf.sf_sc.sc_eax = regs[tEAX]; 497 sf.sf_sc.sc_ebx = regs[tEBX]; 498 sf.sf_sc.sc_ecx = regs[tECX]; 499 sf.sf_sc.sc_edx = regs[tEDX]; 500 sf.sf_sc.sc_esi = regs[tESI]; 501 sf.sf_sc.sc_edi = regs[tEDI]; 502 sf.sf_sc.sc_cs = regs[tCS]; 503 sf.sf_sc.sc_ds = regs[tDS]; 504 sf.sf_sc.sc_ss = regs[tSS]; 505 sf.sf_sc.sc_es = regs[tES]; 506 sf.sf_sc.sc_isp = regs[tISP]; 507 508 /* 509 * Build the signal context to be used by sigreturn. 510 */ 511 sf.sf_sc.sc_onstack = oonstack; 512 sf.sf_sc.sc_mask = mask; 513 sf.sf_sc.sc_sp = regs[tESP]; 514 sf.sf_sc.sc_fp = regs[tEBP]; 515 sf.sf_sc.sc_pc = regs[tEIP]; 516 sf.sf_sc.sc_ps = regs[tEFLAGS]; 517 518 /* 519 * Copy the sigframe out to the user's stack. 520 */ 521 if (copyout(&sf, fp, sizeof(struct sigframe)) != 0) { 522 /* 523 * Something is wrong with the stack pointer. 524 * ...Kill the process. 525 */ 526 sigexit(p, SIGILL); 527 }; 528 529 regs[tESP] = (int)fp; 530 regs[tEIP] = (int)(((char *)PS_STRINGS) - *(p->p_sysent->sv_szsigcode)); 531 regs[tEFLAGS] &= ~PSL_VM; 532 regs[tCS] = _ucodesel; 533 regs[tDS] = _udatasel; 534 regs[tES] = _udatasel; 535 regs[tSS] = _udatasel; 536} 537 538/* 539 * System call to cleanup state after a signal 540 * has been taken. Reset signal mask and 541 * stack state from context left by sendsig (above). 542 * Return to previous pc and psl as specified by 543 * context left by sendsig. Check carefully to 544 * make sure that the user has not modified the 545 * state to gain improper privileges. 546 */ 547int 548sigreturn(p, uap, retval) 549 struct proc *p; 550 struct sigreturn_args /* { 551 struct sigcontext *sigcntxp; 552 } */ *uap; 553 int *retval; 554{ 555 register struct sigcontext *scp; 556 register struct sigframe *fp; 557 register int *regs = p->p_md.md_regs; 558 int eflags; 559 560 /* 561 * (XXX old comment) regs[tESP] points to the return address. 562 * The user scp pointer is above that. 563 * The return address is faked in the signal trampoline code 564 * for consistency. 565 */ 566 scp = uap->sigcntxp; 567 fp = (struct sigframe *) 568 ((caddr_t)scp - offsetof(struct sigframe, sf_sc)); 569 570 if (useracc((caddr_t)fp, sizeof (*fp), B_WRITE) == 0) 571 return(EFAULT); 572 573 /* 574 * Don't allow users to change privileged or reserved flags. 575 */ 576#define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 577 eflags = scp->sc_ps; 578 /* 579 * XXX do allow users to change the privileged flag PSL_RF. The 580 * cpu sets PSL_RF in tf_eflags for faults. Debuggers should 581 * sometimes set it there too. tf_eflags is kept in the signal 582 * context during signal handling and there is no other place 583 * to remember it, so the PSL_RF bit may be corrupted by the 584 * signal handler without us knowing. Corruption of the PSL_RF 585 * bit at worst causes one more or one less debugger trap, so 586 * allowing it is fairly harmless. 587 */ 588 if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs[tEFLAGS] & ~PSL_RF)) { 589#ifdef DEBUG 590 printf("sigreturn: eflags = 0x%x\n", eflags); 591#endif 592 return(EINVAL); 593 } 594 595 /* 596 * Don't allow users to load a valid privileged %cs. Let the 597 * hardware check for invalid selectors, excess privilege in 598 * other selectors, invalid %eip's and invalid %esp's. 599 */ 600#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 601 if (!CS_SECURE(scp->sc_cs)) { 602#ifdef DEBUG 603 printf("sigreturn: cs = 0x%x\n", scp->sc_cs); 604#endif 605 trapsignal(p, SIGBUS, T_PROTFLT); 606 return(EINVAL); 607 } 608 609 /* restore scratch registers */ 610 regs[tEAX] = scp->sc_eax; 611 regs[tEBX] = scp->sc_ebx; 612 regs[tECX] = scp->sc_ecx; 613 regs[tEDX] = scp->sc_edx; 614 regs[tESI] = scp->sc_esi; 615 regs[tEDI] = scp->sc_edi; 616 regs[tCS] = scp->sc_cs; 617 regs[tDS] = scp->sc_ds; 618 regs[tES] = scp->sc_es; 619 regs[tSS] = scp->sc_ss; 620 regs[tISP] = scp->sc_isp; 621 622 if (useracc((caddr_t)scp, sizeof (*scp), B_WRITE) == 0) 623 return(EINVAL); 624 625 if (scp->sc_onstack & 01) 626 p->p_sigacts->ps_sigstk.ss_flags |= SS_ONSTACK; 627 else 628 p->p_sigacts->ps_sigstk.ss_flags &= ~SS_ONSTACK; 629 p->p_sigmask = scp->sc_mask & ~sigcantmask; 630 regs[tEBP] = scp->sc_fp; 631 regs[tESP] = scp->sc_sp; 632 regs[tEIP] = scp->sc_pc; 633 regs[tEFLAGS] = eflags; 634 return(EJUSTRETURN); 635} 636 637/* 638 * Machine dependent boot() routine 639 * 640 * I haven't seen anything to put here yet 641 * Possibly some stuff might be grafted back here from boot() 642 */ 643void 644cpu_boot(int howto) 645{ 646} 647 648/* 649 * Shutdown the CPU as much as possible 650 */ 651void 652cpu_halt(void) 653{ 654 for (;;) 655 __asm__ ("hlt"); 656} 657 658/* 659 * Clear registers on exec 660 */ 661void 662setregs(p, entry, stack) 663 struct proc *p; 664 u_long entry; 665 u_long stack; 666{ 667 int *regs = p->p_md.md_regs; 668 669#ifdef USER_LDT 670 struct pcb *pcb = &p->p_addr->u_pcb; 671 672 /* was i386_user_cleanup() in NetBSD */ 673 if (pcb->pcb_ldt) { 674 if (pcb == curpcb) 675 lldt(GSEL(GUSERLDT_SEL, SEL_KPL)); 676 kmem_free(kernel_map, (vm_offset_t)pcb->pcb_ldt, 677 pcb->pcb_ldt_len * sizeof(union descriptor)); 678 pcb->pcb_ldt_len = (int)pcb->pcb_ldt = 0; 679 } 680#endif 681 682 bzero(regs, sizeof(struct trapframe)); 683 regs[tEIP] = entry; 684 regs[tESP] = stack; 685 regs[tEFLAGS] = PSL_USER | (regs[tEFLAGS] & PSL_T); 686 regs[tSS] = _udatasel; 687 regs[tDS] = _udatasel; 688 regs[tES] = _udatasel; 689 regs[tCS] = _ucodesel; 690 691 /* 692 * Initialize the math emulator (if any) for the current process. 693 * Actually, just clear the bit that says that the emulator has 694 * been initialized. Initialization is delayed until the process 695 * traps to the emulator (if it is done at all) mainly because 696 * emulators don't provide an entry point for initialization. 697 */ 698 p->p_addr->u_pcb.pcb_flags &= ~FP_SOFTFP; 699 700 /* 701 * Arrange to trap the next npx or `fwait' instruction (see npx.c 702 * for why fwait must be trapped at least if there is an npx or an 703 * emulator). This is mainly to handle the case where npx0 is not 704 * configured, since the npx routines normally set up the trap 705 * otherwise. It should be done only at boot time, but doing it 706 * here allows modifying `npx_exists' for testing the emulator on 707 * systems with an npx. 708 */ 709 load_cr0(rcr0() | CR0_MP | CR0_TS); 710 711#if NNPX > 0 712 /* Initialize the npx (if any) for the current process. */ 713 npxinit(__INITIAL_NPXCW__); 714#endif 715} 716 717static int 718sysctl_machdep_adjkerntz SYSCTL_HANDLER_ARGS 719{ 720 int error; 721 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 722 req); 723 if (!error && req->newptr) 724 resettodr(); 725 return (error); 726} 727 728SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 729 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 730 731SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, 732 CTLFLAG_RW, &disable_rtc_set, 0, ""); 733 734SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo, 735 CTLFLAG_RD, &bootinfo, bootinfo, ""); 736 737SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock, 738 CTLFLAG_RW, &wall_cmos_clock, 0, ""); 739 740/* 741 * Initialize 386 and configure to run kernel 742 */ 743 744/* 745 * Initialize segments & interrupt table 746 */ 747 748int currentldt; 749int _default_ldt; 750union descriptor gdt[NGDT]; /* global descriptor table */ 751struct gate_descriptor idt[NIDT]; /* interrupt descriptor table */ 752union descriptor ldt[NLDT]; /* local descriptor table */ 753struct i386tss common_tss; 754 755static struct i386tss dblfault_tss; 756static char dblfault_stack[PAGE_SIZE]; 757 758extern struct user *proc0paddr; 759 760#ifdef TSS_IS_CACHED /* cpu_switch helper */ 761struct segment_descriptor *tssptr; 762int gsel_tss; 763#endif 764 765/* software prototypes -- in more palatable form */ 766struct soft_segment_descriptor gdt_segs[] = { 767/* GNULL_SEL 0 Null Descriptor */ 768{ 0x0, /* segment base address */ 769 0x0, /* length */ 770 0, /* segment type */ 771 0, /* segment descriptor priority level */ 772 0, /* segment descriptor present */ 773 0, 0, 774 0, /* default 32 vs 16 bit size */ 775 0 /* limit granularity (byte/page units)*/ }, 776/* GCODE_SEL 1 Code Descriptor for kernel */ 777{ 0x0, /* segment base address */ 778 0xfffff, /* length - all address space */ 779 SDT_MEMERA, /* segment type */ 780 0, /* segment descriptor priority level */ 781 1, /* segment descriptor present */ 782 0, 0, 783 1, /* default 32 vs 16 bit size */ 784 1 /* limit granularity (byte/page units)*/ }, 785/* GDATA_SEL 2 Data Descriptor for kernel */ 786{ 0x0, /* segment base address */ 787 0xfffff, /* length - all address space */ 788 SDT_MEMRWA, /* segment type */ 789 0, /* segment descriptor priority level */ 790 1, /* segment descriptor present */ 791 0, 0, 792 1, /* default 32 vs 16 bit size */ 793 1 /* limit granularity (byte/page units)*/ }, 794/* GLDT_SEL 3 LDT Descriptor */ 795{ (int) ldt, /* segment base address */ 796 sizeof(ldt)-1, /* length - all address space */ 797 SDT_SYSLDT, /* segment type */ 798 SEL_UPL, /* segment descriptor priority level */ 799 1, /* segment descriptor present */ 800 0, 0, 801 0, /* unused - default 32 vs 16 bit size */ 802 0 /* limit granularity (byte/page units)*/ }, 803/* GTGATE_SEL 4 Null Descriptor - Placeholder */ 804{ 0x0, /* segment base address */ 805 0x0, /* length - all address space */ 806 0, /* segment type */ 807 0, /* segment descriptor priority level */ 808 0, /* segment descriptor present */ 809 0, 0, 810 0, /* default 32 vs 16 bit size */ 811 0 /* limit granularity (byte/page units)*/ }, 812/* GPANIC_SEL 5 Panic Tss Descriptor */ 813{ (int) &dblfault_tss, /* segment base address */ 814 sizeof(struct i386tss)-1,/* length - all address space */ 815 SDT_SYS386TSS, /* segment type */ 816 0, /* segment descriptor priority level */ 817 1, /* segment descriptor present */ 818 0, 0, 819 0, /* unused - default 32 vs 16 bit size */ 820 0 /* limit granularity (byte/page units)*/ }, 821/* GPROC0_SEL 6 Proc 0 Tss Descriptor */ 822{ (int) &common_tss, /* segment base address */ 823 sizeof(struct i386tss)-1,/* length - all address space */ 824 SDT_SYS386TSS, /* segment type */ 825 0, /* segment descriptor priority level */ 826 1, /* segment descriptor present */ 827 0, 0, 828 0, /* unused - default 32 vs 16 bit size */ 829 0 /* limit granularity (byte/page units)*/ }, 830/* GUSERLDT_SEL 7 User LDT Descriptor per process */ 831{ (int) ldt, /* segment base address */ 832 (512 * sizeof(union descriptor)-1), /* length */ 833 SDT_SYSLDT, /* segment type */ 834 0, /* segment descriptor priority level */ 835 1, /* segment descriptor present */ 836 0, 0, 837 0, /* unused - default 32 vs 16 bit size */ 838 0 /* limit granularity (byte/page units)*/ }, 839/* GAPMCODE32_SEL 8 APM BIOS 32-bit interface (32bit Code) */ 840{ 0, /* segment base address (overwritten by APM) */ 841 0xfffff, /* length */ 842 SDT_MEMERA, /* segment type */ 843 0, /* segment descriptor priority level */ 844 1, /* segment descriptor present */ 845 0, 0, 846 1, /* default 32 vs 16 bit size */ 847 1 /* limit granularity (byte/page units)*/ }, 848/* GAPMCODE16_SEL 9 APM BIOS 32-bit interface (16bit Code) */ 849{ 0, /* segment base address (overwritten by APM) */ 850 0xfffff, /* length */ 851 SDT_MEMERA, /* segment type */ 852 0, /* segment descriptor priority level */ 853 1, /* segment descriptor present */ 854 0, 0, 855 0, /* default 32 vs 16 bit size */ 856 1 /* limit granularity (byte/page units)*/ }, 857/* GAPMDATA_SEL 10 APM BIOS 32-bit interface (Data) */ 858{ 0, /* segment base address (overwritten by APM) */ 859 0xfffff, /* length */ 860 SDT_MEMRWA, /* segment type */ 861 0, /* segment descriptor priority level */ 862 1, /* segment descriptor present */ 863 0, 0, 864 1, /* default 32 vs 16 bit size */ 865 1 /* limit granularity (byte/page units)*/ }, 866}; 867 868static struct soft_segment_descriptor ldt_segs[] = { 869 /* Null Descriptor - overwritten by call gate */ 870{ 0x0, /* segment base address */ 871 0x0, /* length - all address space */ 872 0, /* segment type */ 873 0, /* segment descriptor priority level */ 874 0, /* segment descriptor present */ 875 0, 0, 876 0, /* default 32 vs 16 bit size */ 877 0 /* limit granularity (byte/page units)*/ }, 878 /* Null Descriptor - overwritten by call gate */ 879{ 0x0, /* segment base address */ 880 0x0, /* length - all address space */ 881 0, /* segment type */ 882 0, /* segment descriptor priority level */ 883 0, /* segment descriptor present */ 884 0, 0, 885 0, /* default 32 vs 16 bit size */ 886 0 /* limit granularity (byte/page units)*/ }, 887 /* Null Descriptor - overwritten by call gate */ 888{ 0x0, /* segment base address */ 889 0x0, /* length - all address space */ 890 0, /* segment type */ 891 0, /* segment descriptor priority level */ 892 0, /* segment descriptor present */ 893 0, 0, 894 0, /* default 32 vs 16 bit size */ 895 0 /* limit granularity (byte/page units)*/ }, 896 /* Code Descriptor for user */ 897{ 0x0, /* segment base address */ 898 0xfffff, /* length - all address space */ 899 SDT_MEMERA, /* segment type */ 900 SEL_UPL, /* segment descriptor priority level */ 901 1, /* segment descriptor present */ 902 0, 0, 903 1, /* default 32 vs 16 bit size */ 904 1 /* limit granularity (byte/page units)*/ }, 905 /* Data Descriptor for user */ 906{ 0x0, /* segment base address */ 907 0xfffff, /* length - all address space */ 908 SDT_MEMRWA, /* segment type */ 909 SEL_UPL, /* segment descriptor priority level */ 910 1, /* segment descriptor present */ 911 0, 0, 912 1, /* default 32 vs 16 bit size */ 913 1 /* limit granularity (byte/page units)*/ }, 914}; 915 916void 917setidt(idx, func, typ, dpl, selec) 918 int idx; 919 inthand_t *func; 920 int typ; 921 int dpl; 922 int selec; 923{ 924 struct gate_descriptor *ip = idt + idx; 925 926 ip->gd_looffset = (int)func; 927 ip->gd_selector = selec; 928 ip->gd_stkcpy = 0; 929 ip->gd_xx = 0; 930 ip->gd_type = typ; 931 ip->gd_dpl = dpl; 932 ip->gd_p = 1; 933 ip->gd_hioffset = ((int)func)>>16 ; 934} 935 936#define IDTVEC(name) __CONCAT(X,name) 937 938extern inthand_t 939 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 940 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 941 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 942 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 943 IDTVEC(syscall), IDTVEC(int0x80_syscall); 944 945void 946sdtossd(sd, ssd) 947 struct segment_descriptor *sd; 948 struct soft_segment_descriptor *ssd; 949{ 950 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 951 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 952 ssd->ssd_type = sd->sd_type; 953 ssd->ssd_dpl = sd->sd_dpl; 954 ssd->ssd_p = sd->sd_p; 955 ssd->ssd_def32 = sd->sd_def32; 956 ssd->ssd_gran = sd->sd_gran; 957} 958 959void 960init386(first) 961 int first; 962{ 963 int x; 964 unsigned biosbasemem, biosextmem; 965 struct gate_descriptor *gdp; 966#ifndef TSS_IS_CACHED 967 int gsel_tss; 968#endif 969 struct isa_device *idp; 970 /* table descriptors - used to load tables by microp */ 971 struct region_descriptor r_gdt, r_idt; 972 int pagesinbase, pagesinext; 973 int target_page, pa_indx; 974 int off; 975 976 proc0.p_addr = proc0paddr; 977 978 atdevbase = ISA_HOLE_START + KERNBASE; 979 980 /* 981 * Initialize the console before we print anything out. 982 */ 983 cninit(); 984 985 /* 986 * make gdt memory segments, the code segment goes up to end of the 987 * page with etext in it, the data segment goes to the end of 988 * the address space 989 */ 990 /* 991 * XXX text protection is temporarily (?) disabled. The limit was 992 * i386_btop(round_page(etext)) - 1. 993 */ 994 gdt_segs[GCODE_SEL].ssd_limit = i386_btop(0) - 1; 995 gdt_segs[GDATA_SEL].ssd_limit = i386_btop(0) - 1; 996 for (x = 0; x < NGDT; x++) 997 ssdtosd(&gdt_segs[x], &gdt[x].sd); 998 999 /* make ldt memory segments */ 1000 /* 1001 * The data segment limit must not cover the user area because we 1002 * don't want the user area to be writable in copyout() etc. (page 1003 * level protection is lost in kernel mode on 386's). Also, we 1004 * don't want the user area to be writable directly (page level 1005 * protection of the user area is not available on 486's with 1006 * CR0_WP set, because there is no user-read/kernel-write mode). 1007 * 1008 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it 1009 * should be spelled ...MAX_USER... 1010 */ 1011#define VM_END_USER_RW_ADDRESS VM_MAXUSER_ADDRESS 1012 /* 1013 * The code segment limit has to cover the user area until we move 1014 * the signal trampoline out of the user area. This is safe because 1015 * the code segment cannot be written to directly. 1016 */ 1017#define VM_END_USER_R_ADDRESS (VM_END_USER_RW_ADDRESS + UPAGES * PAGE_SIZE) 1018 ldt_segs[LUCODE_SEL].ssd_limit = i386_btop(VM_END_USER_R_ADDRESS) - 1; 1019 ldt_segs[LUDATA_SEL].ssd_limit = i386_btop(VM_END_USER_RW_ADDRESS) - 1; 1020 /* Note. eventually want private ldts per process */ 1021 for (x = 0; x < NLDT; x++) 1022 ssdtosd(&ldt_segs[x], &ldt[x].sd); 1023 1024 /* exceptions */ 1025 for (x = 0; x < NIDT; x++) 1026 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1027 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1028 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1029 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1030 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1031 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1032 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1033 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1034 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1035 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL)); 1036 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1037 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1038 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1039 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1040 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1041 setidt(14, &IDTVEC(page), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1042 setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1043 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1044 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1045 setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1046 setidt(0x80, &IDTVEC(int0x80_syscall), 1047 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1048 1049#include "isa.h" 1050#if NISA >0 1051 isa_defaultirq(); 1052#endif 1053 rand_initialize(); 1054 1055 r_gdt.rd_limit = sizeof(gdt) - 1; 1056 r_gdt.rd_base = (int) gdt; 1057 lgdt(&r_gdt); 1058 1059 r_idt.rd_limit = sizeof(idt) - 1; 1060 r_idt.rd_base = (int) idt; 1061 lidt(&r_idt); 1062 1063 _default_ldt = GSEL(GLDT_SEL, SEL_KPL); 1064 lldt(_default_ldt); 1065 currentldt = _default_ldt; 1066 1067#ifdef DDB 1068 kdb_init(); 1069 if (boothowto & RB_KDB) 1070 Debugger("Boot flags requested debugger"); 1071#endif 1072 1073 finishidentcpu(); /* Final stage of CPU initialization */ 1074 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1075 initializecpu(); /* Initialize CPU registers */ 1076 1077 /* Use BIOS values stored in RTC CMOS RAM, since probing 1078 * breaks certain 386 AT relics. 1079 */ 1080 biosbasemem = rtcin(RTC_BASELO)+ (rtcin(RTC_BASEHI)<<8); 1081 biosextmem = rtcin(RTC_EXTLO)+ (rtcin(RTC_EXTHI)<<8); 1082 1083 /* 1084 * If BIOS tells us that it has more than 640k in the basemem, 1085 * don't believe it - set it to 640k. 1086 */ 1087 if (biosbasemem > 640) { 1088 printf("Preposterous RTC basemem of %dK, truncating to 640K\n", 1089 biosbasemem); 1090 biosbasemem = 640; 1091 } 1092 if (bootinfo.bi_memsizes_valid && bootinfo.bi_basemem > 640) { 1093 printf("Preposterous BIOS basemem of %dK, truncating to 640K\n", 1094 bootinfo.bi_basemem); 1095 bootinfo.bi_basemem = 640; 1096 } 1097 1098 /* 1099 * Warn if the official BIOS interface disagrees with the RTC 1100 * interface used above about the amount of base memory or the 1101 * amount of extended memory. Prefer the BIOS value for the base 1102 * memory. This is necessary for machines that `steal' base 1103 * memory for use as BIOS memory, at least if we are going to use 1104 * the BIOS for apm. Prefer the RTC value for extended memory. 1105 * Eventually the hackish interface shouldn't even be looked at. 1106 */ 1107 if (bootinfo.bi_memsizes_valid) { 1108 if (bootinfo.bi_basemem != biosbasemem) { 1109 vm_offset_t pa; 1110 1111 printf( 1112 "BIOS basemem (%ldK) != RTC basemem (%dK), setting to BIOS value\n", 1113 bootinfo.bi_basemem, biosbasemem); 1114 biosbasemem = bootinfo.bi_basemem; 1115 1116 /* 1117 * XXX if biosbasemem is now < 640, there is `hole' 1118 * between the end of base memory and the start of 1119 * ISA memory. The hole may be empty or it may 1120 * contain BIOS code or data. Map it read/write so 1121 * that the BIOS can write to it. (Memory from 0 to 1122 * the physical end of the kernel is mapped read-only 1123 * to begin with and then parts of it are remapped. 1124 * The parts that aren't remapped form holes that 1125 * remain read-only and are unused by the kernel. 1126 * The base memory area is below the physical end of 1127 * the kernel and right now forms a read-only hole. 1128 * The part of it from 0 to 1129 * (trunc_page(biosbasemem * 1024) - 1) will be 1130 * remapped and used by the kernel later.) 1131 * 1132 * This code is similar to the code used in 1133 * pmap_mapdev, but since no memory needs to be 1134 * allocated we simply change the mapping. 1135 */ 1136 for (pa = trunc_page(biosbasemem * 1024); 1137 pa < ISA_HOLE_START; pa += PAGE_SIZE) { 1138 unsigned *pte; 1139 1140 pte = (unsigned *)vtopte(pa + KERNBASE); 1141 *pte = pa | PG_RW | PG_V; 1142 } 1143 } 1144 if (bootinfo.bi_extmem != biosextmem) 1145 printf("BIOS extmem (%ldK) != RTC extmem (%dK)\n", 1146 bootinfo.bi_extmem, biosextmem); 1147 } 1148 1149 pagesinbase = biosbasemem * 1024 / PAGE_SIZE; 1150 pagesinext = biosextmem * 1024 / PAGE_SIZE; 1151 1152 /* 1153 * Special hack for chipsets that still remap the 384k hole when 1154 * there's 16MB of memory - this really confuses people that 1155 * are trying to use bus mastering ISA controllers with the 1156 * "16MB limit"; they only have 16MB, but the remapping puts 1157 * them beyond the limit. 1158 */ 1159 /* 1160 * If extended memory is between 15-16MB (16-17MB phys address range), 1161 * chop it to 15MB. 1162 */ 1163 if ((pagesinext > 3840) && (pagesinext < 4096)) 1164 pagesinext = 3840; 1165 1166 /* 1167 * Maxmem isn't the "maximum memory", it's one larger than the 1168 * highest page of the physical address space. It should be 1169 * called something like "Maxphyspage". 1170 */ 1171 Maxmem = pagesinext + 0x100000/PAGE_SIZE; 1172 1173#ifdef MAXMEM 1174 Maxmem = MAXMEM/4; 1175#endif 1176 1177#if NNPX > 0 1178 idp = find_isadev(isa_devtab_null, &npxdriver, 0); 1179 if (idp != NULL && idp->id_msize != 0) 1180 Maxmem = idp->id_msize / 4; 1181#endif 1182 1183 /* call pmap initialization to make new kernel address space */ 1184 pmap_bootstrap (first, 0); 1185 1186 /* 1187 * Size up each available chunk of physical memory. 1188 */ 1189 1190 /* 1191 * We currently don't bother testing base memory. 1192 * XXX ...but we probably should. 1193 */ 1194 pa_indx = 0; 1195 badpages = 0; 1196 if (pagesinbase > 1) { 1197 phys_avail[pa_indx++] = PAGE_SIZE; /* skip first page of memory */ 1198 phys_avail[pa_indx] = ptoa(pagesinbase);/* memory up to the ISA hole */ 1199 physmem = pagesinbase - 1; 1200 } else { 1201 /* point at first chunk end */ 1202 pa_indx++; 1203 } 1204 1205 for (target_page = avail_start; target_page < ptoa(Maxmem); target_page += PAGE_SIZE) { 1206 int tmp, page_bad = FALSE; 1207 1208 /* 1209 * map page into kernel: valid, read/write, non-cacheable 1210 */ 1211 *(int *)CMAP1 = PG_V | PG_RW | PG_N | target_page; 1212 invltlb(); 1213 1214 tmp = *(int *)CADDR1; 1215 /* 1216 * Test for alternating 1's and 0's 1217 */ 1218 *(volatile int *)CADDR1 = 0xaaaaaaaa; 1219 if (*(volatile int *)CADDR1 != 0xaaaaaaaa) { 1220 page_bad = TRUE; 1221 } 1222 /* 1223 * Test for alternating 0's and 1's 1224 */ 1225 *(volatile int *)CADDR1 = 0x55555555; 1226 if (*(volatile int *)CADDR1 != 0x55555555) { 1227 page_bad = TRUE; 1228 } 1229 /* 1230 * Test for all 1's 1231 */ 1232 *(volatile int *)CADDR1 = 0xffffffff; 1233 if (*(volatile int *)CADDR1 != 0xffffffff) { 1234 page_bad = TRUE; 1235 } 1236 /* 1237 * Test for all 0's 1238 */ 1239 *(volatile int *)CADDR1 = 0x0; 1240 if (*(volatile int *)CADDR1 != 0x0) { 1241 /* 1242 * test of page failed 1243 */ 1244 page_bad = TRUE; 1245 } 1246 /* 1247 * Restore original value. 1248 */ 1249 *(int *)CADDR1 = tmp; 1250 1251 /* 1252 * Adjust array of valid/good pages. 1253 */ 1254 if (page_bad == FALSE) { 1255 /* 1256 * If this good page is a continuation of the 1257 * previous set of good pages, then just increase 1258 * the end pointer. Otherwise start a new chunk. 1259 * Note that "end" points one higher than end, 1260 * making the range >= start and < end. 1261 */ 1262 if (phys_avail[pa_indx] == target_page) { 1263 phys_avail[pa_indx] += PAGE_SIZE; 1264 } else { 1265 pa_indx++; 1266 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 1267 printf("Too many holes in the physical address space, giving up\n"); 1268 pa_indx--; 1269 break; 1270 } 1271 phys_avail[pa_indx++] = target_page; /* start */ 1272 phys_avail[pa_indx] = target_page + PAGE_SIZE; /* end */ 1273 } 1274 physmem++; 1275 } else { 1276 badpages++; 1277 page_bad = FALSE; 1278 } 1279 } 1280 1281 *(int *)CMAP1 = 0; 1282 invltlb(); 1283 1284 /* 1285 * XXX 1286 * The last chunk must contain at least one page plus the message 1287 * buffer to avoid complicating other code (message buffer address 1288 * calculation, etc.). 1289 */ 1290 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 1291 round_page(sizeof(struct msgbuf)) >= phys_avail[pa_indx]) { 1292 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 1293 phys_avail[pa_indx--] = 0; 1294 phys_avail[pa_indx--] = 0; 1295 } 1296 1297 Maxmem = atop(phys_avail[pa_indx]); 1298 1299 /* Trim off space for the message buffer. */ 1300 phys_avail[pa_indx] -= round_page(sizeof(struct msgbuf)); 1301 1302 avail_end = phys_avail[pa_indx]; 1303 1304 /* now running on new page tables, configured,and u/iom is accessible */ 1305 1306 /* Map the message buffer. */ 1307 for (off = 0; off < round_page(sizeof(struct msgbuf)); off += PAGE_SIZE) 1308 pmap_enter(kernel_pmap, (vm_offset_t)msgbufp + off, 1309 avail_end + off, VM_PROT_ALL, TRUE); 1310 msgbufmapped = 1; 1311 1312 /* make an initial tss so cpu can get interrupt stack on syscall! */ 1313 common_tss.tss_esp0 = (int) proc0.p_addr + UPAGES*PAGE_SIZE; 1314 common_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ; 1315 common_tss.tss_ioopt = (sizeof common_tss) << 16; 1316 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 1317 ltr(gsel_tss); 1318 1319 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 = 1320 dblfault_tss.tss_esp2 = (int) &dblfault_stack[sizeof(dblfault_stack)]; 1321 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 = 1322 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL); 1323 dblfault_tss.tss_cr3 = IdlePTD; 1324 dblfault_tss.tss_eip = (int) dblfault_handler; 1325 dblfault_tss.tss_eflags = PSL_KERNEL; 1326 dblfault_tss.tss_ds = dblfault_tss.tss_es = dblfault_tss.tss_fs = 1327 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL); 1328 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL); 1329 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL); 1330 1331#ifdef TSS_IS_CACHED /* cpu_switch helper */ 1332 tssptr = &gdt[GPROC0_SEL].sd; 1333#endif 1334 1335 /* make a call gate to reenter kernel with */ 1336 gdp = &ldt[LSYS5CALLS_SEL].gd; 1337 1338 x = (int) &IDTVEC(syscall); 1339 gdp->gd_looffset = x++; 1340 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL); 1341 gdp->gd_stkcpy = 1; 1342 gdp->gd_type = SDT_SYS386CGT; 1343 gdp->gd_dpl = SEL_UPL; 1344 gdp->gd_p = 1; 1345 gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16; 1346 1347 /* XXX does this work? */ 1348 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL]; 1349 1350 /* transfer to user mode */ 1351 1352 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL); 1353 _udatasel = LSEL(LUDATA_SEL, SEL_UPL); 1354 1355 /* setup proc 0's pcb */ 1356 proc0.p_addr->u_pcb.pcb_flags = 0; 1357 proc0.p_addr->u_pcb.pcb_cr3 = IdlePTD; 1358} 1359 1360/* 1361 * The registers are in the frame; the frame is in the user area of 1362 * the process in question; when the process is active, the registers 1363 * are in "the kernel stack"; when it's not, they're still there, but 1364 * things get flipped around. So, since p->p_md.md_regs is the whole address 1365 * of the register set, take its offset from the kernel stack, and 1366 * index into the user block. Don't you just *love* virtual memory? 1367 * (I'm starting to think seymour is right...) 1368 */ 1369#define TF_REGP(p) ((struct trapframe *)(p)->p_md.md_regs) 1370 1371int 1372ptrace_set_pc(p, addr) 1373 struct proc *p; 1374 unsigned int addr; 1375{ 1376 TF_REGP(p)->tf_eip = addr; 1377 return (0); 1378} 1379 1380int 1381ptrace_single_step(p) 1382 struct proc *p; 1383{ 1384 TF_REGP(p)->tf_eflags |= PSL_T; 1385 return (0); 1386} 1387 1388int ptrace_write_u(p, off, data) 1389 struct proc *p; 1390 vm_offset_t off; 1391 int data; 1392{ 1393 struct trapframe frame_copy; 1394 vm_offset_t min; 1395 struct trapframe *tp; 1396 1397 /* 1398 * Privileged kernel state is scattered all over the user area. 1399 * Only allow write access to parts of regs and to fpregs. 1400 */ 1401 min = (char *)p->p_md.md_regs - (char *)p->p_addr; 1402 if (off >= min && off <= min + sizeof(struct trapframe) - sizeof(int)) { 1403 tp = TF_REGP(p); 1404 frame_copy = *tp; 1405 *(int *)((char *)&frame_copy + (off - min)) = data; 1406 if (!EFLAGS_SECURE(frame_copy.tf_eflags, tp->tf_eflags) || 1407 !CS_SECURE(frame_copy.tf_cs)) 1408 return (EINVAL); 1409 *(int*)((char *)p->p_addr + off) = data; 1410 return (0); 1411 } 1412 min = offsetof(struct user, u_pcb) + offsetof(struct pcb, pcb_savefpu); 1413 if (off >= min && off <= min + sizeof(struct save87) - sizeof(int)) { 1414 *(int*)((char *)p->p_addr + off) = data; 1415 return (0); 1416 } 1417 return (EFAULT); 1418} 1419 1420int 1421fill_regs(p, regs) 1422 struct proc *p; 1423 struct reg *regs; 1424{ 1425 struct trapframe *tp; 1426 1427 tp = TF_REGP(p); 1428 regs->r_es = tp->tf_es; 1429 regs->r_ds = tp->tf_ds; 1430 regs->r_edi = tp->tf_edi; 1431 regs->r_esi = tp->tf_esi; 1432 regs->r_ebp = tp->tf_ebp; 1433 regs->r_ebx = tp->tf_ebx; 1434 regs->r_edx = tp->tf_edx; 1435 regs->r_ecx = tp->tf_ecx; 1436 regs->r_eax = tp->tf_eax; 1437 regs->r_eip = tp->tf_eip; 1438 regs->r_cs = tp->tf_cs; 1439 regs->r_eflags = tp->tf_eflags; 1440 regs->r_esp = tp->tf_esp; 1441 regs->r_ss = tp->tf_ss; 1442 return (0); 1443} 1444 1445int 1446set_regs(p, regs) 1447 struct proc *p; 1448 struct reg *regs; 1449{ 1450 struct trapframe *tp; 1451 1452 tp = TF_REGP(p); 1453 if (!EFLAGS_SECURE(regs->r_eflags, tp->tf_eflags) || 1454 !CS_SECURE(regs->r_cs)) 1455 return (EINVAL); 1456 tp->tf_es = regs->r_es; 1457 tp->tf_ds = regs->r_ds; 1458 tp->tf_edi = regs->r_edi; 1459 tp->tf_esi = regs->r_esi; 1460 tp->tf_ebp = regs->r_ebp; 1461 tp->tf_ebx = regs->r_ebx; 1462 tp->tf_edx = regs->r_edx; 1463 tp->tf_ecx = regs->r_ecx; 1464 tp->tf_eax = regs->r_eax; 1465 tp->tf_eip = regs->r_eip; 1466 tp->tf_cs = regs->r_cs; 1467 tp->tf_eflags = regs->r_eflags; 1468 tp->tf_esp = regs->r_esp; 1469 tp->tf_ss = regs->r_ss; 1470 return (0); 1471} 1472 1473#ifndef DDB 1474void 1475Debugger(const char *msg) 1476{ 1477 printf("Debugger(\"%s\") called.\n", msg); 1478} 1479#endif /* no DDB */ 1480 1481#include <sys/disklabel.h> 1482 1483/* 1484 * Determine the size of the transfer, and make sure it is 1485 * within the boundaries of the partition. Adjust transfer 1486 * if needed, and signal errors or early completion. 1487 */ 1488int 1489bounds_check_with_label(struct buf *bp, struct disklabel *lp, int wlabel) 1490{ 1491 struct partition *p = lp->d_partitions + dkpart(bp->b_dev); 1492 int labelsect = lp->d_partitions[0].p_offset; 1493 int maxsz = p->p_size, 1494 sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT; 1495 1496 /* overwriting disk label ? */ 1497 /* XXX should also protect bootstrap in first 8K */ 1498 if (bp->b_blkno + p->p_offset <= LABELSECTOR + labelsect && 1499#if LABELSECTOR != 0 1500 bp->b_blkno + p->p_offset + sz > LABELSECTOR + labelsect && 1501#endif 1502 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 1503 bp->b_error = EROFS; 1504 goto bad; 1505 } 1506 1507#if defined(DOSBBSECTOR) && defined(notyet) 1508 /* overwriting master boot record? */ 1509 if (bp->b_blkno + p->p_offset <= DOSBBSECTOR && 1510 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 1511 bp->b_error = EROFS; 1512 goto bad; 1513 } 1514#endif 1515 1516 /* beyond partition? */ 1517 if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz) { 1518 /* if exactly at end of disk, return an EOF */ 1519 if (bp->b_blkno == maxsz) { 1520 bp->b_resid = bp->b_bcount; 1521 return(0); 1522 } 1523 /* or truncate if part of it fits */ 1524 sz = maxsz - bp->b_blkno; 1525 if (sz <= 0) { 1526 bp->b_error = EINVAL; 1527 goto bad; 1528 } 1529 bp->b_bcount = sz << DEV_BSHIFT; 1530 } 1531 1532 bp->b_pblkno = bp->b_blkno + p->p_offset; 1533 return(1); 1534 1535bad: 1536 bp->b_flags |= B_ERROR; 1537 return(-1); 1538} 1539 1540#ifdef DDB 1541 1542/* 1543 * Provide inb() and outb() as functions. They are normally only 1544 * available as macros calling inlined functions, thus cannot be 1545 * called inside DDB. 1546 * 1547 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined. 1548 */ 1549 1550#undef inb 1551#undef outb 1552 1553/* silence compiler warnings */ 1554u_char inb(u_int); 1555void outb(u_int, u_char); 1556 1557u_char 1558inb(u_int port) 1559{ 1560 u_char data; 1561 /* 1562 * We use %%dx and not %1 here because i/o is done at %dx and not at 1563 * %edx, while gcc generates inferior code (movw instead of movl) 1564 * if we tell it to load (u_short) port. 1565 */ 1566 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 1567 return (data); 1568} 1569 1570void 1571outb(u_int port, u_char data) 1572{ 1573 u_char al; 1574 /* 1575 * Use an unnecessary assignment to help gcc's register allocator. 1576 * This make a large difference for gcc-1.40 and a tiny difference 1577 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for 1578 * best results. gcc-2.6.0 can't handle this. 1579 */ 1580 al = data; 1581 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 1582} 1583 1584#endif /* DDB */ 1585