machdep.c revision 24691
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 1.235 1997/04/07 06:45:13 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 } 304 v = (caddr_t)((vm_offset_t)round_page(v)); 305 valloc(bouncememory, char, bouncepages * PAGE_SIZE); 306 } 307#endif 308 309 /* 310 * End of first pass, size has been calculated so allocate memory 311 */ 312 if (firstaddr == 0) { 313 size = (vm_size_t)(v - firstaddr); 314 firstaddr = (int)kmem_alloc(kernel_map, round_page(size)); 315 if (firstaddr == 0) 316 panic("startup: no room for tables"); 317 goto again; 318 } 319 320 /* 321 * End of second pass, addresses have been assigned 322 */ 323 if ((vm_size_t)(v - firstaddr) != size) 324 panic("startup: table size inconsistency"); 325 326#ifdef BOUNCE_BUFFERS 327 clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva, 328 (nbuf*BKVASIZE) + (nswbuf*MAXPHYS) + 329 maxbkva + pager_map_size, TRUE); 330 io_map = kmem_suballoc(clean_map, &minaddr, &maxaddr, maxbkva, FALSE); 331#else 332 clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva, 333 (nbuf*BKVASIZE) + (nswbuf*MAXPHYS) + pager_map_size, TRUE); 334#endif 335 buffer_map = kmem_suballoc(clean_map, &buffer_sva, &buffer_eva, 336 (nbuf*BKVASIZE), TRUE); 337 pager_map = kmem_suballoc(clean_map, &pager_sva, &pager_eva, 338 (nswbuf*MAXPHYS) + pager_map_size, TRUE); 339 exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, 340 (16*ARG_MAX), TRUE); 341 u_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, 342 (maxproc*UPAGES*PAGE_SIZE), FALSE); 343 344 /* 345 * Finally, allocate mbuf pool. Since mclrefcnt is an off-size 346 * we use the more space efficient malloc in place of kmem_alloc. 347 */ 348 { 349 vm_offset_t mb_map_size; 350 351 mb_map_size = nmbufs * MSIZE + nmbclusters * MCLBYTES; 352 mb_map_size = roundup2(mb_map_size, max(MCLBYTES, PAGE_SIZE)); 353 mclrefcnt = malloc(mb_map_size / MCLBYTES, M_MBUF, M_NOWAIT); 354 bzero(mclrefcnt, mb_map_size / MCLBYTES); 355 mb_map = kmem_suballoc(kmem_map, (vm_offset_t *)&mbutl, &maxaddr, 356 mb_map_size, FALSE); 357 } 358 359 /* 360 * Initialize callouts 361 */ 362 callfree = callout; 363 for (i = 1; i < ncallout; i++) 364 callout[i-1].c_next = &callout[i]; 365 366#if defined(USERCONFIG) 367#if defined(USERCONFIG_BOOT) 368 if (1) { 369#else 370 if (boothowto & RB_CONFIG) { 371#endif 372 userconfig(); 373 cninit(); /* the preferred console may have changed */ 374 } 375#endif 376 377#ifdef BOUNCE_BUFFERS 378 /* 379 * init bounce buffers 380 */ 381 vm_bounce_init(); 382#endif 383 384 printf("avail memory = %d (%dK bytes)\n", ptoa(cnt.v_free_count), 385 ptoa(cnt.v_free_count) / 1024); 386 387 /* 388 * Set up buffers, so they can be used to read disk labels. 389 */ 390 bufinit(); 391 vm_pager_bufferinit(); 392} 393 394int 395register_netisr(num, handler) 396 int num; 397 netisr_t *handler; 398{ 399 400 if (num < 0 || num >= (sizeof(netisrs)/sizeof(*netisrs)) ) { 401 printf("register_netisr: bad isr number: %d\n", num); 402 return (EINVAL); 403 } 404 netisrs[num] = handler; 405 return (0); 406} 407 408static void 409setup_netisrs(ls) 410 struct linker_set *ls; 411{ 412 int i; 413 const struct netisrtab *nit; 414 415 for(i = 0; ls->ls_items[i]; i++) { 416 nit = (const struct netisrtab *)ls->ls_items[i]; 417 register_netisr(nit->nit_num, nit->nit_isr); 418 } 419} 420 421/* 422 * Send an interrupt to process. 423 * 424 * Stack is set up to allow sigcode stored 425 * at top to call routine, followed by kcall 426 * to sigreturn routine below. After sigreturn 427 * resets the signal mask, the stack, and the 428 * frame pointer, it returns to the user 429 * specified pc, psl. 430 */ 431void 432sendsig(catcher, sig, mask, code) 433 sig_t catcher; 434 int sig, mask; 435 u_long code; 436{ 437 register struct proc *p = curproc; 438 register int *regs; 439 register struct sigframe *fp; 440 struct sigframe sf; 441 struct sigacts *psp = p->p_sigacts; 442 int oonstack; 443 444 regs = p->p_md.md_regs; 445 oonstack = psp->ps_sigstk.ss_flags & SS_ONSTACK; 446 /* 447 * Allocate and validate space for the signal handler context. 448 */ 449 if ((psp->ps_flags & SAS_ALTSTACK) && !oonstack && 450 (psp->ps_sigonstack & sigmask(sig))) { 451 fp = (struct sigframe *)(psp->ps_sigstk.ss_sp + 452 psp->ps_sigstk.ss_size - sizeof(struct sigframe)); 453 psp->ps_sigstk.ss_flags |= SS_ONSTACK; 454 } else { 455 fp = (struct sigframe *)regs[tESP] - 1; 456 } 457 458 /* 459 * grow() will return FALSE if the fp will not fit inside the stack 460 * and the stack can not be grown. useracc will return FALSE 461 * if access is denied. 462 */ 463 if ((grow(p, (int)fp) == FALSE) || 464 (useracc((caddr_t)fp, sizeof (struct sigframe), B_WRITE) == FALSE)) { 465 /* 466 * Process has trashed its stack; give it an illegal 467 * instruction to halt it in its tracks. 468 */ 469 SIGACTION(p, SIGILL) = SIG_DFL; 470 sig = sigmask(SIGILL); 471 p->p_sigignore &= ~sig; 472 p->p_sigcatch &= ~sig; 473 p->p_sigmask &= ~sig; 474 psignal(p, SIGILL); 475 return; 476 } 477 478 /* 479 * Build the argument list for the signal handler. 480 */ 481 if (p->p_sysent->sv_sigtbl) { 482 if (sig < p->p_sysent->sv_sigsize) 483 sig = p->p_sysent->sv_sigtbl[sig]; 484 else 485 sig = p->p_sysent->sv_sigsize + 1; 486 } 487 sf.sf_signum = sig; 488 sf.sf_code = code; 489 sf.sf_scp = &fp->sf_sc; 490 sf.sf_addr = (char *) regs[tERR]; 491 sf.sf_handler = catcher; 492 493 /* save scratch registers */ 494 sf.sf_sc.sc_eax = regs[tEAX]; 495 sf.sf_sc.sc_ebx = regs[tEBX]; 496 sf.sf_sc.sc_ecx = regs[tECX]; 497 sf.sf_sc.sc_edx = regs[tEDX]; 498 sf.sf_sc.sc_esi = regs[tESI]; 499 sf.sf_sc.sc_edi = regs[tEDI]; 500 sf.sf_sc.sc_cs = regs[tCS]; 501 sf.sf_sc.sc_ds = regs[tDS]; 502 sf.sf_sc.sc_ss = regs[tSS]; 503 sf.sf_sc.sc_es = regs[tES]; 504 sf.sf_sc.sc_isp = regs[tISP]; 505 506 /* 507 * Build the signal context to be used by sigreturn. 508 */ 509 sf.sf_sc.sc_onstack = oonstack; 510 sf.sf_sc.sc_mask = mask; 511 sf.sf_sc.sc_sp = regs[tESP]; 512 sf.sf_sc.sc_fp = regs[tEBP]; 513 sf.sf_sc.sc_pc = regs[tEIP]; 514 sf.sf_sc.sc_ps = regs[tEFLAGS]; 515 516 /* 517 * Copy the sigframe out to the user's stack. 518 */ 519 if (copyout(&sf, fp, sizeof(struct sigframe)) != 0) { 520 /* 521 * Something is wrong with the stack pointer. 522 * ...Kill the process. 523 */ 524 sigexit(p, SIGILL); 525 }; 526 527 regs[tESP] = (int)fp; 528 regs[tEIP] = (int)(((char *)PS_STRINGS) - *(p->p_sysent->sv_szsigcode)); 529 regs[tEFLAGS] &= ~PSL_VM; 530 regs[tCS] = _ucodesel; 531 regs[tDS] = _udatasel; 532 regs[tES] = _udatasel; 533 regs[tSS] = _udatasel; 534} 535 536/* 537 * System call to cleanup state after a signal 538 * has been taken. Reset signal mask and 539 * stack state from context left by sendsig (above). 540 * Return to previous pc and psl as specified by 541 * context left by sendsig. Check carefully to 542 * make sure that the user has not modified the 543 * state to gain improper privileges. 544 */ 545int 546sigreturn(p, uap, retval) 547 struct proc *p; 548 struct sigreturn_args /* { 549 struct sigcontext *sigcntxp; 550 } */ *uap; 551 int *retval; 552{ 553 register struct sigcontext *scp; 554 register struct sigframe *fp; 555 register int *regs = p->p_md.md_regs; 556 int eflags; 557 558 /* 559 * (XXX old comment) regs[tESP] points to the return address. 560 * The user scp pointer is above that. 561 * The return address is faked in the signal trampoline code 562 * for consistency. 563 */ 564 scp = uap->sigcntxp; 565 fp = (struct sigframe *) 566 ((caddr_t)scp - offsetof(struct sigframe, sf_sc)); 567 568 if (useracc((caddr_t)fp, sizeof (*fp), B_WRITE) == 0) 569 return(EFAULT); 570 571 /* 572 * Don't allow users to change privileged or reserved flags. 573 */ 574#define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 575 eflags = scp->sc_ps; 576 /* 577 * XXX do allow users to change the privileged flag PSL_RF. The 578 * cpu sets PSL_RF in tf_eflags for faults. Debuggers should 579 * sometimes set it there too. tf_eflags is kept in the signal 580 * context during signal handling and there is no other place 581 * to remember it, so the PSL_RF bit may be corrupted by the 582 * signal handler without us knowing. Corruption of the PSL_RF 583 * bit at worst causes one more or one less debugger trap, so 584 * allowing it is fairly harmless. 585 */ 586 if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs[tEFLAGS] & ~PSL_RF)) { 587#ifdef DEBUG 588 printf("sigreturn: eflags = 0x%x\n", eflags); 589#endif 590 return(EINVAL); 591 } 592 593 /* 594 * Don't allow users to load a valid privileged %cs. Let the 595 * hardware check for invalid selectors, excess privilege in 596 * other selectors, invalid %eip's and invalid %esp's. 597 */ 598#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 599 if (!CS_SECURE(scp->sc_cs)) { 600#ifdef DEBUG 601 printf("sigreturn: cs = 0x%x\n", scp->sc_cs); 602#endif 603 trapsignal(p, SIGBUS, T_PROTFLT); 604 return(EINVAL); 605 } 606 607 /* restore scratch registers */ 608 regs[tEAX] = scp->sc_eax; 609 regs[tEBX] = scp->sc_ebx; 610 regs[tECX] = scp->sc_ecx; 611 regs[tEDX] = scp->sc_edx; 612 regs[tESI] = scp->sc_esi; 613 regs[tEDI] = scp->sc_edi; 614 regs[tCS] = scp->sc_cs; 615 regs[tDS] = scp->sc_ds; 616 regs[tES] = scp->sc_es; 617 regs[tSS] = scp->sc_ss; 618 regs[tISP] = scp->sc_isp; 619 620 if (useracc((caddr_t)scp, sizeof (*scp), B_WRITE) == 0) 621 return(EINVAL); 622 623 if (scp->sc_onstack & 01) 624 p->p_sigacts->ps_sigstk.ss_flags |= SS_ONSTACK; 625 else 626 p->p_sigacts->ps_sigstk.ss_flags &= ~SS_ONSTACK; 627 p->p_sigmask = scp->sc_mask & ~sigcantmask; 628 regs[tEBP] = scp->sc_fp; 629 regs[tESP] = scp->sc_sp; 630 regs[tEIP] = scp->sc_pc; 631 regs[tEFLAGS] = eflags; 632 return(EJUSTRETURN); 633} 634 635/* 636 * Machine dependent boot() routine 637 * 638 * I haven't seen anything to put here yet 639 * Possibly some stuff might be grafted back here from boot() 640 */ 641void 642cpu_boot(int howto) 643{ 644} 645 646/* 647 * Shutdown the CPU as much as possible 648 */ 649void 650cpu_halt(void) 651{ 652 for (;;) 653 __asm__ ("hlt"); 654} 655 656/* 657 * Clear registers on exec 658 */ 659void 660setregs(p, entry, stack) 661 struct proc *p; 662 u_long entry; 663 u_long stack; 664{ 665 int *regs = p->p_md.md_regs; 666 667#ifdef USER_LDT 668 struct pcb *pcb = &p->p_addr->u_pcb; 669 670 /* was i386_user_cleanup() in NetBSD */ 671 if (pcb->pcb_ldt) { 672 if (pcb == curpcb) 673 lldt(GSEL(GUSERLDT_SEL, SEL_KPL)); 674 kmem_free(kernel_map, (vm_offset_t)pcb->pcb_ldt, 675 pcb->pcb_ldt_len * sizeof(union descriptor)); 676 pcb->pcb_ldt_len = (int)pcb->pcb_ldt = 0; 677 } 678#endif 679 680 bzero(regs, sizeof(struct trapframe)); 681 regs[tEIP] = entry; 682 regs[tESP] = stack; 683 regs[tEFLAGS] = PSL_USER | (regs[tEFLAGS] & PSL_T); 684 regs[tSS] = _udatasel; 685 regs[tDS] = _udatasel; 686 regs[tES] = _udatasel; 687 regs[tCS] = _ucodesel; 688 689 /* 690 * Initialize the math emulator (if any) for the current process. 691 * Actually, just clear the bit that says that the emulator has 692 * been initialized. Initialization is delayed until the process 693 * traps to the emulator (if it is done at all) mainly because 694 * emulators don't provide an entry point for initialization. 695 */ 696 p->p_addr->u_pcb.pcb_flags &= ~FP_SOFTFP; 697 698 /* 699 * Arrange to trap the next npx or `fwait' instruction (see npx.c 700 * for why fwait must be trapped at least if there is an npx or an 701 * emulator). This is mainly to handle the case where npx0 is not 702 * configured, since the npx routines normally set up the trap 703 * otherwise. It should be done only at boot time, but doing it 704 * here allows modifying `npx_exists' for testing the emulator on 705 * systems with an npx. 706 */ 707 load_cr0(rcr0() | CR0_MP | CR0_TS); 708 709#if NNPX > 0 710 /* Initialize the npx (if any) for the current process. */ 711 npxinit(__INITIAL_NPXCW__); 712#endif 713} 714 715static int 716sysctl_machdep_adjkerntz SYSCTL_HANDLER_ARGS 717{ 718 int error; 719 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 720 req); 721 if (!error && req->newptr) 722 resettodr(); 723 return (error); 724} 725 726SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 727 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 728 729SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, 730 CTLFLAG_RW, &disable_rtc_set, 0, ""); 731 732SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo, 733 CTLFLAG_RD, &bootinfo, bootinfo, ""); 734 735SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock, 736 CTLFLAG_RW, &wall_cmos_clock, 0, ""); 737 738/* 739 * Initialize 386 and configure to run kernel 740 */ 741 742/* 743 * Initialize segments & interrupt table 744 */ 745 746int currentldt; 747int _default_ldt; 748union descriptor gdt[NGDT]; /* global descriptor table */ 749struct gate_descriptor idt[NIDT]; /* interrupt descriptor table */ 750union descriptor ldt[NLDT]; /* local descriptor table */ 751struct i386tss common_tss; 752 753static struct i386tss dblfault_tss; 754static char dblfault_stack[PAGE_SIZE]; 755 756extern struct user *proc0paddr; 757 758#ifdef TSS_IS_CACHED /* cpu_switch helper */ 759struct segment_descriptor *tssptr; 760int gsel_tss; 761#endif 762 763/* software prototypes -- in more palatable form */ 764struct soft_segment_descriptor gdt_segs[] = { 765/* GNULL_SEL 0 Null Descriptor */ 766{ 0x0, /* segment base address */ 767 0x0, /* length */ 768 0, /* segment type */ 769 0, /* segment descriptor priority level */ 770 0, /* segment descriptor present */ 771 0, 0, 772 0, /* default 32 vs 16 bit size */ 773 0 /* limit granularity (byte/page units)*/ }, 774/* GCODE_SEL 1 Code Descriptor for kernel */ 775{ 0x0, /* segment base address */ 776 0xfffff, /* length - all address space */ 777 SDT_MEMERA, /* segment type */ 778 0, /* segment descriptor priority level */ 779 1, /* segment descriptor present */ 780 0, 0, 781 1, /* default 32 vs 16 bit size */ 782 1 /* limit granularity (byte/page units)*/ }, 783/* GDATA_SEL 2 Data Descriptor for kernel */ 784{ 0x0, /* segment base address */ 785 0xfffff, /* length - all address space */ 786 SDT_MEMRWA, /* segment type */ 787 0, /* segment descriptor priority level */ 788 1, /* segment descriptor present */ 789 0, 0, 790 1, /* default 32 vs 16 bit size */ 791 1 /* limit granularity (byte/page units)*/ }, 792/* GLDT_SEL 3 LDT Descriptor */ 793{ (int) ldt, /* segment base address */ 794 sizeof(ldt)-1, /* length - all address space */ 795 SDT_SYSLDT, /* segment type */ 796 SEL_UPL, /* segment descriptor priority level */ 797 1, /* segment descriptor present */ 798 0, 0, 799 0, /* unused - default 32 vs 16 bit size */ 800 0 /* limit granularity (byte/page units)*/ }, 801/* GTGATE_SEL 4 Null Descriptor - Placeholder */ 802{ 0x0, /* segment base address */ 803 0x0, /* length - all address space */ 804 0, /* segment type */ 805 0, /* segment descriptor priority level */ 806 0, /* segment descriptor present */ 807 0, 0, 808 0, /* default 32 vs 16 bit size */ 809 0 /* limit granularity (byte/page units)*/ }, 810/* GPANIC_SEL 5 Panic Tss Descriptor */ 811{ (int) &dblfault_tss, /* segment base address */ 812 sizeof(struct i386tss)-1,/* length - all address space */ 813 SDT_SYS386TSS, /* segment type */ 814 0, /* segment descriptor priority level */ 815 1, /* segment descriptor present */ 816 0, 0, 817 0, /* unused - default 32 vs 16 bit size */ 818 0 /* limit granularity (byte/page units)*/ }, 819/* GPROC0_SEL 6 Proc 0 Tss Descriptor */ 820{ (int) &common_tss, /* segment base address */ 821 sizeof(struct i386tss)-1,/* length - all address space */ 822 SDT_SYS386TSS, /* segment type */ 823 0, /* segment descriptor priority level */ 824 1, /* segment descriptor present */ 825 0, 0, 826 0, /* unused - default 32 vs 16 bit size */ 827 0 /* limit granularity (byte/page units)*/ }, 828/* GUSERLDT_SEL 7 User LDT Descriptor per process */ 829{ (int) ldt, /* segment base address */ 830 (512 * sizeof(union descriptor)-1), /* length */ 831 SDT_SYSLDT, /* segment type */ 832 0, /* segment descriptor priority level */ 833 1, /* segment descriptor present */ 834 0, 0, 835 0, /* unused - default 32 vs 16 bit size */ 836 0 /* limit granularity (byte/page units)*/ }, 837/* GAPMCODE32_SEL 8 APM BIOS 32-bit interface (32bit Code) */ 838{ 0, /* segment base address (overwritten by APM) */ 839 0xfffff, /* length */ 840 SDT_MEMERA, /* segment type */ 841 0, /* segment descriptor priority level */ 842 1, /* segment descriptor present */ 843 0, 0, 844 1, /* default 32 vs 16 bit size */ 845 1 /* limit granularity (byte/page units)*/ }, 846/* GAPMCODE16_SEL 9 APM BIOS 32-bit interface (16bit Code) */ 847{ 0, /* segment base address (overwritten by APM) */ 848 0xfffff, /* length */ 849 SDT_MEMERA, /* segment type */ 850 0, /* segment descriptor priority level */ 851 1, /* segment descriptor present */ 852 0, 0, 853 0, /* default 32 vs 16 bit size */ 854 1 /* limit granularity (byte/page units)*/ }, 855/* GAPMDATA_SEL 10 APM BIOS 32-bit interface (Data) */ 856{ 0, /* segment base address (overwritten by APM) */ 857 0xfffff, /* length */ 858 SDT_MEMRWA, /* segment type */ 859 0, /* segment descriptor priority level */ 860 1, /* segment descriptor present */ 861 0, 0, 862 1, /* default 32 vs 16 bit size */ 863 1 /* limit granularity (byte/page units)*/ }, 864}; 865 866static struct soft_segment_descriptor ldt_segs[] = { 867 /* Null Descriptor - overwritten by call gate */ 868{ 0x0, /* segment base address */ 869 0x0, /* length - all address space */ 870 0, /* segment type */ 871 0, /* segment descriptor priority level */ 872 0, /* segment descriptor present */ 873 0, 0, 874 0, /* default 32 vs 16 bit size */ 875 0 /* limit granularity (byte/page units)*/ }, 876 /* Null Descriptor - overwritten by call gate */ 877{ 0x0, /* segment base address */ 878 0x0, /* length - all address space */ 879 0, /* segment type */ 880 0, /* segment descriptor priority level */ 881 0, /* segment descriptor present */ 882 0, 0, 883 0, /* default 32 vs 16 bit size */ 884 0 /* limit granularity (byte/page units)*/ }, 885 /* Null Descriptor - overwritten by call gate */ 886{ 0x0, /* segment base address */ 887 0x0, /* length - all address space */ 888 0, /* segment type */ 889 0, /* segment descriptor priority level */ 890 0, /* segment descriptor present */ 891 0, 0, 892 0, /* default 32 vs 16 bit size */ 893 0 /* limit granularity (byte/page units)*/ }, 894 /* Code Descriptor for user */ 895{ 0x0, /* segment base address */ 896 0xfffff, /* length - all address space */ 897 SDT_MEMERA, /* segment type */ 898 SEL_UPL, /* segment descriptor priority level */ 899 1, /* segment descriptor present */ 900 0, 0, 901 1, /* default 32 vs 16 bit size */ 902 1 /* limit granularity (byte/page units)*/ }, 903 /* Data Descriptor for user */ 904{ 0x0, /* segment base address */ 905 0xfffff, /* length - all address space */ 906 SDT_MEMRWA, /* segment type */ 907 SEL_UPL, /* segment descriptor priority level */ 908 1, /* segment descriptor present */ 909 0, 0, 910 1, /* default 32 vs 16 bit size */ 911 1 /* limit granularity (byte/page units)*/ }, 912}; 913 914void 915setidt(idx, func, typ, dpl, selec) 916 int idx; 917 inthand_t *func; 918 int typ; 919 int dpl; 920 int selec; 921{ 922 struct gate_descriptor *ip = idt + idx; 923 924 ip->gd_looffset = (int)func; 925 ip->gd_selector = selec; 926 ip->gd_stkcpy = 0; 927 ip->gd_xx = 0; 928 ip->gd_type = typ; 929 ip->gd_dpl = dpl; 930 ip->gd_p = 1; 931 ip->gd_hioffset = ((int)func)>>16 ; 932} 933 934#define IDTVEC(name) __CONCAT(X,name) 935 936extern inthand_t 937 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 938 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 939 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 940 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 941 IDTVEC(syscall), IDTVEC(int0x80_syscall); 942 943void 944sdtossd(sd, ssd) 945 struct segment_descriptor *sd; 946 struct soft_segment_descriptor *ssd; 947{ 948 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 949 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 950 ssd->ssd_type = sd->sd_type; 951 ssd->ssd_dpl = sd->sd_dpl; 952 ssd->ssd_p = sd->sd_p; 953 ssd->ssd_def32 = sd->sd_def32; 954 ssd->ssd_gran = sd->sd_gran; 955} 956 957void 958init386(first) 959 int first; 960{ 961 int x; 962 unsigned biosbasemem, biosextmem; 963 struct gate_descriptor *gdp; 964#ifndef TSS_IS_CACHED 965 int gsel_tss; 966#endif 967 struct isa_device *idp; 968 /* table descriptors - used to load tables by microp */ 969 struct region_descriptor r_gdt, r_idt; 970 int pagesinbase, pagesinext; 971 int target_page, pa_indx; 972 int off; 973 974 proc0.p_addr = proc0paddr; 975 976 atdevbase = ISA_HOLE_START + KERNBASE; 977 978 /* 979 * Initialize the console before we print anything out. 980 */ 981 cninit(); 982 983 /* 984 * make gdt memory segments, the code segment goes up to end of the 985 * page with etext in it, the data segment goes to the end of 986 * the address space 987 */ 988 /* 989 * XXX text protection is temporarily (?) disabled. The limit was 990 * i386_btop(round_page(etext)) - 1. 991 */ 992 gdt_segs[GCODE_SEL].ssd_limit = i386_btop(0) - 1; 993 gdt_segs[GDATA_SEL].ssd_limit = i386_btop(0) - 1; 994 for (x = 0; x < NGDT; x++) 995 ssdtosd(&gdt_segs[x], &gdt[x].sd); 996 997 /* make ldt memory segments */ 998 /* 999 * The data segment limit must not cover the user area because we 1000 * don't want the user area to be writable in copyout() etc. (page 1001 * level protection is lost in kernel mode on 386's). Also, we 1002 * don't want the user area to be writable directly (page level 1003 * protection of the user area is not available on 486's with 1004 * CR0_WP set, because there is no user-read/kernel-write mode). 1005 * 1006 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it 1007 * should be spelled ...MAX_USER... 1008 */ 1009#define VM_END_USER_RW_ADDRESS VM_MAXUSER_ADDRESS 1010 /* 1011 * The code segment limit has to cover the user area until we move 1012 * the signal trampoline out of the user area. This is safe because 1013 * the code segment cannot be written to directly. 1014 */ 1015#define VM_END_USER_R_ADDRESS (VM_END_USER_RW_ADDRESS + UPAGES * PAGE_SIZE) 1016 ldt_segs[LUCODE_SEL].ssd_limit = i386_btop(VM_END_USER_R_ADDRESS) - 1; 1017 ldt_segs[LUDATA_SEL].ssd_limit = i386_btop(VM_END_USER_RW_ADDRESS) - 1; 1018 /* Note. eventually want private ldts per process */ 1019 for (x = 0; x < NLDT; x++) 1020 ssdtosd(&ldt_segs[x], &ldt[x].sd); 1021 1022 /* exceptions */ 1023 for (x = 0; x < NIDT; x++) 1024 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1025 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1026 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1027 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1028 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1029 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1030 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1031 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1032 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1033 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL)); 1034 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1035 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1036 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1037 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1038 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1039 setidt(14, &IDTVEC(page), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1040 setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1041 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1042 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1043 setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1044 setidt(0x80, &IDTVEC(int0x80_syscall), 1045 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1046 1047#include "isa.h" 1048#if NISA >0 1049 isa_defaultirq(); 1050#endif 1051 rand_initialize(); 1052 1053 r_gdt.rd_limit = sizeof(gdt) - 1; 1054 r_gdt.rd_base = (int) gdt; 1055 lgdt(&r_gdt); 1056 1057 r_idt.rd_limit = sizeof(idt) - 1; 1058 r_idt.rd_base = (int) idt; 1059 lidt(&r_idt); 1060 1061 _default_ldt = GSEL(GLDT_SEL, SEL_KPL); 1062 lldt(_default_ldt); 1063 currentldt = _default_ldt; 1064 1065#ifdef DDB 1066 kdb_init(); 1067 if (boothowto & RB_KDB) 1068 Debugger("Boot flags requested debugger"); 1069#endif 1070 1071 finishidentcpu(); /* Final stage of CPU initialization */ 1072 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1073 initializecpu(); /* Initialize CPU registers */ 1074 1075 /* Use BIOS values stored in RTC CMOS RAM, since probing 1076 * breaks certain 386 AT relics. 1077 */ 1078 biosbasemem = rtcin(RTC_BASELO)+ (rtcin(RTC_BASEHI)<<8); 1079 biosextmem = rtcin(RTC_EXTLO)+ (rtcin(RTC_EXTHI)<<8); 1080 1081 /* 1082 * If BIOS tells us that it has more than 640k in the basemem, 1083 * don't believe it - set it to 640k. 1084 */ 1085 if (biosbasemem > 640) { 1086 printf("Preposterous RTC basemem of %dK, truncating to 640K\n", 1087 biosbasemem); 1088 biosbasemem = 640; 1089 } 1090 if (bootinfo.bi_memsizes_valid && bootinfo.bi_basemem > 640) { 1091 printf("Preposterous BIOS basemem of %dK, truncating to 640K\n", 1092 bootinfo.bi_basemem); 1093 bootinfo.bi_basemem = 640; 1094 } 1095 1096 /* 1097 * Warn if the official BIOS interface disagrees with the RTC 1098 * interface used above about the amount of base memory or the 1099 * amount of extended memory. Prefer the BIOS value for the base 1100 * memory. This is necessary for machines that `steal' base 1101 * memory for use as BIOS memory, at least if we are going to use 1102 * the BIOS for apm. Prefer the RTC value for extended memory. 1103 * Eventually the hackish interface shouldn't even be looked at. 1104 */ 1105 if (bootinfo.bi_memsizes_valid) { 1106 if (bootinfo.bi_basemem != biosbasemem) { 1107 vm_offset_t pa; 1108 1109 printf( 1110 "BIOS basemem (%ldK) != RTC basemem (%dK), setting to BIOS value\n", 1111 bootinfo.bi_basemem, biosbasemem); 1112 biosbasemem = bootinfo.bi_basemem; 1113 1114 /* 1115 * XXX if biosbasemem is now < 640, there is `hole' 1116 * between the end of base memory and the start of 1117 * ISA memory. The hole may be empty or it may 1118 * contain BIOS code or data. Map it read/write so 1119 * that the BIOS can write to it. (Memory from 0 to 1120 * the physical end of the kernel is mapped read-only 1121 * to begin with and then parts of it are remapped. 1122 * The parts that aren't remapped form holes that 1123 * remain read-only and are unused by the kernel. 1124 * The base memory area is below the physical end of 1125 * the kernel and right now forms a read-only hole. 1126 * The part of it from 0 to 1127 * (trunc_page(biosbasemem * 1024) - 1) will be 1128 * remapped and used by the kernel later.) 1129 * 1130 * This code is similar to the code used in 1131 * pmap_mapdev, but since no memory needs to be 1132 * allocated we simply change the mapping. 1133 */ 1134 for (pa = trunc_page(biosbasemem * 1024); 1135 pa < ISA_HOLE_START; pa += PAGE_SIZE) { 1136 unsigned *pte; 1137 1138 pte = (unsigned *)vtopte(pa + KERNBASE); 1139 *pte = pa | PG_RW | PG_V; 1140 } 1141 } 1142 if (bootinfo.bi_extmem != biosextmem) 1143 printf("BIOS extmem (%ldK) != RTC extmem (%dK)\n", 1144 bootinfo.bi_extmem, biosextmem); 1145 } 1146 1147 pagesinbase = biosbasemem * 1024 / PAGE_SIZE; 1148 pagesinext = biosextmem * 1024 / PAGE_SIZE; 1149 1150 /* 1151 * Special hack for chipsets that still remap the 384k hole when 1152 * there's 16MB of memory - this really confuses people that 1153 * are trying to use bus mastering ISA controllers with the 1154 * "16MB limit"; they only have 16MB, but the remapping puts 1155 * them beyond the limit. 1156 */ 1157 /* 1158 * If extended memory is between 15-16MB (16-17MB phys address range), 1159 * chop it to 15MB. 1160 */ 1161 if ((pagesinext > 3840) && (pagesinext < 4096)) 1162 pagesinext = 3840; 1163 1164 /* 1165 * Maxmem isn't the "maximum memory", it's one larger than the 1166 * highest page of the physical address space. It should be 1167 * called something like "Maxphyspage". 1168 */ 1169 Maxmem = pagesinext + 0x100000/PAGE_SIZE; 1170 1171#ifdef MAXMEM 1172 Maxmem = MAXMEM/4; 1173#endif 1174 1175#if NNPX > 0 1176 idp = find_isadev(isa_devtab_null, &npxdriver, 0); 1177 if (idp != NULL && idp->id_msize != 0) 1178 Maxmem = idp->id_msize / 4; 1179#endif 1180 1181 /* call pmap initialization to make new kernel address space */ 1182 pmap_bootstrap (first, 0); 1183 1184 /* 1185 * Size up each available chunk of physical memory. 1186 */ 1187 1188 /* 1189 * We currently don't bother testing base memory. 1190 * XXX ...but we probably should. 1191 */ 1192 pa_indx = 0; 1193 badpages = 0; 1194 if (pagesinbase > 1) { 1195 phys_avail[pa_indx++] = PAGE_SIZE; /* skip first page of memory */ 1196 phys_avail[pa_indx] = ptoa(pagesinbase);/* memory up to the ISA hole */ 1197 physmem = pagesinbase - 1; 1198 } else { 1199 /* point at first chunk end */ 1200 pa_indx++; 1201 } 1202 1203 for (target_page = avail_start; target_page < ptoa(Maxmem); target_page += PAGE_SIZE) { 1204 int tmp, page_bad = FALSE; 1205 1206 /* 1207 * map page into kernel: valid, read/write, non-cacheable 1208 */ 1209 *(int *)CMAP1 = PG_V | PG_RW | PG_N | target_page; 1210 invltlb(); 1211 1212 tmp = *(int *)CADDR1; 1213 /* 1214 * Test for alternating 1's and 0's 1215 */ 1216 *(volatile int *)CADDR1 = 0xaaaaaaaa; 1217 if (*(volatile int *)CADDR1 != 0xaaaaaaaa) { 1218 page_bad = TRUE; 1219 } 1220 /* 1221 * Test for alternating 0's and 1's 1222 */ 1223 *(volatile int *)CADDR1 = 0x55555555; 1224 if (*(volatile int *)CADDR1 != 0x55555555) { 1225 page_bad = TRUE; 1226 } 1227 /* 1228 * Test for all 1's 1229 */ 1230 *(volatile int *)CADDR1 = 0xffffffff; 1231 if (*(volatile int *)CADDR1 != 0xffffffff) { 1232 page_bad = TRUE; 1233 } 1234 /* 1235 * Test for all 0's 1236 */ 1237 *(volatile int *)CADDR1 = 0x0; 1238 if (*(volatile int *)CADDR1 != 0x0) { 1239 /* 1240 * test of page failed 1241 */ 1242 page_bad = TRUE; 1243 } 1244 /* 1245 * Restore original value. 1246 */ 1247 *(int *)CADDR1 = tmp; 1248 1249 /* 1250 * Adjust array of valid/good pages. 1251 */ 1252 if (page_bad == FALSE) { 1253 /* 1254 * If this good page is a continuation of the 1255 * previous set of good pages, then just increase 1256 * the end pointer. Otherwise start a new chunk. 1257 * Note that "end" points one higher than end, 1258 * making the range >= start and < end. 1259 */ 1260 if (phys_avail[pa_indx] == target_page) { 1261 phys_avail[pa_indx] += PAGE_SIZE; 1262 } else { 1263 pa_indx++; 1264 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 1265 printf("Too many holes in the physical address space, giving up\n"); 1266 pa_indx--; 1267 break; 1268 } 1269 phys_avail[pa_indx++] = target_page; /* start */ 1270 phys_avail[pa_indx] = target_page + PAGE_SIZE; /* end */ 1271 } 1272 physmem++; 1273 } else { 1274 badpages++; 1275 page_bad = FALSE; 1276 } 1277 } 1278 1279 *(int *)CMAP1 = 0; 1280 invltlb(); 1281 1282 /* 1283 * XXX 1284 * The last chunk must contain at least one page plus the message 1285 * buffer to avoid complicating other code (message buffer address 1286 * calculation, etc.). 1287 */ 1288 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 1289 round_page(sizeof(struct msgbuf)) >= phys_avail[pa_indx]) { 1290 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 1291 phys_avail[pa_indx--] = 0; 1292 phys_avail[pa_indx--] = 0; 1293 } 1294 1295 Maxmem = atop(phys_avail[pa_indx]); 1296 1297 /* Trim off space for the message buffer. */ 1298 phys_avail[pa_indx] -= round_page(sizeof(struct msgbuf)); 1299 1300 avail_end = phys_avail[pa_indx]; 1301 1302 /* now running on new page tables, configured,and u/iom is accessible */ 1303 1304 /* Map the message buffer. */ 1305 for (off = 0; off < round_page(sizeof(struct msgbuf)); off += PAGE_SIZE) 1306 pmap_enter(kernel_pmap, (vm_offset_t)msgbufp + off, 1307 avail_end + off, VM_PROT_ALL, TRUE); 1308 msgbufmapped = 1; 1309 1310 /* make an initial tss so cpu can get interrupt stack on syscall! */ 1311 common_tss.tss_esp0 = (int) proc0.p_addr + UPAGES*PAGE_SIZE; 1312 common_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ; 1313 common_tss.tss_ioopt = (sizeof common_tss) << 16; 1314 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 1315 ltr(gsel_tss); 1316 1317 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 = 1318 dblfault_tss.tss_esp2 = (int) &dblfault_stack[sizeof(dblfault_stack)]; 1319 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 = 1320 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL); 1321 dblfault_tss.tss_cr3 = IdlePTD; 1322 dblfault_tss.tss_eip = (int) dblfault_handler; 1323 dblfault_tss.tss_eflags = PSL_KERNEL; 1324 dblfault_tss.tss_ds = dblfault_tss.tss_es = dblfault_tss.tss_fs = 1325 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL); 1326 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL); 1327 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL); 1328 1329#ifdef TSS_IS_CACHED /* cpu_switch helper */ 1330 tssptr = &gdt[GPROC0_SEL].sd; 1331#endif 1332 1333 /* make a call gate to reenter kernel with */ 1334 gdp = &ldt[LSYS5CALLS_SEL].gd; 1335 1336 x = (int) &IDTVEC(syscall); 1337 gdp->gd_looffset = x++; 1338 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL); 1339 gdp->gd_stkcpy = 1; 1340 gdp->gd_type = SDT_SYS386CGT; 1341 gdp->gd_dpl = SEL_UPL; 1342 gdp->gd_p = 1; 1343 gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16; 1344 1345 /* XXX does this work? */ 1346 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL]; 1347 1348 /* transfer to user mode */ 1349 1350 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL); 1351 _udatasel = LSEL(LUDATA_SEL, SEL_UPL); 1352 1353 /* setup proc 0's pcb */ 1354 proc0.p_addr->u_pcb.pcb_flags = 0; 1355 proc0.p_addr->u_pcb.pcb_cr3 = IdlePTD; 1356} 1357 1358/* 1359 * The registers are in the frame; the frame is in the user area of 1360 * the process in question; when the process is active, the registers 1361 * are in "the kernel stack"; when it's not, they're still there, but 1362 * things get flipped around. So, since p->p_md.md_regs is the whole address 1363 * of the register set, take its offset from the kernel stack, and 1364 * index into the user block. Don't you just *love* virtual memory? 1365 * (I'm starting to think seymour is right...) 1366 */ 1367#define TF_REGP(p) ((struct trapframe *)(p)->p_md.md_regs) 1368 1369int 1370ptrace_set_pc(p, addr) 1371 struct proc *p; 1372 unsigned int addr; 1373{ 1374 TF_REGP(p)->tf_eip = addr; 1375 return (0); 1376} 1377 1378int 1379ptrace_single_step(p) 1380 struct proc *p; 1381{ 1382 TF_REGP(p)->tf_eflags |= PSL_T; 1383 return (0); 1384} 1385 1386int ptrace_write_u(p, off, data) 1387 struct proc *p; 1388 vm_offset_t off; 1389 int data; 1390{ 1391 struct trapframe frame_copy; 1392 vm_offset_t min; 1393 struct trapframe *tp; 1394 1395 /* 1396 * Privileged kernel state is scattered all over the user area. 1397 * Only allow write access to parts of regs and to fpregs. 1398 */ 1399 min = (char *)p->p_md.md_regs - (char *)p->p_addr; 1400 if (off >= min && off <= min + sizeof(struct trapframe) - sizeof(int)) { 1401 tp = TF_REGP(p); 1402 frame_copy = *tp; 1403 *(int *)((char *)&frame_copy + (off - min)) = data; 1404 if (!EFLAGS_SECURE(frame_copy.tf_eflags, tp->tf_eflags) || 1405 !CS_SECURE(frame_copy.tf_cs)) 1406 return (EINVAL); 1407 *(int*)((char *)p->p_addr + off) = data; 1408 return (0); 1409 } 1410 min = offsetof(struct user, u_pcb) + offsetof(struct pcb, pcb_savefpu); 1411 if (off >= min && off <= min + sizeof(struct save87) - sizeof(int)) { 1412 *(int*)((char *)p->p_addr + off) = data; 1413 return (0); 1414 } 1415 return (EFAULT); 1416} 1417 1418int 1419fill_regs(p, regs) 1420 struct proc *p; 1421 struct reg *regs; 1422{ 1423 struct trapframe *tp; 1424 1425 tp = TF_REGP(p); 1426 regs->r_es = tp->tf_es; 1427 regs->r_ds = tp->tf_ds; 1428 regs->r_edi = tp->tf_edi; 1429 regs->r_esi = tp->tf_esi; 1430 regs->r_ebp = tp->tf_ebp; 1431 regs->r_ebx = tp->tf_ebx; 1432 regs->r_edx = tp->tf_edx; 1433 regs->r_ecx = tp->tf_ecx; 1434 regs->r_eax = tp->tf_eax; 1435 regs->r_eip = tp->tf_eip; 1436 regs->r_cs = tp->tf_cs; 1437 regs->r_eflags = tp->tf_eflags; 1438 regs->r_esp = tp->tf_esp; 1439 regs->r_ss = tp->tf_ss; 1440 return (0); 1441} 1442 1443int 1444set_regs(p, regs) 1445 struct proc *p; 1446 struct reg *regs; 1447{ 1448 struct trapframe *tp; 1449 1450 tp = TF_REGP(p); 1451 if (!EFLAGS_SECURE(regs->r_eflags, tp->tf_eflags) || 1452 !CS_SECURE(regs->r_cs)) 1453 return (EINVAL); 1454 tp->tf_es = regs->r_es; 1455 tp->tf_ds = regs->r_ds; 1456 tp->tf_edi = regs->r_edi; 1457 tp->tf_esi = regs->r_esi; 1458 tp->tf_ebp = regs->r_ebp; 1459 tp->tf_ebx = regs->r_ebx; 1460 tp->tf_edx = regs->r_edx; 1461 tp->tf_ecx = regs->r_ecx; 1462 tp->tf_eax = regs->r_eax; 1463 tp->tf_eip = regs->r_eip; 1464 tp->tf_cs = regs->r_cs; 1465 tp->tf_eflags = regs->r_eflags; 1466 tp->tf_esp = regs->r_esp; 1467 tp->tf_ss = regs->r_ss; 1468 return (0); 1469} 1470 1471#ifndef DDB 1472void 1473Debugger(const char *msg) 1474{ 1475 printf("Debugger(\"%s\") called.\n", msg); 1476} 1477#endif /* no DDB */ 1478 1479#include <sys/disklabel.h> 1480 1481/* 1482 * Determine the size of the transfer, and make sure it is 1483 * within the boundaries of the partition. Adjust transfer 1484 * if needed, and signal errors or early completion. 1485 */ 1486int 1487bounds_check_with_label(struct buf *bp, struct disklabel *lp, int wlabel) 1488{ 1489 struct partition *p = lp->d_partitions + dkpart(bp->b_dev); 1490 int labelsect = lp->d_partitions[0].p_offset; 1491 int maxsz = p->p_size, 1492 sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT; 1493 1494 /* overwriting disk label ? */ 1495 /* XXX should also protect bootstrap in first 8K */ 1496 if (bp->b_blkno + p->p_offset <= LABELSECTOR + labelsect && 1497#if LABELSECTOR != 0 1498 bp->b_blkno + p->p_offset + sz > LABELSECTOR + labelsect && 1499#endif 1500 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 1501 bp->b_error = EROFS; 1502 goto bad; 1503 } 1504 1505#if defined(DOSBBSECTOR) && defined(notyet) 1506 /* overwriting master boot record? */ 1507 if (bp->b_blkno + p->p_offset <= DOSBBSECTOR && 1508 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 1509 bp->b_error = EROFS; 1510 goto bad; 1511 } 1512#endif 1513 1514 /* beyond partition? */ 1515 if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz) { 1516 /* if exactly at end of disk, return an EOF */ 1517 if (bp->b_blkno == maxsz) { 1518 bp->b_resid = bp->b_bcount; 1519 return(0); 1520 } 1521 /* or truncate if part of it fits */ 1522 sz = maxsz - bp->b_blkno; 1523 if (sz <= 0) { 1524 bp->b_error = EINVAL; 1525 goto bad; 1526 } 1527 bp->b_bcount = sz << DEV_BSHIFT; 1528 } 1529 1530 bp->b_pblkno = bp->b_blkno + p->p_offset; 1531 return(1); 1532 1533bad: 1534 bp->b_flags |= B_ERROR; 1535 return(-1); 1536} 1537 1538#ifdef DDB 1539 1540/* 1541 * Provide inb() and outb() as functions. They are normally only 1542 * available as macros calling inlined functions, thus cannot be 1543 * called inside DDB. 1544 * 1545 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined. 1546 */ 1547 1548#undef inb 1549#undef outb 1550 1551/* silence compiler warnings */ 1552u_char inb(u_int); 1553void outb(u_int, u_char); 1554 1555u_char 1556inb(u_int port) 1557{ 1558 u_char data; 1559 /* 1560 * We use %%dx and not %1 here because i/o is done at %dx and not at 1561 * %edx, while gcc generates inferior code (movw instead of movl) 1562 * if we tell it to load (u_short) port. 1563 */ 1564 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 1565 return (data); 1566} 1567 1568void 1569outb(u_int port, u_char data) 1570{ 1571 u_char al; 1572 /* 1573 * Use an unnecessary assignment to help gcc's register allocator. 1574 * This make a large difference for gcc-1.40 and a tiny difference 1575 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for 1576 * best results. gcc-2.6.0 can't handle this. 1577 */ 1578 al = data; 1579 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 1580} 1581 1582#endif /* DDB */ 1583