machdep.c revision 19828
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 1.211 1996/11/11 20:38:52 bde 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/ioctl.h> 65#include <sys/sysent.h> 66#include <sys/tty.h> 67#include <sys/sysctl.h> 68#include <sys/vmmeter.h> 69 70#ifdef SYSVSHM 71#include <sys/shm.h> 72#endif 73 74#ifdef SYSVMSG 75#include <sys/msg.h> 76#endif 77 78#ifdef SYSVSEM 79#include <sys/sem.h> 80#endif 81 82#include <vm/vm.h> 83#include <vm/vm_param.h> 84#include <vm/vm_prot.h> 85#include <vm/lock.h> 86#include <vm/vm_kern.h> 87#include <vm/vm_object.h> 88#include <vm/vm_page.h> 89#include <vm/vm_map.h> 90#include <vm/vm_pager.h> 91#include <vm/vm_extern.h> 92 93#include <sys/user.h> 94#include <sys/exec.h> 95#include <sys/vnode.h> 96 97#include <ddb/ddb.h> 98 99#include <net/netisr.h> 100 101#include <machine/cpu.h> 102#include <machine/npx.h> 103#include <machine/reg.h> 104#include <machine/psl.h> 105#include <machine/clock.h> 106#include <machine/specialreg.h> 107#include <machine/sysarch.h> 108#include <machine/cons.h> 109#include <machine/bootinfo.h> 110#include <machine/md_var.h> 111#ifdef PERFMON 112#include <machine/perfmon.h> 113#endif 114 115#include <i386/isa/isa_device.h> 116#include <i386/isa/rtc.h> 117#include <machine/random.h> 118 119extern void init386 __P((int first)); 120extern int ptrace_set_pc __P((struct proc *p, unsigned int addr)); 121extern int ptrace_single_step __P((struct proc *p)); 122extern int ptrace_write_u __P((struct proc *p, vm_offset_t off, int data)); 123extern void dblfault_handler __P((void)); 124 125extern void identifycpu(void); /* XXX header file */ 126extern void earlysetcpuclass(void); /* same header file */ 127 128static void cpu_startup __P((void *)); 129SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL) 130 131 132#ifdef BOUNCE_BUFFERS 133extern char *bouncememory; 134extern int maxbkva; 135#ifdef BOUNCEPAGES 136int bouncepages = BOUNCEPAGES; 137#else 138int bouncepages = 0; 139#endif 140#endif /* BOUNCE_BUFFERS */ 141 142extern int freebufspace; 143int msgbufmapped = 0; /* set when safe to use msgbuf */ 144int _udatasel, _ucodesel; 145u_int atdevbase; 146 147 148int physmem = 0; 149int cold = 1; 150 151static int 152sysctl_hw_physmem SYSCTL_HANDLER_ARGS 153{ 154 int error = sysctl_handle_int(oidp, 0, ctob(physmem), req); 155 return (error); 156} 157 158SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_INT|CTLFLAG_RD, 159 0, 0, sysctl_hw_physmem, "I", ""); 160 161static int 162sysctl_hw_usermem SYSCTL_HANDLER_ARGS 163{ 164 int error = sysctl_handle_int(oidp, 0, 165 ctob(physmem - cnt.v_wire_count), req); 166 return (error); 167} 168 169SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD, 170 0, 0, sysctl_hw_usermem, "I", ""); 171 172int boothowto = 0, bootverbose = 0, Maxmem = 0; 173static int badpages = 0; 174long dumplo; 175extern int bootdev; 176 177vm_offset_t phys_avail[10]; 178 179/* must be 2 less so 0 0 can signal end of chunks */ 180#define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(vm_offset_t)) - 2) 181 182static void setup_netisrs __P((struct linker_set *)); /* XXX declare elsewhere */ 183 184static vm_offset_t buffer_sva, buffer_eva; 185vm_offset_t clean_sva, clean_eva; 186static vm_offset_t pager_sva, pager_eva; 187extern struct linker_set netisr_set; 188 189#define offsetof(type, member) ((size_t)(&((type *)0)->member)) 190 191static void 192cpu_startup(dummy) 193 void *dummy; 194{ 195 register unsigned i; 196 register caddr_t v; 197 vm_offset_t maxaddr; 198 vm_size_t size = 0; 199 int firstaddr; 200 vm_offset_t minaddr; 201 202 if (boothowto & RB_VERBOSE) 203 bootverbose++; 204 205 /* 206 * Good {morning,afternoon,evening,night}. 207 */ 208 printf(version); 209 earlysetcpuclass(); 210 startrtclock(); 211 identifycpu(); 212#ifdef PERFMON 213 perfmon_init(); 214#endif 215 printf("real memory = %d (%dK bytes)\n", ptoa(Maxmem), ptoa(Maxmem) / 1024); 216 /* 217 * Display any holes after the first chunk of extended memory. 218 */ 219 if (badpages != 0) { 220 int indx = 1; 221 222 /* 223 * XXX skip reporting ISA hole & unmanaged kernel memory 224 */ 225 if (phys_avail[0] == PAGE_SIZE) 226 indx += 2; 227 228 printf("Physical memory hole(s):\n"); 229 for (; phys_avail[indx + 1] != 0; indx += 2) { 230 int size = phys_avail[indx + 1] - phys_avail[indx]; 231 232 printf("0x%08lx - 0x%08lx, %d bytes (%d pages)\n", phys_avail[indx], 233 phys_avail[indx + 1] - 1, size, size / PAGE_SIZE); 234 } 235 } 236 237 /* 238 * Quickly wire in netisrs. 239 */ 240 setup_netisrs(&netisr_set); 241 242 /* 243 * Allocate space for system data structures. 244 * The first available kernel virtual address is in "v". 245 * As pages of kernel virtual memory are allocated, "v" is incremented. 246 * As pages of memory are allocated and cleared, 247 * "firstaddr" is incremented. 248 * An index into the kernel page table corresponding to the 249 * virtual memory address maintained in "v" is kept in "mapaddr". 250 */ 251 252 /* 253 * Make two passes. The first pass calculates how much memory is 254 * needed and allocates it. The second pass assigns virtual 255 * addresses to the various data structures. 256 */ 257 firstaddr = 0; 258again: 259 v = (caddr_t)firstaddr; 260 261#define valloc(name, type, num) \ 262 (name) = (type *)v; v = (caddr_t)((name)+(num)) 263#define valloclim(name, type, num, lim) \ 264 (name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num))) 265 valloc(callout, struct callout, ncallout); 266#ifdef SYSVSHM 267 valloc(shmsegs, struct shmid_ds, shminfo.shmmni); 268#endif 269#ifdef SYSVSEM 270 valloc(sema, struct semid_ds, seminfo.semmni); 271 valloc(sem, struct sem, seminfo.semmns); 272 /* This is pretty disgusting! */ 273 valloc(semu, int, (seminfo.semmnu * seminfo.semusz) / sizeof(int)); 274#endif 275#ifdef SYSVMSG 276 valloc(msgpool, char, msginfo.msgmax); 277 valloc(msgmaps, struct msgmap, msginfo.msgseg); 278 valloc(msghdrs, struct msg, msginfo.msgtql); 279 valloc(msqids, struct msqid_ds, msginfo.msgmni); 280#endif 281 282 if (nbuf == 0) { 283 nbuf = 30; 284 if( physmem > 1024) 285 nbuf += min((physmem - 1024) / 6, 2048); 286 } 287 nswbuf = max(min(nbuf/4, 128), 16); 288 289 valloc(swbuf, struct buf, nswbuf); 290 valloc(buf, struct buf, nbuf); 291 292#ifdef BOUNCE_BUFFERS 293 /* 294 * If there is more than 16MB of memory, allocate some bounce buffers 295 */ 296 if (Maxmem > 4096) { 297 if (bouncepages == 0) { 298 bouncepages = 64; 299 bouncepages += ((Maxmem - 4096) / 2048) * 32; 300 } 301 v = (caddr_t)((vm_offset_t)round_page(v)); 302 valloc(bouncememory, char, bouncepages * PAGE_SIZE); 303 } 304#endif 305 306 /* 307 * End of first pass, size has been calculated so allocate memory 308 */ 309 if (firstaddr == 0) { 310 size = (vm_size_t)(v - firstaddr); 311 firstaddr = (int)kmem_alloc(kernel_map, round_page(size)); 312 if (firstaddr == 0) 313 panic("startup: no room for tables"); 314 goto again; 315 } 316 317 /* 318 * End of second pass, addresses have been assigned 319 */ 320 if ((vm_size_t)(v - firstaddr) != size) 321 panic("startup: table size inconsistency"); 322 323#ifdef BOUNCE_BUFFERS 324 clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva, 325 (nbuf*MAXBSIZE) + (nswbuf*MAXPHYS) + 326 maxbkva + pager_map_size, TRUE); 327 io_map = kmem_suballoc(clean_map, &minaddr, &maxaddr, maxbkva, FALSE); 328#else 329 clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva, 330 (nbuf*MAXBSIZE) + (nswbuf*MAXPHYS) + pager_map_size, TRUE); 331#endif 332 buffer_map = kmem_suballoc(clean_map, &buffer_sva, &buffer_eva, 333 (nbuf*MAXBSIZE), TRUE); 334 pager_map = kmem_suballoc(clean_map, &pager_sva, &pager_eva, 335 (nswbuf*MAXPHYS) + pager_map_size, TRUE); 336 exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, 337 (16*ARG_MAX), TRUE); 338 exech_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, 339 (32*ARG_MAX), TRUE); 340 u_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, 341 (maxproc*UPAGES*PAGE_SIZE), FALSE); 342 343 /* 344 * Finally, allocate mbuf pool. Since mclrefcnt is an off-size 345 * we use the more space efficient malloc in place of kmem_alloc. 346 */ 347 mclrefcnt = (char *)malloc(nmbclusters+PAGE_SIZE/MCLBYTES, 348 M_MBUF, M_NOWAIT); 349 bzero(mclrefcnt, nmbclusters+PAGE_SIZE/MCLBYTES); 350 mcl_map = kmem_suballoc(kmem_map, (vm_offset_t *)&mbutl, &maxaddr, 351 nmbclusters * MCLBYTES, FALSE); 352 { 353 vm_size_t mb_map_size; 354 mb_map_size = nmbufs * MSIZE; 355 mb_map = kmem_suballoc(kmem_map, &minaddr, &maxaddr, 356 round_page(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_BOOT) && defined(USERCONFIG) 367 boothowto |= RB_CONFIG; 368#endif 369 370 if (boothowto & RB_CONFIG) { 371#ifdef USERCONFIG 372 userconfig(); 373 cninit(); /* the preferred console may have changed */ 374#else 375 printf("Sorry! no userconfig in this kernel\n"); 376#endif 377 } 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 /* 396 * In verbose mode, print out the BIOS's idea of the disk geometries. 397 */ 398 if (bootverbose) { 399 printf("BIOS Geometries:\n"); 400 for (i = 0; i < N_BIOS_GEOM; i++) { 401 unsigned long bios_geom; 402 int max_cylinder, max_head, max_sector; 403 404 bios_geom = bootinfo.bi_bios_geom[i]; 405 406 /* 407 * XXX the bootstrap punts a 1200K floppy geometry 408 * when the get-disk-geometry interrupt fails. Skip 409 * drives that have this geometry. 410 */ 411 if (bios_geom == 0x4f010f) 412 continue; 413 414 printf(" %x:%08lx ", i, bios_geom); 415 max_cylinder = bios_geom >> 16; 416 max_head = (bios_geom >> 8) & 0xff; 417 max_sector = bios_geom & 0xff; 418 printf( 419 "0..%d=%d cylinders, 0..%d=%d heads, 1..%d=%d sectors\n", 420 max_cylinder, max_cylinder + 1, 421 max_head, max_head + 1, 422 max_sector, max_sector); 423 } 424 printf(" %d accounted for\n", bootinfo.bi_n_bios_used); 425 } 426} 427 428int 429register_netisr(num, handler) 430 int num; 431 netisr_t *handler; 432{ 433 434 if (num < 0 || num >= (sizeof(netisrs)/sizeof(*netisrs)) ) { 435 printf("register_netisr: bad isr number: %d\n", num); 436 return (EINVAL); 437 } 438 netisrs[num] = handler; 439 return (0); 440} 441 442static void 443setup_netisrs(ls) 444 struct linker_set *ls; 445{ 446 int i; 447 const struct netisrtab *nit; 448 449 for(i = 0; ls->ls_items[i]; i++) { 450 nit = (const struct netisrtab *)ls->ls_items[i]; 451 register_netisr(nit->nit_num, nit->nit_isr); 452 } 453} 454 455/* 456 * Send an interrupt to process. 457 * 458 * Stack is set up to allow sigcode stored 459 * at top to call routine, followed by kcall 460 * to sigreturn routine below. After sigreturn 461 * resets the signal mask, the stack, and the 462 * frame pointer, it returns to the user 463 * specified pc, psl. 464 */ 465void 466sendsig(catcher, sig, mask, code) 467 sig_t catcher; 468 int sig, mask; 469 u_long code; 470{ 471 register struct proc *p = curproc; 472 register int *regs; 473 register struct sigframe *fp; 474 struct sigframe sf; 475 struct sigacts *psp = p->p_sigacts; 476 int oonstack; 477 478 regs = p->p_md.md_regs; 479 oonstack = psp->ps_sigstk.ss_flags & SS_ONSTACK; 480 /* 481 * Allocate and validate space for the signal handler context. 482 */ 483 if ((psp->ps_flags & SAS_ALTSTACK) && !oonstack && 484 (psp->ps_sigonstack & sigmask(sig))) { 485 fp = (struct sigframe *)(psp->ps_sigstk.ss_sp + 486 psp->ps_sigstk.ss_size - sizeof(struct sigframe)); 487 psp->ps_sigstk.ss_flags |= SS_ONSTACK; 488 } else { 489 fp = (struct sigframe *)regs[tESP] - 1; 490 } 491 492 /* 493 * grow() will return FALSE if the fp will not fit inside the stack 494 * and the stack can not be grown. useracc will return FALSE 495 * if access is denied. 496 */ 497 if ((grow(p, (int)fp) == FALSE) || 498 (useracc((caddr_t)fp, sizeof (struct sigframe), B_WRITE) == FALSE)) { 499 /* 500 * Process has trashed its stack; give it an illegal 501 * instruction to halt it in its tracks. 502 */ 503 SIGACTION(p, SIGILL) = SIG_DFL; 504 sig = sigmask(SIGILL); 505 p->p_sigignore &= ~sig; 506 p->p_sigcatch &= ~sig; 507 p->p_sigmask &= ~sig; 508 psignal(p, SIGILL); 509 return; 510 } 511 512 /* 513 * Build the argument list for the signal handler. 514 */ 515 if (p->p_sysent->sv_sigtbl) { 516 if (sig < p->p_sysent->sv_sigsize) 517 sig = p->p_sysent->sv_sigtbl[sig]; 518 else 519 sig = p->p_sysent->sv_sigsize + 1; 520 } 521 sf.sf_signum = sig; 522 sf.sf_code = code; 523 sf.sf_scp = &fp->sf_sc; 524 sf.sf_addr = (char *) regs[tERR]; 525 sf.sf_handler = catcher; 526 527 /* save scratch registers */ 528 sf.sf_sc.sc_eax = regs[tEAX]; 529 sf.sf_sc.sc_ebx = regs[tEBX]; 530 sf.sf_sc.sc_ecx = regs[tECX]; 531 sf.sf_sc.sc_edx = regs[tEDX]; 532 sf.sf_sc.sc_esi = regs[tESI]; 533 sf.sf_sc.sc_edi = regs[tEDI]; 534 sf.sf_sc.sc_cs = regs[tCS]; 535 sf.sf_sc.sc_ds = regs[tDS]; 536 sf.sf_sc.sc_ss = regs[tSS]; 537 sf.sf_sc.sc_es = regs[tES]; 538 sf.sf_sc.sc_isp = regs[tISP]; 539 540 /* 541 * Build the signal context to be used by sigreturn. 542 */ 543 sf.sf_sc.sc_onstack = oonstack; 544 sf.sf_sc.sc_mask = mask; 545 sf.sf_sc.sc_sp = regs[tESP]; 546 sf.sf_sc.sc_fp = regs[tEBP]; 547 sf.sf_sc.sc_pc = regs[tEIP]; 548 sf.sf_sc.sc_ps = regs[tEFLAGS]; 549 550 /* 551 * Copy the sigframe out to the user's stack. 552 */ 553 if (copyout(&sf, fp, sizeof(struct sigframe)) != 0) { 554 /* 555 * Something is wrong with the stack pointer. 556 * ...Kill the process. 557 */ 558 sigexit(p, SIGILL); 559 }; 560 561 regs[tESP] = (int)fp; 562 regs[tEIP] = (int)(((char *)PS_STRINGS) - *(p->p_sysent->sv_szsigcode)); 563 regs[tEFLAGS] &= ~PSL_VM; 564 regs[tCS] = _ucodesel; 565 regs[tDS] = _udatasel; 566 regs[tES] = _udatasel; 567 regs[tSS] = _udatasel; 568} 569 570/* 571 * System call to cleanup state after a signal 572 * has been taken. Reset signal mask and 573 * stack state from context left by sendsig (above). 574 * Return to previous pc and psl as specified by 575 * context left by sendsig. Check carefully to 576 * make sure that the user has not modified the 577 * state to gain improper privileges. 578 */ 579int 580sigreturn(p, uap, retval) 581 struct proc *p; 582 struct sigreturn_args /* { 583 struct sigcontext *sigcntxp; 584 } */ *uap; 585 int *retval; 586{ 587 register struct sigcontext *scp; 588 register struct sigframe *fp; 589 register int *regs = p->p_md.md_regs; 590 int eflags; 591 592 /* 593 * (XXX old comment) regs[tESP] points to the return address. 594 * The user scp pointer is above that. 595 * The return address is faked in the signal trampoline code 596 * for consistency. 597 */ 598 scp = uap->sigcntxp; 599 fp = (struct sigframe *) 600 ((caddr_t)scp - offsetof(struct sigframe, sf_sc)); 601 602 if (useracc((caddr_t)fp, sizeof (*fp), 0) == 0) 603 return(EINVAL); 604 605 /* 606 * Don't allow users to change privileged or reserved flags. 607 */ 608#define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 609 eflags = scp->sc_ps; 610 /* 611 * XXX do allow users to change the privileged flag PSL_RF. The 612 * cpu sets PSL_RF in tf_eflags for faults. Debuggers should 613 * sometimes set it there too. tf_eflags is kept in the signal 614 * context during signal handling and there is no other place 615 * to remember it, so the PSL_RF bit may be corrupted by the 616 * signal handler without us knowing. Corruption of the PSL_RF 617 * bit at worst causes one more or one less debugger trap, so 618 * allowing it is fairly harmless. 619 */ 620 if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs[tEFLAGS] & ~PSL_RF)) { 621#ifdef DEBUG 622 printf("sigreturn: eflags = 0x%x\n", eflags); 623#endif 624 return(EINVAL); 625 } 626 627 /* 628 * Don't allow users to load a valid privileged %cs. Let the 629 * hardware check for invalid selectors, excess privilege in 630 * other selectors, invalid %eip's and invalid %esp's. 631 */ 632#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 633 if (!CS_SECURE(scp->sc_cs)) { 634#ifdef DEBUG 635 printf("sigreturn: cs = 0x%x\n", scp->sc_cs); 636#endif 637 trapsignal(p, SIGBUS, T_PROTFLT); 638 return(EINVAL); 639 } 640 641 /* restore scratch registers */ 642 regs[tEAX] = scp->sc_eax; 643 regs[tEBX] = scp->sc_ebx; 644 regs[tECX] = scp->sc_ecx; 645 regs[tEDX] = scp->sc_edx; 646 regs[tESI] = scp->sc_esi; 647 regs[tEDI] = scp->sc_edi; 648 regs[tCS] = scp->sc_cs; 649 regs[tDS] = scp->sc_ds; 650 regs[tES] = scp->sc_es; 651 regs[tSS] = scp->sc_ss; 652 regs[tISP] = scp->sc_isp; 653 654 if (useracc((caddr_t)scp, sizeof (*scp), 0) == 0) 655 return(EINVAL); 656 657 if (scp->sc_onstack & 01) 658 p->p_sigacts->ps_sigstk.ss_flags |= SS_ONSTACK; 659 else 660 p->p_sigacts->ps_sigstk.ss_flags &= ~SS_ONSTACK; 661 p->p_sigmask = scp->sc_mask &~ 662 (sigmask(SIGKILL)|sigmask(SIGCONT)|sigmask(SIGSTOP)); 663 regs[tEBP] = scp->sc_fp; 664 regs[tESP] = scp->sc_sp; 665 regs[tEIP] = scp->sc_pc; 666 regs[tEFLAGS] = eflags; 667 return(EJUSTRETURN); 668} 669 670/* 671 * Machine depdnetnt boot() routine 672 * 673 * I haven't seen anything too put here yet 674 * Possibly some stuff might be grafted back here from boot() 675 */ 676void 677cpu_boot(int howto) 678{ 679} 680 681/* 682 * Shutdown the CPU as much as possible 683 */ 684void 685cpu_halt(void) 686{ 687 for (;;) 688 __asm__ ("hlt"); 689} 690 691/* 692 * Clear registers on exec 693 */ 694void 695setregs(p, entry, stack) 696 struct proc *p; 697 u_long entry; 698 u_long stack; 699{ 700 int *regs = p->p_md.md_regs; 701 702#ifdef USER_LDT 703 struct pcb *pcb = &p->p_addr->u_pcb; 704 705 /* was i386_user_cleanup() in NetBSD */ 706 if (pcb->pcb_ldt) { 707 if (pcb == curpcb) 708 lldt(GSEL(GUSERLDT_SEL, SEL_KPL)); 709 kmem_free(kernel_map, (vm_offset_t)pcb->pcb_ldt, 710 pcb->pcb_ldt_len * sizeof(union descriptor)); 711 pcb->pcb_ldt_len = (int)pcb->pcb_ldt = 0; 712 } 713#endif 714 715 bzero(regs, sizeof(struct trapframe)); 716 regs[tEIP] = entry; 717 regs[tESP] = stack; 718 regs[tEFLAGS] = PSL_USER | (regs[tEFLAGS] & PSL_T); 719 regs[tSS] = _udatasel; 720 regs[tDS] = _udatasel; 721 regs[tES] = _udatasel; 722 regs[tCS] = _ucodesel; 723 724 p->p_addr->u_pcb.pcb_flags = 0; /* no fp at all */ 725 load_cr0(rcr0() | CR0_TS); /* start emulating */ 726#if NNPX > 0 727 npxinit(__INITIAL_NPXCW__); 728#endif /* NNPX > 0 */ 729} 730 731static int 732sysctl_machdep_adjkerntz SYSCTL_HANDLER_ARGS 733{ 734 int error; 735 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 736 req); 737 if (!error && req->newptr) 738 resettodr(); 739 return (error); 740} 741 742SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 743 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 744 745SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, 746 CTLFLAG_RW, &disable_rtc_set, 0, ""); 747 748SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo, 749 CTLFLAG_RD, &bootinfo, bootinfo, ""); 750 751SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock, 752 CTLFLAG_RW, &wall_cmos_clock, 0, ""); 753 754/* 755 * Initialize 386 and configure to run kernel 756 */ 757 758/* 759 * Initialize segments & interrupt table 760 */ 761 762int currentldt; 763int _default_ldt; 764union descriptor gdt[NGDT]; /* global descriptor table */ 765struct gate_descriptor idt[NIDT]; /* interrupt descriptor table */ 766union descriptor ldt[NLDT]; /* local descriptor table */ 767 768static struct i386tss dblfault_tss; 769static char dblfault_stack[PAGE_SIZE]; 770 771extern struct user *proc0paddr; 772 773/* software prototypes -- in more palatable form */ 774struct soft_segment_descriptor gdt_segs[] = { 775/* GNULL_SEL 0 Null Descriptor */ 776{ 0x0, /* segment base address */ 777 0x0, /* length */ 778 0, /* segment type */ 779 0, /* segment descriptor priority level */ 780 0, /* segment descriptor present */ 781 0, 0, 782 0, /* default 32 vs 16 bit size */ 783 0 /* limit granularity (byte/page units)*/ }, 784/* GCODE_SEL 1 Code Descriptor for kernel */ 785{ 0x0, /* segment base address */ 786 0xfffff, /* length - all address space */ 787 SDT_MEMERA, /* segment type */ 788 0, /* segment descriptor priority level */ 789 1, /* segment descriptor present */ 790 0, 0, 791 1, /* default 32 vs 16 bit size */ 792 1 /* limit granularity (byte/page units)*/ }, 793/* GDATA_SEL 2 Data Descriptor for kernel */ 794{ 0x0, /* segment base address */ 795 0xfffff, /* length - all address space */ 796 SDT_MEMRWA, /* segment type */ 797 0, /* segment descriptor priority level */ 798 1, /* segment descriptor present */ 799 0, 0, 800 1, /* default 32 vs 16 bit size */ 801 1 /* limit granularity (byte/page units)*/ }, 802/* GLDT_SEL 3 LDT Descriptor */ 803{ (int) ldt, /* segment base address */ 804 sizeof(ldt)-1, /* length - all address space */ 805 SDT_SYSLDT, /* segment type */ 806 0, /* segment descriptor priority level */ 807 1, /* segment descriptor present */ 808 0, 0, 809 0, /* unused - default 32 vs 16 bit size */ 810 0 /* limit granularity (byte/page units)*/ }, 811/* GTGATE_SEL 4 Null Descriptor - Placeholder */ 812{ 0x0, /* segment base address */ 813 0x0, /* length - all address space */ 814 0, /* segment type */ 815 0, /* segment descriptor priority level */ 816 0, /* segment descriptor present */ 817 0, 0, 818 0, /* default 32 vs 16 bit size */ 819 0 /* limit granularity (byte/page units)*/ }, 820/* GPANIC_SEL 5 Panic Tss Descriptor */ 821{ (int) &dblfault_tss, /* segment base address */ 822 sizeof(struct i386tss)-1,/* length - all address space */ 823 SDT_SYS386TSS, /* segment type */ 824 0, /* segment descriptor priority level */ 825 1, /* segment descriptor present */ 826 0, 0, 827 0, /* unused - default 32 vs 16 bit size */ 828 0 /* limit granularity (byte/page units)*/ }, 829/* GPROC0_SEL 6 Proc 0 Tss Descriptor */ 830{ (int) kstack, /* segment base address */ 831 sizeof(struct i386tss)-1,/* length - all address space */ 832 SDT_SYS386TSS, /* segment type */ 833 0, /* segment descriptor priority level */ 834 1, /* segment descriptor present */ 835 0, 0, 836 0, /* unused - default 32 vs 16 bit size */ 837 0 /* limit granularity (byte/page units)*/ }, 838/* GUSERLDT_SEL 7 User LDT Descriptor per process */ 839{ (int) ldt, /* segment base address */ 840 (512 * sizeof(union descriptor)-1), /* length */ 841 SDT_SYSLDT, /* segment type */ 842 0, /* segment descriptor priority level */ 843 1, /* segment descriptor present */ 844 0, 0, 845 0, /* unused - default 32 vs 16 bit size */ 846 0 /* limit granularity (byte/page units)*/ }, 847/* GAPMCODE32_SEL 8 APM BIOS 32-bit interface (32bit Code) */ 848{ 0, /* segment base address (overwritten by APM) */ 849 0xfffff, /* length */ 850 SDT_MEMERA, /* segment type */ 851 0, /* segment descriptor priority level */ 852 1, /* segment descriptor present */ 853 0, 0, 854 1, /* default 32 vs 16 bit size */ 855 1 /* limit granularity (byte/page units)*/ }, 856/* GAPMCODE16_SEL 9 APM BIOS 32-bit interface (16bit Code) */ 857{ 0, /* segment base address (overwritten by APM) */ 858 0xfffff, /* length */ 859 SDT_MEMERA, /* segment type */ 860 0, /* segment descriptor priority level */ 861 1, /* segment descriptor present */ 862 0, 0, 863 0, /* default 32 vs 16 bit size */ 864 1 /* limit granularity (byte/page units)*/ }, 865/* GAPMDATA_SEL 10 APM BIOS 32-bit interface (Data) */ 866{ 0, /* segment base address (overwritten by APM) */ 867 0xfffff, /* length */ 868 SDT_MEMRWA, /* segment type */ 869 0, /* segment descriptor priority level */ 870 1, /* segment descriptor present */ 871 0, 0, 872 1, /* default 32 vs 16 bit size */ 873 1 /* limit granularity (byte/page units)*/ }, 874}; 875 876static struct soft_segment_descriptor ldt_segs[] = { 877 /* Null Descriptor - overwritten by call gate */ 878{ 0x0, /* segment base address */ 879 0x0, /* length - all address space */ 880 0, /* segment type */ 881 0, /* segment descriptor priority level */ 882 0, /* segment descriptor present */ 883 0, 0, 884 0, /* default 32 vs 16 bit size */ 885 0 /* limit granularity (byte/page units)*/ }, 886 /* Null Descriptor - overwritten by call gate */ 887{ 0x0, /* segment base address */ 888 0x0, /* length - all address space */ 889 0, /* segment type */ 890 0, /* segment descriptor priority level */ 891 0, /* segment descriptor present */ 892 0, 0, 893 0, /* default 32 vs 16 bit size */ 894 0 /* limit granularity (byte/page units)*/ }, 895 /* Null Descriptor - overwritten by call gate */ 896{ 0x0, /* segment base address */ 897 0x0, /* length - all address space */ 898 0, /* segment type */ 899 0, /* segment descriptor priority level */ 900 0, /* segment descriptor present */ 901 0, 0, 902 0, /* default 32 vs 16 bit size */ 903 0 /* limit granularity (byte/page units)*/ }, 904 /* Code Descriptor for user */ 905{ 0x0, /* segment base address */ 906 0xfffff, /* length - all address space */ 907 SDT_MEMERA, /* segment type */ 908 SEL_UPL, /* segment descriptor priority level */ 909 1, /* segment descriptor present */ 910 0, 0, 911 1, /* default 32 vs 16 bit size */ 912 1 /* limit granularity (byte/page units)*/ }, 913 /* Data Descriptor for user */ 914{ 0x0, /* segment base address */ 915 0xfffff, /* length - all address space */ 916 SDT_MEMRWA, /* segment type */ 917 SEL_UPL, /* segment descriptor priority level */ 918 1, /* segment descriptor present */ 919 0, 0, 920 1, /* default 32 vs 16 bit size */ 921 1 /* limit granularity (byte/page units)*/ }, 922}; 923 924void 925setidt(idx, func, typ, dpl, selec) 926 int idx; 927 inthand_t *func; 928 int typ; 929 int dpl; 930 int selec; 931{ 932 struct gate_descriptor *ip = idt + idx; 933 934 ip->gd_looffset = (int)func; 935 ip->gd_selector = selec; 936 ip->gd_stkcpy = 0; 937 ip->gd_xx = 0; 938 ip->gd_type = typ; 939 ip->gd_dpl = dpl; 940 ip->gd_p = 1; 941 ip->gd_hioffset = ((int)func)>>16 ; 942} 943 944#define IDTVEC(name) __CONCAT(X,name) 945 946extern inthand_t 947 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 948 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 949 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 950 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 951 IDTVEC(syscall), IDTVEC(int0x80_syscall); 952 953void 954sdtossd(sd, ssd) 955 struct segment_descriptor *sd; 956 struct soft_segment_descriptor *ssd; 957{ 958 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 959 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 960 ssd->ssd_type = sd->sd_type; 961 ssd->ssd_dpl = sd->sd_dpl; 962 ssd->ssd_p = sd->sd_p; 963 ssd->ssd_def32 = sd->sd_def32; 964 ssd->ssd_gran = sd->sd_gran; 965} 966 967void 968init386(first) 969 int first; 970{ 971 int x; 972 unsigned biosbasemem, biosextmem; 973 struct gate_descriptor *gdp; 974 int gsel_tss; 975 struct isa_device *idp; 976 /* table descriptors - used to load tables by microp */ 977 struct region_descriptor r_gdt, r_idt; 978 int pagesinbase, pagesinext; 979 int target_page, pa_indx; 980 int off; 981 982 proc0.p_addr = proc0paddr; 983 984 atdevbase = ISA_HOLE_START + KERNBASE; 985 986 /* 987 * Initialize the console before we print anything out. 988 */ 989 cninit(); 990 991 /* 992 * make gdt memory segments, the code segment goes up to end of the 993 * page with etext in it, the data segment goes to the end of 994 * the address space 995 */ 996 /* 997 * XXX text protection is temporarily (?) disabled. The limit was 998 * i386_btop(round_page(etext)) - 1. 999 */ 1000 gdt_segs[GCODE_SEL].ssd_limit = i386_btop(0) - 1; 1001 gdt_segs[GDATA_SEL].ssd_limit = i386_btop(0) - 1; 1002 for (x = 0; x < NGDT; x++) 1003 ssdtosd(&gdt_segs[x], &gdt[x].sd); 1004 1005 /* make ldt memory segments */ 1006 /* 1007 * The data segment limit must not cover the user area because we 1008 * don't want the user area to be writable in copyout() etc. (page 1009 * level protection is lost in kernel mode on 386's). Also, we 1010 * don't want the user area to be writable directly (page level 1011 * protection of the user area is not available on 486's with 1012 * CR0_WP set, because there is no user-read/kernel-write mode). 1013 * 1014 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it 1015 * should be spelled ...MAX_USER... 1016 */ 1017#define VM_END_USER_RW_ADDRESS VM_MAXUSER_ADDRESS 1018 /* 1019 * The code segment limit has to cover the user area until we move 1020 * the signal trampoline out of the user area. This is safe because 1021 * the code segment cannot be written to directly. 1022 */ 1023#define VM_END_USER_R_ADDRESS (VM_END_USER_RW_ADDRESS + UPAGES * PAGE_SIZE) 1024 ldt_segs[LUCODE_SEL].ssd_limit = i386_btop(VM_END_USER_R_ADDRESS) - 1; 1025 ldt_segs[LUDATA_SEL].ssd_limit = i386_btop(VM_END_USER_RW_ADDRESS) - 1; 1026 /* Note. eventually want private ldts per process */ 1027 for (x = 0; x < NLDT; x++) 1028 ssdtosd(&ldt_segs[x], &ldt[x].sd); 1029 1030 /* exceptions */ 1031 for (x = 0; x < NIDT; x++) 1032 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1033 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1034 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1035 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1036 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1037 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1038 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1039 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1040 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1041 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL)); 1042 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1043 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1044 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1045 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1046 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1047 setidt(14, &IDTVEC(page), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1048 setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1049 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1050 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1051 setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1052 setidt(0x80, &IDTVEC(int0x80_syscall), 1053 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1054 1055#include "isa.h" 1056#if NISA >0 1057 isa_defaultirq(); 1058#endif 1059 rand_initialize(); 1060 1061 r_gdt.rd_limit = sizeof(gdt) - 1; 1062 r_gdt.rd_base = (int) gdt; 1063 lgdt(&r_gdt); 1064 1065 r_idt.rd_limit = sizeof(idt) - 1; 1066 r_idt.rd_base = (int) idt; 1067 lidt(&r_idt); 1068 1069 _default_ldt = GSEL(GLDT_SEL, SEL_KPL); 1070 lldt(_default_ldt); 1071 currentldt = _default_ldt; 1072 1073#ifdef DDB 1074 kdb_init(); 1075 if (boothowto & RB_KDB) 1076 Debugger("Boot flags requested debugger"); 1077#endif 1078 1079 /* Use BIOS values stored in RTC CMOS RAM, since probing 1080 * breaks certain 386 AT relics. 1081 */ 1082 biosbasemem = rtcin(RTC_BASELO)+ (rtcin(RTC_BASEHI)<<8); 1083 biosextmem = rtcin(RTC_EXTLO)+ (rtcin(RTC_EXTHI)<<8); 1084 1085 /* 1086 * If BIOS tells us that it has more than 640k in the basemem, 1087 * don't believe it - set it to 640k. 1088 */ 1089 if (biosbasemem > 640) { 1090 printf("Preposterous RTC basemem of %dK, truncating to 640K\n", 1091 biosbasemem); 1092 biosbasemem = 640; 1093 } 1094 if (bootinfo.bi_memsizes_valid && bootinfo.bi_basemem > 640) { 1095 printf("Preposterous BIOS basemem of %dK, truncating to 640K\n", 1096 bootinfo.bi_basemem); 1097 bootinfo.bi_basemem = 640; 1098 } 1099 1100 /* 1101 * Warn if the official BIOS interface disagrees with the RTC 1102 * interface used above about the amount of base memory or the 1103 * amount of extended memory. Prefer the BIOS value for the base 1104 * memory. This is necessary for machines that `steal' base 1105 * memory for use as BIOS memory, at least if we are going to use 1106 * the BIOS for apm. Prefer the RTC value for extended memory. 1107 * Eventually the hackish interface shouldn't even be looked at. 1108 */ 1109 if (bootinfo.bi_memsizes_valid) { 1110 if (bootinfo.bi_basemem != biosbasemem) { 1111 vm_offset_t pa; 1112 1113 printf( 1114 "BIOS basemem (%ldK) != RTC basemem (%dK), setting to BIOS value\n", 1115 bootinfo.bi_basemem, biosbasemem); 1116 biosbasemem = bootinfo.bi_basemem; 1117 1118 /* 1119 * XXX if biosbasemem is now < 640, there is `hole' 1120 * between the end of base memory and the start of 1121 * ISA memory. The hole may be empty or it may 1122 * contain BIOS code or data. Map it read/write so 1123 * that the BIOS can write to it. (Memory from 0 to 1124 * the physical end of the kernel is mapped read-only 1125 * to begin with and then parts of it are remapped. 1126 * The parts that aren't remapped form holes that 1127 * remain read-only and are unused by the kernel. 1128 * The base memory area is below the physical end of 1129 * the kernel and right now forms a read-only hole. 1130 * The part of it from 0 to 1131 * (trunc_page(biosbasemem * 1024) - 1) will be 1132 * remapped and used by the kernel later.) 1133 * 1134 * This code is similar to the code used in 1135 * pmap_mapdev, but since no memory needs to be 1136 * allocated we simply change the mapping. 1137 */ 1138 for (pa = trunc_page(biosbasemem * 1024); 1139 pa < ISA_HOLE_START; pa += PAGE_SIZE) { 1140 unsigned *pte; 1141 1142 pte = (unsigned *)vtopte(pa + KERNBASE); 1143 *pte = pa | PG_RW | PG_V; 1144 } 1145 } 1146 if (bootinfo.bi_extmem != biosextmem) 1147 printf("BIOS extmem (%ldK) != RTC extmem (%dK)\n", 1148 bootinfo.bi_extmem, biosextmem); 1149 } 1150 1151 pagesinbase = biosbasemem * 1024 / PAGE_SIZE; 1152 pagesinext = biosextmem * 1024 / PAGE_SIZE; 1153 1154 /* 1155 * Special hack for chipsets that still remap the 384k hole when 1156 * there's 16MB of memory - this really confuses people that 1157 * are trying to use bus mastering ISA controllers with the 1158 * "16MB limit"; they only have 16MB, but the remapping puts 1159 * them beyond the limit. 1160 */ 1161 /* 1162 * If extended memory is between 15-16MB (16-17MB phys address range), 1163 * chop it to 15MB. 1164 */ 1165 if ((pagesinext > 3840) && (pagesinext < 4096)) 1166 pagesinext = 3840; 1167 1168 /* 1169 * Maxmem isn't the "maximum memory", it's one larger than the 1170 * highest page of the physical address space. It should be 1171 * called something like "Maxphyspage". 1172 */ 1173 Maxmem = pagesinext + 0x100000/PAGE_SIZE; 1174 1175#ifdef MAXMEM 1176 Maxmem = MAXMEM/4; 1177#endif 1178 1179 idp = find_isadev(isa_devtab_null, &npxdriver, 0); 1180 if (idp != NULL && idp->id_msize != 0) 1181 Maxmem = idp->id_msize / 4; 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 a initial tss so microp can get interrupt stack on syscall! */ 1313 proc0.p_addr->u_pcb.pcb_tss.tss_esp0 = (int) kstack + UPAGES*PAGE_SIZE; 1314 proc0.p_addr->u_pcb.pcb_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ; 1315 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 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 = dblfault_tss.tss_gs = 1325 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 ((struct i386tss *)gdt_segs[GPROC0_SEL].ssd_base)->tss_ioopt = 1330 (sizeof(struct i386tss))<<16; 1331 1332 ltr(gsel_tss); 1333 1334 /* make a call gate to reenter kernel with */ 1335 gdp = &ldt[LSYS5CALLS_SEL].gd; 1336 1337 x = (int) &IDTVEC(syscall); 1338 gdp->gd_looffset = x++; 1339 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL); 1340 gdp->gd_stkcpy = 1; 1341 gdp->gd_type = SDT_SYS386CGT; 1342 gdp->gd_dpl = SEL_UPL; 1343 gdp->gd_p = 1; 1344 gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16; 1345 1346 /* XXX does this work? */ 1347 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL]; 1348 1349 /* transfer to user mode */ 1350 1351 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL); 1352 _udatasel = LSEL(LUDATA_SEL, SEL_UPL); 1353 1354 /* setup proc 0's pcb */ 1355 proc0.p_addr->u_pcb.pcb_flags = 0; 1356 proc0.p_addr->u_pcb.pcb_cr3 = IdlePTD; 1357} 1358 1359/* 1360 * The registers are in the frame; the frame is in the user area of 1361 * the process in question; when the process is active, the registers 1362 * are in "the kernel stack"; when it's not, they're still there, but 1363 * things get flipped around. So, since p->p_md.md_regs is the whole address 1364 * of the register set, take its offset from the kernel stack, and 1365 * index into the user block. Don't you just *love* virtual memory? 1366 * (I'm starting to think seymour is right...) 1367 */ 1368#define TF_REGP(p) ((struct trapframe *) \ 1369 ((char *)(p)->p_addr \ 1370 + ((char *)(p)->p_md.md_regs - kstack))) 1371 1372int 1373ptrace_set_pc(p, addr) 1374 struct proc *p; 1375 unsigned int addr; 1376{ 1377 TF_REGP(p)->tf_eip = addr; 1378 return (0); 1379} 1380 1381int 1382ptrace_single_step(p) 1383 struct proc *p; 1384{ 1385 TF_REGP(p)->tf_eflags |= PSL_T; 1386 return (0); 1387} 1388 1389int ptrace_write_u(p, off, data) 1390 struct proc *p; 1391 vm_offset_t off; 1392 int data; 1393{ 1394 struct trapframe frame_copy; 1395 vm_offset_t min; 1396 struct trapframe *tp; 1397 1398 /* 1399 * Privileged kernel state is scattered all over the user area. 1400 * Only allow write access to parts of regs and to fpregs. 1401 */ 1402 min = (char *)p->p_md.md_regs - kstack; 1403 if (off >= min && off <= min + sizeof(struct trapframe) - sizeof(int)) { 1404 tp = TF_REGP(p); 1405 frame_copy = *tp; 1406 *(int *)((char *)&frame_copy + (off - min)) = data; 1407 if (!EFLAGS_SECURE(frame_copy.tf_eflags, tp->tf_eflags) || 1408 !CS_SECURE(frame_copy.tf_cs)) 1409 return (EINVAL); 1410 *(int*)((char *)p->p_addr + off) = data; 1411 return (0); 1412 } 1413 min = offsetof(struct user, u_pcb) + offsetof(struct pcb, pcb_savefpu); 1414 if (off >= min && off <= min + sizeof(struct save87) - sizeof(int)) { 1415 *(int*)((char *)p->p_addr + off) = data; 1416 return (0); 1417 } 1418 return (EFAULT); 1419} 1420 1421int 1422fill_regs(p, regs) 1423 struct proc *p; 1424 struct reg *regs; 1425{ 1426 struct trapframe *tp; 1427 1428 tp = TF_REGP(p); 1429 regs->r_es = tp->tf_es; 1430 regs->r_ds = tp->tf_ds; 1431 regs->r_edi = tp->tf_edi; 1432 regs->r_esi = tp->tf_esi; 1433 regs->r_ebp = tp->tf_ebp; 1434 regs->r_ebx = tp->tf_ebx; 1435 regs->r_edx = tp->tf_edx; 1436 regs->r_ecx = tp->tf_ecx; 1437 regs->r_eax = tp->tf_eax; 1438 regs->r_eip = tp->tf_eip; 1439 regs->r_cs = tp->tf_cs; 1440 regs->r_eflags = tp->tf_eflags; 1441 regs->r_esp = tp->tf_esp; 1442 regs->r_ss = tp->tf_ss; 1443 return (0); 1444} 1445 1446int 1447set_regs(p, regs) 1448 struct proc *p; 1449 struct reg *regs; 1450{ 1451 struct trapframe *tp; 1452 1453 tp = TF_REGP(p); 1454 if (!EFLAGS_SECURE(regs->r_eflags, tp->tf_eflags) || 1455 !CS_SECURE(regs->r_cs)) 1456 return (EINVAL); 1457 tp->tf_es = regs->r_es; 1458 tp->tf_ds = regs->r_ds; 1459 tp->tf_edi = regs->r_edi; 1460 tp->tf_esi = regs->r_esi; 1461 tp->tf_ebp = regs->r_ebp; 1462 tp->tf_ebx = regs->r_ebx; 1463 tp->tf_edx = regs->r_edx; 1464 tp->tf_ecx = regs->r_ecx; 1465 tp->tf_eax = regs->r_eax; 1466 tp->tf_eip = regs->r_eip; 1467 tp->tf_cs = regs->r_cs; 1468 tp->tf_eflags = regs->r_eflags; 1469 tp->tf_esp = regs->r_esp; 1470 tp->tf_ss = regs->r_ss; 1471 return (0); 1472} 1473 1474#ifndef DDB 1475void 1476Debugger(const char *msg) 1477{ 1478 printf("Debugger(\"%s\") called.\n", msg); 1479} 1480#endif /* no DDB */ 1481 1482#include <sys/disklabel.h> 1483#define b_cylin b_resid 1484/* 1485 * Determine the size of the transfer, and make sure it is 1486 * within the boundaries of the partition. Adjust transfer 1487 * if needed, and signal errors or early completion. 1488 */ 1489int 1490bounds_check_with_label(struct buf *bp, struct disklabel *lp, int wlabel) 1491{ 1492 struct partition *p = lp->d_partitions + dkpart(bp->b_dev); 1493 int labelsect = lp->d_partitions[0].p_offset; 1494 int maxsz = p->p_size, 1495 sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT; 1496 1497 /* overwriting disk label ? */ 1498 /* XXX should also protect bootstrap in first 8K */ 1499 if (bp->b_blkno + p->p_offset <= LABELSECTOR + labelsect && 1500#if LABELSECTOR != 0 1501 bp->b_blkno + p->p_offset + sz > LABELSECTOR + labelsect && 1502#endif 1503 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 1504 bp->b_error = EROFS; 1505 goto bad; 1506 } 1507 1508#if defined(DOSBBSECTOR) && defined(notyet) 1509 /* overwriting master boot record? */ 1510 if (bp->b_blkno + p->p_offset <= DOSBBSECTOR && 1511 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 1512 bp->b_error = EROFS; 1513 goto bad; 1514 } 1515#endif 1516 1517 /* beyond partition? */ 1518 if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz) { 1519 /* if exactly at end of disk, return an EOF */ 1520 if (bp->b_blkno == maxsz) { 1521 bp->b_resid = bp->b_bcount; 1522 return(0); 1523 } 1524 /* or truncate if part of it fits */ 1525 sz = maxsz - bp->b_blkno; 1526 if (sz <= 0) { 1527 bp->b_error = EINVAL; 1528 goto bad; 1529 } 1530 bp->b_bcount = sz << DEV_BSHIFT; 1531 } 1532 1533 /* calculate cylinder for disksort to order transfers with */ 1534 bp->b_pblkno = bp->b_blkno + p->p_offset; 1535 bp->b_cylin = bp->b_pblkno / lp->d_secpercyl; 1536 return(1); 1537 1538bad: 1539 bp->b_flags |= B_ERROR; 1540 return(-1); 1541} 1542