machdep.c revision 43970
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 1.325 1999/02/11 07:53:28 msmith Exp $ 39 */ 40 41#include "apm.h" 42#include "ether.h" 43#include "npx.h" 44#include "opt_atalk.h" 45#include "opt_cpu.h" 46#include "opt_ddb.h" 47#include "opt_inet.h" 48#include "opt_ipx.h" 49#include "opt_maxmem.h" 50#include "opt_msgbuf.h" 51#include "opt_perfmon.h" 52#include "opt_smp.h" 53#include "opt_sysvipc.h" 54#include "opt_user_ldt.h" 55#include "opt_userconfig.h" 56#include "opt_vm86.h" 57 58#include <sys/param.h> 59#include <sys/systm.h> 60#include <sys/sysproto.h> 61#include <sys/signalvar.h> 62#include <sys/kernel.h> 63#include <sys/linker.h> 64#include <sys/proc.h> 65#include <sys/buf.h> 66#include <sys/reboot.h> 67#include <sys/callout.h> 68#include <sys/malloc.h> 69#include <sys/mbuf.h> 70#include <sys/msgbuf.h> 71#include <sys/sysent.h> 72#include <sys/sysctl.h> 73#include <sys/vmmeter.h> 74 75#ifdef SYSVSHM 76#include <sys/shm.h> 77#endif 78 79#ifdef SYSVMSG 80#include <sys/msg.h> 81#endif 82 83#ifdef SYSVSEM 84#include <sys/sem.h> 85#endif 86 87#include <vm/vm.h> 88#include <vm/vm_param.h> 89#include <vm/vm_prot.h> 90#include <sys/lock.h> 91#include <vm/vm_kern.h> 92#include <vm/vm_object.h> 93#include <vm/vm_page.h> 94#include <vm/vm_map.h> 95#include <vm/vm_pager.h> 96#include <vm/vm_extern.h> 97 98#include <sys/user.h> 99#include <sys/exec.h> 100 101#include <ddb/ddb.h> 102 103#if defined(INET) || defined(IPX) || defined(NATM) || defined(NETATALK) \ 104 || NETHER > 0 || defined(NS) 105#define NETISR 106#endif 107 108#ifdef NETISR 109#include <net/netisr.h> 110#endif 111 112#include <machine/cpu.h> 113#include <machine/reg.h> 114#include <machine/clock.h> 115#include <machine/specialreg.h> 116#include <machine/cons.h> 117#include <machine/bootinfo.h> 118#include <machine/ipl.h> 119#include <machine/md_var.h> 120#include <machine/pcb_ext.h> /* pcb.h included via sys/user.h */ 121#ifdef SMP 122#include <machine/smp.h> 123#endif 124#ifdef PERFMON 125#include <machine/perfmon.h> 126#endif 127 128#include <i386/isa/isa_device.h> 129#include <i386/isa/intr_machdep.h> 130#ifndef VM86 131#include <i386/isa/rtc.h> 132#endif 133#include <machine/random.h> 134#include <sys/ptrace.h> 135 136extern void init386 __P((int first)); 137extern void dblfault_handler __P((void)); 138 139extern void printcpuinfo(void); /* XXX header file */ 140extern void earlysetcpuclass(void); /* same header file */ 141extern void finishidentcpu(void); 142extern void panicifcpuunsupported(void); 143extern void initializecpu(void); 144 145static void cpu_startup __P((void *)); 146SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL) 147 148static MALLOC_DEFINE(M_MBUF, "mbuf", "mbuf"); 149 150int _udatasel, _ucodesel; 151u_int atdevbase; 152 153#if defined(SWTCH_OPTIM_STATS) 154extern int swtch_optim_stats; 155SYSCTL_INT(_debug, OID_AUTO, swtch_optim_stats, 156 CTLFLAG_RD, &swtch_optim_stats, 0, ""); 157SYSCTL_INT(_debug, OID_AUTO, tlb_flush_count, 158 CTLFLAG_RD, &tlb_flush_count, 0, ""); 159#endif 160 161#ifdef PC98 162static int ispc98 = 1; 163#else 164static int ispc98 = 0; 165#endif 166SYSCTL_INT(_machdep, OID_AUTO, ispc98, CTLFLAG_RD, &ispc98, 0, ""); 167 168int physmem = 0; 169int cold = 1; 170 171static int 172sysctl_hw_physmem SYSCTL_HANDLER_ARGS 173{ 174 int error = sysctl_handle_int(oidp, 0, ctob(physmem), req); 175 return (error); 176} 177 178SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_INT|CTLFLAG_RD, 179 0, 0, sysctl_hw_physmem, "I", ""); 180 181static int 182sysctl_hw_usermem SYSCTL_HANDLER_ARGS 183{ 184 int error = sysctl_handle_int(oidp, 0, 185 ctob(physmem - cnt.v_wire_count), req); 186 return (error); 187} 188 189SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD, 190 0, 0, sysctl_hw_usermem, "I", ""); 191 192static int 193sysctl_hw_availpages SYSCTL_HANDLER_ARGS 194{ 195 int error = sysctl_handle_int(oidp, 0, 196 i386_btop(avail_end - avail_start), req); 197 return (error); 198} 199 200SYSCTL_PROC(_hw, OID_AUTO, availpages, CTLTYPE_INT|CTLFLAG_RD, 201 0, 0, sysctl_hw_availpages, "I", ""); 202 203static int 204sysctl_machdep_msgbuf SYSCTL_HANDLER_ARGS 205{ 206 int error; 207 208 /* Unwind the buffer, so that it's linear (possibly starting with 209 * some initial nulls). 210 */ 211 error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr+msgbufp->msg_bufr, 212 msgbufp->msg_size-msgbufp->msg_bufr,req); 213 if(error) return(error); 214 if(msgbufp->msg_bufr>0) { 215 error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr, 216 msgbufp->msg_bufr,req); 217 } 218 return(error); 219} 220 221SYSCTL_PROC(_machdep, OID_AUTO, msgbuf, CTLTYPE_STRING|CTLFLAG_RD, 222 0, 0, sysctl_machdep_msgbuf, "A","Contents of kernel message buffer"); 223 224static int msgbuf_clear; 225 226static int 227sysctl_machdep_msgbuf_clear SYSCTL_HANDLER_ARGS 228{ 229 int error; 230 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 231 req); 232 if (!error && req->newptr) { 233 /* Clear the buffer and reset write pointer */ 234 bzero(msgbufp->msg_ptr,msgbufp->msg_size); 235 msgbufp->msg_bufr=msgbufp->msg_bufx=0; 236 msgbuf_clear=0; 237 } 238 return (error); 239} 240 241SYSCTL_PROC(_machdep, OID_AUTO, msgbuf_clear, CTLTYPE_INT|CTLFLAG_RW, 242 &msgbuf_clear, 0, sysctl_machdep_msgbuf_clear, "I", 243 "Clear kernel message buffer"); 244 245int bootverbose = 0, Maxmem = 0; 246long dumplo; 247 248vm_offset_t phys_avail[10]; 249 250/* must be 2 less so 0 0 can signal end of chunks */ 251#define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(vm_offset_t)) - 2) 252 253#ifdef NETISR 254static void setup_netisrs __P((struct linker_set *)); 255#endif 256 257static vm_offset_t buffer_sva, buffer_eva; 258vm_offset_t clean_sva, clean_eva; 259static vm_offset_t pager_sva, pager_eva; 260#ifdef NETISR 261extern struct linker_set netisr_set; 262#endif 263#if NNPX > 0 264extern struct isa_driver npxdriver; 265#endif 266 267#define offsetof(type, member) ((size_t)(&((type *)0)->member)) 268 269static void 270cpu_startup(dummy) 271 void *dummy; 272{ 273 register unsigned i; 274 register caddr_t v; 275 vm_offset_t maxaddr; 276 vm_size_t size = 0; 277 int firstaddr; 278 vm_offset_t minaddr; 279 280 if (boothowto & RB_VERBOSE) 281 bootverbose++; 282 283 /* 284 * Good {morning,afternoon,evening,night}. 285 */ 286 printf(version); 287 earlysetcpuclass(); 288 startrtclock(); 289 printcpuinfo(); 290 panicifcpuunsupported(); 291#ifdef PERFMON 292 perfmon_init(); 293#endif 294 printf("real memory = %u (%uK bytes)\n", ptoa(Maxmem), ptoa(Maxmem) / 1024); 295 /* 296 * Display any holes after the first chunk of extended memory. 297 */ 298 if (bootverbose) { 299 int indx; 300 301 printf("Physical memory chunk(s):\n"); 302 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) { 303 int size1 = phys_avail[indx + 1] - phys_avail[indx]; 304 305 printf("0x%08x - 0x%08x, %u bytes (%u pages)\n", 306 phys_avail[indx], phys_avail[indx + 1] - 1, size1, 307 size1 / PAGE_SIZE); 308 } 309 } 310 311#ifdef NETISR 312 /* 313 * Quickly wire in netisrs. 314 */ 315 setup_netisrs(&netisr_set); 316#endif 317 318 /* 319 * Calculate callout wheel size 320 */ 321 for (callwheelsize = 1, callwheelbits = 0; 322 callwheelsize < ncallout; 323 callwheelsize <<= 1, ++callwheelbits) 324 ; 325 callwheelmask = callwheelsize - 1; 326 327 /* 328 * Allocate space for system data structures. 329 * The first available kernel virtual address is in "v". 330 * As pages of kernel virtual memory are allocated, "v" is incremented. 331 * As pages of memory are allocated and cleared, 332 * "firstaddr" is incremented. 333 * An index into the kernel page table corresponding to the 334 * virtual memory address maintained in "v" is kept in "mapaddr". 335 */ 336 337 /* 338 * Make two passes. The first pass calculates how much memory is 339 * needed and allocates it. The second pass assigns virtual 340 * addresses to the various data structures. 341 */ 342 firstaddr = 0; 343again: 344 v = (caddr_t)firstaddr; 345 346#define valloc(name, type, num) \ 347 (name) = (type *)v; v = (caddr_t)((name)+(num)) 348#define valloclim(name, type, num, lim) \ 349 (name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num))) 350 351 valloc(callout, struct callout, ncallout); 352 valloc(callwheel, struct callout_tailq, callwheelsize); 353#ifdef SYSVSHM 354 valloc(shmsegs, struct shmid_ds, shminfo.shmmni); 355#endif 356#ifdef SYSVSEM 357 valloc(sema, struct semid_ds, seminfo.semmni); 358 valloc(sem, struct sem, seminfo.semmns); 359 /* This is pretty disgusting! */ 360 valloc(semu, int, (seminfo.semmnu * seminfo.semusz) / sizeof(int)); 361#endif 362#ifdef SYSVMSG 363 valloc(msgpool, char, msginfo.msgmax); 364 valloc(msgmaps, struct msgmap, msginfo.msgseg); 365 valloc(msghdrs, struct msg, msginfo.msgtql); 366 valloc(msqids, struct msqid_ds, msginfo.msgmni); 367#endif 368 369 if (nbuf == 0) { 370 nbuf = 30; 371 if( physmem > 1024) 372 nbuf += min((physmem - 1024) / 8, 2048); 373 } 374 nswbuf = max(min(nbuf/4, 64), 16); 375 376 valloc(swbuf, struct buf, nswbuf); 377 valloc(buf, struct buf, nbuf); 378 379 380 /* 381 * End of first pass, size has been calculated so allocate memory 382 */ 383 if (firstaddr == 0) { 384 size = (vm_size_t)(v - firstaddr); 385 firstaddr = (int)kmem_alloc(kernel_map, round_page(size)); 386 if (firstaddr == 0) 387 panic("startup: no room for tables"); 388 goto again; 389 } 390 391 /* 392 * End of second pass, addresses have been assigned 393 */ 394 if ((vm_size_t)(v - firstaddr) != size) 395 panic("startup: table size inconsistency"); 396 397 clean_map = kmem_suballoc(kernel_map, &clean_sva, &clean_eva, 398 (nbuf*BKVASIZE) + (nswbuf*MAXPHYS) + pager_map_size); 399 buffer_map = kmem_suballoc(clean_map, &buffer_sva, &buffer_eva, 400 (nbuf*BKVASIZE)); 401 pager_map = kmem_suballoc(clean_map, &pager_sva, &pager_eva, 402 (nswbuf*MAXPHYS) + pager_map_size); 403 pager_map->system_map = 1; 404 exec_map = kmem_suballoc(kernel_map, &minaddr, &maxaddr, 405 (16*(ARG_MAX+(PAGE_SIZE*3)))); 406 407 /* 408 * Finally, allocate mbuf pool. Since mclrefcnt is an off-size 409 * we use the more space efficient malloc in place of kmem_alloc. 410 */ 411 { 412 vm_offset_t mb_map_size; 413 int xclusters; 414 415 /* Allow override of NMBCLUSTERS from the kernel environment */ 416 if (getenv_int("kern.ipc.nmbclusters", &xclusters) && 417 xclusters > nmbclusters) 418 nmbclusters = xclusters; 419 420 mb_map_size = nmbufs * MSIZE + nmbclusters * MCLBYTES; 421 mb_map_size = roundup2(mb_map_size, max(MCLBYTES, PAGE_SIZE)); 422 mclrefcnt = malloc(mb_map_size / MCLBYTES, M_MBUF, M_NOWAIT); 423 bzero(mclrefcnt, mb_map_size / MCLBYTES); 424 mb_map = kmem_suballoc(kmem_map, (vm_offset_t *)&mbutl, &maxaddr, 425 mb_map_size); 426 mb_map->system_map = 1; 427 } 428 429 /* 430 * Initialize callouts 431 */ 432 SLIST_INIT(&callfree); 433 for (i = 0; i < ncallout; i++) { 434 SLIST_INSERT_HEAD(&callfree, &callout[i], c_links.sle); 435 } 436 437 for (i = 0; i < callwheelsize; i++) { 438 TAILQ_INIT(&callwheel[i]); 439 } 440 441#if defined(USERCONFIG) 442 userconfig(); 443 cninit(); /* the preferred console may have changed */ 444#endif 445 446 printf("avail memory = %u (%uK bytes)\n", ptoa(cnt.v_free_count), 447 ptoa(cnt.v_free_count) / 1024); 448 449 /* 450 * Set up buffers, so they can be used to read disk labels. 451 */ 452 bufinit(); 453 vm_pager_bufferinit(); 454 455#ifdef SMP 456 /* 457 * OK, enough kmem_alloc/malloc state should be up, lets get on with it! 458 */ 459 mp_start(); /* fire up the APs and APICs */ 460 mp_announce(); 461#endif /* SMP */ 462} 463 464#ifdef NETISR 465int 466register_netisr(num, handler) 467 int num; 468 netisr_t *handler; 469{ 470 471 if (num < 0 || num >= (sizeof(netisrs)/sizeof(*netisrs)) ) { 472 printf("register_netisr: bad isr number: %d\n", num); 473 return (EINVAL); 474 } 475 netisrs[num] = handler; 476 return (0); 477} 478 479static void 480setup_netisrs(ls) 481 struct linker_set *ls; 482{ 483 int i; 484 const struct netisrtab *nit; 485 486 for(i = 0; ls->ls_items[i]; i++) { 487 nit = (const struct netisrtab *)ls->ls_items[i]; 488 register_netisr(nit->nit_num, nit->nit_isr); 489 } 490} 491#endif /* NETISR */ 492 493/* 494 * Send an interrupt to process. 495 * 496 * Stack is set up to allow sigcode stored 497 * at top to call routine, followed by kcall 498 * to sigreturn routine below. After sigreturn 499 * resets the signal mask, the stack, and the 500 * frame pointer, it returns to the user 501 * specified pc, psl. 502 */ 503void 504sendsig(catcher, sig, mask, code) 505 sig_t catcher; 506 int sig, mask; 507 u_long code; 508{ 509 register struct proc *p = curproc; 510 register struct trapframe *regs; 511 register struct sigframe *fp; 512 struct sigframe sf; 513 struct sigacts *psp = p->p_sigacts; 514 int oonstack; 515 516 regs = p->p_md.md_regs; 517 oonstack = psp->ps_sigstk.ss_flags & SS_ONSTACK; 518 /* 519 * Allocate and validate space for the signal handler context. 520 */ 521 if ((psp->ps_flags & SAS_ALTSTACK) && !oonstack && 522 (psp->ps_sigonstack & sigmask(sig))) { 523 fp = (struct sigframe *)(psp->ps_sigstk.ss_sp + 524 psp->ps_sigstk.ss_size - sizeof(struct sigframe)); 525 psp->ps_sigstk.ss_flags |= SS_ONSTACK; 526 } else { 527 fp = (struct sigframe *)regs->tf_esp - 1; 528 } 529 530 /* 531 * grow() will return FALSE if the fp will not fit inside the stack 532 * and the stack can not be grown. useracc will return FALSE 533 * if access is denied. 534 */ 535#ifdef VM_STACK 536 if ((grow_stack (p, (int)fp) == FALSE) || 537#else 538 if ((grow(p, (int)fp) == FALSE) || 539#endif 540 (useracc((caddr_t)fp, sizeof(struct sigframe), B_WRITE) == FALSE)) { 541 /* 542 * Process has trashed its stack; give it an illegal 543 * instruction to halt it in its tracks. 544 */ 545 SIGACTION(p, SIGILL) = SIG_DFL; 546 sig = sigmask(SIGILL); 547 p->p_sigignore &= ~sig; 548 p->p_sigcatch &= ~sig; 549 p->p_sigmask &= ~sig; 550 psignal(p, SIGILL); 551 return; 552 } 553 554 /* 555 * Build the argument list for the signal handler. 556 */ 557 if (p->p_sysent->sv_sigtbl) { 558 if (sig < p->p_sysent->sv_sigsize) 559 sig = p->p_sysent->sv_sigtbl[sig]; 560 else 561 sig = p->p_sysent->sv_sigsize + 1; 562 } 563 sf.sf_signum = sig; 564 sf.sf_code = code; 565 sf.sf_scp = &fp->sf_sc; 566 sf.sf_addr = (char *) regs->tf_err; 567 sf.sf_handler = catcher; 568 569 /* save scratch registers */ 570 sf.sf_sc.sc_eax = regs->tf_eax; 571 sf.sf_sc.sc_ebx = regs->tf_ebx; 572 sf.sf_sc.sc_ecx = regs->tf_ecx; 573 sf.sf_sc.sc_edx = regs->tf_edx; 574 sf.sf_sc.sc_esi = regs->tf_esi; 575 sf.sf_sc.sc_edi = regs->tf_edi; 576 sf.sf_sc.sc_cs = regs->tf_cs; 577 sf.sf_sc.sc_ds = regs->tf_ds; 578 sf.sf_sc.sc_ss = regs->tf_ss; 579 sf.sf_sc.sc_es = regs->tf_es; 580 sf.sf_sc.sc_isp = regs->tf_isp; 581 582 /* 583 * Build the signal context to be used by sigreturn. 584 */ 585 sf.sf_sc.sc_onstack = oonstack; 586 sf.sf_sc.sc_mask = mask; 587 sf.sf_sc.sc_sp = regs->tf_esp; 588 sf.sf_sc.sc_fp = regs->tf_ebp; 589 sf.sf_sc.sc_pc = regs->tf_eip; 590 sf.sf_sc.sc_ps = regs->tf_eflags; 591 sf.sf_sc.sc_trapno = regs->tf_trapno; 592 sf.sf_sc.sc_err = regs->tf_err; 593 594#ifdef VM86 595 /* 596 * If we're a vm86 process, we want to save the segment registers. 597 * We also change eflags to be our emulated eflags, not the actual 598 * eflags. 599 */ 600 if (regs->tf_eflags & PSL_VM) { 601 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 602 struct vm86_kernel *vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 603 604 sf.sf_sc.sc_gs = tf->tf_vm86_gs; 605 sf.sf_sc.sc_fs = tf->tf_vm86_fs; 606 sf.sf_sc.sc_es = tf->tf_vm86_es; 607 sf.sf_sc.sc_ds = tf->tf_vm86_ds; 608 609 if (vm86->vm86_has_vme == 0) 610 sf.sf_sc.sc_ps = (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) 611 | (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 612 613 /* 614 * We should never have PSL_T set when returning from vm86 615 * mode. It may be set here if we deliver a signal before 616 * getting to vm86 mode, so turn it off. 617 * 618 * Clear PSL_NT to inhibit T_TSSFLT faults on return from 619 * syscalls made by the signal handler. This just avoids 620 * wasting time for our lazy fixup of such faults. PSL_NT 621 * does nothing in vm86 mode, but vm86 programs can set it 622 * almost legitimately in probes for old cpu types. 623 */ 624 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_T | PSL_VIF | PSL_VIP); 625 } 626#endif /* VM86 */ 627 628 /* 629 * Copy the sigframe out to the user's stack. 630 */ 631 if (copyout(&sf, fp, sizeof(struct sigframe)) != 0) { 632 /* 633 * Something is wrong with the stack pointer. 634 * ...Kill the process. 635 */ 636 sigexit(p, SIGILL); 637 } 638 639 regs->tf_esp = (int)fp; 640 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode); 641 regs->tf_cs = _ucodesel; 642 regs->tf_ds = _udatasel; 643 regs->tf_es = _udatasel; 644 regs->tf_ss = _udatasel; 645} 646 647/* 648 * System call to cleanup state after a signal 649 * has been taken. Reset signal mask and 650 * stack state from context left by sendsig (above). 651 * Return to previous pc and psl as specified by 652 * context left by sendsig. Check carefully to 653 * make sure that the user has not modified the 654 * state to gain improper privileges. 655 */ 656int 657sigreturn(p, uap) 658 struct proc *p; 659 struct sigreturn_args /* { 660 struct sigcontext *sigcntxp; 661 } */ *uap; 662{ 663 register struct sigcontext *scp; 664 register struct sigframe *fp; 665 register struct trapframe *regs = p->p_md.md_regs; 666 int eflags; 667 668 /* 669 * (XXX old comment) regs->tf_esp points to the return address. 670 * The user scp pointer is above that. 671 * The return address is faked in the signal trampoline code 672 * for consistency. 673 */ 674 scp = uap->sigcntxp; 675 fp = (struct sigframe *) 676 ((caddr_t)scp - offsetof(struct sigframe, sf_sc)); 677 678 if (useracc((caddr_t)fp, sizeof (*fp), B_WRITE) == 0) 679 return(EFAULT); 680 681 eflags = scp->sc_ps; 682#ifdef VM86 683 if (eflags & PSL_VM) { 684 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 685 struct vm86_kernel *vm86; 686 687 /* 688 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 689 * set up the vm86 area, and we can't enter vm86 mode. 690 */ 691 if (p->p_addr->u_pcb.pcb_ext == 0) 692 return (EINVAL); 693 vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 694 if (vm86->vm86_inited == 0) 695 return (EINVAL); 696 697 /* go back to user mode if both flags are set */ 698 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 699 trapsignal(p, SIGBUS, 0); 700 701 if (vm86->vm86_has_vme) { 702 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 703 (eflags & VME_USERCHANGE) | PSL_VM; 704 } else { 705 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 706 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM; 707 } 708 tf->tf_vm86_ds = scp->sc_ds; 709 tf->tf_vm86_es = scp->sc_es; 710 tf->tf_vm86_fs = scp->sc_fs; 711 tf->tf_vm86_gs = scp->sc_gs; 712 tf->tf_ds = _udatasel; 713 tf->tf_es = _udatasel; 714 } else { 715#endif /* VM86 */ 716 /* 717 * Don't allow users to change privileged or reserved flags. 718 */ 719#define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 720 /* 721 * XXX do allow users to change the privileged flag PSL_RF. 722 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 723 * should sometimes set it there too. tf_eflags is kept in 724 * the signal context during signal handling and there is no 725 * other place to remember it, so the PSL_RF bit may be 726 * corrupted by the signal handler without us knowing. 727 * Corruption of the PSL_RF bit at worst causes one more or 728 * one less debugger trap, so allowing it is fairly harmless. 729 */ 730 if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 731#ifdef DEBUG 732 printf("sigreturn: eflags = 0x%x\n", eflags); 733#endif 734 return(EINVAL); 735 } 736 737 /* 738 * Don't allow users to load a valid privileged %cs. Let the 739 * hardware check for invalid selectors, excess privilege in 740 * other selectors, invalid %eip's and invalid %esp's. 741 */ 742#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 743 if (!CS_SECURE(scp->sc_cs)) { 744#ifdef DEBUG 745 printf("sigreturn: cs = 0x%x\n", scp->sc_cs); 746#endif 747 trapsignal(p, SIGBUS, T_PROTFLT); 748 return(EINVAL); 749 } 750 regs->tf_ds = scp->sc_ds; 751 regs->tf_es = scp->sc_es; 752#ifdef VM86 753 } 754#endif 755 756 /* restore scratch registers */ 757 regs->tf_eax = scp->sc_eax; 758 regs->tf_ebx = scp->sc_ebx; 759 regs->tf_ecx = scp->sc_ecx; 760 regs->tf_edx = scp->sc_edx; 761 regs->tf_esi = scp->sc_esi; 762 regs->tf_edi = scp->sc_edi; 763 regs->tf_cs = scp->sc_cs; 764 regs->tf_ss = scp->sc_ss; 765 regs->tf_isp = scp->sc_isp; 766 767 if (useracc((caddr_t)scp, sizeof (*scp), B_WRITE) == 0) 768 return(EINVAL); 769 770 if (scp->sc_onstack & 01) 771 p->p_sigacts->ps_sigstk.ss_flags |= SS_ONSTACK; 772 else 773 p->p_sigacts->ps_sigstk.ss_flags &= ~SS_ONSTACK; 774 p->p_sigmask = scp->sc_mask & ~sigcantmask; 775 regs->tf_ebp = scp->sc_fp; 776 regs->tf_esp = scp->sc_sp; 777 regs->tf_eip = scp->sc_pc; 778 regs->tf_eflags = eflags; 779 return(EJUSTRETURN); 780} 781 782/* 783 * Machine dependent boot() routine 784 * 785 * I haven't seen anything to put here yet 786 * Possibly some stuff might be grafted back here from boot() 787 */ 788void 789cpu_boot(int howto) 790{ 791} 792 793/* 794 * Shutdown the CPU as much as possible 795 */ 796void 797cpu_halt(void) 798{ 799 for (;;) 800 __asm__ ("hlt"); 801} 802 803/* 804 * Clear registers on exec 805 */ 806void 807setregs(p, entry, stack) 808 struct proc *p; 809 u_long entry; 810 u_long stack; 811{ 812 struct trapframe *regs = p->p_md.md_regs; 813 struct pcb *pcb = &p->p_addr->u_pcb; 814 815#ifdef USER_LDT 816 /* was i386_user_cleanup() in NetBSD */ 817 if (pcb->pcb_ldt) { 818 if (pcb == curpcb) { 819 lldt(_default_ldt); 820 currentldt = _default_ldt; 821 } 822 kmem_free(kernel_map, (vm_offset_t)pcb->pcb_ldt, 823 pcb->pcb_ldt_len * sizeof(union descriptor)); 824 pcb->pcb_ldt_len = (int)pcb->pcb_ldt = 0; 825 } 826#endif 827 828 bzero((char *)regs, sizeof(struct trapframe)); 829 regs->tf_eip = entry; 830 regs->tf_esp = stack; 831 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T); 832 regs->tf_ss = _udatasel; 833 regs->tf_ds = _udatasel; 834 regs->tf_es = _udatasel; 835 regs->tf_cs = _ucodesel; 836 837 /* reset %fs and %gs as well */ 838 pcb->pcb_fs = _udatasel; 839 pcb->pcb_gs = _udatasel; 840 if (pcb == curpcb) { 841 __asm("movw %w0,%%fs" : : "r" (_udatasel)); 842 __asm("movw %w0,%%gs" : : "r" (_udatasel)); 843 } 844 845 /* 846 * Initialize the math emulator (if any) for the current process. 847 * Actually, just clear the bit that says that the emulator has 848 * been initialized. Initialization is delayed until the process 849 * traps to the emulator (if it is done at all) mainly because 850 * emulators don't provide an entry point for initialization. 851 */ 852 p->p_addr->u_pcb.pcb_flags &= ~FP_SOFTFP; 853 854 /* 855 * Arrange to trap the next npx or `fwait' instruction (see npx.c 856 * for why fwait must be trapped at least if there is an npx or an 857 * emulator). This is mainly to handle the case where npx0 is not 858 * configured, since the npx routines normally set up the trap 859 * otherwise. It should be done only at boot time, but doing it 860 * here allows modifying `npx_exists' for testing the emulator on 861 * systems with an npx. 862 */ 863 load_cr0(rcr0() | CR0_MP | CR0_TS); 864 865#if NNPX > 0 866 /* Initialize the npx (if any) for the current process. */ 867 npxinit(__INITIAL_NPXCW__); 868#endif 869 870 /* 871 * XXX - Linux emulator 872 * Make sure sure edx is 0x0 on entry. Linux binaries depend 873 * on it. 874 */ 875 p->p_retval[1] = 0; 876} 877 878static int 879sysctl_machdep_adjkerntz SYSCTL_HANDLER_ARGS 880{ 881 int error; 882 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 883 req); 884 if (!error && req->newptr) 885 resettodr(); 886 return (error); 887} 888 889SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 890 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 891 892SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, 893 CTLFLAG_RW, &disable_rtc_set, 0, ""); 894 895SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo, 896 CTLFLAG_RD, &bootinfo, bootinfo, ""); 897 898SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock, 899 CTLFLAG_RW, &wall_cmos_clock, 0, ""); 900 901/* 902 * Initialize 386 and configure to run kernel 903 */ 904 905/* 906 * Initialize segments & interrupt table 907 */ 908 909int _default_ldt; 910#ifdef SMP 911union descriptor gdt[NGDT + NCPU]; /* global descriptor table */ 912#else 913union descriptor gdt[NGDT]; /* global descriptor table */ 914#endif 915struct gate_descriptor idt[NIDT]; /* interrupt descriptor table */ 916union descriptor ldt[NLDT]; /* local descriptor table */ 917#ifdef SMP 918/* table descriptors - used to load tables by microp */ 919struct region_descriptor r_gdt, r_idt; 920#endif 921 922extern struct i386tss common_tss; /* One tss per cpu */ 923#ifdef VM86 924extern struct segment_descriptor common_tssd; 925extern int private_tss; /* flag indicating private tss */ 926extern u_int my_tr; /* which task register setting */ 927#endif /* VM86 */ 928 929#if defined(I586_CPU) && !defined(NO_F00F_HACK) 930struct gate_descriptor *t_idt; 931extern int has_f00f_bug; 932#endif 933 934static struct i386tss dblfault_tss; 935static char dblfault_stack[PAGE_SIZE]; 936 937extern struct user *proc0paddr; 938 939 940/* software prototypes -- in more palatable form */ 941struct soft_segment_descriptor gdt_segs[ 942#ifdef SMP 943 NGDT + NCPU 944#endif 945 ] = { 946/* GNULL_SEL 0 Null Descriptor */ 947{ 0x0, /* segment base address */ 948 0x0, /* length */ 949 0, /* segment type */ 950 0, /* segment descriptor priority level */ 951 0, /* segment descriptor present */ 952 0, 0, 953 0, /* default 32 vs 16 bit size */ 954 0 /* limit granularity (byte/page units)*/ }, 955/* GCODE_SEL 1 Code Descriptor for kernel */ 956{ 0x0, /* segment base address */ 957 0xfffff, /* length - all address space */ 958 SDT_MEMERA, /* segment type */ 959 0, /* segment descriptor priority level */ 960 1, /* segment descriptor present */ 961 0, 0, 962 1, /* default 32 vs 16 bit size */ 963 1 /* limit granularity (byte/page units)*/ }, 964/* GDATA_SEL 2 Data Descriptor for kernel */ 965{ 0x0, /* segment base address */ 966 0xfffff, /* length - all address space */ 967 SDT_MEMRWA, /* segment type */ 968 0, /* segment descriptor priority level */ 969 1, /* segment descriptor present */ 970 0, 0, 971 1, /* default 32 vs 16 bit size */ 972 1 /* limit granularity (byte/page units)*/ }, 973/* GLDT_SEL 3 LDT Descriptor */ 974{ (int) ldt, /* segment base address */ 975 sizeof(ldt)-1, /* length - all address space */ 976 SDT_SYSLDT, /* segment type */ 977 SEL_UPL, /* segment descriptor priority level */ 978 1, /* segment descriptor present */ 979 0, 0, 980 0, /* unused - default 32 vs 16 bit size */ 981 0 /* limit granularity (byte/page units)*/ }, 982/* GTGATE_SEL 4 Null Descriptor - Placeholder */ 983{ 0x0, /* segment base address */ 984 0x0, /* length - all address space */ 985 0, /* segment type */ 986 0, /* segment descriptor priority level */ 987 0, /* segment descriptor present */ 988 0, 0, 989 0, /* default 32 vs 16 bit size */ 990 0 /* limit granularity (byte/page units)*/ }, 991/* GPANIC_SEL 5 Panic Tss Descriptor */ 992{ (int) &dblfault_tss, /* segment base address */ 993 sizeof(struct i386tss)-1,/* length - all address space */ 994 SDT_SYS386TSS, /* segment type */ 995 0, /* segment descriptor priority level */ 996 1, /* segment descriptor present */ 997 0, 0, 998 0, /* unused - default 32 vs 16 bit size */ 999 0 /* limit granularity (byte/page units)*/ }, 1000/* GPROC0_SEL 6 Proc 0 Tss Descriptor */ 1001{ 1002 (int) &common_tss, /* segment base address */ 1003 sizeof(struct i386tss)-1,/* length - all address space */ 1004 SDT_SYS386TSS, /* segment type */ 1005 0, /* segment descriptor priority level */ 1006 1, /* segment descriptor present */ 1007 0, 0, 1008 0, /* unused - default 32 vs 16 bit size */ 1009 0 /* limit granularity (byte/page units)*/ }, 1010/* GUSERLDT_SEL 7 User LDT Descriptor per process */ 1011{ (int) ldt, /* segment base address */ 1012 (512 * sizeof(union descriptor)-1), /* length */ 1013 SDT_SYSLDT, /* segment type */ 1014 0, /* segment descriptor priority level */ 1015 1, /* segment descriptor present */ 1016 0, 0, 1017 0, /* unused - default 32 vs 16 bit size */ 1018 0 /* limit granularity (byte/page units)*/ }, 1019/* GAPMCODE32_SEL 8 APM BIOS 32-bit interface (32bit Code) */ 1020{ 0, /* segment base address (overwritten by APM) */ 1021 0xfffff, /* length */ 1022 SDT_MEMERA, /* segment type */ 1023 0, /* segment descriptor priority level */ 1024 1, /* segment descriptor present */ 1025 0, 0, 1026 1, /* default 32 vs 16 bit size */ 1027 1 /* limit granularity (byte/page units)*/ }, 1028/* GAPMCODE16_SEL 9 APM BIOS 32-bit interface (16bit Code) */ 1029{ 0, /* segment base address (overwritten by APM) */ 1030 0xfffff, /* length */ 1031 SDT_MEMERA, /* segment type */ 1032 0, /* segment descriptor priority level */ 1033 1, /* segment descriptor present */ 1034 0, 0, 1035 0, /* default 32 vs 16 bit size */ 1036 1 /* limit granularity (byte/page units)*/ }, 1037/* GAPMDATA_SEL 10 APM BIOS 32-bit interface (Data) */ 1038{ 0, /* segment base address (overwritten by APM) */ 1039 0xfffff, /* length */ 1040 SDT_MEMRWA, /* segment type */ 1041 0, /* segment descriptor priority level */ 1042 1, /* segment descriptor present */ 1043 0, 0, 1044 1, /* default 32 vs 16 bit size */ 1045 1 /* limit granularity (byte/page units)*/ }, 1046}; 1047 1048static struct soft_segment_descriptor ldt_segs[] = { 1049 /* Null Descriptor - overwritten by call gate */ 1050{ 0x0, /* segment base address */ 1051 0x0, /* length - all address space */ 1052 0, /* segment type */ 1053 0, /* segment descriptor priority level */ 1054 0, /* segment descriptor present */ 1055 0, 0, 1056 0, /* default 32 vs 16 bit size */ 1057 0 /* limit granularity (byte/page units)*/ }, 1058 /* Null Descriptor - overwritten by call gate */ 1059{ 0x0, /* segment base address */ 1060 0x0, /* length - all address space */ 1061 0, /* segment type */ 1062 0, /* segment descriptor priority level */ 1063 0, /* segment descriptor present */ 1064 0, 0, 1065 0, /* default 32 vs 16 bit size */ 1066 0 /* limit granularity (byte/page units)*/ }, 1067 /* Null Descriptor - overwritten by call gate */ 1068{ 0x0, /* segment base address */ 1069 0x0, /* length - all address space */ 1070 0, /* segment type */ 1071 0, /* segment descriptor priority level */ 1072 0, /* segment descriptor present */ 1073 0, 0, 1074 0, /* default 32 vs 16 bit size */ 1075 0 /* limit granularity (byte/page units)*/ }, 1076 /* Code Descriptor for user */ 1077{ 0x0, /* segment base address */ 1078 0xfffff, /* length - all address space */ 1079 SDT_MEMERA, /* segment type */ 1080 SEL_UPL, /* segment descriptor priority level */ 1081 1, /* segment descriptor present */ 1082 0, 0, 1083 1, /* default 32 vs 16 bit size */ 1084 1 /* limit granularity (byte/page units)*/ }, 1085 /* Null Descriptor - overwritten by call gate */ 1086{ 0x0, /* segment base address */ 1087 0x0, /* length - all address space */ 1088 0, /* segment type */ 1089 0, /* segment descriptor priority level */ 1090 0, /* segment descriptor present */ 1091 0, 0, 1092 0, /* default 32 vs 16 bit size */ 1093 0 /* limit granularity (byte/page units)*/ }, 1094 /* Data Descriptor for user */ 1095{ 0x0, /* segment base address */ 1096 0xfffff, /* length - all address space */ 1097 SDT_MEMRWA, /* segment type */ 1098 SEL_UPL, /* segment descriptor priority level */ 1099 1, /* segment descriptor present */ 1100 0, 0, 1101 1, /* default 32 vs 16 bit size */ 1102 1 /* limit granularity (byte/page units)*/ }, 1103}; 1104 1105void 1106setidt(idx, func, typ, dpl, selec) 1107 int idx; 1108 inthand_t *func; 1109 int typ; 1110 int dpl; 1111 int selec; 1112{ 1113 struct gate_descriptor *ip; 1114 1115#if defined(I586_CPU) && !defined(NO_F00F_HACK) 1116 ip = (t_idt != NULL ? t_idt : idt) + idx; 1117#else 1118 ip = idt + idx; 1119#endif 1120 ip->gd_looffset = (int)func; 1121 ip->gd_selector = selec; 1122 ip->gd_stkcpy = 0; 1123 ip->gd_xx = 0; 1124 ip->gd_type = typ; 1125 ip->gd_dpl = dpl; 1126 ip->gd_p = 1; 1127 ip->gd_hioffset = ((int)func)>>16 ; 1128} 1129 1130#define IDTVEC(name) __CONCAT(X,name) 1131 1132extern inthand_t 1133 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 1134 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 1135 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 1136 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 1137 IDTVEC(syscall), IDTVEC(int0x80_syscall); 1138 1139void 1140sdtossd(sd, ssd) 1141 struct segment_descriptor *sd; 1142 struct soft_segment_descriptor *ssd; 1143{ 1144 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 1145 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 1146 ssd->ssd_type = sd->sd_type; 1147 ssd->ssd_dpl = sd->sd_dpl; 1148 ssd->ssd_p = sd->sd_p; 1149 ssd->ssd_def32 = sd->sd_def32; 1150 ssd->ssd_gran = sd->sd_gran; 1151} 1152 1153void 1154init386(first) 1155 int first; 1156{ 1157 int x; 1158 unsigned biosbasemem, biosextmem; 1159 struct gate_descriptor *gdp; 1160 int gsel_tss; 1161 1162 struct isa_device *idp; 1163#ifndef SMP 1164 /* table descriptors - used to load tables by microp */ 1165 struct region_descriptor r_gdt, r_idt; 1166#endif 1167 int pagesinbase, pagesinext; 1168 vm_offset_t target_page; 1169 int pa_indx, off; 1170 int speculative_mprobe; 1171 1172 /* 1173 * Prevent lowering of the ipl if we call tsleep() early. 1174 */ 1175 safepri = cpl; 1176 1177 proc0.p_addr = proc0paddr; 1178 1179 atdevbase = ISA_HOLE_START + KERNBASE; 1180 1181 /* 1182 * Initialize the console before we print anything out. 1183 */ 1184 cninit(); 1185 1186 /* 1187 * make gdt memory segments, the code segment goes up to end of the 1188 * page with etext in it, the data segment goes to the end of 1189 * the address space 1190 */ 1191 /* 1192 * XXX text protection is temporarily (?) disabled. The limit was 1193 * i386_btop(round_page(etext)) - 1. 1194 */ 1195 gdt_segs[GCODE_SEL].ssd_limit = i386_btop(0) - 1; 1196 gdt_segs[GDATA_SEL].ssd_limit = i386_btop(0) - 1; 1197#ifdef BDE_DEBUGGER 1198#define NGDT1 8 /* avoid overwriting db entries with APM ones */ 1199#else 1200#define NGDT1 (sizeof gdt_segs / sizeof gdt_segs[0]) 1201#endif 1202 for (x = 0; x < NGDT1; x++) 1203 ssdtosd(&gdt_segs[x], &gdt[x].sd); 1204#ifdef VM86 1205 common_tssd = gdt[GPROC0_SEL].sd; 1206#endif /* VM86 */ 1207 1208#ifdef SMP 1209 /* 1210 * Spin these up now. init_secondary() grabs them. We could use 1211 * #for(x,y,z) / #endfor cpp directives if they existed. 1212 */ 1213 for (x = 0; x < NCPU; x++) { 1214 gdt_segs[NGDT + x] = gdt_segs[GPROC0_SEL]; 1215 ssdtosd(&gdt_segs[NGDT + x], &gdt[NGDT + x].sd); 1216 } 1217#endif 1218 1219 /* make ldt memory segments */ 1220 /* 1221 * The data segment limit must not cover the user area because we 1222 * don't want the user area to be writable in copyout() etc. (page 1223 * level protection is lost in kernel mode on 386's). Also, we 1224 * don't want the user area to be writable directly (page level 1225 * protection of the user area is not available on 486's with 1226 * CR0_WP set, because there is no user-read/kernel-write mode). 1227 * 1228 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it 1229 * should be spelled ...MAX_USER... 1230 */ 1231#define VM_END_USER_RW_ADDRESS VM_MAXUSER_ADDRESS 1232 /* 1233 * The code segment limit has to cover the user area until we move 1234 * the signal trampoline out of the user area. This is safe because 1235 * the code segment cannot be written to directly. 1236 */ 1237#define VM_END_USER_R_ADDRESS (VM_END_USER_RW_ADDRESS + UPAGES * PAGE_SIZE) 1238 ldt_segs[LUCODE_SEL].ssd_limit = i386_btop(VM_END_USER_R_ADDRESS) - 1; 1239 ldt_segs[LUDATA_SEL].ssd_limit = i386_btop(VM_END_USER_RW_ADDRESS) - 1; 1240 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++) 1241 ssdtosd(&ldt_segs[x], &ldt[x].sd); 1242 1243 /* exceptions */ 1244 for (x = 0; x < NIDT; x++) 1245 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1246 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1247 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1248 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1249 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1250 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1251 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1252 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1253 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1254 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL)); 1255 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1256 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1257 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1258 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1259 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1260 setidt(14, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1261 setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1262 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1263 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1264 setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1265 setidt(0x80, &IDTVEC(int0x80_syscall), 1266 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1267 1268#include "isa.h" 1269#if NISA >0 1270 isa_defaultirq(); 1271#endif 1272 rand_initialize(); 1273 1274 r_gdt.rd_limit = sizeof(gdt) - 1; 1275 r_gdt.rd_base = (int) gdt; 1276 lgdt(&r_gdt); 1277 1278 r_idt.rd_limit = sizeof(idt) - 1; 1279 r_idt.rd_base = (int) idt; 1280 lidt(&r_idt); 1281 1282 _default_ldt = GSEL(GLDT_SEL, SEL_KPL); 1283 lldt(_default_ldt); 1284#ifdef USER_LDT 1285 currentldt = _default_ldt; 1286#endif 1287 1288#ifdef DDB 1289 kdb_init(); 1290 if (boothowto & RB_KDB) 1291 Debugger("Boot flags requested debugger"); 1292#endif 1293 1294 finishidentcpu(); /* Final stage of CPU initialization */ 1295 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1296 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1297 initializecpu(); /* Initialize CPU registers */ 1298 1299 /* make an initial tss so cpu can get interrupt stack on syscall! */ 1300#ifdef VM86 1301 common_tss.tss_esp0 = (int) proc0.p_addr + UPAGES*PAGE_SIZE - 16; 1302#else 1303 common_tss.tss_esp0 = (int) proc0.p_addr + UPAGES*PAGE_SIZE; 1304#endif /* VM86 */ 1305 common_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ; 1306 common_tss.tss_ioopt = (sizeof common_tss) << 16; 1307 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 1308 ltr(gsel_tss); 1309#ifdef VM86 1310 private_tss = 0; 1311 my_tr = GPROC0_SEL; 1312#endif 1313 1314 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 = 1315 dblfault_tss.tss_esp2 = (int) &dblfault_stack[sizeof(dblfault_stack)]; 1316 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 = 1317 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL); 1318 dblfault_tss.tss_cr3 = (int)IdlePTD; 1319 dblfault_tss.tss_eip = (int) dblfault_handler; 1320 dblfault_tss.tss_eflags = PSL_KERNEL; 1321 dblfault_tss.tss_ds = dblfault_tss.tss_es = dblfault_tss.tss_fs = 1322 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL); 1323 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL); 1324 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL); 1325 1326#ifdef VM86 1327 initial_bioscalls(&biosbasemem, &biosextmem); 1328#else 1329 1330 /* Use BIOS values stored in RTC CMOS RAM, since probing 1331 * breaks certain 386 AT relics. 1332 */ 1333 biosbasemem = rtcin(RTC_BASELO)+ (rtcin(RTC_BASEHI)<<8); 1334 biosextmem = rtcin(RTC_EXTLO)+ (rtcin(RTC_EXTHI)<<8); 1335#endif 1336 1337 /* 1338 * If BIOS tells us that it has more than 640k in the basemem, 1339 * don't believe it - set it to 640k. 1340 */ 1341 if (biosbasemem > 640) { 1342 printf("Preposterous RTC basemem of %uK, truncating to 640K\n", 1343 biosbasemem); 1344 biosbasemem = 640; 1345 } 1346 if (bootinfo.bi_memsizes_valid && bootinfo.bi_basemem > 640) { 1347 printf("Preposterous BIOS basemem of %uK, truncating to 640K\n", 1348 bootinfo.bi_basemem); 1349 bootinfo.bi_basemem = 640; 1350 } 1351 1352 /* 1353 * Warn if the official BIOS interface disagrees with the RTC 1354 * interface used above about the amount of base memory or the 1355 * amount of extended memory. Prefer the BIOS value for the base 1356 * memory. This is necessary for machines that `steal' base 1357 * memory for use as BIOS memory, at least if we are going to use 1358 * the BIOS for apm. Prefer the RTC value for extended memory. 1359 * Eventually the hackish interface shouldn't even be looked at. 1360 */ 1361 if (bootinfo.bi_memsizes_valid) { 1362 if (bootinfo.bi_basemem != biosbasemem) { 1363 vm_offset_t pa; 1364 1365 printf( 1366 "BIOS basemem (%uK) != RTC basemem (%uK), setting to BIOS value\n", 1367 bootinfo.bi_basemem, biosbasemem); 1368 biosbasemem = bootinfo.bi_basemem; 1369 1370 /* 1371 * XXX if biosbasemem is now < 640, there is `hole' 1372 * between the end of base memory and the start of 1373 * ISA memory. The hole may be empty or it may 1374 * contain BIOS code or data. Map it read/write so 1375 * that the BIOS can write to it. (Memory from 0 to 1376 * the physical end of the kernel is mapped read-only 1377 * to begin with and then parts of it are remapped. 1378 * The parts that aren't remapped form holes that 1379 * remain read-only and are unused by the kernel. 1380 * The base memory area is below the physical end of 1381 * the kernel and right now forms a read-only hole. 1382 * The part of it from PAGE_SIZE to 1383 * (trunc_page(biosbasemem * 1024) - 1) will be 1384 * remapped and used by the kernel later.) 1385 * 1386 * This code is similar to the code used in 1387 * pmap_mapdev, but since no memory needs to be 1388 * allocated we simply change the mapping. 1389 */ 1390 for (pa = trunc_page(biosbasemem * 1024); 1391 pa < ISA_HOLE_START; pa += PAGE_SIZE) { 1392 unsigned *pte; 1393 1394 pte = (unsigned *)vtopte(pa + KERNBASE); 1395 *pte = pa | PG_RW | PG_V; 1396 } 1397 } 1398 if (bootinfo.bi_extmem != biosextmem) 1399 printf("BIOS extmem (%uK) != RTC extmem (%uK)\n", 1400 bootinfo.bi_extmem, biosextmem); 1401 } 1402 1403#ifdef SMP 1404 /* make hole for AP bootstrap code */ 1405 pagesinbase = mp_bootaddress(biosbasemem) / PAGE_SIZE; 1406#else 1407 pagesinbase = biosbasemem * 1024 / PAGE_SIZE; 1408#endif 1409 1410 pagesinext = biosextmem * 1024 / PAGE_SIZE; 1411 1412 /* 1413 * Special hack for chipsets that still remap the 384k hole when 1414 * there's 16MB of memory - this really confuses people that 1415 * are trying to use bus mastering ISA controllers with the 1416 * "16MB limit"; they only have 16MB, but the remapping puts 1417 * them beyond the limit. 1418 */ 1419 /* 1420 * If extended memory is between 15-16MB (16-17MB phys address range), 1421 * chop it to 15MB. 1422 */ 1423 if ((pagesinext > 3840) && (pagesinext < 4096)) 1424 pagesinext = 3840; 1425 1426 /* 1427 * Maxmem isn't the "maximum memory", it's one larger than the 1428 * highest page of the physical address space. It should be 1429 * called something like "Maxphyspage". 1430 */ 1431 Maxmem = pagesinext + 0x100000/PAGE_SIZE; 1432 /* 1433 * Indicate that we wish to do a speculative search for memory beyond 1434 * the end of the reported size if the indicated amount is 64MB (0x4000 1435 * pages) - which is the largest amount that the BIOS/bootblocks can 1436 * currently report. If a specific amount of memory is indicated via 1437 * the MAXMEM option or the npx0 "msize", then don't do the speculative 1438 * memory probe. 1439 */ 1440 if (Maxmem >= 0x4000) 1441 speculative_mprobe = TRUE; 1442 else 1443 speculative_mprobe = FALSE; 1444 1445#ifdef MAXMEM 1446 Maxmem = MAXMEM/4; 1447 speculative_mprobe = FALSE; 1448#endif 1449 1450#if NNPX > 0 1451 idp = find_isadev(isa_devtab_null, &npxdriver, 0); 1452 if (idp != NULL && idp->id_msize != 0) { 1453 Maxmem = idp->id_msize / 4; 1454 speculative_mprobe = FALSE; 1455 } 1456#endif 1457 1458#ifdef SMP 1459 /* look for the MP hardware - needed for apic addresses */ 1460 mp_probe(); 1461#endif 1462 1463 /* call pmap initialization to make new kernel address space */ 1464 pmap_bootstrap (first, 0); 1465 1466 /* 1467 * Size up each available chunk of physical memory. 1468 */ 1469 1470 /* 1471 * We currently don't bother testing base memory. 1472 * XXX ...but we probably should. 1473 */ 1474 pa_indx = 0; 1475 if (pagesinbase > 1) { 1476 phys_avail[pa_indx++] = PAGE_SIZE; /* skip first page of memory */ 1477 phys_avail[pa_indx] = ptoa(pagesinbase);/* memory up to the ISA hole */ 1478 physmem = pagesinbase - 1; 1479 } else { 1480 /* point at first chunk end */ 1481 pa_indx++; 1482 } 1483 1484 for (target_page = avail_start; target_page < ptoa(Maxmem); target_page += PAGE_SIZE) { 1485 int tmp, page_bad; 1486 1487 page_bad = FALSE; 1488 1489 /* 1490 * map page into kernel: valid, read/write, non-cacheable 1491 */ 1492 *(int *)CMAP1 = PG_V | PG_RW | PG_N | target_page; 1493 invltlb(); 1494 1495 tmp = *(int *)CADDR1; 1496 /* 1497 * Test for alternating 1's and 0's 1498 */ 1499 *(volatile int *)CADDR1 = 0xaaaaaaaa; 1500 if (*(volatile int *)CADDR1 != 0xaaaaaaaa) { 1501 page_bad = TRUE; 1502 } 1503 /* 1504 * Test for alternating 0's and 1's 1505 */ 1506 *(volatile int *)CADDR1 = 0x55555555; 1507 if (*(volatile int *)CADDR1 != 0x55555555) { 1508 page_bad = TRUE; 1509 } 1510 /* 1511 * Test for all 1's 1512 */ 1513 *(volatile int *)CADDR1 = 0xffffffff; 1514 if (*(volatile int *)CADDR1 != 0xffffffff) { 1515 page_bad = TRUE; 1516 } 1517 /* 1518 * Test for all 0's 1519 */ 1520 *(volatile int *)CADDR1 = 0x0; 1521 if (*(volatile int *)CADDR1 != 0x0) { 1522 /* 1523 * test of page failed 1524 */ 1525 page_bad = TRUE; 1526 } 1527 /* 1528 * Restore original value. 1529 */ 1530 *(int *)CADDR1 = tmp; 1531 1532 /* 1533 * Adjust array of valid/good pages. 1534 */ 1535 if (page_bad == FALSE) { 1536 /* 1537 * If this good page is a continuation of the 1538 * previous set of good pages, then just increase 1539 * the end pointer. Otherwise start a new chunk. 1540 * Note that "end" points one higher than end, 1541 * making the range >= start and < end. 1542 * If we're also doing a speculative memory 1543 * test and we at or past the end, bump up Maxmem 1544 * so that we keep going. The first bad page 1545 * will terminate the loop. 1546 */ 1547 if (phys_avail[pa_indx] == target_page) { 1548 phys_avail[pa_indx] += PAGE_SIZE; 1549 if (speculative_mprobe == TRUE && 1550 phys_avail[pa_indx] >= (64*1024*1024)) 1551 Maxmem++; 1552 } else { 1553 pa_indx++; 1554 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 1555 printf("Too many holes in the physical address space, giving up\n"); 1556 pa_indx--; 1557 break; 1558 } 1559 phys_avail[pa_indx++] = target_page; /* start */ 1560 phys_avail[pa_indx] = target_page + PAGE_SIZE; /* end */ 1561 } 1562 physmem++; 1563 } 1564 } 1565 1566 *(int *)CMAP1 = 0; 1567 invltlb(); 1568 1569 /* 1570 * XXX 1571 * The last chunk must contain at least one page plus the message 1572 * buffer to avoid complicating other code (message buffer address 1573 * calculation, etc.). 1574 */ 1575 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 1576 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) { 1577 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 1578 phys_avail[pa_indx--] = 0; 1579 phys_avail[pa_indx--] = 0; 1580 } 1581 1582 Maxmem = atop(phys_avail[pa_indx]); 1583 1584 /* Trim off space for the message buffer. */ 1585 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE); 1586 1587 avail_end = phys_avail[pa_indx]; 1588 1589 /* now running on new page tables, configured,and u/iom is accessible */ 1590 1591 /* Map the message buffer. */ 1592 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE) 1593 pmap_enter(kernel_pmap, (vm_offset_t)msgbufp + off, 1594 avail_end + off, VM_PROT_ALL, TRUE); 1595 1596 msgbufinit(msgbufp, MSGBUF_SIZE); 1597 1598 /* make a call gate to reenter kernel with */ 1599 gdp = &ldt[LSYS5CALLS_SEL].gd; 1600 1601 x = (int) &IDTVEC(syscall); 1602 gdp->gd_looffset = x++; 1603 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL); 1604 gdp->gd_stkcpy = 1; 1605 gdp->gd_type = SDT_SYS386CGT; 1606 gdp->gd_dpl = SEL_UPL; 1607 gdp->gd_p = 1; 1608 gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16; 1609 1610 /* XXX does this work? */ 1611 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL]; 1612 ldt[LSOL26CALLS_SEL] = ldt[LSYS5CALLS_SEL]; 1613 1614 /* transfer to user mode */ 1615 1616 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL); 1617 _udatasel = LSEL(LUDATA_SEL, SEL_UPL); 1618 1619 /* setup proc 0's pcb */ 1620 proc0.p_addr->u_pcb.pcb_flags = 0; 1621 proc0.p_addr->u_pcb.pcb_cr3 = (int)IdlePTD; 1622#ifdef SMP 1623 proc0.p_addr->u_pcb.pcb_mpnest = 1; 1624#endif 1625#ifdef VM86 1626 proc0.p_addr->u_pcb.pcb_ext = 0; 1627#endif 1628 1629 /* Sigh, relocate physical addresses left from bootstrap */ 1630 if (bootinfo.bi_modulep) { 1631 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE; 1632 preload_bootstrap_relocate(KERNBASE); 1633 } 1634 if (bootinfo.bi_envp) 1635 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE; 1636} 1637 1638#if defined(I586_CPU) && !defined(NO_F00F_HACK) 1639static void f00f_hack(void *unused); 1640SYSINIT(f00f_hack, SI_SUB_INTRINSIC, SI_ORDER_FIRST, f00f_hack, NULL); 1641 1642static void 1643f00f_hack(void *unused) { 1644#ifndef SMP 1645 struct region_descriptor r_idt; 1646#endif 1647 vm_offset_t tmp; 1648 1649 if (!has_f00f_bug) 1650 return; 1651 1652 printf("Intel Pentium detected, installing workaround for F00F bug\n"); 1653 1654 r_idt.rd_limit = sizeof(idt) - 1; 1655 1656 tmp = kmem_alloc(kernel_map, PAGE_SIZE * 2); 1657 if (tmp == 0) 1658 panic("kmem_alloc returned 0"); 1659 if (((unsigned int)tmp & (PAGE_SIZE-1)) != 0) 1660 panic("kmem_alloc returned non-page-aligned memory"); 1661 /* Put the first seven entries in the lower page */ 1662 t_idt = (struct gate_descriptor*)(tmp + PAGE_SIZE - (7*8)); 1663 bcopy(idt, t_idt, sizeof(idt)); 1664 r_idt.rd_base = (int)t_idt; 1665 lidt(&r_idt); 1666 if (vm_map_protect(kernel_map, tmp, tmp + PAGE_SIZE, 1667 VM_PROT_READ, FALSE) != KERN_SUCCESS) 1668 panic("vm_map_protect failed"); 1669 return; 1670} 1671#endif /* defined(I586_CPU) && !NO_F00F_HACK */ 1672 1673int 1674ptrace_set_pc(p, addr) 1675 struct proc *p; 1676 unsigned long addr; 1677{ 1678 p->p_md.md_regs->tf_eip = addr; 1679 return (0); 1680} 1681 1682int 1683ptrace_single_step(p) 1684 struct proc *p; 1685{ 1686 p->p_md.md_regs->tf_eflags |= PSL_T; 1687 return (0); 1688} 1689 1690int ptrace_read_u_check(p, addr, len) 1691 struct proc *p; 1692 vm_offset_t addr; 1693 size_t len; 1694{ 1695 vm_offset_t gap; 1696 1697 if ((vm_offset_t) (addr + len) < addr) 1698 return EPERM; 1699 if ((vm_offset_t) (addr + len) <= sizeof(struct user)) 1700 return 0; 1701 1702 gap = (char *) p->p_md.md_regs - (char *) p->p_addr; 1703 1704 if ((vm_offset_t) addr < gap) 1705 return EPERM; 1706 if ((vm_offset_t) (addr + len) <= 1707 (vm_offset_t) (gap + sizeof(struct trapframe))) 1708 return 0; 1709 return EPERM; 1710} 1711 1712int ptrace_write_u(p, off, data) 1713 struct proc *p; 1714 vm_offset_t off; 1715 long data; 1716{ 1717 struct trapframe frame_copy; 1718 vm_offset_t min; 1719 struct trapframe *tp; 1720 1721 /* 1722 * Privileged kernel state is scattered all over the user area. 1723 * Only allow write access to parts of regs and to fpregs. 1724 */ 1725 min = (char *)p->p_md.md_regs - (char *)p->p_addr; 1726 if (off >= min && off <= min + sizeof(struct trapframe) - sizeof(int)) { 1727 tp = p->p_md.md_regs; 1728 frame_copy = *tp; 1729 *(int *)((char *)&frame_copy + (off - min)) = data; 1730 if (!EFLAGS_SECURE(frame_copy.tf_eflags, tp->tf_eflags) || 1731 !CS_SECURE(frame_copy.tf_cs)) 1732 return (EINVAL); 1733 *(int*)((char *)p->p_addr + off) = data; 1734 return (0); 1735 } 1736 min = offsetof(struct user, u_pcb) + offsetof(struct pcb, pcb_savefpu); 1737 if (off >= min && off <= min + sizeof(struct save87) - sizeof(int)) { 1738 *(int*)((char *)p->p_addr + off) = data; 1739 return (0); 1740 } 1741 return (EFAULT); 1742} 1743 1744int 1745fill_regs(p, regs) 1746 struct proc *p; 1747 struct reg *regs; 1748{ 1749 struct pcb *pcb; 1750 struct trapframe *tp; 1751 1752 tp = p->p_md.md_regs; 1753 regs->r_es = tp->tf_es; 1754 regs->r_ds = tp->tf_ds; 1755 regs->r_edi = tp->tf_edi; 1756 regs->r_esi = tp->tf_esi; 1757 regs->r_ebp = tp->tf_ebp; 1758 regs->r_ebx = tp->tf_ebx; 1759 regs->r_edx = tp->tf_edx; 1760 regs->r_ecx = tp->tf_ecx; 1761 regs->r_eax = tp->tf_eax; 1762 regs->r_eip = tp->tf_eip; 1763 regs->r_cs = tp->tf_cs; 1764 regs->r_eflags = tp->tf_eflags; 1765 regs->r_esp = tp->tf_esp; 1766 regs->r_ss = tp->tf_ss; 1767 pcb = &p->p_addr->u_pcb; 1768 regs->r_fs = pcb->pcb_fs; 1769 regs->r_gs = pcb->pcb_gs; 1770 return (0); 1771} 1772 1773int 1774set_regs(p, regs) 1775 struct proc *p; 1776 struct reg *regs; 1777{ 1778 struct pcb *pcb; 1779 struct trapframe *tp; 1780 1781 tp = p->p_md.md_regs; 1782 if (!EFLAGS_SECURE(regs->r_eflags, tp->tf_eflags) || 1783 !CS_SECURE(regs->r_cs)) 1784 return (EINVAL); 1785 tp->tf_es = regs->r_es; 1786 tp->tf_ds = regs->r_ds; 1787 tp->tf_edi = regs->r_edi; 1788 tp->tf_esi = regs->r_esi; 1789 tp->tf_ebp = regs->r_ebp; 1790 tp->tf_ebx = regs->r_ebx; 1791 tp->tf_edx = regs->r_edx; 1792 tp->tf_ecx = regs->r_ecx; 1793 tp->tf_eax = regs->r_eax; 1794 tp->tf_eip = regs->r_eip; 1795 tp->tf_cs = regs->r_cs; 1796 tp->tf_eflags = regs->r_eflags; 1797 tp->tf_esp = regs->r_esp; 1798 tp->tf_ss = regs->r_ss; 1799 pcb = &p->p_addr->u_pcb; 1800 pcb->pcb_fs = regs->r_fs; 1801 pcb->pcb_gs = regs->r_gs; 1802 return (0); 1803} 1804 1805int 1806fill_fpregs(p, fpregs) 1807 struct proc *p; 1808 struct fpreg *fpregs; 1809{ 1810 bcopy(&p->p_addr->u_pcb.pcb_savefpu, fpregs, sizeof *fpregs); 1811 return (0); 1812} 1813 1814int 1815set_fpregs(p, fpregs) 1816 struct proc *p; 1817 struct fpreg *fpregs; 1818{ 1819 bcopy(fpregs, &p->p_addr->u_pcb.pcb_savefpu, sizeof *fpregs); 1820 return (0); 1821} 1822 1823#ifndef DDB 1824void 1825Debugger(const char *msg) 1826{ 1827 printf("Debugger(\"%s\") called.\n", msg); 1828} 1829#endif /* no DDB */ 1830 1831#include <sys/disklabel.h> 1832 1833/* 1834 * Determine the size of the transfer, and make sure it is 1835 * within the boundaries of the partition. Adjust transfer 1836 * if needed, and signal errors or early completion. 1837 */ 1838int 1839bounds_check_with_label(struct buf *bp, struct disklabel *lp, int wlabel) 1840{ 1841 struct partition *p = lp->d_partitions + dkpart(bp->b_dev); 1842 int labelsect = lp->d_partitions[0].p_offset; 1843 int maxsz = p->p_size, 1844 sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT; 1845 1846 /* overwriting disk label ? */ 1847 /* XXX should also protect bootstrap in first 8K */ 1848 if (bp->b_blkno + p->p_offset <= LABELSECTOR + labelsect && 1849#if LABELSECTOR != 0 1850 bp->b_blkno + p->p_offset + sz > LABELSECTOR + labelsect && 1851#endif 1852 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 1853 bp->b_error = EROFS; 1854 goto bad; 1855 } 1856 1857#if defined(DOSBBSECTOR) && defined(notyet) 1858 /* overwriting master boot record? */ 1859 if (bp->b_blkno + p->p_offset <= DOSBBSECTOR && 1860 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 1861 bp->b_error = EROFS; 1862 goto bad; 1863 } 1864#endif 1865 1866 /* beyond partition? */ 1867 if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz) { 1868 /* if exactly at end of disk, return an EOF */ 1869 if (bp->b_blkno == maxsz) { 1870 bp->b_resid = bp->b_bcount; 1871 return(0); 1872 } 1873 /* or truncate if part of it fits */ 1874 sz = maxsz - bp->b_blkno; 1875 if (sz <= 0) { 1876 bp->b_error = EINVAL; 1877 goto bad; 1878 } 1879 bp->b_bcount = sz << DEV_BSHIFT; 1880 } 1881 1882 bp->b_pblkno = bp->b_blkno + p->p_offset; 1883 return(1); 1884 1885bad: 1886 bp->b_flags |= B_ERROR; 1887 return(-1); 1888} 1889 1890#ifdef DDB 1891 1892/* 1893 * Provide inb() and outb() as functions. They are normally only 1894 * available as macros calling inlined functions, thus cannot be 1895 * called inside DDB. 1896 * 1897 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined. 1898 */ 1899 1900#undef inb 1901#undef outb 1902 1903/* silence compiler warnings */ 1904u_char inb(u_int); 1905void outb(u_int, u_char); 1906 1907u_char 1908inb(u_int port) 1909{ 1910 u_char data; 1911 /* 1912 * We use %%dx and not %1 here because i/o is done at %dx and not at 1913 * %edx, while gcc generates inferior code (movw instead of movl) 1914 * if we tell it to load (u_short) port. 1915 */ 1916 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 1917 return (data); 1918} 1919 1920void 1921outb(u_int port, u_char data) 1922{ 1923 u_char al; 1924 /* 1925 * Use an unnecessary assignment to help gcc's register allocator. 1926 * This make a large difference for gcc-1.40 and a tiny difference 1927 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for 1928 * best results. gcc-2.6.0 can't handle this. 1929 */ 1930 al = data; 1931 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 1932} 1933 1934#endif /* DDB */ 1935