machdep.c revision 45270
1260684Skaiw/*- 2260684Skaiw * Copyright (c) 1992 Terrence R. Lambert. 3260684Skaiw * Copyright (c) 1982, 1987, 1990 The Regents of the University of California. 4260684Skaiw * All rights reserved. 5260684Skaiw * 6260684Skaiw * This code is derived from software contributed to Berkeley by 7260684Skaiw * William Jolitz. 8260684Skaiw * 9260684Skaiw * Redistribution and use in source and binary forms, with or without 10260684Skaiw * modification, are permitted provided that the following conditions 11260684Skaiw * are met: 12260684Skaiw * 1. Redistributions of source code must retain the above copyright 13260684Skaiw * notice, this list of conditions and the following disclaimer. 14260684Skaiw * 2. Redistributions in binary form must reproduce the above copyright 15260684Skaiw * notice, this list of conditions and the following disclaimer in the 16260684Skaiw * documentation and/or other materials provided with the distribution. 17260684Skaiw * 3. All advertising materials mentioning features or use of this software 18260684Skaiw * must display the following acknowledgement: 19260684Skaiw * This product includes software developed by the University of 20260684Skaiw * California, Berkeley and its contributors. 21260684Skaiw * 4. Neither the name of the University nor the names of its contributors 22260684Skaiw * may be used to endorse or promote products derived from this software 23260684Skaiw * without specific prior written permission. 24260684Skaiw * 25260684Skaiw * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26260684Skaiw * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27260684Skaiw * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28260684Skaiw * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29295577Semaste * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30260684Skaiw * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31260684Skaiw * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32260684Skaiw * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33260684Skaiw * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34260684Skaiw * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35260684Skaiw * SUCH DAMAGE. 36260684Skaiw * 37295577Semaste * from: @(#)machdep.c 7.4 (Berkeley) 6/3/91 38260684Skaiw * $Id: machdep.c,v 1.327 1999/03/06 04:46:18 wollman Exp $ 39260684Skaiw */ 40260684Skaiw 41260684Skaiw#include "apm.h" 42260684Skaiw#include "ether.h" 43260684Skaiw#include "npx.h" 44260684Skaiw#include "opt_atalk.h" 45260684Skaiw#include "opt_cpu.h" 46260684Skaiw#include "opt_ddb.h" 47260684Skaiw#include "opt_inet.h" 48295577Semaste#include "opt_ipx.h" 49260684Skaiw#include "opt_maxmem.h" 50260684Skaiw#include "opt_msgbuf.h" 51260684Skaiw#include "opt_perfmon.h" 52260684Skaiw#include "opt_smp.h" 53295577Semaste#include "opt_sysvipc.h" 54260684Skaiw#include "opt_user_ldt.h" 55260684Skaiw#include "opt_userconfig.h" 56260684Skaiw#include "opt_vm86.h" 57260684Skaiw 58260684Skaiw#include <sys/param.h> 59260684Skaiw#include <sys/systm.h> 60260684Skaiw#include <sys/sysproto.h> 61260684Skaiw#include <sys/signalvar.h> 62260684Skaiw#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 callout_init(&callout[i]); 435 callout[i].c_flags = CALLOUT_LOCAL_ALLOC; 436 SLIST_INSERT_HEAD(&callfree, &callout[i], c_links.sle); 437 } 438 439 for (i = 0; i < callwheelsize; i++) { 440 TAILQ_INIT(&callwheel[i]); 441 } 442 443#if defined(USERCONFIG) 444 userconfig(); 445 cninit(); /* the preferred console may have changed */ 446#endif 447 448 printf("avail memory = %u (%uK bytes)\n", ptoa(cnt.v_free_count), 449 ptoa(cnt.v_free_count) / 1024); 450 451 /* 452 * Set up buffers, so they can be used to read disk labels. 453 */ 454 bufinit(); 455 vm_pager_bufferinit(); 456 457#ifdef SMP 458 /* 459 * OK, enough kmem_alloc/malloc state should be up, lets get on with it! 460 */ 461 mp_start(); /* fire up the APs and APICs */ 462 mp_announce(); 463#endif /* SMP */ 464} 465 466#ifdef NETISR 467int 468register_netisr(num, handler) 469 int num; 470 netisr_t *handler; 471{ 472 473 if (num < 0 || num >= (sizeof(netisrs)/sizeof(*netisrs)) ) { 474 printf("register_netisr: bad isr number: %d\n", num); 475 return (EINVAL); 476 } 477 netisrs[num] = handler; 478 return (0); 479} 480 481static void 482setup_netisrs(ls) 483 struct linker_set *ls; 484{ 485 int i; 486 const struct netisrtab *nit; 487 488 for(i = 0; ls->ls_items[i]; i++) { 489 nit = (const struct netisrtab *)ls->ls_items[i]; 490 register_netisr(nit->nit_num, nit->nit_isr); 491 } 492} 493#endif /* NETISR */ 494 495/* 496 * Send an interrupt to process. 497 * 498 * Stack is set up to allow sigcode stored 499 * at top to call routine, followed by kcall 500 * to sigreturn routine below. After sigreturn 501 * resets the signal mask, the stack, and the 502 * frame pointer, it returns to the user 503 * specified pc, psl. 504 */ 505void 506sendsig(catcher, sig, mask, code) 507 sig_t catcher; 508 int sig, mask; 509 u_long code; 510{ 511 register struct proc *p = curproc; 512 register struct trapframe *regs; 513 register struct sigframe *fp; 514 struct sigframe sf; 515 struct sigacts *psp = p->p_sigacts; 516 int oonstack; 517 518 regs = p->p_md.md_regs; 519 oonstack = psp->ps_sigstk.ss_flags & SS_ONSTACK; 520 /* 521 * Allocate and validate space for the signal handler context. 522 */ 523 if ((psp->ps_flags & SAS_ALTSTACK) && !oonstack && 524 (psp->ps_sigonstack & sigmask(sig))) { 525 fp = (struct sigframe *)(psp->ps_sigstk.ss_sp + 526 psp->ps_sigstk.ss_size - sizeof(struct sigframe)); 527 psp->ps_sigstk.ss_flags |= SS_ONSTACK; 528 } else { 529 fp = (struct sigframe *)regs->tf_esp - 1; 530 } 531 532 /* 533 * grow() will return FALSE if the fp will not fit inside the stack 534 * and the stack can not be grown. useracc will return FALSE 535 * if access is denied. 536 */ 537#ifdef VM_STACK 538 if ((grow_stack (p, (int)fp) == FALSE) || 539#else 540 if ((grow(p, (int)fp) == FALSE) || 541#endif 542 (useracc((caddr_t)fp, sizeof(struct sigframe), B_WRITE) == FALSE)) { 543 /* 544 * Process has trashed its stack; give it an illegal 545 * instruction to halt it in its tracks. 546 */ 547 SIGACTION(p, SIGILL) = SIG_DFL; 548 sig = sigmask(SIGILL); 549 p->p_sigignore &= ~sig; 550 p->p_sigcatch &= ~sig; 551 p->p_sigmask &= ~sig; 552 psignal(p, SIGILL); 553 return; 554 } 555 556 /* 557 * Build the argument list for the signal handler. 558 */ 559 if (p->p_sysent->sv_sigtbl) { 560 if (sig < p->p_sysent->sv_sigsize) 561 sig = p->p_sysent->sv_sigtbl[sig]; 562 else 563 sig = p->p_sysent->sv_sigsize + 1; 564 } 565 sf.sf_signum = sig; 566 sf.sf_code = code; 567 sf.sf_scp = &fp->sf_sc; 568 sf.sf_addr = (char *) regs->tf_err; 569 sf.sf_handler = catcher; 570 571 /* save scratch registers */ 572 sf.sf_sc.sc_eax = regs->tf_eax; 573 sf.sf_sc.sc_ebx = regs->tf_ebx; 574 sf.sf_sc.sc_ecx = regs->tf_ecx; 575 sf.sf_sc.sc_edx = regs->tf_edx; 576 sf.sf_sc.sc_esi = regs->tf_esi; 577 sf.sf_sc.sc_edi = regs->tf_edi; 578 sf.sf_sc.sc_cs = regs->tf_cs; 579 sf.sf_sc.sc_ds = regs->tf_ds; 580 sf.sf_sc.sc_ss = regs->tf_ss; 581 sf.sf_sc.sc_es = regs->tf_es; 582 sf.sf_sc.sc_isp = regs->tf_isp; 583 584 /* 585 * Build the signal context to be used by sigreturn. 586 */ 587 sf.sf_sc.sc_onstack = oonstack; 588 sf.sf_sc.sc_mask = mask; 589 sf.sf_sc.sc_sp = regs->tf_esp; 590 sf.sf_sc.sc_fp = regs->tf_ebp; 591 sf.sf_sc.sc_pc = regs->tf_eip; 592 sf.sf_sc.sc_ps = regs->tf_eflags; 593 sf.sf_sc.sc_trapno = regs->tf_trapno; 594 sf.sf_sc.sc_err = regs->tf_err; 595 596#ifdef VM86 597 /* 598 * If we're a vm86 process, we want to save the segment registers. 599 * We also change eflags to be our emulated eflags, not the actual 600 * eflags. 601 */ 602 if (regs->tf_eflags & PSL_VM) { 603 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 604 struct vm86_kernel *vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 605 606 sf.sf_sc.sc_gs = tf->tf_vm86_gs; 607 sf.sf_sc.sc_fs = tf->tf_vm86_fs; 608 sf.sf_sc.sc_es = tf->tf_vm86_es; 609 sf.sf_sc.sc_ds = tf->tf_vm86_ds; 610 611 if (vm86->vm86_has_vme == 0) 612 sf.sf_sc.sc_ps = (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) 613 | (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 614 615 /* 616 * We should never have PSL_T set when returning from vm86 617 * mode. It may be set here if we deliver a signal before 618 * getting to vm86 mode, so turn it off. 619 * 620 * Clear PSL_NT to inhibit T_TSSFLT faults on return from 621 * syscalls made by the signal handler. This just avoids 622 * wasting time for our lazy fixup of such faults. PSL_NT 623 * does nothing in vm86 mode, but vm86 programs can set it 624 * almost legitimately in probes for old cpu types. 625 */ 626 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_T | PSL_VIF | PSL_VIP); 627 } 628#endif /* VM86 */ 629 630 /* 631 * Copy the sigframe out to the user's stack. 632 */ 633 if (copyout(&sf, fp, sizeof(struct sigframe)) != 0) { 634 /* 635 * Something is wrong with the stack pointer. 636 * ...Kill the process. 637 */ 638 sigexit(p, SIGILL); 639 } 640 641 regs->tf_esp = (int)fp; 642 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode); 643 regs->tf_cs = _ucodesel; 644 regs->tf_ds = _udatasel; 645 regs->tf_es = _udatasel; 646 regs->tf_ss = _udatasel; 647} 648 649/* 650 * System call to cleanup state after a signal 651 * has been taken. Reset signal mask and 652 * stack state from context left by sendsig (above). 653 * Return to previous pc and psl as specified by 654 * context left by sendsig. Check carefully to 655 * make sure that the user has not modified the 656 * state to gain improper privileges. 657 */ 658int 659sigreturn(p, uap) 660 struct proc *p; 661 struct sigreturn_args /* { 662 struct sigcontext *sigcntxp; 663 } */ *uap; 664{ 665 register struct sigcontext *scp; 666 register struct sigframe *fp; 667 register struct trapframe *regs = p->p_md.md_regs; 668 int eflags; 669 670 /* 671 * (XXX old comment) regs->tf_esp points to the return address. 672 * The user scp pointer is above that. 673 * The return address is faked in the signal trampoline code 674 * for consistency. 675 */ 676 scp = uap->sigcntxp; 677 fp = (struct sigframe *) 678 ((caddr_t)scp - offsetof(struct sigframe, sf_sc)); 679 680 if (useracc((caddr_t)fp, sizeof (*fp), B_WRITE) == 0) 681 return(EFAULT); 682 683 eflags = scp->sc_ps; 684#ifdef VM86 685 if (eflags & PSL_VM) { 686 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 687 struct vm86_kernel *vm86; 688 689 /* 690 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 691 * set up the vm86 area, and we can't enter vm86 mode. 692 */ 693 if (p->p_addr->u_pcb.pcb_ext == 0) 694 return (EINVAL); 695 vm86 = &p->p_addr->u_pcb.pcb_ext->ext_vm86; 696 if (vm86->vm86_inited == 0) 697 return (EINVAL); 698 699 /* go back to user mode if both flags are set */ 700 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 701 trapsignal(p, SIGBUS, 0); 702 703 if (vm86->vm86_has_vme) { 704 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 705 (eflags & VME_USERCHANGE) | PSL_VM; 706 } else { 707 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 708 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM; 709 } 710 tf->tf_vm86_ds = scp->sc_ds; 711 tf->tf_vm86_es = scp->sc_es; 712 tf->tf_vm86_fs = scp->sc_fs; 713 tf->tf_vm86_gs = scp->sc_gs; 714 tf->tf_ds = _udatasel; 715 tf->tf_es = _udatasel; 716 } else { 717#endif /* VM86 */ 718 /* 719 * Don't allow users to change privileged or reserved flags. 720 */ 721#define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 722 /* 723 * XXX do allow users to change the privileged flag PSL_RF. 724 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 725 * should sometimes set it there too. tf_eflags is kept in 726 * the signal context during signal handling and there is no 727 * other place to remember it, so the PSL_RF bit may be 728 * corrupted by the signal handler without us knowing. 729 * Corruption of the PSL_RF bit at worst causes one more or 730 * one less debugger trap, so allowing it is fairly harmless. 731 */ 732 if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 733#ifdef DEBUG 734 printf("sigreturn: eflags = 0x%x\n", eflags); 735#endif 736 return(EINVAL); 737 } 738 739 /* 740 * Don't allow users to load a valid privileged %cs. Let the 741 * hardware check for invalid selectors, excess privilege in 742 * other selectors, invalid %eip's and invalid %esp's. 743 */ 744#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 745 if (!CS_SECURE(scp->sc_cs)) { 746#ifdef DEBUG 747 printf("sigreturn: cs = 0x%x\n", scp->sc_cs); 748#endif 749 trapsignal(p, SIGBUS, T_PROTFLT); 750 return(EINVAL); 751 } 752 regs->tf_ds = scp->sc_ds; 753 regs->tf_es = scp->sc_es; 754#ifdef VM86 755 } 756#endif 757 758 /* restore scratch registers */ 759 regs->tf_eax = scp->sc_eax; 760 regs->tf_ebx = scp->sc_ebx; 761 regs->tf_ecx = scp->sc_ecx; 762 regs->tf_edx = scp->sc_edx; 763 regs->tf_esi = scp->sc_esi; 764 regs->tf_edi = scp->sc_edi; 765 regs->tf_cs = scp->sc_cs; 766 regs->tf_ss = scp->sc_ss; 767 regs->tf_isp = scp->sc_isp; 768 769 if (useracc((caddr_t)scp, sizeof (*scp), B_WRITE) == 0) 770 return(EINVAL); 771 772 if (scp->sc_onstack & 01) 773 p->p_sigacts->ps_sigstk.ss_flags |= SS_ONSTACK; 774 else 775 p->p_sigacts->ps_sigstk.ss_flags &= ~SS_ONSTACK; 776 p->p_sigmask = scp->sc_mask & ~sigcantmask; 777 regs->tf_ebp = scp->sc_fp; 778 regs->tf_esp = scp->sc_sp; 779 regs->tf_eip = scp->sc_pc; 780 regs->tf_eflags = eflags; 781 return(EJUSTRETURN); 782} 783 784/* 785 * Machine dependent boot() routine 786 * 787 * I haven't seen anything to put here yet 788 * Possibly some stuff might be grafted back here from boot() 789 */ 790void 791cpu_boot(int howto) 792{ 793} 794 795/* 796 * Shutdown the CPU as much as possible 797 */ 798void 799cpu_halt(void) 800{ 801 for (;;) 802 __asm__ ("hlt"); 803} 804 805/* 806 * Clear registers on exec 807 */ 808void 809setregs(p, entry, stack, ps_strings) 810 struct proc *p; 811 u_long entry; 812 u_long stack; 813 u_long ps_strings; 814{ 815 struct trapframe *regs = p->p_md.md_regs; 816 struct pcb *pcb = &p->p_addr->u_pcb; 817 818#ifdef USER_LDT 819 /* was i386_user_cleanup() in NetBSD */ 820 if (pcb->pcb_ldt) { 821 if (pcb == curpcb) { 822 lldt(_default_ldt); 823 currentldt = _default_ldt; 824 } 825 kmem_free(kernel_map, (vm_offset_t)pcb->pcb_ldt, 826 pcb->pcb_ldt_len * sizeof(union descriptor)); 827 pcb->pcb_ldt_len = (int)pcb->pcb_ldt = 0; 828 } 829#endif 830 831 bzero((char *)regs, sizeof(struct trapframe)); 832 regs->tf_eip = entry; 833 regs->tf_esp = stack; 834 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T); 835 regs->tf_ss = _udatasel; 836 regs->tf_ds = _udatasel; 837 regs->tf_es = _udatasel; 838 regs->tf_cs = _ucodesel; 839 840 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */ 841 regs->tf_ebx = ps_strings; 842 843 /* reset %fs and %gs as well */ 844 pcb->pcb_fs = _udatasel; 845 pcb->pcb_gs = _udatasel; 846 if (pcb == curpcb) { 847 __asm("movw %w0,%%fs" : : "r" (_udatasel)); 848 __asm("movw %w0,%%gs" : : "r" (_udatasel)); 849 } 850 851 /* 852 * Initialize the math emulator (if any) for the current process. 853 * Actually, just clear the bit that says that the emulator has 854 * been initialized. Initialization is delayed until the process 855 * traps to the emulator (if it is done at all) mainly because 856 * emulators don't provide an entry point for initialization. 857 */ 858 p->p_addr->u_pcb.pcb_flags &= ~FP_SOFTFP; 859 860 /* 861 * Arrange to trap the next npx or `fwait' instruction (see npx.c 862 * for why fwait must be trapped at least if there is an npx or an 863 * emulator). This is mainly to handle the case where npx0 is not 864 * configured, since the npx routines normally set up the trap 865 * otherwise. It should be done only at boot time, but doing it 866 * here allows modifying `npx_exists' for testing the emulator on 867 * systems with an npx. 868 */ 869 load_cr0(rcr0() | CR0_MP | CR0_TS); 870 871#if NNPX > 0 872 /* Initialize the npx (if any) for the current process. */ 873 npxinit(__INITIAL_NPXCW__); 874#endif 875 876 /* 877 * XXX - Linux emulator 878 * Make sure sure edx is 0x0 on entry. Linux binaries depend 879 * on it. 880 */ 881 p->p_retval[1] = 0; 882} 883 884static int 885sysctl_machdep_adjkerntz SYSCTL_HANDLER_ARGS 886{ 887 int error; 888 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 889 req); 890 if (!error && req->newptr) 891 resettodr(); 892 return (error); 893} 894 895SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 896 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 897 898SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, 899 CTLFLAG_RW, &disable_rtc_set, 0, ""); 900 901SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo, 902 CTLFLAG_RD, &bootinfo, bootinfo, ""); 903 904SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock, 905 CTLFLAG_RW, &wall_cmos_clock, 0, ""); 906 907/* 908 * Initialize 386 and configure to run kernel 909 */ 910 911/* 912 * Initialize segments & interrupt table 913 */ 914 915int _default_ldt; 916#ifdef SMP 917union descriptor gdt[NGDT + NCPU]; /* global descriptor table */ 918#else 919union descriptor gdt[NGDT]; /* global descriptor table */ 920#endif 921struct gate_descriptor idt[NIDT]; /* interrupt descriptor table */ 922union descriptor ldt[NLDT]; /* local descriptor table */ 923#ifdef SMP 924/* table descriptors - used to load tables by microp */ 925struct region_descriptor r_gdt, r_idt; 926#endif 927 928extern struct i386tss common_tss; /* One tss per cpu */ 929#ifdef VM86 930extern struct segment_descriptor common_tssd; 931extern int private_tss; /* flag indicating private tss */ 932extern u_int my_tr; /* which task register setting */ 933#endif /* VM86 */ 934 935#if defined(I586_CPU) && !defined(NO_F00F_HACK) 936struct gate_descriptor *t_idt; 937extern int has_f00f_bug; 938#endif 939 940static struct i386tss dblfault_tss; 941static char dblfault_stack[PAGE_SIZE]; 942 943extern struct user *proc0paddr; 944 945 946/* software prototypes -- in more palatable form */ 947struct soft_segment_descriptor gdt_segs[ 948#ifdef SMP 949 NGDT + NCPU 950#endif 951 ] = { 952/* GNULL_SEL 0 Null Descriptor */ 953{ 0x0, /* segment base address */ 954 0x0, /* length */ 955 0, /* segment type */ 956 0, /* segment descriptor priority level */ 957 0, /* segment descriptor present */ 958 0, 0, 959 0, /* default 32 vs 16 bit size */ 960 0 /* limit granularity (byte/page units)*/ }, 961/* GCODE_SEL 1 Code Descriptor for kernel */ 962{ 0x0, /* segment base address */ 963 0xfffff, /* length - all address space */ 964 SDT_MEMERA, /* segment type */ 965 0, /* segment descriptor priority level */ 966 1, /* segment descriptor present */ 967 0, 0, 968 1, /* default 32 vs 16 bit size */ 969 1 /* limit granularity (byte/page units)*/ }, 970/* GDATA_SEL 2 Data Descriptor for kernel */ 971{ 0x0, /* segment base address */ 972 0xfffff, /* length - all address space */ 973 SDT_MEMRWA, /* segment type */ 974 0, /* segment descriptor priority level */ 975 1, /* segment descriptor present */ 976 0, 0, 977 1, /* default 32 vs 16 bit size */ 978 1 /* limit granularity (byte/page units)*/ }, 979/* GLDT_SEL 3 LDT Descriptor */ 980{ (int) ldt, /* segment base address */ 981 sizeof(ldt)-1, /* length - all address space */ 982 SDT_SYSLDT, /* segment type */ 983 SEL_UPL, /* segment descriptor priority level */ 984 1, /* segment descriptor present */ 985 0, 0, 986 0, /* unused - default 32 vs 16 bit size */ 987 0 /* limit granularity (byte/page units)*/ }, 988/* GTGATE_SEL 4 Null Descriptor - Placeholder */ 989{ 0x0, /* segment base address */ 990 0x0, /* length - all address space */ 991 0, /* segment type */ 992 0, /* segment descriptor priority level */ 993 0, /* segment descriptor present */ 994 0, 0, 995 0, /* default 32 vs 16 bit size */ 996 0 /* limit granularity (byte/page units)*/ }, 997/* GPANIC_SEL 5 Panic Tss Descriptor */ 998{ (int) &dblfault_tss, /* segment base address */ 999 sizeof(struct i386tss)-1,/* length - all address space */ 1000 SDT_SYS386TSS, /* segment type */ 1001 0, /* segment descriptor priority level */ 1002 1, /* segment descriptor present */ 1003 0, 0, 1004 0, /* unused - default 32 vs 16 bit size */ 1005 0 /* limit granularity (byte/page units)*/ }, 1006/* GPROC0_SEL 6 Proc 0 Tss Descriptor */ 1007{ 1008 (int) &common_tss, /* segment base address */ 1009 sizeof(struct i386tss)-1,/* length - all address space */ 1010 SDT_SYS386TSS, /* segment type */ 1011 0, /* segment descriptor priority level */ 1012 1, /* segment descriptor present */ 1013 0, 0, 1014 0, /* unused - default 32 vs 16 bit size */ 1015 0 /* limit granularity (byte/page units)*/ }, 1016/* GUSERLDT_SEL 7 User LDT Descriptor per process */ 1017{ (int) ldt, /* segment base address */ 1018 (512 * sizeof(union descriptor)-1), /* length */ 1019 SDT_SYSLDT, /* segment type */ 1020 0, /* segment descriptor priority level */ 1021 1, /* segment descriptor present */ 1022 0, 0, 1023 0, /* unused - default 32 vs 16 bit size */ 1024 0 /* limit granularity (byte/page units)*/ }, 1025/* GAPMCODE32_SEL 8 APM BIOS 32-bit interface (32bit Code) */ 1026{ 0, /* segment base address (overwritten by APM) */ 1027 0xfffff, /* length */ 1028 SDT_MEMERA, /* segment type */ 1029 0, /* segment descriptor priority level */ 1030 1, /* segment descriptor present */ 1031 0, 0, 1032 1, /* default 32 vs 16 bit size */ 1033 1 /* limit granularity (byte/page units)*/ }, 1034/* GAPMCODE16_SEL 9 APM BIOS 32-bit interface (16bit Code) */ 1035{ 0, /* segment base address (overwritten by APM) */ 1036 0xfffff, /* length */ 1037 SDT_MEMERA, /* segment type */ 1038 0, /* segment descriptor priority level */ 1039 1, /* segment descriptor present */ 1040 0, 0, 1041 0, /* default 32 vs 16 bit size */ 1042 1 /* limit granularity (byte/page units)*/ }, 1043/* GAPMDATA_SEL 10 APM BIOS 32-bit interface (Data) */ 1044{ 0, /* segment base address (overwritten by APM) */ 1045 0xfffff, /* length */ 1046 SDT_MEMRWA, /* segment type */ 1047 0, /* segment descriptor priority level */ 1048 1, /* segment descriptor present */ 1049 0, 0, 1050 1, /* default 32 vs 16 bit size */ 1051 1 /* limit granularity (byte/page units)*/ }, 1052}; 1053 1054static struct soft_segment_descriptor ldt_segs[] = { 1055 /* Null Descriptor - overwritten by call gate */ 1056{ 0x0, /* segment base address */ 1057 0x0, /* length - all address space */ 1058 0, /* segment type */ 1059 0, /* segment descriptor priority level */ 1060 0, /* segment descriptor present */ 1061 0, 0, 1062 0, /* default 32 vs 16 bit size */ 1063 0 /* limit granularity (byte/page units)*/ }, 1064 /* Null Descriptor - overwritten by call gate */ 1065{ 0x0, /* segment base address */ 1066 0x0, /* length - all address space */ 1067 0, /* segment type */ 1068 0, /* segment descriptor priority level */ 1069 0, /* segment descriptor present */ 1070 0, 0, 1071 0, /* default 32 vs 16 bit size */ 1072 0 /* limit granularity (byte/page units)*/ }, 1073 /* Null Descriptor - overwritten by call gate */ 1074{ 0x0, /* segment base address */ 1075 0x0, /* length - all address space */ 1076 0, /* segment type */ 1077 0, /* segment descriptor priority level */ 1078 0, /* segment descriptor present */ 1079 0, 0, 1080 0, /* default 32 vs 16 bit size */ 1081 0 /* limit granularity (byte/page units)*/ }, 1082 /* Code Descriptor for user */ 1083{ 0x0, /* segment base address */ 1084 0xfffff, /* length - all address space */ 1085 SDT_MEMERA, /* segment type */ 1086 SEL_UPL, /* segment descriptor priority level */ 1087 1, /* segment descriptor present */ 1088 0, 0, 1089 1, /* default 32 vs 16 bit size */ 1090 1 /* limit granularity (byte/page units)*/ }, 1091 /* Null Descriptor - overwritten by call gate */ 1092{ 0x0, /* segment base address */ 1093 0x0, /* length - all address space */ 1094 0, /* segment type */ 1095 0, /* segment descriptor priority level */ 1096 0, /* segment descriptor present */ 1097 0, 0, 1098 0, /* default 32 vs 16 bit size */ 1099 0 /* limit granularity (byte/page units)*/ }, 1100 /* Data Descriptor for user */ 1101{ 0x0, /* segment base address */ 1102 0xfffff, /* length - all address space */ 1103 SDT_MEMRWA, /* segment type */ 1104 SEL_UPL, /* segment descriptor priority level */ 1105 1, /* segment descriptor present */ 1106 0, 0, 1107 1, /* default 32 vs 16 bit size */ 1108 1 /* limit granularity (byte/page units)*/ }, 1109}; 1110 1111void 1112setidt(idx, func, typ, dpl, selec) 1113 int idx; 1114 inthand_t *func; 1115 int typ; 1116 int dpl; 1117 int selec; 1118{ 1119 struct gate_descriptor *ip; 1120 1121#if defined(I586_CPU) && !defined(NO_F00F_HACK) 1122 ip = (t_idt != NULL ? t_idt : idt) + idx; 1123#else 1124 ip = idt + idx; 1125#endif 1126 ip->gd_looffset = (int)func; 1127 ip->gd_selector = selec; 1128 ip->gd_stkcpy = 0; 1129 ip->gd_xx = 0; 1130 ip->gd_type = typ; 1131 ip->gd_dpl = dpl; 1132 ip->gd_p = 1; 1133 ip->gd_hioffset = ((int)func)>>16 ; 1134} 1135 1136#define IDTVEC(name) __CONCAT(X,name) 1137 1138extern inthand_t 1139 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 1140 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 1141 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 1142 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 1143 IDTVEC(syscall), IDTVEC(int0x80_syscall); 1144 1145void 1146sdtossd(sd, ssd) 1147 struct segment_descriptor *sd; 1148 struct soft_segment_descriptor *ssd; 1149{ 1150 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 1151 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 1152 ssd->ssd_type = sd->sd_type; 1153 ssd->ssd_dpl = sd->sd_dpl; 1154 ssd->ssd_p = sd->sd_p; 1155 ssd->ssd_def32 = sd->sd_def32; 1156 ssd->ssd_gran = sd->sd_gran; 1157} 1158 1159void 1160init386(first) 1161 int first; 1162{ 1163 int x; 1164 unsigned biosbasemem, biosextmem; 1165 struct gate_descriptor *gdp; 1166 int gsel_tss; 1167 1168 struct isa_device *idp; 1169#ifndef SMP 1170 /* table descriptors - used to load tables by microp */ 1171 struct region_descriptor r_gdt, r_idt; 1172#endif 1173 int pagesinbase, pagesinext; 1174 vm_offset_t target_page; 1175 int pa_indx, off; 1176 int speculative_mprobe; 1177 1178 /* 1179 * Prevent lowering of the ipl if we call tsleep() early. 1180 */ 1181 safepri = cpl; 1182 1183 proc0.p_addr = proc0paddr; 1184 1185 atdevbase = ISA_HOLE_START + KERNBASE; 1186 1187 /* 1188 * Initialize the console before we print anything out. 1189 */ 1190 cninit(); 1191 1192 /* 1193 * make gdt memory segments, the code segment goes up to end of the 1194 * page with etext in it, the data segment goes to the end of 1195 * the address space 1196 */ 1197 /* 1198 * XXX text protection is temporarily (?) disabled. The limit was 1199 * i386_btop(round_page(etext)) - 1. 1200 */ 1201 gdt_segs[GCODE_SEL].ssd_limit = i386_btop(0) - 1; 1202 gdt_segs[GDATA_SEL].ssd_limit = i386_btop(0) - 1; 1203#ifdef BDE_DEBUGGER 1204#define NGDT1 8 /* avoid overwriting db entries with APM ones */ 1205#else 1206#define NGDT1 (sizeof gdt_segs / sizeof gdt_segs[0]) 1207#endif 1208 for (x = 0; x < NGDT1; x++) 1209 ssdtosd(&gdt_segs[x], &gdt[x].sd); 1210#ifdef VM86 1211 common_tssd = gdt[GPROC0_SEL].sd; 1212#endif /* VM86 */ 1213 1214#ifdef SMP 1215 /* 1216 * Spin these up now. init_secondary() grabs them. We could use 1217 * #for(x,y,z) / #endfor cpp directives if they existed. 1218 */ 1219 for (x = 0; x < NCPU; x++) { 1220 gdt_segs[NGDT + x] = gdt_segs[GPROC0_SEL]; 1221 ssdtosd(&gdt_segs[NGDT + x], &gdt[NGDT + x].sd); 1222 } 1223#endif 1224 1225 /* make ldt memory segments */ 1226 /* 1227 * The data segment limit must not cover the user area because we 1228 * don't want the user area to be writable in copyout() etc. (page 1229 * level protection is lost in kernel mode on 386's). Also, we 1230 * don't want the user area to be writable directly (page level 1231 * protection of the user area is not available on 486's with 1232 * CR0_WP set, because there is no user-read/kernel-write mode). 1233 * 1234 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it 1235 * should be spelled ...MAX_USER... 1236 */ 1237#define VM_END_USER_RW_ADDRESS VM_MAXUSER_ADDRESS 1238 /* 1239 * The code segment limit has to cover the user area until we move 1240 * the signal trampoline out of the user area. This is safe because 1241 * the code segment cannot be written to directly. 1242 */ 1243#define VM_END_USER_R_ADDRESS (VM_END_USER_RW_ADDRESS + UPAGES * PAGE_SIZE) 1244 ldt_segs[LUCODE_SEL].ssd_limit = i386_btop(VM_END_USER_R_ADDRESS) - 1; 1245 ldt_segs[LUDATA_SEL].ssd_limit = i386_btop(VM_END_USER_RW_ADDRESS) - 1; 1246 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++) 1247 ssdtosd(&ldt_segs[x], &ldt[x].sd); 1248 1249 /* exceptions */ 1250 for (x = 0; x < NIDT; x++) 1251 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1252 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1253 setidt(1, &IDTVEC(dbg), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1254 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1255 setidt(3, &IDTVEC(bpt), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1256 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1257 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1258 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1259 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1260 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL)); 1261 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1262 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1263 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1264 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1265 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1266 setidt(14, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1267 setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1268 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1269 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1270 setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1271 setidt(0x80, &IDTVEC(int0x80_syscall), 1272 SDT_SYS386TGT, SEL_UPL, GSEL(GCODE_SEL, SEL_KPL)); 1273 1274#include "isa.h" 1275#if NISA >0 1276 isa_defaultirq(); 1277#endif 1278 rand_initialize(); 1279 1280 r_gdt.rd_limit = sizeof(gdt) - 1; 1281 r_gdt.rd_base = (int) gdt; 1282 lgdt(&r_gdt); 1283 1284 r_idt.rd_limit = sizeof(idt) - 1; 1285 r_idt.rd_base = (int) idt; 1286 lidt(&r_idt); 1287 1288 _default_ldt = GSEL(GLDT_SEL, SEL_KPL); 1289 lldt(_default_ldt); 1290#ifdef USER_LDT 1291 currentldt = _default_ldt; 1292#endif 1293 1294#ifdef DDB 1295 kdb_init(); 1296 if (boothowto & RB_KDB) 1297 Debugger("Boot flags requested debugger"); 1298#endif 1299 1300 finishidentcpu(); /* Final stage of CPU initialization */ 1301 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1302 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 1303 initializecpu(); /* Initialize CPU registers */ 1304 1305 /* make an initial tss so cpu can get interrupt stack on syscall! */ 1306#ifdef VM86 1307 common_tss.tss_esp0 = (int) proc0.p_addr + UPAGES*PAGE_SIZE - 16; 1308#else 1309 common_tss.tss_esp0 = (int) proc0.p_addr + UPAGES*PAGE_SIZE; 1310#endif /* VM86 */ 1311 common_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL) ; 1312 common_tss.tss_ioopt = (sizeof common_tss) << 16; 1313 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 1314 ltr(gsel_tss); 1315#ifdef VM86 1316 private_tss = 0; 1317 my_tr = GPROC0_SEL; 1318#endif 1319 1320 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 = 1321 dblfault_tss.tss_esp2 = (int) &dblfault_stack[sizeof(dblfault_stack)]; 1322 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 = 1323 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL); 1324 dblfault_tss.tss_cr3 = (int)IdlePTD; 1325 dblfault_tss.tss_eip = (int) dblfault_handler; 1326 dblfault_tss.tss_eflags = PSL_KERNEL; 1327 dblfault_tss.tss_ds = dblfault_tss.tss_es = dblfault_tss.tss_fs = 1328 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL); 1329 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL); 1330 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL); 1331 1332#ifdef VM86 1333 initial_bioscalls(&biosbasemem, &biosextmem); 1334#else 1335 1336 /* Use BIOS values stored in RTC CMOS RAM, since probing 1337 * breaks certain 386 AT relics. 1338 */ 1339 biosbasemem = rtcin(RTC_BASELO)+ (rtcin(RTC_BASEHI)<<8); 1340 biosextmem = rtcin(RTC_EXTLO)+ (rtcin(RTC_EXTHI)<<8); 1341#endif 1342 1343 /* 1344 * If BIOS tells us that it has more than 640k in the basemem, 1345 * don't believe it - set it to 640k. 1346 */ 1347 if (biosbasemem > 640) { 1348 printf("Preposterous RTC basemem of %uK, truncating to 640K\n", 1349 biosbasemem); 1350 biosbasemem = 640; 1351 } 1352 if (bootinfo.bi_memsizes_valid && bootinfo.bi_basemem > 640) { 1353 printf("Preposterous BIOS basemem of %uK, truncating to 640K\n", 1354 bootinfo.bi_basemem); 1355 bootinfo.bi_basemem = 640; 1356 } 1357 1358 /* 1359 * Warn if the official BIOS interface disagrees with the RTC 1360 * interface used above about the amount of base memory or the 1361 * amount of extended memory. Prefer the BIOS value for the base 1362 * memory. This is necessary for machines that `steal' base 1363 * memory for use as BIOS memory, at least if we are going to use 1364 * the BIOS for apm. Prefer the RTC value for extended memory. 1365 * Eventually the hackish interface shouldn't even be looked at. 1366 */ 1367 if (bootinfo.bi_memsizes_valid) { 1368 if (bootinfo.bi_basemem != biosbasemem) { 1369 vm_offset_t pa; 1370 1371 printf( 1372 "BIOS basemem (%uK) != RTC basemem (%uK), setting to BIOS value\n", 1373 bootinfo.bi_basemem, biosbasemem); 1374 biosbasemem = bootinfo.bi_basemem; 1375 1376 /* 1377 * XXX if biosbasemem is now < 640, there is `hole' 1378 * between the end of base memory and the start of 1379 * ISA memory. The hole may be empty or it may 1380 * contain BIOS code or data. Map it read/write so 1381 * that the BIOS can write to it. (Memory from 0 to 1382 * the physical end of the kernel is mapped read-only 1383 * to begin with and then parts of it are remapped. 1384 * The parts that aren't remapped form holes that 1385 * remain read-only and are unused by the kernel. 1386 * The base memory area is below the physical end of 1387 * the kernel and right now forms a read-only hole. 1388 * The part of it from PAGE_SIZE to 1389 * (trunc_page(biosbasemem * 1024) - 1) will be 1390 * remapped and used by the kernel later.) 1391 * 1392 * This code is similar to the code used in 1393 * pmap_mapdev, but since no memory needs to be 1394 * allocated we simply change the mapping. 1395 */ 1396 for (pa = trunc_page(biosbasemem * 1024); 1397 pa < ISA_HOLE_START; pa += PAGE_SIZE) { 1398 unsigned *pte; 1399 1400 pte = (unsigned *)vtopte(pa + KERNBASE); 1401 *pte = pa | PG_RW | PG_V; 1402 } 1403 } 1404 if (bootinfo.bi_extmem != biosextmem) 1405 printf("BIOS extmem (%uK) != RTC extmem (%uK)\n", 1406 bootinfo.bi_extmem, biosextmem); 1407 } 1408 1409#ifdef SMP 1410 /* make hole for AP bootstrap code */ 1411 pagesinbase = mp_bootaddress(biosbasemem) / PAGE_SIZE; 1412#else 1413 pagesinbase = biosbasemem * 1024 / PAGE_SIZE; 1414#endif 1415 1416 pagesinext = biosextmem * 1024 / PAGE_SIZE; 1417 1418 /* 1419 * Special hack for chipsets that still remap the 384k hole when 1420 * there's 16MB of memory - this really confuses people that 1421 * are trying to use bus mastering ISA controllers with the 1422 * "16MB limit"; they only have 16MB, but the remapping puts 1423 * them beyond the limit. 1424 */ 1425 /* 1426 * If extended memory is between 15-16MB (16-17MB phys address range), 1427 * chop it to 15MB. 1428 */ 1429 if ((pagesinext > 3840) && (pagesinext < 4096)) 1430 pagesinext = 3840; 1431 1432 /* 1433 * Maxmem isn't the "maximum memory", it's one larger than the 1434 * highest page of the physical address space. It should be 1435 * called something like "Maxphyspage". 1436 */ 1437 Maxmem = pagesinext + 0x100000/PAGE_SIZE; 1438 /* 1439 * Indicate that we wish to do a speculative search for memory beyond 1440 * the end of the reported size if the indicated amount is 64MB (0x4000 1441 * pages) - which is the largest amount that the BIOS/bootblocks can 1442 * currently report. If a specific amount of memory is indicated via 1443 * the MAXMEM option or the npx0 "msize", then don't do the speculative 1444 * memory probe. 1445 */ 1446 if (Maxmem >= 0x4000) 1447 speculative_mprobe = TRUE; 1448 else 1449 speculative_mprobe = FALSE; 1450 1451#ifdef MAXMEM 1452 Maxmem = MAXMEM/4; 1453 speculative_mprobe = FALSE; 1454#endif 1455 1456#if NNPX > 0 1457 idp = find_isadev(isa_devtab_null, &npxdriver, 0); 1458 if (idp != NULL && idp->id_msize != 0) { 1459 Maxmem = idp->id_msize / 4; 1460 speculative_mprobe = FALSE; 1461 } 1462#endif 1463 1464#ifdef SMP 1465 /* look for the MP hardware - needed for apic addresses */ 1466 mp_probe(); 1467#endif 1468 1469 /* call pmap initialization to make new kernel address space */ 1470 pmap_bootstrap (first, 0); 1471 1472 /* 1473 * Size up each available chunk of physical memory. 1474 */ 1475 1476 /* 1477 * We currently don't bother testing base memory. 1478 * XXX ...but we probably should. 1479 */ 1480 pa_indx = 0; 1481 if (pagesinbase > 1) { 1482 phys_avail[pa_indx++] = PAGE_SIZE; /* skip first page of memory */ 1483 phys_avail[pa_indx] = ptoa(pagesinbase);/* memory up to the ISA hole */ 1484 physmem = pagesinbase - 1; 1485 } else { 1486 /* point at first chunk end */ 1487 pa_indx++; 1488 } 1489 1490 for (target_page = avail_start; target_page < ptoa(Maxmem); target_page += PAGE_SIZE) { 1491 int tmp, page_bad; 1492 1493 page_bad = FALSE; 1494 1495 /* 1496 * map page into kernel: valid, read/write, non-cacheable 1497 */ 1498 *(int *)CMAP1 = PG_V | PG_RW | PG_N | target_page; 1499 invltlb(); 1500 1501 tmp = *(int *)CADDR1; 1502 /* 1503 * Test for alternating 1's and 0's 1504 */ 1505 *(volatile int *)CADDR1 = 0xaaaaaaaa; 1506 if (*(volatile int *)CADDR1 != 0xaaaaaaaa) { 1507 page_bad = TRUE; 1508 } 1509 /* 1510 * Test for alternating 0's and 1's 1511 */ 1512 *(volatile int *)CADDR1 = 0x55555555; 1513 if (*(volatile int *)CADDR1 != 0x55555555) { 1514 page_bad = TRUE; 1515 } 1516 /* 1517 * Test for all 1's 1518 */ 1519 *(volatile int *)CADDR1 = 0xffffffff; 1520 if (*(volatile int *)CADDR1 != 0xffffffff) { 1521 page_bad = TRUE; 1522 } 1523 /* 1524 * Test for all 0's 1525 */ 1526 *(volatile int *)CADDR1 = 0x0; 1527 if (*(volatile int *)CADDR1 != 0x0) { 1528 /* 1529 * test of page failed 1530 */ 1531 page_bad = TRUE; 1532 } 1533 /* 1534 * Restore original value. 1535 */ 1536 *(int *)CADDR1 = tmp; 1537 1538 /* 1539 * Adjust array of valid/good pages. 1540 */ 1541 if (page_bad == FALSE) { 1542 /* 1543 * If this good page is a continuation of the 1544 * previous set of good pages, then just increase 1545 * the end pointer. Otherwise start a new chunk. 1546 * Note that "end" points one higher than end, 1547 * making the range >= start and < end. 1548 * If we're also doing a speculative memory 1549 * test and we at or past the end, bump up Maxmem 1550 * so that we keep going. The first bad page 1551 * will terminate the loop. 1552 */ 1553 if (phys_avail[pa_indx] == target_page) { 1554 phys_avail[pa_indx] += PAGE_SIZE; 1555 if (speculative_mprobe == TRUE && 1556 phys_avail[pa_indx] >= (64*1024*1024)) 1557 Maxmem++; 1558 } else { 1559 pa_indx++; 1560 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 1561 printf("Too many holes in the physical address space, giving up\n"); 1562 pa_indx--; 1563 break; 1564 } 1565 phys_avail[pa_indx++] = target_page; /* start */ 1566 phys_avail[pa_indx] = target_page + PAGE_SIZE; /* end */ 1567 } 1568 physmem++; 1569 } 1570 } 1571 1572 *(int *)CMAP1 = 0; 1573 invltlb(); 1574 1575 /* 1576 * XXX 1577 * The last chunk must contain at least one page plus the message 1578 * buffer to avoid complicating other code (message buffer address 1579 * calculation, etc.). 1580 */ 1581 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 1582 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) { 1583 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 1584 phys_avail[pa_indx--] = 0; 1585 phys_avail[pa_indx--] = 0; 1586 } 1587 1588 Maxmem = atop(phys_avail[pa_indx]); 1589 1590 /* Trim off space for the message buffer. */ 1591 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE); 1592 1593 avail_end = phys_avail[pa_indx]; 1594 1595 /* now running on new page tables, configured,and u/iom is accessible */ 1596 1597 /* Map the message buffer. */ 1598 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE) 1599 pmap_enter(kernel_pmap, (vm_offset_t)msgbufp + off, 1600 avail_end + off, VM_PROT_ALL, TRUE); 1601 1602 msgbufinit(msgbufp, MSGBUF_SIZE); 1603 1604 /* make a call gate to reenter kernel with */ 1605 gdp = &ldt[LSYS5CALLS_SEL].gd; 1606 1607 x = (int) &IDTVEC(syscall); 1608 gdp->gd_looffset = x++; 1609 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL); 1610 gdp->gd_stkcpy = 1; 1611 gdp->gd_type = SDT_SYS386CGT; 1612 gdp->gd_dpl = SEL_UPL; 1613 gdp->gd_p = 1; 1614 gdp->gd_hioffset = ((int) &IDTVEC(syscall)) >>16; 1615 1616 /* XXX does this work? */ 1617 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL]; 1618 ldt[LSOL26CALLS_SEL] = ldt[LSYS5CALLS_SEL]; 1619 1620 /* transfer to user mode */ 1621 1622 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL); 1623 _udatasel = LSEL(LUDATA_SEL, SEL_UPL); 1624 1625 /* setup proc 0's pcb */ 1626 proc0.p_addr->u_pcb.pcb_flags = 0; 1627 proc0.p_addr->u_pcb.pcb_cr3 = (int)IdlePTD; 1628#ifdef SMP 1629 proc0.p_addr->u_pcb.pcb_mpnest = 1; 1630#endif 1631#ifdef VM86 1632 proc0.p_addr->u_pcb.pcb_ext = 0; 1633#endif 1634 1635 /* Sigh, relocate physical addresses left from bootstrap */ 1636 if (bootinfo.bi_modulep) { 1637 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE; 1638 preload_bootstrap_relocate(KERNBASE); 1639 } 1640 if (bootinfo.bi_envp) 1641 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE; 1642} 1643 1644#if defined(I586_CPU) && !defined(NO_F00F_HACK) 1645static void f00f_hack(void *unused); 1646SYSINIT(f00f_hack, SI_SUB_INTRINSIC, SI_ORDER_FIRST, f00f_hack, NULL); 1647 1648static void 1649f00f_hack(void *unused) { 1650#ifndef SMP 1651 struct region_descriptor r_idt; 1652#endif 1653 vm_offset_t tmp; 1654 1655 if (!has_f00f_bug) 1656 return; 1657 1658 printf("Intel Pentium detected, installing workaround for F00F bug\n"); 1659 1660 r_idt.rd_limit = sizeof(idt) - 1; 1661 1662 tmp = kmem_alloc(kernel_map, PAGE_SIZE * 2); 1663 if (tmp == 0) 1664 panic("kmem_alloc returned 0"); 1665 if (((unsigned int)tmp & (PAGE_SIZE-1)) != 0) 1666 panic("kmem_alloc returned non-page-aligned memory"); 1667 /* Put the first seven entries in the lower page */ 1668 t_idt = (struct gate_descriptor*)(tmp + PAGE_SIZE - (7*8)); 1669 bcopy(idt, t_idt, sizeof(idt)); 1670 r_idt.rd_base = (int)t_idt; 1671 lidt(&r_idt); 1672 if (vm_map_protect(kernel_map, tmp, tmp + PAGE_SIZE, 1673 VM_PROT_READ, FALSE) != KERN_SUCCESS) 1674 panic("vm_map_protect failed"); 1675 return; 1676} 1677#endif /* defined(I586_CPU) && !NO_F00F_HACK */ 1678 1679int 1680ptrace_set_pc(p, addr) 1681 struct proc *p; 1682 unsigned long addr; 1683{ 1684 p->p_md.md_regs->tf_eip = addr; 1685 return (0); 1686} 1687 1688int 1689ptrace_single_step(p) 1690 struct proc *p; 1691{ 1692 p->p_md.md_regs->tf_eflags |= PSL_T; 1693 return (0); 1694} 1695 1696int ptrace_read_u_check(p, addr, len) 1697 struct proc *p; 1698 vm_offset_t addr; 1699 size_t len; 1700{ 1701 vm_offset_t gap; 1702 1703 if ((vm_offset_t) (addr + len) < addr) 1704 return EPERM; 1705 if ((vm_offset_t) (addr + len) <= sizeof(struct user)) 1706 return 0; 1707 1708 gap = (char *) p->p_md.md_regs - (char *) p->p_addr; 1709 1710 if ((vm_offset_t) addr < gap) 1711 return EPERM; 1712 if ((vm_offset_t) (addr + len) <= 1713 (vm_offset_t) (gap + sizeof(struct trapframe))) 1714 return 0; 1715 return EPERM; 1716} 1717 1718int ptrace_write_u(p, off, data) 1719 struct proc *p; 1720 vm_offset_t off; 1721 long data; 1722{ 1723 struct trapframe frame_copy; 1724 vm_offset_t min; 1725 struct trapframe *tp; 1726 1727 /* 1728 * Privileged kernel state is scattered all over the user area. 1729 * Only allow write access to parts of regs and to fpregs. 1730 */ 1731 min = (char *)p->p_md.md_regs - (char *)p->p_addr; 1732 if (off >= min && off <= min + sizeof(struct trapframe) - sizeof(int)) { 1733 tp = p->p_md.md_regs; 1734 frame_copy = *tp; 1735 *(int *)((char *)&frame_copy + (off - min)) = data; 1736 if (!EFLAGS_SECURE(frame_copy.tf_eflags, tp->tf_eflags) || 1737 !CS_SECURE(frame_copy.tf_cs)) 1738 return (EINVAL); 1739 *(int*)((char *)p->p_addr + off) = data; 1740 return (0); 1741 } 1742 min = offsetof(struct user, u_pcb) + offsetof(struct pcb, pcb_savefpu); 1743 if (off >= min && off <= min + sizeof(struct save87) - sizeof(int)) { 1744 *(int*)((char *)p->p_addr + off) = data; 1745 return (0); 1746 } 1747 return (EFAULT); 1748} 1749 1750int 1751fill_regs(p, regs) 1752 struct proc *p; 1753 struct reg *regs; 1754{ 1755 struct pcb *pcb; 1756 struct trapframe *tp; 1757 1758 tp = p->p_md.md_regs; 1759 regs->r_es = tp->tf_es; 1760 regs->r_ds = tp->tf_ds; 1761 regs->r_edi = tp->tf_edi; 1762 regs->r_esi = tp->tf_esi; 1763 regs->r_ebp = tp->tf_ebp; 1764 regs->r_ebx = tp->tf_ebx; 1765 regs->r_edx = tp->tf_edx; 1766 regs->r_ecx = tp->tf_ecx; 1767 regs->r_eax = tp->tf_eax; 1768 regs->r_eip = tp->tf_eip; 1769 regs->r_cs = tp->tf_cs; 1770 regs->r_eflags = tp->tf_eflags; 1771 regs->r_esp = tp->tf_esp; 1772 regs->r_ss = tp->tf_ss; 1773 pcb = &p->p_addr->u_pcb; 1774 regs->r_fs = pcb->pcb_fs; 1775 regs->r_gs = pcb->pcb_gs; 1776 return (0); 1777} 1778 1779int 1780set_regs(p, regs) 1781 struct proc *p; 1782 struct reg *regs; 1783{ 1784 struct pcb *pcb; 1785 struct trapframe *tp; 1786 1787 tp = p->p_md.md_regs; 1788 if (!EFLAGS_SECURE(regs->r_eflags, tp->tf_eflags) || 1789 !CS_SECURE(regs->r_cs)) 1790 return (EINVAL); 1791 tp->tf_es = regs->r_es; 1792 tp->tf_ds = regs->r_ds; 1793 tp->tf_edi = regs->r_edi; 1794 tp->tf_esi = regs->r_esi; 1795 tp->tf_ebp = regs->r_ebp; 1796 tp->tf_ebx = regs->r_ebx; 1797 tp->tf_edx = regs->r_edx; 1798 tp->tf_ecx = regs->r_ecx; 1799 tp->tf_eax = regs->r_eax; 1800 tp->tf_eip = regs->r_eip; 1801 tp->tf_cs = regs->r_cs; 1802 tp->tf_eflags = regs->r_eflags; 1803 tp->tf_esp = regs->r_esp; 1804 tp->tf_ss = regs->r_ss; 1805 pcb = &p->p_addr->u_pcb; 1806 pcb->pcb_fs = regs->r_fs; 1807 pcb->pcb_gs = regs->r_gs; 1808 return (0); 1809} 1810 1811int 1812fill_fpregs(p, fpregs) 1813 struct proc *p; 1814 struct fpreg *fpregs; 1815{ 1816 bcopy(&p->p_addr->u_pcb.pcb_savefpu, fpregs, sizeof *fpregs); 1817 return (0); 1818} 1819 1820int 1821set_fpregs(p, fpregs) 1822 struct proc *p; 1823 struct fpreg *fpregs; 1824{ 1825 bcopy(fpregs, &p->p_addr->u_pcb.pcb_savefpu, sizeof *fpregs); 1826 return (0); 1827} 1828 1829#ifndef DDB 1830void 1831Debugger(const char *msg) 1832{ 1833 printf("Debugger(\"%s\") called.\n", msg); 1834} 1835#endif /* no DDB */ 1836 1837#include <sys/disklabel.h> 1838 1839/* 1840 * Determine the size of the transfer, and make sure it is 1841 * within the boundaries of the partition. Adjust transfer 1842 * if needed, and signal errors or early completion. 1843 */ 1844int 1845bounds_check_with_label(struct buf *bp, struct disklabel *lp, int wlabel) 1846{ 1847 struct partition *p = lp->d_partitions + dkpart(bp->b_dev); 1848 int labelsect = lp->d_partitions[0].p_offset; 1849 int maxsz = p->p_size, 1850 sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT; 1851 1852 /* overwriting disk label ? */ 1853 /* XXX should also protect bootstrap in first 8K */ 1854 if (bp->b_blkno + p->p_offset <= LABELSECTOR + labelsect && 1855#if LABELSECTOR != 0 1856 bp->b_blkno + p->p_offset + sz > LABELSECTOR + labelsect && 1857#endif 1858 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 1859 bp->b_error = EROFS; 1860 goto bad; 1861 } 1862 1863#if defined(DOSBBSECTOR) && defined(notyet) 1864 /* overwriting master boot record? */ 1865 if (bp->b_blkno + p->p_offset <= DOSBBSECTOR && 1866 (bp->b_flags & B_READ) == 0 && wlabel == 0) { 1867 bp->b_error = EROFS; 1868 goto bad; 1869 } 1870#endif 1871 1872 /* beyond partition? */ 1873 if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz) { 1874 /* if exactly at end of disk, return an EOF */ 1875 if (bp->b_blkno == maxsz) { 1876 bp->b_resid = bp->b_bcount; 1877 return(0); 1878 } 1879 /* or truncate if part of it fits */ 1880 sz = maxsz - bp->b_blkno; 1881 if (sz <= 0) { 1882 bp->b_error = EINVAL; 1883 goto bad; 1884 } 1885 bp->b_bcount = sz << DEV_BSHIFT; 1886 } 1887 1888 bp->b_pblkno = bp->b_blkno + p->p_offset; 1889 return(1); 1890 1891bad: 1892 bp->b_flags |= B_ERROR; 1893 return(-1); 1894} 1895 1896#ifdef DDB 1897 1898/* 1899 * Provide inb() and outb() as functions. They are normally only 1900 * available as macros calling inlined functions, thus cannot be 1901 * called inside DDB. 1902 * 1903 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined. 1904 */ 1905 1906#undef inb 1907#undef outb 1908 1909/* silence compiler warnings */ 1910u_char inb(u_int); 1911void outb(u_int, u_char); 1912 1913u_char 1914inb(u_int port) 1915{ 1916 u_char data; 1917 /* 1918 * We use %%dx and not %1 here because i/o is done at %dx and not at 1919 * %edx, while gcc generates inferior code (movw instead of movl) 1920 * if we tell it to load (u_short) port. 1921 */ 1922 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 1923 return (data); 1924} 1925 1926void 1927outb(u_int port, u_char data) 1928{ 1929 u_char al; 1930 /* 1931 * Use an unnecessary assignment to help gcc's register allocator. 1932 * This make a large difference for gcc-1.40 and a tiny difference 1933 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for 1934 * best results. gcc-2.6.0 can't handle this. 1935 */ 1936 al = data; 1937 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 1938} 1939 1940#endif /* DDB */ 1941