machdep.c revision 83366
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 * $FreeBSD: head/sys/amd64/amd64/machdep.c 83366 2001-09-12 08:38:13Z julian $ 39 */ 40 41#include "opt_atalk.h" 42#include "opt_compat.h" 43#include "opt_cpu.h" 44#include "opt_ddb.h" 45#include "opt_inet.h" 46#include "opt_ipx.h" 47#include "opt_isa.h" 48#include "opt_maxmem.h" 49#include "opt_msgbuf.h" 50#include "opt_npx.h" 51#include "opt_perfmon.h" 52#include "opt_kstack_pages.h" 53/* #include "opt_userconfig.h" */ 54 55#include <sys/param.h> 56#include <sys/systm.h> 57#include <sys/sysproto.h> 58#include <sys/signalvar.h> 59#include <sys/kernel.h> 60#include <sys/ktr.h> 61#include <sys/linker.h> 62#include <sys/lock.h> 63#include <sys/malloc.h> 64#include <sys/mutex.h> 65#include <sys/pcpu.h> 66#include <sys/proc.h> 67#include <sys/bio.h> 68#include <sys/buf.h> 69#include <sys/reboot.h> 70#include <sys/smp.h> 71#include <sys/callout.h> 72#include <sys/msgbuf.h> 73#include <sys/sysent.h> 74#include <sys/sysctl.h> 75#include <sys/vmmeter.h> 76#include <sys/bus.h> 77#include <sys/eventhandler.h> 78 79#include <vm/vm.h> 80#include <vm/vm_param.h> 81#include <sys/lock.h> 82#include <vm/vm_kern.h> 83#include <vm/vm_object.h> 84#include <vm/vm_page.h> 85#include <vm/vm_map.h> 86#include <vm/vm_pager.h> 87#include <vm/vm_extern.h> 88 89#include <sys/user.h> 90#include <sys/exec.h> 91#include <sys/cons.h> 92 93#include <ddb/ddb.h> 94 95#include <net/netisr.h> 96 97#include <machine/cpu.h> 98#include <machine/cputypes.h> 99#include <machine/reg.h> 100#include <machine/clock.h> 101#include <machine/specialreg.h> 102#include <machine/bootinfo.h> 103#include <machine/md_var.h> 104#include <machine/pc/bios.h> 105#include <machine/pcb_ext.h> /* pcb.h included via sys/user.h */ 106#include <machine/globals.h> 107#ifdef PERFMON 108#include <machine/perfmon.h> 109#endif 110#ifdef SMP 111#include <machine/privatespace.h> 112#endif 113 114#include <i386/isa/icu.h> 115#include <i386/isa/intr_machdep.h> 116#include <isa/rtc.h> 117#include <machine/vm86.h> 118#include <sys/ptrace.h> 119#include <machine/sigframe.h> 120 121extern void init386 __P((int first)); 122extern void dblfault_handler __P((void)); 123 124extern void printcpuinfo(void); /* XXX header file */ 125extern void earlysetcpuclass(void); /* same header file */ 126extern void finishidentcpu(void); 127extern void panicifcpuunsupported(void); 128extern void initializecpu(void); 129 130#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 131#define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 132 133static void cpu_startup __P((void *)); 134#ifdef CPU_ENABLE_SSE 135static void set_fpregs_xmm __P((struct save87 *, struct savexmm *)); 136static void fill_fpregs_xmm __P((struct savexmm *, struct save87 *)); 137#endif /* CPU_ENABLE_SSE */ 138SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL) 139 140int _udatasel, _ucodesel; 141u_int atdevbase; 142 143#if defined(SWTCH_OPTIM_STATS) 144extern int swtch_optim_stats; 145SYSCTL_INT(_debug, OID_AUTO, swtch_optim_stats, 146 CTLFLAG_RD, &swtch_optim_stats, 0, ""); 147SYSCTL_INT(_debug, OID_AUTO, tlb_flush_count, 148 CTLFLAG_RD, &tlb_flush_count, 0, ""); 149#endif 150 151#ifdef PC98 152static int ispc98 = 1; 153#else 154static int ispc98 = 0; 155#endif 156SYSCTL_INT(_machdep, OID_AUTO, ispc98, CTLFLAG_RD, &ispc98, 0, ""); 157 158int physmem = 0; 159int cold = 1; 160 161#ifdef COMPAT_43 162static void osendsig __P((sig_t catcher, int sig, sigset_t *mask, u_long code)); 163#endif 164 165static int 166sysctl_hw_physmem(SYSCTL_HANDLER_ARGS) 167{ 168 int error = sysctl_handle_int(oidp, 0, ctob(physmem), req); 169 return (error); 170} 171 172SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_INT|CTLFLAG_RD, 173 0, 0, sysctl_hw_physmem, "IU", ""); 174 175static int 176sysctl_hw_usermem(SYSCTL_HANDLER_ARGS) 177{ 178 int error = sysctl_handle_int(oidp, 0, 179 ctob(physmem - cnt.v_wire_count), req); 180 return (error); 181} 182 183SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD, 184 0, 0, sysctl_hw_usermem, "IU", ""); 185 186static int 187sysctl_hw_availpages(SYSCTL_HANDLER_ARGS) 188{ 189 int error = sysctl_handle_int(oidp, 0, 190 i386_btop(avail_end - avail_start), req); 191 return (error); 192} 193 194SYSCTL_PROC(_hw, OID_AUTO, availpages, CTLTYPE_INT|CTLFLAG_RD, 195 0, 0, sysctl_hw_availpages, "I", ""); 196 197int Maxmem = 0; 198long dumplo; 199 200vm_offset_t phys_avail[10]; 201 202/* must be 2 less so 0 0 can signal end of chunks */ 203#define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(vm_offset_t)) - 2) 204 205struct kva_md_info kmi; 206 207static struct trapframe proc0_tf; 208#ifndef SMP 209static struct globaldata __globaldata; 210#endif 211 212struct mtx sched_lock; 213struct mtx Giant; 214 215static void 216cpu_startup(dummy) 217 void *dummy; 218{ 219 /* 220 * Good {morning,afternoon,evening,night}. 221 */ 222 earlysetcpuclass(); 223 startrtclock(); 224 printcpuinfo(); 225 panicifcpuunsupported(); 226#ifdef PERFMON 227 perfmon_init(); 228#endif 229 printf("real memory = %u (%uK bytes)\n", ptoa(Maxmem), 230 ptoa(Maxmem) / 1024); 231 /* 232 * Display any holes after the first chunk of extended memory. 233 */ 234 if (bootverbose) { 235 int indx; 236 237 printf("Physical memory chunk(s):\n"); 238 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) { 239 unsigned int size1; 240 241 size1 = phys_avail[indx + 1] - phys_avail[indx]; 242 printf("0x%08x - 0x%08x, %u bytes (%u pages)\n", 243 phys_avail[indx], phys_avail[indx + 1] - 1, size1, 244 size1 / PAGE_SIZE); 245 } 246 } 247 248 vm_ksubmap_init(&kmi); 249 250#if defined(USERCONFIG) 251 userconfig(); 252 cninit(); /* the preferred console may have changed */ 253#endif 254 255 printf("avail memory = %u (%uK bytes)\n", ptoa(cnt.v_free_count), 256 ptoa(cnt.v_free_count) / 1024); 257 258 /* 259 * Set up buffers, so they can be used to read disk labels. 260 */ 261 bufinit(); 262 vm_pager_bufferinit(); 263 264 globaldata_register(GLOBALDATA); 265#ifndef SMP 266 /* For SMP, we delay the cpu_setregs() until after SMP startup. */ 267 cpu_setregs(); 268#endif 269} 270 271/* 272 * Send an interrupt to process. 273 * 274 * Stack is set up to allow sigcode stored 275 * at top to call routine, followed by kcall 276 * to sigreturn routine below. After sigreturn 277 * resets the signal mask, the stack, and the 278 * frame pointer, it returns to the user 279 * specified pc, psl. 280 */ 281#ifdef COMPAT_43 282static void 283osendsig(catcher, sig, mask, code) 284 sig_t catcher; 285 int sig; 286 sigset_t *mask; 287 u_long code; 288{ 289 struct osigframe sf; 290 struct osigframe *fp; 291 struct proc *p; 292 struct thread *td; 293 struct sigacts *psp; 294 struct trapframe *regs; 295 int oonstack; 296 297 td = curthread; 298 p = td->td_proc; 299 PROC_LOCK_ASSERT(p, MA_OWNED); 300 psp = p->p_sigacts; 301 regs = td->td_frame; 302 oonstack = sigonstack(regs->tf_esp); 303 304 /* Allocate and validate space for the signal handler context. */ 305 if ((p->p_flag & P_ALTSTACK) && !oonstack && 306 SIGISMEMBER(psp->ps_sigonstack, sig)) { 307 fp = (struct osigframe *)(p->p_sigstk.ss_sp + 308 p->p_sigstk.ss_size - sizeof(struct osigframe)); 309#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 310 p->p_sigstk.ss_flags |= SS_ONSTACK; 311#endif 312 } else 313 fp = (struct osigframe *)regs->tf_esp - 1; 314 PROC_UNLOCK(p); 315 316 /* 317 * grow_stack() will return 0 if *fp does not fit inside the stack 318 * and the stack can not be grown. 319 * useracc() will return FALSE if access is denied. 320 */ 321 if (grow_stack(p, (int)fp) == 0 || 322 !useracc((caddr_t)fp, sizeof(*fp), VM_PROT_WRITE)) { 323 /* 324 * Process has trashed its stack; give it an illegal 325 * instruction to halt it in its tracks. 326 */ 327 PROC_LOCK(p); 328 SIGACTION(p, SIGILL) = SIG_DFL; 329 SIGDELSET(p->p_sigignore, SIGILL); 330 SIGDELSET(p->p_sigcatch, SIGILL); 331 SIGDELSET(p->p_sigmask, SIGILL); 332 psignal(p, SIGILL); 333 return; 334 } 335 336 /* Translate the signal if appropriate. */ 337 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize) 338 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 339 340 /* Build the argument list for the signal handler. */ 341 sf.sf_signum = sig; 342 sf.sf_scp = (register_t)&fp->sf_siginfo.si_sc; 343 PROC_LOCK(p); 344 if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) { 345 /* Signal handler installed with SA_SIGINFO. */ 346 sf.sf_arg2 = (register_t)&fp->sf_siginfo; 347 sf.sf_siginfo.si_signo = sig; 348 sf.sf_siginfo.si_code = code; 349 sf.sf_ahu.sf_action = (__osiginfohandler_t *)catcher; 350 } else { 351 /* Old FreeBSD-style arguments. */ 352 sf.sf_arg2 = code; 353 sf.sf_addr = regs->tf_err; 354 sf.sf_ahu.sf_handler = catcher; 355 } 356 PROC_UNLOCK(p); 357 358 /* Save most if not all of trap frame. */ 359 sf.sf_siginfo.si_sc.sc_eax = regs->tf_eax; 360 sf.sf_siginfo.si_sc.sc_ebx = regs->tf_ebx; 361 sf.sf_siginfo.si_sc.sc_ecx = regs->tf_ecx; 362 sf.sf_siginfo.si_sc.sc_edx = regs->tf_edx; 363 sf.sf_siginfo.si_sc.sc_esi = regs->tf_esi; 364 sf.sf_siginfo.si_sc.sc_edi = regs->tf_edi; 365 sf.sf_siginfo.si_sc.sc_cs = regs->tf_cs; 366 sf.sf_siginfo.si_sc.sc_ds = regs->tf_ds; 367 sf.sf_siginfo.si_sc.sc_ss = regs->tf_ss; 368 sf.sf_siginfo.si_sc.sc_es = regs->tf_es; 369 sf.sf_siginfo.si_sc.sc_fs = regs->tf_fs; 370 sf.sf_siginfo.si_sc.sc_gs = rgs(); 371 sf.sf_siginfo.si_sc.sc_isp = regs->tf_isp; 372 373 /* Build the signal context to be used by osigreturn(). */ 374 sf.sf_siginfo.si_sc.sc_onstack = (oonstack) ? 1 : 0; 375 SIG2OSIG(*mask, sf.sf_siginfo.si_sc.sc_mask); 376 sf.sf_siginfo.si_sc.sc_sp = regs->tf_esp; 377 sf.sf_siginfo.si_sc.sc_fp = regs->tf_ebp; 378 sf.sf_siginfo.si_sc.sc_pc = regs->tf_eip; 379 sf.sf_siginfo.si_sc.sc_ps = regs->tf_eflags; 380 sf.sf_siginfo.si_sc.sc_trapno = regs->tf_trapno; 381 sf.sf_siginfo.si_sc.sc_err = regs->tf_err; 382 383 /* 384 * If we're a vm86 process, we want to save the segment registers. 385 * We also change eflags to be our emulated eflags, not the actual 386 * eflags. 387 */ 388 if (regs->tf_eflags & PSL_VM) { 389 /* XXX confusing names: `tf' isn't a trapframe; `regs' is. */ 390 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 391 struct vm86_kernel *vm86 = &td->td_pcb->pcb_ext->ext_vm86; 392 393 sf.sf_siginfo.si_sc.sc_gs = tf->tf_vm86_gs; 394 sf.sf_siginfo.si_sc.sc_fs = tf->tf_vm86_fs; 395 sf.sf_siginfo.si_sc.sc_es = tf->tf_vm86_es; 396 sf.sf_siginfo.si_sc.sc_ds = tf->tf_vm86_ds; 397 398 if (vm86->vm86_has_vme == 0) 399 sf.sf_siginfo.si_sc.sc_ps = 400 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) | 401 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 402 403 /* See sendsig() for comments. */ 404 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_T | PSL_VIF | PSL_VIP); 405 } 406 407 /* Copy the sigframe out to the user's stack. */ 408 if (copyout(&sf, fp, sizeof(*fp)) != 0) { 409 /* 410 * Something is wrong with the stack pointer. 411 * ...Kill the process. 412 */ 413 PROC_LOCK(p); 414 sigexit(td, SIGILL); 415 /* NOTREACHED */ 416 } 417 418 regs->tf_esp = (int)fp; 419 regs->tf_eip = PS_STRINGS - szosigcode; 420 regs->tf_cs = _ucodesel; 421 regs->tf_ds = _udatasel; 422 regs->tf_es = _udatasel; 423 regs->tf_fs = _udatasel; 424 load_gs(_udatasel); 425 regs->tf_ss = _udatasel; 426 PROC_LOCK(p); 427} 428#endif 429 430void 431sendsig(catcher, sig, mask, code) 432 sig_t catcher; 433 int sig; 434 sigset_t *mask; 435 u_long code; 436{ 437 struct sigframe sf; 438 struct proc *p; 439 struct thread *td; 440 struct sigacts *psp; 441 struct trapframe *regs; 442 struct sigframe *sfp; 443 int oonstack; 444 445 td = curthread; 446 p = td->td_proc; 447 PROC_LOCK_ASSERT(p, MA_OWNED); 448 psp = p->p_sigacts; 449#ifdef COMPAT_43 450 if (SIGISMEMBER(psp->ps_osigset, sig)) { 451 osendsig(catcher, sig, mask, code); 452 return; 453 } 454#endif 455 regs = td->td_frame; 456 oonstack = sigonstack(regs->tf_esp); 457 458 /* Save user context. */ 459 bzero(&sf, sizeof(sf)); 460 sf.sf_uc.uc_sigmask = *mask; 461 sf.sf_uc.uc_stack = p->p_sigstk; 462 sf.sf_uc.uc_stack.ss_flags = (p->p_flag & P_ALTSTACK) 463 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE; 464 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0; 465 sf.sf_uc.uc_mcontext.mc_gs = rgs(); 466 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(*regs)); 467 468 /* Allocate and validate space for the signal handler context. */ 469 if ((p->p_flag & P_ALTSTACK) != 0 && !oonstack && 470 SIGISMEMBER(psp->ps_sigonstack, sig)) { 471 sfp = (struct sigframe *)(p->p_sigstk.ss_sp + 472 p->p_sigstk.ss_size - sizeof(struct sigframe)); 473#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 474 p->p_sigstk.ss_flags |= SS_ONSTACK; 475#endif 476 } else 477 sfp = (struct sigframe *)regs->tf_esp - 1; 478 PROC_UNLOCK(p); 479 480 /* 481 * grow_stack() will return 0 if *sfp does not fit inside the stack 482 * and the stack can not be grown. 483 * useracc() will return FALSE if access is denied. 484 */ 485 if (grow_stack(p, (int)sfp) == 0 || 486 !useracc((caddr_t)sfp, sizeof(*sfp), VM_PROT_WRITE)) { 487 /* 488 * Process has trashed its stack; give it an illegal 489 * instruction to halt it in its tracks. 490 */ 491#ifdef DEBUG 492 printf("process %d has trashed its stack\n", p->p_pid); 493#endif 494 PROC_LOCK(p); 495 SIGACTION(p, SIGILL) = SIG_DFL; 496 SIGDELSET(p->p_sigignore, SIGILL); 497 SIGDELSET(p->p_sigcatch, SIGILL); 498 SIGDELSET(p->p_sigmask, SIGILL); 499 psignal(p, SIGILL); 500 return; 501 } 502 503 /* Translate the signal if appropriate. */ 504 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize) 505 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 506 507 /* Build the argument list for the signal handler. */ 508 sf.sf_signum = sig; 509 sf.sf_ucontext = (register_t)&sfp->sf_uc; 510 PROC_LOCK(p); 511 if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) { 512 /* Signal handler installed with SA_SIGINFO. */ 513 sf.sf_siginfo = (register_t)&sfp->sf_si; 514 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher; 515 516 /* Fill siginfo structure. */ 517 sf.sf_si.si_signo = sig; 518 sf.sf_si.si_code = code; 519 sf.sf_si.si_addr = (void *)regs->tf_err; 520 } else { 521 /* Old FreeBSD-style arguments. */ 522 sf.sf_siginfo = code; 523 sf.sf_addr = regs->tf_err; 524 sf.sf_ahu.sf_handler = catcher; 525 } 526 PROC_UNLOCK(p); 527 528 /* 529 * If we're a vm86 process, we want to save the segment registers. 530 * We also change eflags to be our emulated eflags, not the actual 531 * eflags. 532 */ 533 if (regs->tf_eflags & PSL_VM) { 534 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 535 struct vm86_kernel *vm86 = &td->td_pcb->pcb_ext->ext_vm86; 536 537 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs; 538 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs; 539 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es; 540 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds; 541 542 if (vm86->vm86_has_vme == 0) 543 sf.sf_uc.uc_mcontext.mc_eflags = 544 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) | 545 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 546 547 /* 548 * We should never have PSL_T set when returning from vm86 549 * mode. It may be set here if we deliver a signal before 550 * getting to vm86 mode, so turn it off. 551 * 552 * Clear PSL_NT to inhibit T_TSSFLT faults on return from 553 * syscalls made by the signal handler. This just avoids 554 * wasting time for our lazy fixup of such faults. PSL_NT 555 * does nothing in vm86 mode, but vm86 programs can set it 556 * almost legitimately in probes for old cpu types. 557 */ 558 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_T | PSL_VIF | PSL_VIP); 559 } 560 561 /* Copy the sigframe out to the user's stack. */ 562 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) { 563 /* 564 * Something is wrong with the stack pointer. 565 * ...Kill the process. 566 */ 567 PROC_LOCK(p); 568 sigexit(td, SIGILL); 569 /* NOTREACHED */ 570 } 571 572 regs->tf_esp = (int)sfp; 573 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode); 574 regs->tf_cs = _ucodesel; 575 regs->tf_ds = _udatasel; 576 regs->tf_es = _udatasel; 577 regs->tf_fs = _udatasel; 578 regs->tf_ss = _udatasel; 579 PROC_LOCK(p); 580} 581 582/* 583 * System call to cleanup state after a signal 584 * has been taken. Reset signal mask and 585 * stack state from context left by sendsig (above). 586 * Return to previous pc and psl as specified by 587 * context left by sendsig. Check carefully to 588 * make sure that the user has not modified the 589 * state to gain improper privileges. 590 */ 591#ifdef COMPAT_43 592int 593osigreturn(td, uap) 594 struct thread *td; 595 struct osigreturn_args /* { 596 struct osigcontext *sigcntxp; 597 } */ *uap; 598{ 599 struct trapframe *regs; 600 struct osigcontext *scp; 601 struct proc *p = td->td_proc; 602 int eflags; 603 604 regs = td->td_frame; 605 scp = uap->sigcntxp; 606 if (!useracc((caddr_t)scp, sizeof(*scp), VM_PROT_READ)) 607 return (EFAULT); 608 eflags = scp->sc_ps; 609 if (eflags & PSL_VM) { 610 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 611 struct vm86_kernel *vm86; 612 613 /* 614 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 615 * set up the vm86 area, and we can't enter vm86 mode. 616 */ 617 if (td->td_pcb->pcb_ext == 0) 618 return (EINVAL); 619 vm86 = &td->td_pcb->pcb_ext->ext_vm86; 620 if (vm86->vm86_inited == 0) 621 return (EINVAL); 622 623 /* Go back to user mode if both flags are set. */ 624 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 625 trapsignal(p, SIGBUS, 0); 626 627 if (vm86->vm86_has_vme) { 628 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 629 (eflags & VME_USERCHANGE) | PSL_VM; 630 } else { 631 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 632 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | 633 (eflags & VM_USERCHANGE) | PSL_VM; 634 } 635 tf->tf_vm86_ds = scp->sc_ds; 636 tf->tf_vm86_es = scp->sc_es; 637 tf->tf_vm86_fs = scp->sc_fs; 638 tf->tf_vm86_gs = scp->sc_gs; 639 tf->tf_ds = _udatasel; 640 tf->tf_es = _udatasel; 641 tf->tf_fs = _udatasel; 642 } else { 643 /* 644 * Don't allow users to change privileged or reserved flags. 645 */ 646 /* 647 * XXX do allow users to change the privileged flag PSL_RF. 648 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 649 * should sometimes set it there too. tf_eflags is kept in 650 * the signal context during signal handling and there is no 651 * other place to remember it, so the PSL_RF bit may be 652 * corrupted by the signal handler without us knowing. 653 * Corruption of the PSL_RF bit at worst causes one more or 654 * one less debugger trap, so allowing it is fairly harmless. 655 */ 656 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 657 return (EINVAL); 658 } 659 660 /* 661 * Don't allow users to load a valid privileged %cs. Let the 662 * hardware check for invalid selectors, excess privilege in 663 * other selectors, invalid %eip's and invalid %esp's. 664 */ 665 if (!CS_SECURE(scp->sc_cs)) { 666 trapsignal(p, SIGBUS, T_PROTFLT); 667 return (EINVAL); 668 } 669 regs->tf_ds = scp->sc_ds; 670 regs->tf_es = scp->sc_es; 671 regs->tf_fs = scp->sc_fs; 672 } 673 674 /* Restore remaining registers. */ 675 regs->tf_eax = scp->sc_eax; 676 regs->tf_ebx = scp->sc_ebx; 677 regs->tf_ecx = scp->sc_ecx; 678 regs->tf_edx = scp->sc_edx; 679 regs->tf_esi = scp->sc_esi; 680 regs->tf_edi = scp->sc_edi; 681 regs->tf_cs = scp->sc_cs; 682 regs->tf_ss = scp->sc_ss; 683 regs->tf_isp = scp->sc_isp; 684 685 PROC_LOCK(p); 686#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 687 if (scp->sc_onstack & 1) 688 p->p_sigstk.ss_flags |= SS_ONSTACK; 689 else 690 p->p_sigstk.ss_flags &= ~SS_ONSTACK; 691#endif 692 693 SIGSETOLD(p->p_sigmask, scp->sc_mask); 694 SIG_CANTMASK(p->p_sigmask); 695 PROC_UNLOCK(p); 696 regs->tf_ebp = scp->sc_fp; 697 regs->tf_esp = scp->sc_sp; 698 regs->tf_eip = scp->sc_pc; 699 regs->tf_eflags = eflags; 700 return (EJUSTRETURN); 701} 702#endif 703 704int 705sigreturn(td, uap) 706 struct thread *td; 707 struct sigreturn_args /* { 708 ucontext_t *sigcntxp; 709 } */ *uap; 710{ 711 struct proc *p = td->td_proc; 712 struct trapframe *regs; 713 ucontext_t *ucp; 714 int cs, eflags; 715 716 ucp = uap->sigcntxp; 717#ifdef COMPAT_43 718 if (!useracc((caddr_t)ucp, sizeof(struct osigcontext), VM_PROT_READ)) 719 return (EFAULT); 720 if (((struct osigcontext *)ucp)->sc_trapno == 0x01d516) 721 return (osigreturn(td, (struct osigreturn_args *)uap)); 722 /* 723 * Since ucp is not an osigcontext but a ucontext_t, we have to 724 * check again if all of it is accessible. A ucontext_t is 725 * much larger, so instead of just checking for the pointer 726 * being valid for the size of an osigcontext, now check for 727 * it being valid for a whole, new-style ucontext_t. 728 */ 729#endif 730 if (!useracc((caddr_t)ucp, sizeof(*ucp), VM_PROT_READ)) 731 return (EFAULT); 732 733 regs = td->td_frame; 734 eflags = ucp->uc_mcontext.mc_eflags; 735 if (eflags & PSL_VM) { 736 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 737 struct vm86_kernel *vm86; 738 739 /* 740 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 741 * set up the vm86 area, and we can't enter vm86 mode. 742 */ 743 if (td->td_pcb->pcb_ext == 0) 744 return (EINVAL); 745 vm86 = &td->td_pcb->pcb_ext->ext_vm86; 746 if (vm86->vm86_inited == 0) 747 return (EINVAL); 748 749 /* Go back to user mode if both flags are set. */ 750 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 751 trapsignal(p, SIGBUS, 0); 752 753 if (vm86->vm86_has_vme) { 754 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 755 (eflags & VME_USERCHANGE) | PSL_VM; 756 } else { 757 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 758 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | 759 (eflags & VM_USERCHANGE) | PSL_VM; 760 } 761 bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe)); 762 tf->tf_eflags = eflags; 763 tf->tf_vm86_ds = tf->tf_ds; 764 tf->tf_vm86_es = tf->tf_es; 765 tf->tf_vm86_fs = tf->tf_fs; 766 tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs; 767 tf->tf_ds = _udatasel; 768 tf->tf_es = _udatasel; 769 tf->tf_fs = _udatasel; 770 } else { 771 /* 772 * Don't allow users to change privileged or reserved flags. 773 */ 774 /* 775 * XXX do allow users to change the privileged flag PSL_RF. 776 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 777 * should sometimes set it there too. tf_eflags is kept in 778 * the signal context during signal handling and there is no 779 * other place to remember it, so the PSL_RF bit may be 780 * corrupted by the signal handler without us knowing. 781 * Corruption of the PSL_RF bit at worst causes one more or 782 * one less debugger trap, so allowing it is fairly harmless. 783 */ 784 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 785 printf("sigreturn: eflags = 0x%x\n", eflags); 786 return (EINVAL); 787 } 788 789 /* 790 * Don't allow users to load a valid privileged %cs. Let the 791 * hardware check for invalid selectors, excess privilege in 792 * other selectors, invalid %eip's and invalid %esp's. 793 */ 794 cs = ucp->uc_mcontext.mc_cs; 795 if (!CS_SECURE(cs)) { 796 printf("sigreturn: cs = 0x%x\n", cs); 797 trapsignal(p, SIGBUS, T_PROTFLT); 798 return (EINVAL); 799 } 800 801 bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(*regs)); 802 } 803 804 PROC_LOCK(p); 805#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 806 if (ucp->uc_mcontext.mc_onstack & 1) 807 p->p_sigstk.ss_flags |= SS_ONSTACK; 808 else 809 p->p_sigstk.ss_flags &= ~SS_ONSTACK; 810#endif 811 812 p->p_sigmask = ucp->uc_sigmask; 813 SIG_CANTMASK(p->p_sigmask); 814 PROC_UNLOCK(p); 815 return (EJUSTRETURN); 816} 817 818/* 819 * Machine dependent boot() routine 820 * 821 * I haven't seen anything to put here yet 822 * Possibly some stuff might be grafted back here from boot() 823 */ 824void 825cpu_boot(int howto) 826{ 827} 828 829/* 830 * Shutdown the CPU as much as possible 831 */ 832void 833cpu_halt(void) 834{ 835 for (;;) 836 __asm__ ("hlt"); 837} 838 839/* 840 * Hook to idle the CPU when possible. This currently only works in 841 * the !SMP case, as there is no clean way to ensure that a CPU will be 842 * woken when there is work available for it. 843 */ 844static int cpu_idle_hlt = 1; 845SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW, 846 &cpu_idle_hlt, 0, "Idle loop HLT enable"); 847 848/* 849 * Note that we have to be careful here to avoid a race between checking 850 * procrunnable() and actually halting. If we don't do this, we may waste 851 * the time between calling hlt and the next interrupt even though there 852 * is a runnable process. 853 */ 854void 855cpu_idle(void) 856{ 857#ifndef SMP 858 if (cpu_idle_hlt) { 859 disable_intr(); 860 if (procrunnable()) 861 enable_intr(); 862 else { 863 enable_intr(); 864 __asm __volatile("hlt"); 865 } 866 } 867#endif 868} 869 870/* 871 * Clear registers on exec 872 */ 873void 874setregs(td, entry, stack, ps_strings) 875 struct thread *td; 876 u_long entry; 877 u_long stack; 878 u_long ps_strings; 879{ 880 struct trapframe *regs = td->td_frame; 881 struct pcb *pcb = td->td_pcb; 882 883 if (pcb->pcb_ldt) 884 user_ldt_free(pcb); 885 886 bzero((char *)regs, sizeof(struct trapframe)); 887 regs->tf_eip = entry; 888 regs->tf_esp = stack; 889 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T); 890 regs->tf_ss = _udatasel; 891 regs->tf_ds = _udatasel; 892 regs->tf_es = _udatasel; 893 regs->tf_fs = _udatasel; 894 regs->tf_cs = _ucodesel; 895 896 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */ 897 regs->tf_ebx = ps_strings; 898 899 /* reset %gs as well */ 900 if (pcb == PCPU_GET(curpcb)) 901 load_gs(_udatasel); 902 else 903 pcb->pcb_gs = _udatasel; 904 905 /* 906 * Reset the hardware debug registers if they were in use. 907 * They won't have any meaning for the newly exec'd process. 908 */ 909 if (pcb->pcb_flags & PCB_DBREGS) { 910 pcb->pcb_dr0 = 0; 911 pcb->pcb_dr1 = 0; 912 pcb->pcb_dr2 = 0; 913 pcb->pcb_dr3 = 0; 914 pcb->pcb_dr6 = 0; 915 pcb->pcb_dr7 = 0; 916 if (pcb == PCPU_GET(curpcb)) { 917 /* 918 * Clear the debug registers on the running 919 * CPU, otherwise they will end up affecting 920 * the next process we switch to. 921 */ 922 reset_dbregs(); 923 } 924 pcb->pcb_flags &= ~PCB_DBREGS; 925 } 926 927 /* 928 * Initialize the math emulator (if any) for the current process. 929 * Actually, just clear the bit that says that the emulator has 930 * been initialized. Initialization is delayed until the process 931 * traps to the emulator (if it is done at all) mainly because 932 * emulators don't provide an entry point for initialization. 933 */ 934 td->td_pcb->pcb_flags &= ~FP_SOFTFP; 935 936 /* 937 * Arrange to trap the next npx or `fwait' instruction (see npx.c 938 * for why fwait must be trapped at least if there is an npx or an 939 * emulator). This is mainly to handle the case where npx0 is not 940 * configured, since the npx routines normally set up the trap 941 * otherwise. It should be done only at boot time, but doing it 942 * here allows modifying `npx_exists' for testing the emulator on 943 * systems with an npx. 944 */ 945 load_cr0(rcr0() | CR0_MP | CR0_TS); 946 947#ifdef DEV_NPX 948 /* Initialize the npx (if any) for the current process. */ 949 npxinit(__INITIAL_NPXCW__); 950#endif 951 952 /* 953 * XXX - Linux emulator 954 * Make sure sure edx is 0x0 on entry. Linux binaries depend 955 * on it. 956 */ 957 td->td_retval[1] = 0; 958} 959 960void 961cpu_setregs(void) 962{ 963 unsigned int cr0; 964 965 cr0 = rcr0(); 966 cr0 |= CR0_NE; /* Done by npxinit() */ 967 cr0 |= CR0_MP | CR0_TS; /* Done at every execve() too. */ 968#ifndef I386_CPU 969 cr0 |= CR0_WP | CR0_AM; 970#endif 971 load_cr0(cr0); 972 load_gs(_udatasel); 973} 974 975static int 976sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS) 977{ 978 int error; 979 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 980 req); 981 if (!error && req->newptr) 982 resettodr(); 983 return (error); 984} 985 986SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 987 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 988 989SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, 990 CTLFLAG_RW, &disable_rtc_set, 0, ""); 991 992SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo, 993 CTLFLAG_RD, &bootinfo, bootinfo, ""); 994 995SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock, 996 CTLFLAG_RW, &wall_cmos_clock, 0, ""); 997 998/* 999 * Initialize 386 and configure to run kernel 1000 */ 1001 1002/* 1003 * Initialize segments & interrupt table 1004 */ 1005 1006int _default_ldt; 1007union descriptor gdt[NGDT * MAXCPU]; /* global descriptor table */ 1008static struct gate_descriptor idt0[NIDT]; 1009struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */ 1010union descriptor ldt[NLDT]; /* local descriptor table */ 1011#ifdef SMP 1012/* table descriptors - used to load tables by microp */ 1013struct region_descriptor r_gdt, r_idt; 1014#endif 1015 1016int private_tss; /* flag indicating private tss */ 1017 1018#if defined(I586_CPU) && !defined(NO_F00F_HACK) 1019extern int has_f00f_bug; 1020#endif 1021 1022static struct i386tss dblfault_tss; 1023static char dblfault_stack[PAGE_SIZE]; 1024 1025extern struct user *proc0uarea; 1026extern vm_offset_t proc0kstack; 1027 1028 1029/* software prototypes -- in more palatable form */ 1030struct soft_segment_descriptor gdt_segs[] = { 1031/* GNULL_SEL 0 Null Descriptor */ 1032{ 0x0, /* segment base address */ 1033 0x0, /* length */ 1034 0, /* segment type */ 1035 0, /* segment descriptor priority level */ 1036 0, /* segment descriptor present */ 1037 0, 0, 1038 0, /* default 32 vs 16 bit size */ 1039 0 /* limit granularity (byte/page units)*/ }, 1040/* GCODE_SEL 1 Code Descriptor for kernel */ 1041{ 0x0, /* segment base address */ 1042 0xfffff, /* length - all address space */ 1043 SDT_MEMERA, /* segment type */ 1044 0, /* segment descriptor priority level */ 1045 1, /* segment descriptor present */ 1046 0, 0, 1047 1, /* default 32 vs 16 bit size */ 1048 1 /* limit granularity (byte/page units)*/ }, 1049/* GDATA_SEL 2 Data Descriptor for kernel */ 1050{ 0x0, /* segment base address */ 1051 0xfffff, /* length - all address space */ 1052 SDT_MEMRWA, /* segment type */ 1053 0, /* segment descriptor priority level */ 1054 1, /* segment descriptor present */ 1055 0, 0, 1056 1, /* default 32 vs 16 bit size */ 1057 1 /* limit granularity (byte/page units)*/ }, 1058/* GPRIV_SEL 3 SMP Per-Processor Private Data Descriptor */ 1059{ 0x0, /* segment base address */ 1060 0xfffff, /* length - all address space */ 1061 SDT_MEMRWA, /* segment type */ 1062 0, /* segment descriptor priority level */ 1063 1, /* segment descriptor present */ 1064 0, 0, 1065 1, /* default 32 vs 16 bit size */ 1066 1 /* limit granularity (byte/page units)*/ }, 1067/* GPROC0_SEL 4 Proc 0 Tss Descriptor */ 1068{ 1069 0x0, /* segment base address */ 1070 sizeof(struct i386tss)-1,/* length - all address space */ 1071 SDT_SYS386TSS, /* segment type */ 1072 0, /* segment descriptor priority level */ 1073 1, /* segment descriptor present */ 1074 0, 0, 1075 0, /* unused - default 32 vs 16 bit size */ 1076 0 /* limit granularity (byte/page units)*/ }, 1077/* GLDT_SEL 5 LDT Descriptor */ 1078{ (int) ldt, /* segment base address */ 1079 sizeof(ldt)-1, /* length - all address space */ 1080 SDT_SYSLDT, /* segment type */ 1081 SEL_UPL, /* segment descriptor priority level */ 1082 1, /* segment descriptor present */ 1083 0, 0, 1084 0, /* unused - default 32 vs 16 bit size */ 1085 0 /* limit granularity (byte/page units)*/ }, 1086/* GUSERLDT_SEL 6 User LDT Descriptor per process */ 1087{ (int) ldt, /* segment base address */ 1088 (512 * sizeof(union descriptor)-1), /* length */ 1089 SDT_SYSLDT, /* segment type */ 1090 0, /* segment descriptor priority level */ 1091 1, /* segment descriptor present */ 1092 0, 0, 1093 0, /* unused - default 32 vs 16 bit size */ 1094 0 /* limit granularity (byte/page units)*/ }, 1095/* GTGATE_SEL 7 Null Descriptor - Placeholder */ 1096{ 0x0, /* segment base address */ 1097 0x0, /* length - all address space */ 1098 0, /* segment type */ 1099 0, /* segment descriptor priority level */ 1100 0, /* segment descriptor present */ 1101 0, 0, 1102 0, /* default 32 vs 16 bit size */ 1103 0 /* limit granularity (byte/page units)*/ }, 1104/* GBIOSLOWMEM_SEL 8 BIOS access to realmode segment 0x40, must be #8 in GDT */ 1105{ 0x400, /* segment base address */ 1106 0xfffff, /* length */ 1107 SDT_MEMRWA, /* segment type */ 1108 0, /* segment descriptor priority level */ 1109 1, /* segment descriptor present */ 1110 0, 0, 1111 1, /* default 32 vs 16 bit size */ 1112 1 /* limit granularity (byte/page units)*/ }, 1113/* GPANIC_SEL 9 Panic Tss Descriptor */ 1114{ (int) &dblfault_tss, /* segment base address */ 1115 sizeof(struct i386tss)-1,/* length - all address space */ 1116 SDT_SYS386TSS, /* segment type */ 1117 0, /* segment descriptor priority level */ 1118 1, /* segment descriptor present */ 1119 0, 0, 1120 0, /* unused - default 32 vs 16 bit size */ 1121 0 /* limit granularity (byte/page units)*/ }, 1122/* GBIOSCODE32_SEL 10 BIOS 32-bit interface (32bit Code) */ 1123{ 0, /* segment base address (overwritten) */ 1124 0xfffff, /* length */ 1125 SDT_MEMERA, /* segment type */ 1126 0, /* segment descriptor priority level */ 1127 1, /* segment descriptor present */ 1128 0, 0, 1129 0, /* default 32 vs 16 bit size */ 1130 1 /* limit granularity (byte/page units)*/ }, 1131/* GBIOSCODE16_SEL 11 BIOS 32-bit interface (16bit Code) */ 1132{ 0, /* segment base address (overwritten) */ 1133 0xfffff, /* length */ 1134 SDT_MEMERA, /* segment type */ 1135 0, /* segment descriptor priority level */ 1136 1, /* segment descriptor present */ 1137 0, 0, 1138 0, /* default 32 vs 16 bit size */ 1139 1 /* limit granularity (byte/page units)*/ }, 1140/* GBIOSDATA_SEL 12 BIOS 32-bit interface (Data) */ 1141{ 0, /* segment base address (overwritten) */ 1142 0xfffff, /* length */ 1143 SDT_MEMRWA, /* segment type */ 1144 0, /* segment descriptor priority level */ 1145 1, /* segment descriptor present */ 1146 0, 0, 1147 1, /* default 32 vs 16 bit size */ 1148 1 /* limit granularity (byte/page units)*/ }, 1149/* GBIOSUTIL_SEL 13 BIOS 16-bit interface (Utility) */ 1150{ 0, /* segment base address (overwritten) */ 1151 0xfffff, /* length */ 1152 SDT_MEMRWA, /* segment type */ 1153 0, /* segment descriptor priority level */ 1154 1, /* segment descriptor present */ 1155 0, 0, 1156 0, /* default 32 vs 16 bit size */ 1157 1 /* limit granularity (byte/page units)*/ }, 1158/* GBIOSARGS_SEL 14 BIOS 16-bit interface (Arguments) */ 1159{ 0, /* segment base address (overwritten) */ 1160 0xfffff, /* length */ 1161 SDT_MEMRWA, /* segment type */ 1162 0, /* segment descriptor priority level */ 1163 1, /* segment descriptor present */ 1164 0, 0, 1165 0, /* default 32 vs 16 bit size */ 1166 1 /* limit granularity (byte/page units)*/ }, 1167}; 1168 1169static struct soft_segment_descriptor ldt_segs[] = { 1170 /* Null Descriptor - overwritten by call gate */ 1171{ 0x0, /* segment base address */ 1172 0x0, /* length - all address space */ 1173 0, /* segment type */ 1174 0, /* segment descriptor priority level */ 1175 0, /* segment descriptor present */ 1176 0, 0, 1177 0, /* default 32 vs 16 bit size */ 1178 0 /* limit granularity (byte/page units)*/ }, 1179 /* Null Descriptor - overwritten by call gate */ 1180{ 0x0, /* segment base address */ 1181 0x0, /* length - all address space */ 1182 0, /* segment type */ 1183 0, /* segment descriptor priority level */ 1184 0, /* segment descriptor present */ 1185 0, 0, 1186 0, /* default 32 vs 16 bit size */ 1187 0 /* limit granularity (byte/page units)*/ }, 1188 /* Null Descriptor - overwritten by call gate */ 1189{ 0x0, /* segment base address */ 1190 0x0, /* length - all address space */ 1191 0, /* segment type */ 1192 0, /* segment descriptor priority level */ 1193 0, /* segment descriptor present */ 1194 0, 0, 1195 0, /* default 32 vs 16 bit size */ 1196 0 /* limit granularity (byte/page units)*/ }, 1197 /* Code Descriptor for user */ 1198{ 0x0, /* segment base address */ 1199 0xfffff, /* length - all address space */ 1200 SDT_MEMERA, /* segment type */ 1201 SEL_UPL, /* segment descriptor priority level */ 1202 1, /* segment descriptor present */ 1203 0, 0, 1204 1, /* default 32 vs 16 bit size */ 1205 1 /* limit granularity (byte/page units)*/ }, 1206 /* Null Descriptor - overwritten by call gate */ 1207{ 0x0, /* segment base address */ 1208 0x0, /* length - all address space */ 1209 0, /* segment type */ 1210 0, /* segment descriptor priority level */ 1211 0, /* segment descriptor present */ 1212 0, 0, 1213 0, /* default 32 vs 16 bit size */ 1214 0 /* limit granularity (byte/page units)*/ }, 1215 /* Data Descriptor for user */ 1216{ 0x0, /* segment base address */ 1217 0xfffff, /* length - all address space */ 1218 SDT_MEMRWA, /* segment type */ 1219 SEL_UPL, /* segment descriptor priority level */ 1220 1, /* segment descriptor present */ 1221 0, 0, 1222 1, /* default 32 vs 16 bit size */ 1223 1 /* limit granularity (byte/page units)*/ }, 1224}; 1225 1226void 1227setidt(idx, func, typ, dpl, selec) 1228 int idx; 1229 inthand_t *func; 1230 int typ; 1231 int dpl; 1232 int selec; 1233{ 1234 struct gate_descriptor *ip; 1235 1236 ip = idt + idx; 1237 ip->gd_looffset = (int)func; 1238 ip->gd_selector = selec; 1239 ip->gd_stkcpy = 0; 1240 ip->gd_xx = 0; 1241 ip->gd_type = typ; 1242 ip->gd_dpl = dpl; 1243 ip->gd_p = 1; 1244 ip->gd_hioffset = ((int)func)>>16 ; 1245} 1246 1247#define IDTVEC(name) __CONCAT(X,name) 1248 1249extern inthand_t 1250 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 1251 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 1252 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 1253 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 1254 IDTVEC(xmm), IDTVEC(lcall_syscall), IDTVEC(int0x80_syscall); 1255 1256void 1257sdtossd(sd, ssd) 1258 struct segment_descriptor *sd; 1259 struct soft_segment_descriptor *ssd; 1260{ 1261 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 1262 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 1263 ssd->ssd_type = sd->sd_type; 1264 ssd->ssd_dpl = sd->sd_dpl; 1265 ssd->ssd_p = sd->sd_p; 1266 ssd->ssd_def32 = sd->sd_def32; 1267 ssd->ssd_gran = sd->sd_gran; 1268} 1269 1270#define PHYSMAP_SIZE (2 * 8) 1271 1272/* 1273 * Populate the (physmap) array with base/bound pairs describing the 1274 * available physical memory in the system, then test this memory and 1275 * build the phys_avail array describing the actually-available memory. 1276 * 1277 * If we cannot accurately determine the physical memory map, then use 1278 * value from the 0xE801 call, and failing that, the RTC. 1279 * 1280 * Total memory size may be set by the kernel environment variable 1281 * hw.physmem or the compile-time define MAXMEM. 1282 */ 1283static void 1284getmemsize(int first) 1285{ 1286 int i, physmap_idx, pa_indx; 1287 u_int basemem, extmem; 1288 struct vm86frame vmf; 1289 struct vm86context vmc; 1290 vm_offset_t pa, physmap[PHYSMAP_SIZE]; 1291 pt_entry_t pte; 1292 const char *cp; 1293 struct bios_smap *smap; 1294 1295 bzero(&vmf, sizeof(struct vm86frame)); 1296 bzero(physmap, sizeof(physmap)); 1297 1298 /* 1299 * Perform "base memory" related probes & setup 1300 */ 1301 vm86_intcall(0x12, &vmf); 1302 basemem = vmf.vmf_ax; 1303 if (basemem > 640) { 1304 printf("Preposterous BIOS basemem of %uK, truncating to 640K\n", 1305 basemem); 1306 basemem = 640; 1307 } 1308 1309 /* 1310 * XXX if biosbasemem is now < 640, there is a `hole' 1311 * between the end of base memory and the start of 1312 * ISA memory. The hole may be empty or it may 1313 * contain BIOS code or data. Map it read/write so 1314 * that the BIOS can write to it. (Memory from 0 to 1315 * the physical end of the kernel is mapped read-only 1316 * to begin with and then parts of it are remapped. 1317 * The parts that aren't remapped form holes that 1318 * remain read-only and are unused by the kernel. 1319 * The base memory area is below the physical end of 1320 * the kernel and right now forms a read-only hole. 1321 * The part of it from PAGE_SIZE to 1322 * (trunc_page(biosbasemem * 1024) - 1) will be 1323 * remapped and used by the kernel later.) 1324 * 1325 * This code is similar to the code used in 1326 * pmap_mapdev, but since no memory needs to be 1327 * allocated we simply change the mapping. 1328 */ 1329 for (pa = trunc_page(basemem * 1024); 1330 pa < ISA_HOLE_START; pa += PAGE_SIZE) { 1331 pte = (pt_entry_t)vtopte(pa + KERNBASE); 1332 *pte = pa | PG_RW | PG_V; 1333 } 1334 1335 /* 1336 * if basemem != 640, map pages r/w into vm86 page table so 1337 * that the bios can scribble on it. 1338 */ 1339 pte = (pt_entry_t)vm86paddr; 1340 for (i = basemem / 4; i < 160; i++) 1341 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U; 1342 1343 /* 1344 * map page 1 R/W into the kernel page table so we can use it 1345 * as a buffer. The kernel will unmap this page later. 1346 */ 1347 pte = (pt_entry_t)vtopte(KERNBASE + (1 << PAGE_SHIFT)); 1348 *pte = (1 << PAGE_SHIFT) | PG_RW | PG_V; 1349 1350 /* 1351 * get memory map with INT 15:E820 1352 */ 1353 vmc.npages = 0; 1354 smap = (void *)vm86_addpage(&vmc, 1, KERNBASE + (1 << PAGE_SHIFT)); 1355 vm86_getptr(&vmc, (vm_offset_t)smap, &vmf.vmf_es, &vmf.vmf_di); 1356 1357 physmap_idx = 0; 1358 vmf.vmf_ebx = 0; 1359 do { 1360 vmf.vmf_eax = 0xE820; 1361 vmf.vmf_edx = SMAP_SIG; 1362 vmf.vmf_ecx = sizeof(struct bios_smap); 1363 i = vm86_datacall(0x15, &vmf, &vmc); 1364 if (i || vmf.vmf_eax != SMAP_SIG) 1365 break; 1366 if (boothowto & RB_VERBOSE) 1367 printf("SMAP type=%02x base=%08x %08x len=%08x %08x\n", 1368 smap->type, 1369 *(u_int32_t *)((char *)&smap->base + 4), 1370 (u_int32_t)smap->base, 1371 *(u_int32_t *)((char *)&smap->length + 4), 1372 (u_int32_t)smap->length); 1373 1374 if (smap->type != 0x01) 1375 goto next_run; 1376 1377 if (smap->length == 0) 1378 goto next_run; 1379 1380 if (smap->base >= 0xffffffff) { 1381 printf("%uK of memory above 4GB ignored\n", 1382 (u_int)(smap->length / 1024)); 1383 goto next_run; 1384 } 1385 1386 for (i = 0; i <= physmap_idx; i += 2) { 1387 if (smap->base < physmap[i + 1]) { 1388 if (boothowto & RB_VERBOSE) 1389 printf( 1390 "Overlapping or non-montonic memory region, ignoring second region\n"); 1391 goto next_run; 1392 } 1393 } 1394 1395 if (smap->base == physmap[physmap_idx + 1]) { 1396 physmap[physmap_idx + 1] += smap->length; 1397 goto next_run; 1398 } 1399 1400 physmap_idx += 2; 1401 if (physmap_idx == PHYSMAP_SIZE) { 1402 printf( 1403 "Too many segments in the physical address map, giving up\n"); 1404 break; 1405 } 1406 physmap[physmap_idx] = smap->base; 1407 physmap[physmap_idx + 1] = smap->base + smap->length; 1408next_run: 1409 } while (vmf.vmf_ebx != 0); 1410 1411 if (physmap[1] != 0) 1412 goto physmap_done; 1413 1414 /* 1415 * If we failed above, try memory map with INT 15:E801 1416 */ 1417 vmf.vmf_ax = 0xE801; 1418 if (vm86_intcall(0x15, &vmf) == 0) { 1419 extmem = vmf.vmf_cx + vmf.vmf_dx * 64; 1420 } else { 1421#if 0 1422 vmf.vmf_ah = 0x88; 1423 vm86_intcall(0x15, &vmf); 1424 extmem = vmf.vmf_ax; 1425#else 1426 /* 1427 * Prefer the RTC value for extended memory. 1428 */ 1429 extmem = rtcin(RTC_EXTLO) + (rtcin(RTC_EXTHI) << 8); 1430#endif 1431 } 1432 1433 /* 1434 * Special hack for chipsets that still remap the 384k hole when 1435 * there's 16MB of memory - this really confuses people that 1436 * are trying to use bus mastering ISA controllers with the 1437 * "16MB limit"; they only have 16MB, but the remapping puts 1438 * them beyond the limit. 1439 * 1440 * If extended memory is between 15-16MB (16-17MB phys address range), 1441 * chop it to 15MB. 1442 */ 1443 if ((extmem > 15 * 1024) && (extmem < 16 * 1024)) 1444 extmem = 15 * 1024; 1445 1446 physmap[0] = 0; 1447 physmap[1] = basemem * 1024; 1448 physmap_idx = 2; 1449 physmap[physmap_idx] = 0x100000; 1450 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024; 1451 1452physmap_done: 1453 /* 1454 * Now, physmap contains a map of physical memory. 1455 */ 1456 1457#ifdef SMP 1458 /* make hole for AP bootstrap code */ 1459 physmap[1] = mp_bootaddress(physmap[1] / 1024); 1460 1461 /* look for the MP hardware - needed for apic addresses */ 1462 i386_mp_probe(); 1463#endif 1464 1465 /* 1466 * Maxmem isn't the "maximum memory", it's one larger than the 1467 * highest page of the physical address space. It should be 1468 * called something like "Maxphyspage". We may adjust this 1469 * based on ``hw.physmem'' and the results of the memory test. 1470 */ 1471 Maxmem = atop(physmap[physmap_idx + 1]); 1472 1473#ifdef MAXMEM 1474 Maxmem = MAXMEM / 4; 1475#endif 1476 1477 /* 1478 * hw.physmem is a size in bytes; we also allow k, m, and g suffixes 1479 * for the appropriate modifiers. This overrides MAXMEM. 1480 */ 1481 if ((cp = getenv("hw.physmem")) != NULL) { 1482 u_int64_t AllowMem, sanity; 1483 char *ep; 1484 1485 sanity = AllowMem = strtouq(cp, &ep, 0); 1486 if ((ep != cp) && (*ep != 0)) { 1487 switch(*ep) { 1488 case 'g': 1489 case 'G': 1490 AllowMem <<= 10; 1491 case 'm': 1492 case 'M': 1493 AllowMem <<= 10; 1494 case 'k': 1495 case 'K': 1496 AllowMem <<= 10; 1497 break; 1498 default: 1499 AllowMem = sanity = 0; 1500 } 1501 if (AllowMem < sanity) 1502 AllowMem = 0; 1503 } 1504 if (AllowMem == 0) 1505 printf("Ignoring invalid memory size of '%s'\n", cp); 1506 else 1507 Maxmem = atop(AllowMem); 1508 } 1509 1510 if (atop(physmap[physmap_idx + 1]) != Maxmem && 1511 (boothowto & RB_VERBOSE)) 1512 printf("Physical memory use set to %uK\n", Maxmem * 4); 1513 1514 /* 1515 * If Maxmem has been increased beyond what the system has detected, 1516 * extend the last memory segment to the new limit. 1517 */ 1518 if (atop(physmap[physmap_idx + 1]) < Maxmem) 1519 physmap[physmap_idx + 1] = ptoa(Maxmem); 1520 1521 /* call pmap initialization to make new kernel address space */ 1522 pmap_bootstrap(first, 0); 1523 1524 /* 1525 * Size up each available chunk of physical memory. 1526 */ 1527 physmap[0] = PAGE_SIZE; /* mask off page 0 */ 1528 pa_indx = 0; 1529 phys_avail[pa_indx++] = physmap[0]; 1530 phys_avail[pa_indx] = physmap[0]; 1531#if 0 1532 pte = (pt_entry_t)vtopte(KERNBASE); 1533#else 1534 pte = (pt_entry_t)CMAP1; 1535#endif 1536 1537 /* 1538 * physmap is in bytes, so when converting to page boundaries, 1539 * round up the start address and round down the end address. 1540 */ 1541 for (i = 0; i <= physmap_idx; i += 2) { 1542 vm_offset_t end; 1543 1544 end = ptoa(Maxmem); 1545 if (physmap[i + 1] < end) 1546 end = trunc_page(physmap[i + 1]); 1547 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) { 1548 int tmp, page_bad; 1549#if 0 1550 int *ptr = 0; 1551#else 1552 int *ptr = (int *)CADDR1; 1553#endif 1554 1555 /* 1556 * block out kernel memory as not available. 1557 */ 1558 if (pa >= 0x100000 && pa < first) 1559 continue; 1560 1561 page_bad = FALSE; 1562 1563 /* 1564 * map page into kernel: valid, read/write,non-cacheable 1565 */ 1566 *pte = pa | PG_V | PG_RW | PG_N; 1567 invltlb(); 1568 1569 tmp = *(int *)ptr; 1570 /* 1571 * Test for alternating 1's and 0's 1572 */ 1573 *(volatile int *)ptr = 0xaaaaaaaa; 1574 if (*(volatile int *)ptr != 0xaaaaaaaa) { 1575 page_bad = TRUE; 1576 } 1577 /* 1578 * Test for alternating 0's and 1's 1579 */ 1580 *(volatile int *)ptr = 0x55555555; 1581 if (*(volatile int *)ptr != 0x55555555) { 1582 page_bad = TRUE; 1583 } 1584 /* 1585 * Test for all 1's 1586 */ 1587 *(volatile int *)ptr = 0xffffffff; 1588 if (*(volatile int *)ptr != 0xffffffff) { 1589 page_bad = TRUE; 1590 } 1591 /* 1592 * Test for all 0's 1593 */ 1594 *(volatile int *)ptr = 0x0; 1595 if (*(volatile int *)ptr != 0x0) { 1596 page_bad = TRUE; 1597 } 1598 /* 1599 * Restore original value. 1600 */ 1601 *(int *)ptr = tmp; 1602 1603 /* 1604 * Adjust array of valid/good pages. 1605 */ 1606 if (page_bad == TRUE) { 1607 continue; 1608 } 1609 /* 1610 * If this good page is a continuation of the 1611 * previous set of good pages, then just increase 1612 * the end pointer. Otherwise start a new chunk. 1613 * Note that "end" points one higher than end, 1614 * making the range >= start and < end. 1615 * If we're also doing a speculative memory 1616 * test and we at or past the end, bump up Maxmem 1617 * so that we keep going. The first bad page 1618 * will terminate the loop. 1619 */ 1620 if (phys_avail[pa_indx] == pa) { 1621 phys_avail[pa_indx] += PAGE_SIZE; 1622 } else { 1623 pa_indx++; 1624 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 1625 printf( 1626 "Too many holes in the physical address space, giving up\n"); 1627 pa_indx--; 1628 break; 1629 } 1630 phys_avail[pa_indx++] = pa; /* start */ 1631 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */ 1632 } 1633 physmem++; 1634 } 1635 } 1636 *pte = 0; 1637 invltlb(); 1638 1639 /* 1640 * XXX 1641 * The last chunk must contain at least one page plus the message 1642 * buffer to avoid complicating other code (message buffer address 1643 * calculation, etc.). 1644 */ 1645 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 1646 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) { 1647 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 1648 phys_avail[pa_indx--] = 0; 1649 phys_avail[pa_indx--] = 0; 1650 } 1651 1652 Maxmem = atop(phys_avail[pa_indx]); 1653 1654 /* Trim off space for the message buffer. */ 1655 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE); 1656 1657 avail_end = phys_avail[pa_indx]; 1658} 1659 1660void 1661init386(first) 1662 int first; 1663{ 1664 struct gate_descriptor *gdp; 1665 int gsel_tss, metadata_missing, off, x; 1666#ifndef SMP 1667 /* table descriptors - used to load tables by microp */ 1668 struct region_descriptor r_gdt, r_idt; 1669#endif 1670 1671 proc_linkup(&proc0); 1672 proc0.p_uarea = proc0uarea; 1673 thread0 = &proc0.p_thread; 1674 thread0->td_kstack = proc0kstack; 1675 thread0->td_pcb = (struct pcb *) 1676 (thread0->td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1; 1677 atdevbase = ISA_HOLE_START + KERNBASE; 1678 1679 metadata_missing = 0; 1680 if (bootinfo.bi_modulep) { 1681 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE; 1682 preload_bootstrap_relocate(KERNBASE); 1683 } else { 1684 metadata_missing = 1; 1685 } 1686 if (envmode == 1) 1687 kern_envp = static_env; 1688 else if (bootinfo.bi_envp) 1689 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE; 1690 1691 /* Init basic tunables, hz etc */ 1692 init_param(); 1693 1694 /* 1695 * make gdt memory segments, the code segment goes up to end of the 1696 * page with etext in it, the data segment goes to the end of 1697 * the address space 1698 */ 1699 /* 1700 * XXX text protection is temporarily (?) disabled. The limit was 1701 * i386_btop(round_page(etext)) - 1. 1702 */ 1703 gdt_segs[GCODE_SEL].ssd_limit = atop(0 - 1); 1704 gdt_segs[GDATA_SEL].ssd_limit = atop(0 - 1); 1705#ifdef SMP 1706 gdt_segs[GPRIV_SEL].ssd_limit = 1707 atop(sizeof(struct privatespace) - 1); 1708 gdt_segs[GPRIV_SEL].ssd_base = (int) &SMP_prvspace[0]; 1709 gdt_segs[GPROC0_SEL].ssd_base = 1710 (int) &SMP_prvspace[0].globaldata.gd_common_tss; 1711 SMP_prvspace[0].globaldata.gd_prvspace = &SMP_prvspace[0].globaldata; 1712#else 1713 gdt_segs[GPRIV_SEL].ssd_limit = 1714 atop(sizeof(struct globaldata) - 1); 1715 gdt_segs[GPRIV_SEL].ssd_base = (int) &__globaldata; 1716 gdt_segs[GPROC0_SEL].ssd_base = 1717 (int) &__globaldata.gd_common_tss; 1718 __globaldata.gd_prvspace = &__globaldata; 1719#endif 1720 1721 for (x = 0; x < NGDT; x++) { 1722#ifdef BDE_DEBUGGER 1723 /* avoid overwriting db entries with APM ones */ 1724 if (x >= GAPMCODE32_SEL && x <= GAPMDATA_SEL) 1725 continue; 1726#endif 1727 ssdtosd(&gdt_segs[x], &gdt[x].sd); 1728 } 1729 1730 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1; 1731 r_gdt.rd_base = (int) gdt; 1732 lgdt(&r_gdt); 1733 1734 /* setup curproc so that mutexes work */ 1735 1736 PCPU_SET(curthread, thread0); 1737 PCPU_SET(spinlocks, NULL); 1738 1739 LIST_INIT(&thread0->td_contested); 1740 1741 /* 1742 * Initialize mutexes. 1743 */ 1744 mtx_init(&Giant, "Giant", MTX_DEF | MTX_RECURSE); 1745 mtx_init(&sched_lock, "sched lock", MTX_SPIN | MTX_RECURSE); 1746 mtx_init(&proc0.p_mtx, "process lock", MTX_DEF); 1747 mtx_init(&clock_lock, "clk", MTX_SPIN | MTX_RECURSE); 1748#ifdef SMP 1749 mtx_init(&imen_mtx, "imen", MTX_SPIN); 1750#endif 1751 mtx_lock(&Giant); 1752 1753 /* make ldt memory segments */ 1754 /* 1755 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it 1756 * should be spelled ...MAX_USER... 1757 */ 1758 ldt_segs[LUCODE_SEL].ssd_limit = atop(VM_MAXUSER_ADDRESS - 1); 1759 ldt_segs[LUDATA_SEL].ssd_limit = atop(VM_MAXUSER_ADDRESS - 1); 1760 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++) 1761 ssdtosd(&ldt_segs[x], &ldt[x].sd); 1762 1763 _default_ldt = GSEL(GLDT_SEL, SEL_KPL); 1764 lldt(_default_ldt); 1765 PCPU_SET(currentldt, _default_ldt); 1766 1767 /* exceptions */ 1768 for (x = 0; x < NIDT; x++) 1769 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, 1770 GSEL(GCODE_SEL, SEL_KPL)); 1771 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, 1772 GSEL(GCODE_SEL, SEL_KPL)); 1773 setidt(1, &IDTVEC(dbg), SDT_SYS386IGT, SEL_KPL, 1774 GSEL(GCODE_SEL, SEL_KPL)); 1775 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, 1776 GSEL(GCODE_SEL, SEL_KPL)); 1777 setidt(3, &IDTVEC(bpt), SDT_SYS386IGT, SEL_UPL, 1778 GSEL(GCODE_SEL, SEL_KPL)); 1779 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, 1780 GSEL(GCODE_SEL, SEL_KPL)); 1781 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, 1782 GSEL(GCODE_SEL, SEL_KPL)); 1783 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, 1784 GSEL(GCODE_SEL, SEL_KPL)); 1785 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL 1786 , GSEL(GCODE_SEL, SEL_KPL)); 1787 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL)); 1788 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, 1789 GSEL(GCODE_SEL, SEL_KPL)); 1790 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, 1791 GSEL(GCODE_SEL, SEL_KPL)); 1792 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, 1793 GSEL(GCODE_SEL, SEL_KPL)); 1794 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, 1795 GSEL(GCODE_SEL, SEL_KPL)); 1796 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, 1797 GSEL(GCODE_SEL, SEL_KPL)); 1798 setidt(14, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL, 1799 GSEL(GCODE_SEL, SEL_KPL)); 1800 setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, 1801 GSEL(GCODE_SEL, SEL_KPL)); 1802 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, 1803 GSEL(GCODE_SEL, SEL_KPL)); 1804 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, 1805 GSEL(GCODE_SEL, SEL_KPL)); 1806 setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, 1807 GSEL(GCODE_SEL, SEL_KPL)); 1808 setidt(19, &IDTVEC(xmm), SDT_SYS386TGT, SEL_KPL, 1809 GSEL(GCODE_SEL, SEL_KPL)); 1810 setidt(0x80, &IDTVEC(int0x80_syscall), SDT_SYS386TGT, SEL_UPL, 1811 GSEL(GCODE_SEL, SEL_KPL)); 1812 1813 r_idt.rd_limit = sizeof(idt0) - 1; 1814 r_idt.rd_base = (int) idt; 1815 lidt(&r_idt); 1816 1817 /* 1818 * Initialize the console before we print anything out. 1819 */ 1820 cninit(); 1821 1822 if (metadata_missing) 1823 printf("WARNING: loader(8) metadata is missing!\n"); 1824 1825#ifdef DEV_ISA 1826 isa_defaultirq(); 1827#endif 1828 1829#ifdef DDB 1830 kdb_init(); 1831 if (boothowto & RB_KDB) 1832 Debugger("Boot flags requested debugger"); 1833#endif 1834 1835 finishidentcpu(); /* Final stage of CPU initialization */ 1836 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, 1837 GSEL(GCODE_SEL, SEL_KPL)); 1838 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, 1839 GSEL(GCODE_SEL, SEL_KPL)); 1840 initializecpu(); /* Initialize CPU registers */ 1841 1842 /* make an initial tss so cpu can get interrupt stack on syscall! */ 1843 /* Note: -16 is so we can grow the trapframe if we came from vm86 */ 1844 PCPU_SET(common_tss.tss_esp0, thread0->td_kstack + 1845 KSTACK_PAGES * PAGE_SIZE - sizeof(struct pcb) - 16); 1846 PCPU_SET(common_tss.tss_ss0, GSEL(GDATA_SEL, SEL_KPL)); 1847 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 1848 private_tss = 0; 1849 PCPU_SET(tss_gdt, &gdt[GPROC0_SEL].sd); 1850 PCPU_SET(common_tssd, *PCPU_GET(tss_gdt)); 1851 PCPU_SET(common_tss.tss_ioopt, (sizeof (struct i386tss)) << 16); 1852 ltr(gsel_tss); 1853 1854 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 = 1855 dblfault_tss.tss_esp2 = (int)&dblfault_stack[sizeof(dblfault_stack)]; 1856 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 = 1857 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL); 1858 dblfault_tss.tss_cr3 = (int)IdlePTD; 1859 dblfault_tss.tss_eip = (int)dblfault_handler; 1860 dblfault_tss.tss_eflags = PSL_KERNEL; 1861 dblfault_tss.tss_ds = dblfault_tss.tss_es = 1862 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL); 1863 dblfault_tss.tss_fs = GSEL(GPRIV_SEL, SEL_KPL); 1864 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL); 1865 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL); 1866 1867 vm86_initialize(); 1868 getmemsize(first); 1869 1870 /* now running on new page tables, configured,and u/iom is accessible */ 1871 1872 /* Map the message buffer. */ 1873 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE) 1874 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off); 1875 1876 msgbufinit(msgbufp, MSGBUF_SIZE); 1877 1878 /* make a call gate to reenter kernel with */ 1879 gdp = &ldt[LSYS5CALLS_SEL].gd; 1880 1881 x = (int) &IDTVEC(lcall_syscall); 1882 gdp->gd_looffset = x; 1883 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL); 1884 gdp->gd_stkcpy = 1; 1885 gdp->gd_type = SDT_SYS386CGT; 1886 gdp->gd_dpl = SEL_UPL; 1887 gdp->gd_p = 1; 1888 gdp->gd_hioffset = x >> 16; 1889 1890 /* XXX does this work? */ 1891 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL]; 1892 ldt[LSOL26CALLS_SEL] = ldt[LSYS5CALLS_SEL]; 1893 1894 /* transfer to user mode */ 1895 1896 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL); 1897 _udatasel = LSEL(LUDATA_SEL, SEL_UPL); 1898 1899 /* setup proc 0's pcb */ 1900 thread0->td_pcb->pcb_flags = 0; /* XXXKSE */ 1901 thread0->td_pcb->pcb_cr3 = (int)IdlePTD; 1902 thread0->td_pcb->pcb_ext = 0; 1903 thread0->td_frame = &proc0_tf; 1904} 1905 1906#if defined(I586_CPU) && !defined(NO_F00F_HACK) 1907static void f00f_hack(void *unused); 1908SYSINIT(f00f_hack, SI_SUB_INTRINSIC, SI_ORDER_FIRST, f00f_hack, NULL); 1909 1910static void 1911f00f_hack(void *unused) { 1912 struct gate_descriptor *new_idt; 1913#ifndef SMP 1914 struct region_descriptor r_idt; 1915#endif 1916 vm_offset_t tmp; 1917 1918 if (!has_f00f_bug) 1919 return; 1920 1921 GIANT_REQUIRED; 1922 1923 printf("Intel Pentium detected, installing workaround for F00F bug\n"); 1924 1925 r_idt.rd_limit = sizeof(idt0) - 1; 1926 1927 tmp = kmem_alloc(kernel_map, PAGE_SIZE * 2); 1928 if (tmp == 0) 1929 panic("kmem_alloc returned 0"); 1930 if (((unsigned int)tmp & (PAGE_SIZE-1)) != 0) 1931 panic("kmem_alloc returned non-page-aligned memory"); 1932 /* Put the first seven entries in the lower page */ 1933 new_idt = (struct gate_descriptor*)(tmp + PAGE_SIZE - (7*8)); 1934 bcopy(idt, new_idt, sizeof(idt0)); 1935 r_idt.rd_base = (int)new_idt; 1936 lidt(&r_idt); 1937 idt = new_idt; 1938 if (vm_map_protect(kernel_map, tmp, tmp + PAGE_SIZE, 1939 VM_PROT_READ, FALSE) != KERN_SUCCESS) 1940 panic("vm_map_protect failed"); 1941 return; 1942} 1943#endif /* defined(I586_CPU) && !NO_F00F_HACK */ 1944 1945int 1946ptrace_set_pc(struct thread *td, unsigned long addr) 1947{ 1948 td->td_frame->tf_eip = addr; 1949 return (0); 1950} 1951 1952int 1953ptrace_single_step(struct thread *td) 1954{ 1955 td->td_frame->tf_eflags |= PSL_T; 1956 return (0); 1957} 1958 1959int 1960fill_regs(struct thread *td, struct reg *regs) 1961{ 1962 struct pcb *pcb; 1963 struct trapframe *tp; 1964 1965 tp = td->td_frame; 1966 regs->r_fs = tp->tf_fs; 1967 regs->r_es = tp->tf_es; 1968 regs->r_ds = tp->tf_ds; 1969 regs->r_edi = tp->tf_edi; 1970 regs->r_esi = tp->tf_esi; 1971 regs->r_ebp = tp->tf_ebp; 1972 regs->r_ebx = tp->tf_ebx; 1973 regs->r_edx = tp->tf_edx; 1974 regs->r_ecx = tp->tf_ecx; 1975 regs->r_eax = tp->tf_eax; 1976 regs->r_eip = tp->tf_eip; 1977 regs->r_cs = tp->tf_cs; 1978 regs->r_eflags = tp->tf_eflags; 1979 regs->r_esp = tp->tf_esp; 1980 regs->r_ss = tp->tf_ss; 1981 pcb = td->td_pcb; 1982 regs->r_gs = pcb->pcb_gs; 1983 return (0); 1984} 1985 1986int 1987set_regs(struct thread *td, struct reg *regs) 1988{ 1989 struct pcb *pcb; 1990 struct trapframe *tp; 1991 1992 tp = td->td_frame; 1993 if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) || 1994 !CS_SECURE(regs->r_cs)) 1995 return (EINVAL); 1996 tp->tf_fs = regs->r_fs; 1997 tp->tf_es = regs->r_es; 1998 tp->tf_ds = regs->r_ds; 1999 tp->tf_edi = regs->r_edi; 2000 tp->tf_esi = regs->r_esi; 2001 tp->tf_ebp = regs->r_ebp; 2002 tp->tf_ebx = regs->r_ebx; 2003 tp->tf_edx = regs->r_edx; 2004 tp->tf_ecx = regs->r_ecx; 2005 tp->tf_eax = regs->r_eax; 2006 tp->tf_eip = regs->r_eip; 2007 tp->tf_cs = regs->r_cs; 2008 tp->tf_eflags = regs->r_eflags; 2009 tp->tf_esp = regs->r_esp; 2010 tp->tf_ss = regs->r_ss; 2011 pcb = td->td_pcb; 2012 pcb->pcb_gs = regs->r_gs; 2013 return (0); 2014} 2015 2016#ifdef CPU_ENABLE_SSE 2017static void 2018fill_fpregs_xmm(sv_xmm, sv_87) 2019 struct savexmm *sv_xmm; 2020 struct save87 *sv_87; 2021{ 2022 register struct env87 *penv_87 = &sv_87->sv_env; 2023 register struct envxmm *penv_xmm = &sv_xmm->sv_env; 2024 int i; 2025 2026 /* FPU control/status */ 2027 penv_87->en_cw = penv_xmm->en_cw; 2028 penv_87->en_sw = penv_xmm->en_sw; 2029 penv_87->en_tw = penv_xmm->en_tw; 2030 penv_87->en_fip = penv_xmm->en_fip; 2031 penv_87->en_fcs = penv_xmm->en_fcs; 2032 penv_87->en_opcode = penv_xmm->en_opcode; 2033 penv_87->en_foo = penv_xmm->en_foo; 2034 penv_87->en_fos = penv_xmm->en_fos; 2035 2036 /* FPU registers */ 2037 for (i = 0; i < 8; ++i) 2038 sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc; 2039 2040 sv_87->sv_ex_sw = sv_xmm->sv_ex_sw; 2041} 2042 2043static void 2044set_fpregs_xmm(sv_87, sv_xmm) 2045 struct save87 *sv_87; 2046 struct savexmm *sv_xmm; 2047{ 2048 register struct env87 *penv_87 = &sv_87->sv_env; 2049 register struct envxmm *penv_xmm = &sv_xmm->sv_env; 2050 int i; 2051 2052 /* FPU control/status */ 2053 penv_xmm->en_cw = penv_87->en_cw; 2054 penv_xmm->en_sw = penv_87->en_sw; 2055 penv_xmm->en_tw = penv_87->en_tw; 2056 penv_xmm->en_fip = penv_87->en_fip; 2057 penv_xmm->en_fcs = penv_87->en_fcs; 2058 penv_xmm->en_opcode = penv_87->en_opcode; 2059 penv_xmm->en_foo = penv_87->en_foo; 2060 penv_xmm->en_fos = penv_87->en_fos; 2061 2062 /* FPU registers */ 2063 for (i = 0; i < 8; ++i) 2064 sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i]; 2065 2066 sv_xmm->sv_ex_sw = sv_87->sv_ex_sw; 2067} 2068#endif /* CPU_ENABLE_SSE */ 2069 2070int 2071fill_fpregs(struct thread *td, struct fpreg *fpregs) 2072{ 2073#ifdef CPU_ENABLE_SSE 2074 if (cpu_fxsr) { 2075 fill_fpregs_xmm(&td->td_pcb->pcb_save.sv_xmm, 2076 (struct save87 *)fpregs); 2077 return (0); 2078 } 2079#endif /* CPU_ENABLE_SSE */ 2080 bcopy(&td->td_pcb->pcb_save.sv_87, fpregs, sizeof *fpregs); 2081 return (0); 2082} 2083 2084int 2085set_fpregs(struct thread *td, struct fpreg *fpregs) 2086{ 2087#ifdef CPU_ENABLE_SSE 2088 if (cpu_fxsr) { 2089 set_fpregs_xmm((struct save87 *)fpregs, 2090 &td->td_pcb->pcb_save.sv_xmm); 2091 return (0); 2092 } 2093#endif /* CPU_ENABLE_SSE */ 2094 bcopy(fpregs, &td->td_pcb->pcb_save.sv_87, sizeof *fpregs); 2095 return (0); 2096} 2097 2098int 2099fill_dbregs(struct thread *td, struct dbreg *dbregs) 2100{ 2101 struct pcb *pcb; 2102 2103 if (td == NULL) { 2104 dbregs->dr0 = rdr0(); 2105 dbregs->dr1 = rdr1(); 2106 dbregs->dr2 = rdr2(); 2107 dbregs->dr3 = rdr3(); 2108 dbregs->dr4 = rdr4(); 2109 dbregs->dr5 = rdr5(); 2110 dbregs->dr6 = rdr6(); 2111 dbregs->dr7 = rdr7(); 2112 } else { 2113 pcb = td->td_pcb; 2114 dbregs->dr0 = pcb->pcb_dr0; 2115 dbregs->dr1 = pcb->pcb_dr1; 2116 dbregs->dr2 = pcb->pcb_dr2; 2117 dbregs->dr3 = pcb->pcb_dr3; 2118 dbregs->dr4 = 0; 2119 dbregs->dr5 = 0; 2120 dbregs->dr6 = pcb->pcb_dr6; 2121 dbregs->dr7 = pcb->pcb_dr7; 2122 } 2123 return (0); 2124} 2125 2126int 2127set_dbregs(struct thread *td, struct dbreg *dbregs) 2128{ 2129 struct pcb *pcb; 2130 int i; 2131 u_int32_t mask1, mask2; 2132 2133 if (td == NULL) { 2134 load_dr0(dbregs->dr0); 2135 load_dr1(dbregs->dr1); 2136 load_dr2(dbregs->dr2); 2137 load_dr3(dbregs->dr3); 2138 load_dr4(dbregs->dr4); 2139 load_dr5(dbregs->dr5); 2140 load_dr6(dbregs->dr6); 2141 load_dr7(dbregs->dr7); 2142 } else { 2143 /* 2144 * Don't let an illegal value for dr7 get set. Specifically, 2145 * check for undefined settings. Setting these bit patterns 2146 * result in undefined behaviour and can lead to an unexpected 2147 * TRCTRAP. 2148 */ 2149 for (i = 0, mask1 = 0x3<<16, mask2 = 0x2<<16; i < 8; 2150 i++, mask1 <<= 2, mask2 <<= 2) 2151 if ((dbregs->dr7 & mask1) == mask2) 2152 return (EINVAL); 2153 2154 pcb = td->td_pcb; 2155 2156 /* 2157 * Don't let a process set a breakpoint that is not within the 2158 * process's address space. If a process could do this, it 2159 * could halt the system by setting a breakpoint in the kernel 2160 * (if ddb was enabled). Thus, we need to check to make sure 2161 * that no breakpoints are being enabled for addresses outside 2162 * process's address space, unless, perhaps, we were called by 2163 * uid 0. 2164 * 2165 * XXX - what about when the watched area of the user's 2166 * address space is written into from within the kernel 2167 * ... wouldn't that still cause a breakpoint to be generated 2168 * from within kernel mode? 2169 */ 2170 2171 if (suser_td(td) != 0) { 2172 if (dbregs->dr7 & 0x3) { 2173 /* dr0 is enabled */ 2174 if (dbregs->dr0 >= VM_MAXUSER_ADDRESS) 2175 return (EINVAL); 2176 } 2177 2178 if (dbregs->dr7 & (0x3<<2)) { 2179 /* dr1 is enabled */ 2180 if (dbregs->dr1 >= VM_MAXUSER_ADDRESS) 2181 return (EINVAL); 2182 } 2183 2184 if (dbregs->dr7 & (0x3<<4)) { 2185 /* dr2 is enabled */ 2186 if (dbregs->dr2 >= VM_MAXUSER_ADDRESS) 2187 return (EINVAL); 2188 } 2189 2190 if (dbregs->dr7 & (0x3<<6)) { 2191 /* dr3 is enabled */ 2192 if (dbregs->dr3 >= VM_MAXUSER_ADDRESS) 2193 return (EINVAL); 2194 } 2195 } 2196 2197 pcb->pcb_dr0 = dbregs->dr0; 2198 pcb->pcb_dr1 = dbregs->dr1; 2199 pcb->pcb_dr2 = dbregs->dr2; 2200 pcb->pcb_dr3 = dbregs->dr3; 2201 pcb->pcb_dr6 = dbregs->dr6; 2202 pcb->pcb_dr7 = dbregs->dr7; 2203 2204 pcb->pcb_flags |= PCB_DBREGS; 2205 } 2206 2207 return (0); 2208} 2209 2210/* 2211 * Return > 0 if a hardware breakpoint has been hit, and the 2212 * breakpoint was in user space. Return 0, otherwise. 2213 */ 2214int 2215user_dbreg_trap(void) 2216{ 2217 u_int32_t dr7, dr6; /* debug registers dr6 and dr7 */ 2218 u_int32_t bp; /* breakpoint bits extracted from dr6 */ 2219 int nbp; /* number of breakpoints that triggered */ 2220 caddr_t addr[4]; /* breakpoint addresses */ 2221 int i; 2222 2223 dr7 = rdr7(); 2224 if ((dr7 & 0x000000ff) == 0) { 2225 /* 2226 * all GE and LE bits in the dr7 register are zero, 2227 * thus the trap couldn't have been caused by the 2228 * hardware debug registers 2229 */ 2230 return 0; 2231 } 2232 2233 nbp = 0; 2234 dr6 = rdr6(); 2235 bp = dr6 & 0x0000000f; 2236 2237 if (!bp) { 2238 /* 2239 * None of the breakpoint bits are set meaning this 2240 * trap was not caused by any of the debug registers 2241 */ 2242 return 0; 2243 } 2244 2245 /* 2246 * at least one of the breakpoints were hit, check to see 2247 * which ones and if any of them are user space addresses 2248 */ 2249 2250 if (bp & 0x01) { 2251 addr[nbp++] = (caddr_t)rdr0(); 2252 } 2253 if (bp & 0x02) { 2254 addr[nbp++] = (caddr_t)rdr1(); 2255 } 2256 if (bp & 0x04) { 2257 addr[nbp++] = (caddr_t)rdr2(); 2258 } 2259 if (bp & 0x08) { 2260 addr[nbp++] = (caddr_t)rdr3(); 2261 } 2262 2263 for (i=0; i<nbp; i++) { 2264 if (addr[i] < 2265 (caddr_t)VM_MAXUSER_ADDRESS) { 2266 /* 2267 * addr[i] is in user space 2268 */ 2269 return nbp; 2270 } 2271 } 2272 2273 /* 2274 * None of the breakpoints are in user space. 2275 */ 2276 return 0; 2277} 2278 2279 2280#ifndef DDB 2281void 2282Debugger(const char *msg) 2283{ 2284 printf("Debugger(\"%s\") called.\n", msg); 2285} 2286#endif /* no DDB */ 2287 2288#include <sys/disklabel.h> 2289 2290/* 2291 * Determine the size of the transfer, and make sure it is 2292 * within the boundaries of the partition. Adjust transfer 2293 * if needed, and signal errors or early completion. 2294 */ 2295int 2296bounds_check_with_label(struct bio *bp, struct disklabel *lp, int wlabel) 2297{ 2298 struct partition *p = lp->d_partitions + dkpart(bp->bio_dev); 2299 int labelsect = lp->d_partitions[0].p_offset; 2300 int maxsz = p->p_size, 2301 sz = (bp->bio_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT; 2302 2303 /* overwriting disk label ? */ 2304 /* XXX should also protect bootstrap in first 8K */ 2305 if (bp->bio_blkno + p->p_offset <= LABELSECTOR + labelsect && 2306#if LABELSECTOR != 0 2307 bp->bio_blkno + p->p_offset + sz > LABELSECTOR + labelsect && 2308#endif 2309 (bp->bio_cmd == BIO_WRITE) && wlabel == 0) { 2310 bp->bio_error = EROFS; 2311 goto bad; 2312 } 2313 2314#if defined(DOSBBSECTOR) && defined(notyet) 2315 /* overwriting master boot record? */ 2316 if (bp->bio_blkno + p->p_offset <= DOSBBSECTOR && 2317 (bp->bio_cmd == BIO_WRITE) && wlabel == 0) { 2318 bp->bio_error = EROFS; 2319 goto bad; 2320 } 2321#endif 2322 2323 /* beyond partition? */ 2324 if (bp->bio_blkno < 0 || bp->bio_blkno + sz > maxsz) { 2325 /* if exactly at end of disk, return an EOF */ 2326 if (bp->bio_blkno == maxsz) { 2327 bp->bio_resid = bp->bio_bcount; 2328 return(0); 2329 } 2330 /* or truncate if part of it fits */ 2331 sz = maxsz - bp->bio_blkno; 2332 if (sz <= 0) { 2333 bp->bio_error = EINVAL; 2334 goto bad; 2335 } 2336 bp->bio_bcount = sz << DEV_BSHIFT; 2337 } 2338 2339 bp->bio_pblkno = bp->bio_blkno + p->p_offset; 2340 return(1); 2341 2342bad: 2343 bp->bio_flags |= BIO_ERROR; 2344 return(-1); 2345} 2346 2347#ifdef DDB 2348 2349/* 2350 * Provide inb() and outb() as functions. They are normally only 2351 * available as macros calling inlined functions, thus cannot be 2352 * called inside DDB. 2353 * 2354 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined. 2355 */ 2356 2357#undef inb 2358#undef outb 2359 2360/* silence compiler warnings */ 2361u_char inb(u_int); 2362void outb(u_int, u_char); 2363 2364u_char 2365inb(u_int port) 2366{ 2367 u_char data; 2368 /* 2369 * We use %%dx and not %1 here because i/o is done at %dx and not at 2370 * %edx, while gcc generates inferior code (movw instead of movl) 2371 * if we tell it to load (u_short) port. 2372 */ 2373 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 2374 return (data); 2375} 2376 2377void 2378outb(u_int port, u_char data) 2379{ 2380 u_char al; 2381 /* 2382 * Use an unnecessary assignment to help gcc's register allocator. 2383 * This make a large difference for gcc-1.40 and a tiny difference 2384 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for 2385 * best results. gcc-2.6.0 can't handle this. 2386 */ 2387 al = data; 2388 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 2389} 2390 2391#endif /* DDB */ 2392