machdep.c revision 91315
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 91315 2002-02-26 17:06:21Z dillon $ 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/ucontext.h> 76#include <sys/vmmeter.h> 77#include <sys/bus.h> 78#include <sys/eventhandler.h> 79 80#include <vm/vm.h> 81#include <vm/vm_param.h> 82#include <sys/lock.h> 83#include <vm/vm_kern.h> 84#include <vm/vm_object.h> 85#include <vm/vm_page.h> 86#include <vm/vm_map.h> 87#include <vm/vm_pager.h> 88#include <vm/vm_extern.h> 89 90#include <sys/user.h> 91#include <sys/exec.h> 92#include <sys/cons.h> 93 94#include <ddb/ddb.h> 95 96#include <net/netisr.h> 97 98#include <machine/cpu.h> 99#include <machine/cputypes.h> 100#include <machine/reg.h> 101#include <machine/clock.h> 102#include <machine/specialreg.h> 103#include <machine/bootinfo.h> 104#include <machine/md_var.h> 105#include <machine/pc/bios.h> 106#include <machine/pcb_ext.h> /* pcb.h included via sys/user.h */ 107#include <machine/proc.h> 108#ifdef PERFMON 109#include <machine/perfmon.h> 110#endif 111#ifdef SMP 112#include <machine/privatespace.h> 113#endif 114 115#include <i386/isa/icu.h> 116#include <i386/isa/intr_machdep.h> 117#include <isa/rtc.h> 118#include <machine/vm86.h> 119#include <sys/ptrace.h> 120#include <machine/sigframe.h> 121 122extern void init386 __P((int first)); 123extern void dblfault_handler __P((void)); 124 125extern void printcpuinfo(void); /* XXX header file */ 126extern void earlysetcpuclass(void); /* same header file */ 127extern void finishidentcpu(void); 128extern void panicifcpuunsupported(void); 129extern void initializecpu(void); 130 131#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 132#define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 133 134static void cpu_startup __P((void *)); 135#ifdef CPU_ENABLE_SSE 136static void set_fpregs_xmm __P((struct save87 *, struct savexmm *)); 137static void fill_fpregs_xmm __P((struct savexmm *, struct save87 *)); 138#endif /* CPU_ENABLE_SSE */ 139SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL) 140 141void unpend(void); /* note: not static */ 142 143int _udatasel, _ucodesel; 144u_int atdevbase; 145 146#if defined(SWTCH_OPTIM_STATS) 147extern int swtch_optim_stats; 148SYSCTL_INT(_debug, OID_AUTO, swtch_optim_stats, 149 CTLFLAG_RD, &swtch_optim_stats, 0, ""); 150SYSCTL_INT(_debug, OID_AUTO, tlb_flush_count, 151 CTLFLAG_RD, &tlb_flush_count, 0, ""); 152#endif 153int critical_mode = 1; 154SYSCTL_INT(_debug, OID_AUTO, critical_mode, 155 CTLFLAG_RW, &critical_mode, 0, ""); 156 157#ifdef PC98 158static int ispc98 = 1; 159#else 160static int ispc98 = 0; 161#endif 162SYSCTL_INT(_machdep, OID_AUTO, ispc98, CTLFLAG_RD, &ispc98, 0, ""); 163 164int physmem = 0; 165int cold = 1; 166 167#ifdef COMPAT_43 168static void osendsig __P((sig_t catcher, int sig, sigset_t *mask, u_long code)); 169#endif 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, "IU", ""); 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, "IU", ""); 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 203int Maxmem = 0; 204long dumplo; 205 206vm_offset_t phys_avail[10]; 207 208/* must be 2 less so 0 0 can signal end of chunks */ 209#define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(vm_offset_t)) - 2) 210 211struct kva_md_info kmi; 212 213static struct trapframe proc0_tf; 214#ifndef SMP 215static struct pcpu __pcpu; 216#endif 217 218struct mtx sched_lock; 219struct mtx Giant; 220struct mtx icu_lock; 221 222static void 223cpu_startup(dummy) 224 void *dummy; 225{ 226 /* 227 * Good {morning,afternoon,evening,night}. 228 */ 229 earlysetcpuclass(); 230 startrtclock(); 231 printcpuinfo(); 232 panicifcpuunsupported(); 233#ifdef PERFMON 234 perfmon_init(); 235#endif 236 printf("real memory = %u (%uK bytes)\n", ptoa(Maxmem), 237 ptoa(Maxmem) / 1024); 238 /* 239 * Display any holes after the first chunk of extended memory. 240 */ 241 if (bootverbose) { 242 int indx; 243 244 printf("Physical memory chunk(s):\n"); 245 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) { 246 unsigned int size1; 247 248 size1 = phys_avail[indx + 1] - phys_avail[indx]; 249 printf("0x%08x - 0x%08x, %u bytes (%u pages)\n", 250 phys_avail[indx], phys_avail[indx + 1] - 1, size1, 251 size1 / PAGE_SIZE); 252 } 253 } 254 255 vm_ksubmap_init(&kmi); 256 257#if defined(USERCONFIG) 258 userconfig(); 259 cninit(); /* the preferred console may have changed */ 260#endif 261 262 printf("avail memory = %u (%uK bytes)\n", ptoa(cnt.v_free_count), 263 ptoa(cnt.v_free_count) / 1024); 264 265 /* 266 * Set up buffers, so they can be used to read disk labels. 267 */ 268 bufinit(); 269 vm_pager_bufferinit(); 270 271#ifndef SMP 272 /* For SMP, we delay the cpu_setregs() until after SMP startup. */ 273 cpu_setregs(); 274#endif 275} 276 277/* 278 * Critical section handling. 279 * 280 * Note that our interrupt code handles any interrupt race that occurs 281 * after we decrement td_critnest. 282 */ 283void 284critical_enter(void) 285{ 286 struct thread *td = curthread; 287 288 if (critical_mode == 0) { 289 if (td->td_critnest == 0) 290 td->td_savecrit = cpu_critical_enter(); 291 td->td_critnest++; 292 } else { 293 ++td->td_critnest; 294 } 295} 296 297void 298critical_exit(void) 299{ 300 struct thread *td = curthread; 301 KASSERT(td->td_critnest > 0, ("bad td_critnest value!")); 302 if (--td->td_critnest == 0) { 303 if (td->td_savecrit != (critical_t)-1) { 304 cpu_critical_exit(td->td_savecrit); 305 td->td_savecrit = (critical_t)-1; 306 } else { 307 /* 308 * We may have to schedule pending interrupts. Create 309 * conditions similar to an interrupt context and call 310 * unpend(). 311 */ 312 if (PCPU_GET(int_pending) && td->td_intr_nesting_level == 0) { 313 critical_t eflags; 314 315 eflags = cpu_critical_enter(); 316 if (PCPU_GET(int_pending)) { 317 ++td->td_intr_nesting_level; 318 unpend(); 319 --td->td_intr_nesting_level; 320 } 321 cpu_critical_exit(eflags); 322 } 323 } 324 } 325} 326 327/* 328 * Called from critical_exit() or called from the assembly vector code 329 * to process any interrupts which may have occured while we were in 330 * a critical section. 331 * 332 * - interrupts must be disabled 333 * - td_intr_nesting_level may not be 0 334 * - td_critnest must be 0 335 */ 336void 337unpend(void) 338{ 339 curthread->td_critnest = 1; 340 for (;;) { 341 u_int32_t mask; 342 343 /* 344 * Fast interrupts have priority 345 */ 346 if ((mask = PCPU_GET(fpending)) != 0) { 347 int irq = bsfl(mask); 348 PCPU_SET(fpending, mask & ~(1 << irq)); 349 call_fast_unpend(irq); 350 continue; 351 } 352 353 /* 354 * Threaded interrupts come next 355 */ 356 if ((mask = PCPU_GET(ipending)) != 0) { 357 int irq = bsfl(mask); 358 PCPU_SET(ipending, mask & ~(1 << irq)); 359 sched_ithd((void *)irq); 360 continue; 361 } 362 363 /* 364 * Software interrupts and delayed IPIs are last 365 * 366 * XXX give the bits #defined names. see also 367 * isa/xxx_vector.s 368 */ 369 if ((mask = PCPU_GET(spending)) != 0) { 370 int irq = bsfl(mask); 371 PCPU_SET(spending, mask & ~(1 << irq)); 372 switch(irq) { 373 case 0: /* bit 0 - hardclock */ 374 mtx_lock_spin(&sched_lock); 375 hardclock_process(curthread, 0); 376 mtx_unlock_spin(&sched_lock); 377 break; 378 case 1: /* bit 1 - statclock */ 379 mtx_lock_spin(&sched_lock); 380 statclock_process(curthread->td_kse, (register_t)unpend, 0); 381 mtx_unlock_spin(&sched_lock); 382 break; 383 } 384 continue; 385 } 386 break; 387 } 388 PCPU_SET(int_pending, 0); 389 curthread->td_critnest = 0; 390} 391 392/* 393 * Send an interrupt to process. 394 * 395 * Stack is set up to allow sigcode stored 396 * at top to call routine, followed by kcall 397 * to sigreturn routine below. After sigreturn 398 * resets the signal mask, the stack, and the 399 * frame pointer, it returns to the user 400 * specified pc, psl. 401 */ 402#ifdef COMPAT_43 403static void 404osendsig(catcher, sig, mask, code) 405 sig_t catcher; 406 int sig; 407 sigset_t *mask; 408 u_long code; 409{ 410 struct osigframe sf; 411 struct osigframe *fp; 412 struct proc *p; 413 struct thread *td; 414 struct sigacts *psp; 415 struct trapframe *regs; 416 int oonstack; 417 418 td = curthread; 419 p = td->td_proc; 420 PROC_LOCK_ASSERT(p, MA_OWNED); 421 psp = p->p_sigacts; 422 regs = td->td_frame; 423 oonstack = sigonstack(regs->tf_esp); 424 425 /* Allocate and validate space for the signal handler context. */ 426 if ((p->p_flag & P_ALTSTACK) && !oonstack && 427 SIGISMEMBER(psp->ps_sigonstack, sig)) { 428 fp = (struct osigframe *)(p->p_sigstk.ss_sp + 429 p->p_sigstk.ss_size - sizeof(struct osigframe)); 430#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 431 p->p_sigstk.ss_flags |= SS_ONSTACK; 432#endif 433 } else 434 fp = (struct osigframe *)regs->tf_esp - 1; 435 PROC_UNLOCK(p); 436 437 /* 438 * grow_stack() will return 0 if *fp does not fit inside the stack 439 * and the stack can not be grown. 440 * useracc() will return FALSE if access is denied. 441 */ 442 if (grow_stack(p, (int)fp) == 0 || 443 !useracc((caddr_t)fp, sizeof(*fp), VM_PROT_WRITE)) { 444 /* 445 * Process has trashed its stack; give it an illegal 446 * instruction to halt it in its tracks. 447 */ 448 PROC_LOCK(p); 449 SIGACTION(p, SIGILL) = SIG_DFL; 450 SIGDELSET(p->p_sigignore, SIGILL); 451 SIGDELSET(p->p_sigcatch, SIGILL); 452 SIGDELSET(p->p_sigmask, SIGILL); 453 psignal(p, SIGILL); 454 return; 455 } 456 457 /* Translate the signal if appropriate. */ 458 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize) 459 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 460 461 /* Build the argument list for the signal handler. */ 462 sf.sf_signum = sig; 463 sf.sf_scp = (register_t)&fp->sf_siginfo.si_sc; 464 PROC_LOCK(p); 465 if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) { 466 /* Signal handler installed with SA_SIGINFO. */ 467 sf.sf_arg2 = (register_t)&fp->sf_siginfo; 468 sf.sf_siginfo.si_signo = sig; 469 sf.sf_siginfo.si_code = code; 470 sf.sf_ahu.sf_action = (__osiginfohandler_t *)catcher; 471 } else { 472 /* Old FreeBSD-style arguments. */ 473 sf.sf_arg2 = code; 474 sf.sf_addr = regs->tf_err; 475 sf.sf_ahu.sf_handler = catcher; 476 } 477 PROC_UNLOCK(p); 478 479 /* Save most if not all of trap frame. */ 480 sf.sf_siginfo.si_sc.sc_eax = regs->tf_eax; 481 sf.sf_siginfo.si_sc.sc_ebx = regs->tf_ebx; 482 sf.sf_siginfo.si_sc.sc_ecx = regs->tf_ecx; 483 sf.sf_siginfo.si_sc.sc_edx = regs->tf_edx; 484 sf.sf_siginfo.si_sc.sc_esi = regs->tf_esi; 485 sf.sf_siginfo.si_sc.sc_edi = regs->tf_edi; 486 sf.sf_siginfo.si_sc.sc_cs = regs->tf_cs; 487 sf.sf_siginfo.si_sc.sc_ds = regs->tf_ds; 488 sf.sf_siginfo.si_sc.sc_ss = regs->tf_ss; 489 sf.sf_siginfo.si_sc.sc_es = regs->tf_es; 490 sf.sf_siginfo.si_sc.sc_fs = regs->tf_fs; 491 sf.sf_siginfo.si_sc.sc_gs = rgs(); 492 sf.sf_siginfo.si_sc.sc_isp = regs->tf_isp; 493 494 /* Build the signal context to be used by osigreturn(). */ 495 sf.sf_siginfo.si_sc.sc_onstack = (oonstack) ? 1 : 0; 496 SIG2OSIG(*mask, sf.sf_siginfo.si_sc.sc_mask); 497 sf.sf_siginfo.si_sc.sc_sp = regs->tf_esp; 498 sf.sf_siginfo.si_sc.sc_fp = regs->tf_ebp; 499 sf.sf_siginfo.si_sc.sc_pc = regs->tf_eip; 500 sf.sf_siginfo.si_sc.sc_ps = regs->tf_eflags; 501 sf.sf_siginfo.si_sc.sc_trapno = regs->tf_trapno; 502 sf.sf_siginfo.si_sc.sc_err = regs->tf_err; 503 504 /* 505 * If we're a vm86 process, we want to save the segment registers. 506 * We also change eflags to be our emulated eflags, not the actual 507 * eflags. 508 */ 509 if (regs->tf_eflags & PSL_VM) { 510 /* XXX confusing names: `tf' isn't a trapframe; `regs' is. */ 511 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 512 struct vm86_kernel *vm86 = &td->td_pcb->pcb_ext->ext_vm86; 513 514 sf.sf_siginfo.si_sc.sc_gs = tf->tf_vm86_gs; 515 sf.sf_siginfo.si_sc.sc_fs = tf->tf_vm86_fs; 516 sf.sf_siginfo.si_sc.sc_es = tf->tf_vm86_es; 517 sf.sf_siginfo.si_sc.sc_ds = tf->tf_vm86_ds; 518 519 if (vm86->vm86_has_vme == 0) 520 sf.sf_siginfo.si_sc.sc_ps = 521 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) | 522 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 523 524 /* See sendsig() for comments. */ 525 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP); 526 } 527 528 /* Copy the sigframe out to the user's stack. */ 529 if (copyout(&sf, fp, sizeof(*fp)) != 0) { 530 /* 531 * Something is wrong with the stack pointer. 532 * ...Kill the process. 533 */ 534 PROC_LOCK(p); 535 sigexit(td, SIGILL); 536 /* NOTREACHED */ 537 } 538 539 regs->tf_esp = (int)fp; 540 regs->tf_eip = PS_STRINGS - szosigcode; 541 regs->tf_eflags &= ~PSL_T; 542 regs->tf_cs = _ucodesel; 543 regs->tf_ds = _udatasel; 544 regs->tf_es = _udatasel; 545 regs->tf_fs = _udatasel; 546 load_gs(_udatasel); 547 regs->tf_ss = _udatasel; 548 PROC_LOCK(p); 549} 550#endif 551 552void 553sendsig(catcher, sig, mask, code) 554 sig_t catcher; 555 int sig; 556 sigset_t *mask; 557 u_long code; 558{ 559 struct sigframe sf; 560 struct proc *p; 561 struct thread *td; 562 struct sigacts *psp; 563 struct trapframe *regs; 564 struct sigframe *sfp; 565 int oonstack; 566 567 td = curthread; 568 p = td->td_proc; 569 PROC_LOCK_ASSERT(p, MA_OWNED); 570 psp = p->p_sigacts; 571#ifdef COMPAT_43 572 if (SIGISMEMBER(psp->ps_osigset, sig)) { 573 osendsig(catcher, sig, mask, code); 574 return; 575 } 576#endif 577 regs = td->td_frame; 578 oonstack = sigonstack(regs->tf_esp); 579 580 /* Save user context. */ 581 bzero(&sf, sizeof(sf)); 582 sf.sf_uc.uc_sigmask = *mask; 583 sf.sf_uc.uc_stack = p->p_sigstk; 584 sf.sf_uc.uc_stack.ss_flags = (p->p_flag & P_ALTSTACK) 585 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE; 586 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0; 587 sf.sf_uc.uc_mcontext.mc_gs = rgs(); 588 sf.sf_uc.uc_mcontext.mc_flags = __UC_MC_VALID; /* no FP regs */ 589 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(*regs)); 590 591 /* Allocate and validate space for the signal handler context. */ 592 if ((p->p_flag & P_ALTSTACK) != 0 && !oonstack && 593 SIGISMEMBER(psp->ps_sigonstack, sig)) { 594 sfp = (struct sigframe *)(p->p_sigstk.ss_sp + 595 p->p_sigstk.ss_size - sizeof(struct sigframe)); 596#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 597 p->p_sigstk.ss_flags |= SS_ONSTACK; 598#endif 599 } else 600 sfp = (struct sigframe *)regs->tf_esp - 1; 601 PROC_UNLOCK(p); 602 603 /* 604 * grow_stack() will return 0 if *sfp does not fit inside the stack 605 * and the stack can not be grown. 606 * useracc() will return FALSE if access is denied. 607 */ 608 if (grow_stack(p, (int)sfp) == 0 || 609 !useracc((caddr_t)sfp, sizeof(*sfp), VM_PROT_WRITE)) { 610 /* 611 * Process has trashed its stack; give it an illegal 612 * instruction to halt it in its tracks. 613 */ 614#ifdef DEBUG 615 printf("process %d has trashed its stack\n", p->p_pid); 616#endif 617 PROC_LOCK(p); 618 SIGACTION(p, SIGILL) = SIG_DFL; 619 SIGDELSET(p->p_sigignore, SIGILL); 620 SIGDELSET(p->p_sigcatch, SIGILL); 621 SIGDELSET(p->p_sigmask, SIGILL); 622 psignal(p, SIGILL); 623 return; 624 } 625 626 /* Translate the signal if appropriate. */ 627 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize) 628 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 629 630 /* Build the argument list for the signal handler. */ 631 sf.sf_signum = sig; 632 sf.sf_ucontext = (register_t)&sfp->sf_uc; 633 PROC_LOCK(p); 634 if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) { 635 /* Signal handler installed with SA_SIGINFO. */ 636 sf.sf_siginfo = (register_t)&sfp->sf_si; 637 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher; 638 639 /* Fill siginfo structure. */ 640 sf.sf_si.si_signo = sig; 641 sf.sf_si.si_code = code; 642 sf.sf_si.si_addr = (void *)regs->tf_err; 643 } else { 644 /* Old FreeBSD-style arguments. */ 645 sf.sf_siginfo = code; 646 sf.sf_addr = regs->tf_err; 647 sf.sf_ahu.sf_handler = catcher; 648 } 649 PROC_UNLOCK(p); 650 651 /* 652 * If we're a vm86 process, we want to save the segment registers. 653 * We also change eflags to be our emulated eflags, not the actual 654 * eflags. 655 */ 656 if (regs->tf_eflags & PSL_VM) { 657 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 658 struct vm86_kernel *vm86 = &td->td_pcb->pcb_ext->ext_vm86; 659 660 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs; 661 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs; 662 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es; 663 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds; 664 665 if (vm86->vm86_has_vme == 0) 666 sf.sf_uc.uc_mcontext.mc_eflags = 667 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) | 668 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 669 670 /* 671 * Clear PSL_NT to inhibit T_TSSFLT faults on return from 672 * syscalls made by the signal handler. This just avoids 673 * wasting time for our lazy fixup of such faults. PSL_NT 674 * does nothing in vm86 mode, but vm86 programs can set it 675 * almost legitimately in probes for old cpu types. 676 */ 677 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP); 678 } 679 680 /* Copy the sigframe out to the user's stack. */ 681 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) { 682 /* 683 * Something is wrong with the stack pointer. 684 * ...Kill the process. 685 */ 686 PROC_LOCK(p); 687 sigexit(td, SIGILL); 688 /* NOTREACHED */ 689 } 690 691 regs->tf_esp = (int)sfp; 692 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode); 693 regs->tf_eflags &= ~PSL_T; 694 regs->tf_cs = _ucodesel; 695 regs->tf_ds = _udatasel; 696 regs->tf_es = _udatasel; 697 regs->tf_fs = _udatasel; 698 regs->tf_ss = _udatasel; 699 PROC_LOCK(p); 700} 701 702/* 703 * System call to cleanup state after a signal 704 * has been taken. Reset signal mask and 705 * stack state from context left by sendsig (above). 706 * Return to previous pc and psl as specified by 707 * context left by sendsig. Check carefully to 708 * make sure that the user has not modified the 709 * state to gain improper privileges. 710 */ 711int 712osigreturn(td, uap) 713 struct thread *td; 714 struct osigreturn_args /* { 715 struct osigcontext *sigcntxp; 716 } */ *uap; 717{ 718#ifdef COMPAT_43 719 struct trapframe *regs; 720 struct osigcontext *scp; 721 struct proc *p = td->td_proc; 722 int eflags; 723 724 regs = td->td_frame; 725 scp = uap->sigcntxp; 726 if (!useracc((caddr_t)scp, sizeof(*scp), VM_PROT_READ)) 727 return (EFAULT); 728 eflags = scp->sc_ps; 729 if (eflags & PSL_VM) { 730 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 731 struct vm86_kernel *vm86; 732 733 /* 734 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 735 * set up the vm86 area, and we can't enter vm86 mode. 736 */ 737 if (td->td_pcb->pcb_ext == 0) 738 return (EINVAL); 739 vm86 = &td->td_pcb->pcb_ext->ext_vm86; 740 if (vm86->vm86_inited == 0) 741 return (EINVAL); 742 743 /* Go back to user mode if both flags are set. */ 744 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 745 trapsignal(p, SIGBUS, 0); 746 747 if (vm86->vm86_has_vme) { 748 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 749 (eflags & VME_USERCHANGE) | PSL_VM; 750 } else { 751 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 752 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | 753 (eflags & VM_USERCHANGE) | PSL_VM; 754 } 755 tf->tf_vm86_ds = scp->sc_ds; 756 tf->tf_vm86_es = scp->sc_es; 757 tf->tf_vm86_fs = scp->sc_fs; 758 tf->tf_vm86_gs = scp->sc_gs; 759 tf->tf_ds = _udatasel; 760 tf->tf_es = _udatasel; 761 tf->tf_fs = _udatasel; 762 } else { 763 /* 764 * Don't allow users to change privileged or reserved flags. 765 */ 766 /* 767 * XXX do allow users to change the privileged flag PSL_RF. 768 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 769 * should sometimes set it there too. tf_eflags is kept in 770 * the signal context during signal handling and there is no 771 * other place to remember it, so the PSL_RF bit may be 772 * corrupted by the signal handler without us knowing. 773 * Corruption of the PSL_RF bit at worst causes one more or 774 * one less debugger trap, so allowing it is fairly harmless. 775 */ 776 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 777 return (EINVAL); 778 } 779 780 /* 781 * Don't allow users to load a valid privileged %cs. Let the 782 * hardware check for invalid selectors, excess privilege in 783 * other selectors, invalid %eip's and invalid %esp's. 784 */ 785 if (!CS_SECURE(scp->sc_cs)) { 786 trapsignal(p, SIGBUS, T_PROTFLT); 787 return (EINVAL); 788 } 789 regs->tf_ds = scp->sc_ds; 790 regs->tf_es = scp->sc_es; 791 regs->tf_fs = scp->sc_fs; 792 } 793 794 /* Restore remaining registers. */ 795 regs->tf_eax = scp->sc_eax; 796 regs->tf_ebx = scp->sc_ebx; 797 regs->tf_ecx = scp->sc_ecx; 798 regs->tf_edx = scp->sc_edx; 799 regs->tf_esi = scp->sc_esi; 800 regs->tf_edi = scp->sc_edi; 801 regs->tf_cs = scp->sc_cs; 802 regs->tf_ss = scp->sc_ss; 803 regs->tf_isp = scp->sc_isp; 804 805 PROC_LOCK(p); 806#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 807 if (scp->sc_onstack & 1) 808 p->p_sigstk.ss_flags |= SS_ONSTACK; 809 else 810 p->p_sigstk.ss_flags &= ~SS_ONSTACK; 811#endif 812 813 SIGSETOLD(p->p_sigmask, scp->sc_mask); 814 SIG_CANTMASK(p->p_sigmask); 815 PROC_UNLOCK(p); 816 regs->tf_ebp = scp->sc_fp; 817 regs->tf_esp = scp->sc_sp; 818 regs->tf_eip = scp->sc_pc; 819 regs->tf_eflags = eflags; 820 return (EJUSTRETURN); 821#else /* !COMPAT_43 */ 822 return (ENOSYS); 823#endif /* COMPAT_43 */ 824} 825 826int 827sigreturn(td, uap) 828 struct thread *td; 829 struct sigreturn_args /* { 830 const __ucontext *sigcntxp; 831 } */ *uap; 832{ 833 struct proc *p = td->td_proc; 834 struct trapframe *regs; 835 const ucontext_t *ucp; 836 int cs, eflags; 837 838 ucp = uap->sigcntxp; 839 if (!useracc((caddr_t)(uintptr_t)ucp, sizeof(*ucp), VM_PROT_READ)) 840 return (EFAULT); 841 regs = td->td_frame; 842 eflags = ucp->uc_mcontext.mc_eflags; 843 if (eflags & PSL_VM) { 844 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 845 struct vm86_kernel *vm86; 846 847 /* 848 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 849 * set up the vm86 area, and we can't enter vm86 mode. 850 */ 851 if (td->td_pcb->pcb_ext == 0) 852 return (EINVAL); 853 vm86 = &td->td_pcb->pcb_ext->ext_vm86; 854 if (vm86->vm86_inited == 0) 855 return (EINVAL); 856 857 /* Go back to user mode if both flags are set. */ 858 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 859 trapsignal(p, SIGBUS, 0); 860 861 if (vm86->vm86_has_vme) { 862 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 863 (eflags & VME_USERCHANGE) | PSL_VM; 864 } else { 865 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 866 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | 867 (eflags & VM_USERCHANGE) | PSL_VM; 868 } 869 bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe)); 870 tf->tf_eflags = eflags; 871 tf->tf_vm86_ds = tf->tf_ds; 872 tf->tf_vm86_es = tf->tf_es; 873 tf->tf_vm86_fs = tf->tf_fs; 874 tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs; 875 tf->tf_ds = _udatasel; 876 tf->tf_es = _udatasel; 877 tf->tf_fs = _udatasel; 878 } else { 879 /* 880 * Don't allow users to change privileged or reserved flags. 881 */ 882 /* 883 * XXX do allow users to change the privileged flag PSL_RF. 884 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 885 * should sometimes set it there too. tf_eflags is kept in 886 * the signal context during signal handling and there is no 887 * other place to remember it, so the PSL_RF bit may be 888 * corrupted by the signal handler without us knowing. 889 * Corruption of the PSL_RF bit at worst causes one more or 890 * one less debugger trap, so allowing it is fairly harmless. 891 */ 892 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 893 printf("sigreturn: eflags = 0x%x\n", eflags); 894 return (EINVAL); 895 } 896 897 /* 898 * Don't allow users to load a valid privileged %cs. Let the 899 * hardware check for invalid selectors, excess privilege in 900 * other selectors, invalid %eip's and invalid %esp's. 901 */ 902 cs = ucp->uc_mcontext.mc_cs; 903 if (!CS_SECURE(cs)) { 904 printf("sigreturn: cs = 0x%x\n", cs); 905 trapsignal(p, SIGBUS, T_PROTFLT); 906 return (EINVAL); 907 } 908 909 bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(*regs)); 910 } 911 912 PROC_LOCK(p); 913#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 914 if (ucp->uc_mcontext.mc_onstack & 1) 915 p->p_sigstk.ss_flags |= SS_ONSTACK; 916 else 917 p->p_sigstk.ss_flags &= ~SS_ONSTACK; 918#endif 919 920 p->p_sigmask = ucp->uc_sigmask; 921 SIG_CANTMASK(p->p_sigmask); 922 PROC_UNLOCK(p); 923 return (EJUSTRETURN); 924} 925 926/* 927 * Machine dependent boot() routine 928 * 929 * I haven't seen anything to put here yet 930 * Possibly some stuff might be grafted back here from boot() 931 */ 932void 933cpu_boot(int howto) 934{ 935} 936 937/* 938 * Shutdown the CPU as much as possible 939 */ 940void 941cpu_halt(void) 942{ 943 for (;;) 944 __asm__ ("hlt"); 945} 946 947/* 948 * Hook to idle the CPU when possible. This currently only works in 949 * the !SMP case, as there is no clean way to ensure that a CPU will be 950 * woken when there is work available for it. 951 */ 952static int cpu_idle_hlt = 1; 953SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW, 954 &cpu_idle_hlt, 0, "Idle loop HLT enable"); 955 956/* 957 * Note that we have to be careful here to avoid a race between checking 958 * procrunnable() and actually halting. If we don't do this, we may waste 959 * the time between calling hlt and the next interrupt even though there 960 * is a runnable process. 961 */ 962void 963cpu_idle(void) 964{ 965#ifndef SMP 966 if (cpu_idle_hlt) { 967 disable_intr(); 968 if (procrunnable()) 969 enable_intr(); 970 else { 971 enable_intr(); 972 __asm __volatile("hlt"); 973 } 974 } 975#endif 976} 977 978/* 979 * Clear registers on exec 980 */ 981void 982setregs(td, entry, stack, ps_strings) 983 struct thread *td; 984 u_long entry; 985 u_long stack; 986 u_long ps_strings; 987{ 988 struct trapframe *regs = td->td_frame; 989 struct pcb *pcb = td->td_pcb; 990 991 if (td->td_proc->p_md.md_ldt) 992 user_ldt_free(td); 993 994 bzero((char *)regs, sizeof(struct trapframe)); 995 regs->tf_eip = entry; 996 regs->tf_esp = stack; 997 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T); 998 regs->tf_ss = _udatasel; 999 regs->tf_ds = _udatasel; 1000 regs->tf_es = _udatasel; 1001 regs->tf_fs = _udatasel; 1002 regs->tf_cs = _ucodesel; 1003 1004 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */ 1005 regs->tf_ebx = ps_strings; 1006 1007 /* reset %gs as well */ 1008 if (pcb == PCPU_GET(curpcb)) 1009 load_gs(_udatasel); 1010 else 1011 pcb->pcb_gs = _udatasel; 1012 1013 /* 1014 * Reset the hardware debug registers if they were in use. 1015 * They won't have any meaning for the newly exec'd process. 1016 */ 1017 if (pcb->pcb_flags & PCB_DBREGS) { 1018 pcb->pcb_dr0 = 0; 1019 pcb->pcb_dr1 = 0; 1020 pcb->pcb_dr2 = 0; 1021 pcb->pcb_dr3 = 0; 1022 pcb->pcb_dr6 = 0; 1023 pcb->pcb_dr7 = 0; 1024 if (pcb == PCPU_GET(curpcb)) { 1025 /* 1026 * Clear the debug registers on the running 1027 * CPU, otherwise they will end up affecting 1028 * the next process we switch to. 1029 */ 1030 reset_dbregs(); 1031 } 1032 pcb->pcb_flags &= ~PCB_DBREGS; 1033 } 1034 1035 /* 1036 * Initialize the math emulator (if any) for the current process. 1037 * Actually, just clear the bit that says that the emulator has 1038 * been initialized. Initialization is delayed until the process 1039 * traps to the emulator (if it is done at all) mainly because 1040 * emulators don't provide an entry point for initialization. 1041 */ 1042 td->td_pcb->pcb_flags &= ~FP_SOFTFP; 1043 1044 /* 1045 * Arrange to trap the next npx or `fwait' instruction (see npx.c 1046 * for why fwait must be trapped at least if there is an npx or an 1047 * emulator). This is mainly to handle the case where npx0 is not 1048 * configured, since the npx routines normally set up the trap 1049 * otherwise. It should be done only at boot time, but doing it 1050 * here allows modifying `npx_exists' for testing the emulator on 1051 * systems with an npx. 1052 */ 1053 load_cr0(rcr0() | CR0_MP | CR0_TS); 1054 1055#ifdef DEV_NPX 1056 /* Initialize the npx (if any) for the current process. */ 1057 npxinit(__INITIAL_NPXCW__); 1058#endif 1059 1060 /* 1061 * XXX - Linux emulator 1062 * Make sure sure edx is 0x0 on entry. Linux binaries depend 1063 * on it. 1064 */ 1065 td->td_retval[1] = 0; 1066} 1067 1068void 1069cpu_setregs(void) 1070{ 1071 unsigned int cr0; 1072 1073 cr0 = rcr0(); 1074#ifdef SMP 1075 cr0 |= CR0_NE; /* Done by npxinit() */ 1076#endif 1077 cr0 |= CR0_MP | CR0_TS; /* Done at every execve() too. */ 1078#ifndef I386_CPU 1079 cr0 |= CR0_WP | CR0_AM; 1080#endif 1081 load_cr0(cr0); 1082 load_gs(_udatasel); 1083} 1084 1085static int 1086sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS) 1087{ 1088 int error; 1089 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 1090 req); 1091 if (!error && req->newptr) 1092 resettodr(); 1093 return (error); 1094} 1095 1096SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 1097 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 1098 1099SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, 1100 CTLFLAG_RW, &disable_rtc_set, 0, ""); 1101 1102SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo, 1103 CTLFLAG_RD, &bootinfo, bootinfo, ""); 1104 1105SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock, 1106 CTLFLAG_RW, &wall_cmos_clock, 0, ""); 1107 1108/* 1109 * Initialize 386 and configure to run kernel 1110 */ 1111 1112/* 1113 * Initialize segments & interrupt table 1114 */ 1115 1116int _default_ldt; 1117union descriptor gdt[NGDT * MAXCPU]; /* global descriptor table */ 1118static struct gate_descriptor idt0[NIDT]; 1119struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */ 1120union descriptor ldt[NLDT]; /* local descriptor table */ 1121#ifdef SMP 1122/* table descriptors - used to load tables by microp */ 1123struct region_descriptor r_gdt, r_idt; 1124#endif 1125 1126int private_tss; /* flag indicating private tss */ 1127 1128#if defined(I586_CPU) && !defined(NO_F00F_HACK) 1129extern int has_f00f_bug; 1130#endif 1131 1132static struct i386tss dblfault_tss; 1133static char dblfault_stack[PAGE_SIZE]; 1134 1135extern struct user *proc0uarea; 1136extern vm_offset_t proc0kstack; 1137 1138 1139/* software prototypes -- in more palatable form */ 1140struct soft_segment_descriptor gdt_segs[] = { 1141/* GNULL_SEL 0 Null Descriptor */ 1142{ 0x0, /* segment base address */ 1143 0x0, /* length */ 1144 0, /* segment type */ 1145 0, /* segment descriptor priority level */ 1146 0, /* segment descriptor present */ 1147 0, 0, 1148 0, /* default 32 vs 16 bit size */ 1149 0 /* limit granularity (byte/page units)*/ }, 1150/* GCODE_SEL 1 Code Descriptor for kernel */ 1151{ 0x0, /* segment base address */ 1152 0xfffff, /* length - all address space */ 1153 SDT_MEMERA, /* segment type */ 1154 0, /* segment descriptor priority level */ 1155 1, /* segment descriptor present */ 1156 0, 0, 1157 1, /* default 32 vs 16 bit size */ 1158 1 /* limit granularity (byte/page units)*/ }, 1159/* GDATA_SEL 2 Data Descriptor for kernel */ 1160{ 0x0, /* segment base address */ 1161 0xfffff, /* length - all address space */ 1162 SDT_MEMRWA, /* segment type */ 1163 0, /* segment descriptor priority level */ 1164 1, /* segment descriptor present */ 1165 0, 0, 1166 1, /* default 32 vs 16 bit size */ 1167 1 /* limit granularity (byte/page units)*/ }, 1168/* GPRIV_SEL 3 SMP Per-Processor Private Data Descriptor */ 1169{ 0x0, /* segment base address */ 1170 0xfffff, /* length - all address space */ 1171 SDT_MEMRWA, /* segment type */ 1172 0, /* segment descriptor priority level */ 1173 1, /* segment descriptor present */ 1174 0, 0, 1175 1, /* default 32 vs 16 bit size */ 1176 1 /* limit granularity (byte/page units)*/ }, 1177/* GPROC0_SEL 4 Proc 0 Tss Descriptor */ 1178{ 1179 0x0, /* segment base address */ 1180 sizeof(struct i386tss)-1,/* length - all address space */ 1181 SDT_SYS386TSS, /* segment type */ 1182 0, /* segment descriptor priority level */ 1183 1, /* segment descriptor present */ 1184 0, 0, 1185 0, /* unused - default 32 vs 16 bit size */ 1186 0 /* limit granularity (byte/page units)*/ }, 1187/* GLDT_SEL 5 LDT Descriptor */ 1188{ (int) ldt, /* segment base address */ 1189 sizeof(ldt)-1, /* length - all address space */ 1190 SDT_SYSLDT, /* segment type */ 1191 SEL_UPL, /* segment descriptor priority level */ 1192 1, /* segment descriptor present */ 1193 0, 0, 1194 0, /* unused - default 32 vs 16 bit size */ 1195 0 /* limit granularity (byte/page units)*/ }, 1196/* GUSERLDT_SEL 6 User LDT Descriptor per process */ 1197{ (int) ldt, /* segment base address */ 1198 (512 * sizeof(union descriptor)-1), /* length */ 1199 SDT_SYSLDT, /* segment type */ 1200 0, /* segment descriptor priority level */ 1201 1, /* segment descriptor present */ 1202 0, 0, 1203 0, /* unused - default 32 vs 16 bit size */ 1204 0 /* limit granularity (byte/page units)*/ }, 1205/* GTGATE_SEL 7 Null Descriptor - Placeholder */ 1206{ 0x0, /* segment base address */ 1207 0x0, /* length - all address space */ 1208 0, /* segment type */ 1209 0, /* segment descriptor priority level */ 1210 0, /* segment descriptor present */ 1211 0, 0, 1212 0, /* default 32 vs 16 bit size */ 1213 0 /* limit granularity (byte/page units)*/ }, 1214/* GBIOSLOWMEM_SEL 8 BIOS access to realmode segment 0x40, must be #8 in GDT */ 1215{ 0x400, /* segment base address */ 1216 0xfffff, /* length */ 1217 SDT_MEMRWA, /* segment type */ 1218 0, /* segment descriptor priority level */ 1219 1, /* segment descriptor present */ 1220 0, 0, 1221 1, /* default 32 vs 16 bit size */ 1222 1 /* limit granularity (byte/page units)*/ }, 1223/* GPANIC_SEL 9 Panic Tss Descriptor */ 1224{ (int) &dblfault_tss, /* segment base address */ 1225 sizeof(struct i386tss)-1,/* length - all address space */ 1226 SDT_SYS386TSS, /* segment type */ 1227 0, /* segment descriptor priority level */ 1228 1, /* segment descriptor present */ 1229 0, 0, 1230 0, /* unused - default 32 vs 16 bit size */ 1231 0 /* limit granularity (byte/page units)*/ }, 1232/* GBIOSCODE32_SEL 10 BIOS 32-bit interface (32bit Code) */ 1233{ 0, /* segment base address (overwritten) */ 1234 0xfffff, /* length */ 1235 SDT_MEMERA, /* segment type */ 1236 0, /* segment descriptor priority level */ 1237 1, /* segment descriptor present */ 1238 0, 0, 1239 0, /* default 32 vs 16 bit size */ 1240 1 /* limit granularity (byte/page units)*/ }, 1241/* GBIOSCODE16_SEL 11 BIOS 32-bit interface (16bit Code) */ 1242{ 0, /* segment base address (overwritten) */ 1243 0xfffff, /* length */ 1244 SDT_MEMERA, /* segment type */ 1245 0, /* segment descriptor priority level */ 1246 1, /* segment descriptor present */ 1247 0, 0, 1248 0, /* default 32 vs 16 bit size */ 1249 1 /* limit granularity (byte/page units)*/ }, 1250/* GBIOSDATA_SEL 12 BIOS 32-bit interface (Data) */ 1251{ 0, /* segment base address (overwritten) */ 1252 0xfffff, /* length */ 1253 SDT_MEMRWA, /* segment type */ 1254 0, /* segment descriptor priority level */ 1255 1, /* segment descriptor present */ 1256 0, 0, 1257 1, /* default 32 vs 16 bit size */ 1258 1 /* limit granularity (byte/page units)*/ }, 1259/* GBIOSUTIL_SEL 13 BIOS 16-bit interface (Utility) */ 1260{ 0, /* segment base address (overwritten) */ 1261 0xfffff, /* length */ 1262 SDT_MEMRWA, /* segment type */ 1263 0, /* segment descriptor priority level */ 1264 1, /* segment descriptor present */ 1265 0, 0, 1266 0, /* default 32 vs 16 bit size */ 1267 1 /* limit granularity (byte/page units)*/ }, 1268/* GBIOSARGS_SEL 14 BIOS 16-bit interface (Arguments) */ 1269{ 0, /* segment base address (overwritten) */ 1270 0xfffff, /* length */ 1271 SDT_MEMRWA, /* segment type */ 1272 0, /* segment descriptor priority level */ 1273 1, /* segment descriptor present */ 1274 0, 0, 1275 0, /* default 32 vs 16 bit size */ 1276 1 /* limit granularity (byte/page units)*/ }, 1277}; 1278 1279static struct soft_segment_descriptor ldt_segs[] = { 1280 /* Null Descriptor - overwritten by call gate */ 1281{ 0x0, /* segment base address */ 1282 0x0, /* length - all address space */ 1283 0, /* segment type */ 1284 0, /* segment descriptor priority level */ 1285 0, /* segment descriptor present */ 1286 0, 0, 1287 0, /* default 32 vs 16 bit size */ 1288 0 /* limit granularity (byte/page units)*/ }, 1289 /* Null Descriptor - overwritten by call gate */ 1290{ 0x0, /* segment base address */ 1291 0x0, /* length - all address space */ 1292 0, /* segment type */ 1293 0, /* segment descriptor priority level */ 1294 0, /* segment descriptor present */ 1295 0, 0, 1296 0, /* default 32 vs 16 bit size */ 1297 0 /* limit granularity (byte/page units)*/ }, 1298 /* Null Descriptor - overwritten by call gate */ 1299{ 0x0, /* segment base address */ 1300 0x0, /* length - all address space */ 1301 0, /* segment type */ 1302 0, /* segment descriptor priority level */ 1303 0, /* segment descriptor present */ 1304 0, 0, 1305 0, /* default 32 vs 16 bit size */ 1306 0 /* limit granularity (byte/page units)*/ }, 1307 /* Code Descriptor for user */ 1308{ 0x0, /* segment base address */ 1309 0xfffff, /* length - all address space */ 1310 SDT_MEMERA, /* segment type */ 1311 SEL_UPL, /* segment descriptor priority level */ 1312 1, /* segment descriptor present */ 1313 0, 0, 1314 1, /* default 32 vs 16 bit size */ 1315 1 /* limit granularity (byte/page units)*/ }, 1316 /* Null Descriptor - overwritten by call gate */ 1317{ 0x0, /* segment base address */ 1318 0x0, /* length - all address space */ 1319 0, /* segment type */ 1320 0, /* segment descriptor priority level */ 1321 0, /* segment descriptor present */ 1322 0, 0, 1323 0, /* default 32 vs 16 bit size */ 1324 0 /* limit granularity (byte/page units)*/ }, 1325 /* Data Descriptor for user */ 1326{ 0x0, /* segment base address */ 1327 0xfffff, /* length - all address space */ 1328 SDT_MEMRWA, /* segment type */ 1329 SEL_UPL, /* segment descriptor priority level */ 1330 1, /* segment descriptor present */ 1331 0, 0, 1332 1, /* default 32 vs 16 bit size */ 1333 1 /* limit granularity (byte/page units)*/ }, 1334}; 1335 1336void 1337setidt(idx, func, typ, dpl, selec) 1338 int idx; 1339 inthand_t *func; 1340 int typ; 1341 int dpl; 1342 int selec; 1343{ 1344 struct gate_descriptor *ip; 1345 1346 ip = idt + idx; 1347 ip->gd_looffset = (int)func; 1348 ip->gd_selector = selec; 1349 ip->gd_stkcpy = 0; 1350 ip->gd_xx = 0; 1351 ip->gd_type = typ; 1352 ip->gd_dpl = dpl; 1353 ip->gd_p = 1; 1354 ip->gd_hioffset = ((int)func)>>16 ; 1355} 1356 1357#define IDTVEC(name) __CONCAT(X,name) 1358 1359extern inthand_t 1360 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 1361 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 1362 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 1363 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 1364 IDTVEC(xmm), IDTVEC(lcall_syscall), IDTVEC(int0x80_syscall); 1365 1366void 1367sdtossd(sd, ssd) 1368 struct segment_descriptor *sd; 1369 struct soft_segment_descriptor *ssd; 1370{ 1371 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 1372 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 1373 ssd->ssd_type = sd->sd_type; 1374 ssd->ssd_dpl = sd->sd_dpl; 1375 ssd->ssd_p = sd->sd_p; 1376 ssd->ssd_def32 = sd->sd_def32; 1377 ssd->ssd_gran = sd->sd_gran; 1378} 1379 1380#define PHYSMAP_SIZE (2 * 8) 1381 1382/* 1383 * Populate the (physmap) array with base/bound pairs describing the 1384 * available physical memory in the system, then test this memory and 1385 * build the phys_avail array describing the actually-available memory. 1386 * 1387 * If we cannot accurately determine the physical memory map, then use 1388 * value from the 0xE801 call, and failing that, the RTC. 1389 * 1390 * Total memory size may be set by the kernel environment variable 1391 * hw.physmem or the compile-time define MAXMEM. 1392 */ 1393static void 1394getmemsize(int first) 1395{ 1396 int i, physmap_idx, pa_indx; 1397 u_int basemem, extmem; 1398 struct vm86frame vmf; 1399 struct vm86context vmc; 1400 vm_offset_t pa, physmap[PHYSMAP_SIZE]; 1401 pt_entry_t *pte; 1402 const char *cp; 1403 struct bios_smap *smap; 1404 1405 bzero(&vmf, sizeof(struct vm86frame)); 1406 bzero(physmap, sizeof(physmap)); 1407 1408 /* 1409 * Perform "base memory" related probes & setup 1410 */ 1411 vm86_intcall(0x12, &vmf); 1412 basemem = vmf.vmf_ax; 1413 if (basemem > 640) { 1414 printf("Preposterous BIOS basemem of %uK, truncating to 640K\n", 1415 basemem); 1416 basemem = 640; 1417 } 1418 1419 /* 1420 * XXX if biosbasemem is now < 640, there is a `hole' 1421 * between the end of base memory and the start of 1422 * ISA memory. The hole may be empty or it may 1423 * contain BIOS code or data. Map it read/write so 1424 * that the BIOS can write to it. (Memory from 0 to 1425 * the physical end of the kernel is mapped read-only 1426 * to begin with and then parts of it are remapped. 1427 * The parts that aren't remapped form holes that 1428 * remain read-only and are unused by the kernel. 1429 * The base memory area is below the physical end of 1430 * the kernel and right now forms a read-only hole. 1431 * The part of it from PAGE_SIZE to 1432 * (trunc_page(biosbasemem * 1024) - 1) will be 1433 * remapped and used by the kernel later.) 1434 * 1435 * This code is similar to the code used in 1436 * pmap_mapdev, but since no memory needs to be 1437 * allocated we simply change the mapping. 1438 */ 1439 for (pa = trunc_page(basemem * 1024); 1440 pa < ISA_HOLE_START; pa += PAGE_SIZE) { 1441 pte = vtopte(pa + KERNBASE); 1442 *pte = pa | PG_RW | PG_V; 1443 } 1444 1445 /* 1446 * if basemem != 640, map pages r/w into vm86 page table so 1447 * that the bios can scribble on it. 1448 */ 1449 pte = (pt_entry_t *)vm86paddr; 1450 for (i = basemem / 4; i < 160; i++) 1451 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U; 1452 1453 /* 1454 * map page 1 R/W into the kernel page table so we can use it 1455 * as a buffer. The kernel will unmap this page later. 1456 */ 1457 pte = vtopte(KERNBASE + (1 << PAGE_SHIFT)); 1458 *pte = (1 << PAGE_SHIFT) | PG_RW | PG_V; 1459 1460 /* 1461 * get memory map with INT 15:E820 1462 */ 1463 vmc.npages = 0; 1464 smap = (void *)vm86_addpage(&vmc, 1, KERNBASE + (1 << PAGE_SHIFT)); 1465 vm86_getptr(&vmc, (vm_offset_t)smap, &vmf.vmf_es, &vmf.vmf_di); 1466 1467 physmap_idx = 0; 1468 vmf.vmf_ebx = 0; 1469 do { 1470 vmf.vmf_eax = 0xE820; 1471 vmf.vmf_edx = SMAP_SIG; 1472 vmf.vmf_ecx = sizeof(struct bios_smap); 1473 i = vm86_datacall(0x15, &vmf, &vmc); 1474 if (i || vmf.vmf_eax != SMAP_SIG) 1475 break; 1476 if (boothowto & RB_VERBOSE) 1477 printf("SMAP type=%02x base=%08x %08x len=%08x %08x\n", 1478 smap->type, 1479 *(u_int32_t *)((char *)&smap->base + 4), 1480 (u_int32_t)smap->base, 1481 *(u_int32_t *)((char *)&smap->length + 4), 1482 (u_int32_t)smap->length); 1483 1484 if (smap->type != 0x01) 1485 goto next_run; 1486 1487 if (smap->length == 0) 1488 goto next_run; 1489 1490 if (smap->base >= 0xffffffff) { 1491 printf("%uK of memory above 4GB ignored\n", 1492 (u_int)(smap->length / 1024)); 1493 goto next_run; 1494 } 1495 1496 for (i = 0; i <= physmap_idx; i += 2) { 1497 if (smap->base < physmap[i + 1]) { 1498 if (boothowto & RB_VERBOSE) 1499 printf( 1500 "Overlapping or non-montonic memory region, ignoring second region\n"); 1501 goto next_run; 1502 } 1503 } 1504 1505 if (smap->base == physmap[physmap_idx + 1]) { 1506 physmap[physmap_idx + 1] += smap->length; 1507 goto next_run; 1508 } 1509 1510 physmap_idx += 2; 1511 if (physmap_idx == PHYSMAP_SIZE) { 1512 printf( 1513 "Too many segments in the physical address map, giving up\n"); 1514 break; 1515 } 1516 physmap[physmap_idx] = smap->base; 1517 physmap[physmap_idx + 1] = smap->base + smap->length; 1518next_run: 1519 } while (vmf.vmf_ebx != 0); 1520 1521 if (physmap[1] != 0) 1522 goto physmap_done; 1523 1524 /* 1525 * If we failed above, try memory map with INT 15:E801 1526 */ 1527 vmf.vmf_ax = 0xE801; 1528 if (vm86_intcall(0x15, &vmf) == 0) { 1529 extmem = vmf.vmf_cx + vmf.vmf_dx * 64; 1530 } else { 1531#if 0 1532 vmf.vmf_ah = 0x88; 1533 vm86_intcall(0x15, &vmf); 1534 extmem = vmf.vmf_ax; 1535#else 1536 /* 1537 * Prefer the RTC value for extended memory. 1538 */ 1539 extmem = rtcin(RTC_EXTLO) + (rtcin(RTC_EXTHI) << 8); 1540#endif 1541 } 1542 1543 /* 1544 * Special hack for chipsets that still remap the 384k hole when 1545 * there's 16MB of memory - this really confuses people that 1546 * are trying to use bus mastering ISA controllers with the 1547 * "16MB limit"; they only have 16MB, but the remapping puts 1548 * them beyond the limit. 1549 * 1550 * If extended memory is between 15-16MB (16-17MB phys address range), 1551 * chop it to 15MB. 1552 */ 1553 if ((extmem > 15 * 1024) && (extmem < 16 * 1024)) 1554 extmem = 15 * 1024; 1555 1556 physmap[0] = 0; 1557 physmap[1] = basemem * 1024; 1558 physmap_idx = 2; 1559 physmap[physmap_idx] = 0x100000; 1560 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024; 1561 1562physmap_done: 1563 /* 1564 * Now, physmap contains a map of physical memory. 1565 */ 1566 1567#ifdef SMP 1568 /* make hole for AP bootstrap code */ 1569 physmap[1] = mp_bootaddress(physmap[1] / 1024); 1570 1571 /* look for the MP hardware - needed for apic addresses */ 1572 i386_mp_probe(); 1573#endif 1574 1575 /* 1576 * Maxmem isn't the "maximum memory", it's one larger than the 1577 * highest page of the physical address space. It should be 1578 * called something like "Maxphyspage". We may adjust this 1579 * based on ``hw.physmem'' and the results of the memory test. 1580 */ 1581 Maxmem = atop(physmap[physmap_idx + 1]); 1582 1583#ifdef MAXMEM 1584 Maxmem = MAXMEM / 4; 1585#endif 1586 1587 /* 1588 * hw.physmem is a size in bytes; we also allow k, m, and g suffixes 1589 * for the appropriate modifiers. This overrides MAXMEM. 1590 */ 1591 if ((cp = getenv("hw.physmem")) != NULL) { 1592 u_int64_t AllowMem, sanity; 1593 char *ep; 1594 1595 sanity = AllowMem = strtouq(cp, &ep, 0); 1596 if ((ep != cp) && (*ep != 0)) { 1597 switch(*ep) { 1598 case 'g': 1599 case 'G': 1600 AllowMem <<= 10; 1601 case 'm': 1602 case 'M': 1603 AllowMem <<= 10; 1604 case 'k': 1605 case 'K': 1606 AllowMem <<= 10; 1607 break; 1608 default: 1609 AllowMem = sanity = 0; 1610 } 1611 if (AllowMem < sanity) 1612 AllowMem = 0; 1613 } 1614 if (AllowMem == 0) 1615 printf("Ignoring invalid memory size of '%s'\n", cp); 1616 else 1617 Maxmem = atop(AllowMem); 1618 } 1619 1620 if (atop(physmap[physmap_idx + 1]) != Maxmem && 1621 (boothowto & RB_VERBOSE)) 1622 printf("Physical memory use set to %uK\n", Maxmem * 4); 1623 1624 /* 1625 * If Maxmem has been increased beyond what the system has detected, 1626 * extend the last memory segment to the new limit. 1627 */ 1628 if (atop(physmap[physmap_idx + 1]) < Maxmem) 1629 physmap[physmap_idx + 1] = ptoa(Maxmem); 1630 1631 /* call pmap initialization to make new kernel address space */ 1632 pmap_bootstrap(first, 0); 1633 1634 /* 1635 * Size up each available chunk of physical memory. 1636 */ 1637 physmap[0] = PAGE_SIZE; /* mask off page 0 */ 1638 pa_indx = 0; 1639 phys_avail[pa_indx++] = physmap[0]; 1640 phys_avail[pa_indx] = physmap[0]; 1641#if 0 1642 pte = vtopte(KERNBASE); 1643#else 1644 pte = CMAP1; 1645#endif 1646 1647 /* 1648 * physmap is in bytes, so when converting to page boundaries, 1649 * round up the start address and round down the end address. 1650 */ 1651 for (i = 0; i <= physmap_idx; i += 2) { 1652 vm_offset_t end; 1653 1654 end = ptoa(Maxmem); 1655 if (physmap[i + 1] < end) 1656 end = trunc_page(physmap[i + 1]); 1657 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) { 1658 int tmp, page_bad; 1659#if 0 1660 int *ptr = 0; 1661#else 1662 int *ptr = (int *)CADDR1; 1663#endif 1664 1665 /* 1666 * block out kernel memory as not available. 1667 */ 1668 if (pa >= 0x100000 && pa < first) 1669 continue; 1670 1671 page_bad = FALSE; 1672 1673 /* 1674 * map page into kernel: valid, read/write,non-cacheable 1675 */ 1676 *pte = pa | PG_V | PG_RW | PG_N; 1677 invltlb(); 1678 1679 tmp = *(int *)ptr; 1680 /* 1681 * Test for alternating 1's and 0's 1682 */ 1683 *(volatile int *)ptr = 0xaaaaaaaa; 1684 if (*(volatile int *)ptr != 0xaaaaaaaa) { 1685 page_bad = TRUE; 1686 } 1687 /* 1688 * Test for alternating 0's and 1's 1689 */ 1690 *(volatile int *)ptr = 0x55555555; 1691 if (*(volatile int *)ptr != 0x55555555) { 1692 page_bad = TRUE; 1693 } 1694 /* 1695 * Test for all 1's 1696 */ 1697 *(volatile int *)ptr = 0xffffffff; 1698 if (*(volatile int *)ptr != 0xffffffff) { 1699 page_bad = TRUE; 1700 } 1701 /* 1702 * Test for all 0's 1703 */ 1704 *(volatile int *)ptr = 0x0; 1705 if (*(volatile int *)ptr != 0x0) { 1706 page_bad = TRUE; 1707 } 1708 /* 1709 * Restore original value. 1710 */ 1711 *(int *)ptr = tmp; 1712 1713 /* 1714 * Adjust array of valid/good pages. 1715 */ 1716 if (page_bad == TRUE) { 1717 continue; 1718 } 1719 /* 1720 * If this good page is a continuation of the 1721 * previous set of good pages, then just increase 1722 * the end pointer. Otherwise start a new chunk. 1723 * Note that "end" points one higher than end, 1724 * making the range >= start and < end. 1725 * If we're also doing a speculative memory 1726 * test and we at or past the end, bump up Maxmem 1727 * so that we keep going. The first bad page 1728 * will terminate the loop. 1729 */ 1730 if (phys_avail[pa_indx] == pa) { 1731 phys_avail[pa_indx] += PAGE_SIZE; 1732 } else { 1733 pa_indx++; 1734 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 1735 printf( 1736 "Too many holes in the physical address space, giving up\n"); 1737 pa_indx--; 1738 break; 1739 } 1740 phys_avail[pa_indx++] = pa; /* start */ 1741 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */ 1742 } 1743 physmem++; 1744 } 1745 } 1746 *pte = 0; 1747 invltlb(); 1748 1749 /* 1750 * XXX 1751 * The last chunk must contain at least one page plus the message 1752 * buffer to avoid complicating other code (message buffer address 1753 * calculation, etc.). 1754 */ 1755 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 1756 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) { 1757 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 1758 phys_avail[pa_indx--] = 0; 1759 phys_avail[pa_indx--] = 0; 1760 } 1761 1762 Maxmem = atop(phys_avail[pa_indx]); 1763 1764 /* Trim off space for the message buffer. */ 1765 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE); 1766 1767 avail_end = phys_avail[pa_indx]; 1768} 1769 1770void 1771init386(first) 1772 int first; 1773{ 1774 struct gate_descriptor *gdp; 1775 int gsel_tss, metadata_missing, off, x; 1776#ifndef SMP 1777 /* table descriptors - used to load tables by microp */ 1778 struct region_descriptor r_gdt, r_idt; 1779#endif 1780 struct pcpu *pc; 1781 1782 proc0.p_uarea = proc0uarea; 1783 thread0.td_kstack = proc0kstack; 1784 thread0.td_pcb = (struct pcb *) 1785 (thread0.td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1; 1786 atdevbase = ISA_HOLE_START + KERNBASE; 1787 1788 /* 1789 * This may be done better later if it gets more high level 1790 * components in it. If so just link td->td_proc here. 1791 */ 1792 proc_linkup(&proc0, &proc0.p_ksegrp, &proc0.p_kse, &thread0); 1793 1794 metadata_missing = 0; 1795 if (bootinfo.bi_modulep) { 1796 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE; 1797 preload_bootstrap_relocate(KERNBASE); 1798 } else { 1799 metadata_missing = 1; 1800 } 1801 if (envmode == 1) 1802 kern_envp = static_env; 1803 else if (bootinfo.bi_envp) 1804 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE; 1805 1806 /* Init basic tunables, hz etc */ 1807 init_param1(); 1808 1809 /* 1810 * make gdt memory segments, the code segment goes up to end of the 1811 * page with etext in it, the data segment goes to the end of 1812 * the address space 1813 */ 1814 /* 1815 * XXX text protection is temporarily (?) disabled. The limit was 1816 * i386_btop(round_page(etext)) - 1. 1817 */ 1818 gdt_segs[GCODE_SEL].ssd_limit = atop(0 - 1); 1819 gdt_segs[GDATA_SEL].ssd_limit = atop(0 - 1); 1820#ifdef SMP 1821 pc = &SMP_prvspace[0].pcpu; 1822 gdt_segs[GPRIV_SEL].ssd_limit = 1823 atop(sizeof(struct privatespace) - 1); 1824#else 1825 pc = &__pcpu; 1826 gdt_segs[GPRIV_SEL].ssd_limit = 1827 atop(sizeof(struct pcpu) - 1); 1828#endif 1829 gdt_segs[GPRIV_SEL].ssd_base = (int) pc; 1830 gdt_segs[GPROC0_SEL].ssd_base = (int) &pc->pc_common_tss; 1831 1832 for (x = 0; x < NGDT; x++) { 1833#ifdef BDE_DEBUGGER 1834 /* avoid overwriting db entries with APM ones */ 1835 if (x >= GAPMCODE32_SEL && x <= GAPMDATA_SEL) 1836 continue; 1837#endif 1838 ssdtosd(&gdt_segs[x], &gdt[x].sd); 1839 } 1840 1841 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1; 1842 r_gdt.rd_base = (int) gdt; 1843 lgdt(&r_gdt); 1844 1845 pcpu_init(pc, 0, sizeof(struct pcpu)); 1846 PCPU_SET(prvspace, pc); 1847 1848 /* setup curproc so that mutexes work */ 1849 PCPU_SET(curthread, &thread0); 1850 1851 LIST_INIT(&thread0.td_contested); 1852 1853 /* 1854 * Initialize mutexes. 1855 * 1856 * icu_lock: in order to allow an interrupt to occur in a critical 1857 * section, to set pcpu->ipending (etc...) properly, we 1858 * must be able to get the icu lock, so it can't be 1859 * under witness. 1860 */ 1861 mtx_init(&Giant, "Giant", MTX_DEF | MTX_RECURSE); 1862 mtx_init(&sched_lock, "sched lock", MTX_SPIN | MTX_RECURSE); 1863 mtx_init(&proc0.p_mtx, "process lock", MTX_DEF); 1864 mtx_init(&clock_lock, "clk", MTX_SPIN | MTX_RECURSE); 1865 mtx_init(&icu_lock, "icu", MTX_SPIN | MTX_NOWITNESS); 1866 mtx_lock(&Giant); 1867 1868 /* make ldt memory segments */ 1869 /* 1870 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it 1871 * should be spelled ...MAX_USER... 1872 */ 1873 ldt_segs[LUCODE_SEL].ssd_limit = atop(VM_MAXUSER_ADDRESS - 1); 1874 ldt_segs[LUDATA_SEL].ssd_limit = atop(VM_MAXUSER_ADDRESS - 1); 1875 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++) 1876 ssdtosd(&ldt_segs[x], &ldt[x].sd); 1877 1878 _default_ldt = GSEL(GLDT_SEL, SEL_KPL); 1879 lldt(_default_ldt); 1880 PCPU_SET(currentldt, _default_ldt); 1881 1882 /* exceptions */ 1883 for (x = 0; x < NIDT; x++) 1884 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, 1885 GSEL(GCODE_SEL, SEL_KPL)); 1886 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, 1887 GSEL(GCODE_SEL, SEL_KPL)); 1888 setidt(1, &IDTVEC(dbg), SDT_SYS386IGT, SEL_KPL, 1889 GSEL(GCODE_SEL, SEL_KPL)); 1890 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, 1891 GSEL(GCODE_SEL, SEL_KPL)); 1892 setidt(3, &IDTVEC(bpt), SDT_SYS386IGT, SEL_UPL, 1893 GSEL(GCODE_SEL, SEL_KPL)); 1894 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, 1895 GSEL(GCODE_SEL, SEL_KPL)); 1896 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, 1897 GSEL(GCODE_SEL, SEL_KPL)); 1898 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, 1899 GSEL(GCODE_SEL, SEL_KPL)); 1900 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL 1901 , GSEL(GCODE_SEL, SEL_KPL)); 1902 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL)); 1903 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, 1904 GSEL(GCODE_SEL, SEL_KPL)); 1905 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, 1906 GSEL(GCODE_SEL, SEL_KPL)); 1907 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, 1908 GSEL(GCODE_SEL, SEL_KPL)); 1909 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, 1910 GSEL(GCODE_SEL, SEL_KPL)); 1911 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, 1912 GSEL(GCODE_SEL, SEL_KPL)); 1913 setidt(14, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL, 1914 GSEL(GCODE_SEL, SEL_KPL)); 1915 setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, 1916 GSEL(GCODE_SEL, SEL_KPL)); 1917 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, 1918 GSEL(GCODE_SEL, SEL_KPL)); 1919 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, 1920 GSEL(GCODE_SEL, SEL_KPL)); 1921 setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, 1922 GSEL(GCODE_SEL, SEL_KPL)); 1923 setidt(19, &IDTVEC(xmm), SDT_SYS386TGT, SEL_KPL, 1924 GSEL(GCODE_SEL, SEL_KPL)); 1925 setidt(0x80, &IDTVEC(int0x80_syscall), SDT_SYS386TGT, SEL_UPL, 1926 GSEL(GCODE_SEL, SEL_KPL)); 1927 1928 r_idt.rd_limit = sizeof(idt0) - 1; 1929 r_idt.rd_base = (int) idt; 1930 lidt(&r_idt); 1931 1932 /* 1933 * Initialize the console before we print anything out. 1934 */ 1935 cninit(); 1936 1937 if (metadata_missing) 1938 printf("WARNING: loader(8) metadata is missing!\n"); 1939 1940#ifdef DEV_ISA 1941 isa_defaultirq(); 1942#endif 1943 1944#ifdef DDB 1945 kdb_init(); 1946 if (boothowto & RB_KDB) 1947 Debugger("Boot flags requested debugger"); 1948#endif 1949 1950 finishidentcpu(); /* Final stage of CPU initialization */ 1951 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, 1952 GSEL(GCODE_SEL, SEL_KPL)); 1953 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, 1954 GSEL(GCODE_SEL, SEL_KPL)); 1955 initializecpu(); /* Initialize CPU registers */ 1956 1957 /* make an initial tss so cpu can get interrupt stack on syscall! */ 1958 /* Note: -16 is so we can grow the trapframe if we came from vm86 */ 1959 PCPU_SET(common_tss.tss_esp0, thread0.td_kstack + 1960 KSTACK_PAGES * PAGE_SIZE - sizeof(struct pcb) - 16); 1961 PCPU_SET(common_tss.tss_ss0, GSEL(GDATA_SEL, SEL_KPL)); 1962 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 1963 private_tss = 0; 1964 PCPU_SET(tss_gdt, &gdt[GPROC0_SEL].sd); 1965 PCPU_SET(common_tssd, *PCPU_GET(tss_gdt)); 1966 PCPU_SET(common_tss.tss_ioopt, (sizeof (struct i386tss)) << 16); 1967 ltr(gsel_tss); 1968 1969 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 = 1970 dblfault_tss.tss_esp2 = (int)&dblfault_stack[sizeof(dblfault_stack)]; 1971 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 = 1972 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL); 1973 dblfault_tss.tss_cr3 = (int)IdlePTD; 1974 dblfault_tss.tss_eip = (int)dblfault_handler; 1975 dblfault_tss.tss_eflags = PSL_KERNEL; 1976 dblfault_tss.tss_ds = dblfault_tss.tss_es = 1977 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL); 1978 dblfault_tss.tss_fs = GSEL(GPRIV_SEL, SEL_KPL); 1979 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL); 1980 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL); 1981 1982 vm86_initialize(); 1983 getmemsize(first); 1984 init_param2(physmem); 1985 1986 /* now running on new page tables, configured,and u/iom is accessible */ 1987 1988 /* Map the message buffer. */ 1989 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE) 1990 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off); 1991 1992 msgbufinit(msgbufp, MSGBUF_SIZE); 1993 1994 /* make a call gate to reenter kernel with */ 1995 gdp = &ldt[LSYS5CALLS_SEL].gd; 1996 1997 x = (int) &IDTVEC(lcall_syscall); 1998 gdp->gd_looffset = x; 1999 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL); 2000 gdp->gd_stkcpy = 1; 2001 gdp->gd_type = SDT_SYS386CGT; 2002 gdp->gd_dpl = SEL_UPL; 2003 gdp->gd_p = 1; 2004 gdp->gd_hioffset = x >> 16; 2005 2006 /* XXX does this work? */ 2007 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL]; 2008 ldt[LSOL26CALLS_SEL] = ldt[LSYS5CALLS_SEL]; 2009 2010 /* transfer to user mode */ 2011 2012 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL); 2013 _udatasel = LSEL(LUDATA_SEL, SEL_UPL); 2014 2015 /* setup proc 0's pcb */ 2016 thread0.td_pcb->pcb_flags = 0; /* XXXKSE */ 2017 thread0.td_pcb->pcb_cr3 = (int)IdlePTD; 2018 thread0.td_pcb->pcb_ext = 0; 2019 thread0.td_frame = &proc0_tf; 2020} 2021 2022void 2023cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size) 2024{ 2025} 2026 2027#if defined(I586_CPU) && !defined(NO_F00F_HACK) 2028static void f00f_hack(void *unused); 2029SYSINIT(f00f_hack, SI_SUB_INTRINSIC, SI_ORDER_FIRST, f00f_hack, NULL); 2030 2031static void 2032f00f_hack(void *unused) { 2033 struct gate_descriptor *new_idt; 2034#ifndef SMP 2035 struct region_descriptor r_idt; 2036#endif 2037 vm_offset_t tmp; 2038 2039 if (!has_f00f_bug) 2040 return; 2041 2042 GIANT_REQUIRED; 2043 2044 printf("Intel Pentium detected, installing workaround for F00F bug\n"); 2045 2046 r_idt.rd_limit = sizeof(idt0) - 1; 2047 2048 tmp = kmem_alloc(kernel_map, PAGE_SIZE * 2); 2049 if (tmp == 0) 2050 panic("kmem_alloc returned 0"); 2051 if (((unsigned int)tmp & (PAGE_SIZE-1)) != 0) 2052 panic("kmem_alloc returned non-page-aligned memory"); 2053 /* Put the first seven entries in the lower page */ 2054 new_idt = (struct gate_descriptor*)(tmp + PAGE_SIZE - (7*8)); 2055 bcopy(idt, new_idt, sizeof(idt0)); 2056 r_idt.rd_base = (int)new_idt; 2057 lidt(&r_idt); 2058 idt = new_idt; 2059 if (vm_map_protect(kernel_map, tmp, tmp + PAGE_SIZE, 2060 VM_PROT_READ, FALSE) != KERN_SUCCESS) 2061 panic("vm_map_protect failed"); 2062 return; 2063} 2064#endif /* defined(I586_CPU) && !NO_F00F_HACK */ 2065 2066int 2067ptrace_set_pc(struct thread *td, unsigned long addr) 2068{ 2069 td->td_frame->tf_eip = addr; 2070 return (0); 2071} 2072 2073int 2074ptrace_single_step(struct thread *td) 2075{ 2076 td->td_frame->tf_eflags |= PSL_T; 2077 return (0); 2078} 2079 2080int 2081fill_regs(struct thread *td, struct reg *regs) 2082{ 2083 struct pcb *pcb; 2084 struct trapframe *tp; 2085 2086 tp = td->td_frame; 2087 regs->r_fs = tp->tf_fs; 2088 regs->r_es = tp->tf_es; 2089 regs->r_ds = tp->tf_ds; 2090 regs->r_edi = tp->tf_edi; 2091 regs->r_esi = tp->tf_esi; 2092 regs->r_ebp = tp->tf_ebp; 2093 regs->r_ebx = tp->tf_ebx; 2094 regs->r_edx = tp->tf_edx; 2095 regs->r_ecx = tp->tf_ecx; 2096 regs->r_eax = tp->tf_eax; 2097 regs->r_eip = tp->tf_eip; 2098 regs->r_cs = tp->tf_cs; 2099 regs->r_eflags = tp->tf_eflags; 2100 regs->r_esp = tp->tf_esp; 2101 regs->r_ss = tp->tf_ss; 2102 pcb = td->td_pcb; 2103 regs->r_gs = pcb->pcb_gs; 2104 return (0); 2105} 2106 2107int 2108set_regs(struct thread *td, struct reg *regs) 2109{ 2110 struct pcb *pcb; 2111 struct trapframe *tp; 2112 2113 tp = td->td_frame; 2114 if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) || 2115 !CS_SECURE(regs->r_cs)) 2116 return (EINVAL); 2117 tp->tf_fs = regs->r_fs; 2118 tp->tf_es = regs->r_es; 2119 tp->tf_ds = regs->r_ds; 2120 tp->tf_edi = regs->r_edi; 2121 tp->tf_esi = regs->r_esi; 2122 tp->tf_ebp = regs->r_ebp; 2123 tp->tf_ebx = regs->r_ebx; 2124 tp->tf_edx = regs->r_edx; 2125 tp->tf_ecx = regs->r_ecx; 2126 tp->tf_eax = regs->r_eax; 2127 tp->tf_eip = regs->r_eip; 2128 tp->tf_cs = regs->r_cs; 2129 tp->tf_eflags = regs->r_eflags; 2130 tp->tf_esp = regs->r_esp; 2131 tp->tf_ss = regs->r_ss; 2132 pcb = td->td_pcb; 2133 pcb->pcb_gs = regs->r_gs; 2134 return (0); 2135} 2136 2137#ifdef CPU_ENABLE_SSE 2138static void 2139fill_fpregs_xmm(sv_xmm, sv_87) 2140 struct savexmm *sv_xmm; 2141 struct save87 *sv_87; 2142{ 2143 register struct env87 *penv_87 = &sv_87->sv_env; 2144 register struct envxmm *penv_xmm = &sv_xmm->sv_env; 2145 int i; 2146 2147 bzero(sv_87, sizeof(*sv_87)); 2148 2149 /* FPU control/status */ 2150 penv_87->en_cw = penv_xmm->en_cw; 2151 penv_87->en_sw = penv_xmm->en_sw; 2152 penv_87->en_tw = penv_xmm->en_tw; 2153 penv_87->en_fip = penv_xmm->en_fip; 2154 penv_87->en_fcs = penv_xmm->en_fcs; 2155 penv_87->en_opcode = penv_xmm->en_opcode; 2156 penv_87->en_foo = penv_xmm->en_foo; 2157 penv_87->en_fos = penv_xmm->en_fos; 2158 2159 /* FPU registers */ 2160 for (i = 0; i < 8; ++i) 2161 sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc; 2162 2163 sv_87->sv_ex_sw = sv_xmm->sv_ex_sw; 2164} 2165 2166static void 2167set_fpregs_xmm(sv_87, sv_xmm) 2168 struct save87 *sv_87; 2169 struct savexmm *sv_xmm; 2170{ 2171 register struct env87 *penv_87 = &sv_87->sv_env; 2172 register struct envxmm *penv_xmm = &sv_xmm->sv_env; 2173 int i; 2174 2175 /* FPU control/status */ 2176 penv_xmm->en_cw = penv_87->en_cw; 2177 penv_xmm->en_sw = penv_87->en_sw; 2178 penv_xmm->en_tw = penv_87->en_tw; 2179 penv_xmm->en_fip = penv_87->en_fip; 2180 penv_xmm->en_fcs = penv_87->en_fcs; 2181 penv_xmm->en_opcode = penv_87->en_opcode; 2182 penv_xmm->en_foo = penv_87->en_foo; 2183 penv_xmm->en_fos = penv_87->en_fos; 2184 2185 /* FPU registers */ 2186 for (i = 0; i < 8; ++i) 2187 sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i]; 2188 2189 sv_xmm->sv_ex_sw = sv_87->sv_ex_sw; 2190} 2191#endif /* CPU_ENABLE_SSE */ 2192 2193int 2194fill_fpregs(struct thread *td, struct fpreg *fpregs) 2195{ 2196#ifdef CPU_ENABLE_SSE 2197 if (cpu_fxsr) { 2198 fill_fpregs_xmm(&td->td_pcb->pcb_save.sv_xmm, 2199 (struct save87 *)fpregs); 2200 return (0); 2201 } 2202#endif /* CPU_ENABLE_SSE */ 2203 bcopy(&td->td_pcb->pcb_save.sv_87, fpregs, sizeof *fpregs); 2204 return (0); 2205} 2206 2207int 2208set_fpregs(struct thread *td, struct fpreg *fpregs) 2209{ 2210#ifdef CPU_ENABLE_SSE 2211 if (cpu_fxsr) { 2212 set_fpregs_xmm((struct save87 *)fpregs, 2213 &td->td_pcb->pcb_save.sv_xmm); 2214 return (0); 2215 } 2216#endif /* CPU_ENABLE_SSE */ 2217 bcopy(fpregs, &td->td_pcb->pcb_save.sv_87, sizeof *fpregs); 2218 return (0); 2219} 2220 2221int 2222fill_dbregs(struct thread *td, struct dbreg *dbregs) 2223{ 2224 struct pcb *pcb; 2225 2226 if (td == NULL) { 2227 dbregs->dr0 = rdr0(); 2228 dbregs->dr1 = rdr1(); 2229 dbregs->dr2 = rdr2(); 2230 dbregs->dr3 = rdr3(); 2231 dbregs->dr4 = rdr4(); 2232 dbregs->dr5 = rdr5(); 2233 dbregs->dr6 = rdr6(); 2234 dbregs->dr7 = rdr7(); 2235 } else { 2236 pcb = td->td_pcb; 2237 dbregs->dr0 = pcb->pcb_dr0; 2238 dbregs->dr1 = pcb->pcb_dr1; 2239 dbregs->dr2 = pcb->pcb_dr2; 2240 dbregs->dr3 = pcb->pcb_dr3; 2241 dbregs->dr4 = 0; 2242 dbregs->dr5 = 0; 2243 dbregs->dr6 = pcb->pcb_dr6; 2244 dbregs->dr7 = pcb->pcb_dr7; 2245 } 2246 return (0); 2247} 2248 2249int 2250set_dbregs(struct thread *td, struct dbreg *dbregs) 2251{ 2252 struct pcb *pcb; 2253 int i; 2254 u_int32_t mask1, mask2; 2255 2256 if (td == NULL) { 2257 load_dr0(dbregs->dr0); 2258 load_dr1(dbregs->dr1); 2259 load_dr2(dbregs->dr2); 2260 load_dr3(dbregs->dr3); 2261 load_dr4(dbregs->dr4); 2262 load_dr5(dbregs->dr5); 2263 load_dr6(dbregs->dr6); 2264 load_dr7(dbregs->dr7); 2265 } else { 2266 /* 2267 * Don't let an illegal value for dr7 get set. Specifically, 2268 * check for undefined settings. Setting these bit patterns 2269 * result in undefined behaviour and can lead to an unexpected 2270 * TRCTRAP. 2271 */ 2272 for (i = 0, mask1 = 0x3<<16, mask2 = 0x2<<16; i < 8; 2273 i++, mask1 <<= 2, mask2 <<= 2) 2274 if ((dbregs->dr7 & mask1) == mask2) 2275 return (EINVAL); 2276 2277 pcb = td->td_pcb; 2278 2279 /* 2280 * Don't let a process set a breakpoint that is not within the 2281 * process's address space. If a process could do this, it 2282 * could halt the system by setting a breakpoint in the kernel 2283 * (if ddb was enabled). Thus, we need to check to make sure 2284 * that no breakpoints are being enabled for addresses outside 2285 * process's address space, unless, perhaps, we were called by 2286 * uid 0. 2287 * 2288 * XXX - what about when the watched area of the user's 2289 * address space is written into from within the kernel 2290 * ... wouldn't that still cause a breakpoint to be generated 2291 * from within kernel mode? 2292 */ 2293 2294 if (suser_td(td) != 0) { 2295 if (dbregs->dr7 & 0x3) { 2296 /* dr0 is enabled */ 2297 if (dbregs->dr0 >= VM_MAXUSER_ADDRESS) 2298 return (EINVAL); 2299 } 2300 2301 if (dbregs->dr7 & (0x3<<2)) { 2302 /* dr1 is enabled */ 2303 if (dbregs->dr1 >= VM_MAXUSER_ADDRESS) 2304 return (EINVAL); 2305 } 2306 2307 if (dbregs->dr7 & (0x3<<4)) { 2308 /* dr2 is enabled */ 2309 if (dbregs->dr2 >= VM_MAXUSER_ADDRESS) 2310 return (EINVAL); 2311 } 2312 2313 if (dbregs->dr7 & (0x3<<6)) { 2314 /* dr3 is enabled */ 2315 if (dbregs->dr3 >= VM_MAXUSER_ADDRESS) 2316 return (EINVAL); 2317 } 2318 } 2319 2320 pcb->pcb_dr0 = dbregs->dr0; 2321 pcb->pcb_dr1 = dbregs->dr1; 2322 pcb->pcb_dr2 = dbregs->dr2; 2323 pcb->pcb_dr3 = dbregs->dr3; 2324 pcb->pcb_dr6 = dbregs->dr6; 2325 pcb->pcb_dr7 = dbregs->dr7; 2326 2327 pcb->pcb_flags |= PCB_DBREGS; 2328 } 2329 2330 return (0); 2331} 2332 2333/* 2334 * Return > 0 if a hardware breakpoint has been hit, and the 2335 * breakpoint was in user space. Return 0, otherwise. 2336 */ 2337int 2338user_dbreg_trap(void) 2339{ 2340 u_int32_t dr7, dr6; /* debug registers dr6 and dr7 */ 2341 u_int32_t bp; /* breakpoint bits extracted from dr6 */ 2342 int nbp; /* number of breakpoints that triggered */ 2343 caddr_t addr[4]; /* breakpoint addresses */ 2344 int i; 2345 2346 dr7 = rdr7(); 2347 if ((dr7 & 0x000000ff) == 0) { 2348 /* 2349 * all GE and LE bits in the dr7 register are zero, 2350 * thus the trap couldn't have been caused by the 2351 * hardware debug registers 2352 */ 2353 return 0; 2354 } 2355 2356 nbp = 0; 2357 dr6 = rdr6(); 2358 bp = dr6 & 0x0000000f; 2359 2360 if (!bp) { 2361 /* 2362 * None of the breakpoint bits are set meaning this 2363 * trap was not caused by any of the debug registers 2364 */ 2365 return 0; 2366 } 2367 2368 /* 2369 * at least one of the breakpoints were hit, check to see 2370 * which ones and if any of them are user space addresses 2371 */ 2372 2373 if (bp & 0x01) { 2374 addr[nbp++] = (caddr_t)rdr0(); 2375 } 2376 if (bp & 0x02) { 2377 addr[nbp++] = (caddr_t)rdr1(); 2378 } 2379 if (bp & 0x04) { 2380 addr[nbp++] = (caddr_t)rdr2(); 2381 } 2382 if (bp & 0x08) { 2383 addr[nbp++] = (caddr_t)rdr3(); 2384 } 2385 2386 for (i=0; i<nbp; i++) { 2387 if (addr[i] < 2388 (caddr_t)VM_MAXUSER_ADDRESS) { 2389 /* 2390 * addr[i] is in user space 2391 */ 2392 return nbp; 2393 } 2394 } 2395 2396 /* 2397 * None of the breakpoints are in user space. 2398 */ 2399 return 0; 2400} 2401 2402 2403#ifndef DDB 2404void 2405Debugger(const char *msg) 2406{ 2407 printf("Debugger(\"%s\") called.\n", msg); 2408} 2409#endif /* no DDB */ 2410 2411#include <sys/disklabel.h> 2412 2413/* 2414 * Determine the size of the transfer, and make sure it is 2415 * within the boundaries of the partition. Adjust transfer 2416 * if needed, and signal errors or early completion. 2417 */ 2418int 2419bounds_check_with_label(struct bio *bp, struct disklabel *lp, int wlabel) 2420{ 2421 struct partition *p = lp->d_partitions + dkpart(bp->bio_dev); 2422 int labelsect = lp->d_partitions[0].p_offset; 2423 int maxsz = p->p_size, 2424 sz = (bp->bio_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT; 2425 2426 /* overwriting disk label ? */ 2427 /* XXX should also protect bootstrap in first 8K */ 2428 if (bp->bio_blkno + p->p_offset <= LABELSECTOR + labelsect && 2429#if LABELSECTOR != 0 2430 bp->bio_blkno + p->p_offset + sz > LABELSECTOR + labelsect && 2431#endif 2432 (bp->bio_cmd == BIO_WRITE) && wlabel == 0) { 2433 bp->bio_error = EROFS; 2434 goto bad; 2435 } 2436 2437#if defined(DOSBBSECTOR) && defined(notyet) 2438 /* overwriting master boot record? */ 2439 if (bp->bio_blkno + p->p_offset <= DOSBBSECTOR && 2440 (bp->bio_cmd == BIO_WRITE) && wlabel == 0) { 2441 bp->bio_error = EROFS; 2442 goto bad; 2443 } 2444#endif 2445 2446 /* beyond partition? */ 2447 if (bp->bio_blkno < 0 || bp->bio_blkno + sz > maxsz) { 2448 /* if exactly at end of disk, return an EOF */ 2449 if (bp->bio_blkno == maxsz) { 2450 bp->bio_resid = bp->bio_bcount; 2451 return(0); 2452 } 2453 /* or truncate if part of it fits */ 2454 sz = maxsz - bp->bio_blkno; 2455 if (sz <= 0) { 2456 bp->bio_error = EINVAL; 2457 goto bad; 2458 } 2459 bp->bio_bcount = sz << DEV_BSHIFT; 2460 } 2461 2462 bp->bio_pblkno = bp->bio_blkno + p->p_offset; 2463 return(1); 2464 2465bad: 2466 bp->bio_flags |= BIO_ERROR; 2467 return(-1); 2468} 2469 2470#ifdef DDB 2471 2472/* 2473 * Provide inb() and outb() as functions. They are normally only 2474 * available as macros calling inlined functions, thus cannot be 2475 * called inside DDB. 2476 * 2477 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined. 2478 */ 2479 2480#undef inb 2481#undef outb 2482 2483/* silence compiler warnings */ 2484u_char inb(u_int); 2485void outb(u_int, u_char); 2486 2487u_char 2488inb(u_int port) 2489{ 2490 u_char data; 2491 /* 2492 * We use %%dx and not %1 here because i/o is done at %dx and not at 2493 * %edx, while gcc generates inferior code (movw instead of movl) 2494 * if we tell it to load (u_short) port. 2495 */ 2496 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 2497 return (data); 2498} 2499 2500void 2501outb(u_int port, u_char data) 2502{ 2503 u_char al; 2504 /* 2505 * Use an unnecessary assignment to help gcc's register allocator. 2506 * This make a large difference for gcc-1.40 and a tiny difference 2507 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for 2508 * best results. gcc-2.6.0 can't handle this. 2509 */ 2510 al = data; 2511 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 2512} 2513 2514#endif /* DDB */ 2515