machdep.c revision 90065
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 90065 2002-02-01 15:44:03Z bde $ 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/proc.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 pcpu __pcpu; 210#endif 211 212struct mtx sched_lock; 213struct mtx Giant; 214struct mtx icu_lock; 215 216static void 217cpu_startup(dummy) 218 void *dummy; 219{ 220 /* 221 * Good {morning,afternoon,evening,night}. 222 */ 223 earlysetcpuclass(); 224 startrtclock(); 225 printcpuinfo(); 226 panicifcpuunsupported(); 227#ifdef PERFMON 228 perfmon_init(); 229#endif 230 printf("real memory = %u (%uK bytes)\n", ptoa(Maxmem), 231 ptoa(Maxmem) / 1024); 232 /* 233 * Display any holes after the first chunk of extended memory. 234 */ 235 if (bootverbose) { 236 int indx; 237 238 printf("Physical memory chunk(s):\n"); 239 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) { 240 unsigned int size1; 241 242 size1 = phys_avail[indx + 1] - phys_avail[indx]; 243 printf("0x%08x - 0x%08x, %u bytes (%u pages)\n", 244 phys_avail[indx], phys_avail[indx + 1] - 1, size1, 245 size1 / PAGE_SIZE); 246 } 247 } 248 249 vm_ksubmap_init(&kmi); 250 251#if defined(USERCONFIG) 252 userconfig(); 253 cninit(); /* the preferred console may have changed */ 254#endif 255 256 printf("avail memory = %u (%uK bytes)\n", ptoa(cnt.v_free_count), 257 ptoa(cnt.v_free_count) / 1024); 258 259 /* 260 * Set up buffers, so they can be used to read disk labels. 261 */ 262 bufinit(); 263 vm_pager_bufferinit(); 264 265#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_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_eflags &= ~PSL_T; 421 regs->tf_cs = _ucodesel; 422 regs->tf_ds = _udatasel; 423 regs->tf_es = _udatasel; 424 regs->tf_fs = _udatasel; 425 load_gs(_udatasel); 426 regs->tf_ss = _udatasel; 427 PROC_LOCK(p); 428} 429#endif 430 431void 432sendsig(catcher, sig, mask, code) 433 sig_t catcher; 434 int sig; 435 sigset_t *mask; 436 u_long code; 437{ 438 struct sigframe sf; 439 struct proc *p; 440 struct thread *td; 441 struct sigacts *psp; 442 struct trapframe *regs; 443 struct sigframe *sfp; 444 int oonstack; 445 446 td = curthread; 447 p = td->td_proc; 448 PROC_LOCK_ASSERT(p, MA_OWNED); 449 psp = p->p_sigacts; 450#ifdef COMPAT_43 451 if (SIGISMEMBER(psp->ps_osigset, sig)) { 452 osendsig(catcher, sig, mask, code); 453 return; 454 } 455#endif 456 regs = td->td_frame; 457 oonstack = sigonstack(regs->tf_esp); 458 459 /* Save user context. */ 460 bzero(&sf, sizeof(sf)); 461 sf.sf_uc.uc_sigmask = *mask; 462 sf.sf_uc.uc_stack = p->p_sigstk; 463 sf.sf_uc.uc_stack.ss_flags = (p->p_flag & P_ALTSTACK) 464 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE; 465 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0; 466 sf.sf_uc.uc_mcontext.mc_gs = rgs(); 467 sf.sf_uc.uc_mcontext.mc_flags = __UC_MC_VALID; /* no FP regs */ 468 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_fs, sizeof(*regs)); 469 470 /* Allocate and validate space for the signal handler context. */ 471 if ((p->p_flag & P_ALTSTACK) != 0 && !oonstack && 472 SIGISMEMBER(psp->ps_sigonstack, sig)) { 473 sfp = (struct sigframe *)(p->p_sigstk.ss_sp + 474 p->p_sigstk.ss_size - sizeof(struct sigframe)); 475#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 476 p->p_sigstk.ss_flags |= SS_ONSTACK; 477#endif 478 } else 479 sfp = (struct sigframe *)regs->tf_esp - 1; 480 PROC_UNLOCK(p); 481 482 /* 483 * grow_stack() will return 0 if *sfp does not fit inside the stack 484 * and the stack can not be grown. 485 * useracc() will return FALSE if access is denied. 486 */ 487 if (grow_stack(p, (int)sfp) == 0 || 488 !useracc((caddr_t)sfp, sizeof(*sfp), VM_PROT_WRITE)) { 489 /* 490 * Process has trashed its stack; give it an illegal 491 * instruction to halt it in its tracks. 492 */ 493#ifdef DEBUG 494 printf("process %d has trashed its stack\n", p->p_pid); 495#endif 496 PROC_LOCK(p); 497 SIGACTION(p, SIGILL) = SIG_DFL; 498 SIGDELSET(p->p_sigignore, SIGILL); 499 SIGDELSET(p->p_sigcatch, SIGILL); 500 SIGDELSET(p->p_sigmask, SIGILL); 501 psignal(p, SIGILL); 502 return; 503 } 504 505 /* Translate the signal if appropriate. */ 506 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize) 507 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 508 509 /* Build the argument list for the signal handler. */ 510 sf.sf_signum = sig; 511 sf.sf_ucontext = (register_t)&sfp->sf_uc; 512 PROC_LOCK(p); 513 if (SIGISMEMBER(p->p_sigacts->ps_siginfo, sig)) { 514 /* Signal handler installed with SA_SIGINFO. */ 515 sf.sf_siginfo = (register_t)&sfp->sf_si; 516 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher; 517 518 /* Fill siginfo structure. */ 519 sf.sf_si.si_signo = sig; 520 sf.sf_si.si_code = code; 521 sf.sf_si.si_addr = (void *)regs->tf_err; 522 } else { 523 /* Old FreeBSD-style arguments. */ 524 sf.sf_siginfo = code; 525 sf.sf_addr = regs->tf_err; 526 sf.sf_ahu.sf_handler = catcher; 527 } 528 PROC_UNLOCK(p); 529 530 /* 531 * If we're a vm86 process, we want to save the segment registers. 532 * We also change eflags to be our emulated eflags, not the actual 533 * eflags. 534 */ 535 if (regs->tf_eflags & PSL_VM) { 536 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 537 struct vm86_kernel *vm86 = &td->td_pcb->pcb_ext->ext_vm86; 538 539 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs; 540 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs; 541 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es; 542 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds; 543 544 if (vm86->vm86_has_vme == 0) 545 sf.sf_uc.uc_mcontext.mc_eflags = 546 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) | 547 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 548 549 /* 550 * Clear PSL_NT to inhibit T_TSSFLT faults on return from 551 * syscalls made by the signal handler. This just avoids 552 * wasting time for our lazy fixup of such faults. PSL_NT 553 * does nothing in vm86 mode, but vm86 programs can set it 554 * almost legitimately in probes for old cpu types. 555 */ 556 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP); 557 } 558 559 /* Copy the sigframe out to the user's stack. */ 560 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) { 561 /* 562 * Something is wrong with the stack pointer. 563 * ...Kill the process. 564 */ 565 PROC_LOCK(p); 566 sigexit(td, SIGILL); 567 /* NOTREACHED */ 568 } 569 570 regs->tf_esp = (int)sfp; 571 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode); 572 regs->tf_eflags &= ~PSL_T; 573 regs->tf_cs = _ucodesel; 574 regs->tf_ds = _udatasel; 575 regs->tf_es = _udatasel; 576 regs->tf_fs = _udatasel; 577 regs->tf_ss = _udatasel; 578 PROC_LOCK(p); 579} 580 581/* 582 * System call to cleanup state after a signal 583 * has been taken. Reset signal mask and 584 * stack state from context left by sendsig (above). 585 * Return to previous pc and psl as specified by 586 * context left by sendsig. Check carefully to 587 * make sure that the user has not modified the 588 * state to gain improper privileges. 589 */ 590int 591osigreturn(td, uap) 592 struct thread *td; 593 struct osigreturn_args /* { 594 struct osigcontext *sigcntxp; 595 } */ *uap; 596{ 597 struct trapframe *regs; 598 struct osigcontext *scp; 599 struct proc *p = td->td_proc; 600 int eflags; 601 602 regs = td->td_frame; 603 scp = uap->sigcntxp; 604 if (!useracc((caddr_t)scp, sizeof(*scp), VM_PROT_READ)) 605 return (EFAULT); 606 eflags = scp->sc_ps; 607 if (eflags & PSL_VM) { 608 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 609 struct vm86_kernel *vm86; 610 611 /* 612 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 613 * set up the vm86 area, and we can't enter vm86 mode. 614 */ 615 if (td->td_pcb->pcb_ext == 0) 616 return (EINVAL); 617 vm86 = &td->td_pcb->pcb_ext->ext_vm86; 618 if (vm86->vm86_inited == 0) 619 return (EINVAL); 620 621 /* Go back to user mode if both flags are set. */ 622 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 623 trapsignal(p, SIGBUS, 0); 624 625 if (vm86->vm86_has_vme) { 626 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 627 (eflags & VME_USERCHANGE) | PSL_VM; 628 } else { 629 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 630 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | 631 (eflags & VM_USERCHANGE) | PSL_VM; 632 } 633 tf->tf_vm86_ds = scp->sc_ds; 634 tf->tf_vm86_es = scp->sc_es; 635 tf->tf_vm86_fs = scp->sc_fs; 636 tf->tf_vm86_gs = scp->sc_gs; 637 tf->tf_ds = _udatasel; 638 tf->tf_es = _udatasel; 639 tf->tf_fs = _udatasel; 640 } else { 641 /* 642 * Don't allow users to change privileged or reserved flags. 643 */ 644 /* 645 * XXX do allow users to change the privileged flag PSL_RF. 646 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 647 * should sometimes set it there too. tf_eflags is kept in 648 * the signal context during signal handling and there is no 649 * other place to remember it, so the PSL_RF bit may be 650 * corrupted by the signal handler without us knowing. 651 * Corruption of the PSL_RF bit at worst causes one more or 652 * one less debugger trap, so allowing it is fairly harmless. 653 */ 654 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 655 return (EINVAL); 656 } 657 658 /* 659 * Don't allow users to load a valid privileged %cs. Let the 660 * hardware check for invalid selectors, excess privilege in 661 * other selectors, invalid %eip's and invalid %esp's. 662 */ 663 if (!CS_SECURE(scp->sc_cs)) { 664 trapsignal(p, SIGBUS, T_PROTFLT); 665 return (EINVAL); 666 } 667 regs->tf_ds = scp->sc_ds; 668 regs->tf_es = scp->sc_es; 669 regs->tf_fs = scp->sc_fs; 670 } 671 672 /* Restore remaining registers. */ 673 regs->tf_eax = scp->sc_eax; 674 regs->tf_ebx = scp->sc_ebx; 675 regs->tf_ecx = scp->sc_ecx; 676 regs->tf_edx = scp->sc_edx; 677 regs->tf_esi = scp->sc_esi; 678 regs->tf_edi = scp->sc_edi; 679 regs->tf_cs = scp->sc_cs; 680 regs->tf_ss = scp->sc_ss; 681 regs->tf_isp = scp->sc_isp; 682 683 PROC_LOCK(p); 684#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 685 if (scp->sc_onstack & 1) 686 p->p_sigstk.ss_flags |= SS_ONSTACK; 687 else 688 p->p_sigstk.ss_flags &= ~SS_ONSTACK; 689#endif 690 691 SIGSETOLD(p->p_sigmask, scp->sc_mask); 692 SIG_CANTMASK(p->p_sigmask); 693 PROC_UNLOCK(p); 694 regs->tf_ebp = scp->sc_fp; 695 regs->tf_esp = scp->sc_sp; 696 regs->tf_eip = scp->sc_pc; 697 regs->tf_eflags = eflags; 698 return (EJUSTRETURN); 699} 700 701int 702sigreturn(td, uap) 703 struct thread *td; 704 struct sigreturn_args /* { 705 ucontext_t *sigcntxp; 706 } */ *uap; 707{ 708 struct proc *p = td->td_proc; 709 struct osigcontext *oscp; 710 struct osigreturn_args *ouap; 711 struct trapframe *regs; 712 ucontext_t *ucp; 713 int cs, eflags; 714 715#ifdef COMPAT_43 716 ouap = (struct osigreturn_args *)uap; 717 oscp = ouap->sigcntxp; 718 if (fuword(&oscp->sc_trapno) == 0x01d516) 719 return (osigreturn(td, ouap)); 720#endif 721 722 ucp = uap->sigcntxp; 723 if (!useracc((caddr_t)ucp, sizeof(*ucp), VM_PROT_READ)) 724 return (EFAULT); 725 regs = td->td_frame; 726 eflags = ucp->uc_mcontext.mc_eflags; 727 if (eflags & PSL_VM) { 728 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 729 struct vm86_kernel *vm86; 730 731 /* 732 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 733 * set up the vm86 area, and we can't enter vm86 mode. 734 */ 735 if (td->td_pcb->pcb_ext == 0) 736 return (EINVAL); 737 vm86 = &td->td_pcb->pcb_ext->ext_vm86; 738 if (vm86->vm86_inited == 0) 739 return (EINVAL); 740 741 /* Go back to user mode if both flags are set. */ 742 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 743 trapsignal(p, SIGBUS, 0); 744 745 if (vm86->vm86_has_vme) { 746 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 747 (eflags & VME_USERCHANGE) | PSL_VM; 748 } else { 749 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 750 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | 751 (eflags & VM_USERCHANGE) | PSL_VM; 752 } 753 bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe)); 754 tf->tf_eflags = eflags; 755 tf->tf_vm86_ds = tf->tf_ds; 756 tf->tf_vm86_es = tf->tf_es; 757 tf->tf_vm86_fs = tf->tf_fs; 758 tf->tf_vm86_gs = ucp->uc_mcontext.mc_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 printf("sigreturn: eflags = 0x%x\n", eflags); 778 return (EINVAL); 779 } 780 781 /* 782 * Don't allow users to load a valid privileged %cs. Let the 783 * hardware check for invalid selectors, excess privilege in 784 * other selectors, invalid %eip's and invalid %esp's. 785 */ 786 cs = ucp->uc_mcontext.mc_cs; 787 if (!CS_SECURE(cs)) { 788 printf("sigreturn: cs = 0x%x\n", cs); 789 trapsignal(p, SIGBUS, T_PROTFLT); 790 return (EINVAL); 791 } 792 793 bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(*regs)); 794 } 795 796 PROC_LOCK(p); 797#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 798 if (ucp->uc_mcontext.mc_onstack & 1) 799 p->p_sigstk.ss_flags |= SS_ONSTACK; 800 else 801 p->p_sigstk.ss_flags &= ~SS_ONSTACK; 802#endif 803 804 p->p_sigmask = ucp->uc_sigmask; 805 SIG_CANTMASK(p->p_sigmask); 806 PROC_UNLOCK(p); 807 return (EJUSTRETURN); 808} 809 810/* 811 * Machine dependent boot() routine 812 * 813 * I haven't seen anything to put here yet 814 * Possibly some stuff might be grafted back here from boot() 815 */ 816void 817cpu_boot(int howto) 818{ 819} 820 821/* 822 * Shutdown the CPU as much as possible 823 */ 824void 825cpu_halt(void) 826{ 827 for (;;) 828 __asm__ ("hlt"); 829} 830 831/* 832 * Hook to idle the CPU when possible. This currently only works in 833 * the !SMP case, as there is no clean way to ensure that a CPU will be 834 * woken when there is work available for it. 835 */ 836static int cpu_idle_hlt = 1; 837SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW, 838 &cpu_idle_hlt, 0, "Idle loop HLT enable"); 839 840/* 841 * Note that we have to be careful here to avoid a race between checking 842 * procrunnable() and actually halting. If we don't do this, we may waste 843 * the time between calling hlt and the next interrupt even though there 844 * is a runnable process. 845 */ 846void 847cpu_idle(void) 848{ 849#ifndef SMP 850 if (cpu_idle_hlt) { 851 disable_intr(); 852 if (procrunnable()) 853 enable_intr(); 854 else { 855 enable_intr(); 856 __asm __volatile("hlt"); 857 } 858 } 859#endif 860} 861 862/* 863 * Clear registers on exec 864 */ 865void 866setregs(td, entry, stack, ps_strings) 867 struct thread *td; 868 u_long entry; 869 u_long stack; 870 u_long ps_strings; 871{ 872 struct trapframe *regs = td->td_frame; 873 struct pcb *pcb = td->td_pcb; 874 875 if (td->td_proc->p_md.md_ldt) 876 user_ldt_free(td); 877 878 bzero((char *)regs, sizeof(struct trapframe)); 879 regs->tf_eip = entry; 880 regs->tf_esp = stack; 881 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T); 882 regs->tf_ss = _udatasel; 883 regs->tf_ds = _udatasel; 884 regs->tf_es = _udatasel; 885 regs->tf_fs = _udatasel; 886 regs->tf_cs = _ucodesel; 887 888 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */ 889 regs->tf_ebx = ps_strings; 890 891 /* reset %gs as well */ 892 if (pcb == PCPU_GET(curpcb)) 893 load_gs(_udatasel); 894 else 895 pcb->pcb_gs = _udatasel; 896 897 /* 898 * Reset the hardware debug registers if they were in use. 899 * They won't have any meaning for the newly exec'd process. 900 */ 901 if (pcb->pcb_flags & PCB_DBREGS) { 902 pcb->pcb_dr0 = 0; 903 pcb->pcb_dr1 = 0; 904 pcb->pcb_dr2 = 0; 905 pcb->pcb_dr3 = 0; 906 pcb->pcb_dr6 = 0; 907 pcb->pcb_dr7 = 0; 908 if (pcb == PCPU_GET(curpcb)) { 909 /* 910 * Clear the debug registers on the running 911 * CPU, otherwise they will end up affecting 912 * the next process we switch to. 913 */ 914 reset_dbregs(); 915 } 916 pcb->pcb_flags &= ~PCB_DBREGS; 917 } 918 919 /* 920 * Initialize the math emulator (if any) for the current process. 921 * Actually, just clear the bit that says that the emulator has 922 * been initialized. Initialization is delayed until the process 923 * traps to the emulator (if it is done at all) mainly because 924 * emulators don't provide an entry point for initialization. 925 */ 926 td->td_pcb->pcb_flags &= ~FP_SOFTFP; 927 928 /* 929 * Arrange to trap the next npx or `fwait' instruction (see npx.c 930 * for why fwait must be trapped at least if there is an npx or an 931 * emulator). This is mainly to handle the case where npx0 is not 932 * configured, since the npx routines normally set up the trap 933 * otherwise. It should be done only at boot time, but doing it 934 * here allows modifying `npx_exists' for testing the emulator on 935 * systems with an npx. 936 */ 937 load_cr0(rcr0() | CR0_MP | CR0_TS); 938 939#ifdef DEV_NPX 940 /* Initialize the npx (if any) for the current process. */ 941 npxinit(__INITIAL_NPXCW__); 942#endif 943 944 /* 945 * XXX - Linux emulator 946 * Make sure sure edx is 0x0 on entry. Linux binaries depend 947 * on it. 948 */ 949 td->td_retval[1] = 0; 950} 951 952void 953cpu_setregs(void) 954{ 955 unsigned int cr0; 956 957 cr0 = rcr0(); 958#ifdef SMP 959 cr0 |= CR0_NE; /* Done by npxinit() */ 960#endif 961 cr0 |= CR0_MP | CR0_TS; /* Done at every execve() too. */ 962#ifndef I386_CPU 963 cr0 |= CR0_WP | CR0_AM; 964#endif 965 load_cr0(cr0); 966 load_gs(_udatasel); 967} 968 969static int 970sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS) 971{ 972 int error; 973 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 974 req); 975 if (!error && req->newptr) 976 resettodr(); 977 return (error); 978} 979 980SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 981 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 982 983SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, 984 CTLFLAG_RW, &disable_rtc_set, 0, ""); 985 986SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo, 987 CTLFLAG_RD, &bootinfo, bootinfo, ""); 988 989SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock, 990 CTLFLAG_RW, &wall_cmos_clock, 0, ""); 991 992/* 993 * Initialize 386 and configure to run kernel 994 */ 995 996/* 997 * Initialize segments & interrupt table 998 */ 999 1000int _default_ldt; 1001union descriptor gdt[NGDT * MAXCPU]; /* global descriptor table */ 1002static struct gate_descriptor idt0[NIDT]; 1003struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */ 1004union descriptor ldt[NLDT]; /* local descriptor table */ 1005#ifdef SMP 1006/* table descriptors - used to load tables by microp */ 1007struct region_descriptor r_gdt, r_idt; 1008#endif 1009 1010int private_tss; /* flag indicating private tss */ 1011 1012#if defined(I586_CPU) && !defined(NO_F00F_HACK) 1013extern int has_f00f_bug; 1014#endif 1015 1016static struct i386tss dblfault_tss; 1017static char dblfault_stack[PAGE_SIZE]; 1018 1019extern struct user *proc0uarea; 1020extern vm_offset_t proc0kstack; 1021 1022 1023/* software prototypes -- in more palatable form */ 1024struct soft_segment_descriptor gdt_segs[] = { 1025/* GNULL_SEL 0 Null Descriptor */ 1026{ 0x0, /* segment base address */ 1027 0x0, /* length */ 1028 0, /* segment type */ 1029 0, /* segment descriptor priority level */ 1030 0, /* segment descriptor present */ 1031 0, 0, 1032 0, /* default 32 vs 16 bit size */ 1033 0 /* limit granularity (byte/page units)*/ }, 1034/* GCODE_SEL 1 Code Descriptor for kernel */ 1035{ 0x0, /* segment base address */ 1036 0xfffff, /* length - all address space */ 1037 SDT_MEMERA, /* segment type */ 1038 0, /* segment descriptor priority level */ 1039 1, /* segment descriptor present */ 1040 0, 0, 1041 1, /* default 32 vs 16 bit size */ 1042 1 /* limit granularity (byte/page units)*/ }, 1043/* GDATA_SEL 2 Data Descriptor for kernel */ 1044{ 0x0, /* segment base address */ 1045 0xfffff, /* length - all address space */ 1046 SDT_MEMRWA, /* segment type */ 1047 0, /* segment descriptor priority level */ 1048 1, /* segment descriptor present */ 1049 0, 0, 1050 1, /* default 32 vs 16 bit size */ 1051 1 /* limit granularity (byte/page units)*/ }, 1052/* GPRIV_SEL 3 SMP Per-Processor Private Data Descriptor */ 1053{ 0x0, /* segment base address */ 1054 0xfffff, /* length - all address space */ 1055 SDT_MEMRWA, /* segment type */ 1056 0, /* segment descriptor priority level */ 1057 1, /* segment descriptor present */ 1058 0, 0, 1059 1, /* default 32 vs 16 bit size */ 1060 1 /* limit granularity (byte/page units)*/ }, 1061/* GPROC0_SEL 4 Proc 0 Tss Descriptor */ 1062{ 1063 0x0, /* segment base address */ 1064 sizeof(struct i386tss)-1,/* length - all address space */ 1065 SDT_SYS386TSS, /* segment type */ 1066 0, /* segment descriptor priority level */ 1067 1, /* segment descriptor present */ 1068 0, 0, 1069 0, /* unused - default 32 vs 16 bit size */ 1070 0 /* limit granularity (byte/page units)*/ }, 1071/* GLDT_SEL 5 LDT Descriptor */ 1072{ (int) ldt, /* segment base address */ 1073 sizeof(ldt)-1, /* length - all address space */ 1074 SDT_SYSLDT, /* segment type */ 1075 SEL_UPL, /* segment descriptor priority level */ 1076 1, /* segment descriptor present */ 1077 0, 0, 1078 0, /* unused - default 32 vs 16 bit size */ 1079 0 /* limit granularity (byte/page units)*/ }, 1080/* GUSERLDT_SEL 6 User LDT Descriptor per process */ 1081{ (int) ldt, /* segment base address */ 1082 (512 * sizeof(union descriptor)-1), /* length */ 1083 SDT_SYSLDT, /* segment type */ 1084 0, /* segment descriptor priority level */ 1085 1, /* segment descriptor present */ 1086 0, 0, 1087 0, /* unused - default 32 vs 16 bit size */ 1088 0 /* limit granularity (byte/page units)*/ }, 1089/* GTGATE_SEL 7 Null Descriptor - Placeholder */ 1090{ 0x0, /* segment base address */ 1091 0x0, /* length - all address space */ 1092 0, /* segment type */ 1093 0, /* segment descriptor priority level */ 1094 0, /* segment descriptor present */ 1095 0, 0, 1096 0, /* default 32 vs 16 bit size */ 1097 0 /* limit granularity (byte/page units)*/ }, 1098/* GBIOSLOWMEM_SEL 8 BIOS access to realmode segment 0x40, must be #8 in GDT */ 1099{ 0x400, /* segment base address */ 1100 0xfffff, /* length */ 1101 SDT_MEMRWA, /* segment type */ 1102 0, /* segment descriptor priority level */ 1103 1, /* segment descriptor present */ 1104 0, 0, 1105 1, /* default 32 vs 16 bit size */ 1106 1 /* limit granularity (byte/page units)*/ }, 1107/* GPANIC_SEL 9 Panic Tss Descriptor */ 1108{ (int) &dblfault_tss, /* segment base address */ 1109 sizeof(struct i386tss)-1,/* length - all address space */ 1110 SDT_SYS386TSS, /* segment type */ 1111 0, /* segment descriptor priority level */ 1112 1, /* segment descriptor present */ 1113 0, 0, 1114 0, /* unused - default 32 vs 16 bit size */ 1115 0 /* limit granularity (byte/page units)*/ }, 1116/* GBIOSCODE32_SEL 10 BIOS 32-bit interface (32bit Code) */ 1117{ 0, /* segment base address (overwritten) */ 1118 0xfffff, /* length */ 1119 SDT_MEMERA, /* segment type */ 1120 0, /* segment descriptor priority level */ 1121 1, /* segment descriptor present */ 1122 0, 0, 1123 0, /* default 32 vs 16 bit size */ 1124 1 /* limit granularity (byte/page units)*/ }, 1125/* GBIOSCODE16_SEL 11 BIOS 32-bit interface (16bit Code) */ 1126{ 0, /* segment base address (overwritten) */ 1127 0xfffff, /* length */ 1128 SDT_MEMERA, /* segment type */ 1129 0, /* segment descriptor priority level */ 1130 1, /* segment descriptor present */ 1131 0, 0, 1132 0, /* default 32 vs 16 bit size */ 1133 1 /* limit granularity (byte/page units)*/ }, 1134/* GBIOSDATA_SEL 12 BIOS 32-bit interface (Data) */ 1135{ 0, /* segment base address (overwritten) */ 1136 0xfffff, /* length */ 1137 SDT_MEMRWA, /* segment type */ 1138 0, /* segment descriptor priority level */ 1139 1, /* segment descriptor present */ 1140 0, 0, 1141 1, /* default 32 vs 16 bit size */ 1142 1 /* limit granularity (byte/page units)*/ }, 1143/* GBIOSUTIL_SEL 13 BIOS 16-bit interface (Utility) */ 1144{ 0, /* segment base address (overwritten) */ 1145 0xfffff, /* length */ 1146 SDT_MEMRWA, /* segment type */ 1147 0, /* segment descriptor priority level */ 1148 1, /* segment descriptor present */ 1149 0, 0, 1150 0, /* default 32 vs 16 bit size */ 1151 1 /* limit granularity (byte/page units)*/ }, 1152/* GBIOSARGS_SEL 14 BIOS 16-bit interface (Arguments) */ 1153{ 0, /* segment base address (overwritten) */ 1154 0xfffff, /* length */ 1155 SDT_MEMRWA, /* segment type */ 1156 0, /* segment descriptor priority level */ 1157 1, /* segment descriptor present */ 1158 0, 0, 1159 0, /* default 32 vs 16 bit size */ 1160 1 /* limit granularity (byte/page units)*/ }, 1161}; 1162 1163static struct soft_segment_descriptor ldt_segs[] = { 1164 /* Null Descriptor - overwritten by call gate */ 1165{ 0x0, /* segment base address */ 1166 0x0, /* length - all address space */ 1167 0, /* segment type */ 1168 0, /* segment descriptor priority level */ 1169 0, /* segment descriptor present */ 1170 0, 0, 1171 0, /* default 32 vs 16 bit size */ 1172 0 /* limit granularity (byte/page units)*/ }, 1173 /* Null Descriptor - overwritten by call gate */ 1174{ 0x0, /* segment base address */ 1175 0x0, /* length - all address space */ 1176 0, /* segment type */ 1177 0, /* segment descriptor priority level */ 1178 0, /* segment descriptor present */ 1179 0, 0, 1180 0, /* default 32 vs 16 bit size */ 1181 0 /* limit granularity (byte/page units)*/ }, 1182 /* Null Descriptor - overwritten by call gate */ 1183{ 0x0, /* segment base address */ 1184 0x0, /* length - all address space */ 1185 0, /* segment type */ 1186 0, /* segment descriptor priority level */ 1187 0, /* segment descriptor present */ 1188 0, 0, 1189 0, /* default 32 vs 16 bit size */ 1190 0 /* limit granularity (byte/page units)*/ }, 1191 /* Code Descriptor for user */ 1192{ 0x0, /* segment base address */ 1193 0xfffff, /* length - all address space */ 1194 SDT_MEMERA, /* segment type */ 1195 SEL_UPL, /* segment descriptor priority level */ 1196 1, /* segment descriptor present */ 1197 0, 0, 1198 1, /* default 32 vs 16 bit size */ 1199 1 /* limit granularity (byte/page units)*/ }, 1200 /* Null Descriptor - overwritten by call gate */ 1201{ 0x0, /* segment base address */ 1202 0x0, /* length - all address space */ 1203 0, /* segment type */ 1204 0, /* segment descriptor priority level */ 1205 0, /* segment descriptor present */ 1206 0, 0, 1207 0, /* default 32 vs 16 bit size */ 1208 0 /* limit granularity (byte/page units)*/ }, 1209 /* Data Descriptor for user */ 1210{ 0x0, /* segment base address */ 1211 0xfffff, /* length - all address space */ 1212 SDT_MEMRWA, /* segment type */ 1213 SEL_UPL, /* segment descriptor priority level */ 1214 1, /* segment descriptor present */ 1215 0, 0, 1216 1, /* default 32 vs 16 bit size */ 1217 1 /* limit granularity (byte/page units)*/ }, 1218}; 1219 1220void 1221setidt(idx, func, typ, dpl, selec) 1222 int idx; 1223 inthand_t *func; 1224 int typ; 1225 int dpl; 1226 int selec; 1227{ 1228 struct gate_descriptor *ip; 1229 1230 ip = idt + idx; 1231 ip->gd_looffset = (int)func; 1232 ip->gd_selector = selec; 1233 ip->gd_stkcpy = 0; 1234 ip->gd_xx = 0; 1235 ip->gd_type = typ; 1236 ip->gd_dpl = dpl; 1237 ip->gd_p = 1; 1238 ip->gd_hioffset = ((int)func)>>16 ; 1239} 1240 1241#define IDTVEC(name) __CONCAT(X,name) 1242 1243extern inthand_t 1244 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 1245 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 1246 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 1247 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 1248 IDTVEC(xmm), IDTVEC(lcall_syscall), IDTVEC(int0x80_syscall); 1249 1250void 1251sdtossd(sd, ssd) 1252 struct segment_descriptor *sd; 1253 struct soft_segment_descriptor *ssd; 1254{ 1255 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 1256 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 1257 ssd->ssd_type = sd->sd_type; 1258 ssd->ssd_dpl = sd->sd_dpl; 1259 ssd->ssd_p = sd->sd_p; 1260 ssd->ssd_def32 = sd->sd_def32; 1261 ssd->ssd_gran = sd->sd_gran; 1262} 1263 1264#define PHYSMAP_SIZE (2 * 8) 1265 1266/* 1267 * Populate the (physmap) array with base/bound pairs describing the 1268 * available physical memory in the system, then test this memory and 1269 * build the phys_avail array describing the actually-available memory. 1270 * 1271 * If we cannot accurately determine the physical memory map, then use 1272 * value from the 0xE801 call, and failing that, the RTC. 1273 * 1274 * Total memory size may be set by the kernel environment variable 1275 * hw.physmem or the compile-time define MAXMEM. 1276 */ 1277static void 1278getmemsize(int first) 1279{ 1280 int i, physmap_idx, pa_indx; 1281 u_int basemem, extmem; 1282 struct vm86frame vmf; 1283 struct vm86context vmc; 1284 vm_offset_t pa, physmap[PHYSMAP_SIZE]; 1285 pt_entry_t *pte; 1286 const char *cp; 1287 struct bios_smap *smap; 1288 1289 bzero(&vmf, sizeof(struct vm86frame)); 1290 bzero(physmap, sizeof(physmap)); 1291 1292 /* 1293 * Perform "base memory" related probes & setup 1294 */ 1295 vm86_intcall(0x12, &vmf); 1296 basemem = vmf.vmf_ax; 1297 if (basemem > 640) { 1298 printf("Preposterous BIOS basemem of %uK, truncating to 640K\n", 1299 basemem); 1300 basemem = 640; 1301 } 1302 1303 /* 1304 * XXX if biosbasemem is now < 640, there is a `hole' 1305 * between the end of base memory and the start of 1306 * ISA memory. The hole may be empty or it may 1307 * contain BIOS code or data. Map it read/write so 1308 * that the BIOS can write to it. (Memory from 0 to 1309 * the physical end of the kernel is mapped read-only 1310 * to begin with and then parts of it are remapped. 1311 * The parts that aren't remapped form holes that 1312 * remain read-only and are unused by the kernel. 1313 * The base memory area is below the physical end of 1314 * the kernel and right now forms a read-only hole. 1315 * The part of it from PAGE_SIZE to 1316 * (trunc_page(biosbasemem * 1024) - 1) will be 1317 * remapped and used by the kernel later.) 1318 * 1319 * This code is similar to the code used in 1320 * pmap_mapdev, but since no memory needs to be 1321 * allocated we simply change the mapping. 1322 */ 1323 for (pa = trunc_page(basemem * 1024); 1324 pa < ISA_HOLE_START; pa += PAGE_SIZE) { 1325 pte = vtopte(pa + KERNBASE); 1326 *pte = pa | PG_RW | PG_V; 1327 } 1328 1329 /* 1330 * if basemem != 640, map pages r/w into vm86 page table so 1331 * that the bios can scribble on it. 1332 */ 1333 pte = (pt_entry_t *)vm86paddr; 1334 for (i = basemem / 4; i < 160; i++) 1335 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U; 1336 1337 /* 1338 * map page 1 R/W into the kernel page table so we can use it 1339 * as a buffer. The kernel will unmap this page later. 1340 */ 1341 pte = vtopte(KERNBASE + (1 << PAGE_SHIFT)); 1342 *pte = (1 << PAGE_SHIFT) | PG_RW | PG_V; 1343 1344 /* 1345 * get memory map with INT 15:E820 1346 */ 1347 vmc.npages = 0; 1348 smap = (void *)vm86_addpage(&vmc, 1, KERNBASE + (1 << PAGE_SHIFT)); 1349 vm86_getptr(&vmc, (vm_offset_t)smap, &vmf.vmf_es, &vmf.vmf_di); 1350 1351 physmap_idx = 0; 1352 vmf.vmf_ebx = 0; 1353 do { 1354 vmf.vmf_eax = 0xE820; 1355 vmf.vmf_edx = SMAP_SIG; 1356 vmf.vmf_ecx = sizeof(struct bios_smap); 1357 i = vm86_datacall(0x15, &vmf, &vmc); 1358 if (i || vmf.vmf_eax != SMAP_SIG) 1359 break; 1360 if (boothowto & RB_VERBOSE) 1361 printf("SMAP type=%02x base=%08x %08x len=%08x %08x\n", 1362 smap->type, 1363 *(u_int32_t *)((char *)&smap->base + 4), 1364 (u_int32_t)smap->base, 1365 *(u_int32_t *)((char *)&smap->length + 4), 1366 (u_int32_t)smap->length); 1367 1368 if (smap->type != 0x01) 1369 goto next_run; 1370 1371 if (smap->length == 0) 1372 goto next_run; 1373 1374 if (smap->base >= 0xffffffff) { 1375 printf("%uK of memory above 4GB ignored\n", 1376 (u_int)(smap->length / 1024)); 1377 goto next_run; 1378 } 1379 1380 for (i = 0; i <= physmap_idx; i += 2) { 1381 if (smap->base < physmap[i + 1]) { 1382 if (boothowto & RB_VERBOSE) 1383 printf( 1384 "Overlapping or non-montonic memory region, ignoring second region\n"); 1385 goto next_run; 1386 } 1387 } 1388 1389 if (smap->base == physmap[physmap_idx + 1]) { 1390 physmap[physmap_idx + 1] += smap->length; 1391 goto next_run; 1392 } 1393 1394 physmap_idx += 2; 1395 if (physmap_idx == PHYSMAP_SIZE) { 1396 printf( 1397 "Too many segments in the physical address map, giving up\n"); 1398 break; 1399 } 1400 physmap[physmap_idx] = smap->base; 1401 physmap[physmap_idx + 1] = smap->base + smap->length; 1402next_run: 1403 } while (vmf.vmf_ebx != 0); 1404 1405 if (physmap[1] != 0) 1406 goto physmap_done; 1407 1408 /* 1409 * If we failed above, try memory map with INT 15:E801 1410 */ 1411 vmf.vmf_ax = 0xE801; 1412 if (vm86_intcall(0x15, &vmf) == 0) { 1413 extmem = vmf.vmf_cx + vmf.vmf_dx * 64; 1414 } else { 1415#if 0 1416 vmf.vmf_ah = 0x88; 1417 vm86_intcall(0x15, &vmf); 1418 extmem = vmf.vmf_ax; 1419#else 1420 /* 1421 * Prefer the RTC value for extended memory. 1422 */ 1423 extmem = rtcin(RTC_EXTLO) + (rtcin(RTC_EXTHI) << 8); 1424#endif 1425 } 1426 1427 /* 1428 * Special hack for chipsets that still remap the 384k hole when 1429 * there's 16MB of memory - this really confuses people that 1430 * are trying to use bus mastering ISA controllers with the 1431 * "16MB limit"; they only have 16MB, but the remapping puts 1432 * them beyond the limit. 1433 * 1434 * If extended memory is between 15-16MB (16-17MB phys address range), 1435 * chop it to 15MB. 1436 */ 1437 if ((extmem > 15 * 1024) && (extmem < 16 * 1024)) 1438 extmem = 15 * 1024; 1439 1440 physmap[0] = 0; 1441 physmap[1] = basemem * 1024; 1442 physmap_idx = 2; 1443 physmap[physmap_idx] = 0x100000; 1444 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024; 1445 1446physmap_done: 1447 /* 1448 * Now, physmap contains a map of physical memory. 1449 */ 1450 1451#ifdef SMP 1452 /* make hole for AP bootstrap code */ 1453 physmap[1] = mp_bootaddress(physmap[1] / 1024); 1454 1455 /* look for the MP hardware - needed for apic addresses */ 1456 i386_mp_probe(); 1457#endif 1458 1459 /* 1460 * Maxmem isn't the "maximum memory", it's one larger than the 1461 * highest page of the physical address space. It should be 1462 * called something like "Maxphyspage". We may adjust this 1463 * based on ``hw.physmem'' and the results of the memory test. 1464 */ 1465 Maxmem = atop(physmap[physmap_idx + 1]); 1466 1467#ifdef MAXMEM 1468 Maxmem = MAXMEM / 4; 1469#endif 1470 1471 /* 1472 * hw.physmem is a size in bytes; we also allow k, m, and g suffixes 1473 * for the appropriate modifiers. This overrides MAXMEM. 1474 */ 1475 if ((cp = getenv("hw.physmem")) != NULL) { 1476 u_int64_t AllowMem, sanity; 1477 char *ep; 1478 1479 sanity = AllowMem = strtouq(cp, &ep, 0); 1480 if ((ep != cp) && (*ep != 0)) { 1481 switch(*ep) { 1482 case 'g': 1483 case 'G': 1484 AllowMem <<= 10; 1485 case 'm': 1486 case 'M': 1487 AllowMem <<= 10; 1488 case 'k': 1489 case 'K': 1490 AllowMem <<= 10; 1491 break; 1492 default: 1493 AllowMem = sanity = 0; 1494 } 1495 if (AllowMem < sanity) 1496 AllowMem = 0; 1497 } 1498 if (AllowMem == 0) 1499 printf("Ignoring invalid memory size of '%s'\n", cp); 1500 else 1501 Maxmem = atop(AllowMem); 1502 } 1503 1504 if (atop(physmap[physmap_idx + 1]) != Maxmem && 1505 (boothowto & RB_VERBOSE)) 1506 printf("Physical memory use set to %uK\n", Maxmem * 4); 1507 1508 /* 1509 * If Maxmem has been increased beyond what the system has detected, 1510 * extend the last memory segment to the new limit. 1511 */ 1512 if (atop(physmap[physmap_idx + 1]) < Maxmem) 1513 physmap[physmap_idx + 1] = ptoa(Maxmem); 1514 1515 /* call pmap initialization to make new kernel address space */ 1516 pmap_bootstrap(first, 0); 1517 1518 /* 1519 * Size up each available chunk of physical memory. 1520 */ 1521 physmap[0] = PAGE_SIZE; /* mask off page 0 */ 1522 pa_indx = 0; 1523 phys_avail[pa_indx++] = physmap[0]; 1524 phys_avail[pa_indx] = physmap[0]; 1525#if 0 1526 pte = vtopte(KERNBASE); 1527#else 1528 pte = CMAP1; 1529#endif 1530 1531 /* 1532 * physmap is in bytes, so when converting to page boundaries, 1533 * round up the start address and round down the end address. 1534 */ 1535 for (i = 0; i <= physmap_idx; i += 2) { 1536 vm_offset_t end; 1537 1538 end = ptoa(Maxmem); 1539 if (physmap[i + 1] < end) 1540 end = trunc_page(physmap[i + 1]); 1541 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) { 1542 int tmp, page_bad; 1543#if 0 1544 int *ptr = 0; 1545#else 1546 int *ptr = (int *)CADDR1; 1547#endif 1548 1549 /* 1550 * block out kernel memory as not available. 1551 */ 1552 if (pa >= 0x100000 && pa < first) 1553 continue; 1554 1555 page_bad = FALSE; 1556 1557 /* 1558 * map page into kernel: valid, read/write,non-cacheable 1559 */ 1560 *pte = pa | PG_V | PG_RW | PG_N; 1561 invltlb(); 1562 1563 tmp = *(int *)ptr; 1564 /* 1565 * Test for alternating 1's and 0's 1566 */ 1567 *(volatile int *)ptr = 0xaaaaaaaa; 1568 if (*(volatile int *)ptr != 0xaaaaaaaa) { 1569 page_bad = TRUE; 1570 } 1571 /* 1572 * Test for alternating 0's and 1's 1573 */ 1574 *(volatile int *)ptr = 0x55555555; 1575 if (*(volatile int *)ptr != 0x55555555) { 1576 page_bad = TRUE; 1577 } 1578 /* 1579 * Test for all 1's 1580 */ 1581 *(volatile int *)ptr = 0xffffffff; 1582 if (*(volatile int *)ptr != 0xffffffff) { 1583 page_bad = TRUE; 1584 } 1585 /* 1586 * Test for all 0's 1587 */ 1588 *(volatile int *)ptr = 0x0; 1589 if (*(volatile int *)ptr != 0x0) { 1590 page_bad = TRUE; 1591 } 1592 /* 1593 * Restore original value. 1594 */ 1595 *(int *)ptr = tmp; 1596 1597 /* 1598 * Adjust array of valid/good pages. 1599 */ 1600 if (page_bad == TRUE) { 1601 continue; 1602 } 1603 /* 1604 * If this good page is a continuation of the 1605 * previous set of good pages, then just increase 1606 * the end pointer. Otherwise start a new chunk. 1607 * Note that "end" points one higher than end, 1608 * making the range >= start and < end. 1609 * If we're also doing a speculative memory 1610 * test and we at or past the end, bump up Maxmem 1611 * so that we keep going. The first bad page 1612 * will terminate the loop. 1613 */ 1614 if (phys_avail[pa_indx] == pa) { 1615 phys_avail[pa_indx] += PAGE_SIZE; 1616 } else { 1617 pa_indx++; 1618 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 1619 printf( 1620 "Too many holes in the physical address space, giving up\n"); 1621 pa_indx--; 1622 break; 1623 } 1624 phys_avail[pa_indx++] = pa; /* start */ 1625 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */ 1626 } 1627 physmem++; 1628 } 1629 } 1630 *pte = 0; 1631 invltlb(); 1632 1633 /* 1634 * XXX 1635 * The last chunk must contain at least one page plus the message 1636 * buffer to avoid complicating other code (message buffer address 1637 * calculation, etc.). 1638 */ 1639 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 1640 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) { 1641 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 1642 phys_avail[pa_indx--] = 0; 1643 phys_avail[pa_indx--] = 0; 1644 } 1645 1646 Maxmem = atop(phys_avail[pa_indx]); 1647 1648 /* Trim off space for the message buffer. */ 1649 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE); 1650 1651 avail_end = phys_avail[pa_indx]; 1652} 1653 1654void 1655init386(first) 1656 int first; 1657{ 1658 struct gate_descriptor *gdp; 1659 int gsel_tss, metadata_missing, off, x; 1660#ifndef SMP 1661 /* table descriptors - used to load tables by microp */ 1662 struct region_descriptor r_gdt, r_idt; 1663#endif 1664 struct pcpu *pc; 1665 1666 proc_linkup(&proc0); 1667 proc0.p_uarea = proc0uarea; 1668 thread0 = &proc0.p_thread; 1669 thread0->td_kstack = proc0kstack; 1670 thread0->td_pcb = (struct pcb *) 1671 (thread0->td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1; 1672 atdevbase = ISA_HOLE_START + KERNBASE; 1673 1674 metadata_missing = 0; 1675 if (bootinfo.bi_modulep) { 1676 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE; 1677 preload_bootstrap_relocate(KERNBASE); 1678 } else { 1679 metadata_missing = 1; 1680 } 1681 if (envmode == 1) 1682 kern_envp = static_env; 1683 else if (bootinfo.bi_envp) 1684 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE; 1685 1686 /* Init basic tunables, hz etc */ 1687 init_param1(); 1688 1689 /* 1690 * make gdt memory segments, the code segment goes up to end of the 1691 * page with etext in it, the data segment goes to the end of 1692 * the address space 1693 */ 1694 /* 1695 * XXX text protection is temporarily (?) disabled. The limit was 1696 * i386_btop(round_page(etext)) - 1. 1697 */ 1698 gdt_segs[GCODE_SEL].ssd_limit = atop(0 - 1); 1699 gdt_segs[GDATA_SEL].ssd_limit = atop(0 - 1); 1700#ifdef SMP 1701 pc = &SMP_prvspace[0]; 1702 gdt_segs[GPRIV_SEL].ssd_limit = 1703 atop(sizeof(struct privatespace) - 1); 1704#else 1705 pc = &__pcpu; 1706 gdt_segs[GPRIV_SEL].ssd_limit = 1707 atop(sizeof(struct pcpu) - 1); 1708#endif 1709 gdt_segs[GPRIV_SEL].ssd_base = (int) pc; 1710 gdt_segs[GPROC0_SEL].ssd_base = (int) &pc->pc_common_tss; 1711 1712 for (x = 0; x < NGDT; x++) { 1713#ifdef BDE_DEBUGGER 1714 /* avoid overwriting db entries with APM ones */ 1715 if (x >= GAPMCODE32_SEL && x <= GAPMDATA_SEL) 1716 continue; 1717#endif 1718 ssdtosd(&gdt_segs[x], &gdt[x].sd); 1719 } 1720 1721 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1; 1722 r_gdt.rd_base = (int) gdt; 1723 lgdt(&r_gdt); 1724 1725 pcpu_init(pc, 0, sizeof(struct pcpu)); 1726 PCPU_SET(prvspace, pc); 1727 1728 /* setup curproc so that mutexes work */ 1729 PCPU_SET(curthread, thread0); 1730 1731 LIST_INIT(&thread0->td_contested); 1732 1733 /* 1734 * Initialize mutexes. 1735 */ 1736 mtx_init(&Giant, "Giant", MTX_DEF | MTX_RECURSE); 1737 mtx_init(&sched_lock, "sched lock", MTX_SPIN | MTX_RECURSE); 1738 mtx_init(&proc0.p_mtx, "process lock", MTX_DEF); 1739 mtx_init(&clock_lock, "clk", MTX_SPIN | MTX_RECURSE); 1740 mtx_init(&icu_lock, "icu", MTX_SPIN); 1741 mtx_lock(&Giant); 1742 1743 /* make ldt memory segments */ 1744 /* 1745 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it 1746 * should be spelled ...MAX_USER... 1747 */ 1748 ldt_segs[LUCODE_SEL].ssd_limit = atop(VM_MAXUSER_ADDRESS - 1); 1749 ldt_segs[LUDATA_SEL].ssd_limit = atop(VM_MAXUSER_ADDRESS - 1); 1750 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++) 1751 ssdtosd(&ldt_segs[x], &ldt[x].sd); 1752 1753 _default_ldt = GSEL(GLDT_SEL, SEL_KPL); 1754 lldt(_default_ldt); 1755 PCPU_SET(currentldt, _default_ldt); 1756 1757 /* exceptions */ 1758 for (x = 0; x < NIDT; x++) 1759 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, 1760 GSEL(GCODE_SEL, SEL_KPL)); 1761 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, 1762 GSEL(GCODE_SEL, SEL_KPL)); 1763 setidt(1, &IDTVEC(dbg), SDT_SYS386IGT, SEL_KPL, 1764 GSEL(GCODE_SEL, SEL_KPL)); 1765 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, 1766 GSEL(GCODE_SEL, SEL_KPL)); 1767 setidt(3, &IDTVEC(bpt), SDT_SYS386IGT, SEL_UPL, 1768 GSEL(GCODE_SEL, SEL_KPL)); 1769 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, 1770 GSEL(GCODE_SEL, SEL_KPL)); 1771 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, 1772 GSEL(GCODE_SEL, SEL_KPL)); 1773 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, 1774 GSEL(GCODE_SEL, SEL_KPL)); 1775 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL 1776 , GSEL(GCODE_SEL, SEL_KPL)); 1777 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL)); 1778 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, 1779 GSEL(GCODE_SEL, SEL_KPL)); 1780 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, 1781 GSEL(GCODE_SEL, SEL_KPL)); 1782 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, 1783 GSEL(GCODE_SEL, SEL_KPL)); 1784 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, 1785 GSEL(GCODE_SEL, SEL_KPL)); 1786 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, 1787 GSEL(GCODE_SEL, SEL_KPL)); 1788 setidt(14, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL, 1789 GSEL(GCODE_SEL, SEL_KPL)); 1790 setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, 1791 GSEL(GCODE_SEL, SEL_KPL)); 1792 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, 1793 GSEL(GCODE_SEL, SEL_KPL)); 1794 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, 1795 GSEL(GCODE_SEL, SEL_KPL)); 1796 setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, 1797 GSEL(GCODE_SEL, SEL_KPL)); 1798 setidt(19, &IDTVEC(xmm), SDT_SYS386TGT, SEL_KPL, 1799 GSEL(GCODE_SEL, SEL_KPL)); 1800 setidt(0x80, &IDTVEC(int0x80_syscall), SDT_SYS386TGT, SEL_UPL, 1801 GSEL(GCODE_SEL, SEL_KPL)); 1802 1803 r_idt.rd_limit = sizeof(idt0) - 1; 1804 r_idt.rd_base = (int) idt; 1805 lidt(&r_idt); 1806 1807 /* 1808 * Initialize the console before we print anything out. 1809 */ 1810 cninit(); 1811 1812 if (metadata_missing) 1813 printf("WARNING: loader(8) metadata is missing!\n"); 1814 1815#ifdef DEV_ISA 1816 isa_defaultirq(); 1817#endif 1818 1819#ifdef DDB 1820 kdb_init(); 1821 if (boothowto & RB_KDB) 1822 Debugger("Boot flags requested debugger"); 1823#endif 1824 1825 finishidentcpu(); /* Final stage of CPU initialization */ 1826 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, 1827 GSEL(GCODE_SEL, SEL_KPL)); 1828 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, 1829 GSEL(GCODE_SEL, SEL_KPL)); 1830 initializecpu(); /* Initialize CPU registers */ 1831 1832 /* make an initial tss so cpu can get interrupt stack on syscall! */ 1833 /* Note: -16 is so we can grow the trapframe if we came from vm86 */ 1834 PCPU_SET(common_tss.tss_esp0, thread0->td_kstack + 1835 KSTACK_PAGES * PAGE_SIZE - sizeof(struct pcb) - 16); 1836 PCPU_SET(common_tss.tss_ss0, GSEL(GDATA_SEL, SEL_KPL)); 1837 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 1838 private_tss = 0; 1839 PCPU_SET(tss_gdt, &gdt[GPROC0_SEL].sd); 1840 PCPU_SET(common_tssd, *PCPU_GET(tss_gdt)); 1841 PCPU_SET(common_tss.tss_ioopt, (sizeof (struct i386tss)) << 16); 1842 ltr(gsel_tss); 1843 1844 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 = 1845 dblfault_tss.tss_esp2 = (int)&dblfault_stack[sizeof(dblfault_stack)]; 1846 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 = 1847 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL); 1848 dblfault_tss.tss_cr3 = (int)IdlePTD; 1849 dblfault_tss.tss_eip = (int)dblfault_handler; 1850 dblfault_tss.tss_eflags = PSL_KERNEL; 1851 dblfault_tss.tss_ds = dblfault_tss.tss_es = 1852 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL); 1853 dblfault_tss.tss_fs = GSEL(GPRIV_SEL, SEL_KPL); 1854 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL); 1855 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL); 1856 1857 vm86_initialize(); 1858 getmemsize(first); 1859 init_param2(physmem); 1860 1861 /* now running on new page tables, configured,and u/iom is accessible */ 1862 1863 /* Map the message buffer. */ 1864 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE) 1865 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off); 1866 1867 msgbufinit(msgbufp, MSGBUF_SIZE); 1868 1869 /* make a call gate to reenter kernel with */ 1870 gdp = &ldt[LSYS5CALLS_SEL].gd; 1871 1872 x = (int) &IDTVEC(lcall_syscall); 1873 gdp->gd_looffset = x; 1874 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL); 1875 gdp->gd_stkcpy = 1; 1876 gdp->gd_type = SDT_SYS386CGT; 1877 gdp->gd_dpl = SEL_UPL; 1878 gdp->gd_p = 1; 1879 gdp->gd_hioffset = x >> 16; 1880 1881 /* XXX does this work? */ 1882 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL]; 1883 ldt[LSOL26CALLS_SEL] = ldt[LSYS5CALLS_SEL]; 1884 1885 /* transfer to user mode */ 1886 1887 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL); 1888 _udatasel = LSEL(LUDATA_SEL, SEL_UPL); 1889 1890 /* setup proc 0's pcb */ 1891 thread0->td_pcb->pcb_flags = 0; /* XXXKSE */ 1892 thread0->td_pcb->pcb_cr3 = (int)IdlePTD; 1893 thread0->td_pcb->pcb_ext = 0; 1894 thread0->td_frame = &proc0_tf; 1895} 1896 1897void 1898cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size) 1899{ 1900} 1901 1902#if defined(I586_CPU) && !defined(NO_F00F_HACK) 1903static void f00f_hack(void *unused); 1904SYSINIT(f00f_hack, SI_SUB_INTRINSIC, SI_ORDER_FIRST, f00f_hack, NULL); 1905 1906static void 1907f00f_hack(void *unused) { 1908 struct gate_descriptor *new_idt; 1909#ifndef SMP 1910 struct region_descriptor r_idt; 1911#endif 1912 vm_offset_t tmp; 1913 1914 if (!has_f00f_bug) 1915 return; 1916 1917 GIANT_REQUIRED; 1918 1919 printf("Intel Pentium detected, installing workaround for F00F bug\n"); 1920 1921 r_idt.rd_limit = sizeof(idt0) - 1; 1922 1923 tmp = kmem_alloc(kernel_map, PAGE_SIZE * 2); 1924 if (tmp == 0) 1925 panic("kmem_alloc returned 0"); 1926 if (((unsigned int)tmp & (PAGE_SIZE-1)) != 0) 1927 panic("kmem_alloc returned non-page-aligned memory"); 1928 /* Put the first seven entries in the lower page */ 1929 new_idt = (struct gate_descriptor*)(tmp + PAGE_SIZE - (7*8)); 1930 bcopy(idt, new_idt, sizeof(idt0)); 1931 r_idt.rd_base = (int)new_idt; 1932 lidt(&r_idt); 1933 idt = new_idt; 1934 if (vm_map_protect(kernel_map, tmp, tmp + PAGE_SIZE, 1935 VM_PROT_READ, FALSE) != KERN_SUCCESS) 1936 panic("vm_map_protect failed"); 1937 return; 1938} 1939#endif /* defined(I586_CPU) && !NO_F00F_HACK */ 1940 1941int 1942ptrace_set_pc(struct thread *td, unsigned long addr) 1943{ 1944 td->td_frame->tf_eip = addr; 1945 return (0); 1946} 1947 1948int 1949ptrace_single_step(struct thread *td) 1950{ 1951 td->td_frame->tf_eflags |= PSL_T; 1952 return (0); 1953} 1954 1955int 1956fill_regs(struct thread *td, struct reg *regs) 1957{ 1958 struct pcb *pcb; 1959 struct trapframe *tp; 1960 1961 tp = td->td_frame; 1962 regs->r_fs = tp->tf_fs; 1963 regs->r_es = tp->tf_es; 1964 regs->r_ds = tp->tf_ds; 1965 regs->r_edi = tp->tf_edi; 1966 regs->r_esi = tp->tf_esi; 1967 regs->r_ebp = tp->tf_ebp; 1968 regs->r_ebx = tp->tf_ebx; 1969 regs->r_edx = tp->tf_edx; 1970 regs->r_ecx = tp->tf_ecx; 1971 regs->r_eax = tp->tf_eax; 1972 regs->r_eip = tp->tf_eip; 1973 regs->r_cs = tp->tf_cs; 1974 regs->r_eflags = tp->tf_eflags; 1975 regs->r_esp = tp->tf_esp; 1976 regs->r_ss = tp->tf_ss; 1977 pcb = td->td_pcb; 1978 regs->r_gs = pcb->pcb_gs; 1979 return (0); 1980} 1981 1982int 1983set_regs(struct thread *td, struct reg *regs) 1984{ 1985 struct pcb *pcb; 1986 struct trapframe *tp; 1987 1988 tp = td->td_frame; 1989 if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) || 1990 !CS_SECURE(regs->r_cs)) 1991 return (EINVAL); 1992 tp->tf_fs = regs->r_fs; 1993 tp->tf_es = regs->r_es; 1994 tp->tf_ds = regs->r_ds; 1995 tp->tf_edi = regs->r_edi; 1996 tp->tf_esi = regs->r_esi; 1997 tp->tf_ebp = regs->r_ebp; 1998 tp->tf_ebx = regs->r_ebx; 1999 tp->tf_edx = regs->r_edx; 2000 tp->tf_ecx = regs->r_ecx; 2001 tp->tf_eax = regs->r_eax; 2002 tp->tf_eip = regs->r_eip; 2003 tp->tf_cs = regs->r_cs; 2004 tp->tf_eflags = regs->r_eflags; 2005 tp->tf_esp = regs->r_esp; 2006 tp->tf_ss = regs->r_ss; 2007 pcb = td->td_pcb; 2008 pcb->pcb_gs = regs->r_gs; 2009 return (0); 2010} 2011 2012#ifdef CPU_ENABLE_SSE 2013static void 2014fill_fpregs_xmm(sv_xmm, sv_87) 2015 struct savexmm *sv_xmm; 2016 struct save87 *sv_87; 2017{ 2018 register struct env87 *penv_87 = &sv_87->sv_env; 2019 register struct envxmm *penv_xmm = &sv_xmm->sv_env; 2020 int i; 2021 2022 /* FPU control/status */ 2023 penv_87->en_cw = penv_xmm->en_cw; 2024 penv_87->en_sw = penv_xmm->en_sw; 2025 penv_87->en_tw = penv_xmm->en_tw; 2026 penv_87->en_fip = penv_xmm->en_fip; 2027 penv_87->en_fcs = penv_xmm->en_fcs; 2028 penv_87->en_opcode = penv_xmm->en_opcode; 2029 penv_87->en_foo = penv_xmm->en_foo; 2030 penv_87->en_fos = penv_xmm->en_fos; 2031 2032 /* FPU registers */ 2033 for (i = 0; i < 8; ++i) 2034 sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc; 2035 2036 sv_87->sv_ex_sw = sv_xmm->sv_ex_sw; 2037} 2038 2039static void 2040set_fpregs_xmm(sv_87, sv_xmm) 2041 struct save87 *sv_87; 2042 struct savexmm *sv_xmm; 2043{ 2044 register struct env87 *penv_87 = &sv_87->sv_env; 2045 register struct envxmm *penv_xmm = &sv_xmm->sv_env; 2046 int i; 2047 2048 /* FPU control/status */ 2049 penv_xmm->en_cw = penv_87->en_cw; 2050 penv_xmm->en_sw = penv_87->en_sw; 2051 penv_xmm->en_tw = penv_87->en_tw; 2052 penv_xmm->en_fip = penv_87->en_fip; 2053 penv_xmm->en_fcs = penv_87->en_fcs; 2054 penv_xmm->en_opcode = penv_87->en_opcode; 2055 penv_xmm->en_foo = penv_87->en_foo; 2056 penv_xmm->en_fos = penv_87->en_fos; 2057 2058 /* FPU registers */ 2059 for (i = 0; i < 8; ++i) 2060 sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i]; 2061 2062 sv_xmm->sv_ex_sw = sv_87->sv_ex_sw; 2063} 2064#endif /* CPU_ENABLE_SSE */ 2065 2066int 2067fill_fpregs(struct thread *td, struct fpreg *fpregs) 2068{ 2069#ifdef CPU_ENABLE_SSE 2070 if (cpu_fxsr) { 2071 fill_fpregs_xmm(&td->td_pcb->pcb_save.sv_xmm, 2072 (struct save87 *)fpregs); 2073 return (0); 2074 } 2075#endif /* CPU_ENABLE_SSE */ 2076 bcopy(&td->td_pcb->pcb_save.sv_87, fpregs, sizeof *fpregs); 2077 return (0); 2078} 2079 2080int 2081set_fpregs(struct thread *td, struct fpreg *fpregs) 2082{ 2083#ifdef CPU_ENABLE_SSE 2084 if (cpu_fxsr) { 2085 set_fpregs_xmm((struct save87 *)fpregs, 2086 &td->td_pcb->pcb_save.sv_xmm); 2087 return (0); 2088 } 2089#endif /* CPU_ENABLE_SSE */ 2090 bcopy(fpregs, &td->td_pcb->pcb_save.sv_87, sizeof *fpregs); 2091 return (0); 2092} 2093 2094int 2095fill_dbregs(struct thread *td, struct dbreg *dbregs) 2096{ 2097 struct pcb *pcb; 2098 2099 if (td == NULL) { 2100 dbregs->dr0 = rdr0(); 2101 dbregs->dr1 = rdr1(); 2102 dbregs->dr2 = rdr2(); 2103 dbregs->dr3 = rdr3(); 2104 dbregs->dr4 = rdr4(); 2105 dbregs->dr5 = rdr5(); 2106 dbregs->dr6 = rdr6(); 2107 dbregs->dr7 = rdr7(); 2108 } else { 2109 pcb = td->td_pcb; 2110 dbregs->dr0 = pcb->pcb_dr0; 2111 dbregs->dr1 = pcb->pcb_dr1; 2112 dbregs->dr2 = pcb->pcb_dr2; 2113 dbregs->dr3 = pcb->pcb_dr3; 2114 dbregs->dr4 = 0; 2115 dbregs->dr5 = 0; 2116 dbregs->dr6 = pcb->pcb_dr6; 2117 dbregs->dr7 = pcb->pcb_dr7; 2118 } 2119 return (0); 2120} 2121 2122int 2123set_dbregs(struct thread *td, struct dbreg *dbregs) 2124{ 2125 struct pcb *pcb; 2126 int i; 2127 u_int32_t mask1, mask2; 2128 2129 if (td == NULL) { 2130 load_dr0(dbregs->dr0); 2131 load_dr1(dbregs->dr1); 2132 load_dr2(dbregs->dr2); 2133 load_dr3(dbregs->dr3); 2134 load_dr4(dbregs->dr4); 2135 load_dr5(dbregs->dr5); 2136 load_dr6(dbregs->dr6); 2137 load_dr7(dbregs->dr7); 2138 } else { 2139 /* 2140 * Don't let an illegal value for dr7 get set. Specifically, 2141 * check for undefined settings. Setting these bit patterns 2142 * result in undefined behaviour and can lead to an unexpected 2143 * TRCTRAP. 2144 */ 2145 for (i = 0, mask1 = 0x3<<16, mask2 = 0x2<<16; i < 8; 2146 i++, mask1 <<= 2, mask2 <<= 2) 2147 if ((dbregs->dr7 & mask1) == mask2) 2148 return (EINVAL); 2149 2150 pcb = td->td_pcb; 2151 2152 /* 2153 * Don't let a process set a breakpoint that is not within the 2154 * process's address space. If a process could do this, it 2155 * could halt the system by setting a breakpoint in the kernel 2156 * (if ddb was enabled). Thus, we need to check to make sure 2157 * that no breakpoints are being enabled for addresses outside 2158 * process's address space, unless, perhaps, we were called by 2159 * uid 0. 2160 * 2161 * XXX - what about when the watched area of the user's 2162 * address space is written into from within the kernel 2163 * ... wouldn't that still cause a breakpoint to be generated 2164 * from within kernel mode? 2165 */ 2166 2167 if (suser_td(td) != 0) { 2168 if (dbregs->dr7 & 0x3) { 2169 /* dr0 is enabled */ 2170 if (dbregs->dr0 >= VM_MAXUSER_ADDRESS) 2171 return (EINVAL); 2172 } 2173 2174 if (dbregs->dr7 & (0x3<<2)) { 2175 /* dr1 is enabled */ 2176 if (dbregs->dr1 >= VM_MAXUSER_ADDRESS) 2177 return (EINVAL); 2178 } 2179 2180 if (dbregs->dr7 & (0x3<<4)) { 2181 /* dr2 is enabled */ 2182 if (dbregs->dr2 >= VM_MAXUSER_ADDRESS) 2183 return (EINVAL); 2184 } 2185 2186 if (dbregs->dr7 & (0x3<<6)) { 2187 /* dr3 is enabled */ 2188 if (dbregs->dr3 >= VM_MAXUSER_ADDRESS) 2189 return (EINVAL); 2190 } 2191 } 2192 2193 pcb->pcb_dr0 = dbregs->dr0; 2194 pcb->pcb_dr1 = dbregs->dr1; 2195 pcb->pcb_dr2 = dbregs->dr2; 2196 pcb->pcb_dr3 = dbregs->dr3; 2197 pcb->pcb_dr6 = dbregs->dr6; 2198 pcb->pcb_dr7 = dbregs->dr7; 2199 2200 pcb->pcb_flags |= PCB_DBREGS; 2201 } 2202 2203 return (0); 2204} 2205 2206/* 2207 * Return > 0 if a hardware breakpoint has been hit, and the 2208 * breakpoint was in user space. Return 0, otherwise. 2209 */ 2210int 2211user_dbreg_trap(void) 2212{ 2213 u_int32_t dr7, dr6; /* debug registers dr6 and dr7 */ 2214 u_int32_t bp; /* breakpoint bits extracted from dr6 */ 2215 int nbp; /* number of breakpoints that triggered */ 2216 caddr_t addr[4]; /* breakpoint addresses */ 2217 int i; 2218 2219 dr7 = rdr7(); 2220 if ((dr7 & 0x000000ff) == 0) { 2221 /* 2222 * all GE and LE bits in the dr7 register are zero, 2223 * thus the trap couldn't have been caused by the 2224 * hardware debug registers 2225 */ 2226 return 0; 2227 } 2228 2229 nbp = 0; 2230 dr6 = rdr6(); 2231 bp = dr6 & 0x0000000f; 2232 2233 if (!bp) { 2234 /* 2235 * None of the breakpoint bits are set meaning this 2236 * trap was not caused by any of the debug registers 2237 */ 2238 return 0; 2239 } 2240 2241 /* 2242 * at least one of the breakpoints were hit, check to see 2243 * which ones and if any of them are user space addresses 2244 */ 2245 2246 if (bp & 0x01) { 2247 addr[nbp++] = (caddr_t)rdr0(); 2248 } 2249 if (bp & 0x02) { 2250 addr[nbp++] = (caddr_t)rdr1(); 2251 } 2252 if (bp & 0x04) { 2253 addr[nbp++] = (caddr_t)rdr2(); 2254 } 2255 if (bp & 0x08) { 2256 addr[nbp++] = (caddr_t)rdr3(); 2257 } 2258 2259 for (i=0; i<nbp; i++) { 2260 if (addr[i] < 2261 (caddr_t)VM_MAXUSER_ADDRESS) { 2262 /* 2263 * addr[i] is in user space 2264 */ 2265 return nbp; 2266 } 2267 } 2268 2269 /* 2270 * None of the breakpoints are in user space. 2271 */ 2272 return 0; 2273} 2274 2275 2276#ifndef DDB 2277void 2278Debugger(const char *msg) 2279{ 2280 printf("Debugger(\"%s\") called.\n", msg); 2281} 2282#endif /* no DDB */ 2283 2284#include <sys/disklabel.h> 2285 2286/* 2287 * Determine the size of the transfer, and make sure it is 2288 * within the boundaries of the partition. Adjust transfer 2289 * if needed, and signal errors or early completion. 2290 */ 2291int 2292bounds_check_with_label(struct bio *bp, struct disklabel *lp, int wlabel) 2293{ 2294 struct partition *p = lp->d_partitions + dkpart(bp->bio_dev); 2295 int labelsect = lp->d_partitions[0].p_offset; 2296 int maxsz = p->p_size, 2297 sz = (bp->bio_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT; 2298 2299 /* overwriting disk label ? */ 2300 /* XXX should also protect bootstrap in first 8K */ 2301 if (bp->bio_blkno + p->p_offset <= LABELSECTOR + labelsect && 2302#if LABELSECTOR != 0 2303 bp->bio_blkno + p->p_offset + sz > LABELSECTOR + labelsect && 2304#endif 2305 (bp->bio_cmd == BIO_WRITE) && wlabel == 0) { 2306 bp->bio_error = EROFS; 2307 goto bad; 2308 } 2309 2310#if defined(DOSBBSECTOR) && defined(notyet) 2311 /* overwriting master boot record? */ 2312 if (bp->bio_blkno + p->p_offset <= DOSBBSECTOR && 2313 (bp->bio_cmd == BIO_WRITE) && wlabel == 0) { 2314 bp->bio_error = EROFS; 2315 goto bad; 2316 } 2317#endif 2318 2319 /* beyond partition? */ 2320 if (bp->bio_blkno < 0 || bp->bio_blkno + sz > maxsz) { 2321 /* if exactly at end of disk, return an EOF */ 2322 if (bp->bio_blkno == maxsz) { 2323 bp->bio_resid = bp->bio_bcount; 2324 return(0); 2325 } 2326 /* or truncate if part of it fits */ 2327 sz = maxsz - bp->bio_blkno; 2328 if (sz <= 0) { 2329 bp->bio_error = EINVAL; 2330 goto bad; 2331 } 2332 bp->bio_bcount = sz << DEV_BSHIFT; 2333 } 2334 2335 bp->bio_pblkno = bp->bio_blkno + p->p_offset; 2336 return(1); 2337 2338bad: 2339 bp->bio_flags |= BIO_ERROR; 2340 return(-1); 2341} 2342 2343#ifdef DDB 2344 2345/* 2346 * Provide inb() and outb() as functions. They are normally only 2347 * available as macros calling inlined functions, thus cannot be 2348 * called inside DDB. 2349 * 2350 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined. 2351 */ 2352 2353#undef inb 2354#undef outb 2355 2356/* silence compiler warnings */ 2357u_char inb(u_int); 2358void outb(u_int, u_char); 2359 2360u_char 2361inb(u_int port) 2362{ 2363 u_char data; 2364 /* 2365 * We use %%dx and not %1 here because i/o is done at %dx and not at 2366 * %edx, while gcc generates inferior code (movw instead of movl) 2367 * if we tell it to load (u_short) port. 2368 */ 2369 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 2370 return (data); 2371} 2372 2373void 2374outb(u_int port, u_char data) 2375{ 2376 u_char al; 2377 /* 2378 * Use an unnecessary assignment to help gcc's register allocator. 2379 * This make a large difference for gcc-1.40 and a tiny difference 2380 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for 2381 * best results. gcc-2.6.0 can't handle this. 2382 */ 2383 al = data; 2384 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 2385} 2386 2387#endif /* DDB */ 2388