machdep.c revision 89195
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 89195 2002-01-10 11:49:55Z 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 */ 590#ifdef COMPAT_43 591int 592osigreturn(td, uap) 593 struct thread *td; 594 struct osigreturn_args /* { 595 struct osigcontext *sigcntxp; 596 } */ *uap; 597{ 598 struct trapframe *regs; 599 struct osigcontext *scp; 600 struct proc *p = td->td_proc; 601 int eflags; 602 603 regs = td->td_frame; 604 scp = uap->sigcntxp; 605 if (!useracc((caddr_t)scp, sizeof(*scp), VM_PROT_READ)) 606 return (EFAULT); 607 eflags = scp->sc_ps; 608 if (eflags & PSL_VM) { 609 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 610 struct vm86_kernel *vm86; 611 612 /* 613 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 614 * set up the vm86 area, and we can't enter vm86 mode. 615 */ 616 if (td->td_pcb->pcb_ext == 0) 617 return (EINVAL); 618 vm86 = &td->td_pcb->pcb_ext->ext_vm86; 619 if (vm86->vm86_inited == 0) 620 return (EINVAL); 621 622 /* Go back to user mode if both flags are set. */ 623 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 624 trapsignal(p, SIGBUS, 0); 625 626 if (vm86->vm86_has_vme) { 627 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 628 (eflags & VME_USERCHANGE) | PSL_VM; 629 } else { 630 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 631 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | 632 (eflags & VM_USERCHANGE) | PSL_VM; 633 } 634 tf->tf_vm86_ds = scp->sc_ds; 635 tf->tf_vm86_es = scp->sc_es; 636 tf->tf_vm86_fs = scp->sc_fs; 637 tf->tf_vm86_gs = scp->sc_gs; 638 tf->tf_ds = _udatasel; 639 tf->tf_es = _udatasel; 640 tf->tf_fs = _udatasel; 641 } else { 642 /* 643 * Don't allow users to change privileged or reserved flags. 644 */ 645 /* 646 * XXX do allow users to change the privileged flag PSL_RF. 647 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 648 * should sometimes set it there too. tf_eflags is kept in 649 * the signal context during signal handling and there is no 650 * other place to remember it, so the PSL_RF bit may be 651 * corrupted by the signal handler without us knowing. 652 * Corruption of the PSL_RF bit at worst causes one more or 653 * one less debugger trap, so allowing it is fairly harmless. 654 */ 655 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 656 return (EINVAL); 657 } 658 659 /* 660 * Don't allow users to load a valid privileged %cs. Let the 661 * hardware check for invalid selectors, excess privilege in 662 * other selectors, invalid %eip's and invalid %esp's. 663 */ 664 if (!CS_SECURE(scp->sc_cs)) { 665 trapsignal(p, SIGBUS, T_PROTFLT); 666 return (EINVAL); 667 } 668 regs->tf_ds = scp->sc_ds; 669 regs->tf_es = scp->sc_es; 670 regs->tf_fs = scp->sc_fs; 671 } 672 673 /* Restore remaining registers. */ 674 regs->tf_eax = scp->sc_eax; 675 regs->tf_ebx = scp->sc_ebx; 676 regs->tf_ecx = scp->sc_ecx; 677 regs->tf_edx = scp->sc_edx; 678 regs->tf_esi = scp->sc_esi; 679 regs->tf_edi = scp->sc_edi; 680 regs->tf_cs = scp->sc_cs; 681 regs->tf_ss = scp->sc_ss; 682 regs->tf_isp = scp->sc_isp; 683 684 PROC_LOCK(p); 685#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 686 if (scp->sc_onstack & 1) 687 p->p_sigstk.ss_flags |= SS_ONSTACK; 688 else 689 p->p_sigstk.ss_flags &= ~SS_ONSTACK; 690#endif 691 692 SIGSETOLD(p->p_sigmask, scp->sc_mask); 693 SIG_CANTMASK(p->p_sigmask); 694 PROC_UNLOCK(p); 695 regs->tf_ebp = scp->sc_fp; 696 regs->tf_esp = scp->sc_sp; 697 regs->tf_eip = scp->sc_pc; 698 regs->tf_eflags = eflags; 699 return (EJUSTRETURN); 700} 701#endif 702 703int 704sigreturn(td, uap) 705 struct thread *td; 706 struct sigreturn_args /* { 707 ucontext_t *sigcntxp; 708 } */ *uap; 709{ 710 struct proc *p = td->td_proc; 711 struct trapframe *regs; 712 ucontext_t *ucp; 713 int cs, eflags; 714 715 ucp = uap->sigcntxp; 716#ifdef COMPAT_43 717 if (!useracc((caddr_t)ucp, sizeof(struct osigcontext), VM_PROT_READ)) 718 return (EFAULT); 719 if (((struct osigcontext *)ucp)->sc_trapno == 0x01d516) 720 return (osigreturn(td, (struct osigreturn_args *)uap)); 721 /* 722 * Since ucp is not an osigcontext but a ucontext_t, we have to 723 * check again if all of it is accessible. A ucontext_t is 724 * much larger, so instead of just checking for the pointer 725 * being valid for the size of an osigcontext, now check for 726 * it being valid for a whole, new-style ucontext_t. 727 */ 728#endif 729 if (!useracc((caddr_t)ucp, sizeof(*ucp), VM_PROT_READ)) 730 return (EFAULT); 731 732 regs = td->td_frame; 733 eflags = ucp->uc_mcontext.mc_eflags; 734 if (eflags & PSL_VM) { 735 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 736 struct vm86_kernel *vm86; 737 738 /* 739 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 740 * set up the vm86 area, and we can't enter vm86 mode. 741 */ 742 if (td->td_pcb->pcb_ext == 0) 743 return (EINVAL); 744 vm86 = &td->td_pcb->pcb_ext->ext_vm86; 745 if (vm86->vm86_inited == 0) 746 return (EINVAL); 747 748 /* Go back to user mode if both flags are set. */ 749 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 750 trapsignal(p, SIGBUS, 0); 751 752 if (vm86->vm86_has_vme) { 753 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 754 (eflags & VME_USERCHANGE) | PSL_VM; 755 } else { 756 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 757 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | 758 (eflags & VM_USERCHANGE) | PSL_VM; 759 } 760 bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe)); 761 tf->tf_eflags = eflags; 762 tf->tf_vm86_ds = tf->tf_ds; 763 tf->tf_vm86_es = tf->tf_es; 764 tf->tf_vm86_fs = tf->tf_fs; 765 tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs; 766 tf->tf_ds = _udatasel; 767 tf->tf_es = _udatasel; 768 tf->tf_fs = _udatasel; 769 } else { 770 /* 771 * Don't allow users to change privileged or reserved flags. 772 */ 773 /* 774 * XXX do allow users to change the privileged flag PSL_RF. 775 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 776 * should sometimes set it there too. tf_eflags is kept in 777 * the signal context during signal handling and there is no 778 * other place to remember it, so the PSL_RF bit may be 779 * corrupted by the signal handler without us knowing. 780 * Corruption of the PSL_RF bit at worst causes one more or 781 * one less debugger trap, so allowing it is fairly harmless. 782 */ 783 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 784 printf("sigreturn: eflags = 0x%x\n", eflags); 785 return (EINVAL); 786 } 787 788 /* 789 * Don't allow users to load a valid privileged %cs. Let the 790 * hardware check for invalid selectors, excess privilege in 791 * other selectors, invalid %eip's and invalid %esp's. 792 */ 793 cs = ucp->uc_mcontext.mc_cs; 794 if (!CS_SECURE(cs)) { 795 printf("sigreturn: cs = 0x%x\n", cs); 796 trapsignal(p, SIGBUS, T_PROTFLT); 797 return (EINVAL); 798 } 799 800 bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(*regs)); 801 } 802 803 PROC_LOCK(p); 804#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 805 if (ucp->uc_mcontext.mc_onstack & 1) 806 p->p_sigstk.ss_flags |= SS_ONSTACK; 807 else 808 p->p_sigstk.ss_flags &= ~SS_ONSTACK; 809#endif 810 811 p->p_sigmask = ucp->uc_sigmask; 812 SIG_CANTMASK(p->p_sigmask); 813 PROC_UNLOCK(p); 814 return (EJUSTRETURN); 815} 816 817/* 818 * Machine dependent boot() routine 819 * 820 * I haven't seen anything to put here yet 821 * Possibly some stuff might be grafted back here from boot() 822 */ 823void 824cpu_boot(int howto) 825{ 826} 827 828/* 829 * Shutdown the CPU as much as possible 830 */ 831void 832cpu_halt(void) 833{ 834 for (;;) 835 __asm__ ("hlt"); 836} 837 838/* 839 * Hook to idle the CPU when possible. This currently only works in 840 * the !SMP case, as there is no clean way to ensure that a CPU will be 841 * woken when there is work available for it. 842 */ 843static int cpu_idle_hlt = 1; 844SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW, 845 &cpu_idle_hlt, 0, "Idle loop HLT enable"); 846 847/* 848 * Note that we have to be careful here to avoid a race between checking 849 * procrunnable() and actually halting. If we don't do this, we may waste 850 * the time between calling hlt and the next interrupt even though there 851 * is a runnable process. 852 */ 853void 854cpu_idle(void) 855{ 856#ifndef SMP 857 if (cpu_idle_hlt) { 858 disable_intr(); 859 if (procrunnable()) 860 enable_intr(); 861 else { 862 enable_intr(); 863 __asm __volatile("hlt"); 864 } 865 } 866#endif 867} 868 869/* 870 * Clear registers on exec 871 */ 872void 873setregs(td, entry, stack, ps_strings) 874 struct thread *td; 875 u_long entry; 876 u_long stack; 877 u_long ps_strings; 878{ 879 struct trapframe *regs = td->td_frame; 880 struct pcb *pcb = td->td_pcb; 881 882 if (td->td_proc->p_md.md_ldt) 883 user_ldt_free(td); 884 885 bzero((char *)regs, sizeof(struct trapframe)); 886 regs->tf_eip = entry; 887 regs->tf_esp = stack; 888 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T); 889 regs->tf_ss = _udatasel; 890 regs->tf_ds = _udatasel; 891 regs->tf_es = _udatasel; 892 regs->tf_fs = _udatasel; 893 regs->tf_cs = _ucodesel; 894 895 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */ 896 regs->tf_ebx = ps_strings; 897 898 /* reset %gs as well */ 899 if (pcb == PCPU_GET(curpcb)) 900 load_gs(_udatasel); 901 else 902 pcb->pcb_gs = _udatasel; 903 904 /* 905 * Reset the hardware debug registers if they were in use. 906 * They won't have any meaning for the newly exec'd process. 907 */ 908 if (pcb->pcb_flags & PCB_DBREGS) { 909 pcb->pcb_dr0 = 0; 910 pcb->pcb_dr1 = 0; 911 pcb->pcb_dr2 = 0; 912 pcb->pcb_dr3 = 0; 913 pcb->pcb_dr6 = 0; 914 pcb->pcb_dr7 = 0; 915 if (pcb == PCPU_GET(curpcb)) { 916 /* 917 * Clear the debug registers on the running 918 * CPU, otherwise they will end up affecting 919 * the next process we switch to. 920 */ 921 reset_dbregs(); 922 } 923 pcb->pcb_flags &= ~PCB_DBREGS; 924 } 925 926 /* 927 * Initialize the math emulator (if any) for the current process. 928 * Actually, just clear the bit that says that the emulator has 929 * been initialized. Initialization is delayed until the process 930 * traps to the emulator (if it is done at all) mainly because 931 * emulators don't provide an entry point for initialization. 932 */ 933 td->td_pcb->pcb_flags &= ~FP_SOFTFP; 934 935 /* 936 * Arrange to trap the next npx or `fwait' instruction (see npx.c 937 * for why fwait must be trapped at least if there is an npx or an 938 * emulator). This is mainly to handle the case where npx0 is not 939 * configured, since the npx routines normally set up the trap 940 * otherwise. It should be done only at boot time, but doing it 941 * here allows modifying `npx_exists' for testing the emulator on 942 * systems with an npx. 943 */ 944 load_cr0(rcr0() | CR0_MP | CR0_TS); 945 946#ifdef DEV_NPX 947 /* Initialize the npx (if any) for the current process. */ 948 npxinit(__INITIAL_NPXCW__); 949#endif 950 951 /* 952 * XXX - Linux emulator 953 * Make sure sure edx is 0x0 on entry. Linux binaries depend 954 * on it. 955 */ 956 td->td_retval[1] = 0; 957} 958 959void 960cpu_setregs(void) 961{ 962 unsigned int cr0; 963 964 cr0 = rcr0(); 965#ifdef SMP 966 cr0 |= CR0_NE; /* Done by npxinit() */ 967#endif 968 cr0 |= CR0_MP | CR0_TS; /* Done at every execve() too. */ 969#ifndef I386_CPU 970 cr0 |= CR0_WP | CR0_AM; 971#endif 972 load_cr0(cr0); 973 load_gs(_udatasel); 974} 975 976static int 977sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS) 978{ 979 int error; 980 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 981 req); 982 if (!error && req->newptr) 983 resettodr(); 984 return (error); 985} 986 987SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 988 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 989 990SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, 991 CTLFLAG_RW, &disable_rtc_set, 0, ""); 992 993SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo, 994 CTLFLAG_RD, &bootinfo, bootinfo, ""); 995 996SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock, 997 CTLFLAG_RW, &wall_cmos_clock, 0, ""); 998 999/* 1000 * Initialize 386 and configure to run kernel 1001 */ 1002 1003/* 1004 * Initialize segments & interrupt table 1005 */ 1006 1007int _default_ldt; 1008union descriptor gdt[NGDT * MAXCPU]; /* global descriptor table */ 1009static struct gate_descriptor idt0[NIDT]; 1010struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */ 1011union descriptor ldt[NLDT]; /* local descriptor table */ 1012#ifdef SMP 1013/* table descriptors - used to load tables by microp */ 1014struct region_descriptor r_gdt, r_idt; 1015#endif 1016 1017int private_tss; /* flag indicating private tss */ 1018 1019#if defined(I586_CPU) && !defined(NO_F00F_HACK) 1020extern int has_f00f_bug; 1021#endif 1022 1023static struct i386tss dblfault_tss; 1024static char dblfault_stack[PAGE_SIZE]; 1025 1026extern struct user *proc0uarea; 1027extern vm_offset_t proc0kstack; 1028 1029 1030/* software prototypes -- in more palatable form */ 1031struct soft_segment_descriptor gdt_segs[] = { 1032/* GNULL_SEL 0 Null Descriptor */ 1033{ 0x0, /* segment base address */ 1034 0x0, /* length */ 1035 0, /* segment type */ 1036 0, /* segment descriptor priority level */ 1037 0, /* segment descriptor present */ 1038 0, 0, 1039 0, /* default 32 vs 16 bit size */ 1040 0 /* limit granularity (byte/page units)*/ }, 1041/* GCODE_SEL 1 Code Descriptor for kernel */ 1042{ 0x0, /* segment base address */ 1043 0xfffff, /* length - all address space */ 1044 SDT_MEMERA, /* segment type */ 1045 0, /* segment descriptor priority level */ 1046 1, /* segment descriptor present */ 1047 0, 0, 1048 1, /* default 32 vs 16 bit size */ 1049 1 /* limit granularity (byte/page units)*/ }, 1050/* GDATA_SEL 2 Data Descriptor for kernel */ 1051{ 0x0, /* segment base address */ 1052 0xfffff, /* length - all address space */ 1053 SDT_MEMRWA, /* segment type */ 1054 0, /* segment descriptor priority level */ 1055 1, /* segment descriptor present */ 1056 0, 0, 1057 1, /* default 32 vs 16 bit size */ 1058 1 /* limit granularity (byte/page units)*/ }, 1059/* GPRIV_SEL 3 SMP Per-Processor Private Data Descriptor */ 1060{ 0x0, /* segment base address */ 1061 0xfffff, /* length - all address space */ 1062 SDT_MEMRWA, /* segment type */ 1063 0, /* segment descriptor priority level */ 1064 1, /* segment descriptor present */ 1065 0, 0, 1066 1, /* default 32 vs 16 bit size */ 1067 1 /* limit granularity (byte/page units)*/ }, 1068/* GPROC0_SEL 4 Proc 0 Tss Descriptor */ 1069{ 1070 0x0, /* segment base address */ 1071 sizeof(struct i386tss)-1,/* length - all address space */ 1072 SDT_SYS386TSS, /* segment type */ 1073 0, /* segment descriptor priority level */ 1074 1, /* segment descriptor present */ 1075 0, 0, 1076 0, /* unused - default 32 vs 16 bit size */ 1077 0 /* limit granularity (byte/page units)*/ }, 1078/* GLDT_SEL 5 LDT Descriptor */ 1079{ (int) ldt, /* segment base address */ 1080 sizeof(ldt)-1, /* length - all address space */ 1081 SDT_SYSLDT, /* segment type */ 1082 SEL_UPL, /* segment descriptor priority level */ 1083 1, /* segment descriptor present */ 1084 0, 0, 1085 0, /* unused - default 32 vs 16 bit size */ 1086 0 /* limit granularity (byte/page units)*/ }, 1087/* GUSERLDT_SEL 6 User LDT Descriptor per process */ 1088{ (int) ldt, /* segment base address */ 1089 (512 * sizeof(union descriptor)-1), /* length */ 1090 SDT_SYSLDT, /* segment type */ 1091 0, /* segment descriptor priority level */ 1092 1, /* segment descriptor present */ 1093 0, 0, 1094 0, /* unused - default 32 vs 16 bit size */ 1095 0 /* limit granularity (byte/page units)*/ }, 1096/* GTGATE_SEL 7 Null Descriptor - Placeholder */ 1097{ 0x0, /* segment base address */ 1098 0x0, /* length - all address space */ 1099 0, /* segment type */ 1100 0, /* segment descriptor priority level */ 1101 0, /* segment descriptor present */ 1102 0, 0, 1103 0, /* default 32 vs 16 bit size */ 1104 0 /* limit granularity (byte/page units)*/ }, 1105/* GBIOSLOWMEM_SEL 8 BIOS access to realmode segment 0x40, must be #8 in GDT */ 1106{ 0x400, /* segment base address */ 1107 0xfffff, /* length */ 1108 SDT_MEMRWA, /* segment type */ 1109 0, /* segment descriptor priority level */ 1110 1, /* segment descriptor present */ 1111 0, 0, 1112 1, /* default 32 vs 16 bit size */ 1113 1 /* limit granularity (byte/page units)*/ }, 1114/* GPANIC_SEL 9 Panic Tss Descriptor */ 1115{ (int) &dblfault_tss, /* segment base address */ 1116 sizeof(struct i386tss)-1,/* length - all address space */ 1117 SDT_SYS386TSS, /* segment type */ 1118 0, /* segment descriptor priority level */ 1119 1, /* segment descriptor present */ 1120 0, 0, 1121 0, /* unused - default 32 vs 16 bit size */ 1122 0 /* limit granularity (byte/page units)*/ }, 1123/* GBIOSCODE32_SEL 10 BIOS 32-bit interface (32bit Code) */ 1124{ 0, /* segment base address (overwritten) */ 1125 0xfffff, /* length */ 1126 SDT_MEMERA, /* segment type */ 1127 0, /* segment descriptor priority level */ 1128 1, /* segment descriptor present */ 1129 0, 0, 1130 0, /* default 32 vs 16 bit size */ 1131 1 /* limit granularity (byte/page units)*/ }, 1132/* GBIOSCODE16_SEL 11 BIOS 32-bit interface (16bit Code) */ 1133{ 0, /* segment base address (overwritten) */ 1134 0xfffff, /* length */ 1135 SDT_MEMERA, /* segment type */ 1136 0, /* segment descriptor priority level */ 1137 1, /* segment descriptor present */ 1138 0, 0, 1139 0, /* default 32 vs 16 bit size */ 1140 1 /* limit granularity (byte/page units)*/ }, 1141/* GBIOSDATA_SEL 12 BIOS 32-bit interface (Data) */ 1142{ 0, /* segment base address (overwritten) */ 1143 0xfffff, /* length */ 1144 SDT_MEMRWA, /* segment type */ 1145 0, /* segment descriptor priority level */ 1146 1, /* segment descriptor present */ 1147 0, 0, 1148 1, /* default 32 vs 16 bit size */ 1149 1 /* limit granularity (byte/page units)*/ }, 1150/* GBIOSUTIL_SEL 13 BIOS 16-bit interface (Utility) */ 1151{ 0, /* segment base address (overwritten) */ 1152 0xfffff, /* length */ 1153 SDT_MEMRWA, /* segment type */ 1154 0, /* segment descriptor priority level */ 1155 1, /* segment descriptor present */ 1156 0, 0, 1157 0, /* default 32 vs 16 bit size */ 1158 1 /* limit granularity (byte/page units)*/ }, 1159/* GBIOSARGS_SEL 14 BIOS 16-bit interface (Arguments) */ 1160{ 0, /* segment base address (overwritten) */ 1161 0xfffff, /* length */ 1162 SDT_MEMRWA, /* segment type */ 1163 0, /* segment descriptor priority level */ 1164 1, /* segment descriptor present */ 1165 0, 0, 1166 0, /* default 32 vs 16 bit size */ 1167 1 /* limit granularity (byte/page units)*/ }, 1168}; 1169 1170static struct soft_segment_descriptor ldt_segs[] = { 1171 /* Null Descriptor - overwritten by call gate */ 1172{ 0x0, /* segment base address */ 1173 0x0, /* length - all address space */ 1174 0, /* segment type */ 1175 0, /* segment descriptor priority level */ 1176 0, /* segment descriptor present */ 1177 0, 0, 1178 0, /* default 32 vs 16 bit size */ 1179 0 /* limit granularity (byte/page units)*/ }, 1180 /* Null Descriptor - overwritten by call gate */ 1181{ 0x0, /* segment base address */ 1182 0x0, /* length - all address space */ 1183 0, /* segment type */ 1184 0, /* segment descriptor priority level */ 1185 0, /* segment descriptor present */ 1186 0, 0, 1187 0, /* default 32 vs 16 bit size */ 1188 0 /* limit granularity (byte/page units)*/ }, 1189 /* Null Descriptor - overwritten by call gate */ 1190{ 0x0, /* segment base address */ 1191 0x0, /* length - all address space */ 1192 0, /* segment type */ 1193 0, /* segment descriptor priority level */ 1194 0, /* segment descriptor present */ 1195 0, 0, 1196 0, /* default 32 vs 16 bit size */ 1197 0 /* limit granularity (byte/page units)*/ }, 1198 /* Code Descriptor for user */ 1199{ 0x0, /* segment base address */ 1200 0xfffff, /* length - all address space */ 1201 SDT_MEMERA, /* segment type */ 1202 SEL_UPL, /* segment descriptor priority level */ 1203 1, /* segment descriptor present */ 1204 0, 0, 1205 1, /* default 32 vs 16 bit size */ 1206 1 /* limit granularity (byte/page units)*/ }, 1207 /* Null Descriptor - overwritten by call gate */ 1208{ 0x0, /* segment base address */ 1209 0x0, /* length - all address space */ 1210 0, /* segment type */ 1211 0, /* segment descriptor priority level */ 1212 0, /* segment descriptor present */ 1213 0, 0, 1214 0, /* default 32 vs 16 bit size */ 1215 0 /* limit granularity (byte/page units)*/ }, 1216 /* Data Descriptor for user */ 1217{ 0x0, /* segment base address */ 1218 0xfffff, /* length - all address space */ 1219 SDT_MEMRWA, /* segment type */ 1220 SEL_UPL, /* segment descriptor priority level */ 1221 1, /* segment descriptor present */ 1222 0, 0, 1223 1, /* default 32 vs 16 bit size */ 1224 1 /* limit granularity (byte/page units)*/ }, 1225}; 1226 1227void 1228setidt(idx, func, typ, dpl, selec) 1229 int idx; 1230 inthand_t *func; 1231 int typ; 1232 int dpl; 1233 int selec; 1234{ 1235 struct gate_descriptor *ip; 1236 1237 ip = idt + idx; 1238 ip->gd_looffset = (int)func; 1239 ip->gd_selector = selec; 1240 ip->gd_stkcpy = 0; 1241 ip->gd_xx = 0; 1242 ip->gd_type = typ; 1243 ip->gd_dpl = dpl; 1244 ip->gd_p = 1; 1245 ip->gd_hioffset = ((int)func)>>16 ; 1246} 1247 1248#define IDTVEC(name) __CONCAT(X,name) 1249 1250extern inthand_t 1251 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 1252 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 1253 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 1254 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 1255 IDTVEC(xmm), IDTVEC(lcall_syscall), IDTVEC(int0x80_syscall); 1256 1257void 1258sdtossd(sd, ssd) 1259 struct segment_descriptor *sd; 1260 struct soft_segment_descriptor *ssd; 1261{ 1262 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 1263 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 1264 ssd->ssd_type = sd->sd_type; 1265 ssd->ssd_dpl = sd->sd_dpl; 1266 ssd->ssd_p = sd->sd_p; 1267 ssd->ssd_def32 = sd->sd_def32; 1268 ssd->ssd_gran = sd->sd_gran; 1269} 1270 1271#define PHYSMAP_SIZE (2 * 8) 1272 1273/* 1274 * Populate the (physmap) array with base/bound pairs describing the 1275 * available physical memory in the system, then test this memory and 1276 * build the phys_avail array describing the actually-available memory. 1277 * 1278 * If we cannot accurately determine the physical memory map, then use 1279 * value from the 0xE801 call, and failing that, the RTC. 1280 * 1281 * Total memory size may be set by the kernel environment variable 1282 * hw.physmem or the compile-time define MAXMEM. 1283 */ 1284static void 1285getmemsize(int first) 1286{ 1287 int i, physmap_idx, pa_indx; 1288 u_int basemem, extmem; 1289 struct vm86frame vmf; 1290 struct vm86context vmc; 1291 vm_offset_t pa, physmap[PHYSMAP_SIZE]; 1292 pt_entry_t *pte; 1293 const char *cp; 1294 struct bios_smap *smap; 1295 1296 bzero(&vmf, sizeof(struct vm86frame)); 1297 bzero(physmap, sizeof(physmap)); 1298 1299 /* 1300 * Perform "base memory" related probes & setup 1301 */ 1302 vm86_intcall(0x12, &vmf); 1303 basemem = vmf.vmf_ax; 1304 if (basemem > 640) { 1305 printf("Preposterous BIOS basemem of %uK, truncating to 640K\n", 1306 basemem); 1307 basemem = 640; 1308 } 1309 1310 /* 1311 * XXX if biosbasemem is now < 640, there is a `hole' 1312 * between the end of base memory and the start of 1313 * ISA memory. The hole may be empty or it may 1314 * contain BIOS code or data. Map it read/write so 1315 * that the BIOS can write to it. (Memory from 0 to 1316 * the physical end of the kernel is mapped read-only 1317 * to begin with and then parts of it are remapped. 1318 * The parts that aren't remapped form holes that 1319 * remain read-only and are unused by the kernel. 1320 * The base memory area is below the physical end of 1321 * the kernel and right now forms a read-only hole. 1322 * The part of it from PAGE_SIZE to 1323 * (trunc_page(biosbasemem * 1024) - 1) will be 1324 * remapped and used by the kernel later.) 1325 * 1326 * This code is similar to the code used in 1327 * pmap_mapdev, but since no memory needs to be 1328 * allocated we simply change the mapping. 1329 */ 1330 for (pa = trunc_page(basemem * 1024); 1331 pa < ISA_HOLE_START; pa += PAGE_SIZE) { 1332 pte = vtopte(pa + KERNBASE); 1333 *pte = pa | PG_RW | PG_V; 1334 } 1335 1336 /* 1337 * if basemem != 640, map pages r/w into vm86 page table so 1338 * that the bios can scribble on it. 1339 */ 1340 pte = (pt_entry_t *)vm86paddr; 1341 for (i = basemem / 4; i < 160; i++) 1342 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U; 1343 1344 /* 1345 * map page 1 R/W into the kernel page table so we can use it 1346 * as a buffer. The kernel will unmap this page later. 1347 */ 1348 pte = vtopte(KERNBASE + (1 << PAGE_SHIFT)); 1349 *pte = (1 << PAGE_SHIFT) | PG_RW | PG_V; 1350 1351 /* 1352 * get memory map with INT 15:E820 1353 */ 1354 vmc.npages = 0; 1355 smap = (void *)vm86_addpage(&vmc, 1, KERNBASE + (1 << PAGE_SHIFT)); 1356 vm86_getptr(&vmc, (vm_offset_t)smap, &vmf.vmf_es, &vmf.vmf_di); 1357 1358 physmap_idx = 0; 1359 vmf.vmf_ebx = 0; 1360 do { 1361 vmf.vmf_eax = 0xE820; 1362 vmf.vmf_edx = SMAP_SIG; 1363 vmf.vmf_ecx = sizeof(struct bios_smap); 1364 i = vm86_datacall(0x15, &vmf, &vmc); 1365 if (i || vmf.vmf_eax != SMAP_SIG) 1366 break; 1367 if (boothowto & RB_VERBOSE) 1368 printf("SMAP type=%02x base=%08x %08x len=%08x %08x\n", 1369 smap->type, 1370 *(u_int32_t *)((char *)&smap->base + 4), 1371 (u_int32_t)smap->base, 1372 *(u_int32_t *)((char *)&smap->length + 4), 1373 (u_int32_t)smap->length); 1374 1375 if (smap->type != 0x01) 1376 goto next_run; 1377 1378 if (smap->length == 0) 1379 goto next_run; 1380 1381 if (smap->base >= 0xffffffff) { 1382 printf("%uK of memory above 4GB ignored\n", 1383 (u_int)(smap->length / 1024)); 1384 goto next_run; 1385 } 1386 1387 for (i = 0; i <= physmap_idx; i += 2) { 1388 if (smap->base < physmap[i + 1]) { 1389 if (boothowto & RB_VERBOSE) 1390 printf( 1391 "Overlapping or non-montonic memory region, ignoring second region\n"); 1392 goto next_run; 1393 } 1394 } 1395 1396 if (smap->base == physmap[physmap_idx + 1]) { 1397 physmap[physmap_idx + 1] += smap->length; 1398 goto next_run; 1399 } 1400 1401 physmap_idx += 2; 1402 if (physmap_idx == PHYSMAP_SIZE) { 1403 printf( 1404 "Too many segments in the physical address map, giving up\n"); 1405 break; 1406 } 1407 physmap[physmap_idx] = smap->base; 1408 physmap[physmap_idx + 1] = smap->base + smap->length; 1409next_run: 1410 } while (vmf.vmf_ebx != 0); 1411 1412 if (physmap[1] != 0) 1413 goto physmap_done; 1414 1415 /* 1416 * If we failed above, try memory map with INT 15:E801 1417 */ 1418 vmf.vmf_ax = 0xE801; 1419 if (vm86_intcall(0x15, &vmf) == 0) { 1420 extmem = vmf.vmf_cx + vmf.vmf_dx * 64; 1421 } else { 1422#if 0 1423 vmf.vmf_ah = 0x88; 1424 vm86_intcall(0x15, &vmf); 1425 extmem = vmf.vmf_ax; 1426#else 1427 /* 1428 * Prefer the RTC value for extended memory. 1429 */ 1430 extmem = rtcin(RTC_EXTLO) + (rtcin(RTC_EXTHI) << 8); 1431#endif 1432 } 1433 1434 /* 1435 * Special hack for chipsets that still remap the 384k hole when 1436 * there's 16MB of memory - this really confuses people that 1437 * are trying to use bus mastering ISA controllers with the 1438 * "16MB limit"; they only have 16MB, but the remapping puts 1439 * them beyond the limit. 1440 * 1441 * If extended memory is between 15-16MB (16-17MB phys address range), 1442 * chop it to 15MB. 1443 */ 1444 if ((extmem > 15 * 1024) && (extmem < 16 * 1024)) 1445 extmem = 15 * 1024; 1446 1447 physmap[0] = 0; 1448 physmap[1] = basemem * 1024; 1449 physmap_idx = 2; 1450 physmap[physmap_idx] = 0x100000; 1451 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024; 1452 1453physmap_done: 1454 /* 1455 * Now, physmap contains a map of physical memory. 1456 */ 1457 1458#ifdef SMP 1459 /* make hole for AP bootstrap code */ 1460 physmap[1] = mp_bootaddress(physmap[1] / 1024); 1461 1462 /* look for the MP hardware - needed for apic addresses */ 1463 i386_mp_probe(); 1464#endif 1465 1466 /* 1467 * Maxmem isn't the "maximum memory", it's one larger than the 1468 * highest page of the physical address space. It should be 1469 * called something like "Maxphyspage". We may adjust this 1470 * based on ``hw.physmem'' and the results of the memory test. 1471 */ 1472 Maxmem = atop(physmap[physmap_idx + 1]); 1473 1474#ifdef MAXMEM 1475 Maxmem = MAXMEM / 4; 1476#endif 1477 1478 /* 1479 * hw.physmem is a size in bytes; we also allow k, m, and g suffixes 1480 * for the appropriate modifiers. This overrides MAXMEM. 1481 */ 1482 if ((cp = getenv("hw.physmem")) != NULL) { 1483 u_int64_t AllowMem, sanity; 1484 char *ep; 1485 1486 sanity = AllowMem = strtouq(cp, &ep, 0); 1487 if ((ep != cp) && (*ep != 0)) { 1488 switch(*ep) { 1489 case 'g': 1490 case 'G': 1491 AllowMem <<= 10; 1492 case 'm': 1493 case 'M': 1494 AllowMem <<= 10; 1495 case 'k': 1496 case 'K': 1497 AllowMem <<= 10; 1498 break; 1499 default: 1500 AllowMem = sanity = 0; 1501 } 1502 if (AllowMem < sanity) 1503 AllowMem = 0; 1504 } 1505 if (AllowMem == 0) 1506 printf("Ignoring invalid memory size of '%s'\n", cp); 1507 else 1508 Maxmem = atop(AllowMem); 1509 } 1510 1511 if (atop(physmap[physmap_idx + 1]) != Maxmem && 1512 (boothowto & RB_VERBOSE)) 1513 printf("Physical memory use set to %uK\n", Maxmem * 4); 1514 1515 /* 1516 * If Maxmem has been increased beyond what the system has detected, 1517 * extend the last memory segment to the new limit. 1518 */ 1519 if (atop(physmap[physmap_idx + 1]) < Maxmem) 1520 physmap[physmap_idx + 1] = ptoa(Maxmem); 1521 1522 /* call pmap initialization to make new kernel address space */ 1523 pmap_bootstrap(first, 0); 1524 1525 /* 1526 * Size up each available chunk of physical memory. 1527 */ 1528 physmap[0] = PAGE_SIZE; /* mask off page 0 */ 1529 pa_indx = 0; 1530 phys_avail[pa_indx++] = physmap[0]; 1531 phys_avail[pa_indx] = physmap[0]; 1532#if 0 1533 pte = vtopte(KERNBASE); 1534#else 1535 pte = CMAP1; 1536#endif 1537 1538 /* 1539 * physmap is in bytes, so when converting to page boundaries, 1540 * round up the start address and round down the end address. 1541 */ 1542 for (i = 0; i <= physmap_idx; i += 2) { 1543 vm_offset_t end; 1544 1545 end = ptoa(Maxmem); 1546 if (physmap[i + 1] < end) 1547 end = trunc_page(physmap[i + 1]); 1548 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) { 1549 int tmp, page_bad; 1550#if 0 1551 int *ptr = 0; 1552#else 1553 int *ptr = (int *)CADDR1; 1554#endif 1555 1556 /* 1557 * block out kernel memory as not available. 1558 */ 1559 if (pa >= 0x100000 && pa < first) 1560 continue; 1561 1562 page_bad = FALSE; 1563 1564 /* 1565 * map page into kernel: valid, read/write,non-cacheable 1566 */ 1567 *pte = pa | PG_V | PG_RW | PG_N; 1568 invltlb(); 1569 1570 tmp = *(int *)ptr; 1571 /* 1572 * Test for alternating 1's and 0's 1573 */ 1574 *(volatile int *)ptr = 0xaaaaaaaa; 1575 if (*(volatile int *)ptr != 0xaaaaaaaa) { 1576 page_bad = TRUE; 1577 } 1578 /* 1579 * Test for alternating 0's and 1's 1580 */ 1581 *(volatile int *)ptr = 0x55555555; 1582 if (*(volatile int *)ptr != 0x55555555) { 1583 page_bad = TRUE; 1584 } 1585 /* 1586 * Test for all 1's 1587 */ 1588 *(volatile int *)ptr = 0xffffffff; 1589 if (*(volatile int *)ptr != 0xffffffff) { 1590 page_bad = TRUE; 1591 } 1592 /* 1593 * Test for all 0's 1594 */ 1595 *(volatile int *)ptr = 0x0; 1596 if (*(volatile int *)ptr != 0x0) { 1597 page_bad = TRUE; 1598 } 1599 /* 1600 * Restore original value. 1601 */ 1602 *(int *)ptr = tmp; 1603 1604 /* 1605 * Adjust array of valid/good pages. 1606 */ 1607 if (page_bad == TRUE) { 1608 continue; 1609 } 1610 /* 1611 * If this good page is a continuation of the 1612 * previous set of good pages, then just increase 1613 * the end pointer. Otherwise start a new chunk. 1614 * Note that "end" points one higher than end, 1615 * making the range >= start and < end. 1616 * If we're also doing a speculative memory 1617 * test and we at or past the end, bump up Maxmem 1618 * so that we keep going. The first bad page 1619 * will terminate the loop. 1620 */ 1621 if (phys_avail[pa_indx] == pa) { 1622 phys_avail[pa_indx] += PAGE_SIZE; 1623 } else { 1624 pa_indx++; 1625 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 1626 printf( 1627 "Too many holes in the physical address space, giving up\n"); 1628 pa_indx--; 1629 break; 1630 } 1631 phys_avail[pa_indx++] = pa; /* start */ 1632 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */ 1633 } 1634 physmem++; 1635 } 1636 } 1637 *pte = 0; 1638 invltlb(); 1639 1640 /* 1641 * XXX 1642 * The last chunk must contain at least one page plus the message 1643 * buffer to avoid complicating other code (message buffer address 1644 * calculation, etc.). 1645 */ 1646 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 1647 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) { 1648 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 1649 phys_avail[pa_indx--] = 0; 1650 phys_avail[pa_indx--] = 0; 1651 } 1652 1653 Maxmem = atop(phys_avail[pa_indx]); 1654 1655 /* Trim off space for the message buffer. */ 1656 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE); 1657 1658 avail_end = phys_avail[pa_indx]; 1659} 1660 1661void 1662init386(first) 1663 int first; 1664{ 1665 struct gate_descriptor *gdp; 1666 int gsel_tss, metadata_missing, off, x; 1667#ifndef SMP 1668 /* table descriptors - used to load tables by microp */ 1669 struct region_descriptor r_gdt, r_idt; 1670#endif 1671 struct pcpu *pc; 1672 1673 proc_linkup(&proc0); 1674 proc0.p_uarea = proc0uarea; 1675 thread0 = &proc0.p_thread; 1676 thread0->td_kstack = proc0kstack; 1677 thread0->td_pcb = (struct pcb *) 1678 (thread0->td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1; 1679 atdevbase = ISA_HOLE_START + KERNBASE; 1680 1681 metadata_missing = 0; 1682 if (bootinfo.bi_modulep) { 1683 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE; 1684 preload_bootstrap_relocate(KERNBASE); 1685 } else { 1686 metadata_missing = 1; 1687 } 1688 if (envmode == 1) 1689 kern_envp = static_env; 1690 else if (bootinfo.bi_envp) 1691 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE; 1692 1693 /* Init basic tunables, hz etc */ 1694 init_param1(); 1695 1696 /* 1697 * make gdt memory segments, the code segment goes up to end of the 1698 * page with etext in it, the data segment goes to the end of 1699 * the address space 1700 */ 1701 /* 1702 * XXX text protection is temporarily (?) disabled. The limit was 1703 * i386_btop(round_page(etext)) - 1. 1704 */ 1705 gdt_segs[GCODE_SEL].ssd_limit = atop(0 - 1); 1706 gdt_segs[GDATA_SEL].ssd_limit = atop(0 - 1); 1707#ifdef SMP 1708 pc = &SMP_prvspace[0]; 1709 gdt_segs[GPRIV_SEL].ssd_limit = 1710 atop(sizeof(struct privatespace) - 1); 1711#else 1712 pc = &__pcpu; 1713 gdt_segs[GPRIV_SEL].ssd_limit = 1714 atop(sizeof(struct pcpu) - 1); 1715#endif 1716 gdt_segs[GPRIV_SEL].ssd_base = (int) pc; 1717 gdt_segs[GPROC0_SEL].ssd_base = (int) &pc->pc_common_tss; 1718 1719 for (x = 0; x < NGDT; x++) { 1720#ifdef BDE_DEBUGGER 1721 /* avoid overwriting db entries with APM ones */ 1722 if (x >= GAPMCODE32_SEL && x <= GAPMDATA_SEL) 1723 continue; 1724#endif 1725 ssdtosd(&gdt_segs[x], &gdt[x].sd); 1726 } 1727 1728 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1; 1729 r_gdt.rd_base = (int) gdt; 1730 lgdt(&r_gdt); 1731 1732 pcpu_init(pc, 0, sizeof(struct pcpu)); 1733 PCPU_SET(prvspace, pc); 1734 1735 /* setup curproc so that mutexes work */ 1736 PCPU_SET(curthread, thread0); 1737 1738 LIST_INIT(&thread0->td_contested); 1739 1740 /* 1741 * Initialize mutexes. 1742 */ 1743 mtx_init(&Giant, "Giant", MTX_DEF | MTX_RECURSE); 1744 mtx_init(&sched_lock, "sched lock", MTX_SPIN | MTX_RECURSE); 1745 mtx_init(&proc0.p_mtx, "process lock", MTX_DEF); 1746 mtx_init(&clock_lock, "clk", MTX_SPIN | MTX_RECURSE); 1747 mtx_init(&icu_lock, "icu", MTX_SPIN); 1748 mtx_lock(&Giant); 1749 1750 /* make ldt memory segments */ 1751 /* 1752 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it 1753 * should be spelled ...MAX_USER... 1754 */ 1755 ldt_segs[LUCODE_SEL].ssd_limit = atop(VM_MAXUSER_ADDRESS - 1); 1756 ldt_segs[LUDATA_SEL].ssd_limit = atop(VM_MAXUSER_ADDRESS - 1); 1757 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++) 1758 ssdtosd(&ldt_segs[x], &ldt[x].sd); 1759 1760 _default_ldt = GSEL(GLDT_SEL, SEL_KPL); 1761 lldt(_default_ldt); 1762 PCPU_SET(currentldt, _default_ldt); 1763 1764 /* exceptions */ 1765 for (x = 0; x < NIDT; x++) 1766 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, 1767 GSEL(GCODE_SEL, SEL_KPL)); 1768 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, 1769 GSEL(GCODE_SEL, SEL_KPL)); 1770 setidt(1, &IDTVEC(dbg), SDT_SYS386IGT, SEL_KPL, 1771 GSEL(GCODE_SEL, SEL_KPL)); 1772 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, 1773 GSEL(GCODE_SEL, SEL_KPL)); 1774 setidt(3, &IDTVEC(bpt), SDT_SYS386IGT, SEL_UPL, 1775 GSEL(GCODE_SEL, SEL_KPL)); 1776 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, 1777 GSEL(GCODE_SEL, SEL_KPL)); 1778 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, 1779 GSEL(GCODE_SEL, SEL_KPL)); 1780 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, 1781 GSEL(GCODE_SEL, SEL_KPL)); 1782 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL 1783 , GSEL(GCODE_SEL, SEL_KPL)); 1784 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL)); 1785 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, 1786 GSEL(GCODE_SEL, SEL_KPL)); 1787 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, 1788 GSEL(GCODE_SEL, SEL_KPL)); 1789 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, 1790 GSEL(GCODE_SEL, SEL_KPL)); 1791 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, 1792 GSEL(GCODE_SEL, SEL_KPL)); 1793 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, 1794 GSEL(GCODE_SEL, SEL_KPL)); 1795 setidt(14, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL, 1796 GSEL(GCODE_SEL, SEL_KPL)); 1797 setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, 1798 GSEL(GCODE_SEL, SEL_KPL)); 1799 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, 1800 GSEL(GCODE_SEL, SEL_KPL)); 1801 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, 1802 GSEL(GCODE_SEL, SEL_KPL)); 1803 setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, 1804 GSEL(GCODE_SEL, SEL_KPL)); 1805 setidt(19, &IDTVEC(xmm), SDT_SYS386TGT, SEL_KPL, 1806 GSEL(GCODE_SEL, SEL_KPL)); 1807 setidt(0x80, &IDTVEC(int0x80_syscall), SDT_SYS386TGT, SEL_UPL, 1808 GSEL(GCODE_SEL, SEL_KPL)); 1809 1810 r_idt.rd_limit = sizeof(idt0) - 1; 1811 r_idt.rd_base = (int) idt; 1812 lidt(&r_idt); 1813 1814 /* 1815 * Initialize the console before we print anything out. 1816 */ 1817 cninit(); 1818 1819 if (metadata_missing) 1820 printf("WARNING: loader(8) metadata is missing!\n"); 1821 1822#ifdef DEV_ISA 1823 isa_defaultirq(); 1824#endif 1825 1826#ifdef DDB 1827 kdb_init(); 1828 if (boothowto & RB_KDB) 1829 Debugger("Boot flags requested debugger"); 1830#endif 1831 1832 finishidentcpu(); /* Final stage of CPU initialization */ 1833 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, 1834 GSEL(GCODE_SEL, SEL_KPL)); 1835 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, 1836 GSEL(GCODE_SEL, SEL_KPL)); 1837 initializecpu(); /* Initialize CPU registers */ 1838 1839 /* make an initial tss so cpu can get interrupt stack on syscall! */ 1840 /* Note: -16 is so we can grow the trapframe if we came from vm86 */ 1841 PCPU_SET(common_tss.tss_esp0, thread0->td_kstack + 1842 KSTACK_PAGES * PAGE_SIZE - sizeof(struct pcb) - 16); 1843 PCPU_SET(common_tss.tss_ss0, GSEL(GDATA_SEL, SEL_KPL)); 1844 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 1845 private_tss = 0; 1846 PCPU_SET(tss_gdt, &gdt[GPROC0_SEL].sd); 1847 PCPU_SET(common_tssd, *PCPU_GET(tss_gdt)); 1848 PCPU_SET(common_tss.tss_ioopt, (sizeof (struct i386tss)) << 16); 1849 ltr(gsel_tss); 1850 1851 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 = 1852 dblfault_tss.tss_esp2 = (int)&dblfault_stack[sizeof(dblfault_stack)]; 1853 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 = 1854 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL); 1855 dblfault_tss.tss_cr3 = (int)IdlePTD; 1856 dblfault_tss.tss_eip = (int)dblfault_handler; 1857 dblfault_tss.tss_eflags = PSL_KERNEL; 1858 dblfault_tss.tss_ds = dblfault_tss.tss_es = 1859 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL); 1860 dblfault_tss.tss_fs = GSEL(GPRIV_SEL, SEL_KPL); 1861 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL); 1862 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL); 1863 1864 vm86_initialize(); 1865 getmemsize(first); 1866 init_param2(physmem); 1867 1868 /* now running on new page tables, configured,and u/iom is accessible */ 1869 1870 /* Map the message buffer. */ 1871 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE) 1872 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off); 1873 1874 msgbufinit(msgbufp, MSGBUF_SIZE); 1875 1876 /* make a call gate to reenter kernel with */ 1877 gdp = &ldt[LSYS5CALLS_SEL].gd; 1878 1879 x = (int) &IDTVEC(lcall_syscall); 1880 gdp->gd_looffset = x; 1881 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL); 1882 gdp->gd_stkcpy = 1; 1883 gdp->gd_type = SDT_SYS386CGT; 1884 gdp->gd_dpl = SEL_UPL; 1885 gdp->gd_p = 1; 1886 gdp->gd_hioffset = x >> 16; 1887 1888 /* XXX does this work? */ 1889 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL]; 1890 ldt[LSOL26CALLS_SEL] = ldt[LSYS5CALLS_SEL]; 1891 1892 /* transfer to user mode */ 1893 1894 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL); 1895 _udatasel = LSEL(LUDATA_SEL, SEL_UPL); 1896 1897 /* setup proc 0's pcb */ 1898 thread0->td_pcb->pcb_flags = 0; /* XXXKSE */ 1899 thread0->td_pcb->pcb_cr3 = (int)IdlePTD; 1900 thread0->td_pcb->pcb_ext = 0; 1901 thread0->td_frame = &proc0_tf; 1902} 1903 1904void 1905cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size) 1906{ 1907} 1908 1909#if defined(I586_CPU) && !defined(NO_F00F_HACK) 1910static void f00f_hack(void *unused); 1911SYSINIT(f00f_hack, SI_SUB_INTRINSIC, SI_ORDER_FIRST, f00f_hack, NULL); 1912 1913static void 1914f00f_hack(void *unused) { 1915 struct gate_descriptor *new_idt; 1916#ifndef SMP 1917 struct region_descriptor r_idt; 1918#endif 1919 vm_offset_t tmp; 1920 1921 if (!has_f00f_bug) 1922 return; 1923 1924 GIANT_REQUIRED; 1925 1926 printf("Intel Pentium detected, installing workaround for F00F bug\n"); 1927 1928 r_idt.rd_limit = sizeof(idt0) - 1; 1929 1930 tmp = kmem_alloc(kernel_map, PAGE_SIZE * 2); 1931 if (tmp == 0) 1932 panic("kmem_alloc returned 0"); 1933 if (((unsigned int)tmp & (PAGE_SIZE-1)) != 0) 1934 panic("kmem_alloc returned non-page-aligned memory"); 1935 /* Put the first seven entries in the lower page */ 1936 new_idt = (struct gate_descriptor*)(tmp + PAGE_SIZE - (7*8)); 1937 bcopy(idt, new_idt, sizeof(idt0)); 1938 r_idt.rd_base = (int)new_idt; 1939 lidt(&r_idt); 1940 idt = new_idt; 1941 if (vm_map_protect(kernel_map, tmp, tmp + PAGE_SIZE, 1942 VM_PROT_READ, FALSE) != KERN_SUCCESS) 1943 panic("vm_map_protect failed"); 1944 return; 1945} 1946#endif /* defined(I586_CPU) && !NO_F00F_HACK */ 1947 1948int 1949ptrace_set_pc(struct thread *td, unsigned long addr) 1950{ 1951 td->td_frame->tf_eip = addr; 1952 return (0); 1953} 1954 1955int 1956ptrace_single_step(struct thread *td) 1957{ 1958 td->td_frame->tf_eflags |= PSL_T; 1959 return (0); 1960} 1961 1962int 1963fill_regs(struct thread *td, struct reg *regs) 1964{ 1965 struct pcb *pcb; 1966 struct trapframe *tp; 1967 1968 tp = td->td_frame; 1969 regs->r_fs = tp->tf_fs; 1970 regs->r_es = tp->tf_es; 1971 regs->r_ds = tp->tf_ds; 1972 regs->r_edi = tp->tf_edi; 1973 regs->r_esi = tp->tf_esi; 1974 regs->r_ebp = tp->tf_ebp; 1975 regs->r_ebx = tp->tf_ebx; 1976 regs->r_edx = tp->tf_edx; 1977 regs->r_ecx = tp->tf_ecx; 1978 regs->r_eax = tp->tf_eax; 1979 regs->r_eip = tp->tf_eip; 1980 regs->r_cs = tp->tf_cs; 1981 regs->r_eflags = tp->tf_eflags; 1982 regs->r_esp = tp->tf_esp; 1983 regs->r_ss = tp->tf_ss; 1984 pcb = td->td_pcb; 1985 regs->r_gs = pcb->pcb_gs; 1986 return (0); 1987} 1988 1989int 1990set_regs(struct thread *td, struct reg *regs) 1991{ 1992 struct pcb *pcb; 1993 struct trapframe *tp; 1994 1995 tp = td->td_frame; 1996 if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) || 1997 !CS_SECURE(regs->r_cs)) 1998 return (EINVAL); 1999 tp->tf_fs = regs->r_fs; 2000 tp->tf_es = regs->r_es; 2001 tp->tf_ds = regs->r_ds; 2002 tp->tf_edi = regs->r_edi; 2003 tp->tf_esi = regs->r_esi; 2004 tp->tf_ebp = regs->r_ebp; 2005 tp->tf_ebx = regs->r_ebx; 2006 tp->tf_edx = regs->r_edx; 2007 tp->tf_ecx = regs->r_ecx; 2008 tp->tf_eax = regs->r_eax; 2009 tp->tf_eip = regs->r_eip; 2010 tp->tf_cs = regs->r_cs; 2011 tp->tf_eflags = regs->r_eflags; 2012 tp->tf_esp = regs->r_esp; 2013 tp->tf_ss = regs->r_ss; 2014 pcb = td->td_pcb; 2015 pcb->pcb_gs = regs->r_gs; 2016 return (0); 2017} 2018 2019#ifdef CPU_ENABLE_SSE 2020static void 2021fill_fpregs_xmm(sv_xmm, sv_87) 2022 struct savexmm *sv_xmm; 2023 struct save87 *sv_87; 2024{ 2025 register struct env87 *penv_87 = &sv_87->sv_env; 2026 register struct envxmm *penv_xmm = &sv_xmm->sv_env; 2027 int i; 2028 2029 /* FPU control/status */ 2030 penv_87->en_cw = penv_xmm->en_cw; 2031 penv_87->en_sw = penv_xmm->en_sw; 2032 penv_87->en_tw = penv_xmm->en_tw; 2033 penv_87->en_fip = penv_xmm->en_fip; 2034 penv_87->en_fcs = penv_xmm->en_fcs; 2035 penv_87->en_opcode = penv_xmm->en_opcode; 2036 penv_87->en_foo = penv_xmm->en_foo; 2037 penv_87->en_fos = penv_xmm->en_fos; 2038 2039 /* FPU registers */ 2040 for (i = 0; i < 8; ++i) 2041 sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc; 2042 2043 sv_87->sv_ex_sw = sv_xmm->sv_ex_sw; 2044} 2045 2046static void 2047set_fpregs_xmm(sv_87, sv_xmm) 2048 struct save87 *sv_87; 2049 struct savexmm *sv_xmm; 2050{ 2051 register struct env87 *penv_87 = &sv_87->sv_env; 2052 register struct envxmm *penv_xmm = &sv_xmm->sv_env; 2053 int i; 2054 2055 /* FPU control/status */ 2056 penv_xmm->en_cw = penv_87->en_cw; 2057 penv_xmm->en_sw = penv_87->en_sw; 2058 penv_xmm->en_tw = penv_87->en_tw; 2059 penv_xmm->en_fip = penv_87->en_fip; 2060 penv_xmm->en_fcs = penv_87->en_fcs; 2061 penv_xmm->en_opcode = penv_87->en_opcode; 2062 penv_xmm->en_foo = penv_87->en_foo; 2063 penv_xmm->en_fos = penv_87->en_fos; 2064 2065 /* FPU registers */ 2066 for (i = 0; i < 8; ++i) 2067 sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i]; 2068 2069 sv_xmm->sv_ex_sw = sv_87->sv_ex_sw; 2070} 2071#endif /* CPU_ENABLE_SSE */ 2072 2073int 2074fill_fpregs(struct thread *td, struct fpreg *fpregs) 2075{ 2076#ifdef CPU_ENABLE_SSE 2077 if (cpu_fxsr) { 2078 fill_fpregs_xmm(&td->td_pcb->pcb_save.sv_xmm, 2079 (struct save87 *)fpregs); 2080 return (0); 2081 } 2082#endif /* CPU_ENABLE_SSE */ 2083 bcopy(&td->td_pcb->pcb_save.sv_87, fpregs, sizeof *fpregs); 2084 return (0); 2085} 2086 2087int 2088set_fpregs(struct thread *td, struct fpreg *fpregs) 2089{ 2090#ifdef CPU_ENABLE_SSE 2091 if (cpu_fxsr) { 2092 set_fpregs_xmm((struct save87 *)fpregs, 2093 &td->td_pcb->pcb_save.sv_xmm); 2094 return (0); 2095 } 2096#endif /* CPU_ENABLE_SSE */ 2097 bcopy(fpregs, &td->td_pcb->pcb_save.sv_87, sizeof *fpregs); 2098 return (0); 2099} 2100 2101int 2102fill_dbregs(struct thread *td, struct dbreg *dbregs) 2103{ 2104 struct pcb *pcb; 2105 2106 if (td == NULL) { 2107 dbregs->dr0 = rdr0(); 2108 dbregs->dr1 = rdr1(); 2109 dbregs->dr2 = rdr2(); 2110 dbregs->dr3 = rdr3(); 2111 dbregs->dr4 = rdr4(); 2112 dbregs->dr5 = rdr5(); 2113 dbregs->dr6 = rdr6(); 2114 dbregs->dr7 = rdr7(); 2115 } else { 2116 pcb = td->td_pcb; 2117 dbregs->dr0 = pcb->pcb_dr0; 2118 dbregs->dr1 = pcb->pcb_dr1; 2119 dbregs->dr2 = pcb->pcb_dr2; 2120 dbregs->dr3 = pcb->pcb_dr3; 2121 dbregs->dr4 = 0; 2122 dbregs->dr5 = 0; 2123 dbregs->dr6 = pcb->pcb_dr6; 2124 dbregs->dr7 = pcb->pcb_dr7; 2125 } 2126 return (0); 2127} 2128 2129int 2130set_dbregs(struct thread *td, struct dbreg *dbregs) 2131{ 2132 struct pcb *pcb; 2133 int i; 2134 u_int32_t mask1, mask2; 2135 2136 if (td == NULL) { 2137 load_dr0(dbregs->dr0); 2138 load_dr1(dbregs->dr1); 2139 load_dr2(dbregs->dr2); 2140 load_dr3(dbregs->dr3); 2141 load_dr4(dbregs->dr4); 2142 load_dr5(dbregs->dr5); 2143 load_dr6(dbregs->dr6); 2144 load_dr7(dbregs->dr7); 2145 } else { 2146 /* 2147 * Don't let an illegal value for dr7 get set. Specifically, 2148 * check for undefined settings. Setting these bit patterns 2149 * result in undefined behaviour and can lead to an unexpected 2150 * TRCTRAP. 2151 */ 2152 for (i = 0, mask1 = 0x3<<16, mask2 = 0x2<<16; i < 8; 2153 i++, mask1 <<= 2, mask2 <<= 2) 2154 if ((dbregs->dr7 & mask1) == mask2) 2155 return (EINVAL); 2156 2157 pcb = td->td_pcb; 2158 2159 /* 2160 * Don't let a process set a breakpoint that is not within the 2161 * process's address space. If a process could do this, it 2162 * could halt the system by setting a breakpoint in the kernel 2163 * (if ddb was enabled). Thus, we need to check to make sure 2164 * that no breakpoints are being enabled for addresses outside 2165 * process's address space, unless, perhaps, we were called by 2166 * uid 0. 2167 * 2168 * XXX - what about when the watched area of the user's 2169 * address space is written into from within the kernel 2170 * ... wouldn't that still cause a breakpoint to be generated 2171 * from within kernel mode? 2172 */ 2173 2174 if (suser_td(td) != 0) { 2175 if (dbregs->dr7 & 0x3) { 2176 /* dr0 is enabled */ 2177 if (dbregs->dr0 >= VM_MAXUSER_ADDRESS) 2178 return (EINVAL); 2179 } 2180 2181 if (dbregs->dr7 & (0x3<<2)) { 2182 /* dr1 is enabled */ 2183 if (dbregs->dr1 >= VM_MAXUSER_ADDRESS) 2184 return (EINVAL); 2185 } 2186 2187 if (dbregs->dr7 & (0x3<<4)) { 2188 /* dr2 is enabled */ 2189 if (dbregs->dr2 >= VM_MAXUSER_ADDRESS) 2190 return (EINVAL); 2191 } 2192 2193 if (dbregs->dr7 & (0x3<<6)) { 2194 /* dr3 is enabled */ 2195 if (dbregs->dr3 >= VM_MAXUSER_ADDRESS) 2196 return (EINVAL); 2197 } 2198 } 2199 2200 pcb->pcb_dr0 = dbregs->dr0; 2201 pcb->pcb_dr1 = dbregs->dr1; 2202 pcb->pcb_dr2 = dbregs->dr2; 2203 pcb->pcb_dr3 = dbregs->dr3; 2204 pcb->pcb_dr6 = dbregs->dr6; 2205 pcb->pcb_dr7 = dbregs->dr7; 2206 2207 pcb->pcb_flags |= PCB_DBREGS; 2208 } 2209 2210 return (0); 2211} 2212 2213/* 2214 * Return > 0 if a hardware breakpoint has been hit, and the 2215 * breakpoint was in user space. Return 0, otherwise. 2216 */ 2217int 2218user_dbreg_trap(void) 2219{ 2220 u_int32_t dr7, dr6; /* debug registers dr6 and dr7 */ 2221 u_int32_t bp; /* breakpoint bits extracted from dr6 */ 2222 int nbp; /* number of breakpoints that triggered */ 2223 caddr_t addr[4]; /* breakpoint addresses */ 2224 int i; 2225 2226 dr7 = rdr7(); 2227 if ((dr7 & 0x000000ff) == 0) { 2228 /* 2229 * all GE and LE bits in the dr7 register are zero, 2230 * thus the trap couldn't have been caused by the 2231 * hardware debug registers 2232 */ 2233 return 0; 2234 } 2235 2236 nbp = 0; 2237 dr6 = rdr6(); 2238 bp = dr6 & 0x0000000f; 2239 2240 if (!bp) { 2241 /* 2242 * None of the breakpoint bits are set meaning this 2243 * trap was not caused by any of the debug registers 2244 */ 2245 return 0; 2246 } 2247 2248 /* 2249 * at least one of the breakpoints were hit, check to see 2250 * which ones and if any of them are user space addresses 2251 */ 2252 2253 if (bp & 0x01) { 2254 addr[nbp++] = (caddr_t)rdr0(); 2255 } 2256 if (bp & 0x02) { 2257 addr[nbp++] = (caddr_t)rdr1(); 2258 } 2259 if (bp & 0x04) { 2260 addr[nbp++] = (caddr_t)rdr2(); 2261 } 2262 if (bp & 0x08) { 2263 addr[nbp++] = (caddr_t)rdr3(); 2264 } 2265 2266 for (i=0; i<nbp; i++) { 2267 if (addr[i] < 2268 (caddr_t)VM_MAXUSER_ADDRESS) { 2269 /* 2270 * addr[i] is in user space 2271 */ 2272 return nbp; 2273 } 2274 } 2275 2276 /* 2277 * None of the breakpoints are in user space. 2278 */ 2279 return 0; 2280} 2281 2282 2283#ifndef DDB 2284void 2285Debugger(const char *msg) 2286{ 2287 printf("Debugger(\"%s\") called.\n", msg); 2288} 2289#endif /* no DDB */ 2290 2291#include <sys/disklabel.h> 2292 2293/* 2294 * Determine the size of the transfer, and make sure it is 2295 * within the boundaries of the partition. Adjust transfer 2296 * if needed, and signal errors or early completion. 2297 */ 2298int 2299bounds_check_with_label(struct bio *bp, struct disklabel *lp, int wlabel) 2300{ 2301 struct partition *p = lp->d_partitions + dkpart(bp->bio_dev); 2302 int labelsect = lp->d_partitions[0].p_offset; 2303 int maxsz = p->p_size, 2304 sz = (bp->bio_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT; 2305 2306 /* overwriting disk label ? */ 2307 /* XXX should also protect bootstrap in first 8K */ 2308 if (bp->bio_blkno + p->p_offset <= LABELSECTOR + labelsect && 2309#if LABELSECTOR != 0 2310 bp->bio_blkno + p->p_offset + sz > LABELSECTOR + labelsect && 2311#endif 2312 (bp->bio_cmd == BIO_WRITE) && wlabel == 0) { 2313 bp->bio_error = EROFS; 2314 goto bad; 2315 } 2316 2317#if defined(DOSBBSECTOR) && defined(notyet) 2318 /* overwriting master boot record? */ 2319 if (bp->bio_blkno + p->p_offset <= DOSBBSECTOR && 2320 (bp->bio_cmd == BIO_WRITE) && wlabel == 0) { 2321 bp->bio_error = EROFS; 2322 goto bad; 2323 } 2324#endif 2325 2326 /* beyond partition? */ 2327 if (bp->bio_blkno < 0 || bp->bio_blkno + sz > maxsz) { 2328 /* if exactly at end of disk, return an EOF */ 2329 if (bp->bio_blkno == maxsz) { 2330 bp->bio_resid = bp->bio_bcount; 2331 return(0); 2332 } 2333 /* or truncate if part of it fits */ 2334 sz = maxsz - bp->bio_blkno; 2335 if (sz <= 0) { 2336 bp->bio_error = EINVAL; 2337 goto bad; 2338 } 2339 bp->bio_bcount = sz << DEV_BSHIFT; 2340 } 2341 2342 bp->bio_pblkno = bp->bio_blkno + p->p_offset; 2343 return(1); 2344 2345bad: 2346 bp->bio_flags |= BIO_ERROR; 2347 return(-1); 2348} 2349 2350#ifdef DDB 2351 2352/* 2353 * Provide inb() and outb() as functions. They are normally only 2354 * available as macros calling inlined functions, thus cannot be 2355 * called inside DDB. 2356 * 2357 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined. 2358 */ 2359 2360#undef inb 2361#undef outb 2362 2363/* silence compiler warnings */ 2364u_char inb(u_int); 2365void outb(u_int, u_char); 2366 2367u_char 2368inb(u_int port) 2369{ 2370 u_char data; 2371 /* 2372 * We use %%dx and not %1 here because i/o is done at %dx and not at 2373 * %edx, while gcc generates inferior code (movw instead of movl) 2374 * if we tell it to load (u_short) port. 2375 */ 2376 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 2377 return (data); 2378} 2379 2380void 2381outb(u_int port, u_char data) 2382{ 2383 u_char al; 2384 /* 2385 * Use an unnecessary assignment to help gcc's register allocator. 2386 * This make a large difference for gcc-1.40 and a tiny difference 2387 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for 2388 * best results. gcc-2.6.0 can't handle this. 2389 */ 2390 al = data; 2391 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 2392} 2393 2394#endif /* DDB */ 2395