machdep.c revision 90361
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 90361 2002-02-07 20:58:47Z julian $ 39 */ 40 41#include "opt_atalk.h" 42#include "opt_compat.h" 43#include "opt_cpu.h" 44#include "opt_ddb.h" 45#include "opt_inet.h" 46#include "opt_ipx.h" 47#include "opt_isa.h" 48#include "opt_maxmem.h" 49#include "opt_msgbuf.h" 50#include "opt_npx.h" 51#include "opt_perfmon.h" 52#include "opt_kstack_pages.h" 53/* #include "opt_userconfig.h" */ 54 55#include <sys/param.h> 56#include <sys/systm.h> 57#include <sys/sysproto.h> 58#include <sys/signalvar.h> 59#include <sys/kernel.h> 60#include <sys/ktr.h> 61#include <sys/linker.h> 62#include <sys/lock.h> 63#include <sys/malloc.h> 64#include <sys/mutex.h> 65#include <sys/pcpu.h> 66#include <sys/proc.h> 67#include <sys/bio.h> 68#include <sys/buf.h> 69#include <sys/reboot.h> 70#include <sys/smp.h> 71#include <sys/callout.h> 72#include <sys/msgbuf.h> 73#include <sys/sysent.h> 74#include <sys/sysctl.h> 75#include <sys/vmmeter.h> 76#include <sys/bus.h> 77#include <sys/eventhandler.h> 78 79#include <vm/vm.h> 80#include <vm/vm_param.h> 81#include <sys/lock.h> 82#include <vm/vm_kern.h> 83#include <vm/vm_object.h> 84#include <vm/vm_page.h> 85#include <vm/vm_map.h> 86#include <vm/vm_pager.h> 87#include <vm/vm_extern.h> 88 89#include <sys/user.h> 90#include <sys/exec.h> 91#include <sys/cons.h> 92 93#include <ddb/ddb.h> 94 95#include <net/netisr.h> 96 97#include <machine/cpu.h> 98#include <machine/cputypes.h> 99#include <machine/reg.h> 100#include <machine/clock.h> 101#include <machine/specialreg.h> 102#include <machine/bootinfo.h> 103#include <machine/md_var.h> 104#include <machine/pc/bios.h> 105#include <machine/pcb_ext.h> /* pcb.h included via sys/user.h */ 106#include <machine/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#ifdef COMPAT_43 598 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#else /* !COMPAT_43 */ 701 return (ENOSYS); 702#endif /* COMPAT_43 */ 703} 704 705int 706sigreturn(td, uap) 707 struct thread *td; 708 struct sigreturn_args /* { 709 ucontext_t *sigcntxp; 710 } */ *uap; 711{ 712 struct proc *p = td->td_proc; 713 struct trapframe *regs; 714 ucontext_t *ucp; 715 int cs, eflags; 716 717 ucp = uap->sigcntxp; 718 if (!useracc((caddr_t)ucp, sizeof(*ucp), VM_PROT_READ)) 719 return (EFAULT); 720 regs = td->td_frame; 721 eflags = ucp->uc_mcontext.mc_eflags; 722 if (eflags & PSL_VM) { 723 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 724 struct vm86_kernel *vm86; 725 726 /* 727 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 728 * set up the vm86 area, and we can't enter vm86 mode. 729 */ 730 if (td->td_pcb->pcb_ext == 0) 731 return (EINVAL); 732 vm86 = &td->td_pcb->pcb_ext->ext_vm86; 733 if (vm86->vm86_inited == 0) 734 return (EINVAL); 735 736 /* Go back to user mode if both flags are set. */ 737 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 738 trapsignal(p, SIGBUS, 0); 739 740 if (vm86->vm86_has_vme) { 741 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 742 (eflags & VME_USERCHANGE) | PSL_VM; 743 } else { 744 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 745 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | 746 (eflags & VM_USERCHANGE) | PSL_VM; 747 } 748 bcopy(&ucp->uc_mcontext.mc_fs, tf, sizeof(struct trapframe)); 749 tf->tf_eflags = eflags; 750 tf->tf_vm86_ds = tf->tf_ds; 751 tf->tf_vm86_es = tf->tf_es; 752 tf->tf_vm86_fs = tf->tf_fs; 753 tf->tf_vm86_gs = ucp->uc_mcontext.mc_gs; 754 tf->tf_ds = _udatasel; 755 tf->tf_es = _udatasel; 756 tf->tf_fs = _udatasel; 757 } else { 758 /* 759 * Don't allow users to change privileged or reserved flags. 760 */ 761 /* 762 * XXX do allow users to change the privileged flag PSL_RF. 763 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 764 * should sometimes set it there too. tf_eflags is kept in 765 * the signal context during signal handling and there is no 766 * other place to remember it, so the PSL_RF bit may be 767 * corrupted by the signal handler without us knowing. 768 * Corruption of the PSL_RF bit at worst causes one more or 769 * one less debugger trap, so allowing it is fairly harmless. 770 */ 771 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) { 772 printf("sigreturn: eflags = 0x%x\n", eflags); 773 return (EINVAL); 774 } 775 776 /* 777 * Don't allow users to load a valid privileged %cs. Let the 778 * hardware check for invalid selectors, excess privilege in 779 * other selectors, invalid %eip's and invalid %esp's. 780 */ 781 cs = ucp->uc_mcontext.mc_cs; 782 if (!CS_SECURE(cs)) { 783 printf("sigreturn: cs = 0x%x\n", cs); 784 trapsignal(p, SIGBUS, T_PROTFLT); 785 return (EINVAL); 786 } 787 788 bcopy(&ucp->uc_mcontext.mc_fs, regs, sizeof(*regs)); 789 } 790 791 PROC_LOCK(p); 792#if defined(COMPAT_43) || defined(COMPAT_SUNOS) 793 if (ucp->uc_mcontext.mc_onstack & 1) 794 p->p_sigstk.ss_flags |= SS_ONSTACK; 795 else 796 p->p_sigstk.ss_flags &= ~SS_ONSTACK; 797#endif 798 799 p->p_sigmask = ucp->uc_sigmask; 800 SIG_CANTMASK(p->p_sigmask); 801 PROC_UNLOCK(p); 802 return (EJUSTRETURN); 803} 804 805/* 806 * Machine dependent boot() routine 807 * 808 * I haven't seen anything to put here yet 809 * Possibly some stuff might be grafted back here from boot() 810 */ 811void 812cpu_boot(int howto) 813{ 814} 815 816/* 817 * Shutdown the CPU as much as possible 818 */ 819void 820cpu_halt(void) 821{ 822 for (;;) 823 __asm__ ("hlt"); 824} 825 826/* 827 * Hook to idle the CPU when possible. This currently only works in 828 * the !SMP case, as there is no clean way to ensure that a CPU will be 829 * woken when there is work available for it. 830 */ 831static int cpu_idle_hlt = 1; 832SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW, 833 &cpu_idle_hlt, 0, "Idle loop HLT enable"); 834 835/* 836 * Note that we have to be careful here to avoid a race between checking 837 * procrunnable() and actually halting. If we don't do this, we may waste 838 * the time between calling hlt and the next interrupt even though there 839 * is a runnable process. 840 */ 841void 842cpu_idle(void) 843{ 844#ifndef SMP 845 if (cpu_idle_hlt) { 846 disable_intr(); 847 if (procrunnable()) 848 enable_intr(); 849 else { 850 enable_intr(); 851 __asm __volatile("hlt"); 852 } 853 } 854#endif 855} 856 857/* 858 * Clear registers on exec 859 */ 860void 861setregs(td, entry, stack, ps_strings) 862 struct thread *td; 863 u_long entry; 864 u_long stack; 865 u_long ps_strings; 866{ 867 struct trapframe *regs = td->td_frame; 868 struct pcb *pcb = td->td_pcb; 869 870 if (td->td_proc->p_md.md_ldt) 871 user_ldt_free(td); 872 873 bzero((char *)regs, sizeof(struct trapframe)); 874 regs->tf_eip = entry; 875 regs->tf_esp = stack; 876 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T); 877 regs->tf_ss = _udatasel; 878 regs->tf_ds = _udatasel; 879 regs->tf_es = _udatasel; 880 regs->tf_fs = _udatasel; 881 regs->tf_cs = _ucodesel; 882 883 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */ 884 regs->tf_ebx = ps_strings; 885 886 /* reset %gs as well */ 887 if (pcb == PCPU_GET(curpcb)) 888 load_gs(_udatasel); 889 else 890 pcb->pcb_gs = _udatasel; 891 892 /* 893 * Reset the hardware debug registers if they were in use. 894 * They won't have any meaning for the newly exec'd process. 895 */ 896 if (pcb->pcb_flags & PCB_DBREGS) { 897 pcb->pcb_dr0 = 0; 898 pcb->pcb_dr1 = 0; 899 pcb->pcb_dr2 = 0; 900 pcb->pcb_dr3 = 0; 901 pcb->pcb_dr6 = 0; 902 pcb->pcb_dr7 = 0; 903 if (pcb == PCPU_GET(curpcb)) { 904 /* 905 * Clear the debug registers on the running 906 * CPU, otherwise they will end up affecting 907 * the next process we switch to. 908 */ 909 reset_dbregs(); 910 } 911 pcb->pcb_flags &= ~PCB_DBREGS; 912 } 913 914 /* 915 * Initialize the math emulator (if any) for the current process. 916 * Actually, just clear the bit that says that the emulator has 917 * been initialized. Initialization is delayed until the process 918 * traps to the emulator (if it is done at all) mainly because 919 * emulators don't provide an entry point for initialization. 920 */ 921 td->td_pcb->pcb_flags &= ~FP_SOFTFP; 922 923 /* 924 * Arrange to trap the next npx or `fwait' instruction (see npx.c 925 * for why fwait must be trapped at least if there is an npx or an 926 * emulator). This is mainly to handle the case where npx0 is not 927 * configured, since the npx routines normally set up the trap 928 * otherwise. It should be done only at boot time, but doing it 929 * here allows modifying `npx_exists' for testing the emulator on 930 * systems with an npx. 931 */ 932 load_cr0(rcr0() | CR0_MP | CR0_TS); 933 934#ifdef DEV_NPX 935 /* Initialize the npx (if any) for the current process. */ 936 npxinit(__INITIAL_NPXCW__); 937#endif 938 939 /* 940 * XXX - Linux emulator 941 * Make sure sure edx is 0x0 on entry. Linux binaries depend 942 * on it. 943 */ 944 td->td_retval[1] = 0; 945} 946 947void 948cpu_setregs(void) 949{ 950 unsigned int cr0; 951 952 cr0 = rcr0(); 953#ifdef SMP 954 cr0 |= CR0_NE; /* Done by npxinit() */ 955#endif 956 cr0 |= CR0_MP | CR0_TS; /* Done at every execve() too. */ 957#ifndef I386_CPU 958 cr0 |= CR0_WP | CR0_AM; 959#endif 960 load_cr0(cr0); 961 load_gs(_udatasel); 962} 963 964static int 965sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS) 966{ 967 int error; 968 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 969 req); 970 if (!error && req->newptr) 971 resettodr(); 972 return (error); 973} 974 975SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 976 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 977 978SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, 979 CTLFLAG_RW, &disable_rtc_set, 0, ""); 980 981SYSCTL_STRUCT(_machdep, CPU_BOOTINFO, bootinfo, 982 CTLFLAG_RD, &bootinfo, bootinfo, ""); 983 984SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock, 985 CTLFLAG_RW, &wall_cmos_clock, 0, ""); 986 987/* 988 * Initialize 386 and configure to run kernel 989 */ 990 991/* 992 * Initialize segments & interrupt table 993 */ 994 995int _default_ldt; 996union descriptor gdt[NGDT * MAXCPU]; /* global descriptor table */ 997static struct gate_descriptor idt0[NIDT]; 998struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */ 999union descriptor ldt[NLDT]; /* local descriptor table */ 1000#ifdef SMP 1001/* table descriptors - used to load tables by microp */ 1002struct region_descriptor r_gdt, r_idt; 1003#endif 1004 1005int private_tss; /* flag indicating private tss */ 1006 1007#if defined(I586_CPU) && !defined(NO_F00F_HACK) 1008extern int has_f00f_bug; 1009#endif 1010 1011static struct i386tss dblfault_tss; 1012static char dblfault_stack[PAGE_SIZE]; 1013 1014extern struct user *proc0uarea; 1015extern vm_offset_t proc0kstack; 1016 1017 1018/* software prototypes -- in more palatable form */ 1019struct soft_segment_descriptor gdt_segs[] = { 1020/* GNULL_SEL 0 Null Descriptor */ 1021{ 0x0, /* segment base address */ 1022 0x0, /* length */ 1023 0, /* segment type */ 1024 0, /* segment descriptor priority level */ 1025 0, /* segment descriptor present */ 1026 0, 0, 1027 0, /* default 32 vs 16 bit size */ 1028 0 /* limit granularity (byte/page units)*/ }, 1029/* GCODE_SEL 1 Code Descriptor for kernel */ 1030{ 0x0, /* segment base address */ 1031 0xfffff, /* length - all address space */ 1032 SDT_MEMERA, /* segment type */ 1033 0, /* segment descriptor priority level */ 1034 1, /* segment descriptor present */ 1035 0, 0, 1036 1, /* default 32 vs 16 bit size */ 1037 1 /* limit granularity (byte/page units)*/ }, 1038/* GDATA_SEL 2 Data Descriptor for kernel */ 1039{ 0x0, /* segment base address */ 1040 0xfffff, /* length - all address space */ 1041 SDT_MEMRWA, /* segment type */ 1042 0, /* segment descriptor priority level */ 1043 1, /* segment descriptor present */ 1044 0, 0, 1045 1, /* default 32 vs 16 bit size */ 1046 1 /* limit granularity (byte/page units)*/ }, 1047/* GPRIV_SEL 3 SMP Per-Processor Private Data Descriptor */ 1048{ 0x0, /* segment base address */ 1049 0xfffff, /* length - all address space */ 1050 SDT_MEMRWA, /* segment type */ 1051 0, /* segment descriptor priority level */ 1052 1, /* segment descriptor present */ 1053 0, 0, 1054 1, /* default 32 vs 16 bit size */ 1055 1 /* limit granularity (byte/page units)*/ }, 1056/* GPROC0_SEL 4 Proc 0 Tss Descriptor */ 1057{ 1058 0x0, /* segment base address */ 1059 sizeof(struct i386tss)-1,/* length - all address space */ 1060 SDT_SYS386TSS, /* segment type */ 1061 0, /* segment descriptor priority level */ 1062 1, /* segment descriptor present */ 1063 0, 0, 1064 0, /* unused - default 32 vs 16 bit size */ 1065 0 /* limit granularity (byte/page units)*/ }, 1066/* GLDT_SEL 5 LDT Descriptor */ 1067{ (int) ldt, /* segment base address */ 1068 sizeof(ldt)-1, /* length - all address space */ 1069 SDT_SYSLDT, /* segment type */ 1070 SEL_UPL, /* segment descriptor priority level */ 1071 1, /* segment descriptor present */ 1072 0, 0, 1073 0, /* unused - default 32 vs 16 bit size */ 1074 0 /* limit granularity (byte/page units)*/ }, 1075/* GUSERLDT_SEL 6 User LDT Descriptor per process */ 1076{ (int) ldt, /* segment base address */ 1077 (512 * sizeof(union descriptor)-1), /* length */ 1078 SDT_SYSLDT, /* segment type */ 1079 0, /* segment descriptor priority level */ 1080 1, /* segment descriptor present */ 1081 0, 0, 1082 0, /* unused - default 32 vs 16 bit size */ 1083 0 /* limit granularity (byte/page units)*/ }, 1084/* GTGATE_SEL 7 Null Descriptor - Placeholder */ 1085{ 0x0, /* segment base address */ 1086 0x0, /* length - all address space */ 1087 0, /* segment type */ 1088 0, /* segment descriptor priority level */ 1089 0, /* segment descriptor present */ 1090 0, 0, 1091 0, /* default 32 vs 16 bit size */ 1092 0 /* limit granularity (byte/page units)*/ }, 1093/* GBIOSLOWMEM_SEL 8 BIOS access to realmode segment 0x40, must be #8 in GDT */ 1094{ 0x400, /* segment base address */ 1095 0xfffff, /* length */ 1096 SDT_MEMRWA, /* segment type */ 1097 0, /* segment descriptor priority level */ 1098 1, /* segment descriptor present */ 1099 0, 0, 1100 1, /* default 32 vs 16 bit size */ 1101 1 /* limit granularity (byte/page units)*/ }, 1102/* GPANIC_SEL 9 Panic Tss Descriptor */ 1103{ (int) &dblfault_tss, /* segment base address */ 1104 sizeof(struct i386tss)-1,/* length - all address space */ 1105 SDT_SYS386TSS, /* segment type */ 1106 0, /* segment descriptor priority level */ 1107 1, /* segment descriptor present */ 1108 0, 0, 1109 0, /* unused - default 32 vs 16 bit size */ 1110 0 /* limit granularity (byte/page units)*/ }, 1111/* GBIOSCODE32_SEL 10 BIOS 32-bit interface (32bit Code) */ 1112{ 0, /* segment base address (overwritten) */ 1113 0xfffff, /* length */ 1114 SDT_MEMERA, /* segment type */ 1115 0, /* segment descriptor priority level */ 1116 1, /* segment descriptor present */ 1117 0, 0, 1118 0, /* default 32 vs 16 bit size */ 1119 1 /* limit granularity (byte/page units)*/ }, 1120/* GBIOSCODE16_SEL 11 BIOS 32-bit interface (16bit Code) */ 1121{ 0, /* segment base address (overwritten) */ 1122 0xfffff, /* length */ 1123 SDT_MEMERA, /* segment type */ 1124 0, /* segment descriptor priority level */ 1125 1, /* segment descriptor present */ 1126 0, 0, 1127 0, /* default 32 vs 16 bit size */ 1128 1 /* limit granularity (byte/page units)*/ }, 1129/* GBIOSDATA_SEL 12 BIOS 32-bit interface (Data) */ 1130{ 0, /* segment base address (overwritten) */ 1131 0xfffff, /* length */ 1132 SDT_MEMRWA, /* segment type */ 1133 0, /* segment descriptor priority level */ 1134 1, /* segment descriptor present */ 1135 0, 0, 1136 1, /* default 32 vs 16 bit size */ 1137 1 /* limit granularity (byte/page units)*/ }, 1138/* GBIOSUTIL_SEL 13 BIOS 16-bit interface (Utility) */ 1139{ 0, /* segment base address (overwritten) */ 1140 0xfffff, /* length */ 1141 SDT_MEMRWA, /* segment type */ 1142 0, /* segment descriptor priority level */ 1143 1, /* segment descriptor present */ 1144 0, 0, 1145 0, /* default 32 vs 16 bit size */ 1146 1 /* limit granularity (byte/page units)*/ }, 1147/* GBIOSARGS_SEL 14 BIOS 16-bit interface (Arguments) */ 1148{ 0, /* segment base address (overwritten) */ 1149 0xfffff, /* length */ 1150 SDT_MEMRWA, /* segment type */ 1151 0, /* segment descriptor priority level */ 1152 1, /* segment descriptor present */ 1153 0, 0, 1154 0, /* default 32 vs 16 bit size */ 1155 1 /* limit granularity (byte/page units)*/ }, 1156}; 1157 1158static struct soft_segment_descriptor ldt_segs[] = { 1159 /* Null Descriptor - overwritten by call gate */ 1160{ 0x0, /* segment base address */ 1161 0x0, /* length - all address space */ 1162 0, /* segment type */ 1163 0, /* segment descriptor priority level */ 1164 0, /* segment descriptor present */ 1165 0, 0, 1166 0, /* default 32 vs 16 bit size */ 1167 0 /* limit granularity (byte/page units)*/ }, 1168 /* Null Descriptor - overwritten by call gate */ 1169{ 0x0, /* segment base address */ 1170 0x0, /* length - all address space */ 1171 0, /* segment type */ 1172 0, /* segment descriptor priority level */ 1173 0, /* segment descriptor present */ 1174 0, 0, 1175 0, /* default 32 vs 16 bit size */ 1176 0 /* limit granularity (byte/page units)*/ }, 1177 /* Null Descriptor - overwritten by call gate */ 1178{ 0x0, /* segment base address */ 1179 0x0, /* length - all address space */ 1180 0, /* segment type */ 1181 0, /* segment descriptor priority level */ 1182 0, /* segment descriptor present */ 1183 0, 0, 1184 0, /* default 32 vs 16 bit size */ 1185 0 /* limit granularity (byte/page units)*/ }, 1186 /* Code Descriptor for user */ 1187{ 0x0, /* segment base address */ 1188 0xfffff, /* length - all address space */ 1189 SDT_MEMERA, /* segment type */ 1190 SEL_UPL, /* segment descriptor priority level */ 1191 1, /* segment descriptor present */ 1192 0, 0, 1193 1, /* default 32 vs 16 bit size */ 1194 1 /* limit granularity (byte/page units)*/ }, 1195 /* Null Descriptor - overwritten by call gate */ 1196{ 0x0, /* segment base address */ 1197 0x0, /* length - all address space */ 1198 0, /* segment type */ 1199 0, /* segment descriptor priority level */ 1200 0, /* segment descriptor present */ 1201 0, 0, 1202 0, /* default 32 vs 16 bit size */ 1203 0 /* limit granularity (byte/page units)*/ }, 1204 /* Data Descriptor for user */ 1205{ 0x0, /* segment base address */ 1206 0xfffff, /* length - all address space */ 1207 SDT_MEMRWA, /* segment type */ 1208 SEL_UPL, /* segment descriptor priority level */ 1209 1, /* segment descriptor present */ 1210 0, 0, 1211 1, /* default 32 vs 16 bit size */ 1212 1 /* limit granularity (byte/page units)*/ }, 1213}; 1214 1215void 1216setidt(idx, func, typ, dpl, selec) 1217 int idx; 1218 inthand_t *func; 1219 int typ; 1220 int dpl; 1221 int selec; 1222{ 1223 struct gate_descriptor *ip; 1224 1225 ip = idt + idx; 1226 ip->gd_looffset = (int)func; 1227 ip->gd_selector = selec; 1228 ip->gd_stkcpy = 0; 1229 ip->gd_xx = 0; 1230 ip->gd_type = typ; 1231 ip->gd_dpl = dpl; 1232 ip->gd_p = 1; 1233 ip->gd_hioffset = ((int)func)>>16 ; 1234} 1235 1236#define IDTVEC(name) __CONCAT(X,name) 1237 1238extern inthand_t 1239 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 1240 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 1241 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 1242 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 1243 IDTVEC(xmm), IDTVEC(lcall_syscall), IDTVEC(int0x80_syscall); 1244 1245void 1246sdtossd(sd, ssd) 1247 struct segment_descriptor *sd; 1248 struct soft_segment_descriptor *ssd; 1249{ 1250 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 1251 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 1252 ssd->ssd_type = sd->sd_type; 1253 ssd->ssd_dpl = sd->sd_dpl; 1254 ssd->ssd_p = sd->sd_p; 1255 ssd->ssd_def32 = sd->sd_def32; 1256 ssd->ssd_gran = sd->sd_gran; 1257} 1258 1259#define PHYSMAP_SIZE (2 * 8) 1260 1261/* 1262 * Populate the (physmap) array with base/bound pairs describing the 1263 * available physical memory in the system, then test this memory and 1264 * build the phys_avail array describing the actually-available memory. 1265 * 1266 * If we cannot accurately determine the physical memory map, then use 1267 * value from the 0xE801 call, and failing that, the RTC. 1268 * 1269 * Total memory size may be set by the kernel environment variable 1270 * hw.physmem or the compile-time define MAXMEM. 1271 */ 1272static void 1273getmemsize(int first) 1274{ 1275 int i, physmap_idx, pa_indx; 1276 u_int basemem, extmem; 1277 struct vm86frame vmf; 1278 struct vm86context vmc; 1279 vm_offset_t pa, physmap[PHYSMAP_SIZE]; 1280 pt_entry_t *pte; 1281 const char *cp; 1282 struct bios_smap *smap; 1283 1284 bzero(&vmf, sizeof(struct vm86frame)); 1285 bzero(physmap, sizeof(physmap)); 1286 1287 /* 1288 * Perform "base memory" related probes & setup 1289 */ 1290 vm86_intcall(0x12, &vmf); 1291 basemem = vmf.vmf_ax; 1292 if (basemem > 640) { 1293 printf("Preposterous BIOS basemem of %uK, truncating to 640K\n", 1294 basemem); 1295 basemem = 640; 1296 } 1297 1298 /* 1299 * XXX if biosbasemem is now < 640, there is a `hole' 1300 * between the end of base memory and the start of 1301 * ISA memory. The hole may be empty or it may 1302 * contain BIOS code or data. Map it read/write so 1303 * that the BIOS can write to it. (Memory from 0 to 1304 * the physical end of the kernel is mapped read-only 1305 * to begin with and then parts of it are remapped. 1306 * The parts that aren't remapped form holes that 1307 * remain read-only and are unused by the kernel. 1308 * The base memory area is below the physical end of 1309 * the kernel and right now forms a read-only hole. 1310 * The part of it from PAGE_SIZE to 1311 * (trunc_page(biosbasemem * 1024) - 1) will be 1312 * remapped and used by the kernel later.) 1313 * 1314 * This code is similar to the code used in 1315 * pmap_mapdev, but since no memory needs to be 1316 * allocated we simply change the mapping. 1317 */ 1318 for (pa = trunc_page(basemem * 1024); 1319 pa < ISA_HOLE_START; pa += PAGE_SIZE) { 1320 pte = vtopte(pa + KERNBASE); 1321 *pte = pa | PG_RW | PG_V; 1322 } 1323 1324 /* 1325 * if basemem != 640, map pages r/w into vm86 page table so 1326 * that the bios can scribble on it. 1327 */ 1328 pte = (pt_entry_t *)vm86paddr; 1329 for (i = basemem / 4; i < 160; i++) 1330 pte[i] = (i << PAGE_SHIFT) | PG_V | PG_RW | PG_U; 1331 1332 /* 1333 * map page 1 R/W into the kernel page table so we can use it 1334 * as a buffer. The kernel will unmap this page later. 1335 */ 1336 pte = vtopte(KERNBASE + (1 << PAGE_SHIFT)); 1337 *pte = (1 << PAGE_SHIFT) | PG_RW | PG_V; 1338 1339 /* 1340 * get memory map with INT 15:E820 1341 */ 1342 vmc.npages = 0; 1343 smap = (void *)vm86_addpage(&vmc, 1, KERNBASE + (1 << PAGE_SHIFT)); 1344 vm86_getptr(&vmc, (vm_offset_t)smap, &vmf.vmf_es, &vmf.vmf_di); 1345 1346 physmap_idx = 0; 1347 vmf.vmf_ebx = 0; 1348 do { 1349 vmf.vmf_eax = 0xE820; 1350 vmf.vmf_edx = SMAP_SIG; 1351 vmf.vmf_ecx = sizeof(struct bios_smap); 1352 i = vm86_datacall(0x15, &vmf, &vmc); 1353 if (i || vmf.vmf_eax != SMAP_SIG) 1354 break; 1355 if (boothowto & RB_VERBOSE) 1356 printf("SMAP type=%02x base=%08x %08x len=%08x %08x\n", 1357 smap->type, 1358 *(u_int32_t *)((char *)&smap->base + 4), 1359 (u_int32_t)smap->base, 1360 *(u_int32_t *)((char *)&smap->length + 4), 1361 (u_int32_t)smap->length); 1362 1363 if (smap->type != 0x01) 1364 goto next_run; 1365 1366 if (smap->length == 0) 1367 goto next_run; 1368 1369 if (smap->base >= 0xffffffff) { 1370 printf("%uK of memory above 4GB ignored\n", 1371 (u_int)(smap->length / 1024)); 1372 goto next_run; 1373 } 1374 1375 for (i = 0; i <= physmap_idx; i += 2) { 1376 if (smap->base < physmap[i + 1]) { 1377 if (boothowto & RB_VERBOSE) 1378 printf( 1379 "Overlapping or non-montonic memory region, ignoring second region\n"); 1380 goto next_run; 1381 } 1382 } 1383 1384 if (smap->base == physmap[physmap_idx + 1]) { 1385 physmap[physmap_idx + 1] += smap->length; 1386 goto next_run; 1387 } 1388 1389 physmap_idx += 2; 1390 if (physmap_idx == PHYSMAP_SIZE) { 1391 printf( 1392 "Too many segments in the physical address map, giving up\n"); 1393 break; 1394 } 1395 physmap[physmap_idx] = smap->base; 1396 physmap[physmap_idx + 1] = smap->base + smap->length; 1397next_run: 1398 } while (vmf.vmf_ebx != 0); 1399 1400 if (physmap[1] != 0) 1401 goto physmap_done; 1402 1403 /* 1404 * If we failed above, try memory map with INT 15:E801 1405 */ 1406 vmf.vmf_ax = 0xE801; 1407 if (vm86_intcall(0x15, &vmf) == 0) { 1408 extmem = vmf.vmf_cx + vmf.vmf_dx * 64; 1409 } else { 1410#if 0 1411 vmf.vmf_ah = 0x88; 1412 vm86_intcall(0x15, &vmf); 1413 extmem = vmf.vmf_ax; 1414#else 1415 /* 1416 * Prefer the RTC value for extended memory. 1417 */ 1418 extmem = rtcin(RTC_EXTLO) + (rtcin(RTC_EXTHI) << 8); 1419#endif 1420 } 1421 1422 /* 1423 * Special hack for chipsets that still remap the 384k hole when 1424 * there's 16MB of memory - this really confuses people that 1425 * are trying to use bus mastering ISA controllers with the 1426 * "16MB limit"; they only have 16MB, but the remapping puts 1427 * them beyond the limit. 1428 * 1429 * If extended memory is between 15-16MB (16-17MB phys address range), 1430 * chop it to 15MB. 1431 */ 1432 if ((extmem > 15 * 1024) && (extmem < 16 * 1024)) 1433 extmem = 15 * 1024; 1434 1435 physmap[0] = 0; 1436 physmap[1] = basemem * 1024; 1437 physmap_idx = 2; 1438 physmap[physmap_idx] = 0x100000; 1439 physmap[physmap_idx + 1] = physmap[physmap_idx] + extmem * 1024; 1440 1441physmap_done: 1442 /* 1443 * Now, physmap contains a map of physical memory. 1444 */ 1445 1446#ifdef SMP 1447 /* make hole for AP bootstrap code */ 1448 physmap[1] = mp_bootaddress(physmap[1] / 1024); 1449 1450 /* look for the MP hardware - needed for apic addresses */ 1451 i386_mp_probe(); 1452#endif 1453 1454 /* 1455 * Maxmem isn't the "maximum memory", it's one larger than the 1456 * highest page of the physical address space. It should be 1457 * called something like "Maxphyspage". We may adjust this 1458 * based on ``hw.physmem'' and the results of the memory test. 1459 */ 1460 Maxmem = atop(physmap[physmap_idx + 1]); 1461 1462#ifdef MAXMEM 1463 Maxmem = MAXMEM / 4; 1464#endif 1465 1466 /* 1467 * hw.physmem is a size in bytes; we also allow k, m, and g suffixes 1468 * for the appropriate modifiers. This overrides MAXMEM. 1469 */ 1470 if ((cp = getenv("hw.physmem")) != NULL) { 1471 u_int64_t AllowMem, sanity; 1472 char *ep; 1473 1474 sanity = AllowMem = strtouq(cp, &ep, 0); 1475 if ((ep != cp) && (*ep != 0)) { 1476 switch(*ep) { 1477 case 'g': 1478 case 'G': 1479 AllowMem <<= 10; 1480 case 'm': 1481 case 'M': 1482 AllowMem <<= 10; 1483 case 'k': 1484 case 'K': 1485 AllowMem <<= 10; 1486 break; 1487 default: 1488 AllowMem = sanity = 0; 1489 } 1490 if (AllowMem < sanity) 1491 AllowMem = 0; 1492 } 1493 if (AllowMem == 0) 1494 printf("Ignoring invalid memory size of '%s'\n", cp); 1495 else 1496 Maxmem = atop(AllowMem); 1497 } 1498 1499 if (atop(physmap[physmap_idx + 1]) != Maxmem && 1500 (boothowto & RB_VERBOSE)) 1501 printf("Physical memory use set to %uK\n", Maxmem * 4); 1502 1503 /* 1504 * If Maxmem has been increased beyond what the system has detected, 1505 * extend the last memory segment to the new limit. 1506 */ 1507 if (atop(physmap[physmap_idx + 1]) < Maxmem) 1508 physmap[physmap_idx + 1] = ptoa(Maxmem); 1509 1510 /* call pmap initialization to make new kernel address space */ 1511 pmap_bootstrap(first, 0); 1512 1513 /* 1514 * Size up each available chunk of physical memory. 1515 */ 1516 physmap[0] = PAGE_SIZE; /* mask off page 0 */ 1517 pa_indx = 0; 1518 phys_avail[pa_indx++] = physmap[0]; 1519 phys_avail[pa_indx] = physmap[0]; 1520#if 0 1521 pte = vtopte(KERNBASE); 1522#else 1523 pte = CMAP1; 1524#endif 1525 1526 /* 1527 * physmap is in bytes, so when converting to page boundaries, 1528 * round up the start address and round down the end address. 1529 */ 1530 for (i = 0; i <= physmap_idx; i += 2) { 1531 vm_offset_t end; 1532 1533 end = ptoa(Maxmem); 1534 if (physmap[i + 1] < end) 1535 end = trunc_page(physmap[i + 1]); 1536 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) { 1537 int tmp, page_bad; 1538#if 0 1539 int *ptr = 0; 1540#else 1541 int *ptr = (int *)CADDR1; 1542#endif 1543 1544 /* 1545 * block out kernel memory as not available. 1546 */ 1547 if (pa >= 0x100000 && pa < first) 1548 continue; 1549 1550 page_bad = FALSE; 1551 1552 /* 1553 * map page into kernel: valid, read/write,non-cacheable 1554 */ 1555 *pte = pa | PG_V | PG_RW | PG_N; 1556 invltlb(); 1557 1558 tmp = *(int *)ptr; 1559 /* 1560 * Test for alternating 1's and 0's 1561 */ 1562 *(volatile int *)ptr = 0xaaaaaaaa; 1563 if (*(volatile int *)ptr != 0xaaaaaaaa) { 1564 page_bad = TRUE; 1565 } 1566 /* 1567 * Test for alternating 0's and 1's 1568 */ 1569 *(volatile int *)ptr = 0x55555555; 1570 if (*(volatile int *)ptr != 0x55555555) { 1571 page_bad = TRUE; 1572 } 1573 /* 1574 * Test for all 1's 1575 */ 1576 *(volatile int *)ptr = 0xffffffff; 1577 if (*(volatile int *)ptr != 0xffffffff) { 1578 page_bad = TRUE; 1579 } 1580 /* 1581 * Test for all 0's 1582 */ 1583 *(volatile int *)ptr = 0x0; 1584 if (*(volatile int *)ptr != 0x0) { 1585 page_bad = TRUE; 1586 } 1587 /* 1588 * Restore original value. 1589 */ 1590 *(int *)ptr = tmp; 1591 1592 /* 1593 * Adjust array of valid/good pages. 1594 */ 1595 if (page_bad == TRUE) { 1596 continue; 1597 } 1598 /* 1599 * If this good page is a continuation of the 1600 * previous set of good pages, then just increase 1601 * the end pointer. Otherwise start a new chunk. 1602 * Note that "end" points one higher than end, 1603 * making the range >= start and < end. 1604 * If we're also doing a speculative memory 1605 * test and we at or past the end, bump up Maxmem 1606 * so that we keep going. The first bad page 1607 * will terminate the loop. 1608 */ 1609 if (phys_avail[pa_indx] == pa) { 1610 phys_avail[pa_indx] += PAGE_SIZE; 1611 } else { 1612 pa_indx++; 1613 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 1614 printf( 1615 "Too many holes in the physical address space, giving up\n"); 1616 pa_indx--; 1617 break; 1618 } 1619 phys_avail[pa_indx++] = pa; /* start */ 1620 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */ 1621 } 1622 physmem++; 1623 } 1624 } 1625 *pte = 0; 1626 invltlb(); 1627 1628 /* 1629 * XXX 1630 * The last chunk must contain at least one page plus the message 1631 * buffer to avoid complicating other code (message buffer address 1632 * calculation, etc.). 1633 */ 1634 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 1635 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) { 1636 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 1637 phys_avail[pa_indx--] = 0; 1638 phys_avail[pa_indx--] = 0; 1639 } 1640 1641 Maxmem = atop(phys_avail[pa_indx]); 1642 1643 /* Trim off space for the message buffer. */ 1644 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE); 1645 1646 avail_end = phys_avail[pa_indx]; 1647} 1648 1649void 1650init386(first) 1651 int first; 1652{ 1653 struct gate_descriptor *gdp; 1654 int gsel_tss, metadata_missing, off, x; 1655#ifndef SMP 1656 /* table descriptors - used to load tables by microp */ 1657 struct region_descriptor r_gdt, r_idt; 1658#endif 1659 struct pcpu *pc; 1660 1661 1662 proc0.p_uarea = proc0uarea; 1663 thread0.td_kstack = proc0kstack; 1664 thread0.td_pcb = (struct pcb *) 1665 (thread0.td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1; 1666 atdevbase = ISA_HOLE_START + KERNBASE; 1667 1668 /* 1669 * This may be done better later if it gets more 1670 * high level components in it. If so just link td->td_proc 1671 * here. 1672 */ 1673 proc_linkup(&proc0, &proc0.p_ksegrp, &proc0.p_kse, &thread0); 1674 1675 metadata_missing = 0; 1676 if (bootinfo.bi_modulep) { 1677 preload_metadata = (caddr_t)bootinfo.bi_modulep + KERNBASE; 1678 preload_bootstrap_relocate(KERNBASE); 1679 } else { 1680 metadata_missing = 1; 1681 } 1682 if (envmode == 1) 1683 kern_envp = static_env; 1684 else if (bootinfo.bi_envp) 1685 kern_envp = (caddr_t)bootinfo.bi_envp + KERNBASE; 1686 1687 /* Init basic tunables, hz etc */ 1688 init_param1(); 1689 1690 /* 1691 * make gdt memory segments, the code segment goes up to end of the 1692 * page with etext in it, the data segment goes to the end of 1693 * the address space 1694 */ 1695 /* 1696 * XXX text protection is temporarily (?) disabled. The limit was 1697 * i386_btop(round_page(etext)) - 1. 1698 */ 1699 gdt_segs[GCODE_SEL].ssd_limit = atop(0 - 1); 1700 gdt_segs[GDATA_SEL].ssd_limit = atop(0 - 1); 1701#ifdef SMP 1702 pc = &SMP_prvspace[0]; 1703 gdt_segs[GPRIV_SEL].ssd_limit = 1704 atop(sizeof(struct privatespace) - 1); 1705#else 1706 pc = &__pcpu; 1707 gdt_segs[GPRIV_SEL].ssd_limit = 1708 atop(sizeof(struct pcpu) - 1); 1709#endif 1710 gdt_segs[GPRIV_SEL].ssd_base = (int) pc; 1711 gdt_segs[GPROC0_SEL].ssd_base = (int) &pc->pc_common_tss; 1712 1713 for (x = 0; x < NGDT; x++) { 1714#ifdef BDE_DEBUGGER 1715 /* avoid overwriting db entries with APM ones */ 1716 if (x >= GAPMCODE32_SEL && x <= GAPMDATA_SEL) 1717 continue; 1718#endif 1719 ssdtosd(&gdt_segs[x], &gdt[x].sd); 1720 } 1721 1722 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1; 1723 r_gdt.rd_base = (int) gdt; 1724 lgdt(&r_gdt); 1725 1726 pcpu_init(pc, 0, sizeof(struct pcpu)); 1727 PCPU_SET(prvspace, pc); 1728 1729 /* setup curproc so that mutexes work */ 1730 PCPU_SET(curthread, &thread0); 1731 1732 LIST_INIT(&thread0.td_contested); 1733 1734 /* 1735 * Initialize mutexes. 1736 */ 1737 mtx_init(&Giant, "Giant", MTX_DEF | MTX_RECURSE); 1738 mtx_init(&sched_lock, "sched lock", MTX_SPIN | MTX_RECURSE); 1739 mtx_init(&proc0.p_mtx, "process lock", MTX_DEF); 1740 mtx_init(&clock_lock, "clk", MTX_SPIN | MTX_RECURSE); 1741 mtx_init(&icu_lock, "icu", MTX_SPIN); 1742 mtx_lock(&Giant); 1743 1744 /* make ldt memory segments */ 1745 /* 1746 * XXX - VM_MAXUSER_ADDRESS is an end address, not a max. And it 1747 * should be spelled ...MAX_USER... 1748 */ 1749 ldt_segs[LUCODE_SEL].ssd_limit = atop(VM_MAXUSER_ADDRESS - 1); 1750 ldt_segs[LUDATA_SEL].ssd_limit = atop(VM_MAXUSER_ADDRESS - 1); 1751 for (x = 0; x < sizeof ldt_segs / sizeof ldt_segs[0]; x++) 1752 ssdtosd(&ldt_segs[x], &ldt[x].sd); 1753 1754 _default_ldt = GSEL(GLDT_SEL, SEL_KPL); 1755 lldt(_default_ldt); 1756 PCPU_SET(currentldt, _default_ldt); 1757 1758 /* exceptions */ 1759 for (x = 0; x < NIDT; x++) 1760 setidt(x, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, 1761 GSEL(GCODE_SEL, SEL_KPL)); 1762 setidt(0, &IDTVEC(div), SDT_SYS386TGT, SEL_KPL, 1763 GSEL(GCODE_SEL, SEL_KPL)); 1764 setidt(1, &IDTVEC(dbg), SDT_SYS386IGT, SEL_KPL, 1765 GSEL(GCODE_SEL, SEL_KPL)); 1766 setidt(2, &IDTVEC(nmi), SDT_SYS386TGT, SEL_KPL, 1767 GSEL(GCODE_SEL, SEL_KPL)); 1768 setidt(3, &IDTVEC(bpt), SDT_SYS386IGT, SEL_UPL, 1769 GSEL(GCODE_SEL, SEL_KPL)); 1770 setidt(4, &IDTVEC(ofl), SDT_SYS386TGT, SEL_UPL, 1771 GSEL(GCODE_SEL, SEL_KPL)); 1772 setidt(5, &IDTVEC(bnd), SDT_SYS386TGT, SEL_KPL, 1773 GSEL(GCODE_SEL, SEL_KPL)); 1774 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, 1775 GSEL(GCODE_SEL, SEL_KPL)); 1776 setidt(7, &IDTVEC(dna), SDT_SYS386TGT, SEL_KPL 1777 , GSEL(GCODE_SEL, SEL_KPL)); 1778 setidt(8, 0, SDT_SYSTASKGT, SEL_KPL, GSEL(GPANIC_SEL, SEL_KPL)); 1779 setidt(9, &IDTVEC(fpusegm), SDT_SYS386TGT, SEL_KPL, 1780 GSEL(GCODE_SEL, SEL_KPL)); 1781 setidt(10, &IDTVEC(tss), SDT_SYS386TGT, SEL_KPL, 1782 GSEL(GCODE_SEL, SEL_KPL)); 1783 setidt(11, &IDTVEC(missing), SDT_SYS386TGT, SEL_KPL, 1784 GSEL(GCODE_SEL, SEL_KPL)); 1785 setidt(12, &IDTVEC(stk), SDT_SYS386TGT, SEL_KPL, 1786 GSEL(GCODE_SEL, SEL_KPL)); 1787 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, 1788 GSEL(GCODE_SEL, SEL_KPL)); 1789 setidt(14, &IDTVEC(page), SDT_SYS386IGT, SEL_KPL, 1790 GSEL(GCODE_SEL, SEL_KPL)); 1791 setidt(15, &IDTVEC(rsvd), SDT_SYS386TGT, SEL_KPL, 1792 GSEL(GCODE_SEL, SEL_KPL)); 1793 setidt(16, &IDTVEC(fpu), SDT_SYS386TGT, SEL_KPL, 1794 GSEL(GCODE_SEL, SEL_KPL)); 1795 setidt(17, &IDTVEC(align), SDT_SYS386TGT, SEL_KPL, 1796 GSEL(GCODE_SEL, SEL_KPL)); 1797 setidt(18, &IDTVEC(mchk), SDT_SYS386TGT, SEL_KPL, 1798 GSEL(GCODE_SEL, SEL_KPL)); 1799 setidt(19, &IDTVEC(xmm), SDT_SYS386TGT, SEL_KPL, 1800 GSEL(GCODE_SEL, SEL_KPL)); 1801 setidt(0x80, &IDTVEC(int0x80_syscall), SDT_SYS386TGT, SEL_UPL, 1802 GSEL(GCODE_SEL, SEL_KPL)); 1803 1804 r_idt.rd_limit = sizeof(idt0) - 1; 1805 r_idt.rd_base = (int) idt; 1806 lidt(&r_idt); 1807 1808 /* 1809 * Initialize the console before we print anything out. 1810 */ 1811 cninit(); 1812 1813 if (metadata_missing) 1814 printf("WARNING: loader(8) metadata is missing!\n"); 1815 1816#ifdef DEV_ISA 1817 isa_defaultirq(); 1818#endif 1819 1820#ifdef DDB 1821 kdb_init(); 1822 if (boothowto & RB_KDB) 1823 Debugger("Boot flags requested debugger"); 1824#endif 1825 1826 finishidentcpu(); /* Final stage of CPU initialization */ 1827 setidt(6, &IDTVEC(ill), SDT_SYS386TGT, SEL_KPL, 1828 GSEL(GCODE_SEL, SEL_KPL)); 1829 setidt(13, &IDTVEC(prot), SDT_SYS386TGT, SEL_KPL, 1830 GSEL(GCODE_SEL, SEL_KPL)); 1831 initializecpu(); /* Initialize CPU registers */ 1832 1833 /* make an initial tss so cpu can get interrupt stack on syscall! */ 1834 /* Note: -16 is so we can grow the trapframe if we came from vm86 */ 1835 PCPU_SET(common_tss.tss_esp0, thread0.td_kstack + 1836 KSTACK_PAGES * PAGE_SIZE - sizeof(struct pcb) - 16); 1837 PCPU_SET(common_tss.tss_ss0, GSEL(GDATA_SEL, SEL_KPL)); 1838 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 1839 private_tss = 0; 1840 PCPU_SET(tss_gdt, &gdt[GPROC0_SEL].sd); 1841 PCPU_SET(common_tssd, *PCPU_GET(tss_gdt)); 1842 PCPU_SET(common_tss.tss_ioopt, (sizeof (struct i386tss)) << 16); 1843 ltr(gsel_tss); 1844 1845 dblfault_tss.tss_esp = dblfault_tss.tss_esp0 = dblfault_tss.tss_esp1 = 1846 dblfault_tss.tss_esp2 = (int)&dblfault_stack[sizeof(dblfault_stack)]; 1847 dblfault_tss.tss_ss = dblfault_tss.tss_ss0 = dblfault_tss.tss_ss1 = 1848 dblfault_tss.tss_ss2 = GSEL(GDATA_SEL, SEL_KPL); 1849 dblfault_tss.tss_cr3 = (int)IdlePTD; 1850 dblfault_tss.tss_eip = (int)dblfault_handler; 1851 dblfault_tss.tss_eflags = PSL_KERNEL; 1852 dblfault_tss.tss_ds = dblfault_tss.tss_es = 1853 dblfault_tss.tss_gs = GSEL(GDATA_SEL, SEL_KPL); 1854 dblfault_tss.tss_fs = GSEL(GPRIV_SEL, SEL_KPL); 1855 dblfault_tss.tss_cs = GSEL(GCODE_SEL, SEL_KPL); 1856 dblfault_tss.tss_ldt = GSEL(GLDT_SEL, SEL_KPL); 1857 1858 vm86_initialize(); 1859 getmemsize(first); 1860 init_param2(physmem); 1861 1862 /* now running on new page tables, configured,and u/iom is accessible */ 1863 1864 /* Map the message buffer. */ 1865 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE) 1866 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off); 1867 1868 msgbufinit(msgbufp, MSGBUF_SIZE); 1869 1870 /* make a call gate to reenter kernel with */ 1871 gdp = &ldt[LSYS5CALLS_SEL].gd; 1872 1873 x = (int) &IDTVEC(lcall_syscall); 1874 gdp->gd_looffset = x; 1875 gdp->gd_selector = GSEL(GCODE_SEL,SEL_KPL); 1876 gdp->gd_stkcpy = 1; 1877 gdp->gd_type = SDT_SYS386CGT; 1878 gdp->gd_dpl = SEL_UPL; 1879 gdp->gd_p = 1; 1880 gdp->gd_hioffset = x >> 16; 1881 1882 /* XXX does this work? */ 1883 ldt[LBSDICALLS_SEL] = ldt[LSYS5CALLS_SEL]; 1884 ldt[LSOL26CALLS_SEL] = ldt[LSYS5CALLS_SEL]; 1885 1886 /* transfer to user mode */ 1887 1888 _ucodesel = LSEL(LUCODE_SEL, SEL_UPL); 1889 _udatasel = LSEL(LUDATA_SEL, SEL_UPL); 1890 1891 /* setup proc 0's pcb */ 1892 thread0.td_pcb->pcb_flags = 0; /* XXXKSE */ 1893 thread0.td_pcb->pcb_cr3 = (int)IdlePTD; 1894 thread0.td_pcb->pcb_ext = 0; 1895 thread0.td_frame = &proc0_tf; 1896} 1897 1898void 1899cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size) 1900{ 1901} 1902 1903#if defined(I586_CPU) && !defined(NO_F00F_HACK) 1904static void f00f_hack(void *unused); 1905SYSINIT(f00f_hack, SI_SUB_INTRINSIC, SI_ORDER_FIRST, f00f_hack, NULL); 1906 1907static void 1908f00f_hack(void *unused) { 1909 struct gate_descriptor *new_idt; 1910#ifndef SMP 1911 struct region_descriptor r_idt; 1912#endif 1913 vm_offset_t tmp; 1914 1915 if (!has_f00f_bug) 1916 return; 1917 1918 GIANT_REQUIRED; 1919 1920 printf("Intel Pentium detected, installing workaround for F00F bug\n"); 1921 1922 r_idt.rd_limit = sizeof(idt0) - 1; 1923 1924 tmp = kmem_alloc(kernel_map, PAGE_SIZE * 2); 1925 if (tmp == 0) 1926 panic("kmem_alloc returned 0"); 1927 if (((unsigned int)tmp & (PAGE_SIZE-1)) != 0) 1928 panic("kmem_alloc returned non-page-aligned memory"); 1929 /* Put the first seven entries in the lower page */ 1930 new_idt = (struct gate_descriptor*)(tmp + PAGE_SIZE - (7*8)); 1931 bcopy(idt, new_idt, sizeof(idt0)); 1932 r_idt.rd_base = (int)new_idt; 1933 lidt(&r_idt); 1934 idt = new_idt; 1935 if (vm_map_protect(kernel_map, tmp, tmp + PAGE_SIZE, 1936 VM_PROT_READ, FALSE) != KERN_SUCCESS) 1937 panic("vm_map_protect failed"); 1938 return; 1939} 1940#endif /* defined(I586_CPU) && !NO_F00F_HACK */ 1941 1942int 1943ptrace_set_pc(struct thread *td, unsigned long addr) 1944{ 1945 td->td_frame->tf_eip = addr; 1946 return (0); 1947} 1948 1949int 1950ptrace_single_step(struct thread *td) 1951{ 1952 td->td_frame->tf_eflags |= PSL_T; 1953 return (0); 1954} 1955 1956int 1957fill_regs(struct thread *td, struct reg *regs) 1958{ 1959 struct pcb *pcb; 1960 struct trapframe *tp; 1961 1962 tp = td->td_frame; 1963 regs->r_fs = tp->tf_fs; 1964 regs->r_es = tp->tf_es; 1965 regs->r_ds = tp->tf_ds; 1966 regs->r_edi = tp->tf_edi; 1967 regs->r_esi = tp->tf_esi; 1968 regs->r_ebp = tp->tf_ebp; 1969 regs->r_ebx = tp->tf_ebx; 1970 regs->r_edx = tp->tf_edx; 1971 regs->r_ecx = tp->tf_ecx; 1972 regs->r_eax = tp->tf_eax; 1973 regs->r_eip = tp->tf_eip; 1974 regs->r_cs = tp->tf_cs; 1975 regs->r_eflags = tp->tf_eflags; 1976 regs->r_esp = tp->tf_esp; 1977 regs->r_ss = tp->tf_ss; 1978 pcb = td->td_pcb; 1979 regs->r_gs = pcb->pcb_gs; 1980 return (0); 1981} 1982 1983int 1984set_regs(struct thread *td, struct reg *regs) 1985{ 1986 struct pcb *pcb; 1987 struct trapframe *tp; 1988 1989 tp = td->td_frame; 1990 if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) || 1991 !CS_SECURE(regs->r_cs)) 1992 return (EINVAL); 1993 tp->tf_fs = regs->r_fs; 1994 tp->tf_es = regs->r_es; 1995 tp->tf_ds = regs->r_ds; 1996 tp->tf_edi = regs->r_edi; 1997 tp->tf_esi = regs->r_esi; 1998 tp->tf_ebp = regs->r_ebp; 1999 tp->tf_ebx = regs->r_ebx; 2000 tp->tf_edx = regs->r_edx; 2001 tp->tf_ecx = regs->r_ecx; 2002 tp->tf_eax = regs->r_eax; 2003 tp->tf_eip = regs->r_eip; 2004 tp->tf_cs = regs->r_cs; 2005 tp->tf_eflags = regs->r_eflags; 2006 tp->tf_esp = regs->r_esp; 2007 tp->tf_ss = regs->r_ss; 2008 pcb = td->td_pcb; 2009 pcb->pcb_gs = regs->r_gs; 2010 return (0); 2011} 2012 2013#ifdef CPU_ENABLE_SSE 2014static void 2015fill_fpregs_xmm(sv_xmm, sv_87) 2016 struct savexmm *sv_xmm; 2017 struct save87 *sv_87; 2018{ 2019 register struct env87 *penv_87 = &sv_87->sv_env; 2020 register struct envxmm *penv_xmm = &sv_xmm->sv_env; 2021 int i; 2022 2023 /* FPU control/status */ 2024 penv_87->en_cw = penv_xmm->en_cw; 2025 penv_87->en_sw = penv_xmm->en_sw; 2026 penv_87->en_tw = penv_xmm->en_tw; 2027 penv_87->en_fip = penv_xmm->en_fip; 2028 penv_87->en_fcs = penv_xmm->en_fcs; 2029 penv_87->en_opcode = penv_xmm->en_opcode; 2030 penv_87->en_foo = penv_xmm->en_foo; 2031 penv_87->en_fos = penv_xmm->en_fos; 2032 2033 /* FPU registers */ 2034 for (i = 0; i < 8; ++i) 2035 sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc; 2036 2037 sv_87->sv_ex_sw = sv_xmm->sv_ex_sw; 2038} 2039 2040static void 2041set_fpregs_xmm(sv_87, sv_xmm) 2042 struct save87 *sv_87; 2043 struct savexmm *sv_xmm; 2044{ 2045 register struct env87 *penv_87 = &sv_87->sv_env; 2046 register struct envxmm *penv_xmm = &sv_xmm->sv_env; 2047 int i; 2048 2049 /* FPU control/status */ 2050 penv_xmm->en_cw = penv_87->en_cw; 2051 penv_xmm->en_sw = penv_87->en_sw; 2052 penv_xmm->en_tw = penv_87->en_tw; 2053 penv_xmm->en_fip = penv_87->en_fip; 2054 penv_xmm->en_fcs = penv_87->en_fcs; 2055 penv_xmm->en_opcode = penv_87->en_opcode; 2056 penv_xmm->en_foo = penv_87->en_foo; 2057 penv_xmm->en_fos = penv_87->en_fos; 2058 2059 /* FPU registers */ 2060 for (i = 0; i < 8; ++i) 2061 sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i]; 2062 2063 sv_xmm->sv_ex_sw = sv_87->sv_ex_sw; 2064} 2065#endif /* CPU_ENABLE_SSE */ 2066 2067int 2068fill_fpregs(struct thread *td, struct fpreg *fpregs) 2069{ 2070#ifdef CPU_ENABLE_SSE 2071 if (cpu_fxsr) { 2072 fill_fpregs_xmm(&td->td_pcb->pcb_save.sv_xmm, 2073 (struct save87 *)fpregs); 2074 return (0); 2075 } 2076#endif /* CPU_ENABLE_SSE */ 2077 bcopy(&td->td_pcb->pcb_save.sv_87, fpregs, sizeof *fpregs); 2078 return (0); 2079} 2080 2081int 2082set_fpregs(struct thread *td, struct fpreg *fpregs) 2083{ 2084#ifdef CPU_ENABLE_SSE 2085 if (cpu_fxsr) { 2086 set_fpregs_xmm((struct save87 *)fpregs, 2087 &td->td_pcb->pcb_save.sv_xmm); 2088 return (0); 2089 } 2090#endif /* CPU_ENABLE_SSE */ 2091 bcopy(fpregs, &td->td_pcb->pcb_save.sv_87, sizeof *fpregs); 2092 return (0); 2093} 2094 2095int 2096fill_dbregs(struct thread *td, struct dbreg *dbregs) 2097{ 2098 struct pcb *pcb; 2099 2100 if (td == NULL) { 2101 dbregs->dr0 = rdr0(); 2102 dbregs->dr1 = rdr1(); 2103 dbregs->dr2 = rdr2(); 2104 dbregs->dr3 = rdr3(); 2105 dbregs->dr4 = rdr4(); 2106 dbregs->dr5 = rdr5(); 2107 dbregs->dr6 = rdr6(); 2108 dbregs->dr7 = rdr7(); 2109 } else { 2110 pcb = td->td_pcb; 2111 dbregs->dr0 = pcb->pcb_dr0; 2112 dbregs->dr1 = pcb->pcb_dr1; 2113 dbregs->dr2 = pcb->pcb_dr2; 2114 dbregs->dr3 = pcb->pcb_dr3; 2115 dbregs->dr4 = 0; 2116 dbregs->dr5 = 0; 2117 dbregs->dr6 = pcb->pcb_dr6; 2118 dbregs->dr7 = pcb->pcb_dr7; 2119 } 2120 return (0); 2121} 2122 2123int 2124set_dbregs(struct thread *td, struct dbreg *dbregs) 2125{ 2126 struct pcb *pcb; 2127 int i; 2128 u_int32_t mask1, mask2; 2129 2130 if (td == NULL) { 2131 load_dr0(dbregs->dr0); 2132 load_dr1(dbregs->dr1); 2133 load_dr2(dbregs->dr2); 2134 load_dr3(dbregs->dr3); 2135 load_dr4(dbregs->dr4); 2136 load_dr5(dbregs->dr5); 2137 load_dr6(dbregs->dr6); 2138 load_dr7(dbregs->dr7); 2139 } else { 2140 /* 2141 * Don't let an illegal value for dr7 get set. Specifically, 2142 * check for undefined settings. Setting these bit patterns 2143 * result in undefined behaviour and can lead to an unexpected 2144 * TRCTRAP. 2145 */ 2146 for (i = 0, mask1 = 0x3<<16, mask2 = 0x2<<16; i < 8; 2147 i++, mask1 <<= 2, mask2 <<= 2) 2148 if ((dbregs->dr7 & mask1) == mask2) 2149 return (EINVAL); 2150 2151 pcb = td->td_pcb; 2152 2153 /* 2154 * Don't let a process set a breakpoint that is not within the 2155 * process's address space. If a process could do this, it 2156 * could halt the system by setting a breakpoint in the kernel 2157 * (if ddb was enabled). Thus, we need to check to make sure 2158 * that no breakpoints are being enabled for addresses outside 2159 * process's address space, unless, perhaps, we were called by 2160 * uid 0. 2161 * 2162 * XXX - what about when the watched area of the user's 2163 * address space is written into from within the kernel 2164 * ... wouldn't that still cause a breakpoint to be generated 2165 * from within kernel mode? 2166 */ 2167 2168 if (suser_td(td) != 0) { 2169 if (dbregs->dr7 & 0x3) { 2170 /* dr0 is enabled */ 2171 if (dbregs->dr0 >= VM_MAXUSER_ADDRESS) 2172 return (EINVAL); 2173 } 2174 2175 if (dbregs->dr7 & (0x3<<2)) { 2176 /* dr1 is enabled */ 2177 if (dbregs->dr1 >= VM_MAXUSER_ADDRESS) 2178 return (EINVAL); 2179 } 2180 2181 if (dbregs->dr7 & (0x3<<4)) { 2182 /* dr2 is enabled */ 2183 if (dbregs->dr2 >= VM_MAXUSER_ADDRESS) 2184 return (EINVAL); 2185 } 2186 2187 if (dbregs->dr7 & (0x3<<6)) { 2188 /* dr3 is enabled */ 2189 if (dbregs->dr3 >= VM_MAXUSER_ADDRESS) 2190 return (EINVAL); 2191 } 2192 } 2193 2194 pcb->pcb_dr0 = dbregs->dr0; 2195 pcb->pcb_dr1 = dbregs->dr1; 2196 pcb->pcb_dr2 = dbregs->dr2; 2197 pcb->pcb_dr3 = dbregs->dr3; 2198 pcb->pcb_dr6 = dbregs->dr6; 2199 pcb->pcb_dr7 = dbregs->dr7; 2200 2201 pcb->pcb_flags |= PCB_DBREGS; 2202 } 2203 2204 return (0); 2205} 2206 2207/* 2208 * Return > 0 if a hardware breakpoint has been hit, and the 2209 * breakpoint was in user space. Return 0, otherwise. 2210 */ 2211int 2212user_dbreg_trap(void) 2213{ 2214 u_int32_t dr7, dr6; /* debug registers dr6 and dr7 */ 2215 u_int32_t bp; /* breakpoint bits extracted from dr6 */ 2216 int nbp; /* number of breakpoints that triggered */ 2217 caddr_t addr[4]; /* breakpoint addresses */ 2218 int i; 2219 2220 dr7 = rdr7(); 2221 if ((dr7 & 0x000000ff) == 0) { 2222 /* 2223 * all GE and LE bits in the dr7 register are zero, 2224 * thus the trap couldn't have been caused by the 2225 * hardware debug registers 2226 */ 2227 return 0; 2228 } 2229 2230 nbp = 0; 2231 dr6 = rdr6(); 2232 bp = dr6 & 0x0000000f; 2233 2234 if (!bp) { 2235 /* 2236 * None of the breakpoint bits are set meaning this 2237 * trap was not caused by any of the debug registers 2238 */ 2239 return 0; 2240 } 2241 2242 /* 2243 * at least one of the breakpoints were hit, check to see 2244 * which ones and if any of them are user space addresses 2245 */ 2246 2247 if (bp & 0x01) { 2248 addr[nbp++] = (caddr_t)rdr0(); 2249 } 2250 if (bp & 0x02) { 2251 addr[nbp++] = (caddr_t)rdr1(); 2252 } 2253 if (bp & 0x04) { 2254 addr[nbp++] = (caddr_t)rdr2(); 2255 } 2256 if (bp & 0x08) { 2257 addr[nbp++] = (caddr_t)rdr3(); 2258 } 2259 2260 for (i=0; i<nbp; i++) { 2261 if (addr[i] < 2262 (caddr_t)VM_MAXUSER_ADDRESS) { 2263 /* 2264 * addr[i] is in user space 2265 */ 2266 return nbp; 2267 } 2268 } 2269 2270 /* 2271 * None of the breakpoints are in user space. 2272 */ 2273 return 0; 2274} 2275 2276 2277#ifndef DDB 2278void 2279Debugger(const char *msg) 2280{ 2281 printf("Debugger(\"%s\") called.\n", msg); 2282} 2283#endif /* no DDB */ 2284 2285#include <sys/disklabel.h> 2286 2287/* 2288 * Determine the size of the transfer, and make sure it is 2289 * within the boundaries of the partition. Adjust transfer 2290 * if needed, and signal errors or early completion. 2291 */ 2292int 2293bounds_check_with_label(struct bio *bp, struct disklabel *lp, int wlabel) 2294{ 2295 struct partition *p = lp->d_partitions + dkpart(bp->bio_dev); 2296 int labelsect = lp->d_partitions[0].p_offset; 2297 int maxsz = p->p_size, 2298 sz = (bp->bio_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT; 2299 2300 /* overwriting disk label ? */ 2301 /* XXX should also protect bootstrap in first 8K */ 2302 if (bp->bio_blkno + p->p_offset <= LABELSECTOR + labelsect && 2303#if LABELSECTOR != 0 2304 bp->bio_blkno + p->p_offset + sz > LABELSECTOR + labelsect && 2305#endif 2306 (bp->bio_cmd == BIO_WRITE) && wlabel == 0) { 2307 bp->bio_error = EROFS; 2308 goto bad; 2309 } 2310 2311#if defined(DOSBBSECTOR) && defined(notyet) 2312 /* overwriting master boot record? */ 2313 if (bp->bio_blkno + p->p_offset <= DOSBBSECTOR && 2314 (bp->bio_cmd == BIO_WRITE) && wlabel == 0) { 2315 bp->bio_error = EROFS; 2316 goto bad; 2317 } 2318#endif 2319 2320 /* beyond partition? */ 2321 if (bp->bio_blkno < 0 || bp->bio_blkno + sz > maxsz) { 2322 /* if exactly at end of disk, return an EOF */ 2323 if (bp->bio_blkno == maxsz) { 2324 bp->bio_resid = bp->bio_bcount; 2325 return(0); 2326 } 2327 /* or truncate if part of it fits */ 2328 sz = maxsz - bp->bio_blkno; 2329 if (sz <= 0) { 2330 bp->bio_error = EINVAL; 2331 goto bad; 2332 } 2333 bp->bio_bcount = sz << DEV_BSHIFT; 2334 } 2335 2336 bp->bio_pblkno = bp->bio_blkno + p->p_offset; 2337 return(1); 2338 2339bad: 2340 bp->bio_flags |= BIO_ERROR; 2341 return(-1); 2342} 2343 2344#ifdef DDB 2345 2346/* 2347 * Provide inb() and outb() as functions. They are normally only 2348 * available as macros calling inlined functions, thus cannot be 2349 * called inside DDB. 2350 * 2351 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined. 2352 */ 2353 2354#undef inb 2355#undef outb 2356 2357/* silence compiler warnings */ 2358u_char inb(u_int); 2359void outb(u_int, u_char); 2360 2361u_char 2362inb(u_int port) 2363{ 2364 u_char data; 2365 /* 2366 * We use %%dx and not %1 here because i/o is done at %dx and not at 2367 * %edx, while gcc generates inferior code (movw instead of movl) 2368 * if we tell it to load (u_short) port. 2369 */ 2370 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 2371 return (data); 2372} 2373 2374void 2375outb(u_int port, u_char data) 2376{ 2377 u_char al; 2378 /* 2379 * Use an unnecessary assignment to help gcc's register allocator. 2380 * This make a large difference for gcc-1.40 and a tiny difference 2381 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for 2382 * best results. gcc-2.6.0 can't handle this. 2383 */ 2384 al = data; 2385 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 2386} 2387 2388#endif /* DDB */ 2389