machdep.c revision 182865
1/*- 2 * Copyright (c) 2003 Peter Wemm. 3 * Copyright (c) 1992 Terrence R. Lambert. 4 * Copyright (c) 1982, 1987, 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * William Jolitz. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * from: @(#)machdep.c 7.4 (Berkeley) 6/3/91 39 */ 40 41#include <sys/cdefs.h> 42__FBSDID("$FreeBSD: head/sys/amd64/amd64/machdep.c 182865 2008-09-08 08:58:29Z kib $"); 43 44#include "opt_atalk.h" 45#include "opt_atpic.h" 46#include "opt_compat.h" 47#include "opt_cpu.h" 48#include "opt_ddb.h" 49#include "opt_inet.h" 50#include "opt_ipx.h" 51#include "opt_isa.h" 52#include "opt_kstack_pages.h" 53#include "opt_maxmem.h" 54#include "opt_msgbuf.h" 55#include "opt_perfmon.h" 56#include "opt_sched.h" 57 58#include <sys/param.h> 59#include <sys/proc.h> 60#include <sys/systm.h> 61#include <sys/bio.h> 62#include <sys/buf.h> 63#include <sys/bus.h> 64#include <sys/callout.h> 65#include <sys/cons.h> 66#include <sys/cpu.h> 67#include <sys/eventhandler.h> 68#include <sys/exec.h> 69#include <sys/imgact.h> 70#include <sys/kdb.h> 71#include <sys/kernel.h> 72#include <sys/ktr.h> 73#include <sys/linker.h> 74#include <sys/lock.h> 75#include <sys/malloc.h> 76#include <sys/memrange.h> 77#include <sys/msgbuf.h> 78#include <sys/mutex.h> 79#include <sys/pcpu.h> 80#include <sys/ptrace.h> 81#include <sys/reboot.h> 82#include <sys/sched.h> 83#include <sys/signalvar.h> 84#include <sys/sysctl.h> 85#include <sys/sysent.h> 86#include <sys/sysproto.h> 87#include <sys/ucontext.h> 88#include <sys/vmmeter.h> 89 90#include <vm/vm.h> 91#include <vm/vm_extern.h> 92#include <vm/vm_kern.h> 93#include <vm/vm_page.h> 94#include <vm/vm_map.h> 95#include <vm/vm_object.h> 96#include <vm/vm_pager.h> 97#include <vm/vm_param.h> 98 99#ifdef DDB 100#ifndef KDB 101#error KDB must be enabled in order for DDB to work! 102#endif 103#endif 104#include <ddb/ddb.h> 105 106#include <net/netisr.h> 107 108#include <machine/clock.h> 109#include <machine/cpu.h> 110#include <machine/cputypes.h> 111#include <machine/intr_machdep.h> 112#include <machine/md_var.h> 113#include <machine/metadata.h> 114#include <machine/pc/bios.h> 115#include <machine/pcb.h> 116#include <machine/proc.h> 117#include <machine/reg.h> 118#include <machine/sigframe.h> 119#include <machine/specialreg.h> 120#ifdef PERFMON 121#include <machine/perfmon.h> 122#endif 123#include <machine/tss.h> 124#ifdef SMP 125#include <machine/smp.h> 126#endif 127 128#ifdef DEV_ATPIC 129#include <amd64/isa/icu.h> 130#else 131#include <machine/apicvar.h> 132#endif 133 134#include <isa/isareg.h> 135#include <isa/rtc.h> 136 137/* Sanity check for __curthread() */ 138CTASSERT(offsetof(struct pcpu, pc_curthread) == 0); 139 140extern u_int64_t hammer_time(u_int64_t, u_int64_t); 141 142extern void printcpuinfo(void); /* XXX header file */ 143extern void identify_cpu(void); 144extern void panicifcpuunsupported(void); 145 146#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 147#define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 148 149static void cpu_startup(void *); 150static void get_fpcontext(struct thread *td, mcontext_t *mcp); 151static int set_fpcontext(struct thread *td, const mcontext_t *mcp); 152SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL); 153 154#ifdef DDB 155extern vm_offset_t ksym_start, ksym_end; 156#endif 157 158/* Intel ICH registers */ 159#define ICH_PMBASE 0x400 160#define ICH_SMI_EN ICH_PMBASE + 0x30 161 162int _udatasel, _ucodesel, _ucode32sel; 163 164int cold = 1; 165 166long Maxmem = 0; 167long realmem = 0; 168 169/* 170 * The number of PHYSMAP entries must be one less than the number of 171 * PHYSSEG entries because the PHYSMAP entry that spans the largest 172 * physical address that is accessible by ISA DMA is split into two 173 * PHYSSEG entries. 174 */ 175#define PHYSMAP_SIZE (2 * (VM_PHYSSEG_MAX - 1)) 176 177vm_paddr_t phys_avail[PHYSMAP_SIZE + 2]; 178vm_paddr_t dump_avail[PHYSMAP_SIZE + 2]; 179 180/* must be 2 less so 0 0 can signal end of chunks */ 181#define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(phys_avail[0])) - 2) 182#define DUMP_AVAIL_ARRAY_END ((sizeof(dump_avail) / sizeof(dump_avail[0])) - 2) 183 184struct kva_md_info kmi; 185 186static struct trapframe proc0_tf; 187struct region_descriptor r_gdt, r_idt; 188 189struct pcpu __pcpu[MAXCPU]; 190 191struct mtx icu_lock; 192 193struct mem_range_softc mem_range_softc; 194 195static void 196cpu_startup(dummy) 197 void *dummy; 198{ 199 char *sysenv; 200 201 /* 202 * On MacBooks, we need to disallow the legacy USB circuit to 203 * generate an SMI# because this can cause several problems, 204 * namely: incorrect CPU frequency detection and failure to 205 * start the APs. 206 * We do this by disabling a bit in the SMI_EN (SMI Control and 207 * Enable register) of the Intel ICH LPC Interface Bridge. 208 */ 209 sysenv = getenv("smbios.system.product"); 210 if (sysenv != NULL) { 211 if (strncmp(sysenv, "MacBook", 7) == 0) { 212 if (bootverbose) 213 printf("Disabling LEGACY_USB_EN bit on " 214 "Intel ICH.\n"); 215 outl(ICH_SMI_EN, inl(ICH_SMI_EN) & ~0x8); 216 } 217 freeenv(sysenv); 218 } 219 220 /* 221 * Good {morning,afternoon,evening,night}. 222 */ 223 startrtclock(); 224 printcpuinfo(); 225 panicifcpuunsupported(); 226#ifdef PERFMON 227 perfmon_init(); 228#endif 229 printf("usable memory = %ju (%ju MB)\n", ptoa((uintmax_t)physmem), 230 ptoa((uintmax_t)physmem) / 1048576); 231 realmem = Maxmem; 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 vm_paddr_t size; 241 242 size = phys_avail[indx + 1] - phys_avail[indx]; 243 printf( 244 "0x%016jx - 0x%016jx, %ju bytes (%ju pages)\n", 245 (uintmax_t)phys_avail[indx], 246 (uintmax_t)phys_avail[indx + 1] - 1, 247 (uintmax_t)size, (uintmax_t)size / PAGE_SIZE); 248 } 249 } 250 251 vm_ksubmap_init(&kmi); 252 253 printf("avail memory = %ju (%ju MB)\n", 254 ptoa((uintmax_t)cnt.v_free_count), 255 ptoa((uintmax_t)cnt.v_free_count) / 1048576); 256 257 /* 258 * Set up buffers, so they can be used to read disk labels. 259 */ 260 bufinit(); 261 vm_pager_bufferinit(); 262 263 cpu_setregs(); 264} 265 266/* 267 * Send an interrupt to process. 268 * 269 * Stack is set up to allow sigcode stored 270 * at top to call routine, followed by kcall 271 * to sigreturn routine below. After sigreturn 272 * resets the signal mask, the stack, and the 273 * frame pointer, it returns to the user 274 * specified pc, psl. 275 */ 276void 277sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 278{ 279 struct sigframe sf, *sfp; 280 struct proc *p; 281 struct thread *td; 282 struct sigacts *psp; 283 char *sp; 284 struct trapframe *regs; 285 int sig; 286 int oonstack; 287 288 td = curthread; 289 p = td->td_proc; 290 PROC_LOCK_ASSERT(p, MA_OWNED); 291 sig = ksi->ksi_signo; 292 psp = p->p_sigacts; 293 mtx_assert(&psp->ps_mtx, MA_OWNED); 294 regs = td->td_frame; 295 oonstack = sigonstack(regs->tf_rsp); 296 297 /* Save user context. */ 298 bzero(&sf, sizeof(sf)); 299 sf.sf_uc.uc_sigmask = *mask; 300 sf.sf_uc.uc_stack = td->td_sigstk; 301 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 302 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE; 303 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0; 304 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_rdi, sizeof(*regs)); 305 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */ 306 get_fpcontext(td, &sf.sf_uc.uc_mcontext); 307 fpstate_drop(td); 308 309 /* Allocate space for the signal handler context. */ 310 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack && 311 SIGISMEMBER(psp->ps_sigonstack, sig)) { 312 sp = td->td_sigstk.ss_sp + 313 td->td_sigstk.ss_size - sizeof(struct sigframe); 314#if defined(COMPAT_43) 315 td->td_sigstk.ss_flags |= SS_ONSTACK; 316#endif 317 } else 318 sp = (char *)regs->tf_rsp - sizeof(struct sigframe) - 128; 319 /* Align to 16 bytes. */ 320 sfp = (struct sigframe *)((unsigned long)sp & ~0xFul); 321 322 /* Translate the signal if appropriate. */ 323 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize) 324 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 325 326 /* Build the argument list for the signal handler. */ 327 regs->tf_rdi = sig; /* arg 1 in %rdi */ 328 regs->tf_rdx = (register_t)&sfp->sf_uc; /* arg 3 in %rdx */ 329 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 330 /* Signal handler installed with SA_SIGINFO. */ 331 regs->tf_rsi = (register_t)&sfp->sf_si; /* arg 2 in %rsi */ 332 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher; 333 334 /* Fill in POSIX parts */ 335 sf.sf_si = ksi->ksi_info; 336 sf.sf_si.si_signo = sig; /* maybe a translated signal */ 337 regs->tf_rcx = (register_t)ksi->ksi_addr; /* arg 4 in %rcx */ 338 } else { 339 /* Old FreeBSD-style arguments. */ 340 regs->tf_rsi = ksi->ksi_code; /* arg 2 in %rsi */ 341 regs->tf_rcx = (register_t)ksi->ksi_addr; /* arg 4 in %rcx */ 342 sf.sf_ahu.sf_handler = catcher; 343 } 344 mtx_unlock(&psp->ps_mtx); 345 PROC_UNLOCK(p); 346 347 /* 348 * Copy the sigframe out to the user's stack. 349 */ 350 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) { 351#ifdef DEBUG 352 printf("process %ld has trashed its stack\n", (long)p->p_pid); 353#endif 354 PROC_LOCK(p); 355 sigexit(td, SIGILL); 356 } 357 358 regs->tf_rsp = (long)sfp; 359 regs->tf_rip = PS_STRINGS - *(p->p_sysent->sv_szsigcode); 360 regs->tf_rflags &= ~(PSL_T | PSL_D); 361 regs->tf_cs = _ucodesel; 362 PROC_LOCK(p); 363 mtx_lock(&psp->ps_mtx); 364} 365 366/* 367 * System call to cleanup state after a signal 368 * has been taken. Reset signal mask and 369 * stack state from context left by sendsig (above). 370 * Return to previous pc and psl as specified by 371 * context left by sendsig. Check carefully to 372 * make sure that the user has not modified the 373 * state to gain improper privileges. 374 * 375 * MPSAFE 376 */ 377int 378sigreturn(td, uap) 379 struct thread *td; 380 struct sigreturn_args /* { 381 const struct __ucontext *sigcntxp; 382 } */ *uap; 383{ 384 ucontext_t uc; 385 struct proc *p = td->td_proc; 386 struct trapframe *regs; 387 const ucontext_t *ucp; 388 long rflags; 389 int cs, error, ret; 390 ksiginfo_t ksi; 391 392 error = copyin(uap->sigcntxp, &uc, sizeof(uc)); 393 if (error != 0) 394 return (error); 395 ucp = &uc; 396 regs = td->td_frame; 397 rflags = ucp->uc_mcontext.mc_rflags; 398 /* 399 * Don't allow users to change privileged or reserved flags. 400 */ 401 /* 402 * XXX do allow users to change the privileged flag PSL_RF. 403 * The cpu sets PSL_RF in tf_rflags for faults. Debuggers 404 * should sometimes set it there too. tf_rflags is kept in 405 * the signal context during signal handling and there is no 406 * other place to remember it, so the PSL_RF bit may be 407 * corrupted by the signal handler without us knowing. 408 * Corruption of the PSL_RF bit at worst causes one more or 409 * one less debugger trap, so allowing it is fairly harmless. 410 */ 411 if (!EFL_SECURE(rflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) { 412 printf("sigreturn: rflags = 0x%lx\n", rflags); 413 return (EINVAL); 414 } 415 416 /* 417 * Don't allow users to load a valid privileged %cs. Let the 418 * hardware check for invalid selectors, excess privilege in 419 * other selectors, invalid %eip's and invalid %esp's. 420 */ 421 cs = ucp->uc_mcontext.mc_cs; 422 if (!CS_SECURE(cs)) { 423 printf("sigreturn: cs = 0x%x\n", cs); 424 ksiginfo_init_trap(&ksi); 425 ksi.ksi_signo = SIGBUS; 426 ksi.ksi_code = BUS_OBJERR; 427 ksi.ksi_trapno = T_PROTFLT; 428 ksi.ksi_addr = (void *)regs->tf_rip; 429 trapsignal(td, &ksi); 430 return (EINVAL); 431 } 432 433 ret = set_fpcontext(td, &ucp->uc_mcontext); 434 if (ret != 0) 435 return (ret); 436 bcopy(&ucp->uc_mcontext.mc_rdi, regs, sizeof(*regs)); 437 438 PROC_LOCK(p); 439#if defined(COMPAT_43) 440 if (ucp->uc_mcontext.mc_onstack & 1) 441 td->td_sigstk.ss_flags |= SS_ONSTACK; 442 else 443 td->td_sigstk.ss_flags &= ~SS_ONSTACK; 444#endif 445 446 td->td_sigmask = ucp->uc_sigmask; 447 SIG_CANTMASK(td->td_sigmask); 448 signotify(td); 449 PROC_UNLOCK(p); 450 td->td_pcb->pcb_flags |= PCB_FULLCTX; 451 return (EJUSTRETURN); 452} 453 454#ifdef COMPAT_FREEBSD4 455int 456freebsd4_sigreturn(struct thread *td, struct freebsd4_sigreturn_args *uap) 457{ 458 459 return sigreturn(td, (struct sigreturn_args *)uap); 460} 461#endif 462 463 464/* 465 * Machine dependent boot() routine 466 * 467 * I haven't seen anything to put here yet 468 * Possibly some stuff might be grafted back here from boot() 469 */ 470void 471cpu_boot(int howto) 472{ 473} 474 475/* Get current clock frequency for the given cpu id. */ 476int 477cpu_est_clockrate(int cpu_id, uint64_t *rate) 478{ 479 register_t reg; 480 uint64_t tsc1, tsc2; 481 482 if (pcpu_find(cpu_id) == NULL || rate == NULL) 483 return (EINVAL); 484 485 /* If we're booting, trust the rate calibrated moments ago. */ 486 if (cold) { 487 *rate = tsc_freq; 488 return (0); 489 } 490 491#ifdef SMP 492 /* Schedule ourselves on the indicated cpu. */ 493 thread_lock(curthread); 494 sched_bind(curthread, cpu_id); 495 thread_unlock(curthread); 496#endif 497 498 /* Calibrate by measuring a short delay. */ 499 reg = intr_disable(); 500 tsc1 = rdtsc(); 501 DELAY(1000); 502 tsc2 = rdtsc(); 503 intr_restore(reg); 504 505#ifdef SMP 506 thread_lock(curthread); 507 sched_unbind(curthread); 508 thread_unlock(curthread); 509#endif 510 511 /* 512 * Calculate the difference in readings, convert to Mhz, and 513 * subtract 0.5% of the total. Empirical testing has shown that 514 * overhead in DELAY() works out to approximately this value. 515 */ 516 tsc2 -= tsc1; 517 *rate = tsc2 * 1000 - tsc2 * 5; 518 return (0); 519} 520 521/* 522 * Shutdown the CPU as much as possible 523 */ 524void 525cpu_halt(void) 526{ 527 for (;;) 528 __asm__ ("hlt"); 529} 530 531void (*cpu_idle_hook)(void) = NULL; /* ACPI idle hook. */ 532 533static void 534cpu_idle_hlt(int busy) 535{ 536 /* 537 * we must absolutely guarentee that hlt is the next instruction 538 * after sti or we introduce a timing window. 539 */ 540 disable_intr(); 541 if (sched_runnable()) 542 enable_intr(); 543 else 544 __asm __volatile("sti; hlt"); 545} 546 547static void 548cpu_idle_acpi(int busy) 549{ 550 disable_intr(); 551 if (sched_runnable()) 552 enable_intr(); 553 else if (cpu_idle_hook) 554 cpu_idle_hook(); 555 else 556 __asm __volatile("sti; hlt"); 557} 558 559static void 560cpu_idle_spin(int busy) 561{ 562 return; 563} 564 565void (*cpu_idle_fn)(int) = cpu_idle_acpi; 566 567void 568cpu_idle(int busy) 569{ 570#ifdef SMP 571 if (mp_grab_cpu_hlt()) 572 return; 573#endif 574 cpu_idle_fn(busy); 575} 576 577/* 578 * mwait cpu power states. Lower 4 bits are sub-states. 579 */ 580#define MWAIT_C0 0xf0 581#define MWAIT_C1 0x00 582#define MWAIT_C2 0x10 583#define MWAIT_C3 0x20 584#define MWAIT_C4 0x30 585 586#define MWAIT_DISABLED 0x0 587#define MWAIT_WOKEN 0x1 588#define MWAIT_WAITING 0x2 589 590static void 591cpu_idle_mwait(int busy) 592{ 593 int *mwait; 594 595 mwait = (int *)PCPU_PTR(monitorbuf); 596 *mwait = MWAIT_WAITING; 597 if (sched_runnable()) 598 return; 599 cpu_monitor(mwait, 0, 0); 600 if (*mwait == MWAIT_WAITING) 601 cpu_mwait(0, MWAIT_C1); 602} 603 604static void 605cpu_idle_mwait_hlt(int busy) 606{ 607 int *mwait; 608 609 mwait = (int *)PCPU_PTR(monitorbuf); 610 if (busy == 0) { 611 *mwait = MWAIT_DISABLED; 612 cpu_idle_hlt(busy); 613 return; 614 } 615 *mwait = MWAIT_WAITING; 616 if (sched_runnable()) 617 return; 618 cpu_monitor(mwait, 0, 0); 619 if (*mwait == MWAIT_WAITING) 620 cpu_mwait(0, MWAIT_C1); 621} 622 623int 624cpu_idle_wakeup(int cpu) 625{ 626 struct pcpu *pcpu; 627 int *mwait; 628 629 if (cpu_idle_fn == cpu_idle_spin) 630 return (1); 631 if (cpu_idle_fn != cpu_idle_mwait && cpu_idle_fn != cpu_idle_mwait_hlt) 632 return (0); 633 pcpu = pcpu_find(cpu); 634 mwait = (int *)pcpu->pc_monitorbuf; 635 /* 636 * This doesn't need to be atomic since missing the race will 637 * simply result in unnecessary IPIs. 638 */ 639 if (cpu_idle_fn == cpu_idle_mwait_hlt && *mwait == MWAIT_DISABLED) 640 return (0); 641 *mwait = MWAIT_WOKEN; 642 643 return (1); 644} 645 646/* 647 * Ordered by speed/power consumption. 648 */ 649struct { 650 void *id_fn; 651 char *id_name; 652} idle_tbl[] = { 653 { cpu_idle_spin, "spin" }, 654 { cpu_idle_mwait, "mwait" }, 655 { cpu_idle_mwait_hlt, "mwait_hlt" }, 656 { cpu_idle_hlt, "hlt" }, 657 { cpu_idle_acpi, "acpi" }, 658 { NULL, NULL } 659}; 660 661static int 662idle_sysctl_available(SYSCTL_HANDLER_ARGS) 663{ 664 char *avail, *p; 665 int error; 666 int i; 667 668 avail = malloc(256, M_TEMP, M_WAITOK); 669 p = avail; 670 for (i = 0; idle_tbl[i].id_name != NULL; i++) { 671 if (strstr(idle_tbl[i].id_name, "mwait") && 672 (cpu_feature2 & CPUID2_MON) == 0) 673 continue; 674 p += sprintf(p, "%s, ", idle_tbl[i].id_name); 675 } 676 error = sysctl_handle_string(oidp, avail, 0, req); 677 free(avail, M_TEMP); 678 return (error); 679} 680 681static int 682idle_sysctl(SYSCTL_HANDLER_ARGS) 683{ 684 char buf[16]; 685 int error; 686 char *p; 687 int i; 688 689 p = "unknown"; 690 for (i = 0; idle_tbl[i].id_name != NULL; i++) { 691 if (idle_tbl[i].id_fn == cpu_idle_fn) { 692 p = idle_tbl[i].id_name; 693 break; 694 } 695 } 696 strncpy(buf, p, sizeof(buf)); 697 error = sysctl_handle_string(oidp, buf, sizeof(buf), req); 698 if (error != 0 || req->newptr == NULL) 699 return (error); 700 for (i = 0; idle_tbl[i].id_name != NULL; i++) { 701 if (strstr(idle_tbl[i].id_name, "mwait") && 702 (cpu_feature2 & CPUID2_MON) == 0) 703 continue; 704 if (strcmp(idle_tbl[i].id_name, buf)) 705 continue; 706 cpu_idle_fn = idle_tbl[i].id_fn; 707 return (0); 708 } 709 return (EINVAL); 710} 711 712SYSCTL_PROC(_machdep, OID_AUTO, idle_available, CTLTYPE_STRING | CTLFLAG_RD, 713 0, 0, idle_sysctl_available, "A", "list of available idle functions"); 714 715SYSCTL_PROC(_machdep, OID_AUTO, idle, CTLTYPE_STRING | CTLFLAG_RW, 0, 0, 716 idle_sysctl, "A", "currently selected idle function"); 717 718/* 719 * Clear registers on exec 720 */ 721void 722exec_setregs(td, entry, stack, ps_strings) 723 struct thread *td; 724 u_long entry; 725 u_long stack; 726 u_long ps_strings; 727{ 728 struct trapframe *regs = td->td_frame; 729 struct pcb *pcb = td->td_pcb; 730 731 critical_enter(); 732 wrmsr(MSR_FSBASE, 0); 733 wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */ 734 pcb->pcb_fsbase = 0; 735 pcb->pcb_gsbase = 0; 736 critical_exit(); 737 pcb->pcb_flags &= ~(PCB_32BIT | PCB_GS32BIT); 738 load_ds(_udatasel); 739 load_es(_udatasel); 740 load_fs(_udatasel); 741 load_gs(_udatasel); 742 pcb->pcb_ds = _udatasel; 743 pcb->pcb_es = _udatasel; 744 pcb->pcb_fs = _udatasel; 745 pcb->pcb_gs = _udatasel; 746 747 bzero((char *)regs, sizeof(struct trapframe)); 748 regs->tf_rip = entry; 749 regs->tf_rsp = ((stack - 8) & ~0xFul) + 8; 750 regs->tf_rdi = stack; /* argv */ 751 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T); 752 regs->tf_ss = _udatasel; 753 regs->tf_cs = _ucodesel; 754 755 /* 756 * Reset the hardware debug registers if they were in use. 757 * They won't have any meaning for the newly exec'd process. 758 */ 759 if (pcb->pcb_flags & PCB_DBREGS) { 760 pcb->pcb_dr0 = 0; 761 pcb->pcb_dr1 = 0; 762 pcb->pcb_dr2 = 0; 763 pcb->pcb_dr3 = 0; 764 pcb->pcb_dr6 = 0; 765 pcb->pcb_dr7 = 0; 766 if (pcb == PCPU_GET(curpcb)) { 767 /* 768 * Clear the debug registers on the running 769 * CPU, otherwise they will end up affecting 770 * the next process we switch to. 771 */ 772 reset_dbregs(); 773 } 774 pcb->pcb_flags &= ~PCB_DBREGS; 775 } 776 777 /* 778 * Drop the FP state if we hold it, so that the process gets a 779 * clean FP state if it uses the FPU again. 780 */ 781 fpstate_drop(td); 782} 783 784void 785cpu_setregs(void) 786{ 787 register_t cr0; 788 789 cr0 = rcr0(); 790 /* 791 * CR0_MP, CR0_NE and CR0_TS are also set by npx_probe() for the 792 * BSP. See the comments there about why we set them. 793 */ 794 cr0 |= CR0_MP | CR0_NE | CR0_TS | CR0_WP | CR0_AM; 795 load_cr0(cr0); 796} 797 798/* 799 * Initialize amd64 and configure to run kernel 800 */ 801 802/* 803 * Initialize segments & interrupt table 804 */ 805 806struct user_segment_descriptor gdt[NGDT * MAXCPU];/* global descriptor tables */ 807static struct gate_descriptor idt0[NIDT]; 808struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */ 809 810static char dblfault_stack[PAGE_SIZE] __aligned(16); 811 812struct amd64tss common_tss[MAXCPU]; 813 814/* software prototypes -- in more palatable form */ 815struct soft_segment_descriptor gdt_segs[] = { 816/* GNULL_SEL 0 Null Descriptor */ 817{ 0x0, /* segment base address */ 818 0x0, /* length */ 819 0, /* segment type */ 820 0, /* segment descriptor priority level */ 821 0, /* segment descriptor present */ 822 0, /* long */ 823 0, /* default 32 vs 16 bit size */ 824 0 /* limit granularity (byte/page units)*/ }, 825/* GCODE_SEL 1 Code Descriptor for kernel */ 826{ 0x0, /* segment base address */ 827 0xfffff, /* length - all address space */ 828 SDT_MEMERA, /* segment type */ 829 SEL_KPL, /* segment descriptor priority level */ 830 1, /* segment descriptor present */ 831 1, /* long */ 832 0, /* default 32 vs 16 bit size */ 833 1 /* limit granularity (byte/page units)*/ }, 834/* GDATA_SEL 2 Data Descriptor for kernel */ 835{ 0x0, /* segment base address */ 836 0xfffff, /* length - all address space */ 837 SDT_MEMRWA, /* segment type */ 838 SEL_KPL, /* segment descriptor priority level */ 839 1, /* segment descriptor present */ 840 1, /* long */ 841 0, /* default 32 vs 16 bit size */ 842 1 /* limit granularity (byte/page units)*/ }, 843/* GUCODE32_SEL 3 32 bit Code Descriptor for user */ 844{ 0x0, /* segment base address */ 845 0xfffff, /* length - all address space */ 846 SDT_MEMERA, /* segment type */ 847 SEL_UPL, /* segment descriptor priority level */ 848 1, /* segment descriptor present */ 849 0, /* long */ 850 1, /* default 32 vs 16 bit size */ 851 1 /* limit granularity (byte/page units)*/ }, 852/* GUDATA_SEL 4 32/64 bit Data Descriptor for user */ 853{ 0x0, /* segment base address */ 854 0xfffff, /* length - all address space */ 855 SDT_MEMRWA, /* segment type */ 856 SEL_UPL, /* segment descriptor priority level */ 857 1, /* segment descriptor present */ 858 0, /* long */ 859 1, /* default 32 vs 16 bit size */ 860 1 /* limit granularity (byte/page units)*/ }, 861/* GUCODE_SEL 5 64 bit Code Descriptor for user */ 862{ 0x0, /* segment base address */ 863 0xfffff, /* length - all address space */ 864 SDT_MEMERA, /* segment type */ 865 SEL_UPL, /* segment descriptor priority level */ 866 1, /* segment descriptor present */ 867 1, /* long */ 868 0, /* default 32 vs 16 bit size */ 869 1 /* limit granularity (byte/page units)*/ }, 870/* GPROC0_SEL 6 Proc 0 Tss Descriptor */ 871{ 872 0x0, /* segment base address */ 873 sizeof(struct amd64tss)-1,/* length */ 874 SDT_SYSTSS, /* segment type */ 875 SEL_KPL, /* segment descriptor priority level */ 876 1, /* segment descriptor present */ 877 0, /* long */ 878 0, /* unused - default 32 vs 16 bit size */ 879 0 /* limit granularity (byte/page units)*/ }, 880/* Actually, the TSS is a system descriptor which is double size */ 881{ 0x0, /* segment base address */ 882 0x0, /* length */ 883 0, /* segment type */ 884 0, /* segment descriptor priority level */ 885 0, /* segment descriptor present */ 886 0, /* long */ 887 0, /* default 32 vs 16 bit size */ 888 0 /* limit granularity (byte/page units)*/ }, 889/* GUGS32_SEL 8 32 bit GS Descriptor for user */ 890{ 0x0, /* segment base address */ 891 0xfffff, /* length - all address space */ 892 SDT_MEMRWA, /* segment type */ 893 SEL_UPL, /* segment descriptor priority level */ 894 1, /* segment descriptor present */ 895 0, /* long */ 896 1, /* default 32 vs 16 bit size */ 897 1 /* limit granularity (byte/page units)*/ }, 898}; 899 900void 901setidt(idx, func, typ, dpl, ist) 902 int idx; 903 inthand_t *func; 904 int typ; 905 int dpl; 906 int ist; 907{ 908 struct gate_descriptor *ip; 909 910 ip = idt + idx; 911 ip->gd_looffset = (uintptr_t)func; 912 ip->gd_selector = GSEL(GCODE_SEL, SEL_KPL); 913 ip->gd_ist = ist; 914 ip->gd_xx = 0; 915 ip->gd_type = typ; 916 ip->gd_dpl = dpl; 917 ip->gd_p = 1; 918 ip->gd_hioffset = ((uintptr_t)func)>>16 ; 919} 920 921extern inthand_t 922 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 923 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 924 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 925 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 926 IDTVEC(xmm), IDTVEC(dblfault), 927 IDTVEC(fast_syscall), IDTVEC(fast_syscall32); 928 929void 930sdtossd(sd, ssd) 931 struct user_segment_descriptor *sd; 932 struct soft_segment_descriptor *ssd; 933{ 934 935 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 936 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 937 ssd->ssd_type = sd->sd_type; 938 ssd->ssd_dpl = sd->sd_dpl; 939 ssd->ssd_p = sd->sd_p; 940 ssd->ssd_long = sd->sd_long; 941 ssd->ssd_def32 = sd->sd_def32; 942 ssd->ssd_gran = sd->sd_gran; 943} 944 945void 946ssdtosd(ssd, sd) 947 struct soft_segment_descriptor *ssd; 948 struct user_segment_descriptor *sd; 949{ 950 951 sd->sd_lobase = (ssd->ssd_base) & 0xffffff; 952 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xff; 953 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff; 954 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf; 955 sd->sd_type = ssd->ssd_type; 956 sd->sd_dpl = ssd->ssd_dpl; 957 sd->sd_p = ssd->ssd_p; 958 sd->sd_long = ssd->ssd_long; 959 sd->sd_def32 = ssd->ssd_def32; 960 sd->sd_gran = ssd->ssd_gran; 961} 962 963void 964ssdtosyssd(ssd, sd) 965 struct soft_segment_descriptor *ssd; 966 struct system_segment_descriptor *sd; 967{ 968 969 sd->sd_lobase = (ssd->ssd_base) & 0xffffff; 970 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xfffffffffful; 971 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff; 972 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf; 973 sd->sd_type = ssd->ssd_type; 974 sd->sd_dpl = ssd->ssd_dpl; 975 sd->sd_p = ssd->ssd_p; 976 sd->sd_gran = ssd->ssd_gran; 977} 978 979#if !defined(DEV_ATPIC) && defined(DEV_ISA) 980#include <isa/isavar.h> 981#include <isa/isareg.h> 982/* 983 * Return a bitmap of the current interrupt requests. This is 8259-specific 984 * and is only suitable for use at probe time. 985 * This is only here to pacify sio. It is NOT FATAL if this doesn't work. 986 * It shouldn't be here. There should probably be an APIC centric 987 * implementation in the apic driver code, if at all. 988 */ 989intrmask_t 990isa_irq_pending(void) 991{ 992 u_char irr1; 993 u_char irr2; 994 995 irr1 = inb(IO_ICU1); 996 irr2 = inb(IO_ICU2); 997 return ((irr2 << 8) | irr1); 998} 999#endif 1000 1001u_int basemem; 1002 1003/* 1004 * Populate the (physmap) array with base/bound pairs describing the 1005 * available physical memory in the system, then test this memory and 1006 * build the phys_avail array describing the actually-available memory. 1007 * 1008 * If we cannot accurately determine the physical memory map, then use 1009 * value from the 0xE801 call, and failing that, the RTC. 1010 * 1011 * Total memory size may be set by the kernel environment variable 1012 * hw.physmem or the compile-time define MAXMEM. 1013 * 1014 * XXX first should be vm_paddr_t. 1015 */ 1016static void 1017getmemsize(caddr_t kmdp, u_int64_t first) 1018{ 1019 int i, off, physmap_idx, pa_indx, da_indx; 1020 vm_paddr_t pa, physmap[PHYSMAP_SIZE]; 1021 u_long physmem_tunable; 1022 pt_entry_t *pte; 1023 struct bios_smap *smapbase, *smap, *smapend; 1024 u_int32_t smapsize; 1025 quad_t dcons_addr, dcons_size; 1026 1027 bzero(physmap, sizeof(physmap)); 1028 basemem = 0; 1029 physmap_idx = 0; 1030 1031 /* 1032 * get memory map from INT 15:E820, kindly supplied by the loader. 1033 * 1034 * subr_module.c says: 1035 * "Consumer may safely assume that size value precedes data." 1036 * ie: an int32_t immediately precedes smap. 1037 */ 1038 smapbase = (struct bios_smap *)preload_search_info(kmdp, 1039 MODINFO_METADATA | MODINFOMD_SMAP); 1040 if (smapbase == NULL) 1041 panic("No BIOS smap info from loader!"); 1042 1043 smapsize = *((u_int32_t *)smapbase - 1); 1044 smapend = (struct bios_smap *)((uintptr_t)smapbase + smapsize); 1045 1046 for (smap = smapbase; smap < smapend; smap++) { 1047 if (boothowto & RB_VERBOSE) 1048 printf("SMAP type=%02x base=%016lx len=%016lx\n", 1049 smap->type, smap->base, smap->length); 1050 1051 if (smap->type != SMAP_TYPE_MEMORY) 1052 continue; 1053 1054 if (smap->length == 0) 1055 continue; 1056 1057 for (i = 0; i <= physmap_idx; i += 2) { 1058 if (smap->base < physmap[i + 1]) { 1059 if (boothowto & RB_VERBOSE) 1060 printf( 1061 "Overlapping or non-monotonic memory region, ignoring second region\n"); 1062 continue; 1063 } 1064 } 1065 1066 if (smap->base == physmap[physmap_idx + 1]) { 1067 physmap[physmap_idx + 1] += smap->length; 1068 continue; 1069 } 1070 1071 physmap_idx += 2; 1072 if (physmap_idx == PHYSMAP_SIZE) { 1073 printf( 1074 "Too many segments in the physical address map, giving up\n"); 1075 break; 1076 } 1077 physmap[physmap_idx] = smap->base; 1078 physmap[physmap_idx + 1] = smap->base + smap->length; 1079 } 1080 1081 /* 1082 * Find the 'base memory' segment for SMP 1083 */ 1084 basemem = 0; 1085 for (i = 0; i <= physmap_idx; i += 2) { 1086 if (physmap[i] == 0x00000000) { 1087 basemem = physmap[i + 1] / 1024; 1088 break; 1089 } 1090 } 1091 if (basemem == 0) 1092 panic("BIOS smap did not include a basemem segment!"); 1093 1094#ifdef SMP 1095 /* make hole for AP bootstrap code */ 1096 physmap[1] = mp_bootaddress(physmap[1] / 1024); 1097#endif 1098 1099 /* 1100 * Maxmem isn't the "maximum memory", it's one larger than the 1101 * highest page of the physical address space. It should be 1102 * called something like "Maxphyspage". We may adjust this 1103 * based on ``hw.physmem'' and the results of the memory test. 1104 */ 1105 Maxmem = atop(physmap[physmap_idx + 1]); 1106 1107#ifdef MAXMEM 1108 Maxmem = MAXMEM / 4; 1109#endif 1110 1111 if (TUNABLE_ULONG_FETCH("hw.physmem", &physmem_tunable)) 1112 Maxmem = atop(physmem_tunable); 1113 1114 /* 1115 * Don't allow MAXMEM or hw.physmem to extend the amount of memory 1116 * in the system. 1117 */ 1118 if (Maxmem > atop(physmap[physmap_idx + 1])) 1119 Maxmem = atop(physmap[physmap_idx + 1]); 1120 1121 if (atop(physmap[physmap_idx + 1]) != Maxmem && 1122 (boothowto & RB_VERBOSE)) 1123 printf("Physical memory use set to %ldK\n", Maxmem * 4); 1124 1125 /* call pmap initialization to make new kernel address space */ 1126 pmap_bootstrap(&first); 1127 1128 /* 1129 * Size up each available chunk of physical memory. 1130 */ 1131 physmap[0] = PAGE_SIZE; /* mask off page 0 */ 1132 pa_indx = 0; 1133 da_indx = 1; 1134 phys_avail[pa_indx++] = physmap[0]; 1135 phys_avail[pa_indx] = physmap[0]; 1136 dump_avail[da_indx] = physmap[0]; 1137 pte = CMAP1; 1138 1139 /* 1140 * Get dcons buffer address 1141 */ 1142 if (getenv_quad("dcons.addr", &dcons_addr) == 0 || 1143 getenv_quad("dcons.size", &dcons_size) == 0) 1144 dcons_addr = 0; 1145 1146 /* 1147 * physmap is in bytes, so when converting to page boundaries, 1148 * round up the start address and round down the end address. 1149 */ 1150 for (i = 0; i <= physmap_idx; i += 2) { 1151 vm_paddr_t end; 1152 1153 end = ptoa((vm_paddr_t)Maxmem); 1154 if (physmap[i + 1] < end) 1155 end = trunc_page(physmap[i + 1]); 1156 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) { 1157 int tmp, page_bad, full; 1158 int *ptr = (int *)CADDR1; 1159 1160 full = FALSE; 1161 /* 1162 * block out kernel memory as not available. 1163 */ 1164 if (pa >= 0x100000 && pa < first) 1165 goto do_dump_avail; 1166 1167 /* 1168 * block out dcons buffer 1169 */ 1170 if (dcons_addr > 0 1171 && pa >= trunc_page(dcons_addr) 1172 && pa < dcons_addr + dcons_size) 1173 goto do_dump_avail; 1174 1175 page_bad = FALSE; 1176 1177 /* 1178 * map page into kernel: valid, read/write,non-cacheable 1179 */ 1180 *pte = pa | PG_V | PG_RW | PG_N; 1181 invltlb(); 1182 1183 tmp = *(int *)ptr; 1184 /* 1185 * Test for alternating 1's and 0's 1186 */ 1187 *(volatile int *)ptr = 0xaaaaaaaa; 1188 if (*(volatile int *)ptr != 0xaaaaaaaa) 1189 page_bad = TRUE; 1190 /* 1191 * Test for alternating 0's and 1's 1192 */ 1193 *(volatile int *)ptr = 0x55555555; 1194 if (*(volatile int *)ptr != 0x55555555) 1195 page_bad = TRUE; 1196 /* 1197 * Test for all 1's 1198 */ 1199 *(volatile int *)ptr = 0xffffffff; 1200 if (*(volatile int *)ptr != 0xffffffff) 1201 page_bad = TRUE; 1202 /* 1203 * Test for all 0's 1204 */ 1205 *(volatile int *)ptr = 0x0; 1206 if (*(volatile int *)ptr != 0x0) 1207 page_bad = TRUE; 1208 /* 1209 * Restore original value. 1210 */ 1211 *(int *)ptr = tmp; 1212 1213 /* 1214 * Adjust array of valid/good pages. 1215 */ 1216 if (page_bad == TRUE) 1217 continue; 1218 /* 1219 * If this good page is a continuation of the 1220 * previous set of good pages, then just increase 1221 * the end pointer. Otherwise start a new chunk. 1222 * Note that "end" points one higher than end, 1223 * making the range >= start and < end. 1224 * If we're also doing a speculative memory 1225 * test and we at or past the end, bump up Maxmem 1226 * so that we keep going. The first bad page 1227 * will terminate the loop. 1228 */ 1229 if (phys_avail[pa_indx] == pa) { 1230 phys_avail[pa_indx] += PAGE_SIZE; 1231 } else { 1232 pa_indx++; 1233 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 1234 printf( 1235 "Too many holes in the physical address space, giving up\n"); 1236 pa_indx--; 1237 full = TRUE; 1238 goto do_dump_avail; 1239 } 1240 phys_avail[pa_indx++] = pa; /* start */ 1241 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */ 1242 } 1243 physmem++; 1244do_dump_avail: 1245 if (dump_avail[da_indx] == pa) { 1246 dump_avail[da_indx] += PAGE_SIZE; 1247 } else { 1248 da_indx++; 1249 if (da_indx == DUMP_AVAIL_ARRAY_END) { 1250 da_indx--; 1251 goto do_next; 1252 } 1253 dump_avail[da_indx++] = pa; /* start */ 1254 dump_avail[da_indx] = pa + PAGE_SIZE; /* end */ 1255 } 1256do_next: 1257 if (full) 1258 break; 1259 } 1260 } 1261 *pte = 0; 1262 invltlb(); 1263 1264 /* 1265 * XXX 1266 * The last chunk must contain at least one page plus the message 1267 * buffer to avoid complicating other code (message buffer address 1268 * calculation, etc.). 1269 */ 1270 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 1271 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) { 1272 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 1273 phys_avail[pa_indx--] = 0; 1274 phys_avail[pa_indx--] = 0; 1275 } 1276 1277 Maxmem = atop(phys_avail[pa_indx]); 1278 1279 /* Trim off space for the message buffer. */ 1280 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE); 1281 1282 /* Map the message buffer. */ 1283 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE) 1284 pmap_kenter((vm_offset_t)msgbufp + off, phys_avail[pa_indx] + 1285 off); 1286} 1287 1288u_int64_t 1289hammer_time(u_int64_t modulep, u_int64_t physfree) 1290{ 1291 caddr_t kmdp; 1292 int gsel_tss, x; 1293 struct pcpu *pc; 1294 u_int64_t msr; 1295 char *env; 1296 1297 thread0.td_kstack = physfree + KERNBASE; 1298 bzero((void *)thread0.td_kstack, KSTACK_PAGES * PAGE_SIZE); 1299 physfree += KSTACK_PAGES * PAGE_SIZE; 1300 thread0.td_pcb = (struct pcb *) 1301 (thread0.td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1; 1302 1303 /* 1304 * This may be done better later if it gets more high level 1305 * components in it. If so just link td->td_proc here. 1306 */ 1307 proc_linkup0(&proc0, &thread0); 1308 1309 preload_metadata = (caddr_t)(uintptr_t)(modulep + KERNBASE); 1310 preload_bootstrap_relocate(KERNBASE); 1311 kmdp = preload_search_by_type("elf kernel"); 1312 if (kmdp == NULL) 1313 kmdp = preload_search_by_type("elf64 kernel"); 1314 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int); 1315 kern_envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *) + KERNBASE; 1316#ifdef DDB 1317 ksym_start = MD_FETCH(kmdp, MODINFOMD_SSYM, uintptr_t); 1318 ksym_end = MD_FETCH(kmdp, MODINFOMD_ESYM, uintptr_t); 1319#endif 1320 1321 /* Init basic tunables, hz etc */ 1322 init_param1(); 1323 1324 /* 1325 * make gdt memory segments 1326 */ 1327 gdt_segs[GPROC0_SEL].ssd_base = (uintptr_t)&common_tss[0]; 1328 1329 for (x = 0; x < NGDT; x++) { 1330 if (x != GPROC0_SEL && x != (GPROC0_SEL + 1)) 1331 ssdtosd(&gdt_segs[x], &gdt[x]); 1332 } 1333 ssdtosyssd(&gdt_segs[GPROC0_SEL], 1334 (struct system_segment_descriptor *)&gdt[GPROC0_SEL]); 1335 1336 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1; 1337 r_gdt.rd_base = (long) gdt; 1338 lgdt(&r_gdt); 1339 pc = &__pcpu[0]; 1340 1341 wrmsr(MSR_FSBASE, 0); /* User value */ 1342 wrmsr(MSR_GSBASE, (u_int64_t)pc); 1343 wrmsr(MSR_KGSBASE, 0); /* User value while in the kernel */ 1344 1345 pcpu_init(pc, 0, sizeof(struct pcpu)); 1346 PCPU_SET(prvspace, pc); 1347 PCPU_SET(curthread, &thread0); 1348 PCPU_SET(curpcb, thread0.td_pcb); 1349 PCPU_SET(tssp, &common_tss[0]); 1350 1351 /* 1352 * Initialize mutexes. 1353 * 1354 * icu_lock: in order to allow an interrupt to occur in a critical 1355 * section, to set pcpu->ipending (etc...) properly, we 1356 * must be able to get the icu lock, so it can't be 1357 * under witness. 1358 */ 1359 mutex_init(); 1360 mtx_init(&icu_lock, "icu", NULL, MTX_SPIN | MTX_NOWITNESS); 1361 1362 /* exceptions */ 1363 for (x = 0; x < NIDT; x++) 1364 setidt(x, &IDTVEC(rsvd), SDT_SYSIGT, SEL_KPL, 0); 1365 setidt(IDT_DE, &IDTVEC(div), SDT_SYSIGT, SEL_KPL, 0); 1366 setidt(IDT_DB, &IDTVEC(dbg), SDT_SYSIGT, SEL_KPL, 0); 1367 setidt(IDT_NMI, &IDTVEC(nmi), SDT_SYSIGT, SEL_KPL, 1); 1368 setidt(IDT_BP, &IDTVEC(bpt), SDT_SYSIGT, SEL_UPL, 0); 1369 setidt(IDT_OF, &IDTVEC(ofl), SDT_SYSIGT, SEL_KPL, 0); 1370 setidt(IDT_BR, &IDTVEC(bnd), SDT_SYSIGT, SEL_KPL, 0); 1371 setidt(IDT_UD, &IDTVEC(ill), SDT_SYSIGT, SEL_KPL, 0); 1372 setidt(IDT_NM, &IDTVEC(dna), SDT_SYSIGT, SEL_KPL, 0); 1373 setidt(IDT_DF, &IDTVEC(dblfault), SDT_SYSIGT, SEL_KPL, 1); 1374 setidt(IDT_FPUGP, &IDTVEC(fpusegm), SDT_SYSIGT, SEL_KPL, 0); 1375 setidt(IDT_TS, &IDTVEC(tss), SDT_SYSIGT, SEL_KPL, 0); 1376 setidt(IDT_NP, &IDTVEC(missing), SDT_SYSIGT, SEL_KPL, 0); 1377 setidt(IDT_SS, &IDTVEC(stk), SDT_SYSIGT, SEL_KPL, 0); 1378 setidt(IDT_GP, &IDTVEC(prot), SDT_SYSIGT, SEL_KPL, 0); 1379 setidt(IDT_PF, &IDTVEC(page), SDT_SYSIGT, SEL_KPL, 0); 1380 setidt(IDT_MF, &IDTVEC(fpu), SDT_SYSIGT, SEL_KPL, 0); 1381 setidt(IDT_AC, &IDTVEC(align), SDT_SYSIGT, SEL_KPL, 0); 1382 setidt(IDT_MC, &IDTVEC(mchk), SDT_SYSIGT, SEL_KPL, 0); 1383 setidt(IDT_XF, &IDTVEC(xmm), SDT_SYSIGT, SEL_KPL, 0); 1384 1385 r_idt.rd_limit = sizeof(idt0) - 1; 1386 r_idt.rd_base = (long) idt; 1387 lidt(&r_idt); 1388 1389 /* 1390 * Initialize the i8254 before the console so that console 1391 * initialization can use DELAY(). 1392 */ 1393 i8254_init(); 1394 1395 /* 1396 * Initialize the console before we print anything out. 1397 */ 1398 cninit(); 1399 1400#ifdef DEV_ISA 1401#ifdef DEV_ATPIC 1402 elcr_probe(); 1403 atpic_startup(); 1404#else 1405 /* Reset and mask the atpics and leave them shut down. */ 1406 atpic_reset(); 1407 1408 /* 1409 * Point the ICU spurious interrupt vectors at the APIC spurious 1410 * interrupt handler. 1411 */ 1412 setidt(IDT_IO_INTS + 7, IDTVEC(spuriousint), SDT_SYSIGT, SEL_KPL, 0); 1413 setidt(IDT_IO_INTS + 15, IDTVEC(spuriousint), SDT_SYSIGT, SEL_KPL, 0); 1414#endif 1415#else 1416#error "have you forgotten the isa device?"; 1417#endif 1418 1419 kdb_init(); 1420 1421#ifdef KDB 1422 if (boothowto & RB_KDB) 1423 kdb_enter(KDB_WHY_BOOTFLAGS, 1424 "Boot flags requested debugger"); 1425#endif 1426 1427 identify_cpu(); /* Final stage of CPU initialization */ 1428 initializecpu(); /* Initialize CPU registers */ 1429 1430 /* make an initial tss so cpu can get interrupt stack on syscall! */ 1431 common_tss[0].tss_rsp0 = thread0.td_kstack + \ 1432 KSTACK_PAGES * PAGE_SIZE - sizeof(struct pcb); 1433 /* Ensure the stack is aligned to 16 bytes */ 1434 common_tss[0].tss_rsp0 &= ~0xFul; 1435 PCPU_SET(rsp0, common_tss[0].tss_rsp0); 1436 1437 /* doublefault stack space, runs on ist1 */ 1438 common_tss[0].tss_ist1 = (long)&dblfault_stack[sizeof(dblfault_stack)]; 1439 1440 /* Set the IO permission bitmap (empty due to tss seg limit) */ 1441 common_tss[0].tss_iobase = sizeof(struct amd64tss); 1442 1443 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 1444 ltr(gsel_tss); 1445 1446 /* Set up the fast syscall stuff */ 1447 msr = rdmsr(MSR_EFER) | EFER_SCE; 1448 wrmsr(MSR_EFER, msr); 1449 wrmsr(MSR_LSTAR, (u_int64_t)IDTVEC(fast_syscall)); 1450 wrmsr(MSR_CSTAR, (u_int64_t)IDTVEC(fast_syscall32)); 1451 msr = ((u_int64_t)GSEL(GCODE_SEL, SEL_KPL) << 32) | 1452 ((u_int64_t)GSEL(GUCODE32_SEL, SEL_UPL) << 48); 1453 wrmsr(MSR_STAR, msr); 1454 wrmsr(MSR_SF_MASK, PSL_NT|PSL_T|PSL_I|PSL_C|PSL_D); 1455 1456 getmemsize(kmdp, physfree); 1457 init_param2(physmem); 1458 1459 /* now running on new page tables, configured,and u/iom is accessible */ 1460 1461 msgbufinit(msgbufp, MSGBUF_SIZE); 1462 fpuinit(); 1463 1464 /* transfer to user mode */ 1465 1466 _ucodesel = GSEL(GUCODE_SEL, SEL_UPL); 1467 _udatasel = GSEL(GUDATA_SEL, SEL_UPL); 1468 _ucode32sel = GSEL(GUCODE32_SEL, SEL_UPL); 1469 1470 load_ds(_udatasel); 1471 load_es(_udatasel); 1472 load_fs(_udatasel); 1473 1474 /* setup proc 0's pcb */ 1475 thread0.td_pcb->pcb_flags = 0; 1476 thread0.td_pcb->pcb_cr3 = KPML4phys; 1477 thread0.td_frame = &proc0_tf; 1478 1479 env = getenv("kernelname"); 1480 if (env != NULL) 1481 strlcpy(kernelname, env, sizeof(kernelname)); 1482 1483 /* Location of kernel stack for locore */ 1484 return ((u_int64_t)thread0.td_pcb); 1485} 1486 1487void 1488cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size) 1489{ 1490 1491 pcpu->pc_acpi_id = 0xffffffff; 1492} 1493 1494void 1495spinlock_enter(void) 1496{ 1497 struct thread *td; 1498 1499 td = curthread; 1500 if (td->td_md.md_spinlock_count == 0) 1501 td->td_md.md_saved_flags = intr_disable(); 1502 td->td_md.md_spinlock_count++; 1503 critical_enter(); 1504} 1505 1506void 1507spinlock_exit(void) 1508{ 1509 struct thread *td; 1510 1511 td = curthread; 1512 critical_exit(); 1513 td->td_md.md_spinlock_count--; 1514 if (td->td_md.md_spinlock_count == 0) 1515 intr_restore(td->td_md.md_saved_flags); 1516} 1517 1518/* 1519 * Construct a PCB from a trapframe. This is called from kdb_trap() where 1520 * we want to start a backtrace from the function that caused us to enter 1521 * the debugger. We have the context in the trapframe, but base the trace 1522 * on the PCB. The PCB doesn't have to be perfect, as long as it contains 1523 * enough for a backtrace. 1524 */ 1525void 1526makectx(struct trapframe *tf, struct pcb *pcb) 1527{ 1528 1529 pcb->pcb_r12 = tf->tf_r12; 1530 pcb->pcb_r13 = tf->tf_r13; 1531 pcb->pcb_r14 = tf->tf_r14; 1532 pcb->pcb_r15 = tf->tf_r15; 1533 pcb->pcb_rbp = tf->tf_rbp; 1534 pcb->pcb_rbx = tf->tf_rbx; 1535 pcb->pcb_rip = tf->tf_rip; 1536 pcb->pcb_rsp = (ISPL(tf->tf_cs)) ? tf->tf_rsp : (long)(tf + 1) - 8; 1537} 1538 1539int 1540ptrace_set_pc(struct thread *td, unsigned long addr) 1541{ 1542 td->td_frame->tf_rip = addr; 1543 return (0); 1544} 1545 1546int 1547ptrace_single_step(struct thread *td) 1548{ 1549 td->td_frame->tf_rflags |= PSL_T; 1550 return (0); 1551} 1552 1553int 1554ptrace_clear_single_step(struct thread *td) 1555{ 1556 td->td_frame->tf_rflags &= ~PSL_T; 1557 return (0); 1558} 1559 1560int 1561fill_regs(struct thread *td, struct reg *regs) 1562{ 1563 struct trapframe *tp; 1564 1565 tp = td->td_frame; 1566 regs->r_r15 = tp->tf_r15; 1567 regs->r_r14 = tp->tf_r14; 1568 regs->r_r13 = tp->tf_r13; 1569 regs->r_r12 = tp->tf_r12; 1570 regs->r_r11 = tp->tf_r11; 1571 regs->r_r10 = tp->tf_r10; 1572 regs->r_r9 = tp->tf_r9; 1573 regs->r_r8 = tp->tf_r8; 1574 regs->r_rdi = tp->tf_rdi; 1575 regs->r_rsi = tp->tf_rsi; 1576 regs->r_rbp = tp->tf_rbp; 1577 regs->r_rbx = tp->tf_rbx; 1578 regs->r_rdx = tp->tf_rdx; 1579 regs->r_rcx = tp->tf_rcx; 1580 regs->r_rax = tp->tf_rax; 1581 regs->r_rip = tp->tf_rip; 1582 regs->r_cs = tp->tf_cs; 1583 regs->r_rflags = tp->tf_rflags; 1584 regs->r_rsp = tp->tf_rsp; 1585 regs->r_ss = tp->tf_ss; 1586 return (0); 1587} 1588 1589int 1590set_regs(struct thread *td, struct reg *regs) 1591{ 1592 struct trapframe *tp; 1593 register_t rflags; 1594 1595 tp = td->td_frame; 1596 rflags = regs->r_rflags & 0xffffffff; 1597 if (!EFL_SECURE(rflags, tp->tf_rflags) || !CS_SECURE(regs->r_cs)) 1598 return (EINVAL); 1599 tp->tf_r15 = regs->r_r15; 1600 tp->tf_r14 = regs->r_r14; 1601 tp->tf_r13 = regs->r_r13; 1602 tp->tf_r12 = regs->r_r12; 1603 tp->tf_r11 = regs->r_r11; 1604 tp->tf_r10 = regs->r_r10; 1605 tp->tf_r9 = regs->r_r9; 1606 tp->tf_r8 = regs->r_r8; 1607 tp->tf_rdi = regs->r_rdi; 1608 tp->tf_rsi = regs->r_rsi; 1609 tp->tf_rbp = regs->r_rbp; 1610 tp->tf_rbx = regs->r_rbx; 1611 tp->tf_rdx = regs->r_rdx; 1612 tp->tf_rcx = regs->r_rcx; 1613 tp->tf_rax = regs->r_rax; 1614 tp->tf_rip = regs->r_rip; 1615 tp->tf_cs = regs->r_cs; 1616 tp->tf_rflags = rflags; 1617 tp->tf_rsp = regs->r_rsp; 1618 tp->tf_ss = regs->r_ss; 1619 td->td_pcb->pcb_flags |= PCB_FULLCTX; 1620 return (0); 1621} 1622 1623/* XXX check all this stuff! */ 1624/* externalize from sv_xmm */ 1625static void 1626fill_fpregs_xmm(struct savefpu *sv_xmm, struct fpreg *fpregs) 1627{ 1628 struct envxmm *penv_fpreg = (struct envxmm *)&fpregs->fpr_env; 1629 struct envxmm *penv_xmm = &sv_xmm->sv_env; 1630 int i; 1631 1632 /* pcb -> fpregs */ 1633 bzero(fpregs, sizeof(*fpregs)); 1634 1635 /* FPU control/status */ 1636 penv_fpreg->en_cw = penv_xmm->en_cw; 1637 penv_fpreg->en_sw = penv_xmm->en_sw; 1638 penv_fpreg->en_tw = penv_xmm->en_tw; 1639 penv_fpreg->en_opcode = penv_xmm->en_opcode; 1640 penv_fpreg->en_rip = penv_xmm->en_rip; 1641 penv_fpreg->en_rdp = penv_xmm->en_rdp; 1642 penv_fpreg->en_mxcsr = penv_xmm->en_mxcsr; 1643 penv_fpreg->en_mxcsr_mask = penv_xmm->en_mxcsr_mask; 1644 1645 /* FPU registers */ 1646 for (i = 0; i < 8; ++i) 1647 bcopy(sv_xmm->sv_fp[i].fp_acc.fp_bytes, fpregs->fpr_acc[i], 10); 1648 1649 /* SSE registers */ 1650 for (i = 0; i < 16; ++i) 1651 bcopy(sv_xmm->sv_xmm[i].xmm_bytes, fpregs->fpr_xacc[i], 16); 1652} 1653 1654/* internalize from fpregs into sv_xmm */ 1655static void 1656set_fpregs_xmm(struct fpreg *fpregs, struct savefpu *sv_xmm) 1657{ 1658 struct envxmm *penv_xmm = &sv_xmm->sv_env; 1659 struct envxmm *penv_fpreg = (struct envxmm *)&fpregs->fpr_env; 1660 int i; 1661 1662 /* fpregs -> pcb */ 1663 /* FPU control/status */ 1664 penv_xmm->en_cw = penv_fpreg->en_cw; 1665 penv_xmm->en_sw = penv_fpreg->en_sw; 1666 penv_xmm->en_tw = penv_fpreg->en_tw; 1667 penv_xmm->en_opcode = penv_fpreg->en_opcode; 1668 penv_xmm->en_rip = penv_fpreg->en_rip; 1669 penv_xmm->en_rdp = penv_fpreg->en_rdp; 1670 penv_xmm->en_mxcsr = penv_fpreg->en_mxcsr; 1671 penv_xmm->en_mxcsr_mask = penv_fpreg->en_mxcsr_mask & cpu_mxcsr_mask; 1672 1673 /* FPU registers */ 1674 for (i = 0; i < 8; ++i) 1675 bcopy(fpregs->fpr_acc[i], sv_xmm->sv_fp[i].fp_acc.fp_bytes, 10); 1676 1677 /* SSE registers */ 1678 for (i = 0; i < 16; ++i) 1679 bcopy(fpregs->fpr_xacc[i], sv_xmm->sv_xmm[i].xmm_bytes, 16); 1680} 1681 1682/* externalize from td->pcb */ 1683int 1684fill_fpregs(struct thread *td, struct fpreg *fpregs) 1685{ 1686 1687 fill_fpregs_xmm(&td->td_pcb->pcb_save, fpregs); 1688 return (0); 1689} 1690 1691/* internalize to td->pcb */ 1692int 1693set_fpregs(struct thread *td, struct fpreg *fpregs) 1694{ 1695 1696 set_fpregs_xmm(fpregs, &td->td_pcb->pcb_save); 1697 return (0); 1698} 1699 1700/* 1701 * Get machine context. 1702 */ 1703int 1704get_mcontext(struct thread *td, mcontext_t *mcp, int flags) 1705{ 1706 struct trapframe *tp; 1707 1708 tp = td->td_frame; 1709 PROC_LOCK(curthread->td_proc); 1710 mcp->mc_onstack = sigonstack(tp->tf_rsp); 1711 PROC_UNLOCK(curthread->td_proc); 1712 mcp->mc_r15 = tp->tf_r15; 1713 mcp->mc_r14 = tp->tf_r14; 1714 mcp->mc_r13 = tp->tf_r13; 1715 mcp->mc_r12 = tp->tf_r12; 1716 mcp->mc_r11 = tp->tf_r11; 1717 mcp->mc_r10 = tp->tf_r10; 1718 mcp->mc_r9 = tp->tf_r9; 1719 mcp->mc_r8 = tp->tf_r8; 1720 mcp->mc_rdi = tp->tf_rdi; 1721 mcp->mc_rsi = tp->tf_rsi; 1722 mcp->mc_rbp = tp->tf_rbp; 1723 mcp->mc_rbx = tp->tf_rbx; 1724 mcp->mc_rcx = tp->tf_rcx; 1725 mcp->mc_rflags = tp->tf_rflags; 1726 if (flags & GET_MC_CLEAR_RET) { 1727 mcp->mc_rax = 0; 1728 mcp->mc_rdx = 0; 1729 mcp->mc_rflags &= ~PSL_C; 1730 } else { 1731 mcp->mc_rax = tp->tf_rax; 1732 mcp->mc_rdx = tp->tf_rdx; 1733 } 1734 mcp->mc_rip = tp->tf_rip; 1735 mcp->mc_cs = tp->tf_cs; 1736 mcp->mc_rsp = tp->tf_rsp; 1737 mcp->mc_ss = tp->tf_ss; 1738 mcp->mc_len = sizeof(*mcp); 1739 get_fpcontext(td, mcp); 1740 return (0); 1741} 1742 1743/* 1744 * Set machine context. 1745 * 1746 * However, we don't set any but the user modifiable flags, and we won't 1747 * touch the cs selector. 1748 */ 1749int 1750set_mcontext(struct thread *td, const mcontext_t *mcp) 1751{ 1752 struct trapframe *tp; 1753 long rflags; 1754 int ret; 1755 1756 tp = td->td_frame; 1757 if (mcp->mc_len != sizeof(*mcp)) 1758 return (EINVAL); 1759 rflags = (mcp->mc_rflags & PSL_USERCHANGE) | 1760 (tp->tf_rflags & ~PSL_USERCHANGE); 1761 ret = set_fpcontext(td, mcp); 1762 if (ret != 0) 1763 return (ret); 1764 tp->tf_r15 = mcp->mc_r15; 1765 tp->tf_r14 = mcp->mc_r14; 1766 tp->tf_r13 = mcp->mc_r13; 1767 tp->tf_r12 = mcp->mc_r12; 1768 tp->tf_r11 = mcp->mc_r11; 1769 tp->tf_r10 = mcp->mc_r10; 1770 tp->tf_r9 = mcp->mc_r9; 1771 tp->tf_r8 = mcp->mc_r8; 1772 tp->tf_rdi = mcp->mc_rdi; 1773 tp->tf_rsi = mcp->mc_rsi; 1774 tp->tf_rbp = mcp->mc_rbp; 1775 tp->tf_rbx = mcp->mc_rbx; 1776 tp->tf_rdx = mcp->mc_rdx; 1777 tp->tf_rcx = mcp->mc_rcx; 1778 tp->tf_rax = mcp->mc_rax; 1779 tp->tf_rip = mcp->mc_rip; 1780 tp->tf_rflags = rflags; 1781 tp->tf_rsp = mcp->mc_rsp; 1782 tp->tf_ss = mcp->mc_ss; 1783 td->td_pcb->pcb_flags |= PCB_FULLCTX; 1784 return (0); 1785} 1786 1787static void 1788get_fpcontext(struct thread *td, mcontext_t *mcp) 1789{ 1790 1791 mcp->mc_ownedfp = fpugetregs(td, (struct savefpu *)&mcp->mc_fpstate); 1792 mcp->mc_fpformat = fpuformat(); 1793} 1794 1795static int 1796set_fpcontext(struct thread *td, const mcontext_t *mcp) 1797{ 1798 struct savefpu *fpstate; 1799 1800 if (mcp->mc_fpformat == _MC_FPFMT_NODEV) 1801 return (0); 1802 else if (mcp->mc_fpformat != _MC_FPFMT_XMM) 1803 return (EINVAL); 1804 else if (mcp->mc_ownedfp == _MC_FPOWNED_NONE) 1805 /* We don't care what state is left in the FPU or PCB. */ 1806 fpstate_drop(td); 1807 else if (mcp->mc_ownedfp == _MC_FPOWNED_FPU || 1808 mcp->mc_ownedfp == _MC_FPOWNED_PCB) { 1809 /* 1810 * XXX we violate the dubious requirement that fpusetregs() 1811 * be called with interrupts disabled. 1812 * XXX obsolete on trap-16 systems? 1813 */ 1814 fpstate = (struct savefpu *)&mcp->mc_fpstate; 1815 fpstate->sv_env.en_mxcsr &= cpu_mxcsr_mask; 1816 fpusetregs(td, fpstate); 1817 } else 1818 return (EINVAL); 1819 return (0); 1820} 1821 1822void 1823fpstate_drop(struct thread *td) 1824{ 1825 register_t s; 1826 1827 s = intr_disable(); 1828 if (PCPU_GET(fpcurthread) == td) 1829 fpudrop(); 1830 /* 1831 * XXX force a full drop of the fpu. The above only drops it if we 1832 * owned it. 1833 * 1834 * XXX I don't much like fpugetregs()'s semantics of doing a full 1835 * drop. Dropping only to the pcb matches fnsave's behaviour. 1836 * We only need to drop to !PCB_INITDONE in sendsig(). But 1837 * sendsig() is the only caller of fpugetregs()... perhaps we just 1838 * have too many layers. 1839 */ 1840 curthread->td_pcb->pcb_flags &= ~PCB_FPUINITDONE; 1841 intr_restore(s); 1842} 1843 1844int 1845fill_dbregs(struct thread *td, struct dbreg *dbregs) 1846{ 1847 struct pcb *pcb; 1848 1849 if (td == NULL) { 1850 dbregs->dr[0] = rdr0(); 1851 dbregs->dr[1] = rdr1(); 1852 dbregs->dr[2] = rdr2(); 1853 dbregs->dr[3] = rdr3(); 1854 dbregs->dr[6] = rdr6(); 1855 dbregs->dr[7] = rdr7(); 1856 } else { 1857 pcb = td->td_pcb; 1858 dbregs->dr[0] = pcb->pcb_dr0; 1859 dbregs->dr[1] = pcb->pcb_dr1; 1860 dbregs->dr[2] = pcb->pcb_dr2; 1861 dbregs->dr[3] = pcb->pcb_dr3; 1862 dbregs->dr[6] = pcb->pcb_dr6; 1863 dbregs->dr[7] = pcb->pcb_dr7; 1864 } 1865 dbregs->dr[4] = 0; 1866 dbregs->dr[5] = 0; 1867 dbregs->dr[8] = 0; 1868 dbregs->dr[9] = 0; 1869 dbregs->dr[10] = 0; 1870 dbregs->dr[11] = 0; 1871 dbregs->dr[12] = 0; 1872 dbregs->dr[13] = 0; 1873 dbregs->dr[14] = 0; 1874 dbregs->dr[15] = 0; 1875 return (0); 1876} 1877 1878int 1879set_dbregs(struct thread *td, struct dbreg *dbregs) 1880{ 1881 struct pcb *pcb; 1882 int i; 1883 1884 if (td == NULL) { 1885 load_dr0(dbregs->dr[0]); 1886 load_dr1(dbregs->dr[1]); 1887 load_dr2(dbregs->dr[2]); 1888 load_dr3(dbregs->dr[3]); 1889 load_dr6(dbregs->dr[6]); 1890 load_dr7(dbregs->dr[7]); 1891 } else { 1892 /* 1893 * Don't let an illegal value for dr7 get set. Specifically, 1894 * check for undefined settings. Setting these bit patterns 1895 * result in undefined behaviour and can lead to an unexpected 1896 * TRCTRAP or a general protection fault right here. 1897 * Upper bits of dr6 and dr7 must not be set 1898 */ 1899 for (i = 0; i < 4; i++) { 1900 if (DBREG_DR7_ACCESS(dbregs->dr[7], i) == 0x02) 1901 return (EINVAL); 1902 if (td->td_frame->tf_cs == _ucode32sel && 1903 DBREG_DR7_LEN(dbregs->dr[7], i) == DBREG_DR7_LEN_8) 1904 return (EINVAL); 1905 } 1906 if ((dbregs->dr[6] & 0xffffffff00000000ul) != 0 || 1907 (dbregs->dr[7] & 0xffffffff00000000ul) != 0) 1908 return (EINVAL); 1909 1910 pcb = td->td_pcb; 1911 1912 /* 1913 * Don't let a process set a breakpoint that is not within the 1914 * process's address space. If a process could do this, it 1915 * could halt the system by setting a breakpoint in the kernel 1916 * (if ddb was enabled). Thus, we need to check to make sure 1917 * that no breakpoints are being enabled for addresses outside 1918 * process's address space. 1919 * 1920 * XXX - what about when the watched area of the user's 1921 * address space is written into from within the kernel 1922 * ... wouldn't that still cause a breakpoint to be generated 1923 * from within kernel mode? 1924 */ 1925 1926 if (DBREG_DR7_ENABLED(dbregs->dr[7], 0)) { 1927 /* dr0 is enabled */ 1928 if (dbregs->dr[0] >= VM_MAXUSER_ADDRESS) 1929 return (EINVAL); 1930 } 1931 if (DBREG_DR7_ENABLED(dbregs->dr[7], 1)) { 1932 /* dr1 is enabled */ 1933 if (dbregs->dr[1] >= VM_MAXUSER_ADDRESS) 1934 return (EINVAL); 1935 } 1936 if (DBREG_DR7_ENABLED(dbregs->dr[7], 2)) { 1937 /* dr2 is enabled */ 1938 if (dbregs->dr[2] >= VM_MAXUSER_ADDRESS) 1939 return (EINVAL); 1940 } 1941 if (DBREG_DR7_ENABLED(dbregs->dr[7], 3)) { 1942 /* dr3 is enabled */ 1943 if (dbregs->dr[3] >= VM_MAXUSER_ADDRESS) 1944 return (EINVAL); 1945 } 1946 1947 pcb->pcb_dr0 = dbregs->dr[0]; 1948 pcb->pcb_dr1 = dbregs->dr[1]; 1949 pcb->pcb_dr2 = dbregs->dr[2]; 1950 pcb->pcb_dr3 = dbregs->dr[3]; 1951 pcb->pcb_dr6 = dbregs->dr[6]; 1952 pcb->pcb_dr7 = dbregs->dr[7]; 1953 1954 pcb->pcb_flags |= PCB_DBREGS; 1955 } 1956 1957 return (0); 1958} 1959 1960void 1961reset_dbregs(void) 1962{ 1963 1964 load_dr7(0); /* Turn off the control bits first */ 1965 load_dr0(0); 1966 load_dr1(0); 1967 load_dr2(0); 1968 load_dr3(0); 1969 load_dr6(0); 1970} 1971 1972/* 1973 * Return > 0 if a hardware breakpoint has been hit, and the 1974 * breakpoint was in user space. Return 0, otherwise. 1975 */ 1976int 1977user_dbreg_trap(void) 1978{ 1979 u_int64_t dr7, dr6; /* debug registers dr6 and dr7 */ 1980 u_int64_t bp; /* breakpoint bits extracted from dr6 */ 1981 int nbp; /* number of breakpoints that triggered */ 1982 caddr_t addr[4]; /* breakpoint addresses */ 1983 int i; 1984 1985 dr7 = rdr7(); 1986 if ((dr7 & 0x000000ff) == 0) { 1987 /* 1988 * all GE and LE bits in the dr7 register are zero, 1989 * thus the trap couldn't have been caused by the 1990 * hardware debug registers 1991 */ 1992 return 0; 1993 } 1994 1995 nbp = 0; 1996 dr6 = rdr6(); 1997 bp = dr6 & 0x0000000f; 1998 1999 if (!bp) { 2000 /* 2001 * None of the breakpoint bits are set meaning this 2002 * trap was not caused by any of the debug registers 2003 */ 2004 return 0; 2005 } 2006 2007 /* 2008 * at least one of the breakpoints were hit, check to see 2009 * which ones and if any of them are user space addresses 2010 */ 2011 2012 if (bp & 0x01) { 2013 addr[nbp++] = (caddr_t)rdr0(); 2014 } 2015 if (bp & 0x02) { 2016 addr[nbp++] = (caddr_t)rdr1(); 2017 } 2018 if (bp & 0x04) { 2019 addr[nbp++] = (caddr_t)rdr2(); 2020 } 2021 if (bp & 0x08) { 2022 addr[nbp++] = (caddr_t)rdr3(); 2023 } 2024 2025 for (i = 0; i < nbp; i++) { 2026 if (addr[i] < (caddr_t)VM_MAXUSER_ADDRESS) { 2027 /* 2028 * addr[i] is in user space 2029 */ 2030 return nbp; 2031 } 2032 } 2033 2034 /* 2035 * None of the breakpoints are in user space. 2036 */ 2037 return 0; 2038} 2039 2040#ifdef KDB 2041 2042/* 2043 * Provide inb() and outb() as functions. They are normally only 2044 * available as macros calling inlined functions, thus cannot be 2045 * called from the debugger. 2046 * 2047 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined. 2048 */ 2049 2050#undef inb 2051#undef outb 2052 2053/* silence compiler warnings */ 2054u_char inb(u_int); 2055void outb(u_int, u_char); 2056 2057u_char 2058inb(u_int port) 2059{ 2060 u_char data; 2061 /* 2062 * We use %%dx and not %1 here because i/o is done at %dx and not at 2063 * %edx, while gcc generates inferior code (movw instead of movl) 2064 * if we tell it to load (u_short) port. 2065 */ 2066 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 2067 return (data); 2068} 2069 2070void 2071outb(u_int port, u_char data) 2072{ 2073 u_char al; 2074 /* 2075 * Use an unnecessary assignment to help gcc's register allocator. 2076 * This make a large difference for gcc-1.40 and a tiny difference 2077 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for 2078 * best results. gcc-2.6.0 can't handle this. 2079 */ 2080 al = data; 2081 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 2082} 2083 2084#endif /* KDB */ 2085