machdep.c revision 147671
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 147671 2005-06-29 22:28:46Z peter $"); 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 57#include <sys/param.h> 58#include <sys/proc.h> 59#include <sys/systm.h> 60#include <sys/bio.h> 61#include <sys/buf.h> 62#include <sys/bus.h> 63#include <sys/callout.h> 64#include <sys/cons.h> 65#include <sys/cpu.h> 66#include <sys/eventhandler.h> 67#include <sys/exec.h> 68#include <sys/imgact.h> 69#include <sys/kdb.h> 70#include <sys/kernel.h> 71#include <sys/ktr.h> 72#include <sys/linker.h> 73#include <sys/lock.h> 74#include <sys/malloc.h> 75#include <sys/memrange.h> 76#include <sys/msgbuf.h> 77#include <sys/mutex.h> 78#include <sys/pcpu.h> 79#include <sys/ptrace.h> 80#include <sys/reboot.h> 81#include <sys/sched.h> 82#include <sys/signalvar.h> 83#include <sys/sysctl.h> 84#include <sys/sysent.h> 85#include <sys/sysproto.h> 86#include <sys/ucontext.h> 87#include <sys/vmmeter.h> 88 89#include <vm/vm.h> 90#include <vm/vm_extern.h> 91#include <vm/vm_kern.h> 92#include <vm/vm_page.h> 93#include <vm/vm_map.h> 94#include <vm/vm_object.h> 95#include <vm/vm_pager.h> 96#include <vm/vm_param.h> 97 98#ifdef DDB 99#ifndef KDB 100#error KDB must be enabled in order for DDB to work! 101#endif 102#endif 103#include <ddb/ddb.h> 104 105#include <net/netisr.h> 106 107#include <machine/clock.h> 108#include <machine/cpu.h> 109#include <machine/cputypes.h> 110#include <machine/intr_machdep.h> 111#include <machine/md_var.h> 112#include <machine/metadata.h> 113#include <machine/pc/bios.h> 114#include <machine/pcb.h> 115#include <machine/proc.h> 116#include <machine/reg.h> 117#include <machine/sigframe.h> 118#include <machine/specialreg.h> 119#ifdef PERFMON 120#include <machine/perfmon.h> 121#endif 122#include <machine/tss.h> 123#ifdef SMP 124#include <machine/smp.h> 125#endif 126 127#include <amd64/isa/icu.h> 128 129#include <isa/isareg.h> 130#include <isa/rtc.h> 131 132/* Sanity check for __curthread() */ 133CTASSERT(offsetof(struct pcpu, pc_curthread) == 0); 134 135extern u_int64_t hammer_time(u_int64_t, u_int64_t); 136extern void dblfault_handler(void); 137 138extern void printcpuinfo(void); /* XXX header file */ 139extern void identify_cpu(void); 140extern void panicifcpuunsupported(void); 141 142#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 143#define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 144 145static void cpu_startup(void *); 146static void get_fpcontext(struct thread *td, mcontext_t *mcp); 147static int set_fpcontext(struct thread *td, const mcontext_t *mcp); 148SYSINIT(cpu, SI_SUB_CPU, SI_ORDER_FIRST, cpu_startup, NULL) 149 150#ifdef DDB 151extern vm_offset_t ksym_start, ksym_end; 152#endif 153 154int _udatasel, _ucodesel, _ucode32sel; 155 156int cold = 1; 157 158long Maxmem = 0; 159long realmem = 0; 160 161vm_paddr_t phys_avail[20]; 162vm_paddr_t dump_avail[20]; 163 164/* must be 2 less so 0 0 can signal end of chunks */ 165#define PHYS_AVAIL_ARRAY_END ((sizeof(phys_avail) / sizeof(phys_avail[0])) - 2) 166#define DUMP_AVAIL_ARRAY_END ((sizeof(dump_avail) / sizeof(dump_avail[0])) - 2) 167 168struct kva_md_info kmi; 169 170static struct trapframe proc0_tf; 171struct region_descriptor r_gdt, r_idt; 172 173struct pcpu __pcpu[MAXCPU]; 174 175struct mtx icu_lock; 176 177struct mem_range_softc mem_range_softc; 178 179static void 180cpu_startup(dummy) 181 void *dummy; 182{ 183 /* 184 * Good {morning,afternoon,evening,night}. 185 */ 186 startrtclock(); 187 printcpuinfo(); 188 panicifcpuunsupported(); 189#ifdef PERFMON 190 perfmon_init(); 191#endif 192 printf("real memory = %ju (%ju MB)\n", ptoa((uintmax_t)Maxmem), 193 ptoa((uintmax_t)Maxmem) / 1048576); 194 realmem = Maxmem; 195 /* 196 * Display any holes after the first chunk of extended memory. 197 */ 198 if (bootverbose) { 199 int indx; 200 201 printf("Physical memory chunk(s):\n"); 202 for (indx = 0; phys_avail[indx + 1] != 0; indx += 2) { 203 vm_paddr_t size; 204 205 size = phys_avail[indx + 1] - phys_avail[indx]; 206 printf( 207 "0x%016jx - 0x%016jx, %ju bytes (%ju pages)\n", 208 (uintmax_t)phys_avail[indx], 209 (uintmax_t)phys_avail[indx + 1] - 1, 210 (uintmax_t)size, (uintmax_t)size / PAGE_SIZE); 211 } 212 } 213 214 vm_ksubmap_init(&kmi); 215 216 printf("avail memory = %ju (%ju MB)\n", 217 ptoa((uintmax_t)cnt.v_free_count), 218 ptoa((uintmax_t)cnt.v_free_count) / 1048576); 219 220 /* 221 * Set up buffers, so they can be used to read disk labels. 222 */ 223 bufinit(); 224 vm_pager_bufferinit(); 225 226 cpu_setregs(); 227} 228 229/* 230 * Send an interrupt to process. 231 * 232 * Stack is set up to allow sigcode stored 233 * at top to call routine, followed by kcall 234 * to sigreturn routine below. After sigreturn 235 * resets the signal mask, the stack, and the 236 * frame pointer, it returns to the user 237 * specified pc, psl. 238 */ 239void 240sendsig(catcher, sig, mask, code) 241 sig_t catcher; 242 int sig; 243 sigset_t *mask; 244 u_long code; 245{ 246 struct sigframe sf, *sfp; 247 struct proc *p; 248 struct thread *td; 249 struct sigacts *psp; 250 char *sp; 251 struct trapframe *regs; 252 int oonstack; 253 254 td = curthread; 255 p = td->td_proc; 256 PROC_LOCK_ASSERT(p, MA_OWNED); 257 psp = p->p_sigacts; 258 mtx_assert(&psp->ps_mtx, MA_OWNED); 259 regs = td->td_frame; 260 oonstack = sigonstack(regs->tf_rsp); 261 262 /* Save user context. */ 263 bzero(&sf, sizeof(sf)); 264 sf.sf_uc.uc_sigmask = *mask; 265 sf.sf_uc.uc_stack = td->td_sigstk; 266 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 267 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE; 268 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0; 269 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_rdi, sizeof(*regs)); 270 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */ 271 get_fpcontext(td, &sf.sf_uc.uc_mcontext); 272 fpstate_drop(td); 273 274 /* Allocate space for the signal handler context. */ 275 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack && 276 SIGISMEMBER(psp->ps_sigonstack, sig)) { 277 sp = td->td_sigstk.ss_sp + 278 td->td_sigstk.ss_size - sizeof(struct sigframe); 279#if defined(COMPAT_43) 280 td->td_sigstk.ss_flags |= SS_ONSTACK; 281#endif 282 } else 283 sp = (char *)regs->tf_rsp - sizeof(struct sigframe) - 128; 284 /* Align to 16 bytes. */ 285 sfp = (struct sigframe *)((unsigned long)sp & ~0xFul); 286 287 /* Translate the signal if appropriate. */ 288 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize) 289 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 290 291 /* Build the argument list for the signal handler. */ 292 regs->tf_rdi = sig; /* arg 1 in %rdi */ 293 regs->tf_rdx = (register_t)&sfp->sf_uc; /* arg 3 in %rdx */ 294 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 295 /* Signal handler installed with SA_SIGINFO. */ 296 regs->tf_rsi = (register_t)&sfp->sf_si; /* arg 2 in %rsi */ 297 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher; 298 299 /* Fill in POSIX parts */ 300 sf.sf_si.si_signo = sig; 301 sf.sf_si.si_code = code; 302 regs->tf_rcx = regs->tf_addr; /* arg 4 in %rcx */ 303 } else { 304 /* Old FreeBSD-style arguments. */ 305 regs->tf_rsi = code; /* arg 2 in %rsi */ 306 regs->tf_rcx = regs->tf_addr; /* arg 4 in %rcx */ 307 sf.sf_ahu.sf_handler = catcher; 308 } 309 mtx_unlock(&psp->ps_mtx); 310 PROC_UNLOCK(p); 311 312 /* 313 * Copy the sigframe out to the user's stack. 314 */ 315 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) { 316#ifdef DEBUG 317 printf("process %ld has trashed its stack\n", (long)p->p_pid); 318#endif 319 PROC_LOCK(p); 320 sigexit(td, SIGILL); 321 } 322 323 regs->tf_rsp = (long)sfp; 324 regs->tf_rip = PS_STRINGS - *(p->p_sysent->sv_szsigcode); 325 regs->tf_rflags &= ~PSL_T; 326 regs->tf_cs = _ucodesel; 327 PROC_LOCK(p); 328 mtx_lock(&psp->ps_mtx); 329} 330 331/* 332 * Build siginfo_t for SA thread 333 */ 334void 335cpu_thread_siginfo(int sig, u_long code, siginfo_t *si) 336{ 337 struct proc *p; 338 struct thread *td; 339 struct trapframe *regs; 340 341 td = curthread; 342 p = td->td_proc; 343 regs = td->td_frame; 344 PROC_LOCK_ASSERT(p, MA_OWNED); 345 346 bzero(si, sizeof(*si)); 347 si->si_signo = sig; 348 si->si_code = code; 349 si->si_addr = (void *)regs->tf_addr; 350 /* XXXKSE fill other fields */ 351} 352 353/* 354 * System call to cleanup state after a signal 355 * has been taken. Reset signal mask and 356 * stack state from context left by sendsig (above). 357 * Return to previous pc and psl as specified by 358 * context left by sendsig. Check carefully to 359 * make sure that the user has not modified the 360 * state to gain improper privileges. 361 * 362 * MPSAFE 363 */ 364int 365sigreturn(td, uap) 366 struct thread *td; 367 struct sigreturn_args /* { 368 const __ucontext *sigcntxp; 369 } */ *uap; 370{ 371 ucontext_t uc; 372 struct proc *p = td->td_proc; 373 struct trapframe *regs; 374 const ucontext_t *ucp; 375 long rflags; 376 int cs, error, ret; 377 378 error = copyin(uap->sigcntxp, &uc, sizeof(uc)); 379 if (error != 0) 380 return (error); 381 ucp = &uc; 382 regs = td->td_frame; 383 rflags = ucp->uc_mcontext.mc_rflags; 384 /* 385 * Don't allow users to change privileged or reserved flags. 386 */ 387 /* 388 * XXX do allow users to change the privileged flag PSL_RF. 389 * The cpu sets PSL_RF in tf_rflags for faults. Debuggers 390 * should sometimes set it there too. tf_rflags is kept in 391 * the signal context during signal handling and there is no 392 * other place to remember it, so the PSL_RF bit may be 393 * corrupted by the signal handler without us knowing. 394 * Corruption of the PSL_RF bit at worst causes one more or 395 * one less debugger trap, so allowing it is fairly harmless. 396 */ 397 if (!EFL_SECURE(rflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) { 398 printf("sigreturn: rflags = 0x%lx\n", rflags); 399 return (EINVAL); 400 } 401 402 /* 403 * Don't allow users to load a valid privileged %cs. Let the 404 * hardware check for invalid selectors, excess privilege in 405 * other selectors, invalid %eip's and invalid %esp's. 406 */ 407 cs = ucp->uc_mcontext.mc_cs; 408 if (!CS_SECURE(cs)) { 409 printf("sigreturn: cs = 0x%x\n", cs); 410 trapsignal(td, SIGBUS, T_PROTFLT); 411 return (EINVAL); 412 } 413 414 ret = set_fpcontext(td, &ucp->uc_mcontext); 415 if (ret != 0) 416 return (ret); 417 bcopy(&ucp->uc_mcontext.mc_rdi, regs, sizeof(*regs)); 418 419 PROC_LOCK(p); 420#if defined(COMPAT_43) 421 if (ucp->uc_mcontext.mc_onstack & 1) 422 td->td_sigstk.ss_flags |= SS_ONSTACK; 423 else 424 td->td_sigstk.ss_flags &= ~SS_ONSTACK; 425#endif 426 427 td->td_sigmask = ucp->uc_sigmask; 428 SIG_CANTMASK(td->td_sigmask); 429 signotify(td); 430 PROC_UNLOCK(p); 431 td->td_pcb->pcb_flags |= PCB_FULLCTX; 432 return (EJUSTRETURN); 433} 434 435#ifdef COMPAT_FREEBSD4 436int 437freebsd4_sigreturn(struct thread *td, struct freebsd4_sigreturn_args *uap) 438{ 439 440 return sigreturn(td, (struct sigreturn_args *)uap); 441} 442#endif 443 444 445/* 446 * Machine dependent boot() routine 447 * 448 * I haven't seen anything to put here yet 449 * Possibly some stuff might be grafted back here from boot() 450 */ 451void 452cpu_boot(int howto) 453{ 454} 455 456/* Get current clock frequency for the given cpu id. */ 457int 458cpu_est_clockrate(int cpu_id, uint64_t *rate) 459{ 460 register_t reg; 461 uint64_t tsc1, tsc2; 462 463 if (pcpu_find(cpu_id) == NULL || rate == NULL) 464 return (EINVAL); 465 466 /* If we're booting, trust the rate calibrated moments ago. */ 467 if (cold) { 468 *rate = tsc_freq; 469 return (0); 470 } 471 472#ifdef SMP 473 /* Schedule ourselves on the indicated cpu. */ 474 mtx_lock_spin(&sched_lock); 475 sched_bind(curthread, cpu_id); 476 mtx_unlock_spin(&sched_lock); 477#endif 478 479 /* Calibrate by measuring a short delay. */ 480 reg = intr_disable(); 481 tsc1 = rdtsc(); 482 DELAY(1000); 483 tsc2 = rdtsc(); 484 intr_restore(reg); 485 486#ifdef SMP 487 mtx_lock_spin(&sched_lock); 488 sched_unbind(curthread); 489 mtx_unlock_spin(&sched_lock); 490#endif 491 492 /* 493 * Calculate the difference in readings, convert to Mhz, and 494 * subtract 0.5% of the total. Empirical testing has shown that 495 * overhead in DELAY() works out to approximately this value. 496 */ 497 tsc2 -= tsc1; 498 *rate = tsc2 * 1000 - tsc2 * 5; 499 return (0); 500} 501 502/* 503 * Shutdown the CPU as much as possible 504 */ 505void 506cpu_halt(void) 507{ 508 for (;;) 509 __asm__ ("hlt"); 510} 511 512/* 513 * Hook to idle the CPU when possible. In the SMP case we default to 514 * off because a halted cpu will not currently pick up a new thread in the 515 * run queue until the next timer tick. If turned on this will result in 516 * approximately a 4.2% loss in real time performance in buildworld tests 517 * (but improves user and sys times oddly enough), and saves approximately 518 * 5% in power consumption on an idle machine (tests w/2xCPU 1.1GHz P3). 519 * 520 * XXX we need to have a cpu mask of idle cpus and generate an IPI or 521 * otherwise generate some sort of interrupt to wake up cpus sitting in HLT. 522 * Then we can have our cake and eat it too. 523 * 524 * XXX I'm turning it on for SMP as well by default for now. It seems to 525 * help lock contention somewhat, and this is critical for HTT. -Peter 526 */ 527static int cpu_idle_hlt = 1; 528SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW, 529 &cpu_idle_hlt, 0, "Idle loop HLT enable"); 530 531static void 532cpu_idle_default(void) 533{ 534 /* 535 * we must absolutely guarentee that hlt is the 536 * absolute next instruction after sti or we 537 * introduce a timing window. 538 */ 539 __asm __volatile("sti; hlt"); 540} 541 542/* 543 * Note that we have to be careful here to avoid a race between checking 544 * sched_runnable() and actually halting. If we don't do this, we may waste 545 * the time between calling hlt and the next interrupt even though there 546 * is a runnable process. 547 */ 548void 549cpu_idle(void) 550{ 551 552#ifdef SMP 553 if (mp_grab_cpu_hlt()) 554 return; 555#endif 556 if (cpu_idle_hlt) { 557 disable_intr(); 558 if (sched_runnable()) 559 enable_intr(); 560 else 561 (*cpu_idle_hook)(); 562 } 563} 564 565/* Other subsystems (e.g., ACPI) can hook this later. */ 566void (*cpu_idle_hook)(void) = cpu_idle_default; 567 568/* 569 * Clear registers on exec 570 */ 571void 572exec_setregs(td, entry, stack, ps_strings) 573 struct thread *td; 574 u_long entry; 575 u_long stack; 576 u_long ps_strings; 577{ 578 struct trapframe *regs = td->td_frame; 579 struct pcb *pcb = td->td_pcb; 580 581 wrmsr(MSR_FSBASE, 0); 582 wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */ 583 pcb->pcb_fsbase = 0; 584 pcb->pcb_gsbase = 0; 585 load_ds(_udatasel); 586 load_es(_udatasel); 587 load_fs(_udatasel); 588 load_gs(_udatasel); 589 pcb->pcb_ds = _udatasel; 590 pcb->pcb_es = _udatasel; 591 pcb->pcb_fs = _udatasel; 592 pcb->pcb_gs = _udatasel; 593 594 bzero((char *)regs, sizeof(struct trapframe)); 595 regs->tf_rip = entry; 596 regs->tf_rsp = ((stack - 8) & ~0xFul) + 8; 597 regs->tf_rdi = stack; /* argv */ 598 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T); 599 regs->tf_ss = _udatasel; 600 regs->tf_cs = _ucodesel; 601 602 /* 603 * Reset the hardware debug registers if they were in use. 604 * They won't have any meaning for the newly exec'd process. 605 */ 606 if (pcb->pcb_flags & PCB_DBREGS) { 607 pcb->pcb_dr0 = 0; 608 pcb->pcb_dr1 = 0; 609 pcb->pcb_dr2 = 0; 610 pcb->pcb_dr3 = 0; 611 pcb->pcb_dr6 = 0; 612 pcb->pcb_dr7 = 0; 613 if (pcb == PCPU_GET(curpcb)) { 614 /* 615 * Clear the debug registers on the running 616 * CPU, otherwise they will end up affecting 617 * the next process we switch to. 618 */ 619 reset_dbregs(); 620 } 621 pcb->pcb_flags &= ~PCB_DBREGS; 622 } 623 624 /* 625 * Drop the FP state if we hold it, so that the process gets a 626 * clean FP state if it uses the FPU again. 627 */ 628 fpstate_drop(td); 629} 630 631void 632cpu_setregs(void) 633{ 634 register_t cr0; 635 636 cr0 = rcr0(); 637 /* 638 * CR0_MP, CR0_NE and CR0_TS are also set by npx_probe() for the 639 * BSP. See the comments there about why we set them. 640 */ 641 cr0 |= CR0_MP | CR0_NE | CR0_TS | CR0_WP | CR0_AM; 642 load_cr0(cr0); 643} 644 645static int 646sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS) 647{ 648 int error; 649 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 650 req); 651 if (!error && req->newptr) 652 resettodr(); 653 return (error); 654} 655 656SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 657 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 658 659SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set, 660 CTLFLAG_RW, &disable_rtc_set, 0, ""); 661 662SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock, 663 CTLFLAG_RW, &wall_cmos_clock, 0, ""); 664 665/* 666 * Initialize amd64 and configure to run kernel 667 */ 668 669/* 670 * Initialize segments & interrupt table 671 */ 672 673struct user_segment_descriptor gdt[NGDT * MAXCPU];/* global descriptor table */ 674static struct gate_descriptor idt0[NIDT]; 675struct gate_descriptor *idt = &idt0[0]; /* interrupt descriptor table */ 676 677static char dblfault_stack[PAGE_SIZE] __aligned(16); 678 679struct amd64tss common_tss[MAXCPU]; 680 681/* software prototypes -- in more palatable form */ 682struct soft_segment_descriptor gdt_segs[] = { 683/* GNULL_SEL 0 Null Descriptor */ 684{ 0x0, /* segment base address */ 685 0x0, /* length */ 686 0, /* segment type */ 687 0, /* segment descriptor priority level */ 688 0, /* segment descriptor present */ 689 0, /* long */ 690 0, /* default 32 vs 16 bit size */ 691 0 /* limit granularity (byte/page units)*/ }, 692/* GCODE_SEL 1 Code Descriptor for kernel */ 693{ 0x0, /* segment base address */ 694 0xfffff, /* length - all address space */ 695 SDT_MEMERA, /* segment type */ 696 SEL_KPL, /* segment descriptor priority level */ 697 1, /* segment descriptor present */ 698 1, /* long */ 699 0, /* default 32 vs 16 bit size */ 700 1 /* limit granularity (byte/page units)*/ }, 701/* GDATA_SEL 2 Data Descriptor for kernel */ 702{ 0x0, /* segment base address */ 703 0xfffff, /* length - all address space */ 704 SDT_MEMRWA, /* segment type */ 705 SEL_KPL, /* segment descriptor priority level */ 706 1, /* segment descriptor present */ 707 1, /* long */ 708 0, /* default 32 vs 16 bit size */ 709 1 /* limit granularity (byte/page units)*/ }, 710/* GUCODE32_SEL 3 32 bit Code Descriptor for user */ 711{ 0x0, /* segment base address */ 712 0xfffff, /* length - all address space */ 713 SDT_MEMERA, /* segment type */ 714 SEL_UPL, /* segment descriptor priority level */ 715 1, /* segment descriptor present */ 716 0, /* long */ 717 1, /* default 32 vs 16 bit size */ 718 1 /* limit granularity (byte/page units)*/ }, 719/* GUDATA_SEL 4 32/64 bit Data Descriptor for user */ 720{ 0x0, /* segment base address */ 721 0xfffff, /* length - all address space */ 722 SDT_MEMRWA, /* segment type */ 723 SEL_UPL, /* segment descriptor priority level */ 724 1, /* segment descriptor present */ 725 0, /* long */ 726 1, /* default 32 vs 16 bit size */ 727 1 /* limit granularity (byte/page units)*/ }, 728/* GUCODE_SEL 5 64 bit Code Descriptor for user */ 729{ 0x0, /* segment base address */ 730 0xfffff, /* length - all address space */ 731 SDT_MEMERA, /* segment type */ 732 SEL_UPL, /* segment descriptor priority level */ 733 1, /* segment descriptor present */ 734 1, /* long */ 735 0, /* default 32 vs 16 bit size */ 736 1 /* limit granularity (byte/page units)*/ }, 737/* GPROC0_SEL 6 Proc 0 Tss Descriptor */ 738{ 739 0x0, /* segment base address */ 740 sizeof(struct amd64tss)-1,/* length - all address space */ 741 SDT_SYSTSS, /* segment type */ 742 SEL_KPL, /* segment descriptor priority level */ 743 1, /* segment descriptor present */ 744 0, /* long */ 745 0, /* unused - default 32 vs 16 bit size */ 746 0 /* limit granularity (byte/page units)*/ }, 747/* Actually, the TSS is a system descriptor which is double size */ 748{ 0x0, /* segment base address */ 749 0x0, /* length */ 750 0, /* segment type */ 751 0, /* segment descriptor priority level */ 752 0, /* segment descriptor present */ 753 0, /* long */ 754 0, /* default 32 vs 16 bit size */ 755 0 /* limit granularity (byte/page units)*/ }, 756}; 757 758void 759setidt(idx, func, typ, dpl, ist) 760 int idx; 761 inthand_t *func; 762 int typ; 763 int dpl; 764 int ist; 765{ 766 struct gate_descriptor *ip; 767 768 ip = idt + idx; 769 ip->gd_looffset = (uintptr_t)func; 770 ip->gd_selector = GSEL(GCODE_SEL, SEL_KPL); 771 ip->gd_ist = ist; 772 ip->gd_xx = 0; 773 ip->gd_type = typ; 774 ip->gd_dpl = dpl; 775 ip->gd_p = 1; 776 ip->gd_hioffset = ((uintptr_t)func)>>16 ; 777} 778 779#define IDTVEC(name) __CONCAT(X,name) 780 781extern inthand_t 782 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 783 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 784 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 785 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 786 IDTVEC(xmm), IDTVEC(dblfault), 787 IDTVEC(fast_syscall), IDTVEC(fast_syscall32); 788 789void 790sdtossd(sd, ssd) 791 struct user_segment_descriptor *sd; 792 struct soft_segment_descriptor *ssd; 793{ 794 795 ssd->ssd_base = (sd->sd_hibase << 24) | sd->sd_lobase; 796 ssd->ssd_limit = (sd->sd_hilimit << 16) | sd->sd_lolimit; 797 ssd->ssd_type = sd->sd_type; 798 ssd->ssd_dpl = sd->sd_dpl; 799 ssd->ssd_p = sd->sd_p; 800 ssd->ssd_long = sd->sd_long; 801 ssd->ssd_def32 = sd->sd_def32; 802 ssd->ssd_gran = sd->sd_gran; 803} 804 805void 806ssdtosd(ssd, sd) 807 struct soft_segment_descriptor *ssd; 808 struct user_segment_descriptor *sd; 809{ 810 811 sd->sd_lobase = (ssd->ssd_base) & 0xffffff; 812 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xff; 813 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff; 814 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf; 815 sd->sd_type = ssd->ssd_type; 816 sd->sd_dpl = ssd->ssd_dpl; 817 sd->sd_p = ssd->ssd_p; 818 sd->sd_long = ssd->ssd_long; 819 sd->sd_def32 = ssd->ssd_def32; 820 sd->sd_gran = ssd->ssd_gran; 821} 822 823void 824ssdtosyssd(ssd, sd) 825 struct soft_segment_descriptor *ssd; 826 struct system_segment_descriptor *sd; 827{ 828 829 sd->sd_lobase = (ssd->ssd_base) & 0xffffff; 830 sd->sd_hibase = (ssd->ssd_base >> 24) & 0xfffffffffful; 831 sd->sd_lolimit = (ssd->ssd_limit) & 0xffff; 832 sd->sd_hilimit = (ssd->ssd_limit >> 16) & 0xf; 833 sd->sd_type = ssd->ssd_type; 834 sd->sd_dpl = ssd->ssd_dpl; 835 sd->sd_p = ssd->ssd_p; 836 sd->sd_gran = ssd->ssd_gran; 837} 838 839#if !defined(DEV_ATPIC) && defined(DEV_ISA) 840#include <isa/isavar.h> 841u_int 842isa_irq_pending(void) 843{ 844 845 return (0); 846} 847#endif 848 849#define PHYSMAP_SIZE (2 * 8) 850 851u_int basemem; 852 853/* 854 * Populate the (physmap) array with base/bound pairs describing the 855 * available physical memory in the system, then test this memory and 856 * build the phys_avail array describing the actually-available memory. 857 * 858 * If we cannot accurately determine the physical memory map, then use 859 * value from the 0xE801 call, and failing that, the RTC. 860 * 861 * Total memory size may be set by the kernel environment variable 862 * hw.physmem or the compile-time define MAXMEM. 863 * 864 * XXX first should be vm_paddr_t. 865 */ 866static void 867getmemsize(caddr_t kmdp, u_int64_t first) 868{ 869 int i, physmap_idx, pa_indx, da_indx; 870 vm_paddr_t pa, physmap[PHYSMAP_SIZE]; 871 u_long physmem_tunable; 872 pt_entry_t *pte; 873 struct bios_smap *smapbase, *smap, *smapend; 874 u_int32_t smapsize; 875 quad_t dcons_addr, dcons_size; 876 877 bzero(physmap, sizeof(physmap)); 878 basemem = 0; 879 physmap_idx = 0; 880 881 /* 882 * get memory map from INT 15:E820, kindly supplied by the loader. 883 * 884 * subr_module.c says: 885 * "Consumer may safely assume that size value precedes data." 886 * ie: an int32_t immediately precedes smap. 887 */ 888 smapbase = (struct bios_smap *)preload_search_info(kmdp, 889 MODINFO_METADATA | MODINFOMD_SMAP); 890 if (smapbase == NULL) 891 panic("No BIOS smap info from loader!"); 892 893 smapsize = *((u_int32_t *)smapbase - 1); 894 smapend = (struct bios_smap *)((uintptr_t)smapbase + smapsize); 895 896 for (smap = smapbase; smap < smapend; smap++) { 897 if (boothowto & RB_VERBOSE) 898 printf("SMAP type=%02x base=%016lx len=%016lx\n", 899 smap->type, smap->base, smap->length); 900 901 if (smap->type != 0x01) 902 continue; 903 904 if (smap->length == 0) 905 continue; 906 907 for (i = 0; i <= physmap_idx; i += 2) { 908 if (smap->base < physmap[i + 1]) { 909 if (boothowto & RB_VERBOSE) 910 printf( 911 "Overlapping or non-montonic memory region, ignoring second region\n"); 912 continue; 913 } 914 } 915 916 if (smap->base == physmap[physmap_idx + 1]) { 917 physmap[physmap_idx + 1] += smap->length; 918 continue; 919 } 920 921 physmap_idx += 2; 922 if (physmap_idx == PHYSMAP_SIZE) { 923 printf( 924 "Too many segments in the physical address map, giving up\n"); 925 break; 926 } 927 physmap[physmap_idx] = smap->base; 928 physmap[physmap_idx + 1] = smap->base + smap->length; 929 } 930 931 /* 932 * Find the 'base memory' segment for SMP 933 */ 934 basemem = 0; 935 for (i = 0; i <= physmap_idx; i += 2) { 936 if (physmap[i] == 0x00000000) { 937 basemem = physmap[i + 1] / 1024; 938 break; 939 } 940 } 941 if (basemem == 0) 942 panic("BIOS smap did not include a basemem segment!"); 943 944#ifdef SMP 945 /* make hole for AP bootstrap code */ 946 physmap[1] = mp_bootaddress(physmap[1] / 1024); 947#endif 948 949 /* 950 * Maxmem isn't the "maximum memory", it's one larger than the 951 * highest page of the physical address space. It should be 952 * called something like "Maxphyspage". We may adjust this 953 * based on ``hw.physmem'' and the results of the memory test. 954 */ 955 Maxmem = atop(physmap[physmap_idx + 1]); 956 957#ifdef MAXMEM 958 Maxmem = MAXMEM / 4; 959#endif 960 961 if (TUNABLE_ULONG_FETCH("hw.physmem", &physmem_tunable)) 962 Maxmem = atop(physmem_tunable); 963 964 if (atop(physmap[physmap_idx + 1]) != Maxmem && 965 (boothowto & RB_VERBOSE)) 966 printf("Physical memory use set to %ldK\n", Maxmem * 4); 967 968 /* 969 * If Maxmem has been increased beyond what the system has detected, 970 * extend the last memory segment to the new limit. 971 */ 972 if (atop(physmap[physmap_idx + 1]) < Maxmem) 973 physmap[physmap_idx + 1] = ptoa((vm_paddr_t)Maxmem); 974 975 /* call pmap initialization to make new kernel address space */ 976 pmap_bootstrap(&first); 977 978 /* 979 * Size up each available chunk of physical memory. 980 */ 981 physmap[0] = PAGE_SIZE; /* mask off page 0 */ 982 pa_indx = 0; 983 da_indx = 1; 984 phys_avail[pa_indx++] = physmap[0]; 985 phys_avail[pa_indx] = physmap[0]; 986 dump_avail[da_indx] = physmap[0]; 987 pte = CMAP1; 988 989 /* 990 * Get dcons buffer address 991 */ 992 if (getenv_quad("dcons.addr", &dcons_addr) == 0 || 993 getenv_quad("dcons.size", &dcons_size) == 0) 994 dcons_addr = 0; 995 996 /* 997 * physmap is in bytes, so when converting to page boundaries, 998 * round up the start address and round down the end address. 999 */ 1000 for (i = 0; i <= physmap_idx; i += 2) { 1001 vm_paddr_t end; 1002 1003 end = ptoa((vm_paddr_t)Maxmem); 1004 if (physmap[i + 1] < end) 1005 end = trunc_page(physmap[i + 1]); 1006 for (pa = round_page(physmap[i]); pa < end; pa += PAGE_SIZE) { 1007 int tmp, page_bad, full; 1008 int *ptr = (int *)CADDR1; 1009 1010 full = FALSE; 1011 /* 1012 * block out kernel memory as not available. 1013 */ 1014 if (pa >= 0x100000 && pa < first) 1015 goto do_dump_avail; 1016 1017 /* 1018 * block out dcons buffer 1019 */ 1020 if (dcons_addr > 0 1021 && pa >= trunc_page(dcons_addr) 1022 && pa < dcons_addr + dcons_size) 1023 goto do_dump_avail; 1024 1025 page_bad = FALSE; 1026 1027 /* 1028 * map page into kernel: valid, read/write,non-cacheable 1029 */ 1030 *pte = pa | PG_V | PG_RW | PG_N; 1031 invltlb(); 1032 1033 tmp = *(int *)ptr; 1034 /* 1035 * Test for alternating 1's and 0's 1036 */ 1037 *(volatile int *)ptr = 0xaaaaaaaa; 1038 if (*(volatile int *)ptr != 0xaaaaaaaa) 1039 page_bad = TRUE; 1040 /* 1041 * Test for alternating 0's and 1's 1042 */ 1043 *(volatile int *)ptr = 0x55555555; 1044 if (*(volatile int *)ptr != 0x55555555) 1045 page_bad = TRUE; 1046 /* 1047 * Test for all 1's 1048 */ 1049 *(volatile int *)ptr = 0xffffffff; 1050 if (*(volatile int *)ptr != 0xffffffff) 1051 page_bad = TRUE; 1052 /* 1053 * Test for all 0's 1054 */ 1055 *(volatile int *)ptr = 0x0; 1056 if (*(volatile int *)ptr != 0x0) 1057 page_bad = TRUE; 1058 /* 1059 * Restore original value. 1060 */ 1061 *(int *)ptr = tmp; 1062 1063 /* 1064 * Adjust array of valid/good pages. 1065 */ 1066 if (page_bad == TRUE) 1067 continue; 1068 /* 1069 * If this good page is a continuation of the 1070 * previous set of good pages, then just increase 1071 * the end pointer. Otherwise start a new chunk. 1072 * Note that "end" points one higher than end, 1073 * making the range >= start and < end. 1074 * If we're also doing a speculative memory 1075 * test and we at or past the end, bump up Maxmem 1076 * so that we keep going. The first bad page 1077 * will terminate the loop. 1078 */ 1079 if (phys_avail[pa_indx] == pa) { 1080 phys_avail[pa_indx] += PAGE_SIZE; 1081 } else { 1082 pa_indx++; 1083 if (pa_indx == PHYS_AVAIL_ARRAY_END) { 1084 printf( 1085 "Too many holes in the physical address space, giving up\n"); 1086 pa_indx--; 1087 full = TRUE; 1088 goto do_dump_avail; 1089 } 1090 phys_avail[pa_indx++] = pa; /* start */ 1091 phys_avail[pa_indx] = pa + PAGE_SIZE; /* end */ 1092 } 1093 physmem++; 1094do_dump_avail: 1095 if (dump_avail[da_indx] == pa) { 1096 dump_avail[da_indx] += PAGE_SIZE; 1097 } else { 1098 da_indx++; 1099 if (da_indx == DUMP_AVAIL_ARRAY_END) { 1100 da_indx--; 1101 goto do_next; 1102 } 1103 dump_avail[da_indx++] = pa; /* start */ 1104 dump_avail[da_indx] = pa + PAGE_SIZE; /* end */ 1105 } 1106do_next: 1107 if (full) 1108 break; 1109 } 1110 } 1111 *pte = 0; 1112 invltlb(); 1113 1114 /* 1115 * XXX 1116 * The last chunk must contain at least one page plus the message 1117 * buffer to avoid complicating other code (message buffer address 1118 * calculation, etc.). 1119 */ 1120 while (phys_avail[pa_indx - 1] + PAGE_SIZE + 1121 round_page(MSGBUF_SIZE) >= phys_avail[pa_indx]) { 1122 physmem -= atop(phys_avail[pa_indx] - phys_avail[pa_indx - 1]); 1123 phys_avail[pa_indx--] = 0; 1124 phys_avail[pa_indx--] = 0; 1125 } 1126 1127 Maxmem = atop(phys_avail[pa_indx]); 1128 1129 /* Trim off space for the message buffer. */ 1130 phys_avail[pa_indx] -= round_page(MSGBUF_SIZE); 1131 1132 avail_end = phys_avail[pa_indx]; 1133} 1134 1135u_int64_t 1136hammer_time(u_int64_t modulep, u_int64_t physfree) 1137{ 1138 caddr_t kmdp; 1139 int gsel_tss, off, x; 1140 struct pcpu *pc; 1141 u_int64_t msr; 1142 char *env; 1143 1144#ifdef DEV_ISA 1145 /* Preemptively mask the atpics and leave them shut down */ 1146 outb(IO_ICU1 + ICU_IMR_OFFSET, 0xff); 1147 outb(IO_ICU2 + ICU_IMR_OFFSET, 0xff); 1148#else 1149#error "have you forgotten the isa device?"; 1150#endif 1151 1152 thread0.td_kstack = physfree + KERNBASE; 1153 bzero((void *)thread0.td_kstack, KSTACK_PAGES * PAGE_SIZE); 1154 physfree += KSTACK_PAGES * PAGE_SIZE; 1155 thread0.td_pcb = (struct pcb *) 1156 (thread0.td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1; 1157 1158 /* 1159 * This may be done better later if it gets more high level 1160 * components in it. If so just link td->td_proc here. 1161 */ 1162 proc_linkup(&proc0, &ksegrp0, &thread0); 1163 1164 preload_metadata = (caddr_t)(uintptr_t)(modulep + KERNBASE); 1165 preload_bootstrap_relocate(KERNBASE); 1166 kmdp = preload_search_by_type("elf kernel"); 1167 if (kmdp == NULL) 1168 kmdp = preload_search_by_type("elf64 kernel"); 1169 boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int); 1170 kern_envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *) + KERNBASE; 1171#ifdef DDB 1172 ksym_start = MD_FETCH(kmdp, MODINFOMD_SSYM, uintptr_t); 1173 ksym_end = MD_FETCH(kmdp, MODINFOMD_ESYM, uintptr_t); 1174#endif 1175 1176 /* Init basic tunables, hz etc */ 1177 init_param1(); 1178 1179 /* 1180 * make gdt memory segments 1181 */ 1182 gdt_segs[GPROC0_SEL].ssd_base = (uintptr_t)&common_tss[0]; 1183 1184 for (x = 0; x < NGDT; x++) { 1185 if (x != GPROC0_SEL && x != (GPROC0_SEL + 1)) 1186 ssdtosd(&gdt_segs[x], &gdt[x]); 1187 } 1188 ssdtosyssd(&gdt_segs[GPROC0_SEL], 1189 (struct system_segment_descriptor *)&gdt[GPROC0_SEL]); 1190 1191 r_gdt.rd_limit = NGDT * sizeof(gdt[0]) - 1; 1192 r_gdt.rd_base = (long) gdt; 1193 lgdt(&r_gdt); 1194 pc = &__pcpu[0]; 1195 1196 wrmsr(MSR_FSBASE, 0); /* User value */ 1197 wrmsr(MSR_GSBASE, (u_int64_t)pc); 1198 wrmsr(MSR_KGSBASE, 0); /* User value while in the kernel */ 1199 1200 pcpu_init(pc, 0, sizeof(struct pcpu)); 1201 PCPU_SET(prvspace, pc); 1202 PCPU_SET(curthread, &thread0); 1203 PCPU_SET(curpcb, thread0.td_pcb); 1204 PCPU_SET(tssp, &common_tss[0]); 1205 1206 /* 1207 * Initialize mutexes. 1208 * 1209 * icu_lock: in order to allow an interrupt to occur in a critical 1210 * section, to set pcpu->ipending (etc...) properly, we 1211 * must be able to get the icu lock, so it can't be 1212 * under witness. 1213 */ 1214 mutex_init(); 1215 mtx_init(&clock_lock, "clk", NULL, MTX_SPIN); 1216 mtx_init(&icu_lock, "icu", NULL, MTX_SPIN | MTX_NOWITNESS); 1217 1218 /* exceptions */ 1219 for (x = 0; x < NIDT; x++) 1220 setidt(x, &IDTVEC(rsvd), SDT_SYSIGT, SEL_KPL, 0); 1221 setidt(IDT_DE, &IDTVEC(div), SDT_SYSIGT, SEL_KPL, 0); 1222 setidt(IDT_DB, &IDTVEC(dbg), SDT_SYSIGT, SEL_KPL, 0); 1223 setidt(IDT_NMI, &IDTVEC(nmi), SDT_SYSIGT, SEL_KPL, 0); 1224 setidt(IDT_BP, &IDTVEC(bpt), SDT_SYSIGT, SEL_UPL, 0); 1225 setidt(IDT_OF, &IDTVEC(ofl), SDT_SYSIGT, SEL_KPL, 0); 1226 setidt(IDT_BR, &IDTVEC(bnd), SDT_SYSIGT, SEL_KPL, 0); 1227 setidt(IDT_UD, &IDTVEC(ill), SDT_SYSIGT, SEL_KPL, 0); 1228 setidt(IDT_NM, &IDTVEC(dna), SDT_SYSIGT, SEL_KPL, 0); 1229 setidt(IDT_DF, &IDTVEC(dblfault), SDT_SYSIGT, SEL_KPL, 1); 1230 setidt(IDT_FPUGP, &IDTVEC(fpusegm), SDT_SYSIGT, SEL_KPL, 0); 1231 setidt(IDT_TS, &IDTVEC(tss), SDT_SYSIGT, SEL_KPL, 0); 1232 setidt(IDT_NP, &IDTVEC(missing), SDT_SYSIGT, SEL_KPL, 0); 1233 setidt(IDT_SS, &IDTVEC(stk), SDT_SYSIGT, SEL_KPL, 0); 1234 setidt(IDT_GP, &IDTVEC(prot), SDT_SYSIGT, SEL_KPL, 0); 1235 setidt(IDT_PF, &IDTVEC(page), SDT_SYSIGT, SEL_KPL, 0); 1236 setidt(IDT_MF, &IDTVEC(fpu), SDT_SYSIGT, SEL_KPL, 0); 1237 setidt(IDT_AC, &IDTVEC(align), SDT_SYSIGT, SEL_KPL, 0); 1238 setidt(IDT_MC, &IDTVEC(mchk), SDT_SYSIGT, SEL_KPL, 0); 1239 setidt(IDT_XF, &IDTVEC(xmm), SDT_SYSIGT, SEL_KPL, 0); 1240 1241 r_idt.rd_limit = sizeof(idt0) - 1; 1242 r_idt.rd_base = (long) idt; 1243 lidt(&r_idt); 1244 1245 /* 1246 * Initialize the console before we print anything out. 1247 */ 1248 cninit(); 1249 1250#ifdef DEV_ATPIC 1251 elcr_probe(); 1252 atpic_startup(); 1253#endif 1254 1255 kdb_init(); 1256 1257#ifdef KDB 1258 if (boothowto & RB_KDB) 1259 kdb_enter("Boot flags requested debugger"); 1260#endif 1261 1262 identify_cpu(); /* Final stage of CPU initialization */ 1263 initializecpu(); /* Initialize CPU registers */ 1264 1265 /* make an initial tss so cpu can get interrupt stack on syscall! */ 1266 common_tss[0].tss_rsp0 = thread0.td_kstack + \ 1267 KSTACK_PAGES * PAGE_SIZE - sizeof(struct pcb); 1268 /* Ensure the stack is aligned to 16 bytes */ 1269 common_tss[0].tss_rsp0 &= ~0xFul; 1270 PCPU_SET(rsp0, common_tss[0].tss_rsp0); 1271 1272 /* doublefault stack space, runs on ist1 */ 1273 common_tss[0].tss_ist1 = (long)&dblfault_stack[sizeof(dblfault_stack)]; 1274 1275 /* Set the IO permission bitmap (empty due to tss seg limit) */ 1276 common_tss[0].tss_iobase = sizeof(struct amd64tss); 1277 1278 gsel_tss = GSEL(GPROC0_SEL, SEL_KPL); 1279 ltr(gsel_tss); 1280 1281 /* Set up the fast syscall stuff */ 1282 msr = rdmsr(MSR_EFER) | EFER_SCE; 1283 wrmsr(MSR_EFER, msr); 1284 wrmsr(MSR_LSTAR, (u_int64_t)IDTVEC(fast_syscall)); 1285 wrmsr(MSR_CSTAR, (u_int64_t)IDTVEC(fast_syscall32)); 1286 msr = ((u_int64_t)GSEL(GCODE_SEL, SEL_KPL) << 32) | 1287 ((u_int64_t)GSEL(GUCODE32_SEL, SEL_UPL) << 48); 1288 wrmsr(MSR_STAR, msr); 1289 wrmsr(MSR_SF_MASK, PSL_NT|PSL_T|PSL_I|PSL_C|PSL_D); 1290 1291 getmemsize(kmdp, physfree); 1292 init_param2(physmem); 1293 1294 /* now running on new page tables, configured,and u/iom is accessible */ 1295 1296 /* Map the message buffer. */ 1297 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE) 1298 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off); 1299 1300 msgbufinit(msgbufp, MSGBUF_SIZE); 1301 fpuinit(); 1302 1303 /* transfer to user mode */ 1304 1305 _ucodesel = GSEL(GUCODE_SEL, SEL_UPL); 1306 _udatasel = GSEL(GUDATA_SEL, SEL_UPL); 1307 _ucode32sel = GSEL(GUCODE32_SEL, SEL_UPL); 1308 1309 /* setup proc 0's pcb */ 1310 thread0.td_pcb->pcb_flags = 0; /* XXXKSE */ 1311 thread0.td_pcb->pcb_cr3 = KPML4phys; 1312 thread0.td_frame = &proc0_tf; 1313 1314 env = getenv("kernelname"); 1315 if (env != NULL) 1316 strlcpy(kernelname, env, sizeof(kernelname)); 1317 1318 /* Location of kernel stack for locore */ 1319 return ((u_int64_t)thread0.td_pcb); 1320} 1321 1322void 1323cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size) 1324{ 1325 1326 pcpu->pc_acpi_id = 0xffffffff; 1327} 1328 1329void 1330spinlock_enter(void) 1331{ 1332 struct thread *td; 1333 1334 td = curthread; 1335 if (td->td_md.md_spinlock_count == 0) 1336 td->td_md.md_saved_flags = intr_disable(); 1337 td->td_md.md_spinlock_count++; 1338 critical_enter(); 1339} 1340 1341void 1342spinlock_exit(void) 1343{ 1344 struct thread *td; 1345 1346 td = curthread; 1347 critical_exit(); 1348 td->td_md.md_spinlock_count--; 1349 if (td->td_md.md_spinlock_count == 0) 1350 intr_restore(td->td_md.md_saved_flags); 1351} 1352 1353/* 1354 * Construct a PCB from a trapframe. This is called from kdb_trap() where 1355 * we want to start a backtrace from the function that caused us to enter 1356 * the debugger. We have the context in the trapframe, but base the trace 1357 * on the PCB. The PCB doesn't have to be perfect, as long as it contains 1358 * enough for a backtrace. 1359 */ 1360void 1361makectx(struct trapframe *tf, struct pcb *pcb) 1362{ 1363 1364 pcb->pcb_r12 = tf->tf_r12; 1365 pcb->pcb_r13 = tf->tf_r13; 1366 pcb->pcb_r14 = tf->tf_r14; 1367 pcb->pcb_r15 = tf->tf_r15; 1368 pcb->pcb_rbp = tf->tf_rbp; 1369 pcb->pcb_rbx = tf->tf_rbx; 1370 pcb->pcb_rip = tf->tf_rip; 1371 pcb->pcb_rsp = (ISPL(tf->tf_cs)) ? tf->tf_rsp : (long)(tf + 1) - 8; 1372} 1373 1374int 1375ptrace_set_pc(struct thread *td, unsigned long addr) 1376{ 1377 td->td_frame->tf_rip = addr; 1378 return (0); 1379} 1380 1381int 1382ptrace_single_step(struct thread *td) 1383{ 1384 td->td_frame->tf_rflags |= PSL_T; 1385 return (0); 1386} 1387 1388int 1389ptrace_clear_single_step(struct thread *td) 1390{ 1391 td->td_frame->tf_rflags &= ~PSL_T; 1392 return (0); 1393} 1394 1395int 1396fill_regs(struct thread *td, struct reg *regs) 1397{ 1398 struct trapframe *tp; 1399 1400 tp = td->td_frame; 1401 regs->r_r15 = tp->tf_r15; 1402 regs->r_r14 = tp->tf_r14; 1403 regs->r_r13 = tp->tf_r13; 1404 regs->r_r12 = tp->tf_r12; 1405 regs->r_r11 = tp->tf_r11; 1406 regs->r_r10 = tp->tf_r10; 1407 regs->r_r9 = tp->tf_r9; 1408 regs->r_r8 = tp->tf_r8; 1409 regs->r_rdi = tp->tf_rdi; 1410 regs->r_rsi = tp->tf_rsi; 1411 regs->r_rbp = tp->tf_rbp; 1412 regs->r_rbx = tp->tf_rbx; 1413 regs->r_rdx = tp->tf_rdx; 1414 regs->r_rcx = tp->tf_rcx; 1415 regs->r_rax = tp->tf_rax; 1416 regs->r_rip = tp->tf_rip; 1417 regs->r_cs = tp->tf_cs; 1418 regs->r_rflags = tp->tf_rflags; 1419 regs->r_rsp = tp->tf_rsp; 1420 regs->r_ss = tp->tf_ss; 1421 return (0); 1422} 1423 1424int 1425set_regs(struct thread *td, struct reg *regs) 1426{ 1427 struct trapframe *tp; 1428 register_t rflags; 1429 1430 tp = td->td_frame; 1431 rflags = regs->r_rflags & 0xffffffff; 1432 if (!EFL_SECURE(rflags, tp->tf_rflags) || !CS_SECURE(regs->r_cs)) 1433 return (EINVAL); 1434 tp->tf_r15 = regs->r_r15; 1435 tp->tf_r14 = regs->r_r14; 1436 tp->tf_r13 = regs->r_r13; 1437 tp->tf_r12 = regs->r_r12; 1438 tp->tf_r11 = regs->r_r11; 1439 tp->tf_r10 = regs->r_r10; 1440 tp->tf_r9 = regs->r_r9; 1441 tp->tf_r8 = regs->r_r8; 1442 tp->tf_rdi = regs->r_rdi; 1443 tp->tf_rsi = regs->r_rsi; 1444 tp->tf_rbp = regs->r_rbp; 1445 tp->tf_rbx = regs->r_rbx; 1446 tp->tf_rdx = regs->r_rdx; 1447 tp->tf_rcx = regs->r_rcx; 1448 tp->tf_rax = regs->r_rax; 1449 tp->tf_rip = regs->r_rip; 1450 tp->tf_cs = regs->r_cs; 1451 tp->tf_rflags = rflags; 1452 tp->tf_rsp = regs->r_rsp; 1453 tp->tf_ss = regs->r_ss; 1454 td->td_pcb->pcb_flags |= PCB_FULLCTX; 1455 return (0); 1456} 1457 1458/* XXX check all this stuff! */ 1459/* externalize from sv_xmm */ 1460static void 1461fill_fpregs_xmm(struct savefpu *sv_xmm, struct fpreg *fpregs) 1462{ 1463 struct envxmm *penv_fpreg = (struct envxmm *)&fpregs->fpr_env; 1464 struct envxmm *penv_xmm = &sv_xmm->sv_env; 1465 int i; 1466 1467 /* pcb -> fpregs */ 1468 bzero(fpregs, sizeof(*fpregs)); 1469 1470 /* FPU control/status */ 1471 penv_fpreg->en_cw = penv_xmm->en_cw; 1472 penv_fpreg->en_sw = penv_xmm->en_sw; 1473 penv_fpreg->en_tw = penv_xmm->en_tw; 1474 penv_fpreg->en_opcode = penv_xmm->en_opcode; 1475 penv_fpreg->en_rip = penv_xmm->en_rip; 1476 penv_fpreg->en_rdp = penv_xmm->en_rdp; 1477 penv_fpreg->en_mxcsr = penv_xmm->en_mxcsr; 1478 penv_fpreg->en_mxcsr_mask = penv_xmm->en_mxcsr_mask; 1479 1480 /* FPU registers */ 1481 for (i = 0; i < 8; ++i) 1482 bcopy(sv_xmm->sv_fp[i].fp_acc.fp_bytes, fpregs->fpr_acc[i], 10); 1483 1484 /* SSE registers */ 1485 for (i = 0; i < 16; ++i) 1486 bcopy(sv_xmm->sv_xmm[i].xmm_bytes, fpregs->fpr_xacc[i], 16); 1487} 1488 1489/* internalize from fpregs into sv_xmm */ 1490static void 1491set_fpregs_xmm(struct fpreg *fpregs, struct savefpu *sv_xmm) 1492{ 1493 struct envxmm *penv_xmm = &sv_xmm->sv_env; 1494 struct envxmm *penv_fpreg = (struct envxmm *)&fpregs->fpr_env; 1495 int i; 1496 1497 /* fpregs -> pcb */ 1498 /* FPU control/status */ 1499 penv_xmm->en_cw = penv_fpreg->en_cw; 1500 penv_xmm->en_sw = penv_fpreg->en_sw; 1501 penv_xmm->en_tw = penv_fpreg->en_tw; 1502 penv_xmm->en_opcode = penv_fpreg->en_opcode; 1503 penv_xmm->en_rip = penv_fpreg->en_rip; 1504 penv_xmm->en_rdp = penv_fpreg->en_rdp; 1505 penv_xmm->en_mxcsr = penv_fpreg->en_mxcsr; 1506 penv_xmm->en_mxcsr_mask = penv_fpreg->en_mxcsr_mask; 1507 1508 /* FPU registers */ 1509 for (i = 0; i < 8; ++i) 1510 bcopy(fpregs->fpr_acc[i], sv_xmm->sv_fp[i].fp_acc.fp_bytes, 10); 1511 1512 /* SSE registers */ 1513 for (i = 0; i < 16; ++i) 1514 bcopy(fpregs->fpr_xacc[i], sv_xmm->sv_xmm[i].xmm_bytes, 16); 1515} 1516 1517/* externalize from td->pcb */ 1518int 1519fill_fpregs(struct thread *td, struct fpreg *fpregs) 1520{ 1521 1522 fill_fpregs_xmm(&td->td_pcb->pcb_save, fpregs); 1523 return (0); 1524} 1525 1526/* internalize to td->pcb */ 1527int 1528set_fpregs(struct thread *td, struct fpreg *fpregs) 1529{ 1530 1531 set_fpregs_xmm(fpregs, &td->td_pcb->pcb_save); 1532 return (0); 1533} 1534 1535/* 1536 * Get machine context. 1537 */ 1538int 1539get_mcontext(struct thread *td, mcontext_t *mcp, int flags) 1540{ 1541 struct trapframe *tp; 1542 1543 tp = td->td_frame; 1544 PROC_LOCK(curthread->td_proc); 1545 mcp->mc_onstack = sigonstack(tp->tf_rsp); 1546 PROC_UNLOCK(curthread->td_proc); 1547 mcp->mc_r15 = tp->tf_r15; 1548 mcp->mc_r14 = tp->tf_r14; 1549 mcp->mc_r13 = tp->tf_r13; 1550 mcp->mc_r12 = tp->tf_r12; 1551 mcp->mc_r11 = tp->tf_r11; 1552 mcp->mc_r10 = tp->tf_r10; 1553 mcp->mc_r9 = tp->tf_r9; 1554 mcp->mc_r8 = tp->tf_r8; 1555 mcp->mc_rdi = tp->tf_rdi; 1556 mcp->mc_rsi = tp->tf_rsi; 1557 mcp->mc_rbp = tp->tf_rbp; 1558 mcp->mc_rbx = tp->tf_rbx; 1559 mcp->mc_rcx = tp->tf_rcx; 1560 if (flags & GET_MC_CLEAR_RET) { 1561 mcp->mc_rax = 0; 1562 mcp->mc_rdx = 0; 1563 } else { 1564 mcp->mc_rax = tp->tf_rax; 1565 mcp->mc_rdx = tp->tf_rdx; 1566 } 1567 mcp->mc_rip = tp->tf_rip; 1568 mcp->mc_cs = tp->tf_cs; 1569 mcp->mc_rflags = tp->tf_rflags; 1570 mcp->mc_rsp = tp->tf_rsp; 1571 mcp->mc_ss = tp->tf_ss; 1572 mcp->mc_len = sizeof(*mcp); 1573 get_fpcontext(td, mcp); 1574 return (0); 1575} 1576 1577/* 1578 * Set machine context. 1579 * 1580 * However, we don't set any but the user modifiable flags, and we won't 1581 * touch the cs selector. 1582 */ 1583int 1584set_mcontext(struct thread *td, const mcontext_t *mcp) 1585{ 1586 struct trapframe *tp; 1587 long rflags; 1588 int ret; 1589 1590 tp = td->td_frame; 1591 if (mcp->mc_len != sizeof(*mcp)) 1592 return (EINVAL); 1593 rflags = (mcp->mc_rflags & PSL_USERCHANGE) | 1594 (tp->tf_rflags & ~PSL_USERCHANGE); 1595 ret = set_fpcontext(td, mcp); 1596 if (ret != 0) 1597 return (ret); 1598 tp->tf_r15 = mcp->mc_r15; 1599 tp->tf_r14 = mcp->mc_r14; 1600 tp->tf_r13 = mcp->mc_r13; 1601 tp->tf_r12 = mcp->mc_r12; 1602 tp->tf_r11 = mcp->mc_r11; 1603 tp->tf_r10 = mcp->mc_r10; 1604 tp->tf_r9 = mcp->mc_r9; 1605 tp->tf_r8 = mcp->mc_r8; 1606 tp->tf_rdi = mcp->mc_rdi; 1607 tp->tf_rsi = mcp->mc_rsi; 1608 tp->tf_rbp = mcp->mc_rbp; 1609 tp->tf_rbx = mcp->mc_rbx; 1610 tp->tf_rdx = mcp->mc_rdx; 1611 tp->tf_rcx = mcp->mc_rcx; 1612 tp->tf_rax = mcp->mc_rax; 1613 tp->tf_rip = mcp->mc_rip; 1614 tp->tf_rflags = rflags; 1615 tp->tf_rsp = mcp->mc_rsp; 1616 tp->tf_ss = mcp->mc_ss; 1617 td->td_pcb->pcb_flags |= PCB_FULLCTX; 1618 return (0); 1619} 1620 1621static void 1622get_fpcontext(struct thread *td, mcontext_t *mcp) 1623{ 1624 1625 mcp->mc_ownedfp = fpugetregs(td, (struct savefpu *)&mcp->mc_fpstate); 1626 mcp->mc_fpformat = fpuformat(); 1627} 1628 1629static int 1630set_fpcontext(struct thread *td, const mcontext_t *mcp) 1631{ 1632 1633 if (mcp->mc_fpformat == _MC_FPFMT_NODEV) 1634 return (0); 1635 else if (mcp->mc_fpformat != _MC_FPFMT_XMM) 1636 return (EINVAL); 1637 else if (mcp->mc_ownedfp == _MC_FPOWNED_NONE) 1638 /* We don't care what state is left in the FPU or PCB. */ 1639 fpstate_drop(td); 1640 else if (mcp->mc_ownedfp == _MC_FPOWNED_FPU || 1641 mcp->mc_ownedfp == _MC_FPOWNED_PCB) { 1642 /* 1643 * XXX we violate the dubious requirement that fpusetregs() 1644 * be called with interrupts disabled. 1645 * XXX obsolete on trap-16 systems? 1646 */ 1647 fpusetregs(td, (struct savefpu *)&mcp->mc_fpstate); 1648 } else 1649 return (EINVAL); 1650 return (0); 1651} 1652 1653void 1654fpstate_drop(struct thread *td) 1655{ 1656 register_t s; 1657 1658 s = intr_disable(); 1659 if (PCPU_GET(fpcurthread) == td) 1660 fpudrop(); 1661 /* 1662 * XXX force a full drop of the fpu. The above only drops it if we 1663 * owned it. 1664 * 1665 * XXX I don't much like fpugetregs()'s semantics of doing a full 1666 * drop. Dropping only to the pcb matches fnsave's behaviour. 1667 * We only need to drop to !PCB_INITDONE in sendsig(). But 1668 * sendsig() is the only caller of fpugetregs()... perhaps we just 1669 * have too many layers. 1670 */ 1671 curthread->td_pcb->pcb_flags &= ~PCB_FPUINITDONE; 1672 intr_restore(s); 1673} 1674 1675int 1676fill_dbregs(struct thread *td, struct dbreg *dbregs) 1677{ 1678 struct pcb *pcb; 1679 1680 if (td == NULL) { 1681 dbregs->dr[0] = rdr0(); 1682 dbregs->dr[1] = rdr1(); 1683 dbregs->dr[2] = rdr2(); 1684 dbregs->dr[3] = rdr3(); 1685 dbregs->dr[6] = rdr6(); 1686 dbregs->dr[7] = rdr7(); 1687 } else { 1688 pcb = td->td_pcb; 1689 dbregs->dr[0] = pcb->pcb_dr0; 1690 dbregs->dr[1] = pcb->pcb_dr1; 1691 dbregs->dr[2] = pcb->pcb_dr2; 1692 dbregs->dr[3] = pcb->pcb_dr3; 1693 dbregs->dr[6] = pcb->pcb_dr6; 1694 dbregs->dr[7] = pcb->pcb_dr7; 1695 } 1696 dbregs->dr[4] = 0; 1697 dbregs->dr[5] = 0; 1698 dbregs->dr[8] = 0; 1699 dbregs->dr[9] = 0; 1700 dbregs->dr[10] = 0; 1701 dbregs->dr[11] = 0; 1702 dbregs->dr[12] = 0; 1703 dbregs->dr[13] = 0; 1704 dbregs->dr[14] = 0; 1705 dbregs->dr[15] = 0; 1706 return (0); 1707} 1708 1709int 1710set_dbregs(struct thread *td, struct dbreg *dbregs) 1711{ 1712 struct pcb *pcb; 1713 int i; 1714 u_int64_t mask1, mask2; 1715 1716 if (td == NULL) { 1717 load_dr0(dbregs->dr[0]); 1718 load_dr1(dbregs->dr[1]); 1719 load_dr2(dbregs->dr[2]); 1720 load_dr3(dbregs->dr[3]); 1721 load_dr6(dbregs->dr[6]); 1722 load_dr7(dbregs->dr[7]); 1723 } else { 1724 /* 1725 * Don't let an illegal value for dr7 get set. Specifically, 1726 * check for undefined settings. Setting these bit patterns 1727 * result in undefined behaviour and can lead to an unexpected 1728 * TRCTRAP or a general protection fault right here. 1729 */ 1730 for (i = 0, mask1 = 0x3<<16, mask2 = 0x2<<16; i < 8; 1731 i++, mask1 <<= 2, mask2 <<= 2) 1732 if ((dbregs->dr[7] & mask1) == mask2) 1733 return (EINVAL); 1734 1735 pcb = td->td_pcb; 1736 1737 /* 1738 * Don't let a process set a breakpoint that is not within the 1739 * process's address space. If a process could do this, it 1740 * could halt the system by setting a breakpoint in the kernel 1741 * (if ddb was enabled). Thus, we need to check to make sure 1742 * that no breakpoints are being enabled for addresses outside 1743 * process's address space, unless, perhaps, we were called by 1744 * uid 0. 1745 * 1746 * XXX - what about when the watched area of the user's 1747 * address space is written into from within the kernel 1748 * ... wouldn't that still cause a breakpoint to be generated 1749 * from within kernel mode? 1750 */ 1751 1752 if (suser(td) != 0) { 1753 if (dbregs->dr[7] & 0x3) { 1754 /* dr0 is enabled */ 1755 if (dbregs->dr[0] >= VM_MAXUSER_ADDRESS) 1756 return (EINVAL); 1757 } 1758 if (dbregs->dr[7] & 0x3<<2) { 1759 /* dr1 is enabled */ 1760 if (dbregs->dr[1] >= VM_MAXUSER_ADDRESS) 1761 return (EINVAL); 1762 } 1763 if (dbregs->dr[7] & 0x3<<4) { 1764 /* dr2 is enabled */ 1765 if (dbregs->dr[2] >= VM_MAXUSER_ADDRESS) 1766 return (EINVAL); 1767 } 1768 if (dbregs->dr[7] & 0x3<<6) { 1769 /* dr3 is enabled */ 1770 if (dbregs->dr[3] >= VM_MAXUSER_ADDRESS) 1771 return (EINVAL); 1772 } 1773 } 1774 1775 pcb->pcb_dr0 = dbregs->dr[0]; 1776 pcb->pcb_dr1 = dbregs->dr[1]; 1777 pcb->pcb_dr2 = dbregs->dr[2]; 1778 pcb->pcb_dr3 = dbregs->dr[3]; 1779 pcb->pcb_dr6 = dbregs->dr[6]; 1780 pcb->pcb_dr7 = dbregs->dr[7]; 1781 1782 pcb->pcb_flags |= PCB_DBREGS; 1783 } 1784 1785 return (0); 1786} 1787 1788void 1789reset_dbregs(void) 1790{ 1791 1792 load_dr7(0); /* Turn off the control bits first */ 1793 load_dr0(0); 1794 load_dr1(0); 1795 load_dr2(0); 1796 load_dr3(0); 1797 load_dr6(0); 1798} 1799 1800/* 1801 * Return > 0 if a hardware breakpoint has been hit, and the 1802 * breakpoint was in user space. Return 0, otherwise. 1803 */ 1804int 1805user_dbreg_trap(void) 1806{ 1807 u_int64_t dr7, dr6; /* debug registers dr6 and dr7 */ 1808 u_int64_t bp; /* breakpoint bits extracted from dr6 */ 1809 int nbp; /* number of breakpoints that triggered */ 1810 caddr_t addr[4]; /* breakpoint addresses */ 1811 int i; 1812 1813 dr7 = rdr7(); 1814 if ((dr7 & 0x000000ff) == 0) { 1815 /* 1816 * all GE and LE bits in the dr7 register are zero, 1817 * thus the trap couldn't have been caused by the 1818 * hardware debug registers 1819 */ 1820 return 0; 1821 } 1822 1823 nbp = 0; 1824 dr6 = rdr6(); 1825 bp = dr6 & 0x0000000f; 1826 1827 if (!bp) { 1828 /* 1829 * None of the breakpoint bits are set meaning this 1830 * trap was not caused by any of the debug registers 1831 */ 1832 return 0; 1833 } 1834 1835 /* 1836 * at least one of the breakpoints were hit, check to see 1837 * which ones and if any of them are user space addresses 1838 */ 1839 1840 if (bp & 0x01) { 1841 addr[nbp++] = (caddr_t)rdr0(); 1842 } 1843 if (bp & 0x02) { 1844 addr[nbp++] = (caddr_t)rdr1(); 1845 } 1846 if (bp & 0x04) { 1847 addr[nbp++] = (caddr_t)rdr2(); 1848 } 1849 if (bp & 0x08) { 1850 addr[nbp++] = (caddr_t)rdr3(); 1851 } 1852 1853 for (i=0; i<nbp; i++) { 1854 if (addr[i] < 1855 (caddr_t)VM_MAXUSER_ADDRESS) { 1856 /* 1857 * addr[i] is in user space 1858 */ 1859 return nbp; 1860 } 1861 } 1862 1863 /* 1864 * None of the breakpoints are in user space. 1865 */ 1866 return 0; 1867} 1868 1869#ifdef KDB 1870 1871/* 1872 * Provide inb() and outb() as functions. They are normally only 1873 * available as macros calling inlined functions, thus cannot be 1874 * called from the debugger. 1875 * 1876 * The actual code is stolen from <machine/cpufunc.h>, and de-inlined. 1877 */ 1878 1879#undef inb 1880#undef outb 1881 1882/* silence compiler warnings */ 1883u_char inb(u_int); 1884void outb(u_int, u_char); 1885 1886u_char 1887inb(u_int port) 1888{ 1889 u_char data; 1890 /* 1891 * We use %%dx and not %1 here because i/o is done at %dx and not at 1892 * %edx, while gcc generates inferior code (movw instead of movl) 1893 * if we tell it to load (u_short) port. 1894 */ 1895 __asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port)); 1896 return (data); 1897} 1898 1899void 1900outb(u_int port, u_char data) 1901{ 1902 u_char al; 1903 /* 1904 * Use an unnecessary assignment to help gcc's register allocator. 1905 * This make a large difference for gcc-1.40 and a tiny difference 1906 * for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for 1907 * best results. gcc-2.6.0 can't handle this. 1908 */ 1909 al = data; 1910 __asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port)); 1911} 1912 1913#endif /* KDB */ 1914