1 /* $NetBSD: lapic.c,v 1.93 2025/05/02 07:08:11 imil Exp $ */ 2 3 /*- 4 * Copyright (c) 2000, 2008, 2020 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by RedBack Networks Inc. 9 * 10 * Author: Bill Sommerfeld 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 23 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31 * POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 __KERNEL_RCSID(0, "$NetBSD: lapic.c,v 1.93 2025/05/02 07:08:11 imil Exp $"); 36 37 #include "acpica.h" 38 #include "ioapic.h" 39 #include "opt_acpi.h" 40 #include "opt_ddb.h" 41 #include "opt_mpbios.h" /* for MPDEBUG */ 42 #include "opt_multiprocessor.h" 43 #include "opt_ntp.h" 44 #include "opt_xen.h" 45 46 47 #include <sys/param.h> 48 #include <sys/proc.h> 49 #include <sys/systm.h> 50 #include <sys/device.h> 51 #include <sys/timetc.h> 52 53 #include <uvm/uvm_extern.h> 54 55 #include <dev/ic/i8253reg.h> 56 57 #include <x86/machdep.h> 58 #include <machine/cpu.h> 59 #include <machine/cpu_counter.h> 60 #include <machine/cpufunc.h> 61 #include <machine/cpuvar.h> 62 #include <machine/pmap.h> 63 #include <machine/vmparam.h> 64 #include <machine/mpacpi.h> 65 #include <machine/mpbiosvar.h> 66 #include <machine/pcb.h> 67 #include <machine/pmap_private.h> 68 #include <machine/specialreg.h> 69 #include <machine/segments.h> 70 #include <x86/x86/tsc.h> 71 #include <x86/i82093var.h> 72 73 #include <machine/apicvar.h> 74 #include <machine/i82489reg.h> 75 #include <machine/i82489var.h> 76 77 #ifndef XENPV 78 #if NACPICA > 0 79 #include <dev/acpi/acpica.h> 80 #include <dev/acpi/acpivar.h> 81 #endif 82 83 #ifdef DDB 84 #include <machine/db_machdep.h> 85 #ifdef MULTIPROCESSOR 86 #ifdef __x86_64__ 87 typedef void (vector)(void); 88 extern vector Xintr_x2apic_ddbipi; 89 extern int ddb_vec; 90 #endif 91 #endif 92 #endif 93 94 #include <dev/vmt/vmtreg.h> /* for vmt_hvcall() */ 95 #include <dev/vmt/vmtvar.h> /* for vmt_hvcall() */ 96 97 /* Referenced from vector.S */ 98 void lapic_clockintr(void *, struct intrframe *); 99 100 static void lapic_delay(unsigned int); 101 static uint32_t lapic_gettick(void); 102 static void lapic_setup_bsp(paddr_t); 103 static void lapic_map(paddr_t); 104 105 static void lapic_hwmask(struct pic *, int); 106 static void lapic_hwunmask(struct pic *, int); 107 static void lapic_setup(struct pic *, struct cpu_info *, int, int, int); 108 /* Make it public to call via ddb */ 109 void lapic_dump(void); 110 111 struct pic local_pic = { 112 .pic_name = "lapic", 113 .pic_type = PIC_LAPIC, 114 .pic_lock = __SIMPLELOCK_UNLOCKED, 115 .pic_hwmask = lapic_hwmask, 116 .pic_hwunmask = lapic_hwunmask, 117 .pic_addroute = lapic_setup, 118 .pic_delroute = lapic_setup, 119 .pic_intr_get_devname = x86_intr_get_devname, 120 .pic_intr_get_assigned = x86_intr_get_assigned, 121 .pic_intr_get_count = x86_intr_get_count, 122 }; 123 124 static int i82489_ipi(int vec, int target, int dl); 125 static int x2apic_ipi(int vec, int target, int dl); 126 int (*x86_ipi)(int, int, int) = i82489_ipi; 127 128 bool x2apic_mode __read_mostly; 129 #ifdef LAPIC_ENABLE_X2APIC 130 bool x2apic_enable = true; 131 #else 132 bool x2apic_enable = false; 133 #endif 134 bool lapic_from_cpuid = false; 135 136 static bool lapic_broken_periodic __read_mostly; 137 138 static uint32_t 139 i82489_readreg(u_int reg) 140 { 141 return *((volatile uint32_t *)(local_apic_va + reg)); 142 } 143 144 static void 145 i82489_writereg(u_int reg, uint32_t val) 146 { 147 *((volatile uint32_t *)(local_apic_va + reg)) = val; 148 } 149 150 static uint32_t 151 i82489_cpu_number(void) 152 { 153 return i82489_readreg(LAPIC_ID) >> LAPIC_ID_SHIFT; 154 } 155 156 static uint32_t 157 x2apic_readreg(u_int reg) 158 { 159 return rdmsr(MSR_X2APIC_BASE + (reg >> 4)); 160 } 161 162 static void 163 x2apic_writereg(u_int reg, uint32_t val) 164 { 165 x86_mfence(); 166 wrmsr(MSR_X2APIC_BASE + (reg >> 4), val); 167 } 168 169 static void 170 x2apic_writereg64(u_int reg, uint64_t val) 171 { 172 KDASSERT(reg == LAPIC_ICRLO); 173 x86_mfence(); 174 wrmsr(MSR_X2APIC_BASE + (reg >> 4), val); 175 } 176 177 static void 178 x2apic_write_icr(uint32_t hi, uint32_t lo) 179 { 180 x2apic_writereg64(LAPIC_ICRLO, ((uint64_t)hi << 32) | lo); 181 } 182 183 static uint32_t 184 x2apic_cpu_number(void) 185 { 186 return x2apic_readreg(LAPIC_ID); 187 } 188 189 uint32_t 190 lapic_readreg(u_int reg) 191 { 192 if (x2apic_mode) 193 return x2apic_readreg(reg); 194 return i82489_readreg(reg); 195 } 196 197 void 198 lapic_writereg(u_int reg, uint32_t val) 199 { 200 if (x2apic_mode) 201 x2apic_writereg(reg, val); 202 else 203 i82489_writereg(reg, val); 204 } 205 206 void 207 lapic_write_tpri(uint32_t val) 208 { 209 210 val &= LAPIC_TPRI_MASK; 211 #ifdef i386 212 lapic_writereg(LAPIC_TPRI, val); 213 #else 214 lcr8(val >> 4); 215 #endif 216 } 217 218 uint32_t 219 lapic_cpu_number(void) 220 { 221 if (x2apic_mode) 222 return x2apic_cpu_number(); 223 return i82489_cpu_number(); 224 } 225 226 static void 227 lapic_enable_x2apic(void) 228 { 229 uint64_t apicbase; 230 231 apicbase = rdmsr(MSR_APICBASE); 232 if (!ISSET(apicbase, APICBASE_EN)) { 233 apicbase |= APICBASE_EN; 234 wrmsr(MSR_APICBASE, apicbase); 235 } 236 apicbase |= APICBASE_EXTD; 237 wrmsr(MSR_APICBASE, apicbase); 238 } 239 240 bool 241 lapic_is_x2apic(void) 242 { 243 uint64_t msr; 244 245 if (!ISSET(cpu_feature[0], CPUID_APIC) || 246 rdmsr_safe(MSR_APICBASE, &msr) == EFAULT) 247 return false; 248 return (msr & (APICBASE_EN | APICBASE_EXTD)) == 249 (APICBASE_EN | APICBASE_EXTD); 250 } 251 252 /* 253 * Initialize the local APIC on the BSP. 254 */ 255 static void 256 lapic_setup_bsp(paddr_t lapic_base) 257 { 258 u_int regs[6]; 259 const char *reason = NULL; 260 const char *hw_vendor; 261 bool bios_x2apic; 262 263 if (ISSET(cpu_feature[1], CPUID2_X2APIC)) { 264 #if NACPICA > 0 265 if (acpi_present) { 266 ACPI_TABLE_DMAR *dmar; 267 ACPI_STATUS status; 268 269 /* 270 * Automatically detect several configurations where 271 * x2APIC mode is known to cause troubles. User can 272 * override the setting with hw.x2apic_enable tunable. 273 */ 274 status = AcpiGetTable(ACPI_SIG_DMAR, 1, 275 (ACPI_TABLE_HEADER **)&dmar); 276 if (ACPI_SUCCESS(status)) { 277 if (ISSET(dmar->Flags, ACPI_DMAR_X2APIC_OPT_OUT)) { 278 reason = "by DMAR table"; 279 } 280 AcpiPutTable(&dmar->Header); 281 } 282 } 283 #endif /* NACPICA > 0 */ 284 if (vm_guest == VM_GUEST_VMWARE) { 285 vmt_hvcall(VM_CMD_GET_VCPU_INFO, regs); 286 if (ISSET(regs[0], VCPUINFO_VCPU_RESERVED) || 287 !ISSET(regs[0], VCPUINFO_LEGACY_X2APIC)) 288 reason = "inside VMWare without intr " 289 "redirection"; 290 } else if (vm_guest == VM_GUEST_XENHVM) { 291 reason = "due to running under XEN"; 292 } else if (vm_guest == VM_GUEST_NO && 293 CPUID_TO_FAMILY(curcpu()->ci_signature) == 6 && 294 CPUID_TO_MODEL(curcpu()->ci_signature) == 0x2a) { 295 hw_vendor = pmf_get_platform("board-vendor"); 296 if (hw_vendor != NULL) { 297 /* 298 * It seems that some Lenovo and ASUS 299 * SandyBridge-based notebook BIOSes have a bug 300 * which prevents booting AP in x2APIC mode. 301 * Since the only way to detect mobile CPU is 302 * to check northbridge pci id, which cannot be 303 * done that early, disable x2APIC for all 304 * Lenovo and ASUS SandyBridge machines. 305 */ 306 if (strcmp(hw_vendor, "LENOVO") == 0 || 307 strcmp(hw_vendor, "ASUSTeK Computer Inc.") == 0) { 308 reason = "for a suspected SandyBridge " 309 "BIOS bug"; 310 } 311 } 312 } 313 bios_x2apic = lapic_is_x2apic(); 314 if (reason != NULL && bios_x2apic) { 315 aprint_verbose("x2APIC should be disabled %s but " 316 "already enabled by BIOS; enabling.\n", reason); 317 reason = NULL; 318 } 319 if (reason == NULL) 320 x2apic_mode = true; 321 else 322 aprint_verbose("x2APIC available but disabled %s\n", 323 reason); 324 if (x2apic_enable != x2apic_mode) { 325 if (bios_x2apic && !x2apic_enable) 326 aprint_verbose("x2APIC disabled by user and " 327 "enabled by BIOS; ignoring user setting.\n"); 328 else 329 x2apic_mode = x2apic_enable; 330 } 331 } 332 if (x2apic_mode) { 333 x86_ipi = x2apic_ipi; 334 #if NIOAPIC > 0 335 struct ioapic_softc *ioapic; 336 for (ioapic = ioapics; ioapic != NULL; ioapic = ioapic->sc_next) { 337 ioapic->sc_pic.pic_edge_stubs = x2apic_edge_stubs; 338 ioapic->sc_pic.pic_level_stubs = x2apic_level_stubs; 339 } 340 #endif 341 #if defined(DDB) && defined(MULTIPROCESSOR) 342 #ifdef __x86_64__ 343 struct idt_vec *iv = &(cpu_info_primary.ci_idtvec); 344 idt_descriptor_t *idt = iv->iv_idt; 345 set_idtgate(&idt[ddb_vec], &Xintr_x2apic_ddbipi, 1, 346 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 347 #else 348 /* 349 * Set DDB IPI handler in cpu_set_tss_gates() when cpu0 is 350 * attached. 351 */ 352 #endif 353 #endif 354 355 x86_disable_intr(); 356 lapic_enable_x2apic(); 357 #ifdef MULTIPROCESSOR 358 cpu_init_first(); /* Catch up to changed cpu_number() */ 359 #endif 360 lapic_write_tpri(0); 361 x86_enable_intr(); 362 } else 363 lapic_map(lapic_base); 364 } 365 366 static void 367 lapic_map(paddr_t lapic_base) 368 { 369 pt_entry_t *pte; 370 vaddr_t va = local_apic_va; 371 372 /* 373 * If the CPU has an APIC MSR, use it and ignore the supplied value: 374 * some ACPI implementations have been observed to pass bad values. 375 * Additionally, ensure that the lapic is enabled as we are committed 376 * to using it at this point. Be conservative and assume that the MSR 377 * is not present on the Pentium (is it?). 378 */ 379 if (CPUID_TO_FAMILY(curcpu()->ci_signature) >= 6) { 380 lapic_base = (paddr_t)rdmsr(MSR_APICBASE); 381 if ((lapic_base & APICBASE_PHYSADDR) == 0) { 382 lapic_base |= LAPIC_BASE; 383 } 384 wrmsr(MSR_APICBASE, lapic_base | APICBASE_EN); 385 lapic_base &= APICBASE_PHYSADDR; 386 } 387 388 x86_disable_intr(); 389 390 /* 391 * Map local apic. If we have a local apic, it's safe to assume 392 * we're on a 486 or better and can use invlpg and non-cacheable PTE's 393 * 394 * Whap the PTE "by hand" rather than calling pmap_kenter_pa because 395 * the latter will attempt to invoke TLB shootdown code just as we 396 * might have changed the value of cpu_number().. 397 */ 398 399 pte = kvtopte(va); 400 *pte = lapic_base | PTE_W | PTE_P | PTE_PCD | pmap_pg_g | pmap_pg_nx; 401 invlpg(va); 402 403 #ifdef MULTIPROCESSOR 404 cpu_init_first(); /* Catch up to changed cpu_number() */ 405 #endif 406 407 lapic_write_tpri(0); 408 x86_enable_intr(); 409 } 410 411 /* 412 * enable local apic 413 */ 414 void 415 lapic_enable(void) 416 { 417 lapic_writereg(LAPIC_SVR, LAPIC_SVR_ENABLE | LAPIC_SPURIOUS_VECTOR); 418 } 419 420 void 421 lapic_set_lvt(void) 422 { 423 struct cpu_info *ci = curcpu(); 424 int i; 425 struct mp_intr_map *mpi; 426 uint32_t lint0, lint1; 427 428 #ifdef MULTIPROCESSOR 429 if (mp_verbose) { 430 apic_format_redir(device_xname(ci->ci_dev), "prelint", 0, 431 APIC_VECTYPE_LAPIC_LVT, 0, lapic_readreg(LAPIC_LVT_LINT0)); 432 apic_format_redir(device_xname(ci->ci_dev), "prelint", 1, 433 APIC_VECTYPE_LAPIC_LVT, 0, lapic_readreg(LAPIC_LVT_LINT1)); 434 } 435 #endif 436 437 /* 438 * If an I/O APIC has been attached, assume that it is used instead of 439 * the 8259A for interrupt delivery. Otherwise request the LAPIC to 440 * get external interrupts via LINT0 for the primary CPU. 441 */ 442 lint0 = LAPIC_DLMODE_EXTINT; 443 if (nioapics > 0 || !CPU_IS_PRIMARY(curcpu())) 444 lint0 |= LAPIC_LVT_MASKED; 445 lapic_writereg(LAPIC_LVT_LINT0, lint0); 446 447 /* 448 * Non Maskable Interrupts are to be delivered to the primary CPU. 449 */ 450 lint1 = LAPIC_DLMODE_NMI; 451 if (!CPU_IS_PRIMARY(curcpu())) 452 lint1 |= LAPIC_LVT_MASKED; 453 lapic_writereg(LAPIC_LVT_LINT1, lint1); 454 455 for (i = 0; i < mp_nintr; i++) { 456 mpi = &mp_intrs[i]; 457 if (mpi->ioapic == NULL && (mpi->cpu_id == MPS_ALL_APICS || 458 mpi->cpu_id == ci->ci_cpuid)) { 459 if (mpi->ioapic_pin > 1) 460 aprint_error_dev(ci->ci_dev, 461 "%s: WARNING: bad pin value %d\n", 462 __func__, mpi->ioapic_pin); 463 if (mpi->ioapic_pin == 0) 464 lapic_writereg(LAPIC_LVT_LINT0, mpi->redir); 465 else 466 lapic_writereg(LAPIC_LVT_LINT1, mpi->redir); 467 } 468 } 469 470 #ifdef MULTIPROCESSOR 471 if (mp_verbose) 472 lapic_dump(); 473 #endif 474 } 475 476 /* 477 * Initialize fixed idt vectors for use by local apic. 478 */ 479 void 480 lapic_boot_init(paddr_t lapic_base) 481 { 482 struct idt_vec *iv = &(cpu_info_primary.ci_idtvec); 483 484 lapic_setup_bsp(lapic_base); 485 486 #ifdef MULTIPROCESSOR 487 idt_vec_reserve(iv, LAPIC_IPI_VECTOR); 488 idt_vec_set(iv, LAPIC_IPI_VECTOR, 489 x2apic_mode ? Xintr_x2apic_ipi : Xintr_lapic_ipi); 490 491 idt_vec_reserve(iv, LAPIC_TLB_VECTOR); 492 idt_vec_set(iv, LAPIC_TLB_VECTOR, 493 x2apic_mode ? Xintr_x2apic_tlb : Xintr_lapic_tlb); 494 #endif 495 idt_vec_reserve(iv, LAPIC_SPURIOUS_VECTOR); 496 idt_vec_set(iv, LAPIC_SPURIOUS_VECTOR, Xintrspurious); 497 498 idt_vec_reserve(iv, LAPIC_TIMER_VECTOR); 499 idt_vec_set(iv, LAPIC_TIMER_VECTOR, 500 x2apic_mode ? Xintr_x2apic_ltimer : Xintr_lapic_ltimer); 501 } 502 503 static uint32_t 504 lapic_gettick(void) 505 { 506 return lapic_readreg(LAPIC_CCR_TIMER); 507 } 508 509 #include <sys/kernel.h> /* for hz */ 510 511 uint32_t lapic_tval; 512 513 /* 514 * this gets us up to a 4GHz busclock.... 515 */ 516 uint32_t lapic_per_second; 517 uint32_t lapic_frac_usec_per_cycle; 518 uint64_t lapic_frac_cycle_per_usec; 519 uint32_t lapic_delaytab[26]; 520 521 static u_int 522 lapic_get_timecount(struct timecounter *tc) 523 { 524 struct cpu_info *ci; 525 uint32_t cur_timer; 526 int s; 527 528 s = splhigh(); 529 ci = curcpu(); 530 531 /* 532 * Check for a race against the clockinterrupt. 533 * The update of ci_lapic_counter is blocked by splhigh() and 534 * the check for a pending clockinterrupt compensates for that. 535 * 536 * If the current tick is almost the Initial Counter, explicitly 537 * check for the pending interrupt bit as the interrupt delivery 538 * could be asynchronous and compensate as well. 539 * 540 * This can't be done without splhigh() as the calling code might 541 * have masked the clockinterrupt already. 542 * 543 * This code assumes that clockinterrupts are not missed. 544 */ 545 cur_timer = lapic_gettick(); 546 if (cur_timer >= lapic_tval - 1) { 547 uint16_t reg = LAPIC_IRR + LAPIC_TIMER_VECTOR / 32 * 16; 548 549 if (lapic_readreg(reg) & (1 << (LAPIC_TIMER_VECTOR % 32))) { 550 cur_timer -= lapic_tval; 551 } 552 } else if (ci->ci_ipending & (1ULL << LIR_TIMER)) 553 cur_timer = lapic_gettick() - lapic_tval; 554 cur_timer = ci->ci_lapic_counter - cur_timer; 555 splx(s); 556 557 return cur_timer; 558 } 559 560 static struct timecounter lapic_timecounter = { 561 .tc_get_timecount = lapic_get_timecount, 562 .tc_counter_mask = ~0u, 563 .tc_name = "lapic", 564 .tc_quality = 565 #ifndef MULTIPROCESSOR 566 2100, 567 #else 568 -100, /* per CPU state */ 569 #endif 570 }; 571 572 extern u_int i8254_get_timecount(struct timecounter *); 573 574 void 575 lapic_clockintr(void *arg, struct intrframe *frame) 576 { 577 struct cpu_info *ci = curcpu(); 578 579 ci->ci_lapic_counter += lapic_tval; 580 ci->ci_isources[LIR_TIMER]->is_evcnt.ev_count++; 581 hardclock((struct clockframe *)frame); 582 } 583 584 void 585 lapic_reset(void) 586 { 587 588 /* 589 * Mask the clock interrupt and set mode, 590 * then set divisor, 591 * then unmask and set the vector. 592 */ 593 lapic_writereg(LAPIC_LVT_TIMER, 594 LAPIC_LVT_TMM_PERIODIC | LAPIC_LVT_MASKED); 595 lapic_writereg(LAPIC_DCR_TIMER, LAPIC_DCRT_DIV1); 596 lapic_writereg(LAPIC_ICR_TIMER, lapic_tval); 597 lapic_writereg(LAPIC_LVT_TIMER, 598 LAPIC_LVT_TMM_PERIODIC | LAPIC_TIMER_VECTOR); 599 lapic_writereg(LAPIC_EOI, 0); 600 } 601 602 static void 603 lapic_initclock(void) 604 { 605 606 if (curcpu() == &cpu_info_primary) { 607 /* 608 * Recalibrate the timer using the cycle counter, now that 609 * the cycle counter itself has been recalibrated. 610 * 611 * Not needed when lapic_per_second is read from CPUID. 612 */ 613 if (!lapic_from_cpuid) 614 lapic_calibrate_timer(true); 615 /* 616 * Hook up time counter. This assume that all LAPICs have 617 * the same frequency. 618 */ 619 lapic_timecounter.tc_frequency = lapic_per_second; 620 tc_init(&lapic_timecounter); 621 } 622 623 /* Start local apic countdown timer running, in repeated mode. */ 624 lapic_reset(); 625 } 626 627 /* 628 * Calibrate the local apic count-down timer (which is running at 629 * bus-clock speed) vs. the i8254 counter/timer (which is running at 630 * a fixed rate). 631 * 632 * The Intel MP spec says: "An MP operating system may use the IRQ8 633 * real-time clock as a reference to determine the actual APIC timer clock 634 * speed." 635 * 636 * We're actually using the IRQ0 timer. Hmm. 637 */ 638 void 639 lapic_calibrate_timer(bool secondpass) 640 { 641 struct cpu_info *ci = curcpu(); 642 uint64_t tmp; 643 int i; 644 char tbuf[9]; 645 646 KASSERT(ci == &cpu_info_primary); 647 648 aprint_debug_dev(ci->ci_dev, "[re]calibrating local timer\n"); 649 650 /* 651 * Configure timer to one-shot, interrupt masked, 652 * large positive number. 653 */ 654 x86_disable_intr(); 655 lapic_writereg(LAPIC_LVT_TIMER, LAPIC_LVT_MASKED); 656 lapic_writereg(LAPIC_DCR_TIMER, LAPIC_DCRT_DIV1); 657 lapic_writereg(LAPIC_ICR_TIMER, 0x80000000); 658 (void)lapic_gettick(); 659 660 if (secondpass && cpu_hascounter()) { 661 /* 662 * Second pass calibration, using the TSC which has ideally 663 * been calibrated using the HPET or information gleaned 664 * from MSRs by this point. 665 */ 666 uint64_t l0, l1, t0, t1; 667 668 (void)cpu_counter(); 669 t0 = cpu_counter(); 670 l0 = lapic_gettick(); 671 t0 += cpu_counter(); 672 DELAY(50000); 673 t1 = cpu_counter(); 674 l1 = lapic_gettick(); 675 t1 += cpu_counter(); 676 677 tmp = (l0 - l1) * cpu_frequency(ci) / ((t1 - t0 + 1) / 2); 678 lapic_per_second = rounddown(tmp + 500, 1000); 679 } else if (lapic_per_second == 0) { 680 /* 681 * Inaccurate first pass calibration using the i8254. 682 */ 683 unsigned int seen, delta, initial_i8254, initial_lapic; 684 unsigned int cur_i8254, cur_lapic; 685 686 (void)gettick(); 687 initial_lapic = lapic_gettick(); 688 initial_i8254 = gettick(); 689 for (seen = 0; seen < TIMER_FREQ / 100; seen += delta) { 690 cur_i8254 = gettick(); 691 if (cur_i8254 > initial_i8254) 692 delta = x86_rtclock_tval - (cur_i8254 - initial_i8254); 693 else 694 delta = initial_i8254 - cur_i8254; 695 initial_i8254 = cur_i8254; 696 } 697 cur_lapic = lapic_gettick(); 698 tmp = initial_lapic - cur_lapic; 699 lapic_per_second = (tmp * TIMER_FREQ + seen / 2) / seen; 700 } 701 x86_enable_intr(); 702 703 humanize_number(tbuf, sizeof(tbuf), lapic_per_second, "Hz", 1000); 704 aprint_debug_dev(ci->ci_dev, "apic clock running at %s\n", tbuf); 705 706 if (lapic_per_second != 0) { 707 /* 708 * reprogram the apic timer to run in periodic mode. 709 * XXX need to program timer on other CPUs, too. 710 */ 711 lapic_tval = (lapic_per_second * 2) / hz; 712 lapic_tval = (lapic_tval / 2) + (lapic_tval & 0x1); 713 714 lapic_writereg(LAPIC_LVT_TIMER, LAPIC_LVT_TMM_PERIODIC 715 | LAPIC_LVT_MASKED | LAPIC_TIMER_VECTOR); 716 lapic_writereg(LAPIC_DCR_TIMER, LAPIC_DCRT_DIV1); 717 lapic_writereg(LAPIC_ICR_TIMER, lapic_tval); 718 719 /* 720 * Compute fixed-point ratios between cycles and 721 * microseconds to avoid having to do any division 722 * in lapic_delay. 723 */ 724 725 tmp = (1000000 * (uint64_t)1 << 32) / lapic_per_second; 726 lapic_frac_usec_per_cycle = tmp; 727 728 tmp = (lapic_per_second * (uint64_t)1 << 32) / 1000000; 729 730 lapic_frac_cycle_per_usec = tmp; 731 732 /* 733 * Compute delay in cycles for likely short delays in usec. 734 */ 735 for (i = 0; i < 26; i++) 736 lapic_delaytab[i] = (lapic_frac_cycle_per_usec * i) >> 737 32; 738 739 /* 740 * Apply workaround for broken periodic timer under KVM 741 */ 742 if (vm_guest == VM_GUEST_KVM) { 743 lapic_broken_periodic = true; 744 lapic_timecounter.tc_quality = -100; 745 aprint_debug_dev(ci->ci_dev, 746 "applying KVM timer workaround\n"); 747 } 748 749 /* 750 * Now that the timer's calibrated, use the apic timer routines 751 * for all our timing needs.. 752 */ 753 if (!secondpass) { 754 delay_func = lapic_delay; 755 x86_initclock_func = lapic_initclock; 756 initrtclock(0); 757 } 758 } 759 } 760 761 /* 762 * delay for N usec. 763 */ 764 765 static void 766 lapic_delay(unsigned int usec) 767 { 768 int32_t xtick, otick; 769 int64_t deltat; 770 771 /* XXX Bad to disable preemption, but it's tied to the cpu. */ 772 kpreempt_disable(); 773 otick = lapic_gettick(); 774 775 if (usec <= 0) { 776 kpreempt_enable(); 777 return; 778 } 779 780 if (usec <= 25) 781 deltat = lapic_delaytab[usec]; 782 else 783 deltat = (lapic_frac_cycle_per_usec * usec) >> 32; 784 785 while (deltat > 0) { 786 xtick = lapic_gettick(); 787 if (lapic_broken_periodic && xtick == 0 && otick == 0) { 788 lapic_reset(); 789 xtick = lapic_gettick(); 790 if (xtick == 0) 791 panic("lapic timer stopped ticking"); 792 } 793 if (xtick > otick) 794 deltat -= lapic_tval - (xtick - otick); 795 else 796 deltat -= otick - xtick; 797 otick = xtick; 798 799 x86_pause(); 800 } 801 kpreempt_enable(); 802 } 803 804 /* 805 * XXX the following belong mostly or partly elsewhere.. 806 */ 807 808 static void 809 i82489_icr_wait(void) 810 { 811 #ifdef DIAGNOSTIC 812 unsigned j = 100000; 813 #endif /* DIAGNOSTIC */ 814 815 while ((i82489_readreg(LAPIC_ICRLO) & LAPIC_DLSTAT_BUSY) != 0) { 816 x86_pause(); 817 #ifdef DIAGNOSTIC 818 j--; 819 if (j == 0) 820 panic("i82489_icr_wait: busy"); 821 #endif /* DIAGNOSTIC */ 822 } 823 } 824 825 static int 826 i82489_ipi_init(int target) 827 { 828 uint32_t esr; 829 830 i82489_writereg(LAPIC_ESR, 0); 831 (void)i82489_readreg(LAPIC_ESR); 832 833 i82489_writereg(LAPIC_ICRHI, target << LAPIC_ID_SHIFT); 834 835 i82489_writereg(LAPIC_ICRLO, LAPIC_DLMODE_INIT | LAPIC_LEVEL_ASSERT); 836 i82489_icr_wait(); 837 delay_func(10000); 838 i82489_writereg(LAPIC_ICRLO, 839 LAPIC_DLMODE_INIT | LAPIC_TRIGMODE_LEVEL | LAPIC_LEVEL_DEASSERT); 840 i82489_icr_wait(); 841 842 if ((i82489_readreg(LAPIC_ICRLO) & LAPIC_DLSTAT_BUSY) != 0) 843 return EBUSY; 844 845 esr = i82489_readreg(LAPIC_ESR); 846 if (esr != 0) 847 aprint_debug("%s: ESR %08x\n", __func__, esr); 848 849 return 0; 850 } 851 852 static int 853 i82489_ipi_startup(int target, int vec) 854 { 855 uint32_t esr; 856 857 i82489_writereg(LAPIC_ESR, 0); 858 (void)i82489_readreg(LAPIC_ESR); 859 860 i82489_icr_wait(); 861 i82489_writereg(LAPIC_ICRHI, target << LAPIC_ID_SHIFT); 862 i82489_writereg(LAPIC_ICRLO, vec | LAPIC_DLMODE_STARTUP | 863 LAPIC_LEVEL_ASSERT); 864 i82489_icr_wait(); 865 866 if ((i82489_readreg(LAPIC_ICRLO) & LAPIC_DLSTAT_BUSY) != 0) 867 return EBUSY; 868 869 esr = i82489_readreg(LAPIC_ESR); 870 if (esr != 0) 871 aprint_debug("%s: ESR %08x\n", __func__, esr); 872 873 return 0; 874 } 875 876 static int 877 i82489_ipi(int vec, int target, int dl) 878 { 879 int result, s; 880 881 s = splhigh(); 882 883 i82489_icr_wait(); 884 885 if ((target & LAPIC_DEST_MASK) == 0) 886 i82489_writereg(LAPIC_ICRHI, target << LAPIC_ID_SHIFT); 887 888 i82489_writereg(LAPIC_ICRLO, 889 (target & LAPIC_DEST_MASK) | vec | dl | LAPIC_LEVEL_ASSERT); 890 891 #ifdef DIAGNOSTIC 892 i82489_icr_wait(); 893 result = (i82489_readreg(LAPIC_ICRLO) & LAPIC_DLSTAT_BUSY) ? EBUSY : 0; 894 #else 895 /* Don't wait - if it doesn't go, we're in big trouble anyway. */ 896 result = 0; 897 #endif 898 splx(s); 899 900 return result; 901 } 902 903 static int 904 x2apic_ipi_init(int target) 905 { 906 907 x2apic_write_icr(target, LAPIC_DLMODE_INIT | LAPIC_LEVEL_ASSERT); 908 909 delay_func(10000); 910 911 x2apic_write_icr(0, 912 LAPIC_DLMODE_INIT | LAPIC_TRIGMODE_LEVEL | LAPIC_LEVEL_DEASSERT); 913 914 return 0; 915 } 916 917 static int 918 x2apic_ipi_startup(int target, int vec) 919 { 920 921 x2apic_write_icr(target, 922 vec | LAPIC_DLMODE_STARTUP | LAPIC_LEVEL_ASSERT); 923 924 return 0; 925 } 926 927 static int 928 x2apic_ipi(int vec, int target, int dl) 929 { 930 uint32_t dest_id = 0; 931 932 if ((target & LAPIC_DEST_MASK) == 0) 933 dest_id = target; 934 935 x2apic_write_icr(dest_id, 936 (target & LAPIC_DEST_MASK) | vec | dl | LAPIC_LEVEL_ASSERT); 937 938 return 0; 939 } 940 941 int 942 x86_ipi_init(int target) 943 { 944 if (x2apic_mode) 945 return x2apic_ipi_init(target); 946 return i82489_ipi_init(target); 947 } 948 949 int 950 x86_ipi_startup(int target, int vec) 951 { 952 if (x2apic_mode) 953 return x2apic_ipi_startup(target, vec); 954 return i82489_ipi_startup(target, vec); 955 } 956 957 /* 958 * Using 'pin numbers' as: 959 * 0 - timer 960 * 1 - thermal 961 * 2 - PCINT 962 * 3 - LVINT0 963 * 4 - LVINT1 964 * 5 - LVERR 965 */ 966 967 static void 968 lapic_hwmask(struct pic *pic, int pin) 969 { 970 int reg; 971 uint32_t val; 972 973 reg = LAPIC_LVT_TIMER + (pin << 4); 974 val = lapic_readreg(reg); 975 val |= LAPIC_LVT_MASKED; 976 lapic_writereg(reg, val); 977 } 978 979 static void 980 lapic_hwunmask(struct pic *pic, int pin) 981 { 982 int reg; 983 uint32_t val; 984 985 reg = LAPIC_LVT_TIMER + (pin << 4); 986 val = lapic_readreg(reg); 987 val &= ~LAPIC_LVT_MASKED; 988 lapic_writereg(reg, val); 989 } 990 991 static void 992 lapic_setup(struct pic *pic, struct cpu_info *ci, 993 int pin, int idtvec, int type) 994 { 995 } 996 997 void 998 lapic_dump(void) 999 { 1000 struct cpu_info *ci = curcpu(); 1001 1002 #define APIC_LVT_PRINT(ci, where, idx, lvtreg) \ 1003 apic_format_redir(device_xname(ci->ci_dev), where, (idx), \ 1004 APIC_VECTYPE_LAPIC_LVT, 0, lapic_readreg(lvtreg)) 1005 1006 APIC_LVT_PRINT(ci, "cmci", 0, LAPIC_LVT_CMCI); 1007 APIC_LVT_PRINT(ci, "timer", 0, LAPIC_LVT_TIMER); 1008 APIC_LVT_PRINT(ci, "thermal", 0, LAPIC_LVT_THERM); 1009 APIC_LVT_PRINT(ci, "pcint", 0, LAPIC_LVT_PCINT); 1010 APIC_LVT_PRINT(ci, "lint", 0, LAPIC_LVT_LINT0); 1011 APIC_LVT_PRINT(ci, "lint", 1, LAPIC_LVT_LINT1); 1012 APIC_LVT_PRINT(ci, "err", 0, LAPIC_LVT_ERR); 1013 1014 #undef APIC_LVT_PRINT 1015 } 1016 #else /* XENPV */ 1017 void 1018 lapic_boot_init(paddr_t lapic_base) 1019 { 1020 } 1021 #endif /* XENPV */ 1022
Indexes created Sat Sep 20 22:09:52 GMT 2025