cpu.c revision 1.107
1 /* $NetBSD: cpu.c,v 1.107 2013/12/01 01:05:16 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2000-2012 NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Bill Sommerfeld of RedBack Networks Inc, and by Andrew Doran. 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1999 Stefan Grefen 34 * 35 * Redistribution and use in source and binary forms, with or without 36 * modification, are permitted provided that the following conditions 37 * are met: 38 * 1. Redistributions of source code must retain the above copyright 39 * notice, this list of conditions and the following disclaimer. 40 * 2. Redistributions in binary form must reproduce the above copyright 41 * notice, this list of conditions and the following disclaimer in the 42 * documentation and/or other materials provided with the distribution. 43 * 3. All advertising materials mentioning features or use of this software 44 * must display the following acknowledgement: 45 * This product includes software developed by the NetBSD 46 * Foundation, Inc. and its contributors. 47 * 4. Neither the name of The NetBSD Foundation nor the names of its 48 * contributors may be used to endorse or promote products derived 49 * from this software without specific prior written permission. 50 * 51 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY 52 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 53 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 54 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR AND CONTRIBUTORS BE LIABLE 55 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 56 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 57 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 59 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 60 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 61 * SUCH DAMAGE. 62 */ 63 64 #include <sys/cdefs.h> 65 __KERNEL_RCSID(0, "$NetBSD: cpu.c,v 1.107 2013/12/01 01:05:16 christos Exp $"); 66 67 #include "opt_ddb.h" 68 #include "opt_mpbios.h" /* for MPDEBUG */ 69 #include "opt_mtrr.h" 70 #include "opt_multiprocessor.h" 71 72 #include "lapic.h" 73 #include "ioapic.h" 74 75 #ifdef i386 76 #include "npx.h" 77 #endif 78 79 #include <sys/param.h> 80 #include <sys/proc.h> 81 #include <sys/systm.h> 82 #include <sys/device.h> 83 #include <sys/kmem.h> 84 #include <sys/cpu.h> 85 #include <sys/cpufreq.h> 86 #include <sys/idle.h> 87 #include <sys/atomic.h> 88 #include <sys/reboot.h> 89 90 #include <uvm/uvm.h> 91 92 #include "acpica.h" /* for NACPICA, for mp_verbose */ 93 94 #include <machine/cpufunc.h> 95 #include <machine/cpuvar.h> 96 #include <machine/pmap.h> 97 #include <machine/vmparam.h> 98 #if defined(MULTIPROCESSOR) 99 #include <machine/mpbiosvar.h> 100 #endif 101 #include <machine/mpconfig.h> /* for mp_verbose */ 102 #include <machine/pcb.h> 103 #include <machine/specialreg.h> 104 #include <machine/segments.h> 105 #include <machine/gdt.h> 106 #include <machine/mtrr.h> 107 #include <machine/pio.h> 108 #include <machine/cpu_counter.h> 109 110 #ifdef i386 111 #include <machine/tlog.h> 112 #endif 113 114 #if NLAPIC > 0 115 #include <machine/apicvar.h> 116 #include <machine/i82489reg.h> 117 #include <machine/i82489var.h> 118 #endif 119 120 #include <dev/ic/mc146818reg.h> 121 #include <i386/isa/nvram.h> 122 #include <dev/isa/isareg.h> 123 124 #include "tsc.h" 125 126 static int cpu_match(device_t, cfdata_t, void *); 127 static void cpu_attach(device_t, device_t, void *); 128 static void cpu_defer(device_t); 129 static int cpu_rescan(device_t, const char *, const int *); 130 static void cpu_childdetached(device_t, device_t); 131 static bool cpu_stop(device_t); 132 static bool cpu_suspend(device_t, const pmf_qual_t *); 133 static bool cpu_resume(device_t, const pmf_qual_t *); 134 static bool cpu_shutdown(device_t, int); 135 136 struct cpu_softc { 137 device_t sc_dev; /* device tree glue */ 138 struct cpu_info *sc_info; /* pointer to CPU info */ 139 bool sc_wasonline; 140 }; 141 142 #ifdef MULTIPROCESSOR 143 int mp_cpu_start(struct cpu_info *, paddr_t); 144 void mp_cpu_start_cleanup(struct cpu_info *); 145 const struct cpu_functions mp_cpu_funcs = { mp_cpu_start, NULL, 146 mp_cpu_start_cleanup }; 147 #endif 148 149 150 CFATTACH_DECL2_NEW(cpu, sizeof(struct cpu_softc), 151 cpu_match, cpu_attach, NULL, NULL, cpu_rescan, cpu_childdetached); 152 153 /* 154 * Statically-allocated CPU info for the primary CPU (or the only 155 * CPU, on uniprocessors). The CPU info list is initialized to 156 * point at it. 157 */ 158 #ifdef TRAPLOG 159 struct tlog tlog_primary; 160 #endif 161 struct cpu_info cpu_info_primary __aligned(CACHE_LINE_SIZE) = { 162 .ci_dev = 0, 163 .ci_self = &cpu_info_primary, 164 .ci_idepth = -1, 165 .ci_curlwp = &lwp0, 166 .ci_curldt = -1, 167 #ifdef TRAPLOG 168 .ci_tlog_base = &tlog_primary, 169 #endif /* !TRAPLOG */ 170 }; 171 172 struct cpu_info *cpu_info_list = &cpu_info_primary; 173 174 static void cpu_set_tss_gates(struct cpu_info *); 175 176 #ifdef i386 177 static void tss_init(struct i386tss *, void *, void *); 178 #endif 179 180 static void cpu_init_idle_lwp(struct cpu_info *); 181 182 uint32_t cpu_feature[5]; /* X86 CPUID feature bits 183 * [0] basic features %edx 184 * [1] basic features %ecx 185 * [2] extended features %edx 186 * [3] extended features %ecx 187 * [4] VIA padlock features 188 */ 189 190 extern char x86_64_doubleflt_stack[]; 191 192 #ifdef MULTIPROCESSOR 193 bool x86_mp_online; 194 paddr_t mp_trampoline_paddr = MP_TRAMPOLINE; 195 #endif 196 #if NLAPIC > 0 197 static vaddr_t cmos_data_mapping; 198 #endif 199 struct cpu_info *cpu_starting; 200 201 #ifdef MULTIPROCESSOR 202 void cpu_hatch(void *); 203 static void cpu_boot_secondary(struct cpu_info *ci); 204 static void cpu_start_secondary(struct cpu_info *ci); 205 #endif 206 #if NLAPIC > 0 207 static void cpu_copy_trampoline(void); 208 #endif 209 210 /* 211 * Runs once per boot once multiprocessor goo has been detected and 212 * the local APIC on the boot processor has been mapped. 213 * 214 * Called from lapic_boot_init() (from mpbios_scan()). 215 */ 216 #if NLAPIC > 0 217 void 218 cpu_init_first(void) 219 { 220 221 cpu_info_primary.ci_cpuid = lapic_cpu_number(); 222 cpu_copy_trampoline(); 223 224 cmos_data_mapping = uvm_km_alloc(kernel_map, PAGE_SIZE, 0, UVM_KMF_VAONLY); 225 if (cmos_data_mapping == 0) 226 panic("No KVA for page 0"); 227 pmap_kenter_pa(cmos_data_mapping, 0, VM_PROT_READ|VM_PROT_WRITE, 0); 228 pmap_update(pmap_kernel()); 229 } 230 #endif 231 232 static int 233 cpu_match(device_t parent, cfdata_t match, void *aux) 234 { 235 236 return 1; 237 } 238 239 static void 240 cpu_vm_init(struct cpu_info *ci) 241 { 242 int ncolors = 2, i; 243 244 for (i = CAI_ICACHE; i <= CAI_L2CACHE; i++) { 245 struct x86_cache_info *cai; 246 int tcolors; 247 248 cai = &ci->ci_cinfo[i]; 249 250 tcolors = atop(cai->cai_totalsize); 251 switch(cai->cai_associativity) { 252 case 0xff: 253 tcolors = 1; /* fully associative */ 254 break; 255 case 0: 256 case 1: 257 break; 258 default: 259 tcolors /= cai->cai_associativity; 260 } 261 ncolors = max(ncolors, tcolors); 262 /* 263 * If the desired number of colors is not a power of 264 * two, it won't be good. Find the greatest power of 265 * two which is an even divisor of the number of colors, 266 * to preserve even coloring of pages. 267 */ 268 if (ncolors & (ncolors - 1) ) { 269 int try, picked = 1; 270 for (try = 1; try < ncolors; try *= 2) { 271 if (ncolors % try == 0) picked = try; 272 } 273 if (picked == 1) { 274 panic("desired number of cache colors %d is " 275 " > 1, but not even!", ncolors); 276 } 277 ncolors = picked; 278 } 279 } 280 281 /* 282 * Knowing the size of the largest cache on this CPU, potentially 283 * re-color our pages. 284 */ 285 aprint_debug_dev(ci->ci_dev, "%d page colors\n", ncolors); 286 uvm_page_recolor(ncolors); 287 288 pmap_tlb_cpu_init(ci); 289 } 290 291 static void 292 cpu_attach(device_t parent, device_t self, void *aux) 293 { 294 struct cpu_softc *sc = device_private(self); 295 struct cpu_attach_args *caa = aux; 296 struct cpu_info *ci; 297 uintptr_t ptr; 298 #if NLAPIC > 0 299 int cpunum = caa->cpu_number; 300 #endif 301 static bool again; 302 303 sc->sc_dev = self; 304 305 if (ncpu == maxcpus) { 306 #ifndef _LP64 307 aprint_error(": too many CPUs, please use NetBSD/amd64\n"); 308 #else 309 aprint_error(": too many CPUs\n"); 310 #endif 311 return; 312 } 313 314 /* 315 * If we're an Application Processor, allocate a cpu_info 316 * structure, otherwise use the primary's. 317 */ 318 if (caa->cpu_role == CPU_ROLE_AP) { 319 if ((boothowto & RB_MD1) != 0) { 320 aprint_error(": multiprocessor boot disabled\n"); 321 if (!pmf_device_register(self, NULL, NULL)) 322 aprint_error_dev(self, 323 "couldn't establish power handler\n"); 324 return; 325 } 326 aprint_naive(": Application Processor\n"); 327 ptr = (uintptr_t)kmem_zalloc(sizeof(*ci) + CACHE_LINE_SIZE - 1, 328 KM_SLEEP); 329 ci = (struct cpu_info *)roundup2(ptr, CACHE_LINE_SIZE); 330 ci->ci_curldt = -1; 331 #ifdef TRAPLOG 332 ci->ci_tlog_base = kmem_zalloc(sizeof(struct tlog), KM_SLEEP); 333 #endif 334 } else { 335 aprint_naive(": %s Processor\n", 336 caa->cpu_role == CPU_ROLE_SP ? "Single" : "Boot"); 337 ci = &cpu_info_primary; 338 #if NLAPIC > 0 339 if (cpunum != lapic_cpu_number()) { 340 /* XXX should be done earlier. */ 341 uint32_t reg; 342 aprint_verbose("\n"); 343 aprint_verbose_dev(self, "running CPU at apic %d" 344 " instead of at expected %d", lapic_cpu_number(), 345 cpunum); 346 reg = i82489_readreg(LAPIC_ID); 347 i82489_writereg(LAPIC_ID, (reg & ~LAPIC_ID_MASK) | 348 (cpunum << LAPIC_ID_SHIFT)); 349 } 350 if (cpunum != lapic_cpu_number()) { 351 aprint_error_dev(self, "unable to reset apic id\n"); 352 } 353 #endif 354 } 355 356 ci->ci_self = ci; 357 sc->sc_info = ci; 358 ci->ci_dev = self; 359 ci->ci_acpiid = caa->cpu_id; 360 ci->ci_cpuid = caa->cpu_number; 361 ci->ci_func = caa->cpu_func; 362 363 /* Must be before mi_cpu_attach(). */ 364 cpu_vm_init(ci); 365 366 if (caa->cpu_role == CPU_ROLE_AP) { 367 int error; 368 369 error = mi_cpu_attach(ci); 370 if (error != 0) { 371 aprint_normal("\n"); 372 aprint_error_dev(self, 373 "mi_cpu_attach failed with %d\n", error); 374 return; 375 } 376 cpu_init_tss(ci); 377 } else { 378 KASSERT(ci->ci_data.cpu_idlelwp != NULL); 379 } 380 381 pmap_reference(pmap_kernel()); 382 ci->ci_pmap = pmap_kernel(); 383 ci->ci_tlbstate = TLBSTATE_STALE; 384 385 /* 386 * Boot processor may not be attached first, but the below 387 * must be done to allow booting other processors. 388 */ 389 if (!again) { 390 atomic_or_32(&ci->ci_flags, CPUF_PRESENT | CPUF_PRIMARY); 391 /* Basic init. */ 392 cpu_intr_init(ci); 393 cpu_get_tsc_freq(ci); 394 cpu_init(ci); 395 cpu_set_tss_gates(ci); 396 pmap_cpu_init_late(ci); 397 #if NLAPIC > 0 398 if (caa->cpu_role != CPU_ROLE_SP) { 399 /* Enable lapic. */ 400 lapic_enable(); 401 lapic_set_lvt(); 402 lapic_calibrate_timer(ci); 403 } 404 #endif 405 /* Make sure DELAY() is initialized. */ 406 DELAY(1); 407 again = true; 408 } 409 410 /* further PCB init done later. */ 411 412 switch (caa->cpu_role) { 413 case CPU_ROLE_SP: 414 atomic_or_32(&ci->ci_flags, CPUF_SP); 415 cpu_identify(ci); 416 x86_errata(); 417 x86_cpu_idle_init(); 418 break; 419 420 case CPU_ROLE_BP: 421 atomic_or_32(&ci->ci_flags, CPUF_BSP); 422 cpu_identify(ci); 423 x86_errata(); 424 x86_cpu_idle_init(); 425 break; 426 427 #ifdef MULTIPROCESSOR 428 case CPU_ROLE_AP: 429 /* 430 * report on an AP 431 */ 432 cpu_intr_init(ci); 433 gdt_alloc_cpu(ci); 434 cpu_set_tss_gates(ci); 435 pmap_cpu_init_late(ci); 436 cpu_start_secondary(ci); 437 if (ci->ci_flags & CPUF_PRESENT) { 438 struct cpu_info *tmp; 439 440 cpu_identify(ci); 441 tmp = cpu_info_list; 442 while (tmp->ci_next) 443 tmp = tmp->ci_next; 444 445 tmp->ci_next = ci; 446 } 447 break; 448 #endif 449 450 default: 451 aprint_normal("\n"); 452 panic("unknown processor type??\n"); 453 } 454 455 pat_init(ci); 456 457 if (!pmf_device_register1(self, cpu_suspend, cpu_resume, cpu_shutdown)) 458 aprint_error_dev(self, "couldn't establish power handler\n"); 459 460 #ifdef MULTIPROCESSOR 461 if (mp_verbose) { 462 struct lwp *l = ci->ci_data.cpu_idlelwp; 463 struct pcb *pcb = lwp_getpcb(l); 464 465 aprint_verbose_dev(self, 466 "idle lwp at %p, idle sp at %p\n", 467 l, 468 #ifdef i386 469 (void *)pcb->pcb_esp 470 #else 471 (void *)pcb->pcb_rsp 472 #endif 473 ); 474 } 475 #endif 476 477 /* 478 * Postpone the "cpufeaturebus" scan. 479 * It is safe to scan the pseudo-bus 480 * only after all CPUs have attached. 481 */ 482 (void)config_defer(self, cpu_defer); 483 } 484 485 static void 486 cpu_defer(device_t self) 487 { 488 cpu_rescan(self, NULL, NULL); 489 } 490 491 static int 492 cpu_rescan(device_t self, const char *ifattr, const int *locators) 493 { 494 struct cpu_softc *sc = device_private(self); 495 struct cpufeature_attach_args cfaa; 496 struct cpu_info *ci = sc->sc_info; 497 498 memset(&cfaa, 0, sizeof(cfaa)); 499 cfaa.ci = ci; 500 501 if (ifattr_match(ifattr, "cpufeaturebus")) { 502 503 if (ci->ci_frequency == NULL) { 504 cfaa.name = "frequency"; 505 ci->ci_frequency = config_found_ia(self, 506 "cpufeaturebus", &cfaa, NULL); 507 } 508 509 if (ci->ci_padlock == NULL) { 510 cfaa.name = "padlock"; 511 ci->ci_padlock = config_found_ia(self, 512 "cpufeaturebus", &cfaa, NULL); 513 } 514 515 if (ci->ci_temperature == NULL) { 516 cfaa.name = "temperature"; 517 ci->ci_temperature = config_found_ia(self, 518 "cpufeaturebus", &cfaa, NULL); 519 } 520 521 if (ci->ci_vm == NULL) { 522 cfaa.name = "vm"; 523 ci->ci_vm = config_found_ia(self, 524 "cpufeaturebus", &cfaa, NULL); 525 } 526 } 527 528 return 0; 529 } 530 531 static void 532 cpu_childdetached(device_t self, device_t child) 533 { 534 struct cpu_softc *sc = device_private(self); 535 struct cpu_info *ci = sc->sc_info; 536 537 if (ci->ci_frequency == child) 538 ci->ci_frequency = NULL; 539 540 if (ci->ci_padlock == child) 541 ci->ci_padlock = NULL; 542 543 if (ci->ci_temperature == child) 544 ci->ci_temperature = NULL; 545 546 if (ci->ci_vm == child) 547 ci->ci_vm = NULL; 548 } 549 550 /* 551 * Initialize the processor appropriately. 552 */ 553 554 void 555 cpu_init(struct cpu_info *ci) 556 { 557 558 lcr0(rcr0() | CR0_WP); 559 560 /* 561 * On a P6 or above, enable global TLB caching if the 562 * hardware supports it. 563 */ 564 if (cpu_feature[0] & CPUID_PGE) 565 lcr4(rcr4() | CR4_PGE); /* enable global TLB caching */ 566 567 /* 568 * If we have FXSAVE/FXRESTOR, use them. 569 */ 570 if (cpu_feature[0] & CPUID_FXSR) { 571 lcr4(rcr4() | CR4_OSFXSR); 572 573 /* 574 * If we have SSE/SSE2, enable XMM exceptions. 575 */ 576 if (cpu_feature[0] & (CPUID_SSE|CPUID_SSE2)) 577 lcr4(rcr4() | CR4_OSXMMEXCPT); 578 } 579 580 #ifdef MTRR 581 /* 582 * On a P6 or above, initialize MTRR's if the hardware supports them. 583 */ 584 if (cpu_feature[0] & CPUID_MTRR) { 585 if ((ci->ci_flags & CPUF_AP) == 0) 586 i686_mtrr_init_first(); 587 mtrr_init_cpu(ci); 588 } 589 590 #ifdef i386 591 if (strcmp((char *)(ci->ci_vendor), "AuthenticAMD") == 0) { 592 /* 593 * Must be a K6-2 Step >= 7 or a K6-III. 594 */ 595 if (CPUID_TO_FAMILY(ci->ci_signature) == 5) { 596 if (CPUID_TO_MODEL(ci->ci_signature) > 8 || 597 (CPUID_TO_MODEL(ci->ci_signature) == 8 && 598 CPUID_TO_STEPPING(ci->ci_signature) >= 7)) { 599 mtrr_funcs = &k6_mtrr_funcs; 600 k6_mtrr_init_first(); 601 mtrr_init_cpu(ci); 602 } 603 } 604 } 605 #endif /* i386 */ 606 #endif /* MTRR */ 607 608 if (ci != &cpu_info_primary) { 609 /* Synchronize TSC again, and check for drift. */ 610 wbinvd(); 611 atomic_or_32(&ci->ci_flags, CPUF_RUNNING); 612 tsc_sync_ap(ci); 613 } else { 614 atomic_or_32(&ci->ci_flags, CPUF_RUNNING); 615 } 616 } 617 618 #ifdef MULTIPROCESSOR 619 void 620 cpu_boot_secondary_processors(void) 621 { 622 struct cpu_info *ci; 623 kcpuset_t *cpus; 624 u_long i; 625 626 /* Now that we know the number of CPUs, patch the text segment. */ 627 x86_patch(false); 628 629 kcpuset_create(&cpus, true); 630 kcpuset_set(cpus, cpu_index(curcpu())); 631 for (i = 0; i < maxcpus; i++) { 632 ci = cpu_lookup(i); 633 if (ci == NULL) 634 continue; 635 if (ci->ci_data.cpu_idlelwp == NULL) 636 continue; 637 if ((ci->ci_flags & CPUF_PRESENT) == 0) 638 continue; 639 if (ci->ci_flags & (CPUF_BSP|CPUF_SP|CPUF_PRIMARY)) 640 continue; 641 cpu_boot_secondary(ci); 642 kcpuset_set(cpus, cpu_index(ci)); 643 } 644 while (!kcpuset_match(cpus, kcpuset_running)) 645 ; 646 kcpuset_destroy(cpus); 647 648 x86_mp_online = true; 649 650 /* Now that we know about the TSC, attach the timecounter. */ 651 tsc_tc_init(); 652 653 /* Enable zeroing of pages in the idle loop if we have SSE2. */ 654 vm_page_zero_enable = ((cpu_feature[0] & CPUID_SSE2) != 0); 655 } 656 #endif 657 658 static void 659 cpu_init_idle_lwp(struct cpu_info *ci) 660 { 661 struct lwp *l = ci->ci_data.cpu_idlelwp; 662 struct pcb *pcb = lwp_getpcb(l); 663 664 pcb->pcb_cr0 = rcr0(); 665 } 666 667 void 668 cpu_init_idle_lwps(void) 669 { 670 struct cpu_info *ci; 671 u_long i; 672 673 for (i = 0; i < maxcpus; i++) { 674 ci = cpu_lookup(i); 675 if (ci == NULL) 676 continue; 677 if (ci->ci_data.cpu_idlelwp == NULL) 678 continue; 679 if ((ci->ci_flags & CPUF_PRESENT) == 0) 680 continue; 681 cpu_init_idle_lwp(ci); 682 } 683 } 684 685 #ifdef MULTIPROCESSOR 686 void 687 cpu_start_secondary(struct cpu_info *ci) 688 { 689 extern paddr_t mp_pdirpa; 690 u_long psl; 691 int i; 692 693 mp_pdirpa = pmap_init_tmp_pgtbl(mp_trampoline_paddr); 694 atomic_or_32(&ci->ci_flags, CPUF_AP); 695 ci->ci_curlwp = ci->ci_data.cpu_idlelwp; 696 if (CPU_STARTUP(ci, mp_trampoline_paddr) != 0) { 697 return; 698 } 699 700 /* 701 * Wait for it to become ready. Setting cpu_starting opens the 702 * initial gate and allows the AP to start soft initialization. 703 */ 704 KASSERT(cpu_starting == NULL); 705 cpu_starting = ci; 706 for (i = 100000; (!(ci->ci_flags & CPUF_PRESENT)) && i > 0; i--) { 707 #ifdef MPDEBUG 708 extern int cpu_trace[3]; 709 static int otrace[3]; 710 if (memcmp(otrace, cpu_trace, sizeof(otrace)) != 0) { 711 aprint_debug_dev(ci->ci_dev, "trace %02x %02x %02x\n", 712 cpu_trace[0], cpu_trace[1], cpu_trace[2]); 713 memcpy(otrace, cpu_trace, sizeof(otrace)); 714 } 715 #endif 716 i8254_delay(10); 717 } 718 719 if ((ci->ci_flags & CPUF_PRESENT) == 0) { 720 aprint_error_dev(ci->ci_dev, "failed to become ready\n"); 721 #if defined(MPDEBUG) && defined(DDB) 722 printf("dropping into debugger; continue from here to resume boot\n"); 723 Debugger(); 724 #endif 725 } else { 726 /* 727 * Synchronize time stamp counters. Invalidate cache and do 728 * twice to try and minimize possible cache effects. Disable 729 * interrupts to try and rule out any external interference. 730 */ 731 psl = x86_read_psl(); 732 x86_disable_intr(); 733 wbinvd(); 734 tsc_sync_bp(ci); 735 x86_write_psl(psl); 736 } 737 738 CPU_START_CLEANUP(ci); 739 cpu_starting = NULL; 740 } 741 742 void 743 cpu_boot_secondary(struct cpu_info *ci) 744 { 745 int64_t drift; 746 u_long psl; 747 int i; 748 749 atomic_or_32(&ci->ci_flags, CPUF_GO); 750 for (i = 100000; (!(ci->ci_flags & CPUF_RUNNING)) && i > 0; i--) { 751 i8254_delay(10); 752 } 753 if ((ci->ci_flags & CPUF_RUNNING) == 0) { 754 aprint_error_dev(ci->ci_dev, "failed to start\n"); 755 #if defined(MPDEBUG) && defined(DDB) 756 printf("dropping into debugger; continue from here to resume boot\n"); 757 Debugger(); 758 #endif 759 } else { 760 /* Synchronize TSC again, check for drift. */ 761 drift = ci->ci_data.cpu_cc_skew; 762 psl = x86_read_psl(); 763 x86_disable_intr(); 764 wbinvd(); 765 tsc_sync_bp(ci); 766 x86_write_psl(psl); 767 drift -= ci->ci_data.cpu_cc_skew; 768 aprint_debug_dev(ci->ci_dev, "TSC skew=%lld drift=%lld\n", 769 (long long)ci->ci_data.cpu_cc_skew, (long long)drift); 770 tsc_sync_drift(drift); 771 } 772 } 773 774 /* 775 * The CPU ends up here when its ready to run 776 * This is called from code in mptramp.s; at this point, we are running 777 * in the idle pcb/idle stack of the new CPU. When this function returns, 778 * this processor will enter the idle loop and start looking for work. 779 */ 780 void 781 cpu_hatch(void *v) 782 { 783 struct cpu_info *ci = (struct cpu_info *)v; 784 struct pcb *pcb; 785 int s, i; 786 787 cpu_init_msrs(ci, true); 788 cpu_probe(ci); 789 790 ci->ci_data.cpu_cc_freq = cpu_info_primary.ci_data.cpu_cc_freq; 791 /* cpu_get_tsc_freq(ci); */ 792 793 KDASSERT((ci->ci_flags & CPUF_PRESENT) == 0); 794 795 /* 796 * Synchronize time stamp counters. Invalidate cache and do twice 797 * to try and minimize possible cache effects. Note that interrupts 798 * are off at this point. 799 */ 800 wbinvd(); 801 atomic_or_32(&ci->ci_flags, CPUF_PRESENT); 802 tsc_sync_ap(ci); 803 804 /* 805 * Wait to be brought online. Use 'monitor/mwait' if available, 806 * in order to make the TSC drift as much as possible. so that 807 * we can detect it later. If not available, try 'pause'. 808 * We'd like to use 'hlt', but we have interrupts off. 809 */ 810 while ((ci->ci_flags & CPUF_GO) == 0) { 811 if ((cpu_feature[1] & CPUID2_MONITOR) != 0) { 812 x86_monitor(&ci->ci_flags, 0, 0); 813 if ((ci->ci_flags & CPUF_GO) != 0) { 814 continue; 815 } 816 x86_mwait(0, 0); 817 } else { 818 for (i = 10000; i != 0; i--) { 819 x86_pause(); 820 } 821 } 822 } 823 824 /* Because the text may have been patched in x86_patch(). */ 825 wbinvd(); 826 x86_flush(); 827 tlbflushg(); 828 829 KASSERT((ci->ci_flags & CPUF_RUNNING) == 0); 830 831 #ifdef PAE 832 pd_entry_t * l3_pd = ci->ci_pae_l3_pdir; 833 for (i = 0 ; i < PDP_SIZE; i++) { 834 l3_pd[i] = pmap_kernel()->pm_pdirpa[i] | PG_V; 835 } 836 lcr3(ci->ci_pae_l3_pdirpa); 837 #else 838 lcr3(pmap_pdirpa(pmap_kernel(), 0)); 839 #endif 840 841 pcb = lwp_getpcb(curlwp); 842 pcb->pcb_cr3 = rcr3(); 843 pcb = lwp_getpcb(ci->ci_data.cpu_idlelwp); 844 lcr0(pcb->pcb_cr0); 845 846 cpu_init_idt(); 847 gdt_init_cpu(ci); 848 lapic_enable(); 849 lapic_set_lvt(); 850 lapic_initclocks(); 851 852 #ifdef i386 853 #if NNPX > 0 854 npxinit(ci); 855 #endif 856 #else 857 fpuinit(ci); 858 #endif 859 lldt(GSYSSEL(GLDT_SEL, SEL_KPL)); 860 ltr(ci->ci_tss_sel); 861 862 cpu_init(ci); 863 cpu_get_tsc_freq(ci); 864 865 s = splhigh(); 866 #ifdef i386 867 lapic_tpr = 0; 868 #else 869 lcr8(0); 870 #endif 871 x86_enable_intr(); 872 splx(s); 873 x86_errata(); 874 875 aprint_debug_dev(ci->ci_dev, "running\n"); 876 877 idle_loop(NULL); 878 KASSERT(false); 879 } 880 #endif 881 882 #if defined(DDB) 883 884 #include <ddb/db_output.h> 885 #include <machine/db_machdep.h> 886 887 /* 888 * Dump CPU information from ddb. 889 */ 890 void 891 cpu_debug_dump(void) 892 { 893 struct cpu_info *ci; 894 CPU_INFO_ITERATOR cii; 895 896 db_printf("addr dev id flags ipis curlwp fpcurlwp\n"); 897 for (CPU_INFO_FOREACH(cii, ci)) { 898 db_printf("%p %s %ld %x %x %10p %10p\n", 899 ci, 900 ci->ci_dev == NULL ? "BOOT" : device_xname(ci->ci_dev), 901 (long)ci->ci_cpuid, 902 ci->ci_flags, ci->ci_ipis, 903 ci->ci_curlwp, 904 ci->ci_fpcurlwp); 905 } 906 } 907 #endif 908 909 #if NLAPIC > 0 910 static void 911 cpu_copy_trampoline(void) 912 { 913 /* 914 * Copy boot code. 915 */ 916 extern u_char cpu_spinup_trampoline[]; 917 extern u_char cpu_spinup_trampoline_end[]; 918 919 vaddr_t mp_trampoline_vaddr; 920 921 mp_trampoline_vaddr = uvm_km_alloc(kernel_map, PAGE_SIZE, 0, 922 UVM_KMF_VAONLY); 923 924 pmap_kenter_pa(mp_trampoline_vaddr, mp_trampoline_paddr, 925 VM_PROT_READ | VM_PROT_WRITE, 0); 926 pmap_update(pmap_kernel()); 927 memcpy((void *)mp_trampoline_vaddr, 928 cpu_spinup_trampoline, 929 cpu_spinup_trampoline_end - cpu_spinup_trampoline); 930 931 pmap_kremove(mp_trampoline_vaddr, PAGE_SIZE); 932 pmap_update(pmap_kernel()); 933 uvm_km_free(kernel_map, mp_trampoline_vaddr, PAGE_SIZE, UVM_KMF_VAONLY); 934 } 935 #endif 936 937 #ifdef i386 938 static void 939 tss_init(struct i386tss *tss, void *stack, void *func) 940 { 941 KASSERT(curcpu()->ci_pmap == pmap_kernel()); 942 943 memset(tss, 0, sizeof *tss); 944 tss->tss_esp0 = tss->tss_esp = (int)((char *)stack + USPACE - 16); 945 tss->tss_ss0 = GSEL(GDATA_SEL, SEL_KPL); 946 tss->__tss_cs = GSEL(GCODE_SEL, SEL_KPL); 947 tss->tss_fs = GSEL(GCPU_SEL, SEL_KPL); 948 tss->tss_gs = tss->__tss_es = tss->__tss_ds = 949 tss->__tss_ss = GSEL(GDATA_SEL, SEL_KPL); 950 /* %cr3 contains the value associated to pmap_kernel */ 951 tss->tss_cr3 = rcr3(); 952 tss->tss_esp = (int)((char *)stack + USPACE - 16); 953 tss->tss_ldt = GSEL(GLDT_SEL, SEL_KPL); 954 tss->__tss_eflags = PSL_MBO | PSL_NT; /* XXX not needed? */ 955 tss->__tss_eip = (int)func; 956 } 957 958 /* XXX */ 959 #define IDTVEC(name) __CONCAT(X, name) 960 typedef void (vector)(void); 961 extern vector IDTVEC(tss_trap08); 962 #if defined(DDB) && defined(MULTIPROCESSOR) 963 extern vector Xintrddbipi; 964 extern int ddb_vec; 965 #endif 966 967 static void 968 cpu_set_tss_gates(struct cpu_info *ci) 969 { 970 struct segment_descriptor sd; 971 972 ci->ci_doubleflt_stack = (char *)uvm_km_alloc(kernel_map, USPACE, 0, 973 UVM_KMF_WIRED); 974 tss_init(&ci->ci_doubleflt_tss, ci->ci_doubleflt_stack, 975 IDTVEC(tss_trap08)); 976 setsegment(&sd, &ci->ci_doubleflt_tss, sizeof(struct i386tss) - 1, 977 SDT_SYS386TSS, SEL_KPL, 0, 0); 978 ci->ci_gdt[GTRAPTSS_SEL].sd = sd; 979 setgate(&idt[8], NULL, 0, SDT_SYSTASKGT, SEL_KPL, 980 GSEL(GTRAPTSS_SEL, SEL_KPL)); 981 982 #if defined(DDB) && defined(MULTIPROCESSOR) 983 /* 984 * Set up separate handler for the DDB IPI, so that it doesn't 985 * stomp on a possibly corrupted stack. 986 * 987 * XXX overwriting the gate set in db_machine_init. 988 * Should rearrange the code so that it's set only once. 989 */ 990 ci->ci_ddbipi_stack = (char *)uvm_km_alloc(kernel_map, USPACE, 0, 991 UVM_KMF_WIRED); 992 tss_init(&ci->ci_ddbipi_tss, ci->ci_ddbipi_stack, Xintrddbipi); 993 994 setsegment(&sd, &ci->ci_ddbipi_tss, sizeof(struct i386tss) - 1, 995 SDT_SYS386TSS, SEL_KPL, 0, 0); 996 ci->ci_gdt[GIPITSS_SEL].sd = sd; 997 998 setgate(&idt[ddb_vec], NULL, 0, SDT_SYSTASKGT, SEL_KPL, 999 GSEL(GIPITSS_SEL, SEL_KPL)); 1000 #endif 1001 } 1002 #else 1003 static void 1004 cpu_set_tss_gates(struct cpu_info *ci) 1005 { 1006 1007 } 1008 #endif /* i386 */ 1009 1010 #ifdef MULTIPROCESSOR 1011 int 1012 mp_cpu_start(struct cpu_info *ci, paddr_t target) 1013 { 1014 unsigned short dwordptr[2]; 1015 int error; 1016 1017 /* 1018 * Bootstrap code must be addressable in real mode 1019 * and it must be page aligned. 1020 */ 1021 KASSERT(target < 0x10000 && target % PAGE_SIZE == 0); 1022 1023 /* 1024 * "The BSP must initialize CMOS shutdown code to 0Ah ..." 1025 */ 1026 1027 outb(IO_RTC, NVRAM_RESET); 1028 outb(IO_RTC+1, NVRAM_RESET_JUMP); 1029 1030 /* 1031 * "and the warm reset vector (DWORD based at 40:67) to point 1032 * to the AP startup code ..." 1033 */ 1034 1035 dwordptr[0] = 0; 1036 dwordptr[1] = target >> 4; 1037 1038 memcpy((uint8_t *)cmos_data_mapping + 0x467, dwordptr, 4); 1039 1040 if ((cpu_feature[0] & CPUID_APIC) == 0) { 1041 aprint_error("mp_cpu_start: CPU does not have APIC\n"); 1042 return ENODEV; 1043 } 1044 1045 /* 1046 * ... prior to executing the following sequence:". We'll also add in 1047 * local cache flush, in case the BIOS has left the AP with its cache 1048 * disabled. It may not be able to cope with MP coherency. 1049 */ 1050 wbinvd(); 1051 1052 if (ci->ci_flags & CPUF_AP) { 1053 error = x86_ipi_init(ci->ci_cpuid); 1054 if (error != 0) { 1055 aprint_error_dev(ci->ci_dev, "%s: IPI not taken (1)\n", 1056 __func__); 1057 return error; 1058 } 1059 i8254_delay(10000); 1060 1061 error = x86_ipi_startup(ci->ci_cpuid, target / PAGE_SIZE); 1062 if (error != 0) { 1063 aprint_error_dev(ci->ci_dev, "%s: IPI not taken (2)\n", 1064 __func__); 1065 return error; 1066 } 1067 i8254_delay(200); 1068 1069 error = x86_ipi_startup(ci->ci_cpuid, target / PAGE_SIZE); 1070 if (error != 0) { 1071 aprint_error_dev(ci->ci_dev, "%s: IPI not taken (3)\n", 1072 __func__); 1073 return error; 1074 } 1075 i8254_delay(200); 1076 } 1077 1078 return 0; 1079 } 1080 1081 void 1082 mp_cpu_start_cleanup(struct cpu_info *ci) 1083 { 1084 /* 1085 * Ensure the NVRAM reset byte contains something vaguely sane. 1086 */ 1087 1088 outb(IO_RTC, NVRAM_RESET); 1089 outb(IO_RTC+1, NVRAM_RESET_RST); 1090 } 1091 #endif 1092 1093 #ifdef __x86_64__ 1094 typedef void (vector)(void); 1095 extern vector Xsyscall, Xsyscall32; 1096 #endif 1097 1098 void 1099 cpu_init_msrs(struct cpu_info *ci, bool full) 1100 { 1101 #ifdef __x86_64__ 1102 wrmsr(MSR_STAR, 1103 ((uint64_t)GSEL(GCODE_SEL, SEL_KPL) << 32) | 1104 ((uint64_t)LSEL(LSYSRETBASE_SEL, SEL_UPL) << 48)); 1105 wrmsr(MSR_LSTAR, (uint64_t)Xsyscall); 1106 wrmsr(MSR_CSTAR, (uint64_t)Xsyscall32); 1107 wrmsr(MSR_SFMASK, PSL_NT|PSL_T|PSL_I|PSL_C); 1108 1109 if (full) { 1110 wrmsr(MSR_FSBASE, 0); 1111 wrmsr(MSR_GSBASE, (uint64_t)ci); 1112 wrmsr(MSR_KERNELGSBASE, 0); 1113 } 1114 #endif /* __x86_64__ */ 1115 1116 if (cpu_feature[2] & CPUID_NOX) 1117 wrmsr(MSR_EFER, rdmsr(MSR_EFER) | EFER_NXE); 1118 } 1119 1120 void 1121 cpu_offline_md(void) 1122 { 1123 int s; 1124 1125 s = splhigh(); 1126 #ifdef i386 1127 #if NNPX > 0 1128 npxsave_cpu(true); 1129 #endif 1130 #else 1131 fpusave_cpu(true); 1132 #endif 1133 splx(s); 1134 } 1135 1136 /* XXX joerg restructure and restart CPUs individually */ 1137 static bool 1138 cpu_stop(device_t dv) 1139 { 1140 struct cpu_softc *sc = device_private(dv); 1141 struct cpu_info *ci = sc->sc_info; 1142 int err; 1143 1144 KASSERT((ci->ci_flags & CPUF_PRESENT) != 0); 1145 1146 if ((ci->ci_flags & CPUF_PRIMARY) != 0) 1147 return true; 1148 1149 if (ci->ci_data.cpu_idlelwp == NULL) 1150 return true; 1151 1152 sc->sc_wasonline = !(ci->ci_schedstate.spc_flags & SPCF_OFFLINE); 1153 1154 if (sc->sc_wasonline) { 1155 mutex_enter(&cpu_lock); 1156 err = cpu_setstate(ci, false); 1157 mutex_exit(&cpu_lock); 1158 1159 if (err != 0) 1160 return false; 1161 } 1162 1163 return true; 1164 } 1165 1166 static bool 1167 cpu_suspend(device_t dv, const pmf_qual_t *qual) 1168 { 1169 struct cpu_softc *sc = device_private(dv); 1170 struct cpu_info *ci = sc->sc_info; 1171 1172 if ((ci->ci_flags & CPUF_PRESENT) == 0) 1173 return true; 1174 else { 1175 cpufreq_suspend(ci); 1176 } 1177 1178 return cpu_stop(dv); 1179 } 1180 1181 static bool 1182 cpu_resume(device_t dv, const pmf_qual_t *qual) 1183 { 1184 struct cpu_softc *sc = device_private(dv); 1185 struct cpu_info *ci = sc->sc_info; 1186 int err = 0; 1187 1188 if ((ci->ci_flags & CPUF_PRESENT) == 0) 1189 return true; 1190 1191 if ((ci->ci_flags & CPUF_PRIMARY) != 0) 1192 goto out; 1193 1194 if (ci->ci_data.cpu_idlelwp == NULL) 1195 goto out; 1196 1197 if (sc->sc_wasonline) { 1198 mutex_enter(&cpu_lock); 1199 err = cpu_setstate(ci, true); 1200 mutex_exit(&cpu_lock); 1201 } 1202 1203 out: 1204 if (err != 0) 1205 return false; 1206 1207 cpufreq_resume(ci); 1208 1209 return true; 1210 } 1211 1212 static bool 1213 cpu_shutdown(device_t dv, int how) 1214 { 1215 struct cpu_softc *sc = device_private(dv); 1216 struct cpu_info *ci = sc->sc_info; 1217 1218 if ((ci->ci_flags & CPUF_BSP) != 0) 1219 return false; 1220 1221 if ((ci->ci_flags & CPUF_PRESENT) == 0) 1222 return true; 1223 1224 return cpu_stop(dv); 1225 } 1226 1227 void 1228 cpu_get_tsc_freq(struct cpu_info *ci) 1229 { 1230 uint64_t last_tsc; 1231 1232 if (cpu_hascounter()) { 1233 last_tsc = cpu_counter_serializing(); 1234 i8254_delay(100000); 1235 ci->ci_data.cpu_cc_freq = 1236 (cpu_counter_serializing() - last_tsc) * 10; 1237 } 1238 } 1239 1240 void 1241 x86_cpu_idle_mwait(void) 1242 { 1243 struct cpu_info *ci = curcpu(); 1244 1245 KASSERT(ci->ci_ilevel == IPL_NONE); 1246 1247 x86_monitor(&ci->ci_want_resched, 0, 0); 1248 if (__predict_false(ci->ci_want_resched)) { 1249 return; 1250 } 1251 x86_mwait(0, 0); 1252 } 1253 1254 void 1255 x86_cpu_idle_halt(void) 1256 { 1257 struct cpu_info *ci = curcpu(); 1258 1259 KASSERT(ci->ci_ilevel == IPL_NONE); 1260 1261 x86_disable_intr(); 1262 if (!__predict_false(ci->ci_want_resched)) { 1263 x86_stihlt(); 1264 } else { 1265 x86_enable_intr(); 1266 } 1267 } 1268 1269 /* 1270 * Loads pmap for the current CPU. 1271 */ 1272 void 1273 cpu_load_pmap(struct pmap *pmap, struct pmap *oldpmap) 1274 { 1275 #ifdef PAE 1276 struct cpu_info *ci = curcpu(); 1277 pd_entry_t *l3_pd = ci->ci_pae_l3_pdir; 1278 int i; 1279 1280 /* 1281 * disable interrupts to block TLB shootdowns, which can reload cr3. 1282 * while this doesn't block NMIs, it's probably ok as NMIs unlikely 1283 * reload cr3. 1284 */ 1285 x86_disable_intr(); 1286 for (i = 0 ; i < PDP_SIZE; i++) { 1287 l3_pd[i] = pmap->pm_pdirpa[i] | PG_V; 1288 } 1289 x86_enable_intr(); 1290 tlbflush(); 1291 #else /* PAE */ 1292 lcr3(pmap_pdirpa(pmap, 0)); 1293 #endif /* PAE */ 1294 } 1295 1296 /* 1297 * Notify all other cpus to halt. 1298 */ 1299 1300 void 1301 cpu_broadcast_halt(void) 1302 { 1303 x86_broadcast_ipi(X86_IPI_HALT); 1304 } 1305 1306 /* 1307 * Send a dummy ipi to a cpu to force it to run splraise()/spllower() 1308 */ 1309 1310 void 1311 cpu_kick(struct cpu_info *ci) 1312 { 1313 x86_send_ipi(ci, 0); 1314 } 1315
Indexes created Thu Sep 25 16:09:42 GMT 2025