1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include <sys/types.h> 30 #include <sys/thread.h> 31 #include <sys/cpuvar.h> 32 #include <sys/t_lock.h> 33 #include <sys/param.h> 34 #include <sys/proc.h> 35 #include <sys/disp.h> 36 #include <sys/class.h> 37 #include <sys/cmn_err.h> 38 #include <sys/debug.h> 39 #include <sys/asm_linkage.h> 40 #include <sys/x_call.h> 41 #include <sys/systm.h> 42 #include <sys/var.h> 43 #include <sys/vtrace.h> 44 #include <vm/hat.h> 45 #include <vm/as.h> 46 #include <vm/seg_kmem.h> 47 #include <vm/seg_kp.h> 48 #include <sys/segments.h> 49 #include <sys/kmem.h> 50 #include <sys/stack.h> 51 #include <sys/smp_impldefs.h> 52 #include <sys/x86_archext.h> 53 #include <sys/machsystm.h> 54 #include <sys/traptrace.h> 55 #include <sys/clock.h> 56 #include <sys/cpc_impl.h> 57 #include <sys/pg.h> 58 #include <sys/cmt.h> 59 #include <sys/dtrace.h> 60 #include <sys/archsystm.h> 61 #include <sys/fp.h> 62 #include <sys/reboot.h> 63 #include <sys/kdi_machimpl.h> 64 #include <vm/hat_i86.h> 65 #include <sys/memnode.h> 66 #include <sys/pci_cfgspace.h> 67 #include <sys/mach_mmu.h> 68 #include <sys/sysmacros.h> 69 #include <sys/cpu_module.h> 70 71 struct cpu cpus[1]; /* CPU data */ 72 struct cpu *cpu[NCPU] = {&cpus[0]}; /* pointers to all CPUs */ 73 cpu_core_t cpu_core[NCPU]; /* cpu_core structures */ 74 75 /* 76 * Useful for disabling MP bring-up on a MP capable system. 77 */ 78 int use_mp = 1; 79 80 /* 81 * to be set by a PSM to indicate what cpus 82 * are sitting around on the system. 83 */ 84 cpuset_t mp_cpus; 85 86 /* 87 * This variable is used by the hat layer to decide whether or not 88 * critical sections are needed to prevent race conditions. For sun4m, 89 * this variable is set once enough MP initialization has been done in 90 * order to allow cross calls. 91 */ 92 int flushes_require_xcalls; 93 cpuset_t cpu_ready_set = 1; 94 95 static void mp_startup(void); 96 97 static void cpu_sep_enable(void); 98 static void cpu_sep_disable(void); 99 static void cpu_asysc_enable(void); 100 static void cpu_asysc_disable(void); 101 102 extern int tsc_gethrtime_enable; 103 104 /* 105 * Init CPU info - get CPU type info for processor_info system call. 106 */ 107 void 108 init_cpu_info(struct cpu *cp) 109 { 110 processor_info_t *pi = &cp->cpu_type_info; 111 char buf[CPU_IDSTRLEN]; 112 113 /* 114 * Get clock-frequency property for the CPU. 115 */ 116 pi->pi_clock = cpu_freq; 117 118 /* 119 * Current frequency in Hz. 120 */ 121 pi->pi_curr_clock = cpu_freq_hz; 122 123 (void) strcpy(pi->pi_processor_type, "i386"); 124 if (fpu_exists) 125 (void) strcpy(pi->pi_fputypes, "i387 compatible"); 126 127 (void) cpuid_getidstr(cp, buf, sizeof (buf)); 128 129 cp->cpu_idstr = kmem_alloc(strlen(buf) + 1, KM_SLEEP); 130 (void) strcpy(cp->cpu_idstr, buf); 131 132 cmn_err(CE_CONT, "?cpu%d: %s\n", cp->cpu_id, cp->cpu_idstr); 133 134 (void) cpuid_getbrandstr(cp, buf, sizeof (buf)); 135 cp->cpu_brandstr = kmem_alloc(strlen(buf) + 1, KM_SLEEP); 136 (void) strcpy(cp->cpu_brandstr, buf); 137 138 cmn_err(CE_CONT, "?cpu%d: %s\n", cp->cpu_id, cp->cpu_brandstr); 139 } 140 141 /* 142 * Configure syscall support on this CPU. 143 */ 144 /*ARGSUSED*/ 145 static void 146 init_cpu_syscall(struct cpu *cp) 147 { 148 kpreempt_disable(); 149 150 #if defined(__amd64) 151 if ((x86_feature & (X86_MSR | X86_ASYSC)) == (X86_MSR | X86_ASYSC)) { 152 153 #if !defined(__lint) 154 /* 155 * The syscall instruction imposes a certain ordering on 156 * segment selectors, so we double-check that ordering 157 * here. 158 */ 159 ASSERT(KDS_SEL == KCS_SEL + 8); 160 ASSERT(UDS_SEL == U32CS_SEL + 8); 161 ASSERT(UCS_SEL == U32CS_SEL + 16); 162 #endif 163 /* 164 * Turn syscall/sysret extensions on. 165 */ 166 cpu_asysc_enable(); 167 168 /* 169 * Program the magic registers .. 170 */ 171 wrmsr(MSR_AMD_STAR, 172 ((uint64_t)(U32CS_SEL << 16 | KCS_SEL)) << 32); 173 wrmsr(MSR_AMD_LSTAR, (uint64_t)(uintptr_t)sys_syscall); 174 wrmsr(MSR_AMD_CSTAR, (uint64_t)(uintptr_t)sys_syscall32); 175 176 /* 177 * This list of flags is masked off the incoming 178 * %rfl when we enter the kernel. 179 */ 180 wrmsr(MSR_AMD_SFMASK, (uint64_t)(uintptr_t)(PS_IE | PS_T)); 181 } 182 #endif 183 184 /* 185 * On 32-bit kernels, we use sysenter/sysexit because it's too 186 * hard to use syscall/sysret, and it is more portable anyway. 187 * 188 * On 64-bit kernels on Nocona machines, the 32-bit syscall 189 * variant isn't available to 32-bit applications, but sysenter is. 190 */ 191 if ((x86_feature & (X86_MSR | X86_SEP)) == (X86_MSR | X86_SEP)) { 192 193 #if !defined(__lint) 194 /* 195 * The sysenter instruction imposes a certain ordering on 196 * segment selectors, so we double-check that ordering 197 * here. See "sysenter" in Intel document 245471-012, "IA-32 198 * Intel Architecture Software Developer's Manual Volume 2: 199 * Instruction Set Reference" 200 */ 201 ASSERT(KDS_SEL == KCS_SEL + 8); 202 203 ASSERT32(UCS_SEL == ((KCS_SEL + 16) | 3)); 204 ASSERT32(UDS_SEL == UCS_SEL + 8); 205 206 ASSERT64(U32CS_SEL == ((KCS_SEL + 16) | 3)); 207 ASSERT64(UDS_SEL == U32CS_SEL + 8); 208 #endif 209 210 cpu_sep_enable(); 211 212 /* 213 * resume() sets this value to the base of the threads stack 214 * via a context handler. 215 */ 216 wrmsr(MSR_INTC_SEP_ESP, 0); 217 wrmsr(MSR_INTC_SEP_EIP, (uint64_t)(uintptr_t)sys_sysenter); 218 } 219 220 kpreempt_enable(); 221 } 222 223 /* 224 * Multiprocessor initialization. 225 * 226 * Allocate and initialize the cpu structure, TRAPTRACE buffer, and the 227 * startup and idle threads for the specified CPU. 228 */ 229 struct cpu * 230 mp_startup_init(int cpun) 231 { 232 struct cpu *cp; 233 kthread_id_t tp; 234 caddr_t sp; 235 proc_t *procp; 236 extern void idle(); 237 238 #ifdef TRAPTRACE 239 trap_trace_ctl_t *ttc = &trap_trace_ctl[cpun]; 240 #endif 241 242 ASSERT(cpun < NCPU && cpu[cpun] == NULL); 243 244 cp = kmem_zalloc(sizeof (*cp), KM_SLEEP); 245 if (x86_feature & X86_MWAIT) 246 cp->cpu_m.mcpu_mwait = mach_alloc_mwait(CPU); 247 248 procp = curthread->t_procp; 249 250 mutex_enter(&cpu_lock); 251 /* 252 * Initialize the dispatcher first. 253 */ 254 disp_cpu_init(cp); 255 mutex_exit(&cpu_lock); 256 257 cpu_vm_data_init(cp); 258 259 /* 260 * Allocate and initialize the startup thread for this CPU. 261 * Interrupt and process switch stacks get allocated later 262 * when the CPU starts running. 263 */ 264 tp = thread_create(NULL, 0, NULL, NULL, 0, procp, 265 TS_STOPPED, maxclsyspri); 266 267 /* 268 * Set state to TS_ONPROC since this thread will start running 269 * as soon as the CPU comes online. 270 * 271 * All the other fields of the thread structure are setup by 272 * thread_create(). 273 */ 274 THREAD_ONPROC(tp, cp); 275 tp->t_preempt = 1; 276 tp->t_bound_cpu = cp; 277 tp->t_affinitycnt = 1; 278 tp->t_cpu = cp; 279 tp->t_disp_queue = cp->cpu_disp; 280 281 /* 282 * Setup thread to start in mp_startup. 283 */ 284 sp = tp->t_stk; 285 tp->t_pc = (uintptr_t)mp_startup; 286 tp->t_sp = (uintptr_t)(sp - MINFRAME); 287 #if defined(__amd64) 288 tp->t_sp -= STACK_ENTRY_ALIGN; /* fake a call */ 289 #endif 290 291 cp->cpu_id = cpun; 292 cp->cpu_self = cp; 293 cp->cpu_thread = tp; 294 cp->cpu_lwp = NULL; 295 cp->cpu_dispthread = tp; 296 cp->cpu_dispatch_pri = DISP_PRIO(tp); 297 298 /* 299 * cpu_base_spl must be set explicitly here to prevent any blocking 300 * operations in mp_startup from causing the spl of the cpu to drop 301 * to 0 (allowing device interrupts before we're ready) in resume(). 302 * cpu_base_spl MUST remain at LOCK_LEVEL until the cpu is CPU_READY. 303 * As an extra bit of security on DEBUG kernels, this is enforced with 304 * an assertion in mp_startup() -- before cpu_base_spl is set to its 305 * proper value. 306 */ 307 cp->cpu_base_spl = ipltospl(LOCK_LEVEL); 308 309 /* 310 * Now, initialize per-CPU idle thread for this CPU. 311 */ 312 tp = thread_create(NULL, PAGESIZE, idle, NULL, 0, procp, TS_ONPROC, -1); 313 314 cp->cpu_idle_thread = tp; 315 316 tp->t_preempt = 1; 317 tp->t_bound_cpu = cp; 318 tp->t_affinitycnt = 1; 319 tp->t_cpu = cp; 320 tp->t_disp_queue = cp->cpu_disp; 321 322 /* 323 * Bootstrap the CPU's PG data 324 */ 325 pg_cpu_bootstrap(cp); 326 327 /* 328 * Perform CPC initialization on the new CPU. 329 */ 330 kcpc_hw_init(cp); 331 332 /* 333 * Allocate virtual addresses for cpu_caddr1 and cpu_caddr2 334 * for each CPU. 335 */ 336 setup_vaddr_for_ppcopy(cp); 337 338 /* 339 * Allocate page for new GDT and initialize from current GDT. 340 */ 341 #if !defined(__lint) 342 ASSERT((sizeof (*cp->cpu_gdt) * NGDT) <= PAGESIZE); 343 #endif 344 cp->cpu_m.mcpu_gdt = kmem_zalloc(PAGESIZE, KM_SLEEP); 345 bcopy(CPU->cpu_m.mcpu_gdt, cp->cpu_m.mcpu_gdt, 346 (sizeof (*cp->cpu_m.mcpu_gdt) * NGDT)); 347 348 #if defined(__i386) 349 /* 350 * setup kernel %gs. 351 */ 352 set_usegd(&cp->cpu_gdt[GDT_GS], cp, sizeof (struct cpu) -1, SDT_MEMRWA, 353 SEL_KPL, 0, 1); 354 #endif 355 356 /* 357 * If we have more than one node, each cpu gets a copy of IDT 358 * local to its node. If this is a Pentium box, we use cpu 0's 359 * IDT. cpu 0's IDT has been made read-only to workaround the 360 * cmpxchgl register bug 361 */ 362 if (system_hardware.hd_nodes && x86_type != X86_TYPE_P5) { 363 struct machcpu *mcpu = &cp->cpu_m; 364 365 mcpu->mcpu_idt = kmem_alloc(sizeof (idt0), KM_SLEEP); 366 bcopy(idt0, mcpu->mcpu_idt, sizeof (idt0)); 367 } else { 368 cp->cpu_m.mcpu_idt = CPU->cpu_m.mcpu_idt; 369 } 370 371 /* 372 * Get interrupt priority data from cpu 0. 373 */ 374 cp->cpu_pri_data = CPU->cpu_pri_data; 375 376 /* 377 * alloc space for cpuid info 378 */ 379 cpuid_alloc_space(cp); 380 381 /* 382 * alloc space for ucode_info 383 */ 384 ucode_alloc_space(cp); 385 386 hat_cpu_online(cp); 387 388 #ifdef TRAPTRACE 389 /* 390 * If this is a TRAPTRACE kernel, allocate TRAPTRACE buffers 391 */ 392 ttc->ttc_first = (uintptr_t)kmem_zalloc(trap_trace_bufsize, KM_SLEEP); 393 ttc->ttc_next = ttc->ttc_first; 394 ttc->ttc_limit = ttc->ttc_first + trap_trace_bufsize; 395 #endif 396 /* 397 * Record that we have another CPU. 398 */ 399 mutex_enter(&cpu_lock); 400 /* 401 * Initialize the interrupt threads for this CPU 402 */ 403 cpu_intr_alloc(cp, NINTR_THREADS); 404 /* 405 * Add CPU to list of available CPUs. It'll be on the active list 406 * after mp_startup(). 407 */ 408 cpu_add_unit(cp); 409 mutex_exit(&cpu_lock); 410 411 return (cp); 412 } 413 414 /* 415 * Undo what was done in mp_startup_init 416 */ 417 static void 418 mp_startup_fini(struct cpu *cp, int error) 419 { 420 mutex_enter(&cpu_lock); 421 422 /* 423 * Remove the CPU from the list of available CPUs. 424 */ 425 cpu_del_unit(cp->cpu_id); 426 427 if (error == ETIMEDOUT) { 428 /* 429 * The cpu was started, but never *seemed* to run any 430 * code in the kernel; it's probably off spinning in its 431 * own private world, though with potential references to 432 * our kmem-allocated IDTs and GDTs (for example). 433 * 434 * Worse still, it may actually wake up some time later, 435 * so rather than guess what it might or might not do, we 436 * leave the fundamental data structures intact. 437 */ 438 cp->cpu_flags = 0; 439 mutex_exit(&cpu_lock); 440 return; 441 } 442 443 /* 444 * At this point, the only threads bound to this CPU should 445 * special per-cpu threads: it's idle thread, it's pause threads, 446 * and it's interrupt threads. Clean these up. 447 */ 448 cpu_destroy_bound_threads(cp); 449 cp->cpu_idle_thread = NULL; 450 451 /* 452 * Free the interrupt stack. 453 */ 454 segkp_release(segkp, 455 cp->cpu_intr_stack - (INTR_STACK_SIZE - SA(MINFRAME))); 456 457 mutex_exit(&cpu_lock); 458 459 #ifdef TRAPTRACE 460 /* 461 * Discard the trap trace buffer 462 */ 463 { 464 trap_trace_ctl_t *ttc = &trap_trace_ctl[cp->cpu_id]; 465 466 kmem_free((void *)ttc->ttc_first, trap_trace_bufsize); 467 ttc->ttc_first = NULL; 468 } 469 #endif 470 471 hat_cpu_offline(cp); 472 473 cpuid_free_space(cp); 474 475 ucode_free_space(cp); 476 477 if (cp->cpu_m.mcpu_idt != CPU->cpu_m.mcpu_idt) 478 kmem_free(cp->cpu_m.mcpu_idt, sizeof (idt0)); 479 cp->cpu_m.mcpu_idt = NULL; 480 481 kmem_free(cp->cpu_m.mcpu_gdt, PAGESIZE); 482 cp->cpu_m.mcpu_gdt = NULL; 483 484 teardown_vaddr_for_ppcopy(cp); 485 486 kcpc_hw_fini(cp); 487 488 cp->cpu_dispthread = NULL; 489 cp->cpu_thread = NULL; /* discarded by cpu_destroy_bound_threads() */ 490 491 cpu_vm_data_destroy(cp); 492 493 mutex_enter(&cpu_lock); 494 disp_cpu_fini(cp); 495 mutex_exit(&cpu_lock); 496 497 kmem_free(cp, sizeof (*cp)); 498 } 499 500 /* 501 * Apply workarounds for known errata, and warn about those that are absent. 502 * 503 * System vendors occasionally create configurations which contain different 504 * revisions of the CPUs that are almost but not exactly the same. At the 505 * time of writing, this meant that their clock rates were the same, their 506 * feature sets were the same, but the required workaround were -not- 507 * necessarily the same. So, this routine is invoked on -every- CPU soon 508 * after starting to make sure that the resulting system contains the most 509 * pessimal set of workarounds needed to cope with *any* of the CPUs in the 510 * system. 511 * 512 * workaround_errata is invoked early in mlsetup() for CPU 0, and in 513 * mp_startup() for all slave CPUs. Slaves process workaround_errata prior 514 * to acknowledging their readiness to the master, so this routine will 515 * never be executed by multiple CPUs in parallel, thus making updates to 516 * global data safe. 517 * 518 * These workarounds are based on Rev 3.57 of the Revision Guide for 519 * AMD Athlon(tm) 64 and AMD Opteron(tm) Processors, August 2005. 520 */ 521 522 #if defined(OPTERON_ERRATUM_88) 523 int opteron_erratum_88; /* if non-zero -> at least one cpu has it */ 524 #endif 525 526 #if defined(OPTERON_ERRATUM_91) 527 int opteron_erratum_91; /* if non-zero -> at least one cpu has it */ 528 #endif 529 530 #if defined(OPTERON_ERRATUM_93) 531 int opteron_erratum_93; /* if non-zero -> at least one cpu has it */ 532 #endif 533 534 #if defined(OPTERON_ERRATUM_95) 535 int opteron_erratum_95; /* if non-zero -> at least one cpu has it */ 536 #endif 537 538 #if defined(OPTERON_ERRATUM_100) 539 int opteron_erratum_100; /* if non-zero -> at least one cpu has it */ 540 #endif 541 542 #if defined(OPTERON_ERRATUM_108) 543 int opteron_erratum_108; /* if non-zero -> at least one cpu has it */ 544 #endif 545 546 #if defined(OPTERON_ERRATUM_109) 547 int opteron_erratum_109; /* if non-zero -> at least one cpu has it */ 548 #endif 549 550 #if defined(OPTERON_ERRATUM_121) 551 int opteron_erratum_121; /* if non-zero -> at least one cpu has it */ 552 #endif 553 554 #if defined(OPTERON_ERRATUM_122) 555 int opteron_erratum_122; /* if non-zero -> at least one cpu has it */ 556 #endif 557 558 #if defined(OPTERON_ERRATUM_123) 559 int opteron_erratum_123; /* if non-zero -> at least one cpu has it */ 560 #endif 561 562 #if defined(OPTERON_ERRATUM_131) 563 int opteron_erratum_131; /* if non-zero -> at least one cpu has it */ 564 #endif 565 566 #if defined(OPTERON_WORKAROUND_6336786) 567 int opteron_workaround_6336786; /* non-zero -> WA relevant and applied */ 568 int opteron_workaround_6336786_UP = 0; /* Not needed for UP */ 569 #endif 570 571 #if defined(OPTERON_WORKAROUND_6323525) 572 int opteron_workaround_6323525; /* if non-zero -> at least one cpu has it */ 573 #endif 574 575 static void 576 workaround_warning(cpu_t *cp, uint_t erratum) 577 { 578 cmn_err(CE_WARN, "cpu%d: no workaround for erratum %u", 579 cp->cpu_id, erratum); 580 } 581 582 static void 583 workaround_applied(uint_t erratum) 584 { 585 if (erratum > 1000000) 586 cmn_err(CE_CONT, "?workaround applied for cpu issue #%d\n", 587 erratum); 588 else 589 cmn_err(CE_CONT, "?workaround applied for cpu erratum #%d\n", 590 erratum); 591 } 592 593 static void 594 msr_warning(cpu_t *cp, const char *rw, uint_t msr, int error) 595 { 596 cmn_err(CE_WARN, "cpu%d: couldn't %smsr 0x%x, error %d", 597 cp->cpu_id, rw, msr, error); 598 } 599 600 uint_t 601 workaround_errata(struct cpu *cpu) 602 { 603 uint_t missing = 0; 604 605 ASSERT(cpu == CPU); 606 607 /*LINTED*/ 608 if (cpuid_opteron_erratum(cpu, 88) > 0) { 609 /* 610 * SWAPGS May Fail To Read Correct GS Base 611 */ 612 #if defined(OPTERON_ERRATUM_88) 613 /* 614 * The workaround is an mfence in the relevant assembler code 615 */ 616 opteron_erratum_88++; 617 #else 618 workaround_warning(cpu, 88); 619 missing++; 620 #endif 621 } 622 623 if (cpuid_opteron_erratum(cpu, 91) > 0) { 624 /* 625 * Software Prefetches May Report A Page Fault 626 */ 627 #if defined(OPTERON_ERRATUM_91) 628 /* 629 * fix is in trap.c 630 */ 631 opteron_erratum_91++; 632 #else 633 workaround_warning(cpu, 91); 634 missing++; 635 #endif 636 } 637 638 if (cpuid_opteron_erratum(cpu, 93) > 0) { 639 /* 640 * RSM Auto-Halt Restart Returns to Incorrect RIP 641 */ 642 #if defined(OPTERON_ERRATUM_93) 643 /* 644 * fix is in trap.c 645 */ 646 opteron_erratum_93++; 647 #else 648 workaround_warning(cpu, 93); 649 missing++; 650 #endif 651 } 652 653 /*LINTED*/ 654 if (cpuid_opteron_erratum(cpu, 95) > 0) { 655 /* 656 * RET Instruction May Return to Incorrect EIP 657 */ 658 #if defined(OPTERON_ERRATUM_95) 659 #if defined(_LP64) 660 /* 661 * Workaround this by ensuring that 32-bit user code and 662 * 64-bit kernel code never occupy the same address 663 * range mod 4G. 664 */ 665 if (_userlimit32 > 0xc0000000ul) 666 *(uintptr_t *)&_userlimit32 = 0xc0000000ul; 667 668 /*LINTED*/ 669 ASSERT((uint32_t)COREHEAP_BASE == 0xc0000000u); 670 opteron_erratum_95++; 671 #endif /* _LP64 */ 672 #else 673 workaround_warning(cpu, 95); 674 missing++; 675 #endif 676 } 677 678 if (cpuid_opteron_erratum(cpu, 100) > 0) { 679 /* 680 * Compatibility Mode Branches Transfer to Illegal Address 681 */ 682 #if defined(OPTERON_ERRATUM_100) 683 /* 684 * fix is in trap.c 685 */ 686 opteron_erratum_100++; 687 #else 688 workaround_warning(cpu, 100); 689 missing++; 690 #endif 691 } 692 693 /*LINTED*/ 694 if (cpuid_opteron_erratum(cpu, 108) > 0) { 695 /* 696 * CPUID Instruction May Return Incorrect Model Number In 697 * Some Processors 698 */ 699 #if defined(OPTERON_ERRATUM_108) 700 /* 701 * (Our cpuid-handling code corrects the model number on 702 * those processors) 703 */ 704 #else 705 workaround_warning(cpu, 108); 706 missing++; 707 #endif 708 } 709 710 /*LINTED*/ 711 if (cpuid_opteron_erratum(cpu, 109) > 0) do { 712 /* 713 * Certain Reverse REP MOVS May Produce Unpredictable Behaviour 714 */ 715 #if defined(OPTERON_ERRATUM_109) 716 /* 717 * The "workaround" is to print a warning to upgrade the BIOS 718 */ 719 uint64_t value; 720 const uint_t msr = MSR_AMD_PATCHLEVEL; 721 int err; 722 723 if ((err = checked_rdmsr(msr, &value)) != 0) { 724 msr_warning(cpu, "rd", msr, err); 725 workaround_warning(cpu, 109); 726 missing++; 727 } 728 if (value == 0) 729 opteron_erratum_109++; 730 #else 731 workaround_warning(cpu, 109); 732 missing++; 733 #endif 734 /*CONSTANTCONDITION*/ 735 } while (0); 736 737 /*LINTED*/ 738 if (cpuid_opteron_erratum(cpu, 121) > 0) { 739 /* 740 * Sequential Execution Across Non_Canonical Boundary Caused 741 * Processor Hang 742 */ 743 #if defined(OPTERON_ERRATUM_121) 744 #if defined(_LP64) 745 /* 746 * Erratum 121 is only present in long (64 bit) mode. 747 * Workaround is to include the page immediately before the 748 * va hole to eliminate the possibility of system hangs due to 749 * sequential execution across the va hole boundary. 750 */ 751 if (opteron_erratum_121) 752 opteron_erratum_121++; 753 else { 754 if (hole_start) { 755 hole_start -= PAGESIZE; 756 } else { 757 /* 758 * hole_start not yet initialized by 759 * mmu_init. Initialize hole_start 760 * with value to be subtracted. 761 */ 762 hole_start = PAGESIZE; 763 } 764 opteron_erratum_121++; 765 } 766 #endif /* _LP64 */ 767 #else 768 workaround_warning(cpu, 121); 769 missing++; 770 #endif 771 } 772 773 /*LINTED*/ 774 if (cpuid_opteron_erratum(cpu, 122) > 0) do { 775 /* 776 * TLB Flush Filter May Cause Coherency Problem in 777 * Multiprocessor Systems 778 */ 779 #if defined(OPTERON_ERRATUM_122) 780 uint64_t value; 781 const uint_t msr = MSR_AMD_HWCR; 782 int error; 783 784 /* 785 * Erratum 122 is only present in MP configurations (multi-core 786 * or multi-processor). 787 */ 788 if (!opteron_erratum_122 && lgrp_plat_node_cnt == 1 && 789 cpuid_get_ncpu_per_chip(cpu) == 1) 790 break; 791 792 /* disable TLB Flush Filter */ 793 794 if ((error = checked_rdmsr(msr, &value)) != 0) { 795 msr_warning(cpu, "rd", msr, error); 796 workaround_warning(cpu, 122); 797 missing++; 798 } else { 799 value |= (uint64_t)AMD_HWCR_FFDIS; 800 if ((error = checked_wrmsr(msr, value)) != 0) { 801 msr_warning(cpu, "wr", msr, error); 802 workaround_warning(cpu, 122); 803 missing++; 804 } 805 } 806 opteron_erratum_122++; 807 #else 808 workaround_warning(cpu, 122); 809 missing++; 810 #endif 811 /*CONSTANTCONDITION*/ 812 } while (0); 813 814 /*LINTED*/ 815 if (cpuid_opteron_erratum(cpu, 123) > 0) do { 816 /* 817 * Bypassed Reads May Cause Data Corruption of System Hang in 818 * Dual Core Processors 819 */ 820 #if defined(OPTERON_ERRATUM_123) 821 uint64_t value; 822 const uint_t msr = MSR_AMD_PATCHLEVEL; 823 int err; 824 825 /* 826 * Erratum 123 applies only to multi-core cpus. 827 */ 828 if (cpuid_get_ncpu_per_chip(cpu) < 2) 829 break; 830 831 /* 832 * The "workaround" is to print a warning to upgrade the BIOS 833 */ 834 if ((err = checked_rdmsr(msr, &value)) != 0) { 835 msr_warning(cpu, "rd", msr, err); 836 workaround_warning(cpu, 123); 837 missing++; 838 } 839 if (value == 0) 840 opteron_erratum_123++; 841 #else 842 workaround_warning(cpu, 123); 843 missing++; 844 845 #endif 846 /*CONSTANTCONDITION*/ 847 } while (0); 848 849 /*LINTED*/ 850 if (cpuid_opteron_erratum(cpu, 131) > 0) do { 851 /* 852 * Multiprocessor Systems with Four or More Cores May Deadlock 853 * Waiting for a Probe Response 854 */ 855 #if defined(OPTERON_ERRATUM_131) 856 uint64_t nbcfg; 857 const uint_t msr = MSR_AMD_NB_CFG; 858 const uint64_t wabits = 859 AMD_NB_CFG_SRQ_HEARTBEAT | AMD_NB_CFG_SRQ_SPR; 860 int error; 861 862 /* 863 * Erratum 131 applies to any system with four or more cores. 864 */ 865 if (opteron_erratum_131) 866 break; 867 868 if (lgrp_plat_node_cnt * cpuid_get_ncpu_per_chip(cpu) < 4) 869 break; 870 871 /* 872 * Print a warning if neither of the workarounds for 873 * erratum 131 is present. 874 */ 875 if ((error = checked_rdmsr(msr, &nbcfg)) != 0) { 876 msr_warning(cpu, "rd", msr, error); 877 workaround_warning(cpu, 131); 878 missing++; 879 } else if ((nbcfg & wabits) == 0) { 880 opteron_erratum_131++; 881 } else { 882 /* cannot have both workarounds set */ 883 ASSERT((nbcfg & wabits) != wabits); 884 } 885 #else 886 workaround_warning(cpu, 131); 887 missing++; 888 #endif 889 /*CONSTANTCONDITION*/ 890 } while (0); 891 892 /* 893 * This isn't really an erratum, but for convenience the 894 * detection/workaround code lives here and in cpuid_opteron_erratum. 895 */ 896 if (cpuid_opteron_erratum(cpu, 6336786) > 0) { 897 #if defined(OPTERON_WORKAROUND_6336786) 898 /* 899 * Disable C1-Clock ramping on multi-core/multi-processor 900 * K8 platforms to guard against TSC drift. 901 */ 902 if (opteron_workaround_6336786) { 903 opteron_workaround_6336786++; 904 } else if ((lgrp_plat_node_cnt * 905 cpuid_get_ncpu_per_chip(cpu) > 1) || 906 opteron_workaround_6336786_UP) { 907 int node; 908 uint8_t data; 909 910 for (node = 0; node < lgrp_plat_node_cnt; node++) { 911 /* 912 * Clear PMM7[1:0] (function 3, offset 0x87) 913 * Northbridge device is the node id + 24. 914 */ 915 data = pci_getb_func(0, node + 24, 3, 0x87); 916 data &= 0xFC; 917 pci_putb_func(0, node + 24, 3, 0x87, data); 918 } 919 opteron_workaround_6336786++; 920 } 921 #else 922 workaround_warning(cpu, 6336786); 923 missing++; 924 #endif 925 } 926 927 /*LINTED*/ 928 /* 929 * Mutex primitives don't work as expected. 930 */ 931 if (cpuid_opteron_erratum(cpu, 6323525) > 0) { 932 #if defined(OPTERON_WORKAROUND_6323525) 933 /* 934 * This problem only occurs with 2 or more cores. If bit in 935 * MSR_BU_CFG set, then not applicable. The workaround 936 * is to patch the semaphone routines with the lfence 937 * instruction to provide necessary load memory barrier with 938 * possible subsequent read-modify-write ops. 939 * 940 * It is too early in boot to call the patch routine so 941 * set erratum variable to be done in startup_end(). 942 */ 943 if (opteron_workaround_6323525) { 944 opteron_workaround_6323525++; 945 } else if ((x86_feature & X86_SSE2) && ((lgrp_plat_node_cnt * 946 cpuid_get_ncpu_per_chip(cpu)) > 1)) { 947 if ((xrdmsr(MSR_BU_CFG) & 0x02) == 0) 948 opteron_workaround_6323525++; 949 } 950 #else 951 workaround_warning(cpu, 6323525); 952 missing++; 953 #endif 954 } 955 956 return (missing); 957 } 958 959 void 960 workaround_errata_end() 961 { 962 #if defined(OPTERON_ERRATUM_88) 963 if (opteron_erratum_88) 964 workaround_applied(88); 965 #endif 966 #if defined(OPTERON_ERRATUM_91) 967 if (opteron_erratum_91) 968 workaround_applied(91); 969 #endif 970 #if defined(OPTERON_ERRATUM_93) 971 if (opteron_erratum_93) 972 workaround_applied(93); 973 #endif 974 #if defined(OPTERON_ERRATUM_95) 975 if (opteron_erratum_95) 976 workaround_applied(95); 977 #endif 978 #if defined(OPTERON_ERRATUM_100) 979 if (opteron_erratum_100) 980 workaround_applied(100); 981 #endif 982 #if defined(OPTERON_ERRATUM_108) 983 if (opteron_erratum_108) 984 workaround_applied(108); 985 #endif 986 #if defined(OPTERON_ERRATUM_109) 987 if (opteron_erratum_109) { 988 cmn_err(CE_WARN, 989 "BIOS microcode patch for AMD Athlon(tm) 64/Opteron(tm)" 990 " processor\nerratum 109 was not detected; updating your" 991 " system's BIOS to a version\ncontaining this" 992 " microcode patch is HIGHLY recommended or erroneous" 993 " system\noperation may occur.\n"); 994 } 995 #endif 996 #if defined(OPTERON_ERRATUM_121) 997 if (opteron_erratum_121) 998 workaround_applied(121); 999 #endif 1000 #if defined(OPTERON_ERRATUM_122) 1001 if (opteron_erratum_122) 1002 workaround_applied(122); 1003 #endif 1004 #if defined(OPTERON_ERRATUM_123) 1005 if (opteron_erratum_123) { 1006 cmn_err(CE_WARN, 1007 "BIOS microcode patch for AMD Athlon(tm) 64/Opteron(tm)" 1008 " processor\nerratum 123 was not detected; updating your" 1009 " system's BIOS to a version\ncontaining this" 1010 " microcode patch is HIGHLY recommended or erroneous" 1011 " system\noperation may occur.\n"); 1012 } 1013 #endif 1014 #if defined(OPTERON_ERRATUM_131) 1015 if (opteron_erratum_131) { 1016 cmn_err(CE_WARN, 1017 "BIOS microcode patch for AMD Athlon(tm) 64/Opteron(tm)" 1018 " processor\nerratum 131 was not detected; updating your" 1019 " system's BIOS to a version\ncontaining this" 1020 " microcode patch is HIGHLY recommended or erroneous" 1021 " system\noperation may occur.\n"); 1022 } 1023 #endif 1024 #if defined(OPTERON_WORKAROUND_6336786) 1025 if (opteron_workaround_6336786) 1026 workaround_applied(6336786); 1027 #endif 1028 #if defined(OPTERON_WORKAROUND_6323525) 1029 if (opteron_workaround_6323525) 1030 workaround_applied(6323525); 1031 #endif 1032 } 1033 1034 static cpuset_t procset; 1035 1036 /* 1037 * Start a single cpu, assuming that the kernel context is available 1038 * to successfully start another cpu. 1039 * 1040 * (For example, real mode code is mapped into the right place 1041 * in memory and is ready to be run.) 1042 */ 1043 int 1044 start_cpu(processorid_t who) 1045 { 1046 void *ctx; 1047 cpu_t *cp; 1048 int delays; 1049 int error = 0; 1050 1051 ASSERT(who != 0); 1052 1053 /* 1054 * Check if there's at least a Mbyte of kmem available 1055 * before attempting to start the cpu. 1056 */ 1057 if (kmem_avail() < 1024 * 1024) { 1058 /* 1059 * Kick off a reap in case that helps us with 1060 * later attempts .. 1061 */ 1062 kmem_reap(); 1063 return (ENOMEM); 1064 } 1065 1066 cp = mp_startup_init(who); 1067 if ((ctx = mach_cpucontext_alloc(cp)) == NULL || 1068 (error = mach_cpu_start(cp, ctx)) != 0) { 1069 1070 /* 1071 * Something went wrong before we even started it 1072 */ 1073 if (ctx) 1074 cmn_err(CE_WARN, 1075 "cpu%d: failed to start error %d", 1076 cp->cpu_id, error); 1077 else 1078 cmn_err(CE_WARN, 1079 "cpu%d: failed to allocate context", cp->cpu_id); 1080 1081 if (ctx) 1082 mach_cpucontext_free(cp, ctx, error); 1083 else 1084 error = EAGAIN; /* hmm. */ 1085 mp_startup_fini(cp, error); 1086 return (error); 1087 } 1088 1089 for (delays = 0; !CPU_IN_SET(procset, who); delays++) { 1090 if (delays == 500) { 1091 /* 1092 * After five seconds, things are probably looking 1093 * a bit bleak - explain the hang. 1094 */ 1095 cmn_err(CE_NOTE, "cpu%d: started, " 1096 "but not running in the kernel yet", who); 1097 } else if (delays > 2000) { 1098 /* 1099 * We waited at least 20 seconds, bail .. 1100 */ 1101 error = ETIMEDOUT; 1102 cmn_err(CE_WARN, "cpu%d: timed out", who); 1103 mach_cpucontext_free(cp, ctx, error); 1104 mp_startup_fini(cp, error); 1105 return (error); 1106 } 1107 1108 /* 1109 * wait at least 10ms, then check again.. 1110 */ 1111 delay(USEC_TO_TICK_ROUNDUP(10000)); 1112 } 1113 1114 mach_cpucontext_free(cp, ctx, 0); 1115 1116 if (tsc_gethrtime_enable) 1117 tsc_sync_master(who); 1118 1119 if (dtrace_cpu_init != NULL) { 1120 /* 1121 * DTrace CPU initialization expects cpu_lock to be held. 1122 */ 1123 mutex_enter(&cpu_lock); 1124 (*dtrace_cpu_init)(who); 1125 mutex_exit(&cpu_lock); 1126 } 1127 1128 while (!CPU_IN_SET(cpu_ready_set, who)) 1129 delay(1); 1130 1131 return (0); 1132 } 1133 1134 1135 /*ARGSUSED*/ 1136 void 1137 start_other_cpus(int cprboot) 1138 { 1139 uint_t who; 1140 uint_t skipped = 0; 1141 uint_t bootcpuid = 0; 1142 1143 /* 1144 * Initialize our own cpu_info. 1145 */ 1146 init_cpu_info(CPU); 1147 1148 /* 1149 * Initialize our syscall handlers 1150 */ 1151 init_cpu_syscall(CPU); 1152 1153 /* 1154 * Take the boot cpu out of the mp_cpus set because we know 1155 * it's already running. Add it to the cpu_ready_set for 1156 * precisely the same reason. 1157 */ 1158 CPUSET_DEL(mp_cpus, bootcpuid); 1159 CPUSET_ADD(cpu_ready_set, bootcpuid); 1160 1161 /* 1162 * if only 1 cpu or not using MP, skip the rest of this 1163 */ 1164 if (CPUSET_ISNULL(mp_cpus) || use_mp == 0) { 1165 if (use_mp == 0) 1166 cmn_err(CE_CONT, "?***** Not in MP mode\n"); 1167 goto done; 1168 } 1169 1170 /* 1171 * perform such initialization as is needed 1172 * to be able to take CPUs on- and off-line. 1173 */ 1174 cpu_pause_init(); 1175 1176 xc_init(); /* initialize processor crosscalls */ 1177 1178 if (mach_cpucontext_init() != 0) 1179 goto done; 1180 1181 flushes_require_xcalls = 1; 1182 1183 /* 1184 * We lock our affinity to the master CPU to ensure that all slave CPUs 1185 * do their TSC syncs with the same CPU. 1186 */ 1187 affinity_set(CPU_CURRENT); 1188 1189 for (who = 0; who < NCPU; who++) { 1190 1191 if (!CPU_IN_SET(mp_cpus, who)) 1192 continue; 1193 ASSERT(who != bootcpuid); 1194 if (ncpus >= max_ncpus) { 1195 skipped = who; 1196 continue; 1197 } 1198 if (start_cpu(who) != 0) 1199 CPUSET_DEL(mp_cpus, who); 1200 } 1201 1202 /* Free the space allocated to hold the microcode file */ 1203 ucode_free(); 1204 1205 affinity_clear(); 1206 1207 if (skipped) { 1208 cmn_err(CE_NOTE, 1209 "System detected %d cpus, but " 1210 "only %d cpu(s) were enabled during boot.", 1211 skipped + 1, ncpus); 1212 cmn_err(CE_NOTE, 1213 "Use \"boot-ncpus\" parameter to enable more CPU(s). " 1214 "See eeprom(1M)."); 1215 } 1216 1217 done: 1218 workaround_errata_end(); 1219 mach_cpucontext_fini(); 1220 1221 cmi_post_mpstartup(); 1222 } 1223 1224 /* 1225 * Dummy functions - no i86pc platforms support dynamic cpu allocation. 1226 */ 1227 /*ARGSUSED*/ 1228 int 1229 mp_cpu_configure(int cpuid) 1230 { 1231 return (ENOTSUP); /* not supported */ 1232 } 1233 1234 /*ARGSUSED*/ 1235 int 1236 mp_cpu_unconfigure(int cpuid) 1237 { 1238 return (ENOTSUP); /* not supported */ 1239 } 1240 1241 /* 1242 * Startup function for 'other' CPUs (besides boot cpu). 1243 * Called from real_mode_start. 1244 * 1245 * WARNING: until CPU_READY is set, mp_startup and routines called by 1246 * mp_startup should not call routines (e.g. kmem_free) that could call 1247 * hat_unload which requires CPU_READY to be set. 1248 */ 1249 void 1250 mp_startup(void) 1251 { 1252 struct cpu *cp = CPU; 1253 uint_t new_x86_feature; 1254 1255 /* 1256 * We need to get TSC on this proc synced (i.e., any delta 1257 * from cpu0 accounted for) as soon as we can, because many 1258 * many things use gethrtime/pc_gethrestime, including 1259 * interrupts, cmn_err, etc. 1260 */ 1261 1262 /* Let cpu0 continue into tsc_sync_master() */ 1263 CPUSET_ATOMIC_ADD(procset, cp->cpu_id); 1264 1265 if (tsc_gethrtime_enable) 1266 tsc_sync_slave(); 1267 1268 /* 1269 * Once this was done from assembly, but it's safer here; if 1270 * it blocks, we need to be able to swtch() to and from, and 1271 * since we get here by calling t_pc, we need to do that call 1272 * before swtch() overwrites it. 1273 */ 1274 1275 (void) (*ap_mlsetup)(); 1276 1277 new_x86_feature = cpuid_pass1(cp); 1278 1279 /* 1280 * We need to Sync MTRR with cpu0's MTRR. We have to do 1281 * this with interrupts disabled. 1282 */ 1283 if (x86_feature & X86_MTRR) 1284 mtrr_sync(); 1285 1286 /* 1287 * Set up TSC_AUX to contain the cpuid for this processor 1288 * for the rdtscp instruction. 1289 */ 1290 if (x86_feature & X86_TSCP) 1291 (void) wrmsr(MSR_AMD_TSCAUX, cp->cpu_id); 1292 1293 /* 1294 * Initialize this CPU's syscall handlers 1295 */ 1296 init_cpu_syscall(cp); 1297 1298 /* 1299 * Enable interrupts with spl set to LOCK_LEVEL. LOCK_LEVEL is the 1300 * highest level at which a routine is permitted to block on 1301 * an adaptive mutex (allows for cpu poke interrupt in case 1302 * the cpu is blocked on a mutex and halts). Setting LOCK_LEVEL blocks 1303 * device interrupts that may end up in the hat layer issuing cross 1304 * calls before CPU_READY is set. 1305 */ 1306 splx(ipltospl(LOCK_LEVEL)); 1307 sti(); 1308 1309 /* 1310 * Do a sanity check to make sure this new CPU is a sane thing 1311 * to add to the collection of processors running this system. 1312 * 1313 * XXX Clearly this needs to get more sophisticated, if x86 1314 * systems start to get built out of heterogenous CPUs; as is 1315 * likely to happen once the number of processors in a configuration 1316 * gets large enough. 1317 */ 1318 if ((x86_feature & new_x86_feature) != x86_feature) { 1319 cmn_err(CE_CONT, "?cpu%d: %b\n", 1320 cp->cpu_id, new_x86_feature, FMT_X86_FEATURE); 1321 cmn_err(CE_WARN, "cpu%d feature mismatch", cp->cpu_id); 1322 } 1323 1324 /* 1325 * We do not support cpus with mixed monitor/mwait support if the 1326 * boot cpu supports monitor/mwait. 1327 */ 1328 if ((x86_feature & ~new_x86_feature) & X86_MWAIT) 1329 panic("unsupported mixed cpu monitor/mwait support detected"); 1330 1331 /* 1332 * We could be more sophisticated here, and just mark the CPU 1333 * as "faulted" but at this point we'll opt for the easier 1334 * answer of dieing horribly. Provided the boot cpu is ok, 1335 * the system can be recovered by booting with use_mp set to zero. 1336 */ 1337 if (workaround_errata(cp) != 0) 1338 panic("critical workaround(s) missing for cpu%d", cp->cpu_id); 1339 1340 cpuid_pass2(cp); 1341 cpuid_pass3(cp); 1342 (void) cpuid_pass4(cp); 1343 1344 init_cpu_info(cp); 1345 1346 mutex_enter(&cpu_lock); 1347 /* 1348 * Processor group initialization for this CPU is dependent on the 1349 * cpuid probing, which must be done in the context of the current 1350 * CPU. 1351 */ 1352 pghw_physid_create(cp); 1353 pg_cpu_init(cp); 1354 pg_cmt_cpu_startup(cp); 1355 1356 cp->cpu_flags |= CPU_RUNNING | CPU_READY | CPU_ENABLE | CPU_EXISTS; 1357 cpu_add_active(cp); 1358 1359 if (dtrace_cpu_init != NULL) { 1360 (*dtrace_cpu_init)(cp->cpu_id); 1361 } 1362 1363 /* 1364 * Fill out cpu_ucode_info. Update microcode if necessary. 1365 */ 1366 ucode_check(cp); 1367 1368 mutex_exit(&cpu_lock); 1369 1370 /* 1371 * Enable preemption here so that contention for any locks acquired 1372 * later in mp_startup may be preempted if the thread owning those 1373 * locks is continously executing on other CPUs (for example, this 1374 * CPU must be preemptible to allow other CPUs to pause it during their 1375 * startup phases). It's safe to enable preemption here because the 1376 * CPU state is pretty-much fully constructed. 1377 */ 1378 curthread->t_preempt = 0; 1379 1380 add_cpunode2devtree(cp->cpu_id, cp->cpu_m.mcpu_cpi); 1381 1382 /* The base spl should still be at LOCK LEVEL here */ 1383 ASSERT(cp->cpu_base_spl == ipltospl(LOCK_LEVEL)); 1384 set_base_spl(); /* Restore the spl to its proper value */ 1385 1386 (void) spl0(); /* enable interrupts */ 1387 1388 /* 1389 * Set up the CPU module for this CPU. This can't be done before 1390 * this CPU is made CPU_READY, because we may (in heterogeneous systems) 1391 * need to go load another CPU module. The act of attempting to load 1392 * a module may trigger a cross-call, which will ASSERT unless this 1393 * cpu is CPU_READY. 1394 */ 1395 cmi_init(); 1396 1397 if (x86_feature & X86_MCA) 1398 cmi_mca_init(); 1399 1400 if (boothowto & RB_DEBUG) 1401 kdi_cpu_init(); 1402 1403 /* 1404 * Setting the bit in cpu_ready_set must be the last operation in 1405 * processor initialization; the boot CPU will continue to boot once 1406 * it sees this bit set for all active CPUs. 1407 */ 1408 CPUSET_ATOMIC_ADD(cpu_ready_set, cp->cpu_id); 1409 1410 /* 1411 * Because mp_startup() gets fired off after init() starts, we 1412 * can't use the '?' trick to do 'boot -v' printing - so we 1413 * always direct the 'cpu .. online' messages to the log. 1414 */ 1415 cmn_err(CE_CONT, "!cpu%d initialization complete - online\n", 1416 cp->cpu_id); 1417 1418 /* 1419 * Now we are done with the startup thread, so free it up. 1420 */ 1421 thread_exit(); 1422 panic("mp_startup: cannot return"); 1423 /*NOTREACHED*/ 1424 } 1425 1426 1427 /* 1428 * Start CPU on user request. 1429 */ 1430 /* ARGSUSED */ 1431 int 1432 mp_cpu_start(struct cpu *cp) 1433 { 1434 ASSERT(MUTEX_HELD(&cpu_lock)); 1435 return (0); 1436 } 1437 1438 /* 1439 * Stop CPU on user request. 1440 */ 1441 /* ARGSUSED */ 1442 int 1443 mp_cpu_stop(struct cpu *cp) 1444 { 1445 extern int cbe_psm_timer_mode; 1446 ASSERT(MUTEX_HELD(&cpu_lock)); 1447 1448 /* 1449 * If TIMER_PERIODIC mode is used, CPU0 is the one running it; 1450 * can't stop it. (This is true only for machines with no TSC.) 1451 */ 1452 1453 if ((cbe_psm_timer_mode == TIMER_PERIODIC) && (cp->cpu_id == 0)) 1454 return (1); 1455 1456 return (0); 1457 } 1458 1459 /* 1460 * Take the specified CPU out of participation in interrupts. 1461 */ 1462 int 1463 cpu_disable_intr(struct cpu *cp) 1464 { 1465 if (psm_disable_intr(cp->cpu_id) != DDI_SUCCESS) 1466 return (EBUSY); 1467 1468 cp->cpu_flags &= ~CPU_ENABLE; 1469 return (0); 1470 } 1471 1472 /* 1473 * Allow the specified CPU to participate in interrupts. 1474 */ 1475 void 1476 cpu_enable_intr(struct cpu *cp) 1477 { 1478 ASSERT(MUTEX_HELD(&cpu_lock)); 1479 cp->cpu_flags |= CPU_ENABLE; 1480 psm_enable_intr(cp->cpu_id); 1481 } 1482 1483 1484 1485 void 1486 mp_cpu_faulted_enter(struct cpu *cp) 1487 { 1488 cmi_faulted_enter(cp); 1489 } 1490 1491 void 1492 mp_cpu_faulted_exit(struct cpu *cp) 1493 { 1494 cmi_faulted_exit(cp); 1495 } 1496 1497 /* 1498 * The following two routines are used as context operators on threads belonging 1499 * to processes with a private LDT (see sysi86). Due to the rarity of such 1500 * processes, these routines are currently written for best code readability and 1501 * organization rather than speed. We could avoid checking x86_feature at every 1502 * context switch by installing different context ops, depending on the 1503 * x86_feature flags, at LDT creation time -- one for each combination of fast 1504 * syscall feature flags. 1505 */ 1506 1507 /*ARGSUSED*/ 1508 void 1509 cpu_fast_syscall_disable(void *arg) 1510 { 1511 if ((x86_feature & (X86_MSR | X86_SEP)) == (X86_MSR | X86_SEP)) 1512 cpu_sep_disable(); 1513 if ((x86_feature & (X86_MSR | X86_ASYSC)) == (X86_MSR | X86_ASYSC)) 1514 cpu_asysc_disable(); 1515 } 1516 1517 /*ARGSUSED*/ 1518 void 1519 cpu_fast_syscall_enable(void *arg) 1520 { 1521 if ((x86_feature & (X86_MSR | X86_SEP)) == (X86_MSR | X86_SEP)) 1522 cpu_sep_enable(); 1523 if ((x86_feature & (X86_MSR | X86_ASYSC)) == (X86_MSR | X86_ASYSC)) 1524 cpu_asysc_enable(); 1525 } 1526 1527 static void 1528 cpu_sep_enable(void) 1529 { 1530 ASSERT(x86_feature & X86_SEP); 1531 ASSERT(curthread->t_preempt || getpil() >= LOCK_LEVEL); 1532 1533 wrmsr(MSR_INTC_SEP_CS, (uint64_t)(uintptr_t)KCS_SEL); 1534 } 1535 1536 static void 1537 cpu_sep_disable(void) 1538 { 1539 ASSERT(x86_feature & X86_SEP); 1540 ASSERT(curthread->t_preempt || getpil() >= LOCK_LEVEL); 1541 1542 /* 1543 * Setting the SYSENTER_CS_MSR register to 0 causes software executing 1544 * the sysenter or sysexit instruction to trigger a #gp fault. 1545 */ 1546 wrmsr(MSR_INTC_SEP_CS, 0); 1547 } 1548 1549 static void 1550 cpu_asysc_enable(void) 1551 { 1552 ASSERT(x86_feature & X86_ASYSC); 1553 ASSERT(curthread->t_preempt || getpil() >= LOCK_LEVEL); 1554 1555 wrmsr(MSR_AMD_EFER, rdmsr(MSR_AMD_EFER) | 1556 (uint64_t)(uintptr_t)AMD_EFER_SCE); 1557 } 1558 1559 static void 1560 cpu_asysc_disable(void) 1561 { 1562 ASSERT(x86_feature & X86_ASYSC); 1563 ASSERT(curthread->t_preempt || getpil() >= LOCK_LEVEL); 1564 1565 /* 1566 * Turn off the SCE (syscall enable) bit in the EFER register. Software 1567 * executing syscall or sysret with this bit off will incur a #ud trap. 1568 */ 1569 wrmsr(MSR_AMD_EFER, rdmsr(MSR_AMD_EFER) & 1570 ~((uint64_t)(uintptr_t)AMD_EFER_SCE)); 1571 } 1572