osfmk/kern/startup.c

   1 /*
   2  * Copyright (c) 2000-2010 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * @OSF_COPYRIGHT@
  30  */
  31 /*
  32  * Mach Operating System
  33  * Copyright (c) 1991,1990,1989,1988 Carnegie Mellon University
  34  * All Rights Reserved.
  35  *
  36  * Permission to use, copy, modify and distribute this software and its
  37  * documentation is hereby granted, provided that both the copyright
  38  * notice and this permission notice appear in all copies of the
  39  * software, derivative works or modified versions, and any portions
  40  * thereof, and that both notices appear in supporting documentation.
  41  *
  42  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  43  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  44  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  45  *
  46  * Carnegie Mellon requests users of this software to return to
  47  *
  48  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  49  *  School of Computer Science
  50  *  Carnegie Mellon University
  51  *  Pittsburgh PA 15213-3890
  52  *
  53  * any improvements or extensions that they make and grant Carnegie Mellon
  54  * the rights to redistribute these changes.
  55  */
  56 /*
  57  * NOTICE: This file was modified by McAfee Research in 2004 to introduce
  58  * support for mandatory and extensible security protections.  This notice
  59  * is included in support of clause 2.2 (b) of the Apple Public License,
  60  * Version 2.0.
  61  */
  62 /*
  63  */
  64
  65 /*
  66  *      Mach kernel startup.
  67  */
  68
  69 #include <debug.h>
  70 #include <xpr_debug.h>
  71 #include <mach_kdp.h>
  72
  73 #include <mach/boolean.h>
  74 #include <mach/machine.h>
  75 #include <mach/thread_act.h>
  76 #include <mach/task_special_ports.h>
  77 #include <mach/vm_param.h>
  78 #include <ipc/ipc_init.h>
  79 #include <kern/assert.h>
  80 #include <kern/mach_param.h>
  81 #include <kern/misc_protos.h>
  82 #include <kern/clock.h>
  83 #include <kern/coalition.h>
  84 #include <kern/cpu_number.h>
  85 #include <kern/ledger.h>
  86 #include <kern/machine.h>
  87 #include <kern/processor.h>
  88 #include <kern/sched_prim.h>
  89 #if CONFIG_SCHED_SFI
  90 #include <kern/sfi.h>
  91 #endif
  92 #include <kern/startup.h>
  93 #include <kern/task.h>
  94 #include <kern/thread.h>
  95 #include <kern/timer.h>
  96 #if CONFIG_TELEMETRY
  97 #include <kern/telemetry.h>
  98 #endif
  99 #include <kern/xpr.h>
 100 #include <kern/zalloc.h>
 101 #include <kern/locks.h>
 102 #include <kern/debug.h>
 103 #include <corpses/task_corpse.h>
 104 #include <prng/random.h>
 105 #include <console/serial_protos.h>
 106 #include <vm/vm_kern.h>
 107 #include <vm/vm_init.h>
 108 #include <vm/vm_map.h>
 109 #include <vm/vm_object.h>
 110 #include <vm/vm_page.h>
 111 #include <vm/vm_pageout.h>
 112 #include <vm/vm_shared_region.h>
 113 #include <machine/pmap.h>
 114 #include <machine/commpage.h>
 115 #include <libkern/version.h>
 116 #include <sys/codesign.h>
 117 #include <sys/kdebug.h>
 118 #include <sys/random.h>
 119 #include <sys/ktrace.h>
 120
 121 #include <kern/ltable.h>
 122 #include <kern/waitq.h>
 123 #include <ipc/ipc_voucher.h>
 124 #include <voucher/ipc_pthread_priority_internal.h>
 125 #include <mach/host_info.h>
 126
 127
 128 #if CONFIG_ATM
 129 #include <atm/atm_internal.h>
 130 #endif
 131
 132 #if CONFIG_CSR
 133 #include <sys/csr.h>
 134 #endif
 135
 136 #include <bank/bank_internal.h>
 137
 138 #if ALTERNATE_DEBUGGER
 139 #include <arm64/alternate_debugger.h>
 140 #endif
 141
 142 #if MACH_KDP
 143 #include <kdp/kdp.h>
 144 #endif
 145
 146 #if CONFIG_MACF
 147 #include <security/mac_mach_internal.h>
 148 #if CONFIG_VNGUARD
 149 extern void vnguard_policy_init(void);
 150 #endif
 151 #endif
 152
 153 #if KPC
 154 #include <kern/kpc.h>
 155 #endif
 156
 157 #if HYPERVISOR
 158 #include <kern/hv_support.h>
 159 #endif
 160
 161 #include <san/kasan.h>
 162
 163 #if defined(__arm__) || defined(__arm64__)
 164 #include <arm/misc_protos.h> // for arm_vm_prot_finalize
 165 #endif
 166
 167 #include <i386/pmCPU.h>
 168 static void             kernel_bootstrap_thread(void);
 169
 170 static void             load_context(
 171                                         thread_t        thread);
 172 #if (defined(__i386__) || defined(__x86_64__)) && NCOPY_WINDOWS > 0
 173 extern void cpu_userwindow_init(int);
 174 extern void cpu_physwindow_init(int);
 175 #endif
 176
 177 #if CONFIG_ECC_LOGGING
 178 #include <kern/ecc.h>
 179 #endif
 180
 181 #if (defined(__i386__) || defined(__x86_64__)) && CONFIG_VMX
 182 #include <i386/vmx/vmx_cpu.h>
 183 #endif
 184
 185 // libkern/OSKextLib.cpp
 186 extern void     OSKextRemoveKextBootstrap(void);
 187
 188 void scale_setup(void);
 189 extern void bsd_scale_setup(int);
 190 extern unsigned int semaphore_max;
 191 extern void stackshot_init(void);
 192 extern void ktrace_init(void);
 193 extern void oslog_init(void);
 194
 195 /*
 196  *      Running in virtual memory, on the interrupt stack.
 197  */
 198
 199 extern int serverperfmode;
 200
 201 /* size of kernel trace buffer, disabled by default */
 202 unsigned int new_nkdbufs = 0;
 203 unsigned int wake_nkdbufs = 0;
 204 unsigned int write_trace_on_panic = 0;
 205 static char trace_typefilter[64] = { 0 };
 206 boolean_t trace_serial = FALSE;
 207 boolean_t early_boot_complete = FALSE;
 208
 209 /* mach leak logging */
 210 int log_leaks = 0;
 211
 212 static inline void
 213 kernel_bootstrap_log(const char *message)
 214 {
 215 //      kprintf("kernel_bootstrap: %s\n", message);
 216         kernel_debug_string_early(message);
 217 }
 218
 219 static inline void
 220 kernel_bootstrap_thread_log(const char *message)
 221 {
 222 //      kprintf("kernel_bootstrap_thread: %s\n", message);
 223         kernel_debug_string_early(message);
 224 }
 225
 226 void
 227 kernel_early_bootstrap(void)
 228 {
 229         /* serverperfmode is needed by timer setup */
 230         if (PE_parse_boot_argn("serverperfmode", &serverperfmode, sizeof (serverperfmode))) {
 231                 serverperfmode = 1;
 232         }
 233
 234         lck_mod_init();
 235
 236         /*
 237          * Initialize the timer callout world
 238          */
 239         timer_call_init();
 240
 241 #if CONFIG_SCHED_SFI
 242         /*
 243          * Configure SFI classes
 244          */
 245         sfi_early_init();
 246 #endif
 247 }
 248
 249 extern boolean_t IORamDiskBSDRoot(void);
 250 extern kern_return_t cpm_preallocate_early(void);
 251
 252 void
 253 kernel_bootstrap(void)
 254 {
 255         kern_return_t   result;
 256         thread_t        thread;
 257         char            namep[16];
 258
 259         printf("%s\n", version); /* log kernel version */
 260
 261         if (PE_parse_boot_argn("-l", namep, sizeof (namep))) /* leaks logging */
 262                 log_leaks = 1;
 263
 264         PE_parse_boot_argn("trace", &new_nkdbufs, sizeof (new_nkdbufs));
 265         PE_parse_boot_argn("trace_wake", &wake_nkdbufs, sizeof (wake_nkdbufs));
 266         PE_parse_boot_argn("trace_panic", &write_trace_on_panic, sizeof(write_trace_on_panic));
 267         PE_parse_boot_arg_str("trace_typefilter", trace_typefilter, sizeof(trace_typefilter));
 268
 269         scale_setup();
 270
 271         kernel_bootstrap_log("vm_mem_bootstrap");
 272         vm_mem_bootstrap();
 273
 274         kernel_bootstrap_log("cs_init");
 275         cs_init();
 276
 277         kernel_bootstrap_log("vm_mem_init");
 278         vm_mem_init();
 279
 280         machine_info.memory_size = (uint32_t)mem_size;
 281         machine_info.max_mem = max_mem;
 282         machine_info.major_version = version_major;
 283         machine_info.minor_version = version_minor;
 284
 285         oslog_init();
 286
 287 #if KASAN
 288         kernel_bootstrap_log("kasan_late_init");
 289         kasan_late_init();
 290 #endif
 291
 292 #if CONFIG_TELEMETRY
 293         kernel_bootstrap_log("telemetry_init");
 294         telemetry_init();
 295 #endif
 296
 297 #if CONFIG_CSR
 298         kernel_bootstrap_log("csr_init");
 299         csr_init();
 300 #endif
 301
 302         if (PE_i_can_has_debugger(NULL) &&
 303             PE_parse_boot_argn("-show_pointers", &namep, sizeof (namep))) {
 304                 doprnt_hide_pointers = FALSE;
 305         }
 306
 307         kernel_bootstrap_log("console_init");
 308         console_init();
 309
 310         kernel_bootstrap_log("stackshot_init");
 311         stackshot_init();
 312
 313         kernel_bootstrap_log("sched_init");
 314         sched_init();
 315
 316         kernel_bootstrap_log("ltable_bootstrap");
 317         ltable_bootstrap();
 318
 319         kernel_bootstrap_log("waitq_bootstrap");
 320         waitq_bootstrap();
 321
 322         kernel_bootstrap_log("ipc_bootstrap");
 323         ipc_bootstrap();
 324
 325 #if CONFIG_MACF
 326         kernel_bootstrap_log("mac_policy_init");
 327         mac_policy_init();
 328 #endif
 329
 330         kernel_bootstrap_log("ipc_init");
 331         ipc_init();
 332
 333         /*
 334          * As soon as the virtual memory system is up, we record
 335          * that this CPU is using the kernel pmap.
 336          */
 337         kernel_bootstrap_log("PMAP_ACTIVATE_KERNEL");
 338         PMAP_ACTIVATE_KERNEL(master_cpu);
 339
 340         kernel_bootstrap_log("mapping_free_prime");
 341         mapping_free_prime();                                           /* Load up with temporary mapping blocks */
 342
 343         kernel_bootstrap_log("machine_init");
 344         machine_init();
 345
 346         kernel_bootstrap_log("clock_init");
 347         clock_init();
 348
 349         ledger_init();
 350
 351         /*
 352          *      Initialize the IPC, task, and thread subsystems.
 353          */
 354
 355 #if CONFIG_COALITIONS
 356         kernel_bootstrap_log("coalitions_init");
 357         coalitions_init();
 358 #endif
 359
 360         kernel_bootstrap_log("task_init");
 361         task_init();
 362
 363         kernel_bootstrap_log("thread_init");
 364         thread_init();
 365
 366 #if CONFIG_ATM
 367         /* Initialize the Activity Trace Resource Manager. */
 368         kernel_bootstrap_log("atm_init");
 369         atm_init();
 370 #endif
 371         kernel_bootstrap_log("mach_init_activity_id");
 372         mach_init_activity_id();
 373
 374         /* Initialize the BANK Manager. */
 375         kernel_bootstrap_log("bank_init");
 376         bank_init();
 377
 378         kernel_bootstrap_log("ipc_pthread_priority_init");
 379         ipc_pthread_priority_init();
 380
 381         /* initialize the corpse config based on boot-args */
 382         corpses_init();
 383
 384         /* initialize host_statistics */
 385         host_statistics_init();
 386
 387         /*
 388          *      Create a kernel thread to execute the kernel bootstrap.
 389          */
 390         kernel_bootstrap_log("kernel_thread_create");
 391         result = kernel_thread_create((thread_continue_t)kernel_bootstrap_thread, NULL, MAXPRI_KERNEL, &thread);
 392
 393         if (result != KERN_SUCCESS) panic("kernel_bootstrap: result = %08X\n", result);
 394
 395         thread->state = TH_RUN;
 396         thread->last_made_runnable_time = mach_absolute_time();
 397         thread_deallocate(thread);
 398
 399         kernel_bootstrap_log("load_context - done");
 400         load_context(thread);
 401         /*NOTREACHED*/
 402 }
 403
 404 int kth_started = 0;
 405
 406 vm_offset_t vm_kernel_addrperm;
 407 vm_offset_t buf_kernel_addrperm;
 408 vm_offset_t vm_kernel_addrperm_ext;
 409 uint64_t vm_kernel_addrhash_salt;
 410 uint64_t vm_kernel_addrhash_salt_ext;
 411
 412 /*
 413  * Now running in a thread.  Kick off other services,
 414  * invoke user bootstrap, enter pageout loop.
 415  */
 416 static void
 417 kernel_bootstrap_thread(void)
 418 {
 419         processor_t             processor = current_processor();
 420
 421 #define kernel_bootstrap_thread_kprintf(x...) /* kprintf("kernel_bootstrap_thread: " x) */
 422         kernel_bootstrap_thread_log("idle_thread_create");
 423         /*
 424          * Create the idle processor thread.
 425          */
 426         idle_thread_create(processor);
 427
 428         /*
 429          * N.B. Do not stick anything else
 430          * before this point.
 431          *
 432          * Start up the scheduler services.
 433          */
 434         kernel_bootstrap_thread_log("sched_startup");
 435         sched_startup();
 436
 437         /*
 438          * Thread lifecycle maintenance (teardown, stack allocation)
 439          */
 440         kernel_bootstrap_thread_log("thread_daemon_init");
 441         thread_daemon_init();
 442
 443         /* Create kernel map entry reserve */
 444         vm_kernel_reserved_entry_init();
 445
 446         /*
 447          * Thread callout service.
 448          */
 449         kernel_bootstrap_thread_log("thread_call_initialize");
 450         thread_call_initialize();
 451
 452         /*
 453          * Remain on current processor as
 454          * additional processors come online.
 455          */
 456         kernel_bootstrap_thread_log("thread_bind");
 457         thread_bind(processor);
 458
 459 #if __arm64__
 460         if (IORamDiskBSDRoot()) {
 461                 cpm_preallocate_early();
 462         }
 463 #endif /* __arm64__ */
 464
 465         /*
 466          * Initialize ipc thread call support.
 467          */
 468         kernel_bootstrap_thread_log("ipc_thread_call_init");
 469         ipc_thread_call_init();
 470
 471         /*
 472          * Kick off memory mapping adjustments.
 473          */
 474         kernel_bootstrap_thread_log("mapping_adjust");
 475         mapping_adjust();
 476
 477         /*
 478          *      Create the clock service.
 479          */
 480         kernel_bootstrap_thread_log("clock_service_create");
 481         clock_service_create();
 482
 483         /*
 484          *      Create the device service.
 485          */
 486         device_service_create();
 487
 488         kth_started = 1;
 489
 490 #if (defined(__i386__) || defined(__x86_64__)) && NCOPY_WINDOWS > 0
 491         /*
 492          * Create and initialize the physical copy window for processor 0
 493          * This is required before starting kicking off  IOKit.
 494          */
 495         cpu_physwindow_init(0);
 496 #endif
 497
 498
 499
 500 #if MACH_KDP
 501         kernel_bootstrap_log("kdp_init");
 502         kdp_init();
 503 #endif
 504
 505 #if ALTERNATE_DEBUGGER
 506         alternate_debugger_init();
 507 #endif
 508
 509 #if KPC
 510         kpc_init();
 511 #endif
 512
 513 #if CONFIG_ECC_LOGGING
 514         ecc_log_init();
 515 #endif
 516
 517 #if HYPERVISOR
 518         hv_support_init();
 519 #endif
 520
 521 #if CONFIG_TELEMETRY
 522         kernel_bootstrap_log("bootprofile_init");
 523         bootprofile_init();
 524 #endif
 525
 526 #if (defined(__i386__) || defined(__x86_64__)) && CONFIG_VMX
 527         vmx_init();
 528 #endif
 529
 530         kernel_bootstrap_thread_log("ktrace_init");
 531         ktrace_init();
 532
 533         kdebug_init(new_nkdbufs, trace_typefilter);
 534
 535         kernel_bootstrap_log("prng_init");
 536         prng_cpu_init(master_cpu);
 537
 538 #ifdef  MACH_BSD
 539         kernel_bootstrap_log("bsd_early_init");
 540         bsd_early_init();
 541 #endif
 542
 543 #if defined(__arm64__)
 544     ml_lockdown_init();
 545 #endif
 546
 547 #ifdef  IOKIT
 548         kernel_bootstrap_log("PE_init_iokit");
 549         PE_init_iokit();
 550 #endif
 551
 552         assert(ml_get_interrupts_enabled() == FALSE);
 553
 554         /*
 555          * Past this point, kernel subsystems that expect to operate with
 556          * interrupts or preemption enabled may begin enforcement.
 557          */
 558         early_boot_complete = TRUE;
 559
 560 #if INTERRUPT_MASKED_DEBUG
 561         // Reset interrupts masked timeout before we enable interrupts
 562         ml_spin_debug_clear_self();
 563 #endif
 564         (void) spllo();         /* Allow interruptions */
 565
 566 #if (defined(__i386__) || defined(__x86_64__)) && NCOPY_WINDOWS > 0
 567         /*
 568          * Create and initialize the copy window for processor 0
 569          * This also allocates window space for all other processors.
 570          * However, this is dependent on the number of processors - so this call
 571          * must be after IOKit has been started because IOKit performs processor
 572          * discovery.
 573          */
 574         cpu_userwindow_init(0);
 575 #endif
 576
 577         /*
 578          *      Initialize the shared region module.
 579          */
 580         vm_shared_region_init();
 581         vm_commpage_init();
 582         vm_commpage_text_init();
 583
 584 #if CONFIG_MACF
 585         kernel_bootstrap_log("mac_policy_initmach");
 586         mac_policy_initmach();
 587 #if CONFIG_VNGUARD
 588         vnguard_policy_init();
 589 #endif
 590 #endif
 591
 592 #if defined(__arm__) || defined(__arm64__)
 593 #if CONFIG_KERNEL_INTEGRITY
 594         machine_lockdown_preflight();
 595 #endif
 596         /*
 597          *  Finalize protections on statically mapped pages now that comm page mapping is established.
 598          */
 599         arm_vm_prot_finalize(PE_state.bootArgs);
 600 #endif
 601
 602 #if CONFIG_SCHED_SFI
 603         kernel_bootstrap_log("sfi_init");
 604         sfi_init();
 605 #endif
 606
 607         /*
 608          * Initialize the globals used for permuting kernel
 609          * addresses that may be exported to userland as tokens
 610          * using VM_KERNEL_ADDRPERM()/VM_KERNEL_ADDRPERM_EXTERNAL().
 611          * Force the random number to be odd to avoid mapping a non-zero
 612          * word-aligned address to zero via addition.
 613          * Note: at this stage we can use the cryptographically secure PRNG
 614          * rather than early_random().
 615          */
 616         read_random(&vm_kernel_addrperm, sizeof(vm_kernel_addrperm));
 617         vm_kernel_addrperm |= 1;
 618         read_random(&buf_kernel_addrperm, sizeof(buf_kernel_addrperm));
 619         buf_kernel_addrperm |= 1;
 620         read_random(&vm_kernel_addrperm_ext, sizeof(vm_kernel_addrperm_ext));
 621         vm_kernel_addrperm_ext |= 1;
 622         read_random(&vm_kernel_addrhash_salt, sizeof(vm_kernel_addrhash_salt));
 623         read_random(&vm_kernel_addrhash_salt_ext, sizeof(vm_kernel_addrhash_salt_ext));
 624
 625         vm_set_restrictions();
 626
 627
 628
 629         /*
 630          *      Start the user bootstrap.
 631          */
 632 #ifdef  MACH_BSD
 633         bsd_init();
 634 #endif
 635
 636     /*
 637      * Get rid of segments used to bootstrap kext loading. This removes
 638      * the KLD, PRELINK symtab, LINKEDIT, and symtab segments/load commands.
 639      */
 640         OSKextRemoveKextBootstrap();
 641
 642         /*
 643          * Get rid of pages used for early boot tracing.
 644          */
 645         kdebug_free_early_buf();
 646
 647         serial_keyboard_init();         /* Start serial keyboard if wanted */
 648
 649         vm_page_init_local_q();
 650
 651         thread_bind(PROCESSOR_NULL);
 652
 653         /*
 654          *      Become the pageout daemon.
 655          */
 656         vm_pageout();
 657         /*NOTREACHED*/
 658 }
 659
 660 /*
 661  *      slave_main:
 662  *
 663  *      Load the first thread to start a processor.
 664  */
 665 void
 666 slave_main(void *machine_param)
 667 {
 668         processor_t             processor = current_processor();
 669         thread_t                thread;
 670
 671         /*
 672          *      Use the idle processor thread if there
 673          *      is no dedicated start up thread.
 674          */
 675         if (processor->next_thread == THREAD_NULL) {
 676                 thread = processor->idle_thread;
 677                 thread->continuation = (thread_continue_t)processor_start_thread;
 678                 thread->parameter = machine_param;
 679         }
 680         else {
 681                 thread = processor->next_thread;
 682                 processor->next_thread = THREAD_NULL;
 683         }
 684
 685         load_context(thread);
 686         /*NOTREACHED*/
 687 }
 688
 689 /*
 690  *      processor_start_thread:
 691  *
 692  *      First thread to execute on a started processor.
 693  *
 694  *      Called at splsched.
 695  */
 696 void
 697 processor_start_thread(void *machine_param)
 698 {
 699         processor_t             processor = current_processor();
 700         thread_t                self = current_thread();
 701
 702         slave_machine_init(machine_param);
 703
 704         /*
 705          *      If running the idle processor thread,
 706          *      reenter the idle loop, else terminate.
 707          */
 708         if (self == processor->idle_thread)
 709                 thread_block((thread_continue_t)idle_thread);
 710
 711         thread_terminate(self);
 712         /*NOTREACHED*/
 713 }
 714
 715 /*
 716  *      load_context:
 717  *
 718  *      Start the first thread on a processor.
 719  */
 720 static void __attribute__((noreturn))
 721 load_context(
 722         thread_t                thread)
 723 {
 724         processor_t             processor = current_processor();
 725
 726
 727 #define load_context_kprintf(x...) /* kprintf("load_context: " x) */
 728
 729         load_context_kprintf("machine_set_current_thread\n");
 730         machine_set_current_thread(thread);
 731
 732         load_context_kprintf("processor_up\n");
 733         processor_up(processor);
 734
 735         PMAP_ACTIVATE_KERNEL(processor->cpu_id);
 736
 737         /*
 738          * Acquire a stack if none attached.  The panic
 739          * should never occur since the thread is expected
 740          * to have reserved stack.
 741          */
 742         load_context_kprintf("thread %p, stack %lx, stackptr %lx\n", thread,
 743                              thread->kernel_stack, thread->machine.kstackptr);
 744         if (!thread->kernel_stack) {
 745                 load_context_kprintf("stack_alloc_try\n");
 746                 if (!stack_alloc_try(thread))
 747                         panic("load_context");
 748         }
 749
 750         /*
 751          * The idle processor threads are not counted as
 752          * running for load calculations.
 753          */
 754         if (!(thread->state & TH_IDLE))
 755                 sched_run_incr(thread);
 756
 757         processor->active_thread = thread;
 758         processor_state_update_explicit(processor, thread->sched_pri,
 759                 SFI_CLASS_KERNEL, PSET_SMP, thread_get_perfcontrol_class(thread));
 760         processor->starting_pri = thread->sched_pri;
 761         processor->deadline = UINT64_MAX;
 762         thread->last_processor = processor;
 763
 764         processor->last_dispatch = mach_absolute_time();
 765         timer_start(&thread->system_timer, processor->last_dispatch);
 766         PROCESSOR_DATA(processor, thread_timer) = PROCESSOR_DATA(processor, kernel_timer) = &thread->system_timer;
 767
 768         timer_start(&PROCESSOR_DATA(processor, system_state), processor->last_dispatch);
 769         PROCESSOR_DATA(processor, current_state) = &PROCESSOR_DATA(processor, system_state);
 770
 771
 772         PMAP_ACTIVATE_USER(thread, processor->cpu_id);
 773
 774         load_context_kprintf("machine_load_context\n");
 775         machine_load_context(thread);
 776         /*NOTREACHED*/
 777 }
 778
 779 void
 780 scale_setup()
 781 {
 782         int scale = 0;
 783 #if defined(__LP64__)
 784         typeof(task_max) task_max_base = task_max;
 785
 786         /* Raise limits for servers with >= 16G */
 787         if ((serverperfmode != 0) && ((uint64_t)sane_size >= (uint64_t)(16 * 1024 * 1024 *1024ULL))) {
 788                 scale = (int)((uint64_t)sane_size / (uint64_t)(8 * 1024 * 1024 *1024ULL));
 789                 /* limit to 128 G */
 790                 if (scale > 16)
 791                         scale = 16;
 792                 task_max_base = 2500;
 793         /* Raise limits for machines with >= 3GB */
 794         } else if ((uint64_t)sane_size >= (uint64_t)(3 * 1024 * 1024 *1024ULL)) {
 795                 if ((uint64_t)sane_size < (uint64_t)(8 * 1024 * 1024 *1024ULL)) {
 796                         scale = 2;
 797                 } else {
 798                         /* limit to 64GB */
 799                         scale = MIN(16, (int)((uint64_t)sane_size / (uint64_t)(4 * 1024 * 1024 *1024ULL)));
 800                 }
 801         }
 802
 803         task_max = MAX(task_max, task_max_base * scale);
 804
 805         if (scale != 0) {
 806                 task_threadmax = task_max;
 807                 thread_max = task_max * 5;
 808         }
 809
 810 #endif
 811
 812         bsd_scale_setup(scale);
 813
 814         ipc_space_max = SPACE_MAX;
 815         ipc_port_max = PORT_MAX;
 816         ipc_pset_max = SET_MAX;
 817         semaphore_max = SEMAPHORE_MAX;
 818 }
 819