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 unsigned int trace_wrap = 0;
 207 boolean_t trace_serial = FALSE;
 208 boolean_t early_boot_complete = FALSE;
 209
 210 /* mach leak logging */
 211 int log_leaks = 0;
 212
 213 static inline void
 214 kernel_bootstrap_log(const char *message)
 215 {
 216 //      kprintf("kernel_bootstrap: %s\n", message);
 217         kernel_debug_string_early(message);
 218 }
 219
 220 static inline void
 221 kernel_bootstrap_thread_log(const char *message)
 222 {
 223 //      kprintf("kernel_bootstrap_thread: %s\n", message);
 224         kernel_debug_string_early(message);
 225 }
 226
 227 void
 228 kernel_early_bootstrap(void)
 229 {
 230         /* serverperfmode is needed by timer setup */
 231         if (PE_parse_boot_argn("serverperfmode", &serverperfmode, sizeof (serverperfmode))) {
 232                 serverperfmode = 1;
 233         }
 234
 235         lck_mod_init();
 236
 237         /*
 238          * Initialize the timer callout world
 239          */
 240         timer_call_init();
 241
 242 #if CONFIG_SCHED_SFI
 243         /*
 244          * Configure SFI classes
 245          */
 246         sfi_early_init();
 247 #endif
 248 }
 249
 250 extern boolean_t IORamDiskBSDRoot(void);
 251 extern kern_return_t cpm_preallocate_early(void);
 252
 253 void
 254 kernel_bootstrap(void)
 255 {
 256         kern_return_t   result;
 257         thread_t        thread;
 258         char            namep[16];
 259
 260         printf("%s\n", version); /* log kernel version */
 261
 262         if (PE_parse_boot_argn("-l", namep, sizeof (namep))) /* leaks logging */
 263                 log_leaks = 1;
 264
 265         PE_parse_boot_argn("trace", &new_nkdbufs, sizeof (new_nkdbufs));
 266         PE_parse_boot_argn("trace_wake", &wake_nkdbufs, sizeof (wake_nkdbufs));
 267         PE_parse_boot_argn("trace_panic", &write_trace_on_panic, sizeof(write_trace_on_panic));
 268         PE_parse_boot_arg_str("trace_typefilter", trace_typefilter, sizeof(trace_typefilter));
 269         PE_parse_boot_argn("trace_wrap", &trace_wrap, sizeof(trace_wrap));
 270
 271         scale_setup();
 272
 273         kernel_bootstrap_log("vm_mem_bootstrap");
 274         vm_mem_bootstrap();
 275
 276         kernel_bootstrap_log("cs_init");
 277         cs_init();
 278
 279         kernel_bootstrap_log("vm_mem_init");
 280         vm_mem_init();
 281
 282         machine_info.memory_size = (uint32_t)mem_size;
 283         machine_info.max_mem = max_mem;
 284         machine_info.major_version = version_major;
 285         machine_info.minor_version = version_minor;
 286
 287         oslog_init();
 288
 289 #if KASAN
 290         kernel_bootstrap_log("kasan_late_init");
 291         kasan_late_init();
 292 #endif
 293
 294 #if CONFIG_TELEMETRY
 295         kernel_bootstrap_log("telemetry_init");
 296         telemetry_init();
 297 #endif
 298
 299 #if CONFIG_CSR
 300         kernel_bootstrap_log("csr_init");
 301         csr_init();
 302 #endif
 303
 304         if (PE_i_can_has_debugger(NULL) &&
 305             PE_parse_boot_argn("-show_pointers", &namep, sizeof (namep))) {
 306                 doprnt_hide_pointers = FALSE;
 307         }
 308
 309         kernel_bootstrap_log("console_init");
 310         console_init();
 311
 312         kernel_bootstrap_log("stackshot_init");
 313         stackshot_init();
 314
 315         kernel_bootstrap_log("sched_init");
 316         sched_init();
 317
 318         kernel_bootstrap_log("ltable_bootstrap");
 319         ltable_bootstrap();
 320
 321         kernel_bootstrap_log("waitq_bootstrap");
 322         waitq_bootstrap();
 323
 324         kernel_bootstrap_log("ipc_bootstrap");
 325         ipc_bootstrap();
 326
 327 #if CONFIG_MACF
 328         kernel_bootstrap_log("mac_policy_init");
 329         mac_policy_init();
 330 #endif
 331
 332         kernel_bootstrap_log("ipc_init");
 333         ipc_init();
 334
 335         /*
 336          * As soon as the virtual memory system is up, we record
 337          * that this CPU is using the kernel pmap.
 338          */
 339         kernel_bootstrap_log("PMAP_ACTIVATE_KERNEL");
 340         PMAP_ACTIVATE_KERNEL(master_cpu);
 341
 342         kernel_bootstrap_log("mapping_free_prime");
 343         mapping_free_prime();                                           /* Load up with temporary mapping blocks */
 344
 345         kernel_bootstrap_log("machine_init");
 346         machine_init();
 347
 348         kernel_bootstrap_log("clock_init");
 349         clock_init();
 350
 351         ledger_init();
 352
 353         /*
 354          *      Initialize the IPC, task, and thread subsystems.
 355          */
 356
 357 #if CONFIG_COALITIONS
 358         kernel_bootstrap_log("coalitions_init");
 359         coalitions_init();
 360 #endif
 361
 362         kernel_bootstrap_log("task_init");
 363         task_init();
 364
 365         kernel_bootstrap_log("thread_init");
 366         thread_init();
 367
 368 #if CONFIG_ATM
 369         /* Initialize the Activity Trace Resource Manager. */
 370         kernel_bootstrap_log("atm_init");
 371         atm_init();
 372 #endif
 373         kernel_bootstrap_log("mach_init_activity_id");
 374         mach_init_activity_id();
 375
 376         /* Initialize the BANK Manager. */
 377         kernel_bootstrap_log("bank_init");
 378         bank_init();
 379
 380         kernel_bootstrap_log("ipc_pthread_priority_init");
 381         ipc_pthread_priority_init();
 382
 383         /* initialize the corpse config based on boot-args */
 384         corpses_init();
 385
 386         /* initialize host_statistics */
 387         host_statistics_init();
 388
 389         /*
 390          *      Create a kernel thread to execute the kernel bootstrap.
 391          */
 392         kernel_bootstrap_log("kernel_thread_create");
 393         result = kernel_thread_create((thread_continue_t)kernel_bootstrap_thread, NULL, MAXPRI_KERNEL, &thread);
 394
 395         if (result != KERN_SUCCESS) panic("kernel_bootstrap: result = %08X\n", result);
 396
 397         thread->state = TH_RUN;
 398         thread->last_made_runnable_time = mach_absolute_time();
 399         thread_deallocate(thread);
 400
 401         kernel_bootstrap_log("load_context - done");
 402         load_context(thread);
 403         /*NOTREACHED*/
 404 }
 405
 406 int kth_started = 0;
 407
 408 vm_offset_t vm_kernel_addrperm;
 409 vm_offset_t buf_kernel_addrperm;
 410 vm_offset_t vm_kernel_addrperm_ext;
 411 uint64_t vm_kernel_addrhash_salt;
 412 uint64_t vm_kernel_addrhash_salt_ext;
 413
 414 /*
 415  * Now running in a thread.  Kick off other services,
 416  * invoke user bootstrap, enter pageout loop.
 417  */
 418 static void
 419 kernel_bootstrap_thread(void)
 420 {
 421         processor_t             processor = current_processor();
 422
 423 #define kernel_bootstrap_thread_kprintf(x...) /* kprintf("kernel_bootstrap_thread: " x) */
 424         kernel_bootstrap_thread_log("idle_thread_create");
 425         /*
 426          * Create the idle processor thread.
 427          */
 428         idle_thread_create(processor);
 429
 430         /*
 431          * N.B. Do not stick anything else
 432          * before this point.
 433          *
 434          * Start up the scheduler services.
 435          */
 436         kernel_bootstrap_thread_log("sched_startup");
 437         sched_startup();
 438
 439         /*
 440          * Thread lifecycle maintenance (teardown, stack allocation)
 441          */
 442         kernel_bootstrap_thread_log("thread_daemon_init");
 443         thread_daemon_init();
 444
 445         /* Create kernel map entry reserve */
 446         vm_kernel_reserved_entry_init();
 447
 448         /*
 449          * Thread callout service.
 450          */
 451         kernel_bootstrap_thread_log("thread_call_initialize");
 452         thread_call_initialize();
 453
 454         /*
 455          * Remain on current processor as
 456          * additional processors come online.
 457          */
 458         kernel_bootstrap_thread_log("thread_bind");
 459         thread_bind(processor);
 460
 461 #if __arm64__
 462         if (IORamDiskBSDRoot()) {
 463                 cpm_preallocate_early();
 464         }
 465 #endif /* __arm64__ */
 466
 467         /*
 468          * Initialize ipc thread call support.
 469          */
 470         kernel_bootstrap_thread_log("ipc_thread_call_init");
 471         ipc_thread_call_init();
 472
 473         /*
 474          * Kick off memory mapping adjustments.
 475          */
 476         kernel_bootstrap_thread_log("mapping_adjust");
 477         mapping_adjust();
 478
 479         /*
 480          *      Create the clock service.
 481          */
 482         kernel_bootstrap_thread_log("clock_service_create");
 483         clock_service_create();
 484
 485         /*
 486          *      Create the device service.
 487          */
 488         device_service_create();
 489
 490         kth_started = 1;
 491
 492 #if (defined(__i386__) || defined(__x86_64__)) && NCOPY_WINDOWS > 0
 493         /*
 494          * Create and initialize the physical copy window for processor 0
 495          * This is required before starting kicking off  IOKit.
 496          */
 497         cpu_physwindow_init(0);
 498 #endif
 499
 500
 501
 502 #if MACH_KDP
 503         kernel_bootstrap_log("kdp_init");
 504         kdp_init();
 505 #endif
 506
 507 #if ALTERNATE_DEBUGGER
 508         alternate_debugger_init();
 509 #endif
 510
 511 #if KPC
 512         kpc_init();
 513 #endif
 514
 515 #if CONFIG_ECC_LOGGING
 516         ecc_log_init();
 517 #endif
 518
 519 #if HYPERVISOR
 520         hv_support_init();
 521 #endif
 522
 523 #if CONFIG_TELEMETRY
 524         kernel_bootstrap_log("bootprofile_init");
 525         bootprofile_init();
 526 #endif
 527
 528 #if (defined(__i386__) || defined(__x86_64__)) && CONFIG_VMX
 529         vmx_init();
 530 #endif
 531
 532         kernel_bootstrap_thread_log("ktrace_init");
 533         ktrace_init();
 534
 535         kdebug_init(new_nkdbufs, trace_typefilter, trace_wrap);
 536
 537         kernel_bootstrap_log("prng_init");
 538         prng_cpu_init(master_cpu);
 539
 540 #ifdef  MACH_BSD
 541         kernel_bootstrap_log("bsd_early_init");
 542         bsd_early_init();
 543 #endif
 544
 545 #if defined(__arm64__)
 546     ml_lockdown_init();
 547 #endif
 548
 549 #ifdef  IOKIT
 550         kernel_bootstrap_log("PE_init_iokit");
 551         PE_init_iokit();
 552 #endif
 553
 554         assert(ml_get_interrupts_enabled() == FALSE);
 555
 556         /*
 557          * Past this point, kernel subsystems that expect to operate with
 558          * interrupts or preemption enabled may begin enforcement.
 559          */
 560         early_boot_complete = TRUE;
 561
 562 #if INTERRUPT_MASKED_DEBUG
 563         // Reset interrupts masked timeout before we enable interrupts
 564         ml_spin_debug_clear_self();
 565 #endif
 566         (void) spllo();         /* Allow interruptions */
 567
 568 #if (defined(__i386__) || defined(__x86_64__)) && NCOPY_WINDOWS > 0
 569         /*
 570          * Create and initialize the copy window for processor 0
 571          * This also allocates window space for all other processors.
 572          * However, this is dependent on the number of processors - so this call
 573          * must be after IOKit has been started because IOKit performs processor
 574          * discovery.
 575          */
 576         cpu_userwindow_init(0);
 577 #endif
 578
 579         /*
 580          *      Initialize the shared region module.
 581          */
 582         vm_shared_region_init();
 583         vm_commpage_init();
 584         vm_commpage_text_init();
 585
 586 #if CONFIG_MACF
 587         kernel_bootstrap_log("mac_policy_initmach");
 588         mac_policy_initmach();
 589 #if CONFIG_VNGUARD
 590         vnguard_policy_init();
 591 #endif
 592 #endif
 593
 594 #if defined(__arm__) || defined(__arm64__)
 595 #if CONFIG_KERNEL_INTEGRITY
 596         machine_lockdown_preflight();
 597 #endif
 598         /*
 599          *  Finalize protections on statically mapped pages now that comm page mapping is established.
 600          */
 601         arm_vm_prot_finalize(PE_state.bootArgs);
 602 #endif
 603
 604 #if CONFIG_SCHED_SFI
 605         kernel_bootstrap_log("sfi_init");
 606         sfi_init();
 607 #endif
 608
 609         /*
 610          * Initialize the globals used for permuting kernel
 611          * addresses that may be exported to userland as tokens
 612          * using VM_KERNEL_ADDRPERM()/VM_KERNEL_ADDRPERM_EXTERNAL().
 613          * Force the random number to be odd to avoid mapping a non-zero
 614          * word-aligned address to zero via addition.
 615          * Note: at this stage we can use the cryptographically secure PRNG
 616          * rather than early_random().
 617          */
 618         read_random(&vm_kernel_addrperm, sizeof(vm_kernel_addrperm));
 619         vm_kernel_addrperm |= 1;
 620         read_random(&buf_kernel_addrperm, sizeof(buf_kernel_addrperm));
 621         buf_kernel_addrperm |= 1;
 622         read_random(&vm_kernel_addrperm_ext, sizeof(vm_kernel_addrperm_ext));
 623         vm_kernel_addrperm_ext |= 1;
 624         read_random(&vm_kernel_addrhash_salt, sizeof(vm_kernel_addrhash_salt));
 625         read_random(&vm_kernel_addrhash_salt_ext, sizeof(vm_kernel_addrhash_salt_ext));
 626
 627         vm_set_restrictions();
 628
 629
 630
 631
 632         /*
 633          *      Start the user bootstrap.
 634          */
 635 #ifdef  MACH_BSD
 636         bsd_init();
 637 #endif
 638
 639     /*
 640      * Get rid of segments used to bootstrap kext loading. This removes
 641      * the KLD, PRELINK symtab, LINKEDIT, and symtab segments/load commands.
 642      */
 643         OSKextRemoveKextBootstrap();
 644
 645         /*
 646          * Get rid of pages used for early boot tracing.
 647          */
 648         kdebug_free_early_buf();
 649
 650         serial_keyboard_init();         /* Start serial keyboard if wanted */
 651
 652         vm_page_init_local_q();
 653
 654         thread_bind(PROCESSOR_NULL);
 655
 656         /*
 657          *      Become the pageout daemon.
 658          */
 659         vm_pageout();
 660         /*NOTREACHED*/
 661 }
 662
 663 /*
 664  *      slave_main:
 665  *
 666  *      Load the first thread to start a processor.
 667  */
 668 void
 669 slave_main(void *machine_param)
 670 {
 671         processor_t             processor = current_processor();
 672         thread_t                thread;
 673
 674         /*
 675          *      Use the idle processor thread if there
 676          *      is no dedicated start up thread.
 677          */
 678         if (processor->next_thread == THREAD_NULL) {
 679                 thread = processor->idle_thread;
 680                 thread->continuation = (thread_continue_t)processor_start_thread;
 681                 thread->parameter = machine_param;
 682         }
 683         else {
 684                 thread = processor->next_thread;
 685                 processor->next_thread = THREAD_NULL;
 686         }
 687
 688         load_context(thread);
 689         /*NOTREACHED*/
 690 }
 691
 692 /*
 693  *      processor_start_thread:
 694  *
 695  *      First thread to execute on a started processor.
 696  *
 697  *      Called at splsched.
 698  */
 699 void
 700 processor_start_thread(void *machine_param)
 701 {
 702         processor_t             processor = current_processor();
 703         thread_t                self = current_thread();
 704
 705         slave_machine_init(machine_param);
 706
 707         /*
 708          *      If running the idle processor thread,
 709          *      reenter the idle loop, else terminate.
 710          */
 711         if (self == processor->idle_thread)
 712                 thread_block((thread_continue_t)idle_thread);
 713
 714         thread_terminate(self);
 715         /*NOTREACHED*/
 716 }
 717
 718 /*
 719  *      load_context:
 720  *
 721  *      Start the first thread on a processor.
 722  */
 723 static void __attribute__((noreturn))
 724 load_context(
 725         thread_t                thread)
 726 {
 727         processor_t             processor = current_processor();
 728
 729
 730 #define load_context_kprintf(x...) /* kprintf("load_context: " x) */
 731
 732         load_context_kprintf("machine_set_current_thread\n");
 733         machine_set_current_thread(thread);
 734
 735         load_context_kprintf("processor_up\n");
 736         processor_up(processor);
 737
 738         PMAP_ACTIVATE_KERNEL(processor->cpu_id);
 739
 740         /*
 741          * Acquire a stack if none attached.  The panic
 742          * should never occur since the thread is expected
 743          * to have reserved stack.
 744          */
 745         load_context_kprintf("thread %p, stack %lx, stackptr %lx\n", thread,
 746                              thread->kernel_stack, thread->machine.kstackptr);
 747         if (!thread->kernel_stack) {
 748                 load_context_kprintf("stack_alloc_try\n");
 749                 if (!stack_alloc_try(thread))
 750                         panic("load_context");
 751         }
 752
 753         /*
 754          * The idle processor threads are not counted as
 755          * running for load calculations.
 756          */
 757         if (!(thread->state & TH_IDLE))
 758                 sched_run_incr(thread);
 759
 760         processor->active_thread = thread;
 761         processor_state_update_explicit(processor, thread->sched_pri,
 762                 SFI_CLASS_KERNEL, PSET_SMP, thread_get_perfcontrol_class(thread));
 763         processor->starting_pri = thread->sched_pri;
 764         processor->deadline = UINT64_MAX;
 765         thread->last_processor = processor;
 766
 767         processor->last_dispatch = mach_absolute_time();
 768         timer_start(&thread->system_timer, processor->last_dispatch);
 769         PROCESSOR_DATA(processor, thread_timer) = PROCESSOR_DATA(processor, kernel_timer) = &thread->system_timer;
 770
 771         timer_start(&PROCESSOR_DATA(processor, system_state), processor->last_dispatch);
 772         PROCESSOR_DATA(processor, current_state) = &PROCESSOR_DATA(processor, system_state);
 773
 774
 775         PMAP_ACTIVATE_USER(thread, processor->cpu_id);
 776
 777         load_context_kprintf("machine_load_context\n");
 778         machine_load_context(thread);
 779         /*NOTREACHED*/
 780 }
 781
 782 void
 783 scale_setup()
 784 {
 785         int scale = 0;
 786 #if defined(__LP64__)
 787         typeof(task_max) task_max_base = task_max;
 788
 789         /* Raise limits for servers with >= 16G */
 790         if ((serverperfmode != 0) && ((uint64_t)sane_size >= (uint64_t)(16 * 1024 * 1024 *1024ULL))) {
 791                 scale = (int)((uint64_t)sane_size / (uint64_t)(8 * 1024 * 1024 *1024ULL));
 792                 /* limit to 128 G */
 793                 if (scale > 16)
 794                         scale = 16;
 795                 task_max_base = 2500;
 796         /* Raise limits for machines with >= 3GB */
 797         } else if ((uint64_t)sane_size >= (uint64_t)(3 * 1024 * 1024 *1024ULL)) {
 798                 if ((uint64_t)sane_size < (uint64_t)(8 * 1024 * 1024 *1024ULL)) {
 799                         scale = 2;
 800                 } else {
 801                         /* limit to 64GB */
 802                         scale = MIN(16, (int)((uint64_t)sane_size / (uint64_t)(4 * 1024 * 1024 *1024ULL)));
 803                 }
 804         }
 805
 806         task_max = MAX(task_max, task_max_base * scale);
 807
 808         if (scale != 0) {
 809                 task_threadmax = task_max;
 810                 thread_max = task_max * 5;
 811         }
 812
 813 #endif
 814
 815         bsd_scale_setup(scale);
 816
 817         ipc_space_max = SPACE_MAX;
 818         ipc_port_max = PORT_MAX;
 819         ipc_pset_max = SET_MAX;
 820         semaphore_max = SEMAPHORE_MAX;
 821 }
 822