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
 126
 127 #if CONFIG_ATM
 128 #include <atm/atm_internal.h>
 129 #endif
 130
 131 #if CONFIG_CSR
 132 #include <sys/csr.h>
 133 #endif
 134
 135 #if CONFIG_BANK
 136 #include <bank/bank_internal.h>
 137 #endif
 138
 139 #if ALTERNATE_DEBUGGER
 140 #include <arm64/alternate_debugger.h>
 141 #endif
 142
 143 #if MACH_KDP
 144 #include <kdp/kdp.h>
 145 #endif
 146
 147 #if CONFIG_MACF
 148 #include <security/mac_mach_internal.h>
 149 #endif
 150
 151 #if KPC
 152 #include <kern/kpc.h>
 153 #endif
 154
 155 #if HYPERVISOR
 156 #include <kern/hv_support.h>
 157 #endif
 158
 159
 160 #include <i386/pmCPU.h>
 161 static void             kernel_bootstrap_thread(void);
 162
 163 static void             load_context(
 164                                         thread_t        thread);
 165 #if (defined(__i386__) || defined(__x86_64__)) && NCOPY_WINDOWS > 0
 166 extern void cpu_userwindow_init(int);
 167 extern void cpu_physwindow_init(int);
 168 #endif
 169
 170 #if CONFIG_ECC_LOGGING
 171 #include <kern/ecc.h>
 172 #endif
 173
 174 #if (defined(__i386__) || defined(__x86_64__)) && CONFIG_VMX
 175 #include <i386/vmx/vmx_cpu.h>
 176 #endif
 177
 178 // libkern/OSKextLib.cpp
 179 extern void     OSKextRemoveKextBootstrap(void);
 180
 181 void scale_setup(void);
 182 extern void bsd_scale_setup(int);
 183 extern unsigned int semaphore_max;
 184 extern void stackshot_init(void);
 185 extern void ktrace_init(void);
 186 extern void oslog_init(void);
 187
 188 /*
 189  *      Running in virtual memory, on the interrupt stack.
 190  */
 191
 192 extern int serverperfmode;
 193
 194 /* size of kernel trace buffer, disabled by default */
 195 unsigned int new_nkdbufs = 0;
 196 unsigned int wake_nkdbufs = 0;
 197 unsigned int write_trace_on_panic = 0;
 198 static char trace_typefilter[64] = { 0 };
 199 boolean_t trace_serial = FALSE;
 200 boolean_t oslog_early_boot_complete = FALSE;
 201
 202 /* mach leak logging */
 203 int log_leaks = 0;
 204
 205 static inline void
 206 kernel_bootstrap_log(const char *message)
 207 {
 208 //      kprintf("kernel_bootstrap: %s\n", message);
 209         kernel_debug_string_early(message);
 210 }
 211
 212 static inline void
 213 kernel_bootstrap_thread_log(const char *message)
 214 {
 215 //      kprintf("kernel_bootstrap_thread: %s\n", message);
 216         kernel_debug_string_early(message);
 217 }
 218
 219 void
 220 kernel_early_bootstrap(void)
 221 {
 222         /* serverperfmode is needed by timer setup */
 223         if (PE_parse_boot_argn("serverperfmode", &serverperfmode, sizeof (serverperfmode))) {
 224                 serverperfmode = 1;
 225         }
 226
 227         lck_mod_init();
 228
 229         /*
 230          * Initialize the timer callout world
 231          */
 232         timer_call_init();
 233
 234 #if CONFIG_SCHED_SFI
 235         /*
 236          * Configure SFI classes
 237          */
 238         sfi_early_init();
 239 #endif
 240 }
 241
 242 extern boolean_t IORamDiskBSDRoot(void);
 243 extern kern_return_t cpm_preallocate_early(void);
 244
 245 void
 246 kernel_bootstrap(void)
 247 {
 248         kern_return_t   result;
 249         thread_t        thread;
 250         char            namep[16];
 251
 252         printf("%s\n", version); /* log kernel version */
 253
 254         if (PE_parse_boot_argn("-l", namep, sizeof (namep))) /* leaks logging */
 255                 log_leaks = 1;
 256
 257         PE_parse_boot_argn("trace", &new_nkdbufs, sizeof (new_nkdbufs));
 258         PE_parse_boot_argn("trace_wake", &wake_nkdbufs, sizeof (wake_nkdbufs));
 259         PE_parse_boot_argn("trace_panic", &write_trace_on_panic, sizeof(write_trace_on_panic));
 260         PE_parse_boot_arg_str("trace_typefilter", trace_typefilter, sizeof(trace_typefilter));
 261
 262         scale_setup();
 263
 264         kernel_bootstrap_log("vm_mem_bootstrap");
 265         vm_mem_bootstrap();
 266
 267         kernel_bootstrap_log("cs_init");
 268         cs_init();
 269
 270         kernel_bootstrap_log("vm_mem_init");
 271         vm_mem_init();
 272
 273         machine_info.memory_size = (uint32_t)mem_size;
 274         machine_info.max_mem = max_mem;
 275         machine_info.major_version = version_major;
 276         machine_info.minor_version = version_minor;
 277
 278         oslog_init();
 279
 280 #if CONFIG_TELEMETRY
 281         kernel_bootstrap_log("telemetry_init");
 282         telemetry_init();
 283 #endif
 284
 285 #if CONFIG_CSR
 286         kernel_bootstrap_log("csr_init");
 287         csr_init();
 288 #endif
 289
 290         if (PE_i_can_has_debugger(NULL) &&
 291             PE_parse_boot_argn("-show_pointers", &namep, sizeof (namep))) {
 292                 doprnt_hide_pointers = FALSE;
 293         }
 294
 295         kernel_bootstrap_log("console_init");
 296         console_init();
 297
 298         kernel_bootstrap_log("stackshot_init");
 299         stackshot_init();
 300
 301         kernel_bootstrap_log("sched_init");
 302         sched_init();
 303
 304         kernel_bootstrap_log("ltable_bootstrap");
 305         ltable_bootstrap();
 306
 307         kernel_bootstrap_log("waitq_bootstrap");
 308         waitq_bootstrap();
 309
 310         kernel_bootstrap_log("ipc_bootstrap");
 311         ipc_bootstrap();
 312
 313 #if CONFIG_MACF
 314         kernel_bootstrap_log("mac_policy_init");
 315         mac_policy_init();
 316 #endif
 317
 318         kernel_bootstrap_log("ipc_init");
 319         ipc_init();
 320
 321         /*
 322          * As soon as the virtual memory system is up, we record
 323          * that this CPU is using the kernel pmap.
 324          */
 325         kernel_bootstrap_log("PMAP_ACTIVATE_KERNEL");
 326         PMAP_ACTIVATE_KERNEL(master_cpu);
 327
 328         kernel_bootstrap_log("mapping_free_prime");
 329         mapping_free_prime();                                           /* Load up with temporary mapping blocks */
 330
 331         kernel_bootstrap_log("machine_init");
 332         machine_init();
 333
 334         kernel_bootstrap_log("clock_init");
 335         clock_init();
 336
 337         ledger_init();
 338
 339         /*
 340          *      Initialize the IPC, task, and thread subsystems.
 341          */
 342 #if CONFIG_COALITIONS
 343         kernel_bootstrap_log("coalitions_init");
 344         coalitions_init();
 345 #endif
 346
 347         kernel_bootstrap_log("task_init");
 348         task_init();
 349
 350         kernel_bootstrap_log("thread_init");
 351         thread_init();
 352
 353 #if CONFIG_ATM
 354         /* Initialize the Activity Trace Resource Manager. */
 355         kernel_bootstrap_log("atm_init");
 356         atm_init();
 357 #endif
 358         kernel_bootstrap_log("mach_init_activity_id");
 359         mach_init_activity_id();
 360
 361 #if CONFIG_BANK
 362         /* Initialize the BANK Manager. */
 363         kernel_bootstrap_log("bank_init");
 364         bank_init();
 365 #endif
 366
 367         kernel_bootstrap_log("ipc_pthread_priority_init");
 368         ipc_pthread_priority_init();
 369
 370         /* initialize the corpse config based on boot-args */
 371         corpses_init();
 372
 373         vm_user_init();
 374
 375         /*
 376          *      Create a kernel thread to execute the kernel bootstrap.
 377          */
 378         kernel_bootstrap_log("kernel_thread_create");
 379         result = kernel_thread_create((thread_continue_t)kernel_bootstrap_thread, NULL, MAXPRI_KERNEL, &thread);
 380
 381         if (result != KERN_SUCCESS) panic("kernel_bootstrap: result = %08X\n", result);
 382
 383         thread->state = TH_RUN;
 384         thread->last_made_runnable_time = mach_absolute_time();
 385         thread_deallocate(thread);
 386
 387         kernel_bootstrap_log("load_context - done");
 388         load_context(thread);
 389         /*NOTREACHED*/
 390 }
 391
 392 int kth_started = 0;
 393
 394 vm_offset_t vm_kernel_addrperm;
 395 vm_offset_t buf_kernel_addrperm;
 396 vm_offset_t vm_kernel_addrperm_ext;
 397
 398 /*
 399  * Now running in a thread.  Kick off other services,
 400  * invoke user bootstrap, enter pageout loop.
 401  */
 402 static void
 403 kernel_bootstrap_thread(void)
 404 {
 405         processor_t             processor = current_processor();
 406
 407 #define kernel_bootstrap_thread_kprintf(x...) /* kprintf("kernel_bootstrap_thread: " x) */
 408         kernel_bootstrap_thread_log("idle_thread_create");
 409         /*
 410          * Create the idle processor thread.
 411          */
 412         idle_thread_create(processor);
 413
 414         /*
 415          * N.B. Do not stick anything else
 416          * before this point.
 417          *
 418          * Start up the scheduler services.
 419          */
 420         kernel_bootstrap_thread_log("sched_startup");
 421         sched_startup();
 422
 423         /*
 424          * Thread lifecycle maintenance (teardown, stack allocation)
 425          */
 426         kernel_bootstrap_thread_log("thread_daemon_init");
 427         thread_daemon_init();
 428
 429         /* Create kernel map entry reserve */
 430         vm_kernel_reserved_entry_init();
 431
 432         /*
 433          * Thread callout service.
 434          */
 435         kernel_bootstrap_thread_log("thread_call_initialize");
 436         thread_call_initialize();
 437
 438         /*
 439          * Remain on current processor as
 440          * additional processors come online.
 441          */
 442         kernel_bootstrap_thread_log("thread_bind");
 443         thread_bind(processor);
 444
 445
 446         /*
 447          * Initialize ipc thread call support.
 448          */
 449         kernel_bootstrap_thread_log("ipc_thread_call_init");
 450         ipc_thread_call_init();
 451
 452         /*
 453          * Kick off memory mapping adjustments.
 454          */
 455         kernel_bootstrap_thread_log("mapping_adjust");
 456         mapping_adjust();
 457
 458         /*
 459          *      Create the clock service.
 460          */
 461         kernel_bootstrap_thread_log("clock_service_create");
 462         clock_service_create();
 463
 464         /*
 465          *      Create the device service.
 466          */
 467         device_service_create();
 468
 469         kth_started = 1;
 470
 471 #if (defined(__i386__) || defined(__x86_64__)) && NCOPY_WINDOWS > 0
 472         /*
 473          * Create and initialize the physical copy window for processor 0
 474          * This is required before starting kicking off  IOKit.
 475          */
 476         cpu_physwindow_init(0);
 477 #endif
 478
 479
 480
 481 #if MACH_KDP
 482         kernel_bootstrap_log("kdp_init");
 483         kdp_init();
 484 #endif
 485
 486 #if ALTERNATE_DEBUGGER
 487         alternate_debugger_init();
 488 #endif
 489
 490 #if KPC
 491         kpc_init();
 492 #endif
 493
 494 #if CONFIG_ECC_LOGGING
 495         ecc_log_init();
 496 #endif
 497
 498 #if HYPERVISOR
 499         hv_support_init();
 500 #endif
 501
 502 #if CONFIG_TELEMETRY
 503         kernel_bootstrap_log("bootprofile_init");
 504         bootprofile_init();
 505 #endif
 506
 507 #if (defined(__i386__) || defined(__x86_64__)) && CONFIG_VMX
 508         vmx_init();
 509 #endif
 510
 511         kernel_bootstrap_thread_log("ktrace_init");
 512         ktrace_init();
 513
 514         if (new_nkdbufs > 0 || kdebug_serial || log_leaks) {
 515                 kdebug_boot_trace(new_nkdbufs, trace_typefilter);
 516         }
 517
 518         kernel_bootstrap_log("prng_init");
 519         prng_cpu_init(master_cpu);
 520
 521 #ifdef  MACH_BSD
 522         kernel_bootstrap_log("bsd_early_init");
 523         bsd_early_init();
 524 #endif
 525
 526 #ifdef  IOKIT
 527         kernel_bootstrap_log("PE_init_iokit");
 528         PE_init_iokit();
 529 #endif
 530
 531         assert(ml_get_interrupts_enabled() == FALSE);
 532
 533         // Set this flag to indicate that it is now okay to start testing
 534         // for interrupts / preemeption disabled while logging
 535         oslog_early_boot_complete = TRUE;
 536
 537         (void) spllo();         /* Allow interruptions */
 538
 539 #if (defined(__i386__) || defined(__x86_64__)) && NCOPY_WINDOWS > 0
 540         /*
 541          * Create and initialize the copy window for processor 0
 542          * This also allocates window space for all other processors.
 543          * However, this is dependent on the number of processors - so this call
 544          * must be after IOKit has been started because IOKit performs processor
 545          * discovery.
 546          */
 547         cpu_userwindow_init(0);
 548 #endif
 549
 550         /*
 551          *      Initialize the shared region module.
 552          */
 553         vm_shared_region_init();
 554         vm_commpage_init();
 555         vm_commpage_text_init();
 556
 557 #if CONFIG_MACF
 558         kernel_bootstrap_log("mac_policy_initmach");
 559         mac_policy_initmach();
 560 #endif
 561
 562
 563 #if CONFIG_SCHED_SFI
 564         kernel_bootstrap_log("sfi_init");
 565         sfi_init();
 566 #endif
 567
 568         /*
 569          * Initialize the globals used for permuting kernel
 570          * addresses that may be exported to userland as tokens
 571          * using VM_KERNEL_ADDRPERM()/VM_KERNEL_ADDRPERM_EXTERNAL().
 572          * Force the random number to be odd to avoid mapping a non-zero
 573          * word-aligned address to zero via addition.
 574          * Note: at this stage we can use the cryptographically secure PRNG
 575          * rather than early_random().
 576          */
 577         read_random(&vm_kernel_addrperm, sizeof(vm_kernel_addrperm));
 578         vm_kernel_addrperm |= 1;
 579         read_random(&buf_kernel_addrperm, sizeof(buf_kernel_addrperm));
 580         buf_kernel_addrperm |= 1;
 581         read_random(&vm_kernel_addrperm_ext, sizeof(vm_kernel_addrperm_ext));
 582         vm_kernel_addrperm_ext |= 1;
 583
 584         vm_set_restrictions();
 585
 586
 587
 588         /*
 589          *      Start the user bootstrap.
 590          */
 591 #ifdef  MACH_BSD
 592         bsd_init();
 593 #endif
 594
 595     /*
 596      * Get rid of segments used to bootstrap kext loading. This removes
 597      * the KLD, PRELINK symtab, LINKEDIT, and symtab segments/load commands.
 598      */
 599         OSKextRemoveKextBootstrap();
 600
 601         serial_keyboard_init();         /* Start serial keyboard if wanted */
 602
 603         vm_page_init_local_q();
 604
 605         thread_bind(PROCESSOR_NULL);
 606
 607         /*
 608          *      Become the pageout daemon.
 609          */
 610         vm_pageout();
 611         /*NOTREACHED*/
 612 }
 613
 614 /*
 615  *      slave_main:
 616  *
 617  *      Load the first thread to start a processor.
 618  */
 619 void
 620 slave_main(void *machine_param)
 621 {
 622         processor_t             processor = current_processor();
 623         thread_t                thread;
 624
 625         /*
 626          *      Use the idle processor thread if there
 627          *      is no dedicated start up thread.
 628          */
 629         if (processor->next_thread == THREAD_NULL) {
 630                 thread = processor->idle_thread;
 631                 thread->continuation = (thread_continue_t)processor_start_thread;
 632                 thread->parameter = machine_param;
 633         }
 634         else {
 635                 thread = processor->next_thread;
 636                 processor->next_thread = THREAD_NULL;
 637         }
 638
 639         load_context(thread);
 640         /*NOTREACHED*/
 641 }
 642
 643 /*
 644  *      processor_start_thread:
 645  *
 646  *      First thread to execute on a started processor.
 647  *
 648  *      Called at splsched.
 649  */
 650 void
 651 processor_start_thread(void *machine_param)
 652 {
 653         processor_t             processor = current_processor();
 654         thread_t                self = current_thread();
 655
 656         slave_machine_init(machine_param);
 657
 658         /*
 659          *      If running the idle processor thread,
 660          *      reenter the idle loop, else terminate.
 661          */
 662         if (self == processor->idle_thread)
 663                 thread_block((thread_continue_t)idle_thread);
 664
 665         thread_terminate(self);
 666         /*NOTREACHED*/
 667 }
 668
 669 /*
 670  *      load_context:
 671  *
 672  *      Start the first thread on a processor.
 673  */
 674 static void
 675 load_context(
 676         thread_t                thread)
 677 {
 678         processor_t             processor = current_processor();
 679
 680
 681 #define load_context_kprintf(x...) /* kprintf("load_context: " x) */
 682
 683         load_context_kprintf("machine_set_current_thread\n");
 684         machine_set_current_thread(thread);
 685
 686         load_context_kprintf("processor_up\n");
 687         processor_up(processor);
 688
 689         PMAP_ACTIVATE_KERNEL(processor->cpu_id);
 690
 691         /*
 692          * Acquire a stack if none attached.  The panic
 693          * should never occur since the thread is expected
 694          * to have reserved stack.
 695          */
 696         load_context_kprintf("thread %p, stack %lx, stackptr %lx\n", thread,
 697                              thread->kernel_stack, thread->machine.kstackptr);
 698         if (!thread->kernel_stack) {
 699                 load_context_kprintf("stack_alloc_try\n");
 700                 if (!stack_alloc_try(thread))
 701                         panic("load_context");
 702         }
 703
 704         /*
 705          * The idle processor threads are not counted as
 706          * running for load calculations.
 707          */
 708         if (!(thread->state & TH_IDLE))
 709                 sched_run_incr(thread);
 710
 711         processor->active_thread = thread;
 712         processor->current_pri = thread->sched_pri;
 713         processor->current_thmode = thread->sched_mode;
 714         processor->current_sfi_class = SFI_CLASS_KERNEL;
 715         processor->starting_pri = thread->sched_pri;
 716
 717         processor->deadline = UINT64_MAX;
 718         thread->last_processor = processor;
 719
 720         processor->last_dispatch = mach_absolute_time();
 721         timer_start(&thread->system_timer, processor->last_dispatch);
 722         PROCESSOR_DATA(processor, thread_timer) = PROCESSOR_DATA(processor, kernel_timer) = &thread->system_timer;
 723
 724         timer_start(&PROCESSOR_DATA(processor, system_state), processor->last_dispatch);
 725         PROCESSOR_DATA(processor, current_state) = &PROCESSOR_DATA(processor, system_state);
 726
 727         PMAP_ACTIVATE_USER(thread, processor->cpu_id);
 728
 729         load_context_kprintf("machine_load_context\n");
 730         machine_load_context(thread);
 731         /*NOTREACHED*/
 732 }
 733
 734 void
 735 scale_setup()
 736 {
 737         int scale = 0;
 738 #if defined(__LP64__)
 739         typeof(task_max) task_max_base = task_max;
 740
 741         /* Raise limits for servers with >= 16G */
 742         if ((serverperfmode != 0) && ((uint64_t)sane_size >= (uint64_t)(16 * 1024 * 1024 *1024ULL))) {
 743                 scale = (int)((uint64_t)sane_size / (uint64_t)(8 * 1024 * 1024 *1024ULL));
 744                 /* limit to 128 G */
 745                 if (scale > 16)
 746                         scale = 16;
 747                 task_max_base = 2500;
 748         } else if ((uint64_t)sane_size >= (uint64_t)(3 * 1024 * 1024 *1024ULL))
 749                 scale = 2;
 750
 751         task_max = MAX(task_max, task_max_base * scale);
 752
 753         if (scale != 0) {
 754                 task_threadmax = task_max;
 755                 thread_max = task_max * 5;
 756         }
 757
 758 #endif
 759
 760         bsd_scale_setup(scale);
 761
 762         ipc_space_max = SPACE_MAX;
 763         ipc_port_max = PORT_MAX;
 764         ipc_pset_max = SET_MAX;
 765         semaphore_max = SEMAPHORE_MAX;
 766 }
 767