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
 120 #include <kern/waitq.h>
 121
 122
 123 #if CONFIG_ATM
 124 #include <atm/atm_internal.h>
 125 #endif
 126
 127 #if CONFIG_CSR
 128 #include <sys/csr.h>
 129 #endif
 130
 131 #if CONFIG_BANK
 132 #include <bank/bank_internal.h>
 133 #endif
 134
 135 #if ALTERNATE_DEBUGGER
 136 #include <arm64/alternate_debugger.h>
 137 #endif
 138
 139 #if MACH_KDP
 140 #include <kdp/kdp.h>
 141 #endif
 142
 143 #if CONFIG_MACF
 144 #include <security/mac_mach_internal.h>
 145 #endif
 146
 147 #if KPC
 148 #include <kern/kpc.h>
 149 #endif
 150
 151 #if KPERF
 152 #include <kperf/kperf.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_lock_init(void);
 185 extern void console_init(void);
 186
 187 /*
 188  *      Running in virtual memory, on the interrupt stack.
 189  */
 190
 191 extern int serverperfmode;
 192
 193 /* size of kernel trace buffer, disabled by default */
 194 unsigned int new_nkdbufs = 0;
 195 unsigned int wake_nkdbufs = 0;
 196 unsigned int write_trace_on_panic = 0;
 197 unsigned int trace_typefilter = 0;
 198 boolean_t    trace_serial = FALSE;
 199
 200 /* mach leak logging */
 201 int log_leaks = 0;
 202 int turn_on_log_leaks = 0;
 203
 204 static inline void
 205 kernel_bootstrap_log(const char *message)
 206 {
 207 //      kprintf("kernel_bootstrap: %s\n", message);
 208         kernel_debug_string_simple(message);
 209 }
 210
 211 static inline void
 212 kernel_bootstrap_thread_log(const char *message)
 213 {
 214 //      kprintf("kernel_bootstrap_thread: %s\n", message);
 215         kernel_debug_string_simple(message);
 216 }
 217
 218 void
 219 kernel_early_bootstrap(void)
 220 {
 221         /* serverperfmode is needed by timer setup */
 222         if (PE_parse_boot_argn("serverperfmode", &serverperfmode, sizeof (serverperfmode))) {
 223                 serverperfmode = 1;
 224         }
 225
 226         lck_mod_init();
 227
 228         /*
 229          * Initialize the timer callout world
 230          */
 231         timer_call_init();
 232
 233 #if CONFIG_SCHED_SFI
 234         /*
 235          * Configure SFI classes
 236          */
 237         sfi_early_init();
 238 #endif
 239 }
 240
 241 extern boolean_t IORamDiskBSDRoot(void);
 242 extern kern_return_t cpm_preallocate_early(void);
 243
 244 void
 245 kernel_bootstrap(void)
 246 {
 247         kern_return_t   result;
 248         thread_t        thread;
 249         char            namep[16];
 250
 251         printf("%s\n", version); /* log kernel version */
 252
 253         if (PE_parse_boot_argn("-l", namep, sizeof (namep))) /* leaks logging */
 254                 turn_on_log_leaks = 1;
 255
 256         PE_parse_boot_argn("trace", &new_nkdbufs, sizeof (new_nkdbufs));
 257         PE_parse_boot_argn("trace_wake", &wake_nkdbufs, sizeof (wake_nkdbufs));
 258         PE_parse_boot_argn("trace_panic", &write_trace_on_panic, sizeof(write_trace_on_panic));
 259         PE_parse_boot_argn("trace_typefilter", &trace_typefilter, sizeof(trace_typefilter));
 260
 261         scale_setup();
 262
 263         kernel_bootstrap_log("vm_mem_bootstrap");
 264         vm_mem_bootstrap();
 265
 266         kernel_bootstrap_log("cs_init");
 267         cs_init();
 268
 269         kernel_bootstrap_log("vm_mem_init");
 270         vm_mem_init();
 271
 272         machine_info.memory_size = (uint32_t)mem_size;
 273         machine_info.max_mem = max_mem;
 274         machine_info.major_version = version_major;
 275         machine_info.minor_version = version_minor;
 276
 277
 278 #if CONFIG_TELEMETRY
 279         kernel_bootstrap_log("telemetry_init");
 280         telemetry_init();
 281 #endif
 282
 283 #if CONFIG_CSR
 284         kernel_bootstrap_log("csr_init");
 285         csr_init();
 286 #endif
 287
 288         if (PE_i_can_has_debugger(NULL) &&
 289             PE_parse_boot_argn("-show_pointers", &namep, sizeof (namep))) {
 290                 doprnt_hide_pointers = FALSE;
 291         }
 292
 293         kernel_bootstrap_log("console_init");
 294         console_init();
 295
 296         kernel_bootstrap_log("stackshot_lock_init");
 297         stackshot_lock_init();
 298
 299         kernel_bootstrap_log("sched_init");
 300         sched_init();
 301
 302         kernel_bootstrap_log("waitq_bootstrap");
 303         waitq_bootstrap();
 304
 305         kernel_bootstrap_log("ipc_bootstrap");
 306         ipc_bootstrap();
 307
 308 #if CONFIG_MACF
 309         kernel_bootstrap_log("mac_policy_init");
 310         mac_policy_init();
 311 #endif
 312
 313         kernel_bootstrap_log("ipc_init");
 314         ipc_init();
 315
 316         /*
 317          * As soon as the virtual memory system is up, we record
 318          * that this CPU is using the kernel pmap.
 319          */
 320         kernel_bootstrap_log("PMAP_ACTIVATE_KERNEL");
 321         PMAP_ACTIVATE_KERNEL(master_cpu);
 322
 323         kernel_bootstrap_log("mapping_free_prime");
 324         mapping_free_prime();                                           /* Load up with temporary mapping blocks */
 325
 326         kernel_bootstrap_log("machine_init");
 327         machine_init();
 328
 329         kernel_bootstrap_log("clock_init");
 330         clock_init();
 331
 332         ledger_init();
 333
 334         /*
 335          *      Initialize the IPC, task, and thread subsystems.
 336          */
 337 #if CONFIG_COALITIONS
 338         kernel_bootstrap_log("coalitions_init");
 339         coalitions_init();
 340 #endif
 341
 342         kernel_bootstrap_log("task_init");
 343         task_init();
 344
 345         kernel_bootstrap_log("thread_init");
 346         thread_init();
 347
 348 #if CONFIG_ATM
 349         /* Initialize the Activity Trace Resource Manager. */
 350         kernel_bootstrap_log("atm_init");
 351         atm_init();
 352 #endif
 353
 354 #if CONFIG_BANK
 355         /* Initialize the BANK Manager. */
 356         kernel_bootstrap_log("bank_init");
 357         bank_init();
 358 #endif
 359
 360         /* initialize the corpse config based on boot-args */
 361         corpses_init();
 362
 363         /*
 364          *      Create a kernel thread to execute the kernel bootstrap.
 365          */
 366         kernel_bootstrap_log("kernel_thread_create");
 367         result = kernel_thread_create((thread_continue_t)kernel_bootstrap_thread, NULL, MAXPRI_KERNEL, &thread);
 368
 369         if (result != KERN_SUCCESS) panic("kernel_bootstrap: result = %08X\n", result);
 370
 371         thread->state = TH_RUN;
 372         thread->last_made_runnable_time = mach_absolute_time();
 373         thread_deallocate(thread);
 374
 375         kernel_bootstrap_log("load_context - done");
 376         load_context(thread);
 377         /*NOTREACHED*/
 378 }
 379
 380 int kth_started = 0;
 381
 382 vm_offset_t vm_kernel_addrperm;
 383 vm_offset_t buf_kernel_addrperm;
 384 vm_offset_t vm_kernel_addrperm_ext;
 385
 386 /*
 387  * Now running in a thread.  Kick off other services,
 388  * invoke user bootstrap, enter pageout loop.
 389  */
 390 static void
 391 kernel_bootstrap_thread(void)
 392 {
 393         processor_t             processor = current_processor();
 394
 395 #define kernel_bootstrap_thread_kprintf(x...) /* kprintf("kernel_bootstrap_thread: " x) */
 396         kernel_bootstrap_thread_log("idle_thread_create");
 397         /*
 398          * Create the idle processor thread.
 399          */
 400         idle_thread_create(processor);
 401
 402         /*
 403          * N.B. Do not stick anything else
 404          * before this point.
 405          *
 406          * Start up the scheduler services.
 407          */
 408         kernel_bootstrap_thread_log("sched_startup");
 409         sched_startup();
 410
 411         /*
 412          * Thread lifecycle maintenance (teardown, stack allocation)
 413          */
 414         kernel_bootstrap_thread_log("thread_daemon_init");
 415         thread_daemon_init();
 416
 417         /* Create kernel map entry reserve */
 418         vm_kernel_reserved_entry_init();
 419
 420         /*
 421          * Thread callout service.
 422          */
 423         kernel_bootstrap_thread_log("thread_call_initialize");
 424         thread_call_initialize();
 425
 426         /*
 427          * Remain on current processor as
 428          * additional processors come online.
 429          */
 430         kernel_bootstrap_thread_log("thread_bind");
 431         thread_bind(processor);
 432
 433         /*
 434          * Initialize ipc thread call support.
 435          */
 436         kernel_bootstrap_thread_log("ipc_thread_call_init");
 437         ipc_thread_call_init();
 438
 439         /*
 440          * Kick off memory mapping adjustments.
 441          */
 442         kernel_bootstrap_thread_log("mapping_adjust");
 443         mapping_adjust();
 444
 445         /*
 446          *      Create the clock service.
 447          */
 448         kernel_bootstrap_thread_log("clock_service_create");
 449         clock_service_create();
 450
 451         /*
 452          *      Create the device service.
 453          */
 454         device_service_create();
 455
 456         kth_started = 1;
 457
 458 #if (defined(__i386__) || defined(__x86_64__)) && NCOPY_WINDOWS > 0
 459         /*
 460          * Create and initialize the physical copy window for processor 0
 461          * This is required before starting kicking off  IOKit.
 462          */
 463         cpu_physwindow_init(0);
 464 #endif
 465
 466
 467
 468 #if MACH_KDP
 469         kernel_bootstrap_log("kdp_init");
 470         kdp_init();
 471 #endif
 472
 473 #if ALTERNATE_DEBUGGER
 474         alternate_debugger_init();
 475 #endif
 476
 477 #if KPC
 478         kpc_init();
 479 #endif
 480
 481 #if CONFIG_ECC_LOGGING
 482         ecc_log_init();
 483 #endif
 484
 485 #if KPERF
 486         kperf_bootstrap();
 487 #endif
 488
 489 #if HYPERVISOR
 490         hv_support_init();
 491 #endif
 492
 493 #if CONFIG_TELEMETRY
 494         kernel_bootstrap_log("bootprofile_init");
 495         bootprofile_init();
 496 #endif
 497
 498 #if (defined(__i386__) || defined(__x86_64__)) && CONFIG_VMX
 499         vmx_init();
 500 #endif
 501
 502 #if (defined(__i386__) || defined(__x86_64__))
 503         if (kdebug_serial) {
 504                 new_nkdbufs = 1;
 505                 if (trace_typefilter == 0)
 506                         trace_typefilter = 1;
 507         }
 508         if (turn_on_log_leaks && !new_nkdbufs)
 509                 new_nkdbufs = 200000;
 510         if (trace_typefilter)
 511                 start_kern_tracing_with_typefilter(new_nkdbufs,
 512                                                    FALSE,
 513                                                    trace_typefilter);
 514         else
 515                 start_kern_tracing(new_nkdbufs, FALSE);
 516         if (turn_on_log_leaks)
 517                 log_leaks = 1;
 518
 519 #endif
 520
 521         kernel_bootstrap_log("prng_init");
 522         prng_cpu_init(master_cpu);
 523
 524 #ifdef  IOKIT
 525         PE_init_iokit();
 526 #endif
 527
 528         assert(ml_get_interrupts_enabled() == FALSE);
 529         (void) spllo();         /* Allow interruptions */
 530
 531 #if (defined(__i386__) || defined(__x86_64__)) && NCOPY_WINDOWS > 0
 532         /*
 533          * Create and initialize the copy window for processor 0
 534          * This also allocates window space for all other processors.
 535          * However, this is dependent on the number of processors - so this call
 536          * must be after IOKit has been started because IOKit performs processor
 537          * discovery.
 538          */
 539         cpu_userwindow_init(0);
 540 #endif
 541
 542 #if (!defined(__i386__) && !defined(__x86_64__))
 543         if (turn_on_log_leaks && !new_nkdbufs)
 544                 new_nkdbufs = 200000;
 545         if (trace_typefilter)
 546                 start_kern_tracing_with_typefilter(new_nkdbufs, FALSE, trace_typefilter);
 547         else
 548                 start_kern_tracing(new_nkdbufs, FALSE);
 549         if (turn_on_log_leaks)
 550                 log_leaks = 1;
 551 #endif
 552
 553         /*
 554          *      Initialize the shared region module.
 555          */
 556         vm_shared_region_init();
 557         vm_commpage_init();
 558         vm_commpage_text_init();
 559
 560 #if CONFIG_MACF
 561         kernel_bootstrap_log("mac_policy_initmach");
 562         mac_policy_initmach();
 563 #endif
 564
 565
 566 #if CONFIG_SCHED_SFI
 567         kernel_bootstrap_log("sfi_init");
 568         sfi_init();
 569 #endif
 570
 571         /*
 572          * Initialize the globals used for permuting kernel
 573          * addresses that may be exported to userland as tokens
 574          * using VM_KERNEL_ADDRPERM()/VM_KERNEL_ADDRPERM_EXTERNAL().
 575          * Force the random number to be odd to avoid mapping a non-zero
 576          * word-aligned address to zero via addition.
 577          * Note: at this stage we can use the cryptographically secure PRNG
 578          * rather than early_random().
 579          */
 580         read_random(&vm_kernel_addrperm, sizeof(vm_kernel_addrperm));
 581         vm_kernel_addrperm |= 1;
 582         read_random(&buf_kernel_addrperm, sizeof(buf_kernel_addrperm));
 583         buf_kernel_addrperm |= 1;
 584         read_random(&vm_kernel_addrperm_ext, sizeof(vm_kernel_addrperm_ext));
 585         vm_kernel_addrperm_ext |= 1;
 586
 587         vm_set_restrictions();
 588
 589
 590
 591         /*
 592          *      Start the user bootstrap.
 593          */
 594 #ifdef  MACH_BSD
 595         bsd_init();
 596 #endif
 597
 598     /*
 599      * Get rid of segments used to bootstrap kext loading. This removes
 600      * the KLD, PRELINK symtab, LINKEDIT, and symtab segments/load commands.
 601      */
 602         OSKextRemoveKextBootstrap();
 603
 604         serial_keyboard_init();         /* Start serial keyboard if wanted */
 605
 606         vm_page_init_local_q();
 607
 608         thread_bind(PROCESSOR_NULL);
 609
 610         /*
 611          *      Become the pageout daemon.
 612          */
 613         vm_pageout();
 614         /*NOTREACHED*/
 615 }
 616
 617 /*
 618  *      slave_main:
 619  *
 620  *      Load the first thread to start a processor.
 621  */
 622 void
 623 slave_main(void *machine_param)
 624 {
 625         processor_t             processor = current_processor();
 626         thread_t                thread;
 627
 628         /*
 629          *      Use the idle processor thread if there
 630          *      is no dedicated start up thread.
 631          */
 632         if (processor->next_thread == THREAD_NULL) {
 633                 thread = processor->idle_thread;
 634                 thread->continuation = (thread_continue_t)processor_start_thread;
 635                 thread->parameter = machine_param;
 636         }
 637         else {
 638                 thread = processor->next_thread;
 639                 processor->next_thread = THREAD_NULL;
 640         }
 641
 642         load_context(thread);
 643         /*NOTREACHED*/
 644 }
 645
 646 /*
 647  *      processor_start_thread:
 648  *
 649  *      First thread to execute on a started processor.
 650  *
 651  *      Called at splsched.
 652  */
 653 void
 654 processor_start_thread(void *machine_param)
 655 {
 656         processor_t             processor = current_processor();
 657         thread_t                self = current_thread();
 658
 659         slave_machine_init(machine_param);
 660
 661         /*
 662          *      If running the idle processor thread,
 663          *      reenter the idle loop, else terminate.
 664          */
 665         if (self == processor->idle_thread)
 666                 thread_block((thread_continue_t)idle_thread);
 667
 668         thread_terminate(self);
 669         /*NOTREACHED*/
 670 }
 671
 672 /*
 673  *      load_context:
 674  *
 675  *      Start the first thread on a processor.
 676  */
 677 static void
 678 load_context(
 679         thread_t                thread)
 680 {
 681         processor_t             processor = current_processor();
 682
 683
 684 #define load_context_kprintf(x...) /* kprintf("load_context: " x) */
 685
 686         load_context_kprintf("machine_set_current_thread\n");
 687         machine_set_current_thread(thread);
 688
 689         load_context_kprintf("processor_up\n");
 690         processor_up(processor);
 691
 692         PMAP_ACTIVATE_KERNEL(processor->cpu_id);
 693
 694         /*
 695          * Acquire a stack if none attached.  The panic
 696          * should never occur since the thread is expected
 697          * to have reserved stack.
 698          */
 699         load_context_kprintf("thread %p, stack %lx, stackptr %lx\n", thread,
 700                              thread->kernel_stack, thread->machine.kstackptr);
 701         if (!thread->kernel_stack) {
 702                 load_context_kprintf("stack_alloc_try\n");
 703                 if (!stack_alloc_try(thread))
 704                         panic("load_context");
 705         }
 706
 707         /*
 708          * The idle processor threads are not counted as
 709          * running for load calculations.
 710          */
 711         if (!(thread->state & TH_IDLE))
 712                 sched_run_incr(thread);
 713
 714         processor->active_thread = thread;
 715         processor->current_pri = thread->sched_pri;
 716         processor->current_thmode = thread->sched_mode;
 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