osfmk/kern/processor.c

   1 /*
   2  * Copyright (c) 2000-2007 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  */
  58
  59 /*
  60  *      processor.c: processor and processor_set manipulation routines.
  61  */
  62
  63 #include <mach/boolean.h>
  64 #include <mach/policy.h>
  65 #include <mach/processor.h>
  66 #include <mach/processor_info.h>
  67 #include <mach/vm_param.h>
  68 #include <kern/cpu_number.h>
  69 #include <kern/host.h>
  70 #include <kern/machine.h>
  71 #include <kern/misc_protos.h>
  72 #include <kern/processor.h>
  73 #include <kern/sched.h>
  74 #include <kern/task.h>
  75 #include <kern/thread.h>
  76 #include <kern/ipc_host.h>
  77 #include <kern/ipc_tt.h>
  78 #include <ipc/ipc_port.h>
  79 #include <kern/kalloc.h>
  80
  81 /*
  82  * Exported interface
  83  */
  84 #include <mach/mach_host_server.h>
  85 #include <mach/processor_set_server.h>
  86
  87 struct processor_set    pset0;
  88 struct pset_node                pset_node0;
  89 decl_simple_lock_data(static,pset_node_lock)
  90
  91 queue_head_t                    tasks;
  92 int                                             tasks_count;
  93 queue_head_t                    threads;
  94 int                                             threads_count;
  95 decl_mutex_data(,tasks_threads_lock)
  96
  97 processor_t                             processor_list;
  98 unsigned int                    processor_count;
  99 static processor_t              processor_list_tail;
 100 decl_simple_lock_data(,processor_list_lock)
 101
 102 uint32_t                                processor_avail_count;
 103
 104 processor_t     master_processor;
 105 int             master_cpu = 0;
 106
 107 /* Forwards */
 108 kern_return_t   processor_set_things(
 109                 processor_set_t         pset,
 110                 mach_port_t             **thing_list,
 111                 mach_msg_type_number_t  *count,
 112                 int                     type);
 113
 114 void
 115 processor_bootstrap(void)
 116 {
 117         pset_init(&pset0, &pset_node0);
 118         pset_node0.psets = &pset0;
 119
 120         simple_lock_init(&pset_node_lock, 0);
 121
 122         mutex_init(&tasks_threads_lock, 0);
 123         queue_init(&tasks);
 124         queue_init(&threads);
 125
 126         simple_lock_init(&processor_list_lock, 0);
 127
 128         master_processor = cpu_to_processor(master_cpu);
 129
 130         processor_init(master_processor, master_cpu, &pset0);
 131 }
 132
 133 /*
 134  *      Initialize the given processor for the cpu
 135  *      indicated by slot_num, and assign to the
 136  *      specified processor set.
 137  */
 138 void
 139 processor_init(
 140         processor_t             p,
 141         int                             slot_num,
 142         processor_set_t pset)
 143 {
 144         run_queue_init(&p->runq);
 145
 146         p->state = PROCESSOR_OFF_LINE;
 147         p->active_thread = p->next_thread = p->idle_thread = THREAD_NULL;
 148         p->processor_set = pset;
 149         p->current_pri = MINPRI;
 150         timer_call_setup(&p->quantum_timer, thread_quantum_expire, p);
 151         p->deadline = UINT64_MAX;
 152         p->timeslice = 0;
 153         p->processor_self = IP_NULL;
 154         simple_lock_init(&p->lock, 0);
 155         processor_data_init(p);
 156         PROCESSOR_DATA(p, slot_num) = slot_num;
 157         p->processor_list = NULL;
 158
 159         simple_lock(&processor_list_lock);
 160         if (processor_list == NULL)
 161                 processor_list = p;
 162         else
 163                 processor_list_tail->processor_list = p;
 164         processor_list_tail = p;
 165         processor_count++;
 166         simple_unlock(&processor_list_lock);
 167 }
 168
 169 processor_set_t
 170 processor_pset(
 171         processor_t     processor)
 172 {
 173         return (processor->processor_set);
 174 }
 175
 176 pset_node_t
 177 pset_node_root(void)
 178 {
 179         return &pset_node0;
 180 }
 181
 182 processor_set_t
 183 pset_create(
 184         pset_node_t                     node)
 185 {
 186         processor_set_t         *prev, pset = kalloc(sizeof (*pset));
 187
 188         if (pset != PROCESSOR_SET_NULL) {
 189                 pset_init(pset, node);
 190
 191                 simple_lock(&pset_node_lock);
 192
 193                 prev = &node->psets;
 194                 while (*prev != PROCESSOR_SET_NULL)
 195                         prev = &(*prev)->pset_list;
 196
 197                 *prev = pset;
 198
 199                 simple_unlock(&pset_node_lock);
 200         }
 201
 202         return (pset);
 203 }
 204
 205 /*
 206  *      Initialize the given processor_set structure.
 207  */
 208 void
 209 pset_init(
 210         processor_set_t         pset,
 211         pset_node_t                     node)
 212 {
 213         queue_init(&pset->active_queue);
 214         queue_init(&pset->idle_queue);
 215         pset->idle_count = 0;
 216         pset->processor_count = 0;
 217         pset->high_hint = PROCESSOR_NULL;
 218         pset->low_hint = PROCESSOR_NULL;
 219         pset_lock_init(pset);
 220         pset->pset_self = IP_NULL;
 221         pset->pset_name_self = IP_NULL;
 222         pset->pset_list = PROCESSOR_SET_NULL;
 223         pset->node = node;
 224 }
 225
 226 kern_return_t
 227 processor_info_count(
 228         processor_flavor_t              flavor,
 229         mach_msg_type_number_t  *count)
 230 {
 231         switch (flavor) {
 232
 233         case PROCESSOR_BASIC_INFO:
 234                 *count = PROCESSOR_BASIC_INFO_COUNT;
 235                 break;
 236
 237         case PROCESSOR_CPU_LOAD_INFO:
 238                 *count = PROCESSOR_CPU_LOAD_INFO_COUNT;
 239                 break;
 240
 241         default:
 242                 return (cpu_info_count(flavor, count));
 243         }
 244
 245         return (KERN_SUCCESS);
 246 }
 247
 248
 249 kern_return_t
 250 processor_info(
 251         register processor_t    processor,
 252         processor_flavor_t              flavor,
 253         host_t                                  *host,
 254         processor_info_t                info,
 255         mach_msg_type_number_t  *count)
 256 {
 257         register int    slot_num, state;
 258         kern_return_t   result;
 259
 260         if (processor == PROCESSOR_NULL)
 261                 return (KERN_INVALID_ARGUMENT);
 262
 263         slot_num = PROCESSOR_DATA(processor, slot_num);
 264
 265         switch (flavor) {
 266
 267         case PROCESSOR_BASIC_INFO:
 268         {
 269                 register processor_basic_info_t         basic_info;
 270
 271                 if (*count < PROCESSOR_BASIC_INFO_COUNT)
 272                         return (KERN_FAILURE);
 273
 274                 basic_info = (processor_basic_info_t) info;
 275                 basic_info->cpu_type = slot_type(slot_num);
 276                 basic_info->cpu_subtype = slot_subtype(slot_num);
 277                 state = processor->state;
 278                 if (state == PROCESSOR_OFF_LINE)
 279                         basic_info->running = FALSE;
 280                 else
 281                         basic_info->running = TRUE;
 282                 basic_info->slot_num = slot_num;
 283                 if (processor == master_processor)
 284                         basic_info->is_master = TRUE;
 285                 else
 286                         basic_info->is_master = FALSE;
 287
 288                 *count = PROCESSOR_BASIC_INFO_COUNT;
 289                 *host = &realhost;
 290
 291             return (KERN_SUCCESS);
 292         }
 293
 294         case PROCESSOR_CPU_LOAD_INFO:
 295         {
 296                 register processor_cpu_load_info_t      cpu_load_info;
 297
 298             if (*count < PROCESSOR_CPU_LOAD_INFO_COUNT)
 299                         return (KERN_FAILURE);
 300
 301             cpu_load_info = (processor_cpu_load_info_t) info;
 302                 cpu_load_info->cpu_ticks[CPU_STATE_USER] =
 303                                                         timer_grab(&PROCESSOR_DATA(processor, user_state)) / hz_tick_interval;
 304                 cpu_load_info->cpu_ticks[CPU_STATE_SYSTEM] =
 305                                                         timer_grab(&PROCESSOR_DATA(processor, system_state)) / hz_tick_interval;
 306                 cpu_load_info->cpu_ticks[CPU_STATE_IDLE] =
 307                                                         timer_grab(&PROCESSOR_DATA(processor, idle_state)) / hz_tick_interval;
 308                 cpu_load_info->cpu_ticks[CPU_STATE_NICE] = 0;
 309
 310             *count = PROCESSOR_CPU_LOAD_INFO_COUNT;
 311             *host = &realhost;
 312
 313             return (KERN_SUCCESS);
 314         }
 315
 316         default:
 317             result = cpu_info(flavor, slot_num, info, count);
 318             if (result == KERN_SUCCESS)
 319                         *host = &realhost;
 320
 321             return (result);
 322         }
 323 }
 324
 325 kern_return_t
 326 processor_start(
 327         processor_t                     processor)
 328 {
 329         processor_set_t         pset;
 330         thread_t                        thread;
 331         kern_return_t           result;
 332         spl_t                           s;
 333
 334         if (processor == PROCESSOR_NULL || processor->processor_set == PROCESSOR_SET_NULL)
 335                 return (KERN_INVALID_ARGUMENT);
 336
 337         if (processor == master_processor) {
 338                 processor_t             prev;
 339
 340                 prev = thread_bind(processor);
 341                 thread_block(THREAD_CONTINUE_NULL);
 342
 343                 result = cpu_start(PROCESSOR_DATA(processor, slot_num));
 344
 345                 thread_bind(prev);
 346
 347                 return (result);
 348         }
 349
 350         s = splsched();
 351         pset = processor->processor_set;
 352         pset_lock(pset);
 353         if (processor->state != PROCESSOR_OFF_LINE) {
 354                 pset_unlock(pset);
 355                 splx(s);
 356
 357                 return (KERN_FAILURE);
 358         }
 359
 360         processor->state = PROCESSOR_START;
 361         pset_unlock(pset);
 362         splx(s);
 363
 364         /*
 365          *      Create the idle processor thread.
 366          */
 367         if (processor->idle_thread == THREAD_NULL) {
 368                 result = idle_thread_create(processor);
 369                 if (result != KERN_SUCCESS) {
 370                         s = splsched();
 371                         pset_lock(pset);
 372                         processor->state = PROCESSOR_OFF_LINE;
 373                         pset_unlock(pset);
 374                         splx(s);
 375
 376                         return (result);
 377                 }
 378         }
 379
 380         /*
 381          *      If there is no active thread, the processor
 382          *      has never been started.  Create a dedicated
 383          *      start up thread.
 384          */
 385         if (    processor->active_thread == THREAD_NULL         &&
 386                         processor->next_thread == THREAD_NULL           ) {
 387                 result = kernel_thread_create((thread_continue_t)processor_start_thread, NULL, MAXPRI_KERNEL, &thread);
 388                 if (result != KERN_SUCCESS) {
 389                         s = splsched();
 390                         pset_lock(pset);
 391                         processor->state = PROCESSOR_OFF_LINE;
 392                         pset_unlock(pset);
 393                         splx(s);
 394
 395                         return (result);
 396                 }
 397
 398                 s = splsched();
 399                 thread_lock(thread);
 400                 thread->bound_processor = processor;
 401                 processor->next_thread = thread;
 402                 thread->state = TH_RUN;
 403                 thread_unlock(thread);
 404                 splx(s);
 405
 406                 thread_deallocate(thread);
 407         }
 408
 409         if (processor->processor_self == IP_NULL)
 410                 ipc_processor_init(processor);
 411
 412         result = cpu_start(PROCESSOR_DATA(processor, slot_num));
 413         if (result != KERN_SUCCESS) {
 414                 s = splsched();
 415                 pset_lock(pset);
 416                 processor->state = PROCESSOR_OFF_LINE;
 417                 timer_call_shutdown(processor);
 418                 pset_unlock(pset);
 419                 splx(s);
 420
 421                 return (result);
 422         }
 423
 424         ipc_processor_enable(processor);
 425
 426         return (KERN_SUCCESS);
 427 }
 428
 429 kern_return_t
 430 processor_exit(
 431         processor_t     processor)
 432 {
 433         if (processor == PROCESSOR_NULL)
 434                 return(KERN_INVALID_ARGUMENT);
 435
 436         return(processor_shutdown(processor));
 437 }
 438
 439 kern_return_t
 440 processor_control(
 441         processor_t             processor,
 442         processor_info_t        info,
 443         mach_msg_type_number_t  count)
 444 {
 445         if (processor == PROCESSOR_NULL)
 446                 return(KERN_INVALID_ARGUMENT);
 447
 448         return(cpu_control(PROCESSOR_DATA(processor, slot_num), info, count));
 449 }
 450
 451 kern_return_t
 452 processor_set_create(
 453         __unused host_t         host,
 454         __unused processor_set_t        *new_set,
 455         __unused processor_set_t        *new_name)
 456 {
 457         return(KERN_FAILURE);
 458 }
 459
 460 kern_return_t
 461 processor_set_destroy(
 462         __unused processor_set_t        pset)
 463 {
 464         return(KERN_FAILURE);
 465 }
 466
 467 kern_return_t
 468 processor_get_assignment(
 469         processor_t     processor,
 470         processor_set_t *pset)
 471 {
 472         int state;
 473
 474         state = processor->state;
 475         if (state == PROCESSOR_SHUTDOWN || state == PROCESSOR_OFF_LINE)
 476                 return(KERN_FAILURE);
 477
 478         *pset = &pset0;
 479
 480         return(KERN_SUCCESS);
 481 }
 482
 483 kern_return_t
 484 processor_set_info(
 485         processor_set_t         pset,
 486         int                     flavor,
 487         host_t                  *host,
 488         processor_set_info_t    info,
 489         mach_msg_type_number_t  *count)
 490 {
 491         if (pset == PROCESSOR_SET_NULL)
 492                 return(KERN_INVALID_ARGUMENT);
 493
 494         if (flavor == PROCESSOR_SET_BASIC_INFO) {
 495                 register processor_set_basic_info_t     basic_info;
 496
 497                 if (*count < PROCESSOR_SET_BASIC_INFO_COUNT)
 498                         return(KERN_FAILURE);
 499
 500                 basic_info = (processor_set_basic_info_t) info;
 501                 basic_info->processor_count = processor_avail_count;
 502                 basic_info->default_policy = POLICY_TIMESHARE;
 503
 504                 *count = PROCESSOR_SET_BASIC_INFO_COUNT;
 505                 *host = &realhost;
 506                 return(KERN_SUCCESS);
 507         }
 508         else if (flavor == PROCESSOR_SET_TIMESHARE_DEFAULT) {
 509                 register policy_timeshare_base_t        ts_base;
 510
 511                 if (*count < POLICY_TIMESHARE_BASE_COUNT)
 512                         return(KERN_FAILURE);
 513
 514                 ts_base = (policy_timeshare_base_t) info;
 515                 ts_base->base_priority = BASEPRI_DEFAULT;
 516
 517                 *count = POLICY_TIMESHARE_BASE_COUNT;
 518                 *host = &realhost;
 519                 return(KERN_SUCCESS);
 520         }
 521         else if (flavor == PROCESSOR_SET_FIFO_DEFAULT) {
 522                 register policy_fifo_base_t             fifo_base;
 523
 524                 if (*count < POLICY_FIFO_BASE_COUNT)
 525                         return(KERN_FAILURE);
 526
 527                 fifo_base = (policy_fifo_base_t) info;
 528                 fifo_base->base_priority = BASEPRI_DEFAULT;
 529
 530                 *count = POLICY_FIFO_BASE_COUNT;
 531                 *host = &realhost;
 532                 return(KERN_SUCCESS);
 533         }
 534         else if (flavor == PROCESSOR_SET_RR_DEFAULT) {
 535                 register policy_rr_base_t               rr_base;
 536
 537                 if (*count < POLICY_RR_BASE_COUNT)
 538                         return(KERN_FAILURE);
 539
 540                 rr_base = (policy_rr_base_t) info;
 541                 rr_base->base_priority = BASEPRI_DEFAULT;
 542                 rr_base->quantum = 1;
 543
 544                 *count = POLICY_RR_BASE_COUNT;
 545                 *host = &realhost;
 546                 return(KERN_SUCCESS);
 547         }
 548         else if (flavor == PROCESSOR_SET_TIMESHARE_LIMITS) {
 549                 register policy_timeshare_limit_t       ts_limit;
 550
 551                 if (*count < POLICY_TIMESHARE_LIMIT_COUNT)
 552                         return(KERN_FAILURE);
 553
 554                 ts_limit = (policy_timeshare_limit_t) info;
 555                 ts_limit->max_priority = MAXPRI_KERNEL;
 556
 557                 *count = POLICY_TIMESHARE_LIMIT_COUNT;
 558                 *host = &realhost;
 559                 return(KERN_SUCCESS);
 560         }
 561         else if (flavor == PROCESSOR_SET_FIFO_LIMITS) {
 562                 register policy_fifo_limit_t            fifo_limit;
 563
 564                 if (*count < POLICY_FIFO_LIMIT_COUNT)
 565                         return(KERN_FAILURE);
 566
 567                 fifo_limit = (policy_fifo_limit_t) info;
 568                 fifo_limit->max_priority = MAXPRI_KERNEL;
 569
 570                 *count = POLICY_FIFO_LIMIT_COUNT;
 571                 *host = &realhost;
 572                 return(KERN_SUCCESS);
 573         }
 574         else if (flavor == PROCESSOR_SET_RR_LIMITS) {
 575                 register policy_rr_limit_t              rr_limit;
 576
 577                 if (*count < POLICY_RR_LIMIT_COUNT)
 578                         return(KERN_FAILURE);
 579
 580                 rr_limit = (policy_rr_limit_t) info;
 581                 rr_limit->max_priority = MAXPRI_KERNEL;
 582
 583                 *count = POLICY_RR_LIMIT_COUNT;
 584                 *host = &realhost;
 585                 return(KERN_SUCCESS);
 586         }
 587         else if (flavor == PROCESSOR_SET_ENABLED_POLICIES) {
 588                 register int                            *enabled;
 589
 590                 if (*count < (sizeof(*enabled)/sizeof(int)))
 591                         return(KERN_FAILURE);
 592
 593                 enabled = (int *) info;
 594                 *enabled = POLICY_TIMESHARE | POLICY_RR | POLICY_FIFO;
 595
 596                 *count = sizeof(*enabled)/sizeof(int);
 597                 *host = &realhost;
 598                 return(KERN_SUCCESS);
 599         }
 600
 601
 602         *host = HOST_NULL;
 603         return(KERN_INVALID_ARGUMENT);
 604 }
 605
 606 /*
 607  *      processor_set_statistics
 608  *
 609  *      Returns scheduling statistics for a processor set.
 610  */
 611 kern_return_t
 612 processor_set_statistics(
 613         processor_set_t         pset,
 614         int                     flavor,
 615         processor_set_info_t    info,
 616         mach_msg_type_number_t  *count)
 617 {
 618         if (pset == PROCESSOR_SET_NULL || pset != &pset0)
 619                 return (KERN_INVALID_PROCESSOR_SET);
 620
 621         if (flavor == PROCESSOR_SET_LOAD_INFO) {
 622                 register processor_set_load_info_t     load_info;
 623
 624                 if (*count < PROCESSOR_SET_LOAD_INFO_COUNT)
 625                         return(KERN_FAILURE);
 626
 627                 load_info = (processor_set_load_info_t) info;
 628
 629                 load_info->mach_factor = sched_mach_factor;
 630                 load_info->load_average = sched_load_average;
 631
 632                 load_info->task_count = tasks_count;
 633                 load_info->thread_count = threads_count;
 634
 635                 *count = PROCESSOR_SET_LOAD_INFO_COUNT;
 636                 return(KERN_SUCCESS);
 637         }
 638
 639         return(KERN_INVALID_ARGUMENT);
 640 }
 641
 642 /*
 643  *      processor_set_max_priority:
 644  *
 645  *      Specify max priority permitted on processor set.  This affects
 646  *      newly created and assigned threads.  Optionally change existing
 647  *      ones.
 648  */
 649 kern_return_t
 650 processor_set_max_priority(
 651         __unused processor_set_t        pset,
 652         __unused int                    max_priority,
 653         __unused boolean_t              change_threads)
 654 {
 655         return (KERN_INVALID_ARGUMENT);
 656 }
 657
 658 /*
 659  *      processor_set_policy_enable:
 660  *
 661  *      Allow indicated policy on processor set.
 662  */
 663
 664 kern_return_t
 665 processor_set_policy_enable(
 666         __unused processor_set_t        pset,
 667         __unused int                    policy)
 668 {
 669         return (KERN_INVALID_ARGUMENT);
 670 }
 671
 672 /*
 673  *      processor_set_policy_disable:
 674  *
 675  *      Forbid indicated policy on processor set.  Time sharing cannot
 676  *      be forbidden.
 677  */
 678 kern_return_t
 679 processor_set_policy_disable(
 680         __unused processor_set_t        pset,
 681         __unused int                    policy,
 682         __unused boolean_t              change_threads)
 683 {
 684         return (KERN_INVALID_ARGUMENT);
 685 }
 686
 687 #define THING_TASK      0
 688 #define THING_THREAD    1
 689
 690 /*
 691  *      processor_set_things:
 692  *
 693  *      Common internals for processor_set_{threads,tasks}
 694  */
 695 kern_return_t
 696 processor_set_things(
 697         processor_set_t                 pset,
 698         mach_port_t                             **thing_list,
 699         mach_msg_type_number_t  *count,
 700         int                                             type)
 701 {
 702         unsigned int actual;    /* this many things */
 703         unsigned int maxthings;
 704         unsigned int i;
 705
 706         vm_size_t size, size_needed;
 707         void  *addr;
 708
 709         if (pset == PROCESSOR_SET_NULL || pset != &pset0)
 710                 return (KERN_INVALID_ARGUMENT);
 711
 712         size = 0;
 713         addr = NULL;
 714
 715         for (;;) {
 716                 mutex_lock(&tasks_threads_lock);
 717
 718                 if (type == THING_TASK)
 719                         maxthings = tasks_count;
 720                 else
 721                         maxthings = threads_count;
 722
 723                 /* do we have the memory we need? */
 724
 725                 size_needed = maxthings * sizeof (mach_port_t);
 726                 if (size_needed <= size)
 727                         break;
 728
 729                 /* unlock and allocate more memory */
 730                 mutex_unlock(&tasks_threads_lock);
 731
 732                 if (size != 0)
 733                         kfree(addr, size);
 734
 735                 assert(size_needed > 0);
 736                 size = size_needed;
 737
 738                 addr = kalloc(size);
 739                 if (addr == 0)
 740                         return (KERN_RESOURCE_SHORTAGE);
 741         }
 742
 743         /* OK, have memory and the list locked */
 744
 745         actual = 0;
 746         switch (type) {
 747
 748         case THING_TASK: {
 749                 task_t          task, *task_list = (task_t *)addr;
 750
 751                 for (task = (task_t)queue_first(&tasks);
 752                                                 !queue_end(&tasks, (queue_entry_t)task);
 753                                                                 task = (task_t)queue_next(&task->tasks)) {
 754 #if defined(SECURE_KERNEL)
 755                         if (task != kernel_task) {
 756 #endif
 757                                 task_reference_internal(task);
 758                                 task_list[actual++] = task;
 759 #if defined(SECURE_KERNEL)
 760                         }
 761 #endif
 762                 }
 763
 764                 break;
 765         }
 766
 767         case THING_THREAD: {
 768                 thread_t        thread, *thread_list = (thread_t *)addr;
 769
 770                 for (thread = (thread_t)queue_first(&threads);
 771                                                 !queue_end(&threads, (queue_entry_t)thread);
 772                                                                 thread = (thread_t)queue_next(&thread->threads)) {
 773                         thread_reference_internal(thread);
 774                         thread_list[actual++] = thread;
 775                 }
 776
 777                 break;
 778         }
 779
 780         }
 781
 782         mutex_unlock(&tasks_threads_lock);
 783
 784         if (actual < maxthings)
 785                 size_needed = actual * sizeof (mach_port_t);
 786
 787         if (actual == 0) {
 788                 /* no things, so return null pointer and deallocate memory */
 789                 *thing_list = NULL;
 790                 *count = 0;
 791
 792                 if (size != 0)
 793                         kfree(addr, size);
 794         }
 795         else {
 796                 /* if we allocated too much, must copy */
 797
 798                 if (size_needed < size) {
 799                         void *newaddr;
 800
 801                         newaddr = kalloc(size_needed);
 802                         if (newaddr == 0) {
 803                                 switch (type) {
 804
 805                                 case THING_TASK: {
 806                                         task_t          *task_list = (task_t *)addr;
 807
 808                                         for (i = 0; i < actual; i++)
 809                                                 task_deallocate(task_list[i]);
 810                                         break;
 811                                 }
 812
 813                                 case THING_THREAD: {
 814                                         thread_t        *thread_list = (thread_t *)addr;
 815
 816                                         for (i = 0; i < actual; i++)
 817                                                 thread_deallocate(thread_list[i]);
 818                                         break;
 819                                 }
 820
 821                                 }
 822
 823                                 kfree(addr, size);
 824                                 return (KERN_RESOURCE_SHORTAGE);
 825                         }
 826
 827                         bcopy((void *) addr, (void *) newaddr, size_needed);
 828                         kfree(addr, size);
 829                         addr = newaddr;
 830                 }
 831
 832                 *thing_list = (mach_port_t *)addr;
 833                 *count = actual;
 834
 835                 /* do the conversion that Mig should handle */
 836
 837                 switch (type) {
 838
 839                 case THING_TASK: {
 840                         task_t          *task_list = (task_t *)addr;
 841
 842                         for (i = 0; i < actual; i++)
 843                                 (*thing_list)[i] = convert_task_to_port(task_list[i]);
 844                         break;
 845                 }
 846
 847                 case THING_THREAD: {
 848                         thread_t        *thread_list = (thread_t *)addr;
 849
 850                         for (i = 0; i < actual; i++)
 851                                 (*thing_list)[i] = convert_thread_to_port(thread_list[i]);
 852                         break;
 853                 }
 854
 855                 }
 856         }
 857
 858         return (KERN_SUCCESS);
 859 }
 860
 861
 862 /*
 863  *      processor_set_tasks:
 864  *
 865  *      List all tasks in the processor set.
 866  */
 867 kern_return_t
 868 processor_set_tasks(
 869         processor_set_t         pset,
 870         task_array_t            *task_list,
 871         mach_msg_type_number_t  *count)
 872 {
 873     return(processor_set_things(pset, (mach_port_t **)task_list, count, THING_TASK));
 874 }
 875
 876 /*
 877  *      processor_set_threads:
 878  *
 879  *      List all threads in the processor set.
 880  */
 881 #if defined(SECURE_KERNEL)
 882 kern_return_t
 883 processor_set_threads(
 884         __unused processor_set_t                pset,
 885         __unused thread_array_t         *thread_list,
 886         __unused mach_msg_type_number_t *count)
 887 {
 888     return KERN_FAILURE;
 889 }
 890 #else
 891 kern_return_t
 892 processor_set_threads(
 893         processor_set_t         pset,
 894         thread_array_t          *thread_list,
 895         mach_msg_type_number_t  *count)
 896 {
 897     return(processor_set_things(pset, (mach_port_t **)thread_list, count, THING_THREAD));
 898 }
 899 #endif
 900
 901 /*
 902  *      processor_set_policy_control
 903  *
 904  *      Controls the scheduling attributes governing the processor set.
 905  *      Allows control of enabled policies, and per-policy base and limit
 906  *      priorities.
 907  */
 908 kern_return_t
 909 processor_set_policy_control(
 910         __unused processor_set_t                pset,
 911         __unused int                            flavor,
 912         __unused processor_set_info_t   policy_info,
 913         __unused mach_msg_type_number_t count,
 914         __unused boolean_t                      change)
 915 {
 916         return (KERN_INVALID_ARGUMENT);
 917 }
 918
 919 #undef pset_deallocate
 920 void pset_deallocate(processor_set_t pset);
 921 void
 922 pset_deallocate(
 923 __unused processor_set_t        pset)
 924 {
 925         return;
 926 }
 927
 928 #undef pset_reference
 929 void pset_reference(processor_set_t pset);
 930 void
 931 pset_reference(
 932 __unused processor_set_t        pset)
 933 {
 934         return;
 935 }