osfmk/kern/machine.c

   1 /*
   2  * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * @OSF_COPYRIGHT@
  24  */
  25 /*
  26  * Mach Operating System
  27  * Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
  28  * All Rights Reserved.
  29  *
  30  * Permission to use, copy, modify and distribute this software and its
  31  * documentation is hereby granted, provided that both the copyright
  32  * notice and this permission notice appear in all copies of the
  33  * software, derivative works or modified versions, and any portions
  34  * thereof, and that both notices appear in supporting documentation.
  35  *
  36  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  37  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  38  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  39  *
  40  * Carnegie Mellon requests users of this software to return to
  41  *
  42  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  43  *  School of Computer Science
  44  *  Carnegie Mellon University
  45  *  Pittsburgh PA 15213-3890
  46  *
  47  * any improvements or extensions that they make and grant Carnegie Mellon
  48  * the rights to redistribute these changes.
  49  */
  50 /*
  51  */
  52 /*
  53  *      File:   kern/machine.c
  54  *      Author: Avadis Tevanian, Jr.
  55  *      Date:   1987
  56  *
  57  *      Support for machine independent machine abstraction.
  58  */
  59
  60 #include <string.h>
  61
  62 #include <mach/mach_types.h>
  63 #include <mach/boolean.h>
  64 #include <mach/kern_return.h>
  65 #include <mach/machine.h>
  66 #include <mach/host_info.h>
  67 #include <mach/host_reboot.h>
  68 #include <mach/host_priv_server.h>
  69 #include <mach/processor_server.h>
  70
  71 #include <kern/kern_types.h>
  72 #include <kern/counters.h>
  73 #include <kern/cpu_data.h>
  74 #include <kern/ipc_host.h>
  75 #include <kern/host.h>
  76 #include <kern/lock.h>
  77 #include <kern/machine.h>
  78 #include <kern/misc_protos.h>
  79 #include <kern/processor.h>
  80 #include <kern/queue.h>
  81 #include <kern/sched.h>
  82 #include <kern/task.h>
  83 #include <kern/thread.h>
  84
  85 #include <IOKit/IOHibernatePrivate.h>
  86 #include <IOKit/IOPlatformExpert.h>
  87
  88 /*
  89  *      Exported variables:
  90  */
  91
  92 struct machine_info     machine_info;
  93
  94 /* Forwards */
  95 void                    processor_doshutdown(
  96                                         processor_t                     processor);
  97
  98 /*
  99  *      processor_up:
 100  *
 101  *      Flag processor as up and running, and available
 102  *      for scheduling.
 103  */
 104 void
 105 processor_up(
 106         processor_t             processor)
 107 {
 108         processor_set_t         pset = &default_pset;
 109         spl_t                           s;
 110
 111         s = splsched();
 112         processor_lock(processor);
 113         init_ast_check(processor);
 114         simple_lock(&pset->sched_lock);
 115         pset_add_processor(pset, processor);
 116         enqueue_tail(&pset->active_queue, (queue_entry_t)processor);
 117         processor->state = PROCESSOR_RUNNING;
 118         simple_unlock(&pset->sched_lock);
 119         hw_atomic_add(&machine_info.avail_cpus, 1);
 120         ml_cpu_up();
 121         processor_unlock(processor);
 122         splx(s);
 123 }
 124
 125 kern_return_t
 126 host_reboot(
 127         host_priv_t             host_priv,
 128         int                             options)
 129 {
 130         if (host_priv == HOST_PRIV_NULL)
 131                 return (KERN_INVALID_HOST);
 132
 133         assert(host_priv == &realhost);
 134
 135         if (options & HOST_REBOOT_DEBUGGER) {
 136                 Debugger("Debugger");
 137                 return (KERN_SUCCESS);
 138         }
 139
 140     if (options & HOST_REBOOT_UPSDELAY) {
 141         // UPS power cutoff path
 142         PEHaltRestart( kPEUPSDelayHaltCPU );
 143     } else {
 144        halt_all_cpus(!(options & HOST_REBOOT_HALT));
 145     }
 146
 147         return (KERN_SUCCESS);
 148 }
 149
 150 kern_return_t
 151 processor_assign(
 152         __unused processor_t            processor,
 153         __unused processor_set_t        new_pset,
 154         __unused boolean_t              wait)
 155 {
 156         return (KERN_FAILURE);
 157 }
 158
 159 kern_return_t
 160 processor_shutdown(
 161         processor_t                     processor)
 162 {
 163         processor_set_t         pset;
 164         spl_t                           s;
 165
 166         s = splsched();
 167         processor_lock(processor);
 168         if (processor->state == PROCESSOR_OFF_LINE) {
 169                 /*
 170                  * Success if already shutdown.
 171                  */
 172                 processor_unlock(processor);
 173                 splx(s);
 174
 175                 return (KERN_SUCCESS);
 176         }
 177
 178         if (processor->state == PROCESSOR_START) {
 179                 /*
 180                  * Failure if currently being started.
 181                  */
 182                 processor_unlock(processor);
 183                 splx(s);
 184
 185                 return (KERN_FAILURE);
 186         }
 187
 188         /*
 189          * Must lock the scheduling lock
 190          * to get at the processor state.
 191          */
 192         pset = processor->processor_set;
 193         if (pset != PROCESSOR_SET_NULL) {
 194                 simple_lock(&pset->sched_lock);
 195
 196                 /*
 197                  * If the processor is dispatching, let it finish.
 198                  */
 199                 while (processor->state == PROCESSOR_DISPATCHING) {
 200                         simple_unlock(&pset->sched_lock);
 201                         delay(1);
 202                         simple_lock(&pset->sched_lock);
 203                 }
 204
 205                 /*
 206                  * Success if already being shutdown.
 207                  */
 208                 if (processor->state == PROCESSOR_SHUTDOWN) {
 209                         simple_unlock(&pset->sched_lock);
 210                         processor_unlock(processor);
 211                         splx(s);
 212
 213                         return (KERN_SUCCESS);
 214                 }
 215         }
 216         else {
 217                 /*
 218                  * Success, already being shutdown.
 219                  */
 220                 processor_unlock(processor);
 221                 splx(s);
 222
 223                 return (KERN_SUCCESS);
 224         }
 225
 226         if (processor->state == PROCESSOR_IDLE) {
 227                 remqueue(&pset->idle_queue, (queue_entry_t)processor);
 228                 pset->idle_count--;
 229         }
 230         else
 231         if (processor->state == PROCESSOR_RUNNING)
 232                 remqueue(&pset->active_queue, (queue_entry_t)processor);
 233         else
 234                 panic("processor_shutdown");
 235
 236         processor->state = PROCESSOR_SHUTDOWN;
 237
 238         simple_unlock(&pset->sched_lock);
 239
 240         processor_unlock(processor);
 241
 242         processor_doshutdown(processor);
 243         splx(s);
 244
 245         cpu_exit_wait(PROCESSOR_DATA(processor, slot_num));
 246
 247         return (KERN_SUCCESS);
 248 }
 249
 250 /*
 251  * Called at splsched.
 252  */
 253 void
 254 processor_doshutdown(
 255         processor_t                     processor)
 256 {
 257         thread_t                        old_thread, self = current_thread();
 258         processor_set_t         pset;
 259         processor_t                     prev;
 260         int                                     pcount;
 261
 262         /*
 263          *      Get onto the processor to shutdown
 264          */
 265         prev = thread_bind(self, processor);
 266         thread_block(THREAD_CONTINUE_NULL);
 267
 268         processor_lock(processor);
 269         pset = processor->processor_set;
 270         simple_lock(&pset->sched_lock);
 271
 272         if ((pcount = pset->processor_count) == 1) {
 273                 simple_unlock(&pset->sched_lock);
 274                 processor_unlock(processor);
 275
 276                 hibernate_vm_lock();
 277
 278                 processor_lock(processor);
 279                 simple_lock(&pset->sched_lock);
 280         }
 281
 282         assert(processor->state == PROCESSOR_SHUTDOWN);
 283
 284         pset_remove_processor(pset, processor);
 285         simple_unlock(&pset->sched_lock);
 286         processor_unlock(processor);
 287
 288         if (pcount == 1)
 289                 hibernate_vm_unlock();
 290
 291         /*
 292          *      Continue processor shutdown in shutdown context.
 293          */
 294         thread_bind(self, prev);
 295         old_thread = machine_processor_shutdown(self, processor_offline, processor);
 296
 297         thread_begin(self, self->last_processor);
 298
 299         thread_dispatch(old_thread);
 300
 301         /*
 302          * If we just shutdown another processor, move the
 303          * timer call outs to the current processor.
 304          */
 305         if (processor != current_processor()) {
 306                 processor_lock(processor);
 307                 if (    processor->state == PROCESSOR_OFF_LINE  ||
 308                                 processor->state == PROCESSOR_SHUTDOWN  )
 309                         timer_call_shutdown(processor);
 310                 processor_unlock(processor);
 311         }
 312 }
 313
 314 /*
 315  *      Complete the shutdown and place the processor offline.
 316  *
 317  *      Called at splsched in the shutdown context.
 318  */
 319 void
 320 processor_offline(
 321         processor_t             processor)
 322 {
 323         thread_t                thread, old_thread = processor->active_thread;
 324
 325         thread = processor->idle_thread;
 326         processor->active_thread = thread;
 327         processor->current_pri = IDLEPRI;
 328
 329         processor->last_dispatch = mach_absolute_time();
 330         timer_switch((uint32_t)processor->last_dispatch,
 331                                                         &PROCESSOR_DATA(processor, offline_timer));
 332
 333         thread_done(old_thread, thread, processor);
 334
 335         machine_set_current_thread(thread);
 336
 337         thread_begin(thread, processor);
 338
 339         thread_dispatch(old_thread);
 340
 341         PMAP_DEACTIVATE_KERNEL(PROCESSOR_DATA(processor, slot_num));
 342
 343         processor_lock(processor);
 344         processor->state = PROCESSOR_OFF_LINE;
 345         hw_atomic_sub(&machine_info.avail_cpus, 1);
 346         ml_cpu_down();
 347         processor_unlock(processor);
 348
 349         cpu_sleep();
 350         panic("zombie processor");
 351         /*NOTREACHED*/
 352 }
 353
 354 kern_return_t
 355 host_get_boot_info(
 356         host_priv_t         host_priv,
 357         kernel_boot_info_t  boot_info)
 358 {
 359         const char *src = "";
 360         if (host_priv == HOST_PRIV_NULL)
 361                 return (KERN_INVALID_HOST);
 362
 363         assert(host_priv == &realhost);
 364
 365         /*
 366          * Copy first operator string terminated by '\0' followed by
 367          *      standardized strings generated from boot string.
 368          */
 369         src = machine_boot_info(boot_info, KERNEL_BOOT_INFO_MAX);
 370         if (src != boot_info)
 371                 (void) strncpy(boot_info, src, KERNEL_BOOT_INFO_MAX);
 372
 373         return (KERN_SUCCESS);
 374 }