osfmk/i386/acpi.c

   1 /*
   2  * Copyright (c) 2000-2012 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 #include <i386/pmap.h>
  30 #include <i386/proc_reg.h>
  31 #include <i386/mp_desc.h>
  32 #include <i386/misc_protos.h>
  33 #include <i386/mp.h>
  34 #include <i386/cpu_data.h>
  35 #if CONFIG_MTRR
  36 #include <i386/mtrr.h>
  37 #endif
  38 #if HYPERVISOR
  39 #include <kern/hv_support.h>
  40 #endif
  41 #if CONFIG_VMX
  42 #include <i386/vmx/vmx_cpu.h>
  43 #endif
  44 #include <i386/ucode.h>
  45 #include <i386/acpi.h>
  46 #include <i386/fpu.h>
  47 #include <i386/lapic.h>
  48 #include <i386/mp.h>
  49 #include <i386/mp_desc.h>
  50 #include <i386/serial_io.h>
  51 #if CONFIG_MCA
  52 #include <i386/machine_check.h>
  53 #endif
  54 #include <i386/pmCPU.h>
  55
  56 #include <i386/tsc.h>
  57
  58 #include <kern/cpu_data.h>
  59 #include <kern/machine.h>
  60 #include <kern/timer_queue.h>
  61 #include <console/serial_protos.h>
  62 #include <machine/pal_routines.h>
  63 #include <vm/vm_page.h>
  64
  65 #if HIBERNATION
  66 #include <IOKit/IOHibernatePrivate.h>
  67 #endif
  68 #include <IOKit/IOPlatformExpert.h>
  69 #include <sys/kdebug.h>
  70
  71 #if MONOTONIC
  72 #include <kern/monotonic.h>
  73 #endif /* MONOTONIC */
  74
  75 #if CONFIG_SLEEP
  76 extern void     acpi_sleep_cpu(acpi_sleep_callback, void * refcon);
  77 extern void     acpi_wake_prot(void);
  78 #endif
  79 extern kern_return_t IOCPURunPlatformQuiesceActions(void);
  80 extern kern_return_t IOCPURunPlatformActiveActions(void);
  81 extern kern_return_t IOCPURunPlatformHaltRestartActions(uint32_t message);
  82
  83 extern void     fpinit(void);
  84
  85 vm_offset_t
  86 acpi_install_wake_handler(void)
  87 {
  88 #if CONFIG_SLEEP
  89         install_real_mode_bootstrap(acpi_wake_prot);
  90         return REAL_MODE_BOOTSTRAP_OFFSET;
  91 #else
  92         return 0;
  93 #endif
  94 }
  95
  96 #if CONFIG_SLEEP
  97
  98 unsigned int            save_kdebug_enable = 0;
  99 static uint64_t         acpi_sleep_abstime;
 100 static uint64_t         acpi_idle_abstime;
 101 static uint64_t         acpi_wake_abstime, acpi_wake_postrebase_abstime;
 102 boolean_t               deep_idle_rebase = TRUE;
 103
 104 #if HIBERNATION
 105 struct acpi_hibernate_callback_data {
 106         acpi_sleep_callback func;
 107         void *refcon;
 108 };
 109 typedef struct acpi_hibernate_callback_data acpi_hibernate_callback_data_t;
 110
 111 static void
 112 acpi_hibernate(void *refcon)
 113 {
 114         uint32_t mode;
 115
 116         acpi_hibernate_callback_data_t *data =
 117                 (acpi_hibernate_callback_data_t *)refcon;
 118
 119         if (current_cpu_datap()->cpu_hibernate)
 120         {
 121                 mode = hibernate_write_image();
 122
 123                 if( mode == kIOHibernatePostWriteHalt )
 124                 {
 125                         // off
 126                         HIBLOG("power off\n");
 127                         IOCPURunPlatformHaltRestartActions(kPEHaltCPU);
 128                         if (PE_halt_restart) (*PE_halt_restart)(kPEHaltCPU);
 129                 }
 130                 else if( mode == kIOHibernatePostWriteRestart )
 131                 {
 132                         // restart
 133                         HIBLOG("restart\n");
 134                         IOCPURunPlatformHaltRestartActions(kPERestartCPU);
 135                         if (PE_halt_restart) (*PE_halt_restart)(kPERestartCPU);
 136                 }
 137                 else
 138                 {
 139                         // sleep
 140                         HIBLOG("sleep\n");
 141
 142                         // should we come back via regular wake, set the state in memory.
 143                         cpu_datap(0)->cpu_hibernate = 0;
 144                 }
 145
 146         }
 147
 148 #if CONFIG_VMX
 149         vmx_suspend();
 150 #endif
 151         kdebug_enable = 0;
 152
 153         IOCPURunPlatformQuiesceActions();
 154
 155         acpi_sleep_abstime = mach_absolute_time();
 156
 157         (data->func)(data->refcon);
 158
 159         /* should never get here! */
 160 }
 161 #endif /* HIBERNATION */
 162 #endif /* CONFIG_SLEEP */
 163
 164 extern void                     slave_pstart(void);
 165 extern void                     hibernate_rebuild_vm_structs(void);
 166
 167 extern  unsigned int            wake_nkdbufs;
 168
 169 void
 170 acpi_sleep_kernel(acpi_sleep_callback func, void *refcon)
 171 {
 172 #if HIBERNATION
 173         acpi_hibernate_callback_data_t data;
 174 #endif
 175         boolean_t did_hibernate;
 176         cpu_data_t *cdp = current_cpu_datap();
 177         unsigned int    cpu;
 178         kern_return_t   rc;
 179         unsigned int    my_cpu;
 180         uint64_t        start;
 181         uint64_t        elapsed = 0;
 182         uint64_t        elapsed_trace_start = 0;
 183
 184         my_cpu = cpu_number();
 185         kprintf("acpi_sleep_kernel hib=%d, cpu=%d\n", cdp->cpu_hibernate,
 186                         my_cpu);
 187
 188         /* Get all CPUs to be in the "off" state */
 189         for (cpu = 0; cpu < real_ncpus; cpu += 1) {
 190                 if (cpu == my_cpu)
 191                         continue;
 192                 rc = pmCPUExitHaltToOff(cpu);
 193                 if (rc != KERN_SUCCESS)
 194                         panic("Error %d trying to transition CPU %d to OFF",
 195                               rc, cpu);
 196         }
 197
 198         /* shutdown local APIC before passing control to firmware */
 199         lapic_shutdown();
 200
 201 #if HIBERNATION
 202         data.func = func;
 203         data.refcon = refcon;
 204 #endif
 205
 206 #if MONOTONIC
 207         mt_cpu_down(cdp);
 208 #endif /* MONOTONIC */
 209
 210         /* Save power management timer state */
 211         pmTimerSave();
 212
 213 #if HYPERVISOR
 214         /* Notify hypervisor that we are about to sleep */
 215         hv_suspend();
 216 #endif
 217
 218         /*
 219          * Enable FPU/SIMD unit for potential hibernate acceleration
 220          */
 221         clear_ts();
 222
 223         KDBG(IOKDBG_CODE(DBG_HIBERNATE, 0) | DBG_FUNC_START);
 224
 225         save_kdebug_enable = kdebug_enable;
 226         kdebug_enable = 0;
 227
 228         acpi_sleep_abstime = mach_absolute_time();
 229
 230 #if CONFIG_SLEEP
 231         /*
 232          * Save master CPU state and sleep platform.
 233          * Will not return until platform is woken up,
 234          * or if sleep failed.
 235          */
 236         uint64_t old_cr3 = x86_64_pre_sleep();
 237 #if HIBERNATION
 238         acpi_sleep_cpu(acpi_hibernate, &data);
 239 #else
 240 #if CONFIG_VMX
 241         vmx_suspend();
 242 #endif
 243         acpi_sleep_cpu(func, refcon);
 244 #endif
 245
 246         acpi_wake_abstime = mach_absolute_time();
 247         /* Rebase TSC->absolute time conversion, using timestamp
 248          * recorded before sleep.
 249          */
 250         rtc_nanotime_init(acpi_sleep_abstime);
 251         acpi_wake_postrebase_abstime = start = mach_absolute_time();
 252         assert(start >= acpi_sleep_abstime);
 253
 254         x86_64_post_sleep(old_cr3);
 255
 256 #endif /* CONFIG_SLEEP */
 257
 258         /* Reset UART if kprintf is enabled.
 259          * However kprintf should not be used before rtc_sleep_wakeup()
 260          * for compatibility with firewire kprintf.
 261          */
 262
 263         if (FALSE == disable_serial_output)
 264                 pal_serial_init();
 265
 266 #if HIBERNATION
 267         if (current_cpu_datap()->cpu_hibernate) {
 268                 did_hibernate = TRUE;
 269
 270         } else
 271 #endif
 272         {
 273                 did_hibernate = FALSE;
 274         }
 275
 276         /* Re-enable fast syscall */
 277         cpu_syscall_init(current_cpu_datap());
 278
 279 #if CONFIG_MCA
 280         /* Re-enable machine check handling */
 281         mca_cpu_init();
 282 #endif
 283
 284 #if CONFIG_MTRR
 285         /* restore MTRR settings */
 286         mtrr_update_cpu();
 287 #endif
 288
 289         /* update CPU microcode */
 290         ucode_update_wake();
 291
 292 #if CONFIG_MTRR
 293         /* set up PAT following boot processor power up */
 294         pat_init();
 295 #endif
 296
 297 #if CONFIG_VMX
 298         /*
 299          * Restore VT mode
 300          */
 301         vmx_resume(did_hibernate);
 302 #endif
 303
 304         /*
 305          * Go through all of the CPUs and mark them as requiring
 306          * a full restart.
 307          */
 308         pmMarkAllCPUsOff();
 309
 310
 311         /* re-enable and re-init local apic (prior to starting timers) */
 312         if (lapic_probe())
 313                 lapic_configure();
 314
 315 #if KASAN
 316         /*
 317          * The sleep implementation uses indirect noreturn calls, so we miss stack
 318          * unpoisoning. Do it explicitly.
 319          */
 320         __asan_handle_no_return();
 321 #endif
 322
 323 #if HIBERNATION
 324         hibernate_rebuild_vm_structs();
 325 #endif
 326
 327         elapsed += mach_absolute_time() - start;
 328
 329         rtc_decrementer_configure();
 330         kdebug_enable = save_kdebug_enable;
 331
 332         if (kdebug_enable == 0) {
 333                 if (wake_nkdbufs) {
 334                         start = mach_absolute_time();
 335                         kdebug_trace_start(wake_nkdbufs, NULL, TRUE);
 336                         elapsed_trace_start += mach_absolute_time() - start;
 337                 }
 338         }
 339         start = mach_absolute_time();
 340
 341         /* Reconfigure FP/SIMD unit */
 342         init_fpu();
 343         clear_ts();
 344
 345         IOCPURunPlatformActiveActions();
 346
 347 #if HIBERNATION
 348         if (did_hibernate) {
 349                 KDBG(IOKDBG_CODE(DBG_HIBERNATE, 2) | DBG_FUNC_START);
 350                 hibernate_machine_init();
 351                 KDBG(IOKDBG_CODE(DBG_HIBERNATE, 2) | DBG_FUNC_END);
 352
 353                 current_cpu_datap()->cpu_hibernate = 0;
 354         }
 355 #endif /* HIBERNATION */
 356
 357         KDBG(IOKDBG_CODE(DBG_HIBERNATE, 0) | DBG_FUNC_END, start, elapsed,
 358                         elapsed_trace_start, acpi_wake_abstime);
 359
 360         /* Restore power management register state */
 361         pmCPUMarkRunning(current_cpu_datap());
 362
 363         /* Restore power management timer state */
 364         pmTimerRestore();
 365
 366         /* Restart timer interrupts */
 367         rtc_timer_start();
 368
 369 #if HIBERNATION
 370
 371         kprintf("ret from acpi_sleep_cpu hib=%d\n", did_hibernate);
 372 #endif
 373
 374 #if CONFIG_SLEEP
 375         /* Becase we don't save the bootstrap page, and we share it
 376          * between sleep and mp slave init, we need to recreate it
 377          * after coming back from sleep or hibernate */
 378         install_real_mode_bootstrap(slave_pstart);
 379 #endif
 380 }
 381
 382 /*
 383  * acpi_idle_kernel is called by the ACPI Platform kext to request the kernel
 384  * to idle the boot processor in the deepest C-state for S0 sleep. All slave
 385  * processors are expected already to have been offlined in the deepest C-state.
 386  *
 387  * The contract with ACPI is that although the kernel is called with interrupts
 388  * disabled, interrupts may need to be re-enabled to dismiss any pending timer
 389  * interrupt. However, the callback function will be called once this has
 390  * occurred and interrupts are guaranteed to be disabled at that time,
 391  * and to remain disabled during C-state entry, exit (wake) and return
 392  * from acpi_idle_kernel.
 393  */
 394 void
 395 acpi_idle_kernel(acpi_sleep_callback func, void *refcon)
 396 {
 397         boolean_t       istate = ml_get_interrupts_enabled();
 398
 399         kprintf("acpi_idle_kernel, cpu=%d, interrupts %s\n",
 400                 cpu_number(), istate ? "enabled" : "disabled");
 401
 402         assert(cpu_number() == master_cpu);
 403
 404         /* Cancel any pending deadline */
 405         setPop(0);
 406         while (lapic_is_interrupting(LAPIC_TIMER_VECTOR)) {
 407                 (void) ml_set_interrupts_enabled(TRUE);
 408                 setPop(0);
 409                 ml_set_interrupts_enabled(FALSE);
 410         }
 411
 412         /*
 413          * Call back to caller to indicate that interrupts will remain
 414          * disabled while we deep idle, wake and return.
 415          */
 416         IOCPURunPlatformQuiesceActions();
 417
 418         func(refcon);
 419
 420         acpi_idle_abstime = mach_absolute_time();
 421
 422         KERNEL_DEBUG_CONSTANT(
 423                 MACHDBG_CODE(DBG_MACH_SCHED, MACH_DEEP_IDLE) | DBG_FUNC_START,
 424                 acpi_idle_abstime, deep_idle_rebase, 0, 0, 0);
 425
 426         /*
 427          * Disable tracing during S0-sleep
 428          * unless overridden by sysctl -w tsc.deep_idle_rebase=0
 429          */
 430         if (deep_idle_rebase) {
 431                 save_kdebug_enable = kdebug_enable;
 432                 kdebug_enable = 0;
 433         }
 434
 435         /*
 436          * Call into power-management to enter the lowest C-state.
 437          * Note when called on the boot processor this routine will
 438          * return directly when awoken.
 439          */
 440         pmCPUHalt(PM_HALT_SLEEP);
 441
 442         /*
 443          * Get wakeup time relative to the TSC which has progressed.
 444          * Then rebase nanotime to reflect time not progressing over sleep
 445          * - unless overriden so that tracing can occur during deep_idle.
 446          */
 447         acpi_wake_abstime = mach_absolute_time();
 448         if (deep_idle_rebase) {
 449                 rtc_sleep_wakeup(acpi_idle_abstime);
 450                 kdebug_enable = save_kdebug_enable;
 451         }
 452         acpi_wake_postrebase_abstime = mach_absolute_time();
 453         assert(mach_absolute_time() >= acpi_idle_abstime);
 454
 455         KERNEL_DEBUG_CONSTANT(
 456                 MACHDBG_CODE(DBG_MACH_SCHED, MACH_DEEP_IDLE) | DBG_FUNC_END,
 457                 acpi_wake_abstime, acpi_wake_abstime - acpi_idle_abstime, 0, 0, 0);
 458
 459         /* Like S3 sleep, turn on tracing if trace_wake boot-arg is present */
 460         if (kdebug_enable == 0) {
 461                 if (wake_nkdbufs) {
 462                         __kdebug_only uint64_t start = mach_absolute_time();
 463                         kdebug_trace_start(wake_nkdbufs, NULL, TRUE);
 464                         KDBG(IOKDBG_CODE(DBG_HIBERNATE, 15), start);
 465                 }
 466         }
 467
 468         IOCPURunPlatformActiveActions();
 469
 470         /* Restart timer interrupts */
 471         rtc_timer_start();
 472 }
 473
 474 extern char real_mode_bootstrap_end[];
 475 extern char real_mode_bootstrap_base[];
 476
 477 void
 478 install_real_mode_bootstrap(void *prot_entry)
 479 {
 480         /*
 481          * Copy the boot entry code to the real-mode vector area REAL_MODE_BOOTSTRAP_OFFSET.
 482          * This is in page 1 which has been reserved for this purpose by
 483          * machine_startup() from the boot processor.
 484          * The slave boot code is responsible for switching to protected
 485          * mode and then jumping to the common startup, _start().
 486          */
 487         bcopy_phys(kvtophys((vm_offset_t) real_mode_bootstrap_base),
 488                    (addr64_t) REAL_MODE_BOOTSTRAP_OFFSET,
 489                    real_mode_bootstrap_end-real_mode_bootstrap_base);
 490
 491         /*
 492          * Set the location at the base of the stack to point to the
 493          * common startup entry.
 494          */
 495         ml_phys_write_word(
 496                 PROT_MODE_START+REAL_MODE_BOOTSTRAP_OFFSET,
 497                 (unsigned int)kvtophys((vm_offset_t)prot_entry));
 498
 499         /* Flush caches */
 500         __asm__("wbinvd");
 501 }
 502
 503 boolean_t
 504 ml_recent_wake(void) {
 505         uint64_t ctime = mach_absolute_time();
 506         assert(ctime > acpi_wake_postrebase_abstime);
 507         return ((ctime - acpi_wake_postrebase_abstime) < 5 * NSEC_PER_SEC);
 508 }