osfmk/i386/cpu_data.h

   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,
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  23  * Please see the License for the specific language governing rights and
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  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * @OSF_COPYRIGHT@
  30  *
  31  */
  32
  33 #ifndef I386_CPU_DATA
  34 #define I386_CPU_DATA
  35
  36 #include <mach_assert.h>
  37
  38 #include <kern/assert.h>
  39 #include <kern/kern_types.h>
  40 #include <kern/queue.h>
  41 #include <kern/processor.h>
  42 #include <kern/pms.h>
  43 #include <pexpert/pexpert.h>
  44 #include <mach/i386/thread_status.h>
  45 #include <mach/i386/vm_param.h>
  46 #include <i386/locks.h>
  47 #include <i386/rtclock_protos.h>
  48 #include <i386/pmCPU.h>
  49 #include <i386/cpu_topology.h>
  50 #include <i386/seg.h>
  51
  52 #if CONFIG_VMX
  53 #include <i386/vmx/vmx_cpu.h>
  54 #endif
  55
  56 #if MONOTONIC
  57 #include <machine/monotonic.h>
  58 #endif /* MONOTONIC */
  59
  60 #include <machine/pal_routines.h>
  61
  62 /*
  63  * Data structures referenced (anonymously) from per-cpu data:
  64  */
  65 struct cpu_cons_buffer;
  66 struct cpu_desc_table;
  67 struct mca_state;
  68 struct prngContext;
  69
  70 /*
  71  * Data structures embedded in per-cpu data:
  72  */
  73 typedef struct rtclock_timer {
  74         mpqueue_head_t          queue;
  75         uint64_t                deadline;
  76         uint64_t                when_set;
  77         boolean_t               has_expired;
  78 } rtclock_timer_t;
  79
  80 typedef struct {
  81         /* The 'u' suffixed fields store the double-mapped descriptor addresses */
  82         struct x86_64_tss       *cdi_ktssu;
  83         struct x86_64_tss       *cdi_ktssb;
  84         x86_64_desc_register_t  cdi_gdtu;
  85         x86_64_desc_register_t  cdi_gdtb;
  86         x86_64_desc_register_t  cdi_idtu;
  87         x86_64_desc_register_t  cdi_idtb;
  88         struct fake_descriptor  *cdi_ldtu;
  89         struct fake_descriptor  *cdi_ldtb;
  90         vm_offset_t             cdi_sstku;
  91         vm_offset_t             cdi_sstkb;
  92 } cpu_desc_index_t;
  93
  94 typedef enum {
  95         TASK_MAP_32BIT,                 /* 32-bit user, compatibility mode */
  96         TASK_MAP_64BIT,                 /* 64-bit user thread, shared space */
  97 } task_map_t;
  98
  99
 100 /*
 101  * This structure is used on entry into the (uber-)kernel on syscall from
 102  * a 64-bit user. It contains the address of the machine state save area
 103  * for the current thread and a temporary place to save the user's rsp
 104  * before loading this address into rsp.
 105  */
 106 typedef struct {
 107         addr64_t        cu_isf;         /* thread->pcb->iss.isf */
 108         uint64_t        cu_tmp;         /* temporary scratch */
 109         addr64_t        cu_user_gs_base;
 110 } cpu_uber_t;
 111
 112 typedef uint16_t        pcid_t;
 113 typedef uint8_t         pcid_ref_t;
 114
 115 #define CPU_RTIME_BINS (12)
 116 #define CPU_ITIME_BINS (CPU_RTIME_BINS)
 117
 118 #define MAXPLFRAMES (16)
 119 typedef struct {
 120         boolean_t pltype;
 121         int plevel;
 122         uint64_t plbt[MAXPLFRAMES];
 123 } plrecord_t;
 124
 125 /*
 126  * Per-cpu data.
 127  *
 128  * Each processor has a per-cpu data area which is dereferenced through the
 129  * current_cpu_datap() macro. For speed, the %gs segment is based here, and
 130  * using this, inlines provides single-instruction access to frequently used
 131  * members - such as get_cpu_number()/cpu_number(), and get_active_thread()/
 132  * current_thread().
 133  *
 134  * Cpu data owned by another processor can be accessed using the
 135  * cpu_datap(cpu_number) macro which uses the cpu_data_ptr[] array of per-cpu
 136  * pointers.
 137  */
 138 typedef struct {
 139         pcid_t                  cpu_pcid_free_hint;
 140 #define PMAP_PCID_MAX_PCID      (0x800)
 141         pcid_ref_t              cpu_pcid_refcounts[PMAP_PCID_MAX_PCID];
 142         pmap_t                  cpu_pcid_last_pmap_dispatched[PMAP_PCID_MAX_PCID];
 143 } pcid_cdata_t;
 144
 145 typedef struct cpu_data
 146 {
 147         struct pal_cpu_data     cpu_pal_data;           /* PAL-specific data */
 148 #define                         cpu_pd cpu_pal_data     /* convenience alias */
 149         struct cpu_data         *cpu_this;              /* pointer to myself */
 150         thread_t                cpu_active_thread;
 151         thread_t                cpu_nthread;
 152         volatile int            cpu_preemption_level;
 153         int                     cpu_number;             /* Logical CPU */
 154         void                    *cpu_int_state;         /* interrupt state */
 155         vm_offset_t             cpu_active_stack;       /* kernel stack base */
 156         vm_offset_t             cpu_kernel_stack;       /* kernel stack top */
 157         vm_offset_t             cpu_int_stack_top;
 158         int                     cpu_interrupt_level;
 159         volatile int            cpu_signals;            /* IPI events */
 160         volatile int            cpu_prior_signals;      /* Last set of events,
 161                                                          * debugging
 162                                                          */
 163         ast_t                   cpu_pending_ast;
 164         volatile int            cpu_running;
 165 #if !MONOTONIC
 166         boolean_t               cpu_fixed_pmcs_enabled;
 167 #endif /* !MONOTONIC */
 168         rtclock_timer_t         rtclock_timer;
 169         uint64_t                quantum_timer_deadline;
 170         volatile addr64_t       cpu_active_cr3 __attribute((aligned(64)));
 171         union {
 172                 volatile uint32_t cpu_tlb_invalid;
 173                 struct {
 174                         volatile uint16_t cpu_tlb_invalid_local;
 175                         volatile uint16_t cpu_tlb_invalid_global;
 176                 };
 177         };
 178         volatile task_map_t     cpu_task_map;
 179         volatile addr64_t       cpu_task_cr3;
 180         addr64_t                cpu_kernel_cr3;
 181         volatile addr64_t       cpu_ucr3;
 182         boolean_t               cpu_pagezero_mapped;
 183         cpu_uber_t              cpu_uber;
 184 /* Double-mapped per-CPU exception stack address */
 185         uintptr_t               cd_estack;
 186 /* Address of shadowed, partially mirrored CPU data structures located
 187  * in the double mapped PML4
 188  */
 189         void                    *cd_shadow;
 190         struct processor        *cpu_processor;
 191 #if NCOPY_WINDOWS > 0
 192         struct cpu_pmap         *cpu_pmap;
 193 #endif
 194         struct real_descriptor  *cpu_ldtp;
 195         struct cpu_desc_table   *cpu_desc_tablep;
 196         cpu_desc_index_t        cpu_desc_index;
 197         int                     cpu_ldt;
 198 #if NCOPY_WINDOWS > 0
 199         vm_offset_t             cpu_copywindow_base;
 200         uint64_t                *cpu_copywindow_pdp;
 201
 202         vm_offset_t             cpu_physwindow_base;
 203         uint64_t                *cpu_physwindow_ptep;
 204 #endif
 205
 206 #define HWINTCNT_SIZE 256
 207         uint32_t                cpu_hwIntCnt[HWINTCNT_SIZE];    /* Interrupt counts */
 208         uint64_t                cpu_hwIntpexits[HWINTCNT_SIZE];
 209         uint64_t                cpu_dr7; /* debug control register */
 210         uint64_t                cpu_int_event_time;     /* intr entry/exit time */
 211         pal_rtc_nanotime_t      *cpu_nanotime;          /* Nanotime info */
 212 #if KPC
 213         /* double-buffered performance counter data */
 214         uint64_t                *cpu_kpc_buf[2];
 215         /* PMC shadow and reload value buffers */
 216         uint64_t                *cpu_kpc_shadow;
 217         uint64_t                *cpu_kpc_reload;
 218 #endif
 219 #if MONOTONIC
 220         struct mt_cpu cpu_monotonic;
 221 #endif /* MONOTONIC */
 222         uint32_t                cpu_pmap_pcid_enabled;
 223         pcid_t                  cpu_active_pcid;
 224         pcid_t                  cpu_last_pcid;
 225         pcid_t                  cpu_kernel_pcid;
 226         volatile pcid_ref_t     *cpu_pmap_pcid_coherentp;
 227         volatile pcid_ref_t     *cpu_pmap_pcid_coherentp_kernel;
 228         pcid_cdata_t            *cpu_pcid_data;
 229 #ifdef  PCID_STATS
 230         uint64_t                cpu_pmap_pcid_flushes;
 231         uint64_t                cpu_pmap_pcid_preserves;
 232 #endif
 233         uint64_t                cpu_aperf;
 234         uint64_t                cpu_mperf;
 235         uint64_t                cpu_c3res;
 236         uint64_t                cpu_c6res;
 237         uint64_t                cpu_c7res;
 238         uint64_t                cpu_itime_total;
 239         uint64_t                cpu_rtime_total;
 240         uint64_t                cpu_ixtime;
 241         uint64_t                cpu_idle_exits;
 242         uint64_t                cpu_rtimes[CPU_RTIME_BINS];
 243         uint64_t                cpu_itimes[CPU_ITIME_BINS];
 244 #if !MONOTONIC
 245         uint64_t                cpu_cur_insns;
 246         uint64_t                cpu_cur_ucc;
 247         uint64_t                cpu_cur_urc;
 248 #endif /* !MONOTONIC */
 249         uint64_t                cpu_gpmcs[4];
 250         uint64_t                cpu_max_observed_int_latency;
 251         int                     cpu_max_observed_int_latency_vector;
 252         volatile boolean_t      cpu_NMI_acknowledged;
 253         uint64_t                debugger_entry_time;
 254         uint64_t                debugger_ipi_time;
 255         /* A separate nested interrupt stack flag, to account
 256          * for non-nested interrupts arriving while on the interrupt stack
 257          * Currently only occurs when AICPM enables interrupts on the
 258          * interrupt stack during processor offlining.
 259          */
 260         uint32_t                cpu_nested_istack;
 261         uint32_t                cpu_nested_istack_events;
 262         x86_saved_state64_t     *cpu_fatal_trap_state;
 263         x86_saved_state64_t     *cpu_post_fatal_trap_state;
 264 #if CONFIG_VMX
 265         vmx_cpu_t               cpu_vmx;                /* wonderful world of virtualization */
 266 #endif
 267 #if CONFIG_MCA
 268         struct mca_state        *cpu_mca_state;         /* State at MC fault */
 269 #endif
 270         struct prngContext      *cpu_prng;              /* PRNG's context */
 271         int                     cpu_type;
 272         int                     cpu_subtype;
 273         int                     cpu_threadtype;
 274         boolean_t               cpu_iflag;
 275         boolean_t               cpu_boot_complete;
 276         int                     cpu_hibernate;
 277 #define MAX_PREEMPTION_RECORDS (8)
 278 #if     DEVELOPMENT || DEBUG
 279         int                     cpu_plri;
 280         plrecord_t              plrecords[MAX_PREEMPTION_RECORDS];
 281 #endif
 282         void                    *cpu_console_buf;
 283         struct x86_lcpu         lcpu;
 284         int                     cpu_phys_number;        /* Physical CPU */
 285         cpu_id_t                cpu_id;                 /* Platform Expert */
 286 #if DEBUG
 287         uint64_t                cpu_entry_cr3;
 288         uint64_t                cpu_exit_cr3;
 289         uint64_t                cpu_pcid_last_cr3;
 290 #endif
 291 } cpu_data_t;
 292
 293 extern cpu_data_t       *cpu_data_ptr[];
 294
 295 /* Macro to generate inline bodies to retrieve per-cpu data fields. */
 296 #if defined(__clang__)
 297 #define GS_RELATIVE volatile __attribute__((address_space(256)))
 298 #ifndef offsetof
 299 #define offsetof(TYPE,MEMBER) __builtin_offsetof(TYPE,MEMBER)
 300 #endif
 301
 302 #define CPU_DATA_GET(member,type)                                                                               \
 303         cpu_data_t GS_RELATIVE *cpu_data =                                                      \
 304                 (cpu_data_t GS_RELATIVE *)0UL;                                                                  \
 305         type ret;                                                                                                                       \
 306         ret = cpu_data->member;                                                                                         \
 307         return ret;
 308
 309 #define CPU_DATA_GET_INDEX(member,index,type)                                                   \
 310         cpu_data_t GS_RELATIVE *cpu_data =                                                      \
 311                 (cpu_data_t GS_RELATIVE *)0UL;                                                                  \
 312         type ret;                                                                                                                       \
 313         ret = cpu_data->member[index];                                                                          \
 314         return ret;
 315
 316 #define CPU_DATA_SET(member,value)                                                                              \
 317         cpu_data_t GS_RELATIVE *cpu_data =                                                      \
 318                 (cpu_data_t GS_RELATIVE *)0UL;                                                                  \
 319         cpu_data->member = value;
 320
 321 #define CPU_DATA_XCHG(member,value,type)                                                                \
 322         cpu_data_t GS_RELATIVE *cpu_data =                                                      \
 323                 (cpu_data_t GS_RELATIVE *)0UL;                                                                  \
 324         type ret;                                                                                                                       \
 325         ret = cpu_data->member;                                                                                         \
 326         cpu_data->member = value;                                                                                       \
 327         return ret;
 328
 329 #else /* !defined(__clang__) */
 330
 331 #ifndef offsetof
 332 #define offsetof(TYPE,MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
 333 #endif /* offsetof */
 334 #define CPU_DATA_GET(member,type)                                       \
 335         type ret;                                                       \
 336         __asm__ volatile ("mov %%gs:%P1,%0"                             \
 337                 : "=r" (ret)                                            \
 338                 : "i" (offsetof(cpu_data_t,member)));                   \
 339         return ret;
 340
 341 #define CPU_DATA_GET_INDEX(member,index,type)   \
 342         type ret;                                                       \
 343         __asm__ volatile ("mov %%gs:(%1),%0"                            \
 344                 : "=r" (ret)                                            \
 345                 : "r" (offsetof(cpu_data_t,member[index])));                    \
 346         return ret;
 347
 348 #define CPU_DATA_SET(member,value)                                      \
 349         __asm__ volatile ("mov %0,%%gs:%P1"                             \
 350                 :                                                       \
 351                 : "r" (value), "i" (offsetof(cpu_data_t,member)));
 352
 353 #define CPU_DATA_XCHG(member,value,type)                                \
 354         type ret;                                                       \
 355         __asm__ volatile ("xchg %0,%%gs:%P1"                            \
 356                 : "=r" (ret)                                            \
 357                 : "i" (offsetof(cpu_data_t,member)), "0" (value));      \
 358         return ret;
 359
 360 #endif /* !defined(__clang__) */
 361
 362 /*
 363  * Everyone within the osfmk part of the kernel can use the fast
 364  * inline versions of these routines.  Everyone outside, must call
 365  * the real thing,
 366  */
 367 static inline thread_t
 368 get_active_thread(void)
 369 {
 370         CPU_DATA_GET(cpu_active_thread,thread_t)
 371 }
 372 #define current_thread_fast()           get_active_thread()
 373 #define current_thread()                current_thread_fast()
 374
 375 #define cpu_mode_is64bit()              TRUE
 376
 377 static inline int
 378 get_preemption_level(void)
 379 {
 380         CPU_DATA_GET(cpu_preemption_level,int)
 381 }
 382 static inline int
 383 get_interrupt_level(void)
 384 {
 385         CPU_DATA_GET(cpu_interrupt_level,int)
 386 }
 387 static inline int
 388 get_cpu_number(void)
 389 {
 390         CPU_DATA_GET(cpu_number,int)
 391 }
 392 static inline int
 393 get_cpu_phys_number(void)
 394 {
 395         CPU_DATA_GET(cpu_phys_number,int)
 396 }
 397
 398 static inline cpu_data_t *
 399 current_cpu_datap(void) {
 400         CPU_DATA_GET(cpu_this, cpu_data_t *);
 401 }
 402
 403 /*
 404  * Facility to diagnose preemption-level imbalances, which are otherwise
 405  * challenging to debug. On each operation that enables or disables preemption,
 406  * we record a backtrace into a per-CPU ring buffer, along with the current
 407  * preemption level and operation type. Thus, if an imbalance is observed,
 408  * one can examine these per-CPU records to determine which codepath failed
 409  * to re-enable preemption, enabled premption without a corresponding
 410  * disablement etc. The backtracer determines which stack is currently active,
 411  * and uses that to perform bounds checks on unterminated stacks.
 412  * To enable, sysctl -w machdep.pltrace=1 on DEVELOPMENT or DEBUG kernels (DRK '15)
 413  * The bounds check currently doesn't account for non-default thread stack sizes.
 414  */
 415 #if DEVELOPMENT || DEBUG
 416 static inline void pltrace_bt(uint64_t *rets, int maxframes, uint64_t stacklo, uint64_t stackhi) {
 417         uint64_t *cfp = (uint64_t *) __builtin_frame_address(0);
 418         int plbtf;
 419
 420         assert(stacklo !=0  && stackhi !=0);
 421
 422         for (plbtf = 0; plbtf < maxframes; plbtf++) {
 423                 if (((uint64_t)cfp == 0) || (((uint64_t)cfp < stacklo) || ((uint64_t)cfp > stackhi))) {
 424                         rets[plbtf] = 0;
 425                         continue;
 426                 }
 427                 rets[plbtf] = *(cfp + 1);
 428                 cfp = (uint64_t *) (*cfp);
 429         }
 430 }
 431
 432
 433 extern uint32_t         low_intstack[];         /* bottom */
 434 extern uint32_t         low_eintstack[];        /* top */
 435 extern char             mp_slave_stack[PAGE_SIZE];
 436
 437 static inline void pltrace_internal(boolean_t enable) {
 438         cpu_data_t *cdata = current_cpu_datap();
 439         int cpli = cdata->cpu_preemption_level;
 440         int cplrecord = cdata->cpu_plri;
 441         uint64_t kstackb, kstackt, *plbts;
 442
 443         assert(cpli >= 0);
 444
 445         cdata->plrecords[cplrecord].pltype = enable;
 446         cdata->plrecords[cplrecord].plevel = cpli;
 447
 448         plbts = &cdata->plrecords[cplrecord].plbt[0];
 449
 450         cplrecord++;
 451
 452         if (cplrecord >= MAX_PREEMPTION_RECORDS) {
 453                 cplrecord = 0;
 454         }
 455
 456         cdata->cpu_plri = cplrecord;
 457         /* Obtain the 'current' program counter, initial backtrace
 458          * element. This will also indicate if we were unable to
 459          * trace further up the stack for some reason
 460          */
 461         __asm__ volatile("leaq 1f(%%rip), %%rax; mov %%rax, %0\n1:"
 462             : "=m" (plbts[0])
 463             :
 464             : "rax");
 465
 466
 467         thread_t cplthread = cdata->cpu_active_thread;
 468         if (cplthread) {
 469                 uintptr_t csp;
 470                 __asm__ __volatile__ ("movq %%rsp, %0": "=r" (csp):);
 471                 /* Determine which stack we're on to populate stack bounds.
 472                  * We don't need to trace across stack boundaries for this
 473                  * routine.
 474                  */
 475                 kstackb = cdata->cpu_active_stack;
 476                 kstackt = kstackb + KERNEL_STACK_SIZE;
 477                 if (csp < kstackb || csp > kstackt) {
 478                         kstackt = cdata->cpu_kernel_stack;
 479                         kstackb = kstackb - KERNEL_STACK_SIZE;
 480                         if (csp < kstackb || csp > kstackt) {
 481                                 kstackt = cdata->cpu_int_stack_top;
 482                                 kstackb = kstackt - INTSTACK_SIZE;
 483                                 if (csp < kstackb || csp > kstackt) {
 484                                         kstackt = (uintptr_t)low_eintstack;
 485                                         kstackb = (uintptr_t)low_eintstack - INTSTACK_SIZE;
 486                                         if (csp < kstackb || csp > kstackt) {
 487                                                 kstackb = (uintptr_t) mp_slave_stack;
 488                                                 kstackt = (uintptr_t) mp_slave_stack + PAGE_SIZE;
 489                                         }
 490                                 }
 491                         }
 492                 }
 493
 494                 if (kstackb) {
 495                         pltrace_bt(&plbts[1], MAXPLFRAMES - 1, kstackb, kstackt);
 496                 }
 497         }
 498 }
 499
 500 extern int plctrace_enabled;
 501 #endif /* DEVELOPMENT || DEBUG */
 502
 503 static inline void pltrace(boolean_t plenable) {
 504 #if DEVELOPMENT || DEBUG
 505         if (__improbable(plctrace_enabled != 0)) {
 506                 pltrace_internal(plenable);
 507         }
 508 #else
 509         (void)plenable;
 510 #endif
 511 }
 512
 513 static inline void
 514 disable_preemption_internal(void) {
 515         assert(get_preemption_level() >= 0);
 516
 517 #if defined(__clang__)
 518         cpu_data_t GS_RELATIVE *cpu_data = (cpu_data_t GS_RELATIVE *)0UL;
 519         cpu_data->cpu_preemption_level++;
 520 #else
 521         __asm__ volatile ("incl %%gs:%P0"
 522             :
 523             : "i" (offsetof(cpu_data_t, cpu_preemption_level)));
 524 #endif
 525         pltrace(FALSE);
 526 }
 527
 528 static inline void
 529 enable_preemption_internal(void) {
 530         assert(get_preemption_level() > 0);
 531         pltrace(TRUE);
 532 #if defined(__clang__)
 533         cpu_data_t GS_RELATIVE *cpu_data = (cpu_data_t GS_RELATIVE *)0UL;
 534         if (0 == --cpu_data->cpu_preemption_level)
 535                 kernel_preempt_check();
 536 #else
 537         __asm__ volatile ("decl %%gs:%P0                \n\t"
 538                           "jne 1f                       \n\t"
 539                           "call _kernel_preempt_check   \n\t"
 540                           "1:"
 541                         : /* no outputs */
 542                         : "i" (offsetof(cpu_data_t, cpu_preemption_level))
 543                         : "eax", "ecx", "edx", "cc", "memory");
 544 #endif
 545 }
 546
 547 static inline void
 548 enable_preemption_no_check(void)
 549 {
 550         assert(get_preemption_level() > 0);
 551
 552         pltrace(TRUE);
 553 #if defined(__clang__)
 554         cpu_data_t GS_RELATIVE *cpu_data = (cpu_data_t GS_RELATIVE *)0UL;
 555         cpu_data->cpu_preemption_level--;
 556 #else
 557         __asm__ volatile ("decl %%gs:%P0"
 558                         : /* no outputs */
 559                         : "i" (offsetof(cpu_data_t, cpu_preemption_level))
 560                         : "cc", "memory");
 561 #endif
 562 }
 563
 564 static inline void
 565 _enable_preemption_no_check(void) {
 566         enable_preemption_no_check();
 567 }
 568
 569 static inline void
 570 mp_disable_preemption(void)
 571 {
 572         disable_preemption_internal();
 573 }
 574
 575 static inline void
 576 _mp_disable_preemption(void)
 577 {
 578         disable_preemption_internal();
 579 }
 580
 581 static inline void
 582 mp_enable_preemption(void)
 583 {
 584         enable_preemption_internal();
 585 }
 586
 587 static inline void
 588 _mp_enable_preemption(void) {
 589         enable_preemption_internal();
 590 }
 591
 592 static inline void
 593 mp_enable_preemption_no_check(void) {
 594         enable_preemption_no_check();
 595 }
 596
 597 static inline void
 598 _mp_enable_preemption_no_check(void) {
 599         enable_preemption_no_check();
 600 }
 601
 602 #ifdef XNU_KERNEL_PRIVATE
 603 #define disable_preemption() disable_preemption_internal()
 604 #define enable_preemption() enable_preemption_internal()
 605 #define MACHINE_PREEMPTION_MACROS (1)
 606 #endif
 607
 608 static inline cpu_data_t *
 609 cpu_datap(int cpu) {
 610         return cpu_data_ptr[cpu];
 611 }
 612
 613 static inline int
 614 cpu_is_running(int cpu) {
 615         return ((cpu_datap(cpu) != NULL) && (cpu_datap(cpu)->cpu_running));
 616 }
 617
 618 #ifdef MACH_KERNEL_PRIVATE
 619 static inline cpu_data_t *
 620 cpu_shadowp(int cpu) {
 621         return cpu_data_ptr[cpu]->cd_shadow;
 622 }
 623
 624 #endif
 625 extern cpu_data_t *cpu_data_alloc(boolean_t is_boot_cpu);
 626 extern void cpu_data_realloc(void);
 627
 628 #endif  /* I386_CPU_DATA */