KDBG/Kernel.cpp

   1 //
   2 //  Kernel.cpp
   3 //  KDBG
   4 //
   5 //  Created by James McIlree on 4/17/13.
   6 //  Copyright (c) 2014 Apple. All rights reserved.
   7 //
   8
   9 #include "KDebug.h"
  10
  11 using namespace util;
  12
  13 bool Kernel::is_64_bit()
  14 {
  15         int mib[4];
  16         size_t len;
  17         struct kinfo_proc kp;
  18
  19         /* Now determine if the kernel is running in 64-bit mode */
  20         mib[0] = CTL_KERN;
  21         mib[1] = KERN_PROC;
  22         mib[2] = KERN_PROC_PID;
  23         mib[3] = 0; /* kernproc, pid 0 */
  24         len = sizeof(kp);
  25         if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &kp, &len, NULL, 0) == -1) {
  26                 THROW("sysctl to get kernel size failed");
  27         }
  28
  29         if (kp.kp_proc.p_flag & P_LP64)
  30                 return true;
  31
  32         return false;
  33 }
  34
  35 uint32_t Kernel::active_cpu_count()
  36 {
  37         int mib[4];
  38         size_t len;
  39         int     num_cpus;
  40
  41         /*
  42          * grab the number of cpus and scale the buffer size
  43          */
  44         mib[0] = CTL_HW;
  45         mib[1] = HW_NCPU;
  46         mib[2] = 0;
  47         len = sizeof(num_cpus);
  48
  49         sysctl(mib, 2, &num_cpus, &len, NULL, 0);
  50
  51         return num_cpus;
  52 }