arch/arm-native/kernel/getcpucount.c

   1 /*
   2     Copyright © 2015, The AROS Development Team. All rights reserved.
   3     $Id$
   4 */
   5
   6 #include <aros/kernel.h>
   7 #include <aros/libcall.h>
   8
   9 #include "kernel_base.h"
  10 #include "kernel_intern.h"
  11
  12 AROS_LH0(unsigned int, KrnGetCPUCount,
  13          struct KernelBase *, KernelBase, 36, Kernel)
  14 {
  15     AROS_LIBFUNC_INIT
  16
  17     uint32_t count;
  18
  19      count = __arm_affinitymask - ((__arm_affinitymask >> 1) & 0x55555555);
  20      count = (count & 0x33333333) + ((count >> 2) & 0x33333333);
  21      return (((count + (count >> 4)) & 0x0F0F0F0F) * 0x01010101) >> 24;
  22
  23     return count;
  24
  25     AROS_LIBFUNC_EXIT
  26 }