arch/all-pc/kernel/clearcpumask.c

   1 /*
   2     Copyright © 2017, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc:
   6 */
   7
   8 #include <aros/kernel.h>
   9 #include <aros/libcall.h>
  10
  11 #include "kernel_base.h"
  12 #include "kernel_intern.h"
  13
  14 AROS_LH1(void, KrnClearCPUMask,
  15         AROS_LHA(void *, mask, A0),
  16         struct KernelBase *, KernelBase, 44, Kernel)
  17 {
  18     AROS_LIBFUNC_INIT
  19
  20     ULONG *apicMask;
  21     struct PlatformData *pdata = KernelBase->kb_PlatformData;
  22     struct APICData *apicData;
  23     int count, i;
  24
  25     if ((IPTR)mask == TASKAFFINITY_ANY)
  26         return;
  27
  28     if ((pdata) && (pdata->kb_APIC) && ((apicMask = (ULONG *)mask) != NULL))
  29     {
  30         apicData = pdata->kb_APIC;
  31
  32         count = apicData->apic_count / 32;
  33
  34         if ((count * 32) < apicData->apic_count)
  35             count += 1;
  36
  37         for (i = 0; i < count; i++)
  38             apicMask[i] = 0;
  39     }
  40     return;
  41
  42     AROS_LIBFUNC_EXIT
  43 }