arch/arm-native/exec/exec_idle.c

   1 /*
   2     Copyright © 1995-2015, The AROS Development Team. All rights reserved.
   3     $Id$
   4 */
   5
   6 #define DEBUG 0
   7
   8 #include <proto/exec.h>
   9 #include "exec_intern.h"
  10 #include "kernel_intern.h"
  11 #include "kernel_cpu.h"
  12 #include "kernel_syscall.h"
  13
  14 #include "etask.h"
  15
  16 void IdleTask(struct ExecBase *SysBase)
  17 {
  18 #if defined(DEBUG)
  19     struct Task *thisTask = FindTask(NULL);
  20     int cpunum;
  21     register int tmp asm("r0");
  22     asm volatile ("swi %[swi_no]" : "=r"(tmp) : [swi_no] "I" (SC_GETCPUNUMBER) : "lr");
  23     cpunum = tmp;
  24 #endif
  25
  26     D(bug("[IDLE:%02d] %s started up\n", cpunum, thisTask->tc_Node.ln_Name));
  27
  28     asm volatile ("swi %[swi_no]" : : [swi_no] "I" (SC_SUPERSTATE) : "lr");
  29     asm volatile ("swi %[swi_no]" : : [swi_no] "I" (SC_STI) : "lr");
  30
  31     do
  32     {
  33         /* forever */
  34         D(bug("[IDLE:%02d] CPU has idled for %d seconds..\n", cpunum, GetIntETask(thisTask)->iet_CpuTime.tv_secs));
  35         asm volatile("mov r0, #0\n\t mcr p15, 0, r0, c7, c0, 4":::"r0");
  36     } while(1);
  37 }