arch/ppc-sam440/exec/reschedule.c

   1 /*
   2     Copyright © 1995-2001, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc:
   6     Lang: english
   7 */
   8
   9 #include <exec/types.h>
  10 #include <exec/execbase.h>
  11 #include <aros/libcall.h>
  12 #include <aros/atomic.h>
  13 #include <proto/kernel.h>
  14
  15 #include "../kernel/kernel_intern.h"
  16
  17 /*****i***********************************************************************
  18
  19     NAME */
  20 #include <proto/exec.h>
  21
  22         AROS_LH1(void, Reschedule,
  23
  24 /*  SYNOPSIS */
  25         AROS_LHA(struct Task *, task, A0),
  26
  27 /*  LOCATION */
  28         struct ExecBase *, SysBase, 8, Exec)
  29
  30 /*  FUNCTION
  31         Reschedule will place the task into one of Execs internal task
  32         lists. Which list it is placed in will depend upon whether the
  33         task is ready to run, or whether it is waiting for an external
  34         event to awaken it.
  35
  36         It is possible that in the future, more efficient schedulers
  37         will be implemented. In which case this is the function that they
  38         need to implement.
  39
  40         You should not do any costly calculations since you will be
  41         running in interupt mode.
  42
  43     INPUTS
  44         task    -   The task to insert into the list.
  45
  46     RESULT
  47         The task will be inserted into one of Exec's task lists.
  48
  49     NOTES
  50         Not actually complete yet. Some of the task states don't have any
  51         supplied action.
  52
  53     EXAMPLE
  54
  55     BUGS
  56         Only in relation to the comments within about low-priority tasks
  57         not getting any processor time.
  58
  59     SEE ALSO
  60
  61     INTERNALS
  62
  63     HISTORY
  64
  65 ******************************************************************************/
  66 {
  67     AROS_LIBFUNC_INIT
  68
  69     UBYTE flag = SysBase->AttnResched;          /* Save state of scheduling attention */
  70
  71     AROS_ATOMIC_OR(SysBase->AttnResched, 0x80);/* Set scheduling attention */
  72
  73     if (SysBase->TDNestCnt < 0)                 /* If task switching enabled */
  74     {
  75         if (SysBase->IDNestCnt < 0)             /* And interrupts enabled */
  76         {
  77             void *KernelBase = getKernelBase();
  78
  79             KrnSchedule();
  80         }
  81         else if (!(flag & 0x80))                /* Generate software interrupt */
  82         {
  83 #if 0
  84 #warning: "This is wrong!!!!!!!! It should cause the software interrupt only once interrupts are enabled again"
  85 #warning  "but this jumps directly to software interrupt, no matter if interrupts are enabled or not"
  86             __asm__ ("movl $-3,%eax\n\tint $0x80");
  87 #endif
  88         }
  89     }
  90
  91     AROS_LIBFUNC_EXIT
  92 } /* Reschedule */