rom/exec/etask.h

   1 #ifndef _ETASK_H
   2 #define _ETASK_H
   3
   4 /*
   5     Copyright © 1995-2011, The AROS Development Team. All rights reserved.
   6     $Id$
   7
   8     Desc: Internal description of the ETask structure
   9     Lang: english
  10 */
  11
  12 #include <exec/interrupts.h>
  13 #include <exec/tasks.h>
  14
  15 #include "mmextra.h"
  16 #include "mungwallextra.h"
  17
  18 /* Known alert context types */
  19 #define AT_NONE     0x00
  20 #define AT_CPU      0x01
  21 #define AT_MUNGWALL 0x02
  22 #define AT_MEMORY   0x03
  23
  24 /* Alert data. Can have different contents, depending on what actually happened */
  25 struct AlertContext
  26 {
  27     union
  28     {
  29         struct ExceptionContext acpu;
  30         struct MungwallContext  amw;
  31         struct MMContext        amm;
  32     } u;
  33 };
  34
  35 struct IntETask
  36 {
  37     struct ETask        iet_ETask;
  38 #ifdef DEBUG_ETASK
  39     STRPTR              iet_Me;
  40 #endif
  41     APTR                iet_RT;                 /* Structure for resource tracking       */
  42     APTR                iet_Context;            /* Structure to store CPU registers      */
  43     UQUAD               iet_CpuTime;
  44     UQUAD               iet_private1;
  45     ULONG               iet_AlertCode;          /* Alert code for crash handler          */
  46     UBYTE               iet_AlertType;          /* Type of the alert context             */
  47     UBYTE               iet_AlertFlags;         /* See below                             */
  48     APTR                iet_AlertLocation;      /* Alert location for crash handler      */
  49     APTR                iet_AlertStack;         /* Frame pointer for stack backtrace     */
  50     struct AlertContext iet_AlertData;          /* Extra data coming with the crash      */
  51 };
  52
  53 #define GetIntETask(task)   ((struct IntETask *)(((struct Task *) \
  54                                 (task))->tc_UnionETask.tc_ETask))
  55 #define IntETask(etask)     ((struct IntETask *)(etask))
  56
  57 /* iet_AlertFlags */
  58 #define AF_Alert    0x01        /* The task is in alert state     */
  59 #define AF_Location 0x02        /* iet_AlertLocation is filled in */
  60
  61 /*
  62  * This function resets crash status of the task:
  63  * - AF_Alert flag serves as an actual indicator of crash status.
  64  *   If we enter Alert() with this flag already set, this is
  65  *   considered a nested alert and is directed to supervisor-mode routine.
  66  * - AF_Location flag can also be set only once. It is either set explicitly
  67  *   before calling Alert(), or it is set by Alert() routine itself. So we clear
  68  *   it in order for Alert() to be able to remember it if task ever alerts again.
  69  * - iet_AlertType specifies type of alert context (if any). We make sure
  70  *   it is clear so as next time Alert() will not display old information.
  71  */
  72 static inline void ResetETask(struct IntETask *etask)
  73 {
  74     etask->iet_AlertType  = AT_NONE;
  75     etask->iet_AlertFlags = 0;
  76 }
  77
  78 #endif /* _ETASK_H */