rom/exec/supervisoralert.c

   1 /*
   2     Copyright © 2012-2015, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: Display an alert passed from supervisor mode.
   6     Lang: english
   7 */
   8
   9 #include <aros/debug.h>
  10 #include <exec/alerts.h>
  11 #include <exec/rawfmt.h>
  12 #include <intuition/intuition.h>
  13 #include <proto/exec.h>
  14 #include <proto/intuition.h>
  15 #include <proto/kernel.h>
  16
  17 #include "etask.h"
  18 #include "exec_intern.h"
  19 #include "exec_util.h"
  20
  21 LONG Alert_AskSuspend(struct Task *task, ULONG alertNum, char * buffer, struct ExecBase *SysBase);
  22 void Alert_DisplayKrnAlert(struct Task * task, ULONG alertNum, APTR location, APTR stack, UBYTE type, APTR data,
  23         struct ExecBase *SysBase);
  24
  25 /*
  26  * This task tries to display alerts that occured in supervisor mode. The task that caused the
  27  * problem is available in SAT.sat_Params[1]. The code that raised Alert is responsible for
  28  * stopping/sanitizing the task itself. Since the task is already stopped, AT_DeadEnd is added to
  29  * when invoking alert functions so that user does not have an option to continue the task.
  30  */
  31 void SupervisorAlertTask(struct ExecBase *SysBase)
  32 {
  33     struct IntExecBase * IntSysBase = PrivExecBase(SysBase);
  34     char * buffer = AllocMem(ALERT_BUFFER_SIZE, MEMF_ANY);
  35     LONG res, i;
  36     struct Task * t = NULL;
  37     ULONG alertNum = 0;
  38
  39     IntSysBase->SAT.sat_Task = GET_THIS_TASK;
  40     IntSysBase->SAT.sat_IsAvailable = TRUE;
  41
  42     while(TRUE)
  43     {
  44         Wait(SIGF_SINGLE);
  45
  46         Disable();
  47         /* Mark task as in use so that nested crash will use critical error path, see Exec_SystemAlert */
  48         IntSysBase->SAT.sat_IsAvailable = FALSE;
  49         t = (struct Task*)IntSysBase->SAT.sat_Params[1];
  50         alertNum = IntSysBase->SAT.sat_Params[0];
  51         Enable();
  52
  53         res = Alert_AskSuspend(t, alertNum | AT_DeadEnd, buffer, SysBase);
  54
  55         if (res == -1)
  56         {
  57             /* It was not possible to report error to user, fallback to critical error path */
  58             struct IntETask * iet = GetIntETask(t);
  59             Disable();
  60
  61             Alert_DisplayKrnAlert(t, alertNum | AT_DeadEnd, iet->iet_AlertLocation, iet->iet_AlertStack,
  62                     iet->iet_AlertType, (APTR)&iet->iet_AlertData, SysBase);
  63
  64             if (alertNum & AT_DeadEnd)
  65             {
  66                 /* Um, we have to do something here in order to prevent the
  67                    computer from continuing... */
  68                 ColdReboot();
  69                 ShutdownA(SD_ACTION_COLDREBOOT);
  70             }
  71
  72             Enable();
  73         }
  74
  75         switch (res)
  76         {
  77         case 0:
  78             ShutdownA(SD_ACTION_POWEROFF);
  79             break;
  80
  81         case 2:
  82             /* Suspend actually should have already happened by code raising Alert */
  83             break;
  84
  85         case 3:
  86             ColdReboot();
  87             /* In case if ColdReboot() doesn't work */
  88             ShutdownA(SD_ACTION_COLDREBOOT);
  89             break;
  90         }
  91
  92
  93         Disable();
  94         /* Mark task as available */
  95         IntSysBase->SAT.sat_IsAvailable = TRUE;
  96         for (i = 0; i < 2; i++)
  97             IntSysBase->SAT.sat_Params[i] = (IPTR)NULL;
  98         t = NULL;
  99         alertNum = 0;
 100         Enable();
 101     }
 102 }