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174 lines
6.4 KiB
C
174 lines
6.4 KiB
C
/*
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File: Timeout.c
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Contains: routines that implement connection timeouts
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Entry points:
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Written by: Clinton Bauder
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Copyright: © 1992-1993 by Apple Computer, Inc., all rights reserved.
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Change History (most recent first):
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<SM14> 10/14/93 pdw <MC> roll-in.
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<MC3> 10/12/93 pdw Added support for Synchronous data transfers, rewrote State
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Machine, message handling etc.
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<MC2> 9/13/93 pdw Roll in from SuperMario.
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<SM13> 9/13/93 pdw Changed the risky slash pattern.
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<SM12> 7/17/93 pdw Lots of little things.
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<SM11> 6/29/93 pdw Massive checkins: Change asynchronicity mechanism to CallMachine
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stack switching mechanism. Adding support for Cold Fusion.
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Rearranging HW/SW Init code. Some code optimizations.
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<SM10> 5/25/93 DCB Rollin from Ludwig. (The next item below)
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<SM9> 5/5/93 PW Converted names to meanies-friendly names. Updated with latest
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from Ludwig stuff.
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<SM8> 3/20/93 PW rolled in Ludwig changes.
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<LW4> 3/1/93 DCB Got rid of connTimeouts and re-worked CAM timeouts so that they
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actually work. (Sorta took the best of the two) Now parameter
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blocks are only timed if they are either on the bus or the bus
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is free. This fixes the jerky mouse problem in the test tool.
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<LW3> 1/27/93 PW Added #include <SCSIStandard.h>.
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<LW2> 1/12/93 DCB Changed synchronous abort of PBs which timed out to be
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asynchronous. This fixes a deadlock caused by earlier changes
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to the abort code.
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<SM6> 12/5/92 PW Changed field names. Added SCSI.h include.
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<SM5> 11/20/92 PW Added some Includes that were removed from headers.
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<SM4> 10/8/92 PW Lots of trivial name changes.
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<SM3> 8/31/92 DCB Added AbortCommand call to kill timed-out ios.
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<SM2> 8/20/92 DCB Changed timeout value to the Time Manager convention of < 0 ==
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µS >0 == ms (From seconds)
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*/
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#include <Types.h>
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#include <Packages.h>
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#include <Memory.h>
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#include <SCSIStandard.h>
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#include <SCSI.h>
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#include "ACAM.h"
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#include "Recorder.h"
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#include "SIMCore.h"
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#include "SIMCorePriv.h"
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#include "SIMQ.h"
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/********* External Functions ************/
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extern SIMTMTask* getTimerPB();
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extern short BlockInterrupts(void);
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extern void UnblockInterrupts( short oldSR);
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/* Definition of Timeouts in ACAM <LW4>
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**
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** Since CAM is rather unclear on timeouts and what to do with them we have defined it
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** as follows; A parameter block has timed out if the total amount of time that it is
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** on the bus OR was eligible to be on the bus (ie the bus was free) after initiation has
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** exceeded the timeout value then the parameter block has timed out. If this occurs an
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** Abort Command message shall be sent to the device and its completion routine called.
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*/
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/*********************************************************************************
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StartTimer - This starts up the 1 second timer in the SIM
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*********************************************************************************/
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void
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StartTimer( SIMglobals* SIMg)
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{
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/* Assumes that SIMg is cleared to zero before use */
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SIMg->mySIMTMTask.theTask.qLink = (QElemPtr) 'eada'; /* Magic VM "operate during page fault time" marker */
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SIMg->mySIMTMTask.theTask.tmAddr = (TimerProcPtr) SIMTimerProc;
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SIMg->mySIMTMTask.SIMg = (Ptr) SIMg; /* Stuff globals into TMTask record for easy reference */
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/* How do I make this VM safe ? */
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InsXTime((QElemPtr)&SIMg->mySIMTMTask);
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PrimeTime((QElemPtr)&SIMg->mySIMTMTask,1000); /* Once a second */
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}
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/*********************************************************************************
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SIMTimerProc - This is the actual time manger task itself.
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*********************************************************************************/
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#define MAX_SIMUL_TOUT 10
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void
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SIMTimerProc( void)
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{
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SIMTMTask* theSIMTask;
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SIMglobals* SIMg;
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SIM_IO * qPtr;
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SIM_IO * tdOut[MAX_SIMUL_TOUT];
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int i,index;
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short oldSR;
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//IfRecordEvent( 0, (long)'SIMT');
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theSIMTask = (SIMTMTask *)getTimerPB(); /* Assembly language routine to return register a1 */
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/* Get the globals from the Time Manager Queue entry */
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SIMg = (SIMglobals *) theSIMTask->SIMg;
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index = 0;
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oldSR = BlockInterrupts(); //-> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> ->
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// First check to see if a PB is currently on the bus. If one is then its timer will
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// be decremented and compared against the timeout value.
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// !!!%%%_debugger! use a switch
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if( SIMg->state != kIdle &&
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SIMg->state != kInitiatingNormal &&
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SIMg->state != kInitiatingSDTR &&
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SIMg->state != kInitiatingAsyncMsg &&
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SIMg->state != kInitiatingOldCall &&
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SIMg->state != kGotR_selected &&
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SIMg->state != kWentBusFree &&
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SIMg->halPB.phase != kBusFreePhase)
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{
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if( SIMg->halPB.ioPtr->scsiTimeout &&
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SIMg->halPB.ioPtr->ioQueue == &(SIMg->qHdr) &&
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((SIMg->halPB.ioPtr->scTimer)-- == 0 || SIMg->halPB.ioPtr->ioEvent & kmTimedOut) )
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tdOut[index++] = SIMg->halPB.ioPtr; /* Remember that this timed out */
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}
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else {
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// If the machine wasn't busy then walk the queue and look for parameter blocks that
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// are eligible to be on the bus and decrement their timers.
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for( qPtr = (SIM_IO *)SIMg->qHdr.qHead; qPtr ; qPtr = (SIM_IO *)qPtr->qLink ) {
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/* First check connection timeout for active paramter blocks */
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if( qPtr->ioStat != kPBidle ) {
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if( qPtr->scsiTimeout &&
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( (qPtr->scTimer)-- == 0 || qPtr->ioEvent & kmTimedOut) ) { //<LW5>pdw
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if( index < MAX_SIMUL_TOUT ) /* if list full - wait til next interrupt */
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tdOut[index++] = qPtr; /* Remember that this timed out */
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continue; /* One kind of timeout per entry */
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}
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}
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}
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}
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/* Look through list for elements that timed out and Abort them. <SM3> */
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for( i = 0; i < index; i+=1 ) {
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// The following is a bit of a hack. We aren't keeping track of the completion
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// of the abort - so we can use the same AbortParameter block for multiple timeouts
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SIMg->abortPB.scsiFunctionCode = SCSIAbortCommand;
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SIMg->abortPB.scsiCompletion = 0;
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SIMg->abortPB.scsiDevice = tdOut[i]->scsiDevice; // Not really used
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tdOut[i]->ioEvent |= kmTimedOut; /* let the user know what happened <SM3> */
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tdOut[i]->pendingMsgPB = (Ptr) &SIMg->abortPB; /* Abort the Parameter block <LW2> */
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SwitchQ(tdOut[i],(QHdrPtr) &SIMg->immedQHdr);
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}
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UnblockInterrupts(oldSR); //<- <- <- <- <- <- <- <- <- <- <- <- <- <- <- <- <- <- <- <-
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if( index )
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NewIOStartMachine( SIMg); /* Make sure Machine gets run */
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PrimeTime((QElemPtr)&SIMg->mySIMTMTask, 1000); /* Once a second */
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}
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