How to install a hardware interrupt - Revision history

Costel Mincea: Text replacement - "" to ""

2025-01-26T19:06:09Z

Text replacement - "<syntaxhighlight>" to "<syntaxhighlight lang="C" line>"

← Older revision		Revision as of 19:06, 26 January 2025
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	Here is the example:		Here is the example:

	<syntaxhighlight>		<syntaxhighlight lang="C" line>
	/* realinterrupt.c - HW interrupt example code.		/* realinterrupt.c - HW interrupt example code.
	Edited and updated for amigaos 4 by Alfkil T. Wennermark 2010		Edited and updated for amigaos 4 by Alfkil T. Wennermark 2010

Alexandre Balaban: Categorized into Debug

2013-02-18T15:20:52Z

Categorized into Debug

← Older revision		Revision as of 15:20, 18 February 2013
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			[[Category:Debug]]
	== Author ==		== Author ==
	Alfkil Wennermark<br/>		Alfkil Wennermark<br/>

Steven Solie: /* Tutorial */

2012-05-01T15:51:12Z

Tutorial

← Older revision		Revision as of 15:51, 1 May 2012
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	Here is the example:		Here is the example:

			<syntaxhighlight>
	<pre>
	/* realinterrupt.c - HW interrupt example code.		/* realinterrupt.c - HW interrupt example code.
	Edited and updated for amigaos 4 by Alfkil T. Wennermark 2010		Edited and updated for amigaos 4 by Alfkil T. Wennermark 2010
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	return 0;		return 0;
	}		}
			</syntaxhighlight>
	</pre>

Steven Solie: /* Article */

2012-04-24T15:53:43Z

Article

← Older revision		Revision as of 15:53, 24 April 2012
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	Used by permission.		Used by permission.

	== ~~Article~~ ==		== Tutorial ==

	I was looking for a way to install a genuine hw interrupt, and this code is the proper way to do so. Thanks to Steven Solie, Thomas Frieden, Jörg Strohmayer and Colin Wenzel.		I was looking for a way to install a genuine hw interrupt, and this code is the proper way to do so. Thanks to Steven Solie, Thomas Frieden, Jörg Strohmayer and Colin Wenzel.

Steven Solie: /* Article */

2012-04-24T15:53:25Z

Article

← Older revision		Revision as of 15:53, 24 April 2012
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	return 0;		return 0;
	}		}
			</pre>

Steven Solie: /* Article */

2012-04-24T15:53:10Z

Article

← Older revision		Revision as of 15:53, 24 April 2012
Line 15:		Line 15:

	Here is the example:		Here is the example:

			<pre>
			/* realinterrupt.c - HW interrupt example code.
			Edited and updated for amigaos 4 by Alfkil T. Wennermark 2010
			Edited and bug-tested by Steven Solie.

			Thanks to: Steven Solie, Jörg Strohmayer, Thomas Frieden and Colin Wenzel :-) */

			/* REMARK: On a SAM/SAM-flex system, the returned counter will be a very large number.
			We have yet to figure out, why this is. On AmigaOne's it will be 1 as expected. */


			#include <exec/types.h>
			#include <proto/exec.h>
			#include <proto/dos.h>

			#include <exec/memory.h>
			#include <exec/interrupts.h>

			#include <dos/dos.h>


			#include <stdio.h>

			uint32 *beef;


			struct IData {
			uint32 counter;
			struct Interrupt *oldinterrupt;
			};

			struct IData *idata;

			#if 0 //This will not work, because it doesn't call the old interrupt
			asm (
			" .globl icode\n"
			" \n"
			"icode: \n"
			" lwz %r3, 0(%r5) \n"
			" addi %r3, %r3, 5\n"
			" stw %r3, 0(%r5) \n"
			" li %r3, 1 \n"
			" blr \n"
			);
			#endif


			ULONG icode( struct ExceptionContext context, struct ExecBase sb, APTR trapData)
			{
			struct IData d = (struct IData )trapData;
			struct Interrupt *oldi = d->oldinterrupt;

			d->counter++;

			//NB-NB-NB: You _need_ to call the old interrupt, otherwise you will go boom!
			typedef uint32 (*OLDVEC)();

			return ((OLDVEC)oldi->is_Code)(context, sb, oldi->is_Data);
			}


			int main()
			{
			enum enTrapNumbers trapnumber = TRAPNUM_DATA_SEGMENT_VIOLATION;

			if (!(idata = IExec->AllocMem(sizeof(struct IData), MEMF_SHARED \| MEMF_CLEAR)))
			return RETURN_FAIL;

			struct Interrupt *interrupt = IExec->AllocSysObjectTags(ASOT_INTERRUPT,
			ASOINTR_Code, icode,
			ASOINTR_Data, idata,
			TAG_END);

			if (interrupt == NULL)
			{
			IExec->FreeMem (idata, sizeof (struct IData));
			return(-20);
			}

			interrupt->is_Node.ln_Pri = -1;
			interrupt->is_Node.ln_Name = "my personal interrupt";

			//printf("icode = %#08x\n", icode (NULL, NULL, idata));
			//printf("counter = %d\n", idata->counter);

			printf("calling AddIntServer...\n");
			fflush(stdout);

			// IExec->Forbid();
			idata->oldinterrupt = IExec->SetIntVector(trapnumber, interrupt);
			// IExec->Permit();

			if(!idata->oldinterrupt)
			{
			printf("server not installed!\n");
			}
			else
			{
			printf("server installed\n");
			fflush(stdout);

			idata->counter = 0;

			//#if 0
			/* cause a data storage violation: */
			beef = (uint32 *)0;
			*beef = 0L;
			//#endif

			IDOS->Delay(10);

			printf("counter = %d\n", idata->counter);

			/* Remember to restore the old interrupt vector, or you will die ;-) */
			IExec->SetIntVector(trapnumber, idata->oldinterrupt);
			}

			IExec->FreeSysObject(ASOT_INTERRUPT, interrupt);
			IExec->FreeMem (idata, sizeof (struct IData));

			return 0;
			}

Steven Solie: /* Author */

2012-04-24T15:51:41Z

Author

← Older revision		Revision as of 15:51, 24 April 2012
Line 1:		Line 1:
	== Author ==		== Author ==
	by Alfkil Wennermark<br/>		Alfkil Wennermark<br/>
	Copyright (c) 2010 Alfkil Wennermark		Copyright (c) 2010 Alfkil Wennermark<br/>
	Used by permission.		Used by permission.

Steven Solie: /* Author */

2012-04-24T15:51:22Z

Author

← Older revision		Revision as of 15:51, 24 April 2012
Line 2:		Line 2:
	by Alfkil Wennermark<br/>		by Alfkil Wennermark<br/>
	Copyright (c) 2010 Alfkil Wennermark		Copyright (c) 2010 Alfkil Wennermark
			Used by permission.

	== Article ==		== Article ==

Steven Solie: Created page with "== Author == by Alfkil Wennermark
Copyright (c) 2010 Alfkil Wennermark == Article == I was looking for a way to install a genuine hw interrupt, and this code is the pro..."

2012-04-24T15:51:09Z

New page

== Author ==
by Alfkil Wennermark<br/>
Copyright (c) 2010 Alfkil Wennermark

== Article ==

I was looking for a way to install a genuine hw interrupt, and this code is the proper way to do so. Thanks to Steven Solie, Thomas Frieden, Jörg Strohmayer and Colin Wenzel.

When trying to install an exec interrupt handler, I quickly realised, that the IExec->AddIntServer didn't really do the job. All the trapnumbers defined in exec/interrupts.h will make this function fail, except for TRAPNUM_ILLEGAL_INSTRUCTION, that has no relevance on ppc machines.

After some (a lot of) guidance from the real people, I have come up with this example, that uses SetIntVector to install a global interrupt handler for that particular interrupt. Beware, when you use SetIntVector, you _have to_ manually call the old interrupt handler (returned from SetIntVector) if you don't want your entire system to go boom!

Also, if you are trying to catch exceptions from a specific task (eg. for debugging purposes) you should use the AddDebugHook function from the exec debug interface (more on this in a future article).

Here is the example:

How to install a hardware interrupt - Revision history

Costel Mincea: Text replacement - "" to ""

Alexandre Balaban: Categorized into Debug

Steven Solie: /* Tutorial */

Steven Solie: /* Article */

Steven Solie: /* Article */

Steven Solie: /* Article */

Steven Solie: /* Author */

Steven Solie: /* Author */

Steven Solie: Created page with "== Author == by Alfkil Wennermark Copyright (c) 2010 Alfkil Wennermark == Article == I was looking for a way to install a genuine hw interrupt, and this code is the pro..."

Steven Solie: Created page with "== Author == by Alfkil Wennermark
Copyright (c) 2010 Alfkil Wennermark == Article == I was looking for a way to install a genuine hw interrupt, and this code is the pro..."