Use the sram/sdram instruction with a sig_done optional token. This won't swap out the context. A wait loop can then be written using the br_!signal instruction. Refer the microcode programmer's reference for details. It even has an example. All this if you are using microcode.

From: Gregory Prier Reply-To: ixp1200@CS.Princeton.EDU To: ixp mailing list Subject: [ixp1200] waiting for memory writes Date: Mon, 18 Nov 2002 15:31:26 -0800 (PST)

Is there any way to get the uengine to wait for a memory write to complete without swapping context? I can swap context and wait for a signal but then other threads have a chance to run, which I don't want to happen. I just want the processor to spin and waste cycles while the write completes. Yes, I know this is inefficient, but it would be a big help right now for debugging.

Thanks for the help. GKP

---------------------------------------------------------------------- Greg Prier Previously: A Mudder 3564 Boelter Hall Currently: A Bruin working UCLA CA 90095 toward a PhD (310) 825-8899 After that: No idea

"Hell, there are no rules here. We're trying to accomplish something." Thomas Edison

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