[ixp1200] waiting for memory writes

[Shyamal Pandya]

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 <greg at Lever.cs.ucla.edu>
>Reply-To: ixp1200 at CS.Princeton.EDU
>To: ixp mailing list <ixp1200 at CS.Princeton.EDU>
>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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