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List:       eros-arch
Subject:    Charlie's response on resume keys
From:       Jonathan S. Shapiro shap () eros ! cis ! upenn ! edu
Date:       1996-02-25 21:36:45
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It didn't look like this went to the list, so...

From: LANDAU_CHARLES@Tandem.COM
Date: 25 Feb 96 11:26:00 -0800
Message-Id: <199602251127.AA13113@POST.MIS.TANDEM.COM>
To: shap@aurora.cis.upenn.edu
Subject: Quick KeyKOS Question

  >Does a CALL invocation on a kernel key generate a null key (consumed
resume key) in the 4th return slot?

The 4th return slot has whatever the key is specified to return, usually
null.

If you mean the 4th passed slot, it is conceptually treated the same
whether the call was to a kernel key or any other key, namely a resume
key is generated. This resume key will be consumed when the kernel key
returns. But it is optimized, and no key is physically generated.

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