Date: Sun, 26 Jul 1998 22:12:41 +0100 (BST) From: Doug Rabson <dfr@nlsystems.com> To: zhihuizhang <bf20761@binghamton.edu> Cc: hackers <freebsd-hackers@FreeBSD.ORG> Subject: Re: APTDpde question (pmap) Message-ID: <Pine.BSF.4.01.9807262210260.631-100000@herring.nlsystems.com> In-Reply-To: <Pine.SOL.L3.93.980726155752.23464A-100000@bingsun2>
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On Sun, 26 Jul 1998, zhihuizhang wrote: > > In pmap.c module, we set PTDPTDI entry of the page directory page to point > to itself. So PTDpde and PTmap works well. However, I do not find a > similar setting of APTDTDI (=1023) in pmap.c. My question is how APTDpde > and the alternate address space it's supposed to relate to (APTmap) are > used. (has something to do with pmap copy?) > > Any help is appreciated. I believe that APTD is used to access the ptes of a pmap which is not currently active. The function get_ptbase() sets this up if necessary. -- Doug Rabson Mail: dfr@nlsystems.com Nonlinear Systems Ltd. Phone: +44 181 951 1891 Fax: +44 181 381 1039 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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