Date: Fri, 5 Mar 1999 10:41:07 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: Amancio Hasty <hasty@rah.star-gate.com> Cc: Terry Lambert <tlambert@primenet.com>, dyson@iquest.net, dick@tar.com, jplevyak@inktomi.com, hackers@FreeBSD.ORG Subject: Re: lockf and kernel threads Message-ID: <199903051841.KAA49799@apollo.backplane.com> References: <199903051833.KAA82111@rah.star-gate.com>
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:> rings are ring 0 and ring 3. That's it. The intermediate rings are no
:> better then a glorified user mode because most privilaged instructions
:> cannot be run in them.
:
:Thats probably true however for delivery of an AST I don't thing that we
:need priviliged instructions --- I could be wrong.
:
: Amancio
Little things like, ohhhhh disabling interrupts. Accessing the MMU
registers, flushing the TLB, etc..... believe me, ring 1 and ring 2
is utterly useless for anything FreeBSD wants to run in supervisor mode.
Matthew Dillon
<dillon@backplane.com>
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