From mboxrd@z Thu Jan 1 00:00:00 1970 MIME-Version: 1.0 In-Reply-To: <0868ffccbf093ea38926848da39b9145@ladd.quanstro.net> References: <0868ffccbf093ea38926848da39b9145@ladd.quanstro.net> Date: Tue, 6 Oct 2009 11:16:57 -0700 Message-ID: <13426df10910061116x2bb97144vc0d290ece980596c@mail.gmail.com> From: ron minnich To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Subject: Re: [9fans] /sys/include/ip.h 5c(1) Topicbox-Message-UUID: 81d6f808-ead5-11e9-9d60-3106f5b1d025 On Tue, Oct 6, 2009 at 11:06 AM, erik quanstrom wro= te: > the one that you didn't mention is the one that bothers me: smm mode. > this has been around for a very long time. =A0smm mode takes a special > interrupt and takes over the cpu and runs some real-mode code. =A0things > like ps/2 emulation for usb mice and keyboards rely on smm mode. > this can really blow up your timing, if you have timing constraints. don't worry, SMM mode is going to keep getting more and more heavily used. Oh, wait, that's a bad thing. oh well. ron