Date: Sat, 26 Apr 1997 04:35:09 +1000 From: Bruce Evans <bde@zeta.org.au> To: peter@spinner.dialix.com, smp@csn.net Cc: freebsd-smp@freebsd.org, nishio@caleche.kecl.ntt.co.jp Subject: Re: Tyan ATX1668 problem -- success Message-ID: <199704251835.EAA09113@godzilla.zeta.org.au>
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>Now that it works I can remove the ipi_hits counter, am I correct in believing >that the load of %ds with the kernel selector will still be necessary to >address the apic[] for the EOI? No, you can access everything using %ss in assembler - you pay for loading %ss for traps to inner privilege whether you want to or not. However, prefixes may cost a cycle or two, so it is better to load %ds if you want to do more than a few memory accesses. Bruce
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