Date: Fri, 06 Aug 2004 11:29:57 +0300 From: Ville-Pertti Keinonen <will+freebsd-current@will.iki.fi> To: Bruce M Simpson <bms@spc.org> Cc: Tim Robbins <tjr@freebsd.org> Subject: Re: Atomic operations on i386/amd64 Message-ID: <41134185.1090105@will.iki.fi> In-Reply-To: <20040806023055.GC20148@empiric.icir.org> References: <20040805050422.GA41201@cat.robbins.dropbear.id.au> <200408051759.53079.jhb@FreeBSD.org> <4112B184.8010303@samsco.org> <20040806023055.GC20148@empiric.icir.org>
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Bruce M Simpson wrote: >Have a look at Linux. They ended up doing a runtime self-modifying kernel >hack so they could ship generic kernels which used the appropriate locking >instructions on each x86 family CPU. > > The idea of using self-modification to select locking modes (although for optional preemption, SMP and debugging rather than CPU model) is also described in a DEC Technical Journal article: http://research.compaq.com/wrl/DECarchives/DTJ/DTJF03/DTJF03SC.TXT I'm not sure whether the Linux implementation uses the same technique.
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