Date: Mon, 07 Feb 2005 10:39:05 -0800 From: Nate Lawson <nate@root.org> To: John Baldwin <jhb@FreeBSD.org> Cc: Ian Dowse <iedowse@FreeBSD.org> Subject: Re: cvs commit: src/sys/dev/random probe.c Message-ID: <4207B5C9.4030505@root.org> In-Reply-To: <200502071015.39224.jhb@FreeBSD.org> References: <200502061655.j16GtqDK033151@repoman.freebsd.org> <200502071015.39224.jhb@FreeBSD.org>
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John Baldwin wrote: > On Sunday 06 February 2005 11:55 am, Ian Dowse wrote: > >>iedowse 2005-02-06 16:55:52 UTC >> >> FreeBSD src repository >> >> Modified files: >> sys/dev/random probe.c >> Log: >> Check that we have at least a 586-class CPU before calling do_cpuid(). >> This fixes booting on a number of 486 processors. > > > This is wrong. Some 486's do have cpuid, notable the dx4's (I used to have > one.) The correct test is to see if you can flip a bit in %eflags (can't > remember which one). If that flag stays at zero then you don't have cpuid, > if the bit follows the value written to it then you do have cpuid. That matters little since the cpuid result is then used to check for a VIA part introduced in 2003. -- Nate
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