cvs commit: src/sys/dev/random probe.c
iedowse at maths.tcd.ie
Mon Feb 7 10:23:38 PST 2005
In message <200502071015.39224.jhb at FreeBSD.org>, John Baldwin writes:
>On Sunday 06 February 2005 11:55 am, Ian Dowse wrote:
>> 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.
Indeed - it's just a quick workaround that I'll fix when you find
me a 486 with a Nehemiah random number generator ;-)
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