cvs commit: src/sys/dev/random probe.c

[John Baldwin]

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.

-- 
John Baldwin <jhb at FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org