Hacker Finds Hidden 'God Mode' on Old x86 CPUs

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Cpuswe



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PostPosted: Fri Aug 10, 2018 1:32 am    Post subject: Hacker Finds Hidden 'God Mode' on Old x86 CPUs Reply with quote

https://www.tomshardware.com/news/x86-hidden-god-mode,37582.html
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CPUShack



Joined: 16 Jun 2003
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PostPosted: Fri Aug 10, 2018 2:35 am    Post subject: Reply with quote

Ha, that's very interesting, Its not exactly a hidden RISC core though, VIA has documented RISC mode in the C3 datasheets (it can run as x86 or in the pure native RISC)
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CPUShack



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PostPosted: Sat Aug 11, 2018 10:00 pm    Post subject: Reply with quote



Not exactly hidden LOL

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debs3759



Joined: 18 Jan 2006
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PostPosted: Sat Aug 11, 2018 10:45 pm    Post subject: Reply with quote

What datasheet is that in? Is it available as a PDF anywhere? Does it contain details of the alternate instructions? I'd be interested in playing around with it Smile
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CPUShack



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PostPosted: Sat Aug 11, 2018 10:54 pm    Post subject: Reply with quote

I think I sent you a copy back in march haha
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debs3759



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PostPosted: Sat Aug 11, 2018 10:57 pm    Post subject: Reply with quote

I don't remember that, and it's not with my other VIA docs. What is it called, so I can search my drives?
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CPUShack



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PostPosted: Sun Aug 12, 2018 12:02 am    Post subject: Reply with quote

VIA C3 AIS Reference and VIA C3 AIS Appnote
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stamasd



Joined: 05 Jun 2014
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PostPosted: Mon Aug 13, 2018 9:21 pm    Post subject: Reply with quote

LOL I was just about to post this bit it's done already.
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Cpuswe



Joined: 15 Mar 2005
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PostPosted: Tue Aug 14, 2018 1:32 am    Post subject: Reply with quote

Well "...finds hidden god mode" sounds better than "...reads a data sheet" Smile
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g0b



Joined: 18 Jul 2006
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PostPosted: Tue Aug 14, 2018 2:43 am    Post subject: Reply with quote

Yeah, but it also means nobody ever read the datasheet of Via C3 since 15 years Smile
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