18 Sep
2015
18 Sep
'15
9:13 a.m.
On 09/17/2015 11:19 PM, Guy Sotomayor wrote:
On 9/17/15 8:55 PM, Jon Elson wrote:
OK, thanks, I knew there was this patch RAM, but didn't know
the purpose.
Jon
I think the later X86 machines have a tiny block of patch
microcode that is available to the OS to put special
routines into.
Certainly not Intel CPUs. All of the microcode patches
are loaded via special instruction sequences
(described in the SDM). The microcode patch RAM is in the
CPU and not visible to S/W.