Re: [tip:x86/microcode] x86/microcode_intel_early.c: Early updateucode on Intel's CPU

From: H. Peter Anvin
Date: Mon Dec 17 2012 - 18:12:58 EST

On 12/17/2012 02:47 PM, Yinghai Lu wrote:

Peter, can you check that branch again?

I moved the early_trap_init after init_mem_mapping.
so for 64bit native, init_mem_mapping will setup page table for ram from blank.

Looks better, at first glance at least. There are a couple of unnecessary changes (the counter in head_64.S cannot exceed 32 bits once computed, so the change from %rcx to %ecx change is pointless.)

There is another bug in my patch: it either needs to mask off the NX bit if we are running on non-NX-enabled hardware, or it needs to not set the NX bit (which is mostly okay that early on, I suspect.)


H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.

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