Am 15.08.2018 um 14:48 schrieb Konstantin Belousov:
Author: kib
Date: Wed Aug 15 12:48:49 2018
New Revision: 337838
URL: https://svnweb.freebsd.org/changeset/base/337838
Log:
Fix early EFIRT on PCID machines after r337773.
Ensure that the valid PCID state is created for proc0 pmap, since it
might be used by efirt enter() before first context switch on the BSP.
Sponsored by: The FreeBSD Foundation
MFC after: 6 days
Modified:
head/sys/amd64/amd64/pmap.c
Hello,
I'm testing ALPHA4 on a Ivy bridge machine, without recent firmware
update, so no PCID.
This fix doesn't cover that hardware.
Setting efi.rt.disabled=1 in loader.conf makes it bootable.
Without this tweak, the following panic happens:
Fatal trap 12: Page fault while in kernel mode
:
cpuid = 5; apic id = 05
:
fault code: supervisor read data, page not present.
:
Stopped at 0xbed7143d calll *ll+0x27(%rax)
Unfortunately keyboard doesn't work and no serial connection easily
possible.
But I'll be able to connect a serail console if more info is
needed/useful, please tell me!
-harry
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