Subject: [Xen-ia64-devel] Why is cpl read as 0 in
para-virtualization ?
while I was modifying xen_early_setup, I tried to replace dcr
kludge using
cpl. Unfortunatly, it doesn't work since cpl is read as 0
(see vcpu.c).
So my question is simple: why ?
I think some places in
Le Mercredi 01 Mars 2006 16:44, Magenheimer, Dan (HP Labs Fort Collins) a
écrit :
Subject: [Xen-ia64-devel] Why is cpl read as 0 in
para-virtualization ?
while I was modifying xen_early_setup, I tried to replace dcr
kludge using
cpl. Unfortunatly, it doesn't work since cpl is read as
From: Magenheimer, Dan (HP Labs Fort Collins)
Sent: 2006年3月2日 1:01
I think some places in Linux/ia64 determine whether code
is running in kernel or user mode by checking psr.cpl.
Correct.
One place is user_mode() is ptrace.h.
Currently it is true if cpl != 0. I have made a simple test:
