linux-stable.git/arch/powerpc/kernel/cpu_setup_power.S, branch v3.9.7

powerpc/power8: Fix secondary CPUs hanging on boot for HV=0

2013-05-08T03:33:03+00:00

commit 8c2a381734fc9718f127f4aba958e8a7958d4028 upstream.

In __restore_cpu_power8 we determine if we are HV and if not, we return
before setting HV only resources.

Unfortunately we forgot to restore the link register from r11 before
returning.

This will happen on boot and with secondary CPUs not coming online.

This adds the missing link register restore.

Signed-off-by: Michael Neuling 
Signed-off-by: Benjamin Herrenschmidt 
Signed-off-by: Greg Kroah-Hartman

powerpc: Set DSCR bit in FSCR setup

2013-03-05T05:56:30+00:00

We support DSCR (Data Stream Control Register) so we should make sure we set it
in the FSCR (Facility Status & Control Register) incase some firmwares don't
set it.  If we don't set this, we'll take a facility unavailable exception when
using the DSCR.

Signed-off-by: Michael Neuling 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Fix setting FSCR for HV=0 and on secondary CPUs

2013-03-05T05:56:29+00:00

Currently we only set the FSCR (Facility Status and Control Register) when HV=1
but this feature is available when HV=0 also.  This patch sets FSCR when HV=0.

Also, we currently only set the FSCR on the master CPU.  This patch also sets
the FSCR on secondary CPUs.

Signed-off-by: Michael Neuling 
cc: Ian Munsie 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Add support for context switching the TAR register

2013-02-08T03:05:50+00:00

This patch adds support for enabling and context switching the Target
Address Register in Power8. The TAR is a new special purpose register
that can be used for computed branches with the bctar[l] (branch
conditional to TAR) instruction in the same manner as the count and link
registers.

Signed-off-by: Ian Munsie 
Signed-off-by: Matt Evans 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Setup relocation on exceptions for bare metal systems

2012-11-15T04:08:06+00:00

This turns on MMU on execptions via AIL field in the LPCR.

Signed-off-by: Matt Evans 
Signed-off-by: Michael Neuling 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Move initial mfspr LPCR out of __init_LPCR

2012-11-15T04:08:05+00:00

We want to change what's initially set in the LPCR, so start by taking the move
from LPCR out of the function and into the caller.

Signed-off-by: Matt Evans 
Signed-off-by: Michael Neuling 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Add POWER8 setup code

2012-11-15T02:00:42+00:00

Just a copy of POWER7 for now.  Will update with new code later.

Signed-off-by: Michael Neuling 
Signed-off-by: Benjamin Herrenschmidt

powerpc: make POWER7 setup code name generic

2012-11-15T02:00:39+00:00

We are going to reuse this in POWER8 so make the name generic.

Signed-off-by: Michael Neuling 
Signed-off-by: Benjamin Herrenschmidt