[coreboot-gerrit] Patch merged into coreboot/master: riscv: get SBI calls to work

the following patch was just integrated into master:
commit 6f3a53b6f61126f05db950e1c0a2c0b4f1552e5f
Author: Ronald G. Minnich 
Date:   Sun Jan 15 17:40:51 2017 +0100

riscv: get SBI calls to work

SBI calls, as it turned out, were never right.
    They did not set the stack correctly on traps.
    They were not correctly setting the MIP instead of the SIP
    (although this was not really well documented).
    On Harvey, we were trying to avoid using them,
    and due to a bug in SPIKE, our avoidance worked.
    Once SPIKE was fixed, our avoidance broke.

This set of changes is tested and working with Harvey
    which, for the first time, is making SBI calls.

It's not pretty and we're going to want to rework
    trap_util.S in coming days.

Change-Id: Ibef530adcc58d33e2c44ff758e0b7d2acbdc5e99
    Signed-off-by: Ronald G. Minnich 
    Signed-off-by: Jonathan Neuschäfer 
    Reviewed-on: https://review.coreboot.org/18097
    Tested-by: build bot (Jenkins)

See https://review.coreboot.org/18097 for details.

-gerrit