soc/intel/common: Add support to configure top swap feature

RTC BUC control register provides a software interface to
configure the top swap feature. This patch adds implementation
to enable/disable top swap feature and gets it accessible in
romstage as well.
The top swap control functions are exposed only if INTEL_HAS_TOP_SWAP
is selected.

To use the topswap feature a second bootblock has to be added
to the cbfs. Below configs aid in doing that,
INTEL_HAS_TOP_SWAP
INTEL_ADD_TOP_SWAP_BOOTBLOCK
INTEL_TOP_SWAP_BOOTBLOCK_SIZE

Enabling and Disabling topswap, using the added API enables user
to boot alternatively from either bootblock.

Change-Id: Iea31b891f81e76d4d623fcb68183c3ad3dcadbad
Signed-off-by: Aamir Bohra <aamir.bohra@intel.com>
Signed-off-by: Rizwan Qureshi <rizwan.qureshi@intel.com>
Reviewed-on: https://review.coreboot.org/25805
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

0 files changed, 0 insertions, 0 deletions