soc/intel/common/fast_spi: Add Lockdown of extended BIOS region

This change adds support to Lock down the configuration of
extended BIOS region. This is done as part of
fast_spi_lockdown_cfg() so that it is consistent with the
other lockdown.

Change includes:
1. New helper function fast_spi_lock_ext_bios_cfg() added that
will basically set EXT_BIOS_LOCK.

BUG=b:171534504

Signed-off-by: Srinidhi N Kaushik <srinidhi.n.kaushik@intel.com>
Change-Id: I730fc12a9c5ca8bb4a1f946cad45944dda8e0518
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48068
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/soc/intel/common/block/include/intelblocks/fast_spi.h b/src/soc/intel/common/block/include/intelblocks/fast_spi.h
index e3ffa6a39a..e742a27a42 100644
--- a/src/soc/intel/common/block/include/intelblocks/fast_spi.h
+++ b/src/soc/intel/common/block/include/intelblocks/fast_spi.h
@@ -23,6 +23,10 @@ void fast_spi_set_bios_interface_lock_down(void);
  */
 void fast_spi_set_lock_enable(void);
 /*
+ * Set FAST_SPIBAR BIOS Control Ext Bios LE bit.
+ */
+void fast_spi_set_ext_bios_lock_enable(void);
+/*
  * Set FAST_SPIBAR BIOS Control EISS bit.
  */
 void fast_spi_set_eiss(void);