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+# **'ext'** Secureboot Services in Hostboot
+This directory implements additional (or 'extended') secureboot functionality
+ that is not considered part of the 'base' secureboot support.
+
+## Files
+
+* __makefile__
+  * Standard Hostboot makefile
+
+* __phys_presence.C__
+  * Implements the 'physical presence'-related functions, which are used to
+ assert that a system owner is physically present at the site of a system.
+    * This is done by using GPIO devices on the system's power button to
+ capture that the button was physically pressed.
+  * Functions are defined in
+ [phys_presence_if.H](../../../include/usr/secureboot/phys_presence_if.H)
+
+* __[README.md](./README.md)__
+  * This file
+
+* __service_ext.C__
+  * Implements some additional (or 'extended') functionality as defined in
+ [service_ext.H](../../../include/usr/secureboot/service_ext.H)
+