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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)
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