.. _libc_uefi_usage:

===================
Using libc for UEFI
===================

Using the UEFI C library
========================

Once you have finished :ref:`building<libc_uefi_building>` the UEFI C library
it can be used to run libc or libm functions inside of UEFI Images. Currently,
not all C standard functions are supported in UEFI. Consult the :ref:`list of
supported functions<libc_uefi_support>` for a comprehensive list.

.. note::
   LLVM-libc support for UEFI is currently in the early bring-up phase. For
   the current source of truth on implemented functions, please refer to
   ``libc/config/uefi/entrypoints.txt`` in the source tree.