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The PEI flavor of the ArmMmuLib will install a HOB that exposes its implementation of the special helper routine that is used to update live entries, so that other instantiations of ArmMmuLib can invoke it. This is needed to ensure that splitting page tables using break-before-make (BBM) does not unmap the code that is performing the split. However, the BASE variety of ArmMmuLib discovers the HOB and sets a global pointer to refer to it, which is not possible in PEIMs, and so all PEIMs must use the PEI variety of this library if one does. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: Leif Lindholm <quic_llindhol@quicinc.com>