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Commit7ca801d("[efi] Use the EFI_RNG_PROTOCOL as an entropy source if available") added EFI_RNG_PROTOCOL as an alternative entropy source via an ad-hoc mechanism specific to efi_entropy.c. Split out EFI_RNG_PROTOCOL to a separate entropy source, and allow the entropy core to handle the selection of RDRAND, EFI_RNG_PROTOCOL, or timer ticks as the active source. The fault detection logic added in commita87537d("[efi] Detect and disable seriously broken EFI_RNG_PROTOCOL implementations") may be removed completely, since the failure will already be detected by the generic ANS X9.82-mandated repetition count test and will now be handled gracefully by the entropy core. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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