commit 471599dc7721d454b6658062c901b52038a78be2
author Michael Brown <mcb30@ipxe.org> Mon Feb 20 14:08:49 2023 +0000
committer Michael Brown <mcb30@ipxe.org> Mon Feb 20 14:53:10 2023 +0000
tree 4829951380f8701b5909a9192e2e0678fe37a36d
parent 7d71cf318a2a6fedde7aaf9303b1cdec0cf51660

[efi] Split out EFI_RNG_PROTOCOL as a separate entropy source

Commit 7ca801d ("[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 commit a87537d ("[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>