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[efi] Split out EFI_RNG_PROTOCOL as a separate entropy source

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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>
This commit is contained in:
Michael Brown
2023-02-20 14:08:49 +00:00
parent 7d71cf318a
commit 471599dc77
5 changed files with 130 additions and 92 deletions
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src/include/ipxe/errfile.h
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@@ -403,6 +403,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#define ERRFILE_pci_cmd ( ERRFILE_OTHER | 0x00590000 )
#define ERRFILE_dhe ( ERRFILE_OTHER | 0x005a0000 )
#define ERRFILE_efi_cmdline ( ERRFILE_OTHER | 0x005b0000 )
#define ERRFILE_efi_rng ( ERRFILE_OTHER | 0x005c0000 )
/** @} */