From: Pierre Gondois <pierre.gondois@...>

PcdCpuRngSupportedAlgorithm should allow to identify the the algorithm
used by the RNDR CPU instruction to generate a random number.
Add a debug warning if the Pcd is not set.

Signed-off-by: Pierre Gondois <pierre.gondois@...>
---
.../RandomNumberGenerator/RngDxe/AArch64/RngDxe.c | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/SecurityPkg/RandomNumberGenerator/RngDxe/AArch64/RngDxe.c b/=
SecurityPkg/RandomNumberGenerator/RngDxe/AArch64/RngDxe.c
index f5910e3b999f..0d853720ecb1 100644
--- a/SecurityPkg/RandomNumberGenerator/RngDxe/AArch64/RngDxe.c
+++ b/SecurityPkg/RandomNumberGenerator/RngDxe/AArch64/RngDxe.c
@@ -67,6 +67,16 @@ GetAvailableAlgorithms (
sizeof (EFI_RNG_ALGORITHM)
);
mAvailableAlgoArrayCount++;
+
+ DEBUG_CODE_BEGIN ();
+ if (IsZeroGuid (PcdGetPtr (PcdCpuRngSupportedAlgorithm))) {
+ DEBUG ((
+ DEBUG_WARN,
+ "PcdCpuRngSupportedAlgorithm should be a non-zero GUID\n"
+ ));
+ }
+
+ DEBUG_CODE_END ();
}
=20
// Raw algorithm (Trng)
--=20
2.25.1