SecurityPkg/RngDxe: Add debug warning for NULL PcdCpuRngSupportedAlgorithm

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@arm.com>
Acked-by: Jiewen Yao <jiewen.yao@intel.com>

diff --git a/SecurityPkg/RandomNumberGenerator/RngDxe/AArch64/RngDxe.c b/SecurityPkg/RandomNumberGenerator/RngDxe/AArch64/RngDxe.c
index ceddc8f08a45463448f5a69a934afab9f20cdf90..318876d6933042362dd88d40e8fe29ec800318bb 100644 (file)
--- a/SecurityPkg/RandomNumberGenerator/RngDxe/AArch64/RngDxe.c
+++ b/SecurityPkg/RandomNumberGenerator/RngDxe/AArch64/RngDxe.c
@@ -67,6 +67,16 @@ GetAvailableAlgorithms (
       sizeof (EFI_RNG_ALGORITHM)\r
       );\r
     mAvailableAlgoArrayCount++;\r
+\r
+    DEBUG_CODE_BEGIN ();\r
+    if (IsZeroGuid (PcdGetPtr (PcdCpuRngSupportedAlgorithm))) {\r
+      DEBUG ((\r
+        DEBUG_WARN,\r
+        "PcdCpuRngSupportedAlgorithm should be a non-zero GUID\n"\r
+        ));\r
+    }\r
+\r
+    DEBUG_CODE_END ();\r
   }\r
 \r
   // Raw algorithm (Trng)\r