Add Hygon Dhyana support to enable RDRAND/RDSEED/ADX/AVX2 Feature (PR #765)

Hugh, interesting.

Thank you very much.

Ping @randombit. Botan may want or need this, too.

1 files changed, 9 insertions, 1 deletions

diff --git a/cpu.cpp b/cpu.cpp
index b60ef1df..4dcd5c0c 100644
--- a/cpu.cpp
+++ b/cpu.cpp
@@ -280,6 +280,14 @@ static inline bool IsAMD(const word32 output[4])
 		(output[3] /*EDX*/ == 0x69746E65);

 }

 

+static inline bool IsHygon(const word32 output[4])

+{

+	// This is the "HygonGenuine" string.

+	return (output[1] /*EBX*/ == 0x6f677948) &&

+		(output[2] /*ECX*/ == 0x656e6975) &&

+		(output[3] /*EDX*/ == 0x6e65476e);

+}

+

 static inline bool IsVIA(const word32 output[4])

 {

 	// This is the "CentaurHauls" string. Some non-PadLock's can return "VIA VIA VIA "

@@ -383,7 +391,7 @@ void DetectX86Features()
 			}

 		}

 	}

-	else if (IsAMD(cpuid0))

+	else if (IsAMD(cpuid0) || IsHygon(cpuid0))

 	{

 		CRYPTOPP_CONSTANT(RDRAND_FLAG = (1 << 30))

 		CRYPTOPP_CONSTANT(RDSEED_FLAG = (1 << 18))