From 6dfb428f1066f02b6fe8181c81da1b062c430665 Mon Sep 17 00:00:00 2001
From: hygonsoc <45824512+hygonsoc@users.noreply.github.com>
Date: Fri, 21 Dec 2018 06:33:16 +0800
Subject: 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.
---
 cpu.cpp | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

(limited to 'cpu.cpp')

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))
-- 
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