1 files changed, 64 insertions, 0 deletions
diff --git a/src/pal/src/arch/amd64/processor.cpp b/src/pal/src/arch/amd64/processor.cpp
new file mode 100644
index 0000000000..ac3d448a81
--- /dev/null
+++ b/src/pal/src/arch/amd64/processor.cpp
@@ -0,0 +1,64 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+/*++
+
+
+
+Module Name:
+
+    processor.cpp
+
+Abstract:
+
+    Implementation of processor related functions for the Intel x86/x64
+    platforms. These functions are processor dependent.
+
+
+
+--*/
+
+#include "pal/palinternal.h"
+
+/*++
+Function:
+YieldProcessor
+
+The YieldProcessor function signals to the processor to give resources
+to threads that are waiting for them. This macro is only effective on
+processors that support technology allowing multiple threads running
+on a single processor, such as Intel's Hyper-Threading technology.
+
+--*/
+void
+PALAPI
+YieldProcessor(
+    VOID)
+{
+    __asm__ __volatile__ (
+        "rep\n"
+        "nop"
+    );
+}
+
+/*++
+Function:
+XmmYmmStateSupport
+
+Check if OS has enabled both XMM and YMM state support
+
+Return value:
+1 if XMM and YMM are enabled, 0 otherwise
+--*/
+extern "C" unsigned int XmmYmmStateSupport()
+{
+    unsigned int eax;
+    __asm("  xgetbv\n" \
+        : "=a"(eax) /*output in eax*/\
+        : "c"(0) /*inputs - 0 in ecx*/\
+        : "eax", "edx" /* registers that are clobbered*/
+      );
+    // Check OS has enabled both XMM and YMM state support
+    return ((eax & 0x06) == 0x06) ? 1 : 0;
+}