1 files changed, 36 insertions, 0 deletions
diff --git a/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseLib/Ia32/ReadMm1.c b/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseLib/Ia32/ReadMm1.c
new file mode 100644
index 00000000..e161bce4
--- /dev/null
+++ b/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseLib/Ia32/ReadMm1.c
@@ -0,0 +1,36 @@
+/** @file
+  AsmReadMm1 function
+
+  Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+
+
+
+/**
+  Reads the current value of 64-bit MMX Register #1 (MM1).
+
+  Reads and returns the current value of MM1. This function is only available
+  on IA-32 and x64.
+
+  @return The current value of MM1.
+
+**/
+UINT64
+EFIAPI
+AsmReadMm1 (
+  VOID
+  )
+{
+  _asm {
+    push    eax
+    push    eax
+    movq    [esp], mm1
+    pop     eax
+    pop     edx
+    emms
+  }
+}
+