1 files changed, 58 insertions, 0 deletions
diff --git a/OvmfPkg/Bhyve/PlatformPei/Cmos.c b/OvmfPkg/Bhyve/PlatformPei/Cmos.c
new file mode 100644
index 0000000000..9b34e10b17
--- /dev/null
+++ b/OvmfPkg/Bhyve/PlatformPei/Cmos.c
@@ -0,0 +1,58 @@
+/** @file
+  PC/AT CMOS access routines
+
+  Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+
+#include "Cmos.h"
+#include "Library/IoLib.h"
+
+/**
+  Reads 8-bits of CMOS data.
+
+  Reads the 8-bits of CMOS data at the location specified by Index.
+  The 8-bit read value is returned.
+
+  @param  Index  The CMOS location to read.
+
+  @return The value read.
+
+**/
+UINT8
+EFIAPI
+CmosRead8 (
+  IN      UINTN                     Index
+  )
+{
+  IoWrite8 (0x70, (UINT8) Index);
+  return IoRead8 (0x71);
+}
+
+
+/**
+  Writes 8-bits of CMOS data.
+
+  Writes 8-bits of CMOS data to the location specified by Index
+  with the value specified by Value and returns Value.
+
+  @param  Index  The CMOS location to write.
+  @param  Value  The value to write to CMOS.
+
+  @return The value written to CMOS.
+
+**/
+UINT8
+EFIAPI
+CmosWrite8 (
+  IN      UINTN                     Index,
+  IN      UINT8                     Value
+  )
+{
+  IoWrite8 (0x70, (UINT8) Index);
+  IoWrite8 (0x71, Value);
+  return Value;
+}
+