diff --git a/plat/mediatek/common/custom/oem_svc.h b/plat/mediatek/common/custom/oem_svc.h
new file mode 100644
index 0000000..3b15e15
--- /dev/null
+++ b/plat/mediatek/common/custom/oem_svc.h
@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * Neither the name of ARM nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __OEM_SVC_H__
+#define __OEM_SVC_H__
+
+/*******************************************************************************
+ * Defines for runtime services func ids
+ ******************************************************************************/
+/*
+ * Number of OEM calls (above) implemented.
+ */
+#define OEM_SVC_NUM_CALLS		3
+
+/*******************************************************************************
+ * Defines for OEM Service queries
+ ******************************************************************************/
+/* 0x83000000 - 0x8300FEFF is OEM service calls */
+#define OEM_SVC_CALL_COUNT		0x8300ff00
+#define OEM_SVC_UID			0x8300ff01
+/* 0x8300ff02 is reserved */
+#define OEM_SVC_VERSION			0x8300ff03
+/* 0x8300ff04 - 0x8300FFFF is reserved for future expansion */
+
+/* OEM Service Calls version numbers */
+#define OEM_VERSION_MAJOR		0x0
+#define OEM_VERSION_MINOR		0x1
+
+/* The macros below are used to identify OEM calls from the SMC function ID */
+/* SMC32 ID range from 0x83000000 to 0x83000FFF */
+/* SMC64 ID range from 0xC3000000 to 0xC3000FFF */
+#define OEM_FID_MASK			0xf000u
+#define OEM_FID_VALUE			0u
+#define is_oem_fid(_fid) \
+	(((_fid) & OEM_FID_MASK) == OEM_FID_VALUE)
+
+#define OEM_SVC_E_SUCCESS		0
+#define OEM_SVC_E_NOT_SUPPORTED		-1
+#define OEM_SVC_E_INVALID_PARAMS	-2
+
+#endif /* __OEM_SVC_H__ */