arm: add uart echo app

arm/hal/lib/common/xil_mem.h

@@ -0,0 +1,47 @@
+/******************************************************************************/
+/**
+* Copyright (c) 2015 - 2020 Xilinx, Inc.  All rights reserved.
+* SPDX-License-Identifier: MIT
+******************************************************************************/
+
+/****************************************************************************/
+/**
+* @file xil_mem.h
+*
+* @addtogroup common_mem_operation_api Customized APIs for Memory Operations
+*
+* The xil_mem.h file contains prototype for functions related
+* to memory operations. These APIs are applicable for all processors supported
+* by Xilinx.
+*
+* @{
+* <pre>
+* MODIFICATION HISTORY:
+*
+* Ver   Who      Date     Changes
+* ----- -------- -------- -----------------------------------------------
+* 6.1   nsk      11/07/16 First release.
+* 7.0   mus      01/07/19 Add cpp extern macro
+*
+* </pre>
+*
+*****************************************************************************/
+#ifndef XIL_MEM_H		/* prevent circular inclusions */
+#define XIL_MEM_H		/* by using protection macros */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/************************** Function Prototypes *****************************/
+
+void Xil_MemCpy(void* dst, const void* src, u32 cnt);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* XIL_MEM_H */
+/**
+* @} End of "addtogroup common_mem_operation_api".
+*/