lib: generic: xlnx: Enable CMake handling for System Device Tree Flow

For AMD-Xilinx tooling, there is a new System Device Tree  (SDT) BSP
with different symbols for GIC than the classic BSP. This causes issues
when linking Libmetal against the SDT Flow BSP. Note that there is a
planned deprecation of the classic BSP.

For AMD-Xilinx System Device Tree (SDT) Flow, one of the files provided
by BSP is bspconfig.h. This file provides reference to the symbols that
describe GIC Device ID and GIC distributor Base Address. AMD-Xilinx
tools that use the SDT Flow BSP will provide symbol 'SDT' to signal that
the SDT Flow BSP is present. If SDT symbol is present then the Libmetal
build will include the new header "lib/system/generic/xlnx/sdt.h" to
preserve library build.

Signed-off-by: Ben Levinsky <ben.levinsky@amd.com>

lib/system/generic/xlnx/CMakeLists.txt

@@ -8,4 +8,8 @@ collect (PROJECT_LIB_HEADERS sys.h)
 
 collect (PROJECT_LIB_SOURCES irq.c)
 
-# vim: expandtab:ts=2:sw=2:smartindent
+include(CheckSymbolExists)
+check_symbol_exists(SDT "bspconfig.h" HAS_SYSTEM_DT)
+if (HAS_SYSTEM_DT)
+  collect (PROJECT_LIB_HEADERS sys_devicetree.h)
+endif()

lib/system/generic/xlnx/sys.h

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2015, Xilinx Inc. and Contributors. All rights reserved.
+ * Copyright (C) 2023, Advanced Micro Devices, Inc.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -28,6 +29,10 @@
 #include <xil_exception.h>
 #include <xparameters.h>
 
+#ifdef SDT
+#include <metal/system/generic/xlnx/sys_devicetree.h>
+#endif
+
 #ifndef __METAL_GENERIC_XLNX_SYS__H__
 #define __METAL_GENERIC_XLNX_SYS__H__
 

lib/system/generic/xlnx/sys_devicetree.h

@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2022-2023 Advanced Micro Devices, Inc. All Rights Reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/*
+ * @file	generic/xlnx/sys_devicetree.h
+ * @brief	Xilinx-AMD Specific symbols for System Device Tree Flow
+ */
+
+#ifndef __METAL_GENERIC_SYS_XLNX_SYS_DEVICETREE_H__
+#define __METAL_GENERIC_SYS_XLNX_SYS_DEVICETREE_H__
+
+/* The Xilinx-AMD System Device Tree (SDT) Flow BSP provides this file. */
+#include "bspconfig.h"
+
+#ifndef XPAR_SCUGIC_0_DEVICE_ID
+#define XPAR_SCUGIC_0_DEVICE_ID XPAR_SCUGIC_SINGLE_DEVICE_ID
+#endif
+
+#ifndef XPAR_SCUGIC_0_DIST_BASEADDR
+#define XPAR_SCUGIC_0_DIST_BASEADDR XPAR_SCUGIC_DIST_BASEADDR
+#endif
+#endif /* __METAL_GENERIC_SYS_XLNX_SYS_DEVICETREE_H__ */