refactor(sgi): move from "sgi" to "neoverse_rd"

Currently, reference design platforms such as RD-N2, RD-N1-Edge,
RD-V1-MC, RD-V1 and SGI-575 utilize "css/sgi" as the common source
directory. The "sgi" prefix originated from the System Guidance for
Infrastructure (SGI) and was initially associated with the SGI-575
platform. However, subsequent platforms released were under the Neoverse
Reference Design product name.

To align with the Neoverse Reference Design nomenclature, rename the
common source directory from "css/sgi" to "css/neoverse_rd" and update
all file prefixes from "sgi" to "nrd."

Signed-off-by: Rohit Mathew <Rohit.Mathew@arm.com>
Change-Id: I3dcbb31b9ab202e82caf25218ba33c520dcea4e4
diff --git a/plat/arm/css/neoverse_rd/include/nrd_soc_css_def.h b/plat/arm/css/neoverse_rd/include/nrd_soc_css_def.h
new file mode 100644
index 0000000..7c1f5ae
--- /dev/null
+++ b/plat/arm/css/neoverse_rd/include/nrd_soc_css_def.h
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2022-2024, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef NRD_SOC_CSS_DEF_H
+#define NRD_SOC_CSS_DEF_H
+
+#include <lib/utils_def.h>
+#include <plat/arm/board/common/v2m_def.h>
+#include <plat/arm/soc/common/soc_css_def.h>
+#include <plat/common/common_def.h>
+
+/*
+ * Definitions common to all ARM CSSv1-based development platforms
+ */
+
+/* Platform ID address */
+#define BOARD_CSS_PLAT_ID_REG_ADDR		UL(0x7ffe00e0)
+
+/* Platform ID related accessors */
+#define BOARD_CSS_PLAT_ID_REG_ID_MASK		0x0f
+#define BOARD_CSS_PLAT_ID_REG_ID_SHIFT		0x0
+#define BOARD_CSS_PLAT_TYPE_EMULATOR		0x02
+
+#ifndef __ASSEMBLER__
+
+#include <lib/mmio.h>
+
+#define BOARD_CSS_GET_PLAT_TYPE(addr)					\
+	((mmio_read_32(addr) & BOARD_CSS_PLAT_ID_REG_ID_MASK)		\
+	>> BOARD_CSS_PLAT_ID_REG_ID_SHIFT)
+
+#endif /* __ASSEMBLER__ */
+
+#define MAX_IO_DEVICES			3
+#define MAX_IO_HANDLES			4
+
+/* Reserve the last block of flash for PSCI MEM PROTECT flag */
+#define PLAT_ARM_FLASH_IMAGE_BASE	V2M_FLASH0_BASE
+#define PLAT_ARM_FLASH_IMAGE_MAX_SIZE	(V2M_FLASH0_SIZE - V2M_FLASH_BLOCK_SIZE)
+
+#define PLAT_ARM_NVM_BASE		V2M_FLASH0_BASE
+#define PLAT_ARM_NVM_SIZE		(V2M_FLASH0_SIZE - V2M_FLASH_BLOCK_SIZE)
+
+#endif /* NRD_SOC_CSS_DEF_H */