diff --git a/include/plat/arm/common/arm_pas_def.h b/include/plat/arm/common/arm_pas_def.h
new file mode 100644
index 0000000..a8ebee3
--- /dev/null
+++ b/include/plat/arm/common/arm_pas_def.h
@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2021, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+#ifndef ARM_PAS_DEF_H
+#define ARM_PAS_DEF_H
+
+#include <plat/arm/common/arm_def.h>
+
+/*****************************************************************************
+ * PAS regions used to initialize the Granule Protection Table (GPT)
+ ****************************************************************************/
+
+/*
+ * The PA space is initially mapped in the GPT as follows:
+ *
+ * ============================================================================
+ * Base Addr| Size        |L? GPT|PAS   |Content                 |Comment
+ * ============================================================================
+ * 0GB      | 1GB         |L0 GPT|ANY   |TBROM (EL3 code)        |Fixed mapping
+ *          |             |      |      |TSRAM (EL3 data)        |
+ *          |             |      |      |IO (incl.UARTs & GIC)   |
+ * ----------------------------------------------------------------------------
+ * 1GB      | 1GB         |L0 GPT|ANY   |IO                      |Fixed mapping
+ * ----------------------------------------------------------------------------
+ * 2GB      | 1GB         |L1 GPT|NS    |DRAM (NS Kernel)        |Use T.Descrip
+ * ----------------------------------------------------------------------------
+ * 3GB      |1GB-64MB     |L1 GPT|NS    |DRAM (NS Kernel)        |Use T.Descrip
+ * ----------------------------------------------------------------------------
+ * 4GB-64MB |64MB-32MB    |      |      |                        |
+ *          | -4MB        |L1 GPT|SECURE|DRAM TZC                |Use T.Descrip
+ * ----------------------------------------------------------------------------
+ * 4GB-32MB |             |      |      |                        |
+ * -3MB-1MB |32MB         |L1 GPT|REALM |RMM                     |Use T.Descrip
+ * ----------------------------------------------------------------------------
+ * 4GB-3MB  |             |      |      |                        |
+ * -1MB     |3MB          |L1 GPT|ROOT  |EL3 DRAM data           |Use T.Descrip
+ * ----------------------------------------------------------------------------
+ * 4GB-1MB  |1MB          |L1 GPT|ROOT  |DRAM (L1 GPTs, SCP TZC) |Fixed mapping
+ * ============================================================================
+ *
+ * - 4KB of L0 GPT reside in TSRAM, on top of the CONFIG section.
+ * - ~1MB of L1 GPTs reside at the top of DRAM1 (TZC area).
+ * - The first 1GB region has GPI_ANY and, therefore, is not protected by
+ *   the GPT.
+ * - The DRAM TZC area is split into three regions: the L1 GPT region and
+ *   3MB of region below that are defined as GPI_ROOT, 32MB Realm region
+ *   below that is defined as GPI_REALM and the rest of it is defined as
+ *   GPI_SECURE.
+ */
+
+/* TODO: This might not be the best way to map the PAS */
+
+/* Device memory 0 to 2GB */
+#define ARM_PAS_1_BASE			(U(0))
+#define ARM_PAS_1_SIZE			((ULL(1)<<31)) /* 2GB */
+
+/* NS memory 2GB to (end - 64MB) */
+#define ARM_PAS_2_BASE			(ARM_PAS_1_BASE + ARM_PAS_1_SIZE)
+#define ARM_PAS_2_SIZE			(ARM_NS_DRAM1_SIZE)
+
+/* Secure TZC region */
+#define ARM_PAS_3_BASE			(ARM_AP_TZC_DRAM1_BASE)
+#define ARM_PAS_3_SIZE			(ARM_AP_TZC_DRAM1_SIZE)
+
+#define ARM_PAS_GPI_ANY			MAP_GPT_REGION(ARM_PAS_1_BASE,	   \
+						       ARM_PAS_1_SIZE,	   \
+						       GPI_ANY)
+#define	ARM_PAS_KERNEL			MAP_GPT_REGION_TBL(ARM_PAS_2_BASE, \
+							   ARM_PAS_2_SIZE, \
+							   GPI_NS)
+
+#define ARM_PAS_TZC			MAP_GPT_REGION_TBL(ARM_PAS_3_BASE, \
+							   ARM_PAS_3_SIZE, \
+							   GPI_SECURE)
+
+#define ARM_PAS_REALM			MAP_GPT_REGION_TBL(ARM_REALM_BASE, \
+							   ARM_REALM_SIZE, \
+							   GPI_REALM)
+
+#define ARM_PAS_EL3_DRAM		MAP_GPT_REGION_TBL(ARM_EL3_TZC_DRAM1_BASE, \
+							ARM_EL3_TZC_DRAM1_SIZE,	\
+							GPI_ROOT)
+
+#define	ARM_PAS_GPTS			MAP_GPT_REGION_TBL(ARM_L1_GPT_ADDR_BASE, \
+							   ARM_L1_GPT_SIZE,      \
+							   GPI_ROOT)
+
+#endif /* ARM_PAS_DEF_H */