diff --git a/lib/xlat_tables_v2/aarch32/xlat_tables_arch.h b/lib/xlat_tables_v2/aarch32/xlat_tables_arch.h
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+/*
+ * Copyright (c) 2017, 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 __XLAT_TABLES_ARCH_H__
+#define __XLAT_TABLES_ARCH_H__
+
+#include <arch.h>
+#include <platform_def.h>
+#include <xlat_tables_defs.h>
+
+/*
+ * In AArch32 state, the MMU only supports 4KB page granularity, which means
+ * that the first translation table level is either 1 or 2. Both of them are
+ * allowed to have block and table descriptors. See section G4.5.6 of the
+ * ARMv8-A Architecture Reference Manual (DDI 0487A.k) for more information.
+ *
+ * The define below specifies the first table level that allows block
+ * descriptors.
+ */
+
+#define MIN_LVL_BLOCK_DESC 1
+
+/*
+ * Each platform can define the size of the virtual address space, which is
+ * defined in PLAT_VIRT_ADDR_SPACE_SIZE. TTBCR.TxSZ is calculated as 32 minus
+ * the width of said address space. The value of TTBCR.TxSZ must be in the
+ * range 0 to 7 [1], which means that the virtual address space width must be
+ * in the range 32 to 25 bits.
+ *
+ * Here we calculate the initial lookup level from the value of
+ * PLAT_VIRT_ADDR_SPACE_SIZE. For a 4 KB page size, level 1 supports virtual
+ * address spaces of widths 32 to 31 bits, and level 2 from 30 to 25. Wider or
+ * narrower address spaces are not supported. As a result, level 3 cannot be
+ * used as initial lookup level with 4 KB granularity [1].
+ *
+ * For example, for a 31-bit address space (i.e. PLAT_VIRT_ADDR_SPACE_SIZE ==
+ * 1 << 31), TTBCR.TxSZ will be programmed to (32 - 31) = 1. According to Table
+ * G4-5 in the ARM ARM, the initial lookup level for an address space like that
+ * is 1.
+ *
+ * See the ARMv8-A Architecture Reference Manual (DDI 0487A.j) for more
+ * information:
+ * [1] Section G4.6.5
+ */
+
+#if PLAT_VIRT_ADDR_SPACE_SIZE > (1ULL << (32 - TTBCR_TxSZ_MIN))
+
+# error "PLAT_VIRT_ADDR_SPACE_SIZE is too big."
+
+#elif PLAT_VIRT_ADDR_SPACE_SIZE > (1 << L1_XLAT_ADDRESS_SHIFT)
+
+# define XLAT_TABLE_LEVEL_BASE	1
+# define NUM_BASE_LEVEL_ENTRIES	\
+		(PLAT_VIRT_ADDR_SPACE_SIZE >> L1_XLAT_ADDRESS_SHIFT)
+
+#elif PLAT_VIRT_ADDR_SPACE_SIZE >= (1 << (32 - TTBCR_TxSZ_MAX))
+
+# define XLAT_TABLE_LEVEL_BASE	2
+# define NUM_BASE_LEVEL_ENTRIES	\
+		(PLAT_VIRT_ADDR_SPACE_SIZE >> L2_XLAT_ADDRESS_SHIFT)
+
+#else
+
+# error "PLAT_VIRT_ADDR_SPACE_SIZE is too small."
+
+#endif
+
+#endif /* __XLAT_TABLES_ARCH_H__ */