bsps/aarch64: Add MMU driver to relax alignment

Currently, the AArch64 BSPs have a hard time running on real hardware
without building the toolchain and the bsps with -mstrict-align in
multiple places. Configuring the MMU on these chips allows for unaligned
memory accesses for non-device memory which avoids requiring strict
alignment in the toolchain and in the BSPs themselves.

In writing this driver, it was found that the synchronous exception
handling code needed to be rewritten since it relied on clearing SCTLR_EL1 to
avoid thread stack misalignments in RTEMS_DEBUG mode. This is now
avoided by exactly preserving thread mode stack and flags and the new
implementation is compatible with the draft information provided on the
mailing list covering the Exception Management API.

5 files changed, 518 insertions, 0 deletions

diff --git a/bsps/aarch64/include/bsp/aarch64-mmu.h b/bsps/aarch64/include/bsp/aarch64-mmu.h
new file mode 100644
index 0000000000..e82012576f
--- /dev/null
+++ b/bsps/aarch64/include/bsp/aarch64-mmu.h
@@ -0,0 +1,426 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+
+/**
+ * @file
+ *
+ * @ingroup aarch64_start
+ *
+ * @brief AArch64 MMU configuration.
+ */
+
+/*
+ * Copyright (C) 2021 On-Line Applications Research Corporation (OAR)
+ * Written by Kinsey Moore <kinsey.moore@oarcorp.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * 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 OWNER 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 LIBBSP_AARCH64_SHARED_AARCH64_MMU_H
+#define LIBBSP_AARCH64_SHARED_AARCH64_MMU_H
+
+#include <bsp/start.h>
+#include <bsp/linker-symbols.h>
+#include <rtems/score/aarch64-system-registers.h>
+#include <bspopts.h>
+#include <bsp/utility.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/* VMSAv8 Long-descriptor fields */
+#define MMU_DESC_AF                        BSP_BIT64( 10 )
+#define MMU_DESC_SH_INNER                  ( BSP_BIT64( 9 ) | BSP_BIT64( 8 ) )
+#define MMU_DESC_WRITE_DISABLE             BSP_BIT64( 7 )
+/* PAGE and TABLE flags are the same bit, but only apply on certain levels */
+#define MMU_DESC_TYPE_TABLE                BSP_BIT64( 1 )
+#define MMU_DESC_TYPE_PAGE                 BSP_BIT64( 1 )
+#define MMU_DESC_VALID                     BSP_BIT64( 0 )
+#define MMU_DESC_MAIR_ATTR( val )          BSP_FLD64( val, 2, 3 )
+#define MMU_DESC_MAIR_ATTR_GET( reg )      BSP_FLD64GET( reg, 2, 3 )
+#define MMU_DESC_MAIR_ATTR_SET( reg, val ) BSP_FLD64SET( reg, val, 2, 3 )
+#define MMU_DESC_PAGE_TABLE_MASK           0xFFFFFFFFF000LL
+
+/* Page table configuration */
+#define MMU_PAGE_BITS           12
+#define MMU_PAGE_SIZE           ( 1 << MMU_PAGE_BITS )
+#define MMU_BITS_PER_LEVEL      9
+#define MMU_TOP_LEVEL_PAGE_BITS ( 2 * MMU_BITS_PER_LEVEL + MMU_PAGE_BITS )
+
+#define AARCH64_MMU_FLAGS_BASE \
+  ( MMU_DESC_VALID | MMU_DESC_SH_INNER | MMU_DESC_AF )
+
+#define AARCH64_MMU_DATA_RO_CACHED \
+  ( AARCH64_MMU_FLAGS_BASE | MMU_DESC_MAIR_ATTR( 3 ) | MMU_DESC_WRITE_DISABLE )
+#define AARCH64_MMU_CODE_CACHED AARCH64_MMU_DATA_RO_CACHED
+#define AARCH64_MMU_CODE_RW_CACHED AARCH64_MMU_DATA_RW_CACHED
+
+#define AARCH64_MMU_DATA_RO \
+  ( AARCH64_MMU_FLAGS_BASE | MMU_DESC_MAIR_ATTR( 1 ) | MMU_DESC_WRITE_DISABLE )
+#define AARCH64_MMU_CODE AARCH64_MMU_DATA_RO
+#define AARCH64_MMU_CODE_RW AARCH64_MMU_DATA_RW
+
+/* RW implied by not ORing in RO */
+#define AARCH64_MMU_DATA_RW_CACHED \
+  ( AARCH64_MMU_FLAGS_BASE | MMU_DESC_MAIR_ATTR( 3 ) )
+#define AARCH64_MMU_DATA_RW \
+  ( AARCH64_MMU_FLAGS_BASE | MMU_DESC_MAIR_ATTR( 1 ) )
+#define AARCH64_MMU_DEVICE ( AARCH64_MMU_FLAGS_BASE | MMU_DESC_MAIR_ATTR( 0 ) )
+
+typedef struct {
+  uintptr_t begin;
+  uintptr_t end;
+  uint64_t flags;
+} aarch64_mmu_config_entry;
+
+#define AARCH64_MMU_DEFAULT_SECTIONS \
+  { \
+    .begin = (uintptr_t) bsp_section_fast_text_begin, \
+    .end = (uintptr_t) bsp_section_fast_text_end, \
+    .flags = AARCH64_MMU_CODE_CACHED \
+  }, { \
+    .begin = (uintptr_t) bsp_section_fast_data_begin, \
+    .end = (uintptr_t) bsp_section_fast_data_end, \
+    .flags = AARCH64_MMU_DATA_RW_CACHED \
+  }, { \
+    .begin = (uintptr_t) bsp_section_start_begin, \
+    .end = (uintptr_t) bsp_section_start_end, \
+    .flags = AARCH64_MMU_CODE_CACHED \
+  }, { \
+    .begin = (uintptr_t) bsp_section_vector_begin, \
+    .end = (uintptr_t) bsp_section_vector_end, \
+    .flags = AARCH64_MMU_DATA_RW_CACHED \
+  }, { \
+    .begin = (uintptr_t) bsp_section_text_begin, \
+    .end = (uintptr_t) bsp_section_text_end, \
+    .flags = AARCH64_MMU_CODE_CACHED \
+  }, { \
+    .begin = (uintptr_t) bsp_section_rodata_begin, \
+    .end = (uintptr_t) bsp_section_rodata_end, \
+    .flags = AARCH64_MMU_DATA_RO_CACHED \
+  }, { \
+    .begin = (uintptr_t) bsp_section_data_begin, \
+    .end = (uintptr_t) bsp_section_data_end, \
+    .flags = AARCH64_MMU_DATA_RW_CACHED \
+  }, { \
+    .begin = (uintptr_t) bsp_section_bss_begin, \
+    .end = (uintptr_t) bsp_section_bss_end, \
+    .flags = AARCH64_MMU_DATA_RW_CACHED \
+  }, { \
+    .begin = (uintptr_t) bsp_section_rtemsstack_begin, \
+    .end = (uintptr_t) bsp_section_rtemsstack_end, \
+    .flags = AARCH64_MMU_DATA_RW_CACHED \
+  }, { \
+    .begin = (uintptr_t) bsp_section_work_begin, \
+    .end = (uintptr_t) bsp_section_work_end, \
+    .flags = AARCH64_MMU_DATA_RW_CACHED \
+  }, { \
+    .begin = (uintptr_t) bsp_section_stack_begin, \
+    .end = (uintptr_t) bsp_section_stack_end, \
+    .flags = AARCH64_MMU_DATA_RW_CACHED \
+  }, { \
+    .begin = (uintptr_t) bsp_section_nocache_begin, \
+    .end = (uintptr_t) bsp_section_nocache_end, \
+    .flags = AARCH64_MMU_DEVICE \
+  }, { \
+    .begin = (uintptr_t) bsp_section_nocachenoload_begin, \
+    .end = (uintptr_t) bsp_section_nocachenoload_end, \
+    .flags = AARCH64_MMU_DEVICE \
+  }, { \
+    .begin = (uintptr_t) bsp_translation_table_base, \
+    .end = (uintptr_t) bsp_translation_table_end, \
+    .flags = AARCH64_MMU_DATA_RW_CACHED \
+  }, { \
+/*
+ * The vector table must be in writable and executable memory as it stores both
+ * exception code and the mutable pointer to which it jumps
+ */ \
+    .begin = (uintptr_t) bsp_start_vector_table_begin, \
+    .end = (uintptr_t) bsp_start_vector_table_end, \
+    .flags = AARCH64_MMU_CODE_RW_CACHED \
+  }
+
+/* setup straight mapped block entries */
+BSP_START_TEXT_SECTION static inline void aarch64_mmu_page_table_set_blocks(
+  uint64_t *page_table,
+  uint64_t base,
+  uint32_t bits_offset,
+  uint64_t default_attr
+)
+{
+  uint64_t page_flag = 0;
+
+  if ( bits_offset == MMU_PAGE_BITS ) {
+    page_flag = MMU_DESC_TYPE_PAGE;
+  }
+
+  for ( uint64_t i = 0; i < ( 1 << MMU_BITS_PER_LEVEL ); i++ ) {
+    page_table[i] = base | ( i << bits_offset );
+    page_table[i] |= default_attr | page_flag;
+  }
+}
+
+BSP_START_TEXT_SECTION static inline rtems_status_code
+aarch64_mmu_page_table_alloc( uint64_t **page_table )
+{
+  /* First page table is already in use as TTB0 */
+  static uintptr_t *current_page_table =
+    (uintptr_t *) bsp_translation_table_base;
+
+  current_page_table += MMU_PAGE_SIZE;
+  *page_table = (uint64_t *) current_page_table;
+
+  /* Out of linker-allocated page tables? */
+  uintptr_t consumed_pages = (uintptr_t) current_page_table;
+  consumed_pages -= (uintptr_t) bsp_translation_table_base;
+  consumed_pages /= MMU_PAGE_SIZE;
+
+  if ( consumed_pages > AARCH64_MMU_TRANSLATION_TABLE_PAGES ) {
+    *page_table = NULL;
+    return RTEMS_NO_MEMORY;
+  }
+
+  return RTEMS_SUCCESSFUL;
+}
+
+BSP_START_TEXT_SECTION static inline uintptr_t aarch64_mmu_get_index(
+  uintptr_t root_address,
+  uintptr_t vaddr,
+  uint32_t shift
+)
+{
+  uintptr_t mask = ( 1 << ( MMU_BITS_PER_LEVEL + 1 ) ) - 1;
+
+  return ( ( vaddr - root_address ) >> shift ) & mask;
+}
+
+BSP_START_TEXT_SECTION static inline rtems_status_code
+aarch64_mmu_get_sub_table(
+  uint64_t *page_table_entry,
+  uint64_t **sub_table,
+  uintptr_t physical_root_address,
+  uint32_t shift
+)
+{
+  /* check if the index already has a page table */
+  if ( ( *page_table_entry & MMU_DESC_TYPE_TABLE ) == MMU_DESC_TYPE_TABLE ) {
+    /* extract page table address */
+    uint64_t table_pointer = *page_table_entry & MMU_DESC_PAGE_TABLE_MASK;
+    /* This cast should be safe since the address was inserted in this mode */
+    *sub_table = (uint64_t *) (uintptr_t) table_pointer;
+  } else {
+    /* allocate new page table and set block */
+    rtems_status_code sc = aarch64_mmu_page_table_alloc( sub_table );
+
+    if ( sc != RTEMS_SUCCESSFUL ) {
+      return sc;
+    }
+
+    aarch64_mmu_page_table_set_blocks(
+      *sub_table,
+      physical_root_address,
+      shift - MMU_BITS_PER_LEVEL,
+      *page_table_entry & ~MMU_DESC_PAGE_TABLE_MASK
+    );
+    *page_table_entry = (uintptr_t) *sub_table;
+    *page_table_entry |= MMU_DESC_TYPE_TABLE | MMU_DESC_VALID;
+  }
+
+  return RTEMS_SUCCESSFUL;
+}
+
+BSP_START_TEXT_SECTION static inline rtems_status_code aarch64_mmu_map_block(
+  uint64_t *page_table,
+  uintptr_t root_address,
+  uintptr_t addr,
+  uint64_t size,
+  uint32_t level,
+  uint64_t flags
+)
+{
+  uint32_t shift = ( 2 - level ) * MMU_BITS_PER_LEVEL + MMU_PAGE_BITS;
+  uintptr_t granularity = 1 << shift;
+  uint64_t page_flag = 0;
+
+  if ( level == 2 ) {
+    page_flag = MMU_DESC_TYPE_PAGE;
+  }
+
+  while ( size > 0 ) {
+    uintptr_t index = aarch64_mmu_get_index( root_address, addr, shift );
+    uintptr_t block_bottom = RTEMS_ALIGN_DOWN( addr, granularity );
+    uint64_t chunk_size = granularity;
+
+    /* check for perfect block match */
+    if ( block_bottom == addr ) {
+      if ( size >= chunk_size ) {
+        /* when page_flag is set the last level must be a page descriptor */
+        if ( page_flag || ( page_table[index] & MMU_DESC_TYPE_TABLE ) != MMU_DESC_TYPE_TABLE ) {
+          /* no sub-table, apply block properties */
+          page_table[index] = addr | flags | page_flag;
+          size -= chunk_size;
+          addr += chunk_size;
+          continue;
+        }
+      } else {
+        /* block starts on a boundary, but is short */
+        chunk_size = size;
+      }
+    } else {
+      uintptr_t block_top = RTEMS_ALIGN_UP( addr, granularity );
+      chunk_size = block_top - addr;
+
+      if ( chunk_size > size ) {
+        chunk_size = size;
+      }
+    }
+
+    /* Deal with any subtable modification  */
+    uintptr_t new_root_address = root_address + index * granularity;
+    uint64_t *sub_table = NULL;
+    rtems_status_code sc;
+
+    sc = aarch64_mmu_get_sub_table(
+      &page_table[index],
+      &sub_table,
+      new_root_address,
+      shift
+    );
+
+    if ( sc != RTEMS_SUCCESSFUL ) {
+      return sc;
+    }
+
+    sc = aarch64_mmu_map_block(
+      sub_table,
+      new_root_address,
+      addr,
+      chunk_size,
+      level + 1,
+      flags
+    );
+
+    if ( sc != RTEMS_SUCCESSFUL ) {
+      return sc;
+    }
+
+    size -= chunk_size;
+    addr += chunk_size;
+  }
+
+  return RTEMS_SUCCESSFUL;
+}
+
+BSP_START_DATA_SECTION extern const aarch64_mmu_config_entry
+  aarch64_mmu_config_table[];
+
+BSP_START_DATA_SECTION extern const size_t
+  aarch64_mmu_config_table_size;
+
+BSP_START_TEXT_SECTION static inline void
+aarch64_mmu_set_translation_table_entries(
+  uint64_t *ttb,
+  const aarch64_mmu_config_entry *config
+)
+{
+  /* Force alignemnt to 4k page size */
+  uintptr_t begin = RTEMS_ALIGN_DOWN( config->begin, MMU_PAGE_SIZE );
+  uintptr_t end = RTEMS_ALIGN_UP( config->end, MMU_PAGE_SIZE );
+  rtems_status_code sc;
+
+  sc = aarch64_mmu_map_block(
+    ttb,
+    0x0,
+    begin,
+    end - begin,
+    0,
+    config->flags
+  );
+
+  if ( sc != RTEMS_SUCCESSFUL ) {
+    rtems_fatal_error_occurred( sc );
+  }
+}
+
+BSP_START_TEXT_SECTION static inline void aarch64_mmu_setup_translation_table(
+  const aarch64_mmu_config_entry *config_table,
+  size_t config_count
+)
+{
+  size_t i;
+  uint64_t *ttb = (uint64_t *) bsp_translation_table_base;
+
+  aarch64_mmu_page_table_set_blocks(
+    ttb,
+    (uintptr_t) NULL,
+    MMU_TOP_LEVEL_PAGE_BITS,
+    0
+  );
+
+  _AArch64_Write_ttbr0_el1( (uintptr_t) ttb );
+
+  /* Configure entries required for each memory section */
+  for ( i = 0; i < config_count; ++i ) {
+    aarch64_mmu_set_translation_table_entries( ttb, &config_table[i] );
+  }
+}
+
+BSP_START_TEXT_SECTION static inline void
+aarch64_mmu_setup_translation_table_and_enable(
+  const aarch64_mmu_config_entry *config_table,
+  size_t config_count
+)
+{
+  uint64_t sctlr;
+
+  aarch64_mmu_setup_translation_table(
+    config_table,
+    config_count
+  );
+
+  /* Enable MMU and cache */
+  sctlr = _AArch64_Read_sctlr_el1();
+  sctlr |= AARCH64_SCTLR_EL1_I | AARCH64_SCTLR_EL1_C | AARCH64_SCTLR_EL1_M;
+  _AArch64_Write_sctlr_el1( sctlr );
+}
+
+BSP_START_TEXT_SECTION static inline void aarch64_mmu_setup( void )
+{
+  /* Set TCR */
+  /* 128GB/36 bits mappable (64-0x1c) */
+  _AArch64_Write_tcr_el1(
+    AARCH64_TCR_EL1_T0SZ( 0x1c ) | AARCH64_TCR_EL1_IRGN0( 0x1 ) |
+    AARCH64_TCR_EL1_ORGN0( 0x1 ) | AARCH64_TCR_EL1_SH0( 0x3 ) | AARCH64_TCR_EL1_TG0( 0x0 )
+  );
+
+  /* Set MAIR */
+  _AArch64_Write_mair_el1(
+    AARCH64_MAIR_EL1_ATTR0( 0x0 ) | AARCH64_MAIR_EL1_ATTR1( 0x4 ) |
+    AARCH64_MAIR_EL1_ATTR2( 0x44 ) | AARCH64_MAIR_EL1_ATTR3( 0xFF )
+  );
+}
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* LIBBSP_AARCH64_SHARED_AARCH64_MMU_H */
diff --git a/bsps/aarch64/include/bsp/linker-symbols.h b/bsps/aarch64/include/bsp/linker-symbols.h
index c9a2bfd233..38c655ba97 100644
--- a/bsps/aarch64/include/bsp/linker-symbols.h
+++ b/bsps/aarch64/include/bsp/linker-symbols.h
@@ -104,6 +104,10 @@ LINKER_SYMBOL(bsp_section_bss_begin)
 LINKER_SYMBOL(bsp_section_bss_end)
 LINKER_SYMBOL(bsp_section_bss_size)
 
+LINKER_SYMBOL(bsp_section_rtemsstack_begin)
+LINKER_SYMBOL(bsp_section_rtemsstack_end)
+LINKER_SYMBOL(bsp_section_rtemsstack_size)
+
 LINKER_SYMBOL(bsp_section_work_begin)
 LINKER_SYMBOL(bsp_section_work_end)
 LINKER_SYMBOL(bsp_section_work_size)
@@ -134,6 +138,9 @@ LINKER_SYMBOL(bsp_start_vector_table_begin)
 LINKER_SYMBOL(bsp_start_vector_table_end)
 LINKER_SYMBOL(bsp_start_vector_table_size)
 
+LINKER_SYMBOL(bsp_translation_table_base)
+LINKER_SYMBOL(bsp_translation_table_end)
+
 #define BSP_FAST_TEXT_SECTION \
   RTEMS_SECTION(".bsp_fast_text")
 
diff --git a/bsps/aarch64/xilinx-zynqmp/include/bsp.h b/bsps/aarch64/xilinx-zynqmp/include/bsp.h
index e405cc2ed7..83f2e2f4e4 100644
--- a/bsps/aarch64/xilinx-zynqmp/include/bsp.h
+++ b/bsps/aarch64/xilinx-zynqmp/include/bsp.h
@@ -61,6 +61,13 @@ extern "C" {
 
 #define BSP_RESET_SMC
 
+/**
+ * @brief Zynq UltraScale+ MPSoC specific set up of the MMU.
+ *
+ * Provide in the application to override the defaults in the BSP.
+ */
+BSP_START_TEXT_SECTION void zynqmp_setup_mmu_and_cache(void);
+
 void zynqmp_debug_console_flush(void);
 
 #ifdef __cplusplus
diff --git a/bsps/aarch64/xilinx-zynqmp/start/bspstarthooks.c b/bsps/aarch64/xilinx-zynqmp/start/bspstarthooks.c
index b165b42909..7bd787592c 100644
--- a/bsps/aarch64/xilinx-zynqmp/start/bspstarthooks.c
+++ b/bsps/aarch64/xilinx-zynqmp/start/bspstarthooks.c
@@ -47,5 +47,6 @@ BSP_START_TEXT_SECTION void bsp_start_hook_1(void)
 {
   AArch64_start_set_vector_base();
   bsp_start_copy_sections();
+  zynqmp_setup_mmu_and_cache();
   bsp_start_clear_bss();
 }
diff --git a/bsps/aarch64/xilinx-zynqmp/start/bspstartmmu.c b/bsps/aarch64/xilinx-zynqmp/start/bspstartmmu.c
new file mode 100644
index 0000000000..8d302e97b5
--- /dev/null
+++ b/bsps/aarch64/xilinx-zynqmp/start/bspstartmmu.c
@@ -0,0 +1,77 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+
+/**
+ * @file
+ *
+ * @ingroup RTEMSBSPsAArch64XilinxZynqMP
+ *
+ * @brief This source file contains the default MMU tables and setup.
+ */
+
+/*
+ * Copyright (C) 2021 On-Line Applications Research Corporation (OAR)
+ * Written by Kinsey Moore <kinsey.moore@oarcorp.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * 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 OWNER 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.
+ */
+
+#include <bsp.h>
+#include <bsp/start.h>
+#include <bsp/aarch64-mmu.h>
+
+BSP_START_DATA_SECTION static const aarch64_mmu_config_entry
+zynqmp_mmu_config_table[] = {
+  AARCH64_MMU_DEFAULT_SECTIONS,
+#if defined( RTEMS_SMP )
+  {
+    .begin = 0xffff0000U,
+    .end = 0xffffffffU,
+    .flags = AARCH64_MMU_DEVICE
+  },
+#endif
+  {
+    .begin = 0xf9000000U,
+    .end = 0xf9100000U,
+    .flags = AARCH64_MMU_DEVICE
+  }, {
+    .begin = 0xfd000000U,
+    .end = 0xffc00000U,
+    .flags = AARCH64_MMU_DEVICE
+  }
+};
+
+/*
+ * Make weak and let the user override.
+ */
+BSP_START_TEXT_SECTION void
+zynqmp_setup_mmu_and_cache( void ) __attribute__ ((weak));
+
+BSP_START_TEXT_SECTION void
+zynqmp_setup_mmu_and_cache( void )
+{
+  aarch64_mmu_setup();
+
+  aarch64_mmu_setup_translation_table_and_enable(
+    &zynqmp_mmu_config_table[ 0 ],
+    RTEMS_ARRAY_SIZE( zynqmp_mmu_config_table )
+  );
+}