arm/zynq: Add support for application supplied MMU tables.

Users can provide a zynq_setup_mmu_and_cache function that sets
up the MMU. The Zynq's PL logic means users can vary the MMU.

1 files changed, 53 insertions, 0 deletions

diff --git a/c/src/lib/libbsp/arm/xilinx-zynq/startup/bspstartmmu.c b/c/src/lib/libbsp/arm/xilinx-zynq/startup/bspstartmmu.c
new file mode 100644
index 0000000000..638d2e82b4
--- /dev/null
+++ b/c/src/lib/libbsp/arm/xilinx-zynq/startup/bspstartmmu.c
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2013 embedded brains GmbH.  All rights reserved.
+ *
+ *  embedded brains GmbH
+ *  Dornierstr. 4
+ *  82178 Puchheim
+ *  Germany
+ *  <info@embedded-brains.de>
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.com/license/LICENSE.
+ */
+
+#include <bsp.h>
+#include <bsp/start.h>
+#include <bsp/arm-cp15-start.h>
+#include <bsp/arm-a9mpcore-start.h>
+
+BSP_START_DATA_SECTION static const arm_cp15_start_section_config
+zynq_mmu_config_table[] = {
+  ARMV7_CP15_START_DEFAULT_SECTIONS,
+  {
+    .begin = 0xe0000000U,
+    .end = 0xe0200000U,
+    .flags = ARMV7_MMU_DEVICE
+  }, {
+    .begin = 0xf8000000U,
+    .end = 0xf9000000U,
+    .flags = ARMV7_MMU_DEVICE
+  }
+};
+
+/*
+ * Make weak and let the user override.
+ */
+BSP_START_TEXT_SECTION void zynq_setup_mmu_and_cache(void) __attribute__ ((weak));
+
+BSP_START_TEXT_SECTION void zynq_setup_mmu_and_cache(void)
+{
+  uint32_t ctrl = arm_cp15_start_setup_mmu_and_cache(
+    ARM_CP15_CTRL_A,
+    ARM_CP15_CTRL_AFE | ARM_CP15_CTRL_Z
+  );
+
+  arm_cp15_start_setup_translation_table_and_enable_mmu_and_cache(
+    ctrl,
+    (uint32_t *) bsp_translation_table_base,
+    ARM_MMU_DEFAULT_CLIENT_DOMAIN,
+    &zynq_mmu_config_table[0],
+    RTEMS_ARRAY_SIZE(zynq_mmu_config_table)
+  );
+}