bsps/arm: Add arm_cp15_set_trans*_table_entries()

1 files changed, 62 insertions, 0 deletions

diff --git a/c/src/lib/libbsp/arm/shared/arm-cp15-set-ttb-entries.c b/c/src/lib/libbsp/arm/shared/arm-cp15-set-ttb-entries.c
new file mode 100644
index 0000000000..fc311a13e3
--- /dev/null
+++ b/c/src/lib/libbsp/arm/shared/arm-cp15-set-ttb-entries.c
@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2010-2013 embedded brains GmbH.  All rights reserved.
+ *
+ *  embedded brains GmbH
+ *  Obere Lagerstr. 30
+ *  82178 Puchheim
+ *  Germany
+ *  <rtems@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 <libcpu/arm-cp15.h>
+
+static uint32_t set_translation_table_entries(
+  const void *begin,
+  const void *end,
+  uint32_t section_flags
+)
+{
+  uint32_t cl_size = arm_cp15_get_min_cache_line_size();
+  uint32_t *ttb = arm_cp15_get_translation_table_base();
+  uint32_t i = ARM_MMU_SECT_GET_INDEX(begin);
+  uint32_t iend = ARM_MMU_SECT_GET_INDEX(ARM_MMU_SECT_MVA_ALIGN_UP(end));
+  uint32_t ctrl;
+  uint32_t section_flags_of_first_entry;
+
+  ctrl = arm_cp15_mmu_disable(cl_size);
+  arm_cp15_tlb_invalidate();
+  section_flags_of_first_entry = ttb [i];
+
+  while (i < iend) {
+    uint32_t addr = i << ARM_MMU_SECT_BASE_SHIFT;
+
+    ttb [i] = addr | section_flags;
+
+    ++i;
+  }
+
+  arm_cp15_set_control(ctrl);
+
+  return section_flags_of_first_entry;
+}
+
+uint32_t arm_cp15_set_translation_table_entries(
+  const void *begin,
+  const void *end,
+  uint32_t section_flags
+)
+{
+  rtems_interrupt_level level;
+  uint32_t section_flags_of_first_entry;
+
+  rtems_interrupt_disable(level);
+  section_flags_of_first_entry =
+    set_translation_table_entries(begin, end, section_flags);
+  rtems_interrupt_enable(level);
+
+  return section_flags_of_first_entry;
+}