[PATCH 4/6] libmm-libbsp-arm-shared. libmm low-level implementation that can be shared between many ARM targets. mminit.c contains initialization function for arm-cp15 and setup page tables. After that it enables MMU and Cache unit part of BSP initialization process. mm.c translates attributes from high-level to CPU specific attributes and apply them dynamically.

[Hesham AL-Matary]

---
 .../lib/libbsp/arm/shared/include/arm-cp15-start.h | 11 ++++--
 c/src/lib/libbsp/arm/shared/mm.c                   | 46 ++++++++++++++++++++++
 c/src/lib/libbsp/arm/shared/mminit.c               | 27 +++++++++++++
 3 files changed, 80 insertions(+), 4 deletions(-)
 create mode 100644 c/src/lib/libbsp/arm/shared/mm.c
 create mode 100644 c/src/lib/libbsp/arm/shared/mminit.c

diff --git a/c/src/lib/libbsp/arm/shared/include/arm-cp15-start.h 
b/c/src/lib/libbsp/arm/shared/include/arm-cp15-start.h
index 01f3104..b463b1f 100644
--- a/c/src/lib/libbsp/arm/shared/include/arm-cp15-start.h
+++ b/c/src/lib/libbsp/arm/shared/include/arm-cp15-start.h
@@ -1,4 +1,5 @@
-/*
+/* 
+ * Copyright (c) 2013 Hesham AL-Matary.
  * Copyright (c) 2009-2013 embedded brains GmbH.  All rights reserved.
  *
  *  embedded brains GmbH
@@ -89,7 +90,7 @@ 
arm_cp15_start_setup_translation_table_and_enable_mmu_and_cache(
 
   /* Initialize translation table with invalid entries */
   for (i = 0; i < ARM_MMU_TRANSLATION_TABLE_ENTRY_COUNT; ++i) {
-    ttb [i] = 0;
+    ttb [i] = (i << ARM_MMU_SECT_BASE_SHIFT) | ARMV7_MMU_DATA_READ_WRITE;
   }
 
   for (i = 0; i < config_count; ++i) {
@@ -97,11 +98,13 @@ 
arm_cp15_start_setup_translation_table_and_enable_mmu_and_cache(
   }
 
   /* Enable MMU and cache */
-  ctrl |= ARM_CP15_CTRL_I | ARM_CP15_CTRL_C | ARM_CP15_CTRL_M;
+  ctrl |= ARM_CP15_CTRL_AFE | ARM_CP15_CTRL_S | ARM_CP15_CTRL_I |
+          ARM_CP15_CTRL_C | ARM_CP15_CTRL_M  | ARM_CP15_CTRL_XP;
+
   arm_cp15_set_control(ctrl);
 }
 
-BSP_START_TEXT_SECTION static inline uint32_t
+BSP_START_TEXT_SECTION inline uint32_t
 arm_cp15_start_setup_mmu_and_cache(uint32_t ctrl_clear, uint32_t ctrl_set)
 {
   uint32_t ctrl = arm_cp15_get_control();
diff --git a/c/src/lib/libbsp/arm/shared/mm.c b/c/src/lib/libbsp/arm/shared/mm.c
new file mode 100644
index 0000000..36e90be
--- /dev/null
+++ b/c/src/lib/libbsp/arm/shared/mm.c
@@ -0,0 +1,46 @@
+/* 
+ * Copyright (c) 2013 Hesham AL-Matary.
+ *
+ * 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/mm.h>
+#include <libcpu/arm-cp15.h>
+#include <rtems/score/mm.h>
+
+#define LIBMM_REGION_IS_CACHE_ENABLED(attr) \
+  (((attr) >> RTEMS_MM_REGION_BIT_CACHE) & 1U)
+#define LIBMM_REGION_IS_PROTECTION_WRITE_ENABLED(attr) \
+  (((attr) >> RTEMS_MM_REGION_BIT_WRITE) & 1U)
+#define LIBMM_REGION_IS_DEVICE_TYPE(attr) \
+  (((attr) >> RTEMS_MM_REGION_BIT_DEVICE) & 1U)
+#define LIBMM_REGION_IS_SHARED_MEMORY(attr) \
+  (((attr) >> RTEMS_MM_REGION_BIT_SHARED) & 1U)
+
+#define ARM_MMU_BIND_SECTION_TO_CLIENT_DOMAIN \
+  (ARM_MMU_DEFAULT_CLIENT_DOMAIN << ARM_MMU_SECT_DOMAIN_SHIFT)
+
+#define LIBMM_TRANSLATE_ATTRIBUTES_TO_CPU(attr) \
+  ((ARM_MMU_BIND_SECTION_TO_CLIENT_DOMAIN) \
+  | (ARM_MMU_SECT_AP_0) \
+  | (LIBMM_REGION_IS_PROTECTION_WRITE_ENABLED(attr) ? \
+  0U : (ARM_MMU_SECT_AP_2)) \
+  | (LIBMM_REGION_IS_CACHE_ENABLED(attr) ? \
+  (ARM_MMU_SECT_TEX_0|ARM_MMU_SECT_C|ARM_MMU_SECT_B) : 0U) \
+  | (LIBMM_REGION_IS_DEVICE_TYPE(attr) ? ARM_MMU_SECT_B : 0U) \
+  | (LIBMM_REGION_IS_SHARED_MEMORY(attr) ? ARM_MMU_SECT_S : 0U) \
+  | (ARM_MMU_SECT_DEFAULT))
+
+void bsp_memory_management_set_attributes(
+  uintptr_t base,
+  size_t size,
+  uint32_t attr
+)
+{
+  uintptr_t end = (uint32_t)base + (uint32_t)size;
+  uint32_t section_flags = LIBMM_TRANSLATE_ATTRIBUTES_TO_CPU(attr);
+
+  arm_cp15_set_translation_table_entries(base, end, section_flags);
+}
diff --git a/c/src/lib/libbsp/arm/shared/mminit.c 
b/c/src/lib/libbsp/arm/shared/mminit.c
new file mode 100644
index 0000000..333d65c
--- /dev/null
+++ b/c/src/lib/libbsp/arm/shared/mminit.c
@@ -0,0 +1,27 @@
+/* 
+ * Copyright (c) 2013 Hesham AL-Matary.
+ * 
+ * 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/arm-cp15-start.h>
+#include <bsp/linker-symbols.h>
+#include <bsp/mm.h>
+#include <bsp/start.h>
+
+extern const mm_init_start_config bsp_mm_config_table[];
+extern const size_t bsp_mm_config_table_size;
+
+BSP_START_TEXT_SECTION void bsp_memory_management_initialize(void)
+{
+  uint32_t ctrl = arm_cp15_get_control();
+
+  arm_cp15_start_setup_translation_table_and_enable_mmu_and_cache(
+  ctrl,
+  (uint32_t *) bsp_translation_table_base,
+  ARM_MMU_DEFAULT_CLIENT_DOMAIN,
+  &bsp_mm_config_table[0],
+  bsp_mm_config_table_size
+  );
+}
-- 
1.8.3.1

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