arch/arm_addrenv_pgmap.c: Add minimal page map implementation for ARM

arch/arm/src/armv7-a/CMakeLists.txt

@@ -74,8 +74,14 @@ else()
 endif()
 
 if(CONFIG_ARCH_ADDRENV)
-  list(APPEND SRCS arm_addrenv.c arm_addrenv_utils.c arm_addrenv_perms.c
-       arm_pgalloc.c)
+  list(
+    APPEND
+    SRCS
+    arm_addrenv.c
+    arm_addrenv_utils.c
+    arm_addrenv_perms.c
+    arm_pgalloc.c
+    arm_addrenv_pgmap.c)
   if(CONFIG_ARCH_STACK_DYNAMIC)
     list(APPEND SRCS arm_addrenv_ustack.c)
   endif()

arch/arm/src/armv7-a/Make.defs

@@ -65,6 +65,7 @@ endif
 
 ifeq ($(CONFIG_ARCH_ADDRENV),y)
   CMN_CSRCS += arm_addrenv.c arm_addrenv_utils.c arm_addrenv_perms.c arm_pgalloc.c
+  CMN_CSRCS += arm_addrenv_pgmap.c
   ifeq ($(CONFIG_ARCH_STACK_DYNAMIC),y)
     CMN_CSRCS += arm_addrenv_ustack.c
   endif

arch/arm/src/armv7-a/arm_addrenv_pgmap.c

@@ -0,0 +1,75 @@
+/****************************************************************************
+ * arch/arm/src/armv7-a/arm_addrenv_pgmap.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <nuttx/arch.h>
+#include <nuttx/compiler.h>
+#include <nuttx/pgalloc.h>
+
+#include "pgalloc.h"
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: up_addrenv_page_vaddr
+ *
+ * Description:
+ *   Find the kernel virtual address associated with physical page.
+ *
+ * Input Parameters:
+ *   page - The page physical address.
+ *
+ * Returned Value:
+ *   Page kernel virtual address on success; NULL on failure.
+ *
+ ****************************************************************************/
+
+uintptr_t up_addrenv_page_vaddr(uintptr_t page)
+{
+  return arm_pgvaddr(page);
+}
+
+/****************************************************************************
+ * Name: up_addrenv_page_wipe
+ *
+ * Description:
+ *   Wipe a page of physical memory, first mapping it into kernel virtual
+ *   memory.
+ *
+ * Input Parameters:
+ *   page - The page physical address.
+ *
+ * Returned Value:
+ *   None.
+ *
+ ****************************************************************************/
+
+void up_addrenv_page_wipe(uintptr_t page)
+{
+  uintptr_t vaddr = arm_pgvaddr(page);
+  memset((void *)vaddr, 0, MM_PGSIZE);
+}