Index: kernel/genarch/src/ddi/ddi-bitmap.c
===================================================================
--- kernel/genarch/src/ddi/ddi-bitmap.c	(revision 6eeb4a3e81a72dcdffeb1256ea248c75983514ab)
+++ kernel/genarch/src/ddi/ddi-bitmap.c	(revision 6eeb4a3e81a72dcdffeb1256ea248c75983514ab)
@@ -0,0 +1,148 @@
+/*
+ * Copyright (c) 2006 Jakub Jermar
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - 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.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ */
+
+/** @addtogroup amd64ddi
+ * @{
+ */
+/** @file
+ */
+
+#include <ddi/ddi.h>
+#include <arch/ddi/ddi.h>
+#include <proc/task.h>
+#include <typedefs.h>
+#include <adt/bitmap.h>
+#include <mm/slab.h>
+#include <arch/pm.h>
+#include <errno.h>
+#include <arch/cpu.h>
+#include <cpu.h>
+#include <arch.h>
+#include <align.h>
+
+/** Enable I/O space range for task.
+ *
+ * Interrupts are disabled and task is locked.
+ *
+ * @param task   Task.
+ * @param ioaddr Starting I/O space address.
+ * @param size   Size of the enabled I/O range.
+ *
+ * @return EOK on success or an error code from errno.h.
+ *
+ */
+int ddi_iospace_enable_arch(task_t *task, uintptr_t ioaddr, size_t size)
+{
+	size_t elements = ioaddr + size;
+	if (elements > IO_PORTS)
+		return ENOENT;
+	
+	if (task->arch.iomap.elements < elements) {
+		/*
+		 * The I/O permission bitmap is too small and needs to be grown.
+		 */
+		
+		void *store = malloc(bitmap_size(elements), FRAME_ATOMIC);
+		if (!store)
+			return ENOMEM;
+		
+		bitmap_t oldiomap;
+		bitmap_initialize(&oldiomap, task->arch.iomap.elements,
+		    task->arch.iomap.bits);
+		
+		bitmap_initialize(&task->arch.iomap, elements, store);
+		
+		/*
+		 * Mark the new range inaccessible.
+		 */
+		bitmap_set_range(&task->arch.iomap, oldiomap.elements,
+		    elements - oldiomap.elements);
+		
+		/*
+		 * In case there really existed smaller iomap,
+		 * copy its contents and deallocate it.
+		 */
+		if (oldiomap.bits) {
+			bitmap_copy(&task->arch.iomap, &oldiomap,
+			    oldiomap.elements);
+			
+			free(oldiomap.bits);
+		}
+	}
+	
+	/*
+	 * Enable the range and we are done.
+	 */
+	bitmap_clear_range(&task->arch.iomap, (size_t) ioaddr, size);
+	
+	/*
+	 * Increment I/O Permission bitmap generation counter.
+	 */
+	task->arch.iomapver++;
+	
+	return EOK;
+}
+
+/** Disable I/O space range for task.
+ *
+ * Interrupts are disabled and task is locked.
+ *
+ * @param task   Task.
+ * @param ioaddr Starting I/O space address.
+ * @param size   Size of the enabled I/O range.
+ *
+ * @return EOK on success or an error code from errno.h.
+ *
+ */
+int ddi_iospace_disable_arch(task_t *task, uintptr_t ioaddr, size_t size)
+{
+	size_t elements = ioaddr + size;
+	if (elements > IO_PORTS)
+		return ENOENT;
+	
+	if (ioaddr >= task->arch.iomap.elements)
+		return EINVAL;	
+
+	if (task->arch.iomap.elements < elements)
+		size -= elements - task->arch.iomap.elements;
+
+	/*
+	 * Disable the range.
+	 */
+	bitmap_set_range(&task->arch.iomap, (size_t) ioaddr, size);
+	
+	/*
+	 * Increment I/O Permission bitmap generation counter.
+	 */
+	task->arch.iomapver++;
+	
+	return 0;
+}
+
+/** @}
+ */
Index: kernel/genarch/src/ddi/ddi-dummy.c
===================================================================
--- kernel/genarch/src/ddi/ddi-dummy.c	(revision 6eeb4a3e81a72dcdffeb1256ea248c75983514ab)
+++ kernel/genarch/src/ddi/ddi-dummy.c	(revision 6eeb4a3e81a72dcdffeb1256ea248c75983514ab)
@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2006 Jakub Jermar
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - 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.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ */
+
+/** @addtogroup genarch 
+ * @{
+ */
+/** @file
+ *  @brief DDI.
+ */
+
+#include <ddi/ddi.h>
+#include <proc/task.h>
+#include <typedefs.h>
+
+/** Enable I/O space range for task.
+ *
+ * Interrupts are disabled and task is locked.
+ *
+ * @param task   Task.
+ * @param ioaddr Starting I/O space address.
+ * @param size   Size of the enabled I/O range.
+ *
+ * @return EOK on success or an error code from errno.h.
+ */
+int ddi_iospace_enable_arch(task_t *task, uintptr_t ioaddr, size_t size)
+{
+	return 0;
+}
+
+/** Disable I/O space range for task.
+ *
+ * Interrupts are disabled and task is locked.
+ *
+ * @param task   Task.
+ * @param ioaddr Starting I/O space address.
+ * @param size   Size of the disabled I/O range.
+ *
+ * @return EOK on success or an error code from errno.h.
+ */
+int ddi_iospace_disable_arch(task_t *task, uintptr_t ioaddr, size_t size)
+{
+	return 0;
+}
+
+/** @}
+ */