diff --git a/src/add-ons/kernel/busses/scsi/ahci/util.c b/src/add-ons/kernel/busses/scsi/ahci/util.c
new file mode 100644
index 0000000000..0ce2b8a2b4
--- /dev/null
+++ b/src/add-ons/kernel/busses/scsi/ahci/util.c
@@ -0,0 +1,90 @@
+/* Realtek RTL8169 Family Driver
+ * Copyright (C) 2004 Marcus Overhagen <marcus@overhagen.de>. All rights reserved.
+ *
+ * Permission to use, copy, modify and distribute this software and its 
+ * documentation for any purpose and without fee is hereby granted, provided
+ * that the above copyright notice appear in all copies, and that both the
+ * copyright notice and this permission notice appear in supporting documentation.
+ *
+ * Marcus Overhagen makes no representations about the suitability of this software
+ * for any purpose. It is provided "as is" without express or implied warranty.
+ *
+ * MARCUS OVERHAGEN DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
+ * ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL MARCUS
+ * OVERHAGEN BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
+ * DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+#include <Errors.h>
+#include <OS.h>
+#include <string.h>
+
+//#define DEBUG
+
+#include "debug.h"
+#include "util.h"
+
+static inline uint32
+round_to_pagesize(uint32 size)
+{
+	return (size + B_PAGE_SIZE - 1) & ~(B_PAGE_SIZE - 1);
+}
+
+area_id
+alloc_mem(void **virt, void **phy, size_t size, uint32 protection, const char *name)
+{
+	physical_entry pe;
+	void * virtadr;
+	area_id areaid;
+	status_t rv;
+	
+	TRACE("allocating %ld bytes for %s\n", size, name);
+
+	size = round_to_pagesize(size);
+	areaid = create_area(name, &virtadr, B_ANY_KERNEL_ADDRESS, size, B_FULL_LOCK | B_CONTIGUOUS, protection);
+	if (areaid < B_OK) {
+		ERROR("couldn't allocate area %s\n", name);
+		return B_ERROR;
+	}
+	rv = get_memory_map(virtadr, size, &pe, 1);
+	if (rv < B_OK) {
+		delete_area(areaid);
+		ERROR("couldn't get mapping for %s\n", name);
+		return B_ERROR;
+	}
+	memset(virtadr, 0, size);
+	if (virt)
+		*virt = virtadr;
+	if (phy)
+		*phy = pe.address;
+	TRACE("area = %ld, size = %ld, virt = %p, phy = %p\n", areaid, size, virtadr, pe.address);
+	return areaid;
+}
+
+area_id
+map_mem(void **virt, void *phy, size_t size, uint32 protection, const char *name)
+{
+	uint32 offset;
+	void *phyadr;
+	void *mapadr;
+	area_id area;
+
+	TRACE("mapping physical address %p with %ld bytes for %s\n", phy, size, name);
+
+	offset = (uint32)phy & (B_PAGE_SIZE - 1);
+	phyadr = (char *)phy - offset;
+	size = round_to_pagesize(size + offset);
+	area = map_physical_memory(name, phyadr, size, B_ANY_KERNEL_BLOCK_ADDRESS, protection, &mapadr);
+	if (area < B_OK) {
+		ERROR("mapping '%s' failed, error 0x%lx (%s)\n", name, area, strerror(area));
+		return area;
+	}
+	
+	*virt = (char *)mapadr + offset;
+
+	TRACE("physical = %p, virtual = %p, offset = %ld, phyadr = %p, mapadr = %p, size = %ld, area = 0x%08lx\n",
+		phy, *virt, offset, phyadr, mapadr, size, area);
+	
+	return area;
+}
diff --git a/src/add-ons/kernel/busses/scsi/ahci/util.h b/src/add-ons/kernel/busses/scsi/ahci/util.h
new file mode 100644
index 0000000000..da5b892a7c
--- /dev/null
+++ b/src/add-ons/kernel/busses/scsi/ahci/util.h
@@ -0,0 +1,27 @@
+/* Realtek RTL8169 Family Driver
+ * Copyright (C) 2004 Marcus Overhagen <marcus@overhagen.de>. All rights reserved.
+ *
+ * Permission to use, copy, modify and distribute this software and its 
+ * documentation for any purpose and without fee is hereby granted, provided
+ * that the above copyright notice appear in all copies, and that both the
+ * copyright notice and this permission notice appear in supporting documentation.
+ *
+ * Marcus Overhagen makes no representations about the suitability of this software
+ * for any purpose. It is provided "as is" without express or implied warranty.
+ *
+ * MARCUS OVERHAGEN DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
+ * ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL MARCUS
+ * OVERHAGEN BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
+ * DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+#ifndef __UTIL_H
+#define __UTIL_H
+
+#include <OS.h>
+
+area_id alloc_mem(void **virt, void **phy, size_t size, uint32 protection, const char *name);
+area_id map_mem(void **virt, void *phy, size_t size, uint32 protection, const char *name);
+
+#endif