Index: uspace/drv/audio/sb16/dma.h
===================================================================
--- uspace/drv/audio/sb16/dma.h	(revision 0f2e7c12c206d68480a6f250bb708a71300fbf8b)
+++ uspace/drv/audio/sb16/dma.h	(revision 0f2e7c12c206d68480a6f250bb708a71300fbf8b)
@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2011 Jan Vesely
+ * 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 drvaudiosb16
+ * @{
+ */
+/** @file
+ * @brief DMA memory management
+ */
+#ifndef DRV_AUDIO_SB16_DMA_H
+#define DRV_AUDIO_SB16_DMA_H
+
+#include <assert.h>
+#include <errno.h>
+#include <malloc.h>
+#include <mem.h>
+#include <as.h>
+
+#define DMA_ALIGNENT 65536
+#define PAGE_SIZE 4096
+
+/** Get physical address translation
+ *
+ * @param[in] addr Virtual address to translate
+ * @return Physical address if exists, NULL otherwise.
+ */
+static inline uintptr_t addr_to_phys(const void *addr)
+{
+	if (addr == NULL)
+		return 0;
+
+	uintptr_t result;
+	const int ret = as_get_physical_mapping(addr, &result);
+	if (ret != EOK)
+		return 0;
+	return (result | ((uintptr_t)addr & 0xfff));
+}
+/*----------------------------------------------------------------------------*/
+/** Physical mallocator simulator
+ *
+ * @param[in] size Size of the required memory space
+ * @return Address of the alligned and big enough memory place, NULL on failure.
+ */
+static inline void * malloc24(size_t size)
+{
+	/* This works only reliably when the host has less than 16MB of memory
+	 * as physical address needs to fit into 24 bits */
+
+	/* If we need more than one page there is no guarantee that the
+	 * memory will be continuous */
+	if (size > PAGE_SIZE)
+		return NULL;
+	/* Calculate alignment to make sure the block won't cross page
+	 * boundary */
+	return memalign(DMA_ALIGNENT, size);
+}
+/*----------------------------------------------------------------------------*/
+/** Physical mallocator simulator
+ *
+ * @param[in] addr Address of the place allocated by malloc32
+ */
+static inline void free24(void *addr)
+	{ free(addr); }
+
+#endif
+/**
+ * @}
+ */
Index: uspace/drv/audio/sb16/dsp.c
===================================================================
--- uspace/drv/audio/sb16/dsp.c	(revision ce1e5ea5c4a6596ba269f133c579877c5a2ad4d7)
+++ uspace/drv/audio/sb16/dsp.c	(revision 0f2e7c12c206d68480a6f250bb708a71300fbf8b)
@@ -34,4 +34,6 @@
 
 #include <libarch/ddi.h>
+
+#include "dma.h"
 #include "ddf_log.h"
 #include "dsp_commands.h"
@@ -127,5 +129,4 @@
 	return EOK;
 }
-
 /**
  * @}