Index: kernel/arch/sparc64/include/arch/drivers/niagara_buf.h
===================================================================
--- kernel/arch/sparc64/include/arch/drivers/niagara_buf.h	(revision 40feeac3d6d981d671abe77b20b3aa999c586faf)
+++ kernel/arch/sparc64/include/arch/drivers/niagara_buf.h	(revision 40feeac3d6d981d671abe77b20b3aa999c586faf)
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2008 Pavel Rimsky
+ * Copyright (c) 2017 Jiri Svoboda
+ * 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 sparc64
+ * @{
+ */
+/**
+ * @file
+ * @brief Niagara input/output buffer shared between kernel and user space
+ */
+
+#ifdef KERNEL
+#include <mm/as.h>
+#else
+#include <as.h>
+#endif
+
+#include <stdint.h>
+
+#define OUTPUT_BUFFER_SIZE  ((PAGE_SIZE) - 2 * 8)
+
+typedef struct {
+	uint64_t read_ptr;
+	uint64_t write_ptr;
+	char data[OUTPUT_BUFFER_SIZE];
+} __attribute__ ((packed)) niagara_output_buffer_t;
+
+#define INPUT_BUFFER_SIZE  ((PAGE_SIZE) - 2 * 8)
+
+typedef struct {
+	uint64_t write_ptr;
+	uint64_t read_ptr;
+	char data[INPUT_BUFFER_SIZE];
+} __attribute__ ((packed)) niagara_input_buffer_t;
+
+/** @}
+ */