Index: kernel/arch/sparc64/src/proc/thread.c
===================================================================
--- kernel/arch/sparc64/src/proc/thread.c	(revision 32fffef00aa36a7913892cc0d7ff6eff828b2e7e)
+++ kernel/arch/sparc64/src/proc/thread.c	(revision 32fffef00aa36a7913892cc0d7ff6eff828b2e7e)
@@ -0,0 +1,65 @@
+/*
+ * 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 sparc64proc
+ * @{
+ */
+/** @file
+ */
+
+#include <proc/thread.h>
+#include <arch/proc/thread.h>
+#include <mm/frame.h>
+
+void thr_constructor_arch(thread_t *t)
+{
+	/*
+	 * Allocate memory for uspace_window_buffer.
+	 */
+	t->arch.uspace_window_buffer = NULL;
+}
+
+void thr_destructor_arch(thread_t *t)
+{
+	if (t->arch.uspace_window_buffer)
+		frame_free((uintptr_t) t->arch.uspace_window_buffer);
+}
+
+void thread_create_arch(thread_t *t)
+{
+	if ((t->flags & THREAD_FLAG_USPACE) && (!t->arch.uspace_window_buffer)) {
+		/*
+		 * The thread needs userspace window buffer and the object
+		 * returned from the slab allocator doesn't have any.
+		 */
+		t->arch.uspace_window_buffer = frame_alloc(ONE_FRAME, 0);
+	}
+}
+
+/** @}
+ */