Index: kernel/arch/sparc64/include/trap/sun4v/regwin.h
===================================================================
--- kernel/arch/sparc64/include/trap/sun4v/regwin.h	(revision eeb643ddb3783861fb3ee6f341c31c048865cfe1)
+++ kernel/arch/sparc64/include/trap/sun4v/regwin.h	(revision eeb643ddb3783861fb3ee6f341c31c048865cfe1)
@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2005 Jakub Jermar
+ * Copyright (c) 2009 Pavel Rimsky
+ * 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 sparc64interrupt
+ * @{
+ */
+#ifndef KERN_sparc64_sun4v_REGWIN_H_
+#define KERN_sparc64_sun4v_REGWIN_H_
+
+#ifdef __ASM__
+
+/*
+ * Saves the contents of the current window to the userspace window buffer.
+ * Does not modify any register window registers, but updates pointer to the
+ * top of the userspace window buffer.
+ *
+ * Parameters:
+ * 	\tmpreg1	global register to be used for scratching purposes
+ * 	\tmpreg2	global register to be used for scratching purposes
+ */
+.macro SAVE_TO_USPACE_WBUF tmpreg1, tmpreg2
+	set SCRATCHPAD_WBUF, \tmpreg2
+	ldxa [\tmpreg2] ASI_SCRATCHPAD, \tmpreg1
+	stx %l0, [\tmpreg1 + L0_OFFSET]	
+	stx %l1, [\tmpreg1 + L1_OFFSET]
+	stx %l2, [\tmpreg1 + L2_OFFSET]
+	stx %l3, [\tmpreg1 + L3_OFFSET]
+	stx %l4, [\tmpreg1 + L4_OFFSET]
+	stx %l5, [\tmpreg1 + L5_OFFSET]
+	stx %l6, [\tmpreg1 + L6_OFFSET]
+	stx %l7, [\tmpreg1 + L7_OFFSET]
+	stx %i0, [\tmpreg1 + I0_OFFSET]
+	stx %i1, [\tmpreg1 + I1_OFFSET]
+	stx %i2, [\tmpreg1 + I2_OFFSET]
+	stx %i3, [\tmpreg1 + I3_OFFSET]
+	stx %i4, [\tmpreg1 + I4_OFFSET]
+	stx %i5, [\tmpreg1 + I5_OFFSET]
+	stx %i6, [\tmpreg1 + I6_OFFSET]
+	stx %i7, [\tmpreg1 + I7_OFFSET]
+	add \tmpreg1, STACK_WINDOW_SAVE_AREA_SIZE, \tmpreg1
+	stxa \tmpreg1, [\tmpreg2] ASI_SCRATCHPAD
+.endm
+
+/*
+ * Macro used to spill userspace window to userspace window buffer.
+ * It is triggered from normal kernel code doing SAVE when
+ * OTHERWIN>0 at (TL=0).
+ */
+.macro SPILL_TO_USPACE_WINDOW_BUFFER
+	SAVE_TO_USPACE_WBUF %g7, %g4
+	saved
+	retry
+.endm
+
+#endif
+
+#endif
+
+/** @}
+ */