From 5374ce802a53785c05a0b7d64ec8aff56a46bd6b Mon Sep 17 00:00:00 2001
From: Miod Vallat <miod@cvs.openbsd.org>
Date: Sat, 5 Aug 2006 10:00:31 +0000
Subject: Use faster {copy,erase}cols routines for smg, with ad hoc vax
 assembly, adapted from X11 via hp300.

---
 sys/arch/vax/vsa/maskbits.h | 101 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 101 insertions(+)
 create mode 100644 sys/arch/vax/vsa/maskbits.h

(limited to 'sys/arch/vax/vsa/maskbits.h')

diff --git a/sys/arch/vax/vsa/maskbits.h b/sys/arch/vax/vsa/maskbits.h
new file mode 100644
index 00000000000..018b8b81060
--- /dev/null
+++ b/sys/arch/vax/vsa/maskbits.h
@@ -0,0 +1,101 @@
+/*	$OpenBSD: maskbits.h,v 1.1 2006/08/05 10:00:30 miod Exp $	*/
+
+/*-
+ * Copyright (c) 1994
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
+ *
+ *	@(#)maskbits.h	8.2 (Berkeley) 3/21/94
+ */
+
+/*
+ * Derived from X11R4
+ */
+
+/* the following notes use the following conventions:
+SCREEN LEFT				SCREEN RIGHT
+in this file and maskbits.c, left and right refer to screen coordinates,
+NOT bit numbering in registers.
+
+rasops_lmask[n]
+	bits[0,n-1] = 0	bits[n,31] = 1
+rasops_rmask[n] =
+	bits[0,n-1] = 1	bits[n,31] = 0
+
+maskbits(x, w, startmask, endmask, nlw)
+	for a span of width w starting at position x, returns
+a mask for ragged bits at start, mask for ragged bits at end,
+and the number of whole longwords between the ends.
+
+*/
+
+#define maskbits(x, w, startmask, endmask, nlw)				\
+do {									\
+	startmask = rasops_lmask[(x) & 0x1f];				\
+	endmask = rasops_rmask[((x) + (w)) & 0x1f];			\
+	if (startmask)							\
+		nlw = (((w) - (32 - ((x) & 0x1f))) >> 5);		\
+	else								\
+		nlw = (w) >> 5;						\
+} while (0)
+
+#define	FASTGETBITS(psrc,x,w,dst)					\
+	__asm__ ("extzv %1,%2,%3,%0"					\
+		: "=g" (dst)						\
+		: "g" (x), "g" (w), "m" (*(char *)(psrc)))
+
+#define	FASTPUTBITS(src, x, w, pdst)					\
+	__asm__ ("insv %3,%1,%2,%0"					\
+		: "=m" (*(char *)(pdst))				\
+		: "g" (x), "g" (w), "g" (src))
+
+#define	RR_CLEAR	0x00
+#define	RR_SET		0x01
+#define	RR_COPY		0x02
+
+#define getandputrop(psrc, srcbit, dstbit, width, pdst, rop)		\
+do {									\
+	unsigned int _tmpdst;						\
+	switch (rop) {							\
+	case RR_CLEAR:							\
+		_tmpdst = 0;						\
+		break;							\
+	case RR_SET:							\
+		_tmpdst = ~0;						\
+		break;							\
+	default:							\
+		FASTGETBITS(psrc, srcbit, width, _tmpdst);		\
+		break;							\
+	}								\
+	FASTPUTBITS(_tmpdst, dstbit, width, pdst);			\
+} while (0)
+
+#define getunalignedword(psrc, x, dst)					\
+do {									\
+        int _tmp;							\
+        FASTGETBITS(psrc, x, 32, _tmp);					\
+        dst = _tmp;							\
+} while (0)
-- 
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