Add optimized implementations of in_cksum_skip() and related functions

for sparc64.

1 files changed, 173 insertions, 0 deletions

diff --git a/sys/sparc64/include/in_cksum.h b/sys/sparc64/include/in_cksum.h
new file mode 100644
index 0000000..5c658ac
--- /dev/null
+++ b/sys/sparc64/include/in_cksum.h
@@ -0,0 +1,173 @@
+/*-
+ * Copyright (c) 1990 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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. 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.
+ */
+/*-
+ * Copyright (c) 2001 by Thomas Moestl <tmm@FreeBSD.org>.
+ * 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.
+ *
+ * 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 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.
+ *
+ *	from tahoe:	in_cksum.c	1.2	86/01/05
+ *	from:		@(#)in_cksum.c	1.3 (Berkeley) 1/19/91
+ *	from: Id: in_cksum.c,v 1.8 1995/12/03 18:35:19 bde Exp
+ *	from: FreeBSD: src/sys/alpha/include/in_cksum.h,v 1.5 2000/05/06
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _MACHINE_IN_CKSUM_H_
+#define	_MACHINE_IN_CKSUM_H_	1
+
+#include <sys/cdefs.h>
+
+#define in_cksum(m, len)	in_cksum_skip(m, len, 0)
+
+static __inline void
+in_cksum_update(struct ip *ip)
+{
+	int __tmp;
+
+	__tmp = (int)ip->ip_sum + 1;
+	ip->ip_sum = __tmp + (__tmp >> 16);
+}
+
+static __inline u_short
+in_addword(u_short sum, u_short b)
+{
+	u_long __ret, __tmp;
+
+	__asm(
+	    "sll %2, 16, %0\n"
+	    "sll %3, 16, %1\n"
+	    "addcc %0, %1, %0\n"
+	    "srl %0, 16, %0\n"
+	    "addc %0, 0, %0\n"
+	    : "=r" (__ret), "=r" (__tmp) : "r" (sum), "r" (b));
+	return (__ret);
+}
+
+static __inline u_short
+in_pseudo(u_int sum, u_int b, u_int c)
+{
+	u_long __tmp;
+		    
+	__asm(
+	    "addcc %0, %3, %0\n"
+	    "addccc %0, %4, %0\n"
+	    "addc %0, 0, %0\n"
+	    "sll %0, 16, %1\n"
+	    "addcc %0, %1, %0\n"
+	    "srl %0, 16, %0\n"
+	    "addc %0, 0, %0\n"
+	    : "=r" (sum), "=r" (__tmp) : "0" (sum), "r" (b), "r" (c));
+	return (sum);
+}
+
+static __inline u_int
+in_cksum_hdr(struct ip *ip)
+{
+	u_long __ret, __tmp1, __tmp2, __tmp3, __tmp4;
+
+	/*
+	 * Use 32 bit memory accesses and additions - addition with carry only
+	 * works for 32 bits, and fixing up alignent issues for 64 is probably
+	 * more trouble than it's worth.
+	 * This may read outside of the ip header, but does not cross a page
+	 * boundary in doing so, so that should be OK.
+	 * Actually, this specialized implementation might be overkill - using
+	 * a generic implementation for both in_cksum_skip and in_cksum_hdr
+	 * should not be too much more expensive.
+	 */
+#define __LD_ADD(addr, tmp, sum, offs, mod) \
+    "lduw [" #addr " + " #offs "], " #tmp "\n" \
+    "add" # mod " " #sum ", " #tmp ", " #sum "\n"
+
+	__asm(
+	    "and %5, 3, %3\n"
+	    "andn %5, 3, %1\n"
+	    "brz,pt %3, 0f\n"
+	    " lduw [%1], %0\n"
+	    "mov 4, %4\n"
+	    "sub %4, %3, %4\n"
+	    "sll %4, 3, %4\n"		/* fix up unaligned buffers */
+	    "mov 1, %2\n"
+	    "sll %2, %4, %4\n"
+	    "sub %4, 1, %4\n"
+	    "lduw [%1 + 20], %2\n"
+	    "andn %2, %4, %2\n"
+	    "and %0, %4, %0\n"
+	    "or %0, %2, %0\n"
+	    "0:\n"
+	    __LD_ADD(%1, %2, %0, 4, cc)
+	    __LD_ADD(%1, %2, %0, 8, ccc)
+	    __LD_ADD(%1, %2, %0, 12, ccc)
+	    __LD_ADD(%1, %2, %0, 16, ccc)
+	    "addc %0, 0, %0\n"		/* reduce */
+	    "1:\n"
+	    "sll %0, 16, %2\n"
+	    "addcc %0, %2, %0\n"
+	    "srl %0, 16, %0\n"
+	    "addc %0, 0, %0\n"
+	    "andcc %3, 1, %3\n"		/* need to byte-swap? */
+	    "clr %3\n"
+	    "bne,a,pn %%xcc, 1b\n"
+	    " sll %0, 8, %0\n"
+	    "not %0\n"
+	    "sll %0, 16, %0\n"
+	    "srl %0, 16, %0\n"
+	    : "=r" (__ret), "=r" (__tmp1), "=r" (__tmp2), "=r" (__tmp3),
+		"=r" (__tmp4) : "1" (ip));
+#undef __LD_ADD
+	return (__ret);
+}
+
+u_short	in_cksum_skip(struct mbuf *m, int len, int skip);
+
+#endif /* _MACHINE_IN_CKSUM_H_ */