libpayload: BSD solutions contributed by Uwe

Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Jordan Crouse <jordan.crouse@amd.com>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3172 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

1 files changed, 49 insertions, 0 deletions

diff --git a/payloads/libpayload/libc/ipchecksum.c b/payloads/libpayload/libc/ipchecksum.c
new file mode 100644
index 0000000000..caba6aaf34
--- /dev/null
+++ b/payloads/libpayload/libc/ipchecksum.c
@@ -0,0 +1,49 @@
+/*
+ * This file is part of the libpayload project
+ *
+ * Copyright (c) 2001 Charles Mott <cm@linktel.net>
+ * 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 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 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.
+ */
+
+#include <libpayload.h>
+
+unsigned short ipchksum(const unsigned short *ptr, unsigned long nbytes)
+{
+        int sum, oddbyte;
+
+        sum = 0;
+        while (nbytes > 1) {
+                sum += *ptr++;
+                nbytes -= 2;
+        }
+        if (nbytes == 1) {
+                oddbyte = 0;
+                ((u8 *) &oddbyte)[0] = *(u8 *)ptr;
+                ((u8 *) &oddbyte)[1] = 0;
+                sum += oddbyte;
+        }
+        sum = (sum >> 16) + (sum & 0xffff);
+        sum += (sum >> 16);
+        return (~sum);
+}