1 files changed, 86 insertions, 0 deletions

diff --git a/include/asm-mn10300/checksum.h b/include/asm-mn10300/checksum.h
new file mode 100644
index 000000000000..9fb2a8d8826a
--- /dev/null
+++ b/include/asm-mn10300/checksum.h
@@ -0,0 +1,86 @@
+/* MN10300 Optimised checksumming code
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#ifndef _ASM_CHECKSUM_H
+#define _ASM_CHECKSUM_H
+
+extern __wsum csum_partial(const void *buff, int len, __wsum sum);
+extern __wsum csum_partial_copy_nocheck(const void *src, void *dst,
+                                        int len, __wsum sum);
+extern __wsum csum_partial_copy_from_user(const void *src, void *dst,
+                                          int len, __wsum sum,
+                                          int *err_ptr);
+extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
+extern __wsum csum_partial(const void *buff, int len, __wsum sum);
+extern __sum16 ip_compute_csum(const void *buff, int len);
+
+#define csum_partial_copy_fromuser csum_partial_copy
+extern __wsum csum_partial_copy(const void *src, void *dst, int len,
+                                __wsum sum);
+
+static inline __sum16 csum_fold(__wsum sum)
+{
+        asm(
+                "       add     %1,%0           \n"
+                "       addc    0xffff,%0       \n"
+                : "=r" (sum)
+                : "r" (sum << 16), "0" (sum & 0xffff0000)
+                : "cc"
+            );
+        return (~sum) >> 16;
+}
+
+static inline __wsum csum_tcpudp_nofold(unsigned long saddr,
+                                        unsigned long daddr,
+                                        unsigned short len,
+                                        unsigned short proto,
+                                        __wsum sum)
+{
+        __wsum tmp;
+
+        tmp = (__wsum) ntohs(len) << 16;
+        tmp += (__wsum) proto << 8;
+
+        asm(
+                "       add     %1,%0           \n"
+                "       addc    %2,%0           \n"
+                "       addc    %3,%0           \n"
+                "       addc    0,%0            \n"
+                : "=r" (sum)
+                : "r" (daddr), "r"(saddr), "r"(tmp), "0"(sum)
+                : "cc"
+            );
+        return sum;
+}
+
+/*
+ * computes the checksum of the TCP/UDP pseudo-header
+ * returns a 16-bit checksum, already complemented
+ */
+static inline __sum16 csum_tcpudp_magic(unsigned long saddr,
+                                        unsigned long daddr,
+                                        unsigned short len,
+                                        unsigned short proto,
+                                        __wsum sum)
+{
+        return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));
+}
+
+#undef _HAVE_ARCH_IPV6_CSUM
+
+/*
+ *      Copy and checksum to user
+ */
+#define HAVE_CSUM_COPY_USER
+extern __wsum csum_and_copy_to_user(const void *src, void *dst, int len,
+                                    __wsum sum, int *err_ptr);
+
+
+#endif /* _ASM_CHECKSUM_H */