1 files changed, 105 insertions, 0 deletions
diff --git a/include/asm-h8300/checksum.h b/include/asm-h8300/checksum.h
new file mode 100644
index 0000000..3051931
--- /dev/null
+++ b/include/asm-h8300/checksum.h
@@ -0,0 +1,105 @@
+#ifndef _H8300_CHECKSUM_H
+#define _H8300_CHECKSUM_H
+
+/*
+ * computes the checksum of a memory block at buff, length len,
+ * and adds in "sum" (32-bit)
+ *
+ * returns a 32-bit number suitable for feeding into itself
+ * or csum_tcpudp_magic
+ *
+ * this function must be called with even lengths, except
+ * for the last fragment, which may be odd
+ *
+ * it's best to have buff aligned on a 32-bit boundary
+ */
+unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum);
+
+/*
+ * the same as csum_partial, but copies from src while it
+ * checksums
+ *
+ * here even more important to align src and dst on a 32-bit (or even
+ * better 64-bit) boundary
+ */
+
+unsigned int csum_partial_copy(const char *src, char *dst, int len, int sum);
+
+
+/*
+ * the same as csum_partial_copy, but copies from user space.
+ *
+ * here even more important to align src and dst on a 32-bit (or even
+ * better 64-bit) boundary
+ */
+
+extern unsigned int csum_partial_copy_from_user(const char *src, char *dst,
+						int len, int sum, int *csum_err);
+
+#define csum_partial_copy_nocheck(src, dst, len, sum)	\
+	csum_partial_copy((src), (dst), (len), (sum))
+
+unsigned short ip_fast_csum(unsigned char *iph, unsigned int ihl);
+
+
+/*
+ *	Fold a partial checksum
+ */
+
+static inline unsigned int csum_fold(unsigned int sum)
+{
+	__asm__("mov.l %0,er0\n\t"
+		"add.w e0,r0\n\t"
+		"xor.w e0,e0\n\t"
+		"rotxl.w e0\n\t"
+		"add.w e0,r0\n\t"
+		"sub.w e0,e0\n\t"
+		"mov.l er0,%0"
+		: "=r"(sum)
+		: "0"(sum)
+		: "er0");
+	return ~sum;
+}
+
+
+/*
+ * computes the checksum of the TCP/UDP pseudo-header
+ * returns a 16-bit checksum, already complemented
+ */
+
+static inline unsigned int
+csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned short len,
+		  unsigned short proto, unsigned int sum)
+{
+	__asm__ ("sub.l er0,er0\n\t"
+		 "add.l %2,%0\n\t"
+		 "addx	#0,r0l\n\t"
+		 "add.l	%3,%0\n\t"
+		 "addx	#0,r0l\n\t"
+		 "add.l %4,%0\n\t"
+		 "addx	#0,r0l\n\t"
+		 "add.l	er0,%0\n\t"
+		 "bcc	1f\n\t"
+		 "inc.l	#1,%0\n"
+		 "1:"
+		 : "=&r" (sum)
+		 : "0" (sum), "r" (daddr), "r" (saddr), "r" (len + proto)
+		 :"er0");
+	return sum;
+}
+
+static inline unsigned short int
+csum_tcpudp_magic(unsigned long saddr, unsigned long daddr, unsigned short len,
+		  unsigned short proto, unsigned int sum)
+{
+	return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
+}
+
+/*
+ * this routine is used for miscellaneous IP-like checksums, mainly
+ * in icmp.c
+ */
+
+extern unsigned short ip_compute_csum(const unsigned char * buff, int len);
+
+#endif /* _H8300_CHECKSUM_H */