Merge branch 'linux-2.6'

1 files changed, 101 insertions, 0 deletions

diff --git a/include/asm-blackfin/checksum.h b/include/asm-blackfin/checksum.h
new file mode 100644
index 000000000000..2638f2586d2f
--- /dev/null
+++ b/include/asm-blackfin/checksum.h
@@ -0,0 +1,101 @@
+#ifndef _BFIN_CHECKSUM_H
+#define _BFIN_CHECKSUM_H
+
+/*
+ * MODIFIED FOR BFIN April 30, 2001 akbar.hussain@lineo.com
+ *
+ * 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 unsigned char *src, unsigned 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 unsigned char *src,
+						unsigned 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)
+{
+	while (sum >> 16)
+		sum = (sum & 0xffff) + (sum >> 16);
+	return ((~(sum << 16)) >> 16);
+}
+
+/*
+ * 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__ ("%0 = %0 + %1;\n\t"
+		 "CC = AC0;\n\t"
+		 "if !CC jump 4;\n\t"
+		 "%0 = %0 + %4;\n\t"
+		 "%0 = %0 + %2;\n\t"
+		 "CC = AC0;\n\t"
+                 "if !CC jump 4;\n\t"
+                 "%0 = %0 + %4;\n\t"
+ 		 "%0 = %0 + %3;\n\t"
+		 "CC = AC0;\n\t"
+                 "if !CC jump 4;\n\t"
+                 "%0 = %0 + %4;\n\t"
+                 "NOP;\n\t"
+ 		 : "=d" (sum)
+		 : "d" (daddr), "d" (saddr), "d" ((ntohs(len)<<16)+proto*256), "d" (1), "0"(sum));
+
+	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				/* _BFIN_CHECKSUM_H */