1 files changed, 133 insertions, 0 deletions

diff --git a/include/asm-m68knommu/checksum.h b/include/asm-m68knommu/checksum.h
new file mode 100644
index 000000000000..92cf102c2534
--- /dev/null
+++ b/include/asm-m68knommu/checksum.h
@@ -0,0 +1,133 @@
+#ifndef _M68K_CHECKSUM_H
+#define _M68K_CHECKSUM_H
+
+#include <linux/in6.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)
+{
+#ifdef CONFIG_COLDFIRE
+        sum = (sum & 0xffff) + (sum >> 16);
+        sum = (sum & 0xffff) + (sum >> 16);
+#else
+        unsigned int tmp = sum;
+        __asm__("swap %1\n\t"
+                "addw %1, %0\n\t"
+                "clrw %1\n\t"
+                "addxw %1, %0"
+                : "=&d" (sum), "=&d" (tmp)
+                : "0" (sum), "1" (sum));
+#endif
+        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__ ("addl  %1,%0\n\t"
+                 "addxl %4,%0\n\t"
+                 "addxl %5,%0\n\t"
+                 "clrl %1\n\t"
+                 "addxl %1,%0"
+                 : "=&d" (sum), "=&d" (saddr)
+                 : "0" (daddr), "1" (saddr), "d" (len + proto),
+                   "d"(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);
+
+#define _HAVE_ARCH_IPV6_CSUM
+static __inline__ unsigned short int
+csum_ipv6_magic(struct in6_addr *saddr, struct in6_addr *daddr,
+                __u32 len, unsigned short proto, unsigned int sum) 
+{
+        register unsigned long tmp;
+        __asm__("addl %2@,%0\n\t"
+                "movel %2@(4),%1\n\t"
+                "addxl %1,%0\n\t"
+                "movel %2@(8),%1\n\t"
+                "addxl %1,%0\n\t"
+                "movel %2@(12),%1\n\t"
+                "addxl %1,%0\n\t"
+                "movel %3@,%1\n\t"
+                "addxl %1,%0\n\t"
+                "movel %3@(4),%1\n\t"
+                "addxl %1,%0\n\t"
+                "movel %3@(8),%1\n\t"
+                "addxl %1,%0\n\t"
+                "movel %3@(12),%1\n\t"
+                "addxl %1,%0\n\t"
+                "addxl %4,%0\n\t"
+                "clrl %1\n\t"
+                "addxl %1,%0"
+                : "=&d" (sum), "=&d" (tmp)
+                : "a" (saddr), "a" (daddr), "d" (len + proto),
+                  "0" (sum));
+
+        return csum_fold(sum);
+}
+
+#endif /* _M68K_CHECKSUM_H */