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-rw-r--r--arch/m68knommu/include/asm/checksum.h132
1 files changed, 132 insertions, 0 deletions
diff --git a/arch/m68knommu/include/asm/checksum.h b/arch/m68knommu/include/asm/checksum.h
new file mode 100644
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+++ b/arch/m68knommu/include/asm/checksum.h
@@ -0,0 +1,132 @@
+#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
+ */
+__wsum csum_partial(const void *buff, int len, __wsum 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
+ */
+
+__wsum csum_partial_copy_nocheck(const void *src, void *dst,
+ int len, __wsum 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 __wsum csum_partial_copy_from_user(const void __user *src,
+ void *dst, int len, __wsum sum, int *csum_err);
+
+__sum16 ip_fast_csum(const void *iph, unsigned int ihl);
+
+/*
+ * Fold a partial checksum
+ */
+
+static inline __sum16 csum_fold(__wsum sum)
+{
+ unsigned int tmp = (__force u32)sum;
+#ifdef CONFIG_COLDFIRE
+ tmp = (tmp & 0xffff) + (tmp >> 16);
+ tmp = (tmp & 0xffff) + (tmp >> 16);
+ return (__force __sum16)~tmp;
+#else
+ __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));
+ return (__force __sum16)~sum;
+#endif
+}
+
+
+/*
+ * computes the checksum of the TCP/UDP pseudo-header
+ * returns a 16-bit checksum, already complemented
+ */
+
+static inline __wsum
+csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
+ unsigned short proto, __wsum 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 __sum16
+csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len,
+ unsigned short proto, __wsum 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 __sum16 ip_compute_csum(const void *buff, int len);
+
+#define _HAVE_ARCH_IPV6_CSUM
+static __inline__ __sum16
+csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr,
+ __u32 len, unsigned short proto, __wsum 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 */
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