1 files changed, 167 insertions, 0 deletions

diff --git a/arch/sparc/include/asm/checksum_64.h b/arch/sparc/include/asm/checksum_64.h
new file mode 100644
index 000000000000..019b9615e43c
--- /dev/null
+++ b/arch/sparc/include/asm/checksum_64.h
@@ -0,0 +1,167 @@
+#ifndef __SPARC64_CHECKSUM_H
+#define __SPARC64_CHECKSUM_H
+
+/*  checksum.h:  IP/UDP/TCP checksum routines on the V9.
+ *
+ *  Copyright(C) 1995 Linus Torvalds
+ *  Copyright(C) 1995 Miguel de Icaza
+ *  Copyright(C) 1996 David S. Miller
+ *  Copyright(C) 1996 Eddie C. Dost
+ *  Copyright(C) 1997 Jakub Jelinek
+ *
+ * derived from:
+ *      Alpha checksum c-code
+ *      ix86 inline assembly
+ *      RFC1071 Computing the Internet Checksum
+ */
+
+#include <linux/in6.h>
+#include <asm/uaccess.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
+ */
+extern __wsum csum_partial(const void * buff, int len, __wsum sum);
+
+/* the same as csum_partial, but copies from user space while it
+ * checksums
+ *
+ * here even more important to align src and dst on a 32-bit (or even
+ * better 64-bit) boundary
+ */
+extern __wsum csum_partial_copy_nocheck(const void *src, void *dst,
+                                              int len, __wsum sum);
+
+extern long __csum_partial_copy_from_user(const void __user *src,
+                                          void *dst, int len,
+                                          __wsum sum);
+
+static inline __wsum
+csum_partial_copy_from_user(const void __user *src,
+                            void *dst, int len,
+                            __wsum sum, int *err)
+{
+        long ret = __csum_partial_copy_from_user(src, dst, len, sum);
+        if (ret < 0)
+                *err = -EFAULT;
+        return (__force __wsum) ret;
+}
+
+/*
+ *      Copy and checksum to user
+ */
+#define HAVE_CSUM_COPY_USER
+extern long __csum_partial_copy_to_user(const void *src,
+                                        void __user *dst, int len,
+                                          __wsum sum);
+
+static inline __wsum
+csum_and_copy_to_user(const void *src,
+                      void __user *dst, int len,
+                      __wsum sum, int *err)
+{
+        long ret = __csum_partial_copy_to_user(src, dst, len, sum);
+        if (ret < 0)
+                *err = -EFAULT;
+        return (__force __wsum) ret;
+}
+
+/* ihl is always 5 or greater, almost always is 5, and iph is word aligned
+ * the majority of the time.
+ */
+extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
+
+/* Fold a partial checksum without adding pseudo headers. */
+static inline __sum16 csum_fold(__wsum sum)
+{
+        unsigned int tmp;
+
+        __asm__ __volatile__(
+"       addcc           %0, %1, %1\n"
+"       srl             %1, 16, %1\n"
+"       addc            %1, %%g0, %1\n"
+"       xnor            %%g0, %1, %0\n"
+        : "=&r" (sum), "=r" (tmp)
+        : "0" (sum), "1" ((__force u32)sum<<16)
+        : "cc");
+        return (__force __sum16)sum;
+}
+
+static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
+                                               unsigned int len,
+                                               unsigned short proto,
+                                               __wsum sum)
+{
+        __asm__ __volatile__(
+"       addcc           %1, %0, %0\n"
+"       addccc          %2, %0, %0\n"
+"       addccc          %3, %0, %0\n"
+"       addc            %0, %%g0, %0\n"
+        : "=r" (sum), "=r" (saddr)
+        : "r" (daddr), "r" (proto + len), "0" (sum), "1" (saddr)
+        : "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(__be32 saddr, __be32 daddr,
+                                                   unsigned short len,
+                                                   unsigned short proto,
+                                                   __wsum sum)
+{
+        return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
+}
+
+#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)
+{
+        __asm__ __volatile__ (
+"       addcc           %3, %4, %%g7\n"
+"       addccc          %5, %%g7, %%g7\n"
+"       lduw            [%2 + 0x0c], %%g2\n"
+"       lduw            [%2 + 0x08], %%g3\n"
+"       addccc          %%g2, %%g7, %%g7\n"
+"       lduw            [%2 + 0x04], %%g2\n"
+"       addccc          %%g3, %%g7, %%g7\n"
+"       lduw            [%2 + 0x00], %%g3\n"
+"       addccc          %%g2, %%g7, %%g7\n"
+"       lduw            [%1 + 0x0c], %%g2\n"
+"       addccc          %%g3, %%g7, %%g7\n"
+"       lduw            [%1 + 0x08], %%g3\n"
+"       addccc          %%g2, %%g7, %%g7\n"
+"       lduw            [%1 + 0x04], %%g2\n"
+"       addccc          %%g3, %%g7, %%g7\n"
+"       lduw            [%1 + 0x00], %%g3\n"
+"       addccc          %%g2, %%g7, %%g7\n"
+"       addccc          %%g3, %%g7, %0\n"
+"       addc            0, %0, %0\n"
+        : "=&r" (sum)
+        : "r" (saddr), "r" (daddr), "r"(htonl(len)),
+          "r"(htonl(proto)), "r"(sum)
+        : "g2", "g3", "g7", "cc");
+
+        return csum_fold(sum);
+}
+
+/* this routine is used for miscellaneous IP-like checksums, mainly in icmp.c */
+static inline __sum16 ip_compute_csum(const void *buff, int len)
+{
+        return csum_fold(csum_partial(buff, len, 0));
+}
+
+#endif /* !(__SPARC64_CHECKSUM_H) */