1 files changed, 144 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 000000000..d6b59461e
--- /dev/null
+++ b/arch/sparc/include/asm/checksum_64.h
@@ -0,0 +1,144 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#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 <linux/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
+ */
+__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
+ */
+__wsum csum_partial_copy_nocheck(const void *src, void *dst, int len);
+__wsum csum_and_copy_from_user(const void __user *src, void *dst, int len);
+__wsum csum_and_copy_to_user(const void *src, void __user *dst, int len);
+
+/* ihl is always 5 or greater, almost always is 5, and iph is word aligned
+ * the majority of the time.
+ */
+__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,
+					__u32 len, __u8 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,
+					__u32 len, __u8 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, __u8 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));
+}
+
+#define HAVE_ARCH_CSUM_ADD
+static inline __wsum csum_add(__wsum csum, __wsum addend)
+{
+	__asm__ __volatile__(
+		"addcc   %0, %1, %0\n"
+		"addx    %0, %%g0, %0"
+		: "=r" (csum)
+		: "r" (addend), "0" (csum));
+
+	return csum;
+}
+
+#endif /* !(__SPARC64_CHECKSUM_H) */