Initial import

1 files changed, 204 insertions, 0 deletions

diff --git a/arch/m32r/include/asm/checksum.h b/arch/m32r/include/asm/checksum.h
new file mode 100644
index 000000000..a7a7c4f44
--- /dev/null
+++ b/arch/m32r/include/asm/checksum.h
@@ -0,0 +1,204 @@
+#ifdef __KERNEL__
+#ifndef _ASM_M32R_CHECKSUM_H
+#define _ASM_M32R_CHECKSUM_H
+
+/*
+ * include/asm-m32r/checksum.h
+ *
+ * IP/TCP/UDP checksum routines
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Some code taken from mips and parisc architecture.
+ *
+ *    Copyright (C) 2001, 2002  Hiroyuki Kondo, Hirokazu Takata
+ *    Copyright (C) 2004  Hirokazu Takata <takata at linux-m32r.org>
+ */
+
+#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
+ */
+asmlinkage __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
+ */
+extern __wsum csum_partial_copy_nocheck(const void *src, void *dst,
+                                              int len, __wsum sum);
+
+/*
+ * This is a new version of the above that records errors it finds in *errp,
+ * but continues and zeros thre rest of the buffer.
+ */
+extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
+                                                int len, __wsum sum,
+                                                int *err_ptr);
+
+/*
+ *	Fold a partial checksum
+ */
+
+static inline __sum16 csum_fold(__wsum sum)
+{
+	unsigned long tmpreg;
+	__asm__(
+		"	sll3	%1, %0, #16 \n"
+		"	cmp	%0, %0 \n"
+		"	addx	%0, %1 \n"
+		"	ldi	%1, #0 \n"
+		"	srli	%0, #16 \n"
+		"	addx	%0, %1 \n"
+		"	xor3	%0, %0, #0x0000ffff \n"
+		: "=r" (sum), "=&r" (tmpreg)
+		: "0"  (sum)
+		: "cbit"
+	);
+	return (__force __sum16)sum;
+}
+
+/*
+ * This is a version of ip_compute_csum() optimized for IP headers,
+ * which always checksum on 4 octet boundaries.
+ */
+static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
+{
+	unsigned long tmpreg0, tmpreg1;
+	__wsum sum;
+
+	__asm__ __volatile__(
+		"	ld	%0, @%1+ \n"
+		"	addi	%2, #-4 \n"
+		"#	bgez	%2, 2f \n"
+		"	cmp	%0, %0 \n"
+		"	ld	%3, @%1+ \n"
+		"	ld	%4, @%1+ \n"
+		"	addx	%0, %3 \n"
+		"	ld	%3, @%1+ \n"
+		"	addx	%0, %4 \n"
+		"	addx	%0, %3 \n"
+		"	.fillinsn\n"
+		"1: \n"
+		"	ld	%4, @%1+ \n"
+		"	addi	%2, #-1 \n"
+		"	addx	%0, %4 \n"
+		"	bgtz	%2, 1b \n"
+		"\n"
+		"	ldi	%3, #0 \n"
+		"	addx	%0, %3 \n"
+		"	.fillinsn\n"
+		"2: \n"
+	/* Since the input registers which are loaded with iph and ihl
+	   are modified, we must also specify them as outputs, or gcc
+	   will assume they contain their original values. */
+	: "=&r" (sum), "=r" (iph), "=r" (ihl), "=&r" (tmpreg0), "=&r" (tmpreg1)
+	: "1" (iph), "2" (ihl)
+	: "cbit", "memory");
+
+	return csum_fold(sum);
+}
+
+static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
+					       unsigned short len,
+					       unsigned short proto,
+					       __wsum sum)
+{
+#if defined(__LITTLE_ENDIAN)
+	unsigned long len_proto = (proto + len) << 8;
+#else
+	unsigned long len_proto = proto + len;
+#endif
+	unsigned long tmpreg;
+
+	__asm__(
+		"	cmp	%0, %0 \n"
+		"	addx	%0, %2 \n"
+		"	addx	%0, %3 \n"
+		"	addx	%0, %4 \n"
+		"	ldi	%1, #0 \n"
+		"	addx	%0, %1 \n"
+		: "=r" (sum), "=&r" (tmpreg)
+		: "r" (daddr), "r" (saddr), "r" (len_proto), "0" (sum)
+		: "cbit"
+	);
+
+	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));
+}
+
+/*
+ * 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_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)
+{
+	unsigned long tmpreg0, tmpreg1, tmpreg2, tmpreg3;
+	__asm__(
+		"	ld	%1, @(%5) \n"
+		"	ld	%2, @(4,%5) \n"
+		"	ld	%3, @(8,%5) \n"
+		"	ld	%4, @(12,%5) \n"
+		"	add	%0, %1 \n"
+		"	addx	%0, %2 \n"
+		"	addx	%0, %3 \n"
+		"	addx	%0, %4 \n"
+		"	ld	%1, @(%6) \n"
+		"	ld	%2, @(4,%6) \n"
+		"	ld	%3, @(8,%6) \n"
+		"	ld	%4, @(12,%6) \n"
+		"	addx	%0, %1 \n"
+		"	addx	%0, %2 \n"
+		"	addx	%0, %3 \n"
+		"	addx	%0, %4 \n"
+		"	addx	%0, %7 \n"
+		"	addx	%0, %8 \n"
+		"	ldi	%1, #0 \n"
+		"	addx	%0, %1 \n"
+		: "=&r" (sum), "=&r" (tmpreg0), "=&r" (tmpreg1),
+		  "=&r" (tmpreg2), "=&r" (tmpreg3)
+		: "r" (saddr), "r" (daddr),
+		  "r" (htonl(len)), "r" (htonl(proto)), "0" (sum)
+		: "cbit"
+	);
+
+	return csum_fold(sum);
+}
+
+#endif /* _ASM_M32R_CHECKSUM_H */
+#endif /* __KERNEL__ */