Initial import

1 files changed, 210 insertions, 0 deletions

diff --git a/arch/parisc/include/asm/checksum.h b/arch/parisc/include/asm/checksum.h
new file mode 100644
index 000000000..c84b2fcb1
--- /dev/null
+++ b/arch/parisc/include/asm/checksum.h
@@ -0,0 +1,210 @@
+#ifndef _PARISC_CHECKSUM_H
+#define _PARISC_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
+ */
+extern __wsum csum_partial(const void *, int, __wsum);
+
+/*
+ * 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 *, void *, int, __wsum);
+
+/*
+ * this is a new version of the above that records errors it finds in *errp,
+ * but continues and zeros the rest of the buffer.
+ */
+extern __wsum csum_partial_copy_from_user(const void __user *src,
+		void *dst, int len, __wsum sum, int *errp);
+
+/*
+ *	Optimized for IP headers, which always checksum on 4 octet boundaries.
+ *
+ *	Written by Randolph Chung <tausq@debian.org>, and then mucked with by
+ *	LaMont Jones <lamont@debian.org>
+ */
+static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
+{
+	unsigned int sum;
+
+	__asm__ __volatile__ (
+"	ldws,ma		4(%1), %0\n"
+"	addib,<=	-4, %2, 2f\n"
+"\n"
+"	ldws		4(%1), %%r20\n"
+"	ldws		8(%1), %%r21\n"
+"	add		%0, %%r20, %0\n"
+"	ldws,ma		12(%1), %%r19\n"
+"	addc		%0, %%r21, %0\n"
+"	addc		%0, %%r19, %0\n"
+"1:	ldws,ma		4(%1), %%r19\n"
+"	addib,<		0, %2, 1b\n"
+"	addc		%0, %%r19, %0\n"
+"\n"
+"	extru		%0, 31, 16, %%r20\n"
+"	extru		%0, 15, 16, %%r21\n"
+"	addc		%%r20, %%r21, %0\n"
+"	extru		%0, 15, 16, %%r21\n"
+"	add		%0, %%r21, %0\n"
+"	subi		-1, %0, %0\n"
+"2:\n"
+	: "=r" (sum), "=r" (iph), "=r" (ihl)
+	: "1" (iph), "2" (ihl)
+	: "r19", "r20", "r21", "memory");
+
+	return (__force __sum16)sum;
+}
+
+/*
+ *	Fold a partial checksum
+ */
+static inline __sum16 csum_fold(__wsum csum)
+{
+	u32 sum = (__force u32)csum;
+	/* add the swapped two 16-bit halves of sum,
+	   a possible carry from adding the two 16-bit halves,
+	   will carry from the lower half into the upper half,
+	   giving us the correct sum in the upper half. */
+	sum += (sum << 16) + (sum >> 16);
+	return (__force __sum16)(~sum >> 16);
+}
+ 
+static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
+					       unsigned short len,
+					       unsigned short proto,
+					       __wsum sum)
+{
+	__asm__(
+	"	add  %1, %0, %0\n"
+	"	addc %2, %0, %0\n"
+	"	addc %3, %0, %0\n"
+	"	addc %%r0, %0, %0\n"
+		: "=r" (sum)
+		: "r" (daddr), "r"(saddr), "r"(proto+len), "0"(sum));
+	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 *buf, int len)
+{
+	 return csum_fold (csum_partial(buf, 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)
+{
+	__asm__ __volatile__ (
+
+#if BITS_PER_LONG > 32
+
+	/*
+	** We can execute two loads and two adds per cycle on PA 8000.
+	** But add insn's get serialized waiting for the carry bit.
+	** Try to keep 4 registers with "live" values ahead of the ALU.
+	*/
+
+"	ldd,ma		8(%1), %%r19\n"	/* get 1st saddr word */
+"	ldd,ma		8(%2), %%r20\n"	/* get 1st daddr word */
+"	add		%8, %3, %3\n"/* add 16-bit proto + len */
+"	add		%%r19, %0, %0\n"
+"	ldd,ma		8(%1), %%r21\n"	/* 2cd saddr */
+"	ldd,ma		8(%2), %%r22\n"	/* 2cd daddr */
+"	add,dc		%%r20, %0, %0\n"
+"	add,dc		%%r21, %0, %0\n"
+"	add,dc		%%r22, %0, %0\n"
+"	add,dc		%3, %0, %0\n"  /* fold in proto+len | carry bit */
+"	extrd,u		%0, 31, 32, %%r19\n"	/* copy upper half down */
+"	depdi		0, 31, 32, %0\n"	/* clear upper half */
+"	add		%%r19, %0, %0\n"	/* fold into 32-bits */
+"	addc		0, %0, %0\n"		/* add carry */
+
+#else
+
+	/*
+	** For PA 1.x, the insn order doesn't matter as much.
+	** Insn stream is serialized on the carry bit here too.
+	** result from the previous operation (eg r0 + x)
+	*/
+
+"	ldw,ma		4(%1), %%r19\n"	/* get 1st saddr word */
+"	ldw,ma		4(%2), %%r20\n"	/* get 1st daddr word */
+"	add		%8, %3, %3\n"	/* add 16-bit proto + len */
+"	add		%%r19, %0, %0\n"
+"	ldw,ma		4(%1), %%r21\n"	/* 2cd saddr */
+"	addc		%%r20, %0, %0\n"
+"	ldw,ma		4(%2), %%r22\n"	/* 2cd daddr */
+"	addc		%%r21, %0, %0\n"
+"	ldw,ma		4(%1), %%r19\n"	/* 3rd saddr */
+"	addc		%%r22, %0, %0\n"
+"	ldw,ma		4(%2), %%r20\n"	/* 3rd daddr */
+"	addc		%%r19, %0, %0\n"
+"	ldw,ma		4(%1), %%r21\n"	/* 4th saddr */
+"	addc		%%r20, %0, %0\n"
+"	ldw,ma		4(%2), %%r22\n"	/* 4th daddr */
+"	addc		%%r21, %0, %0\n"
+"	addc		%%r22, %0, %0\n"
+"	addc		%3, %0, %0\n"	/* fold in proto+len, catch carry */
+
+#endif
+	: "=r" (sum), "=r" (saddr), "=r" (daddr), "=r" (len)
+	: "0" (sum), "1" (saddr), "2" (daddr), "3" (len), "r" (proto)
+	: "r19", "r20", "r21", "r22", "memory");
+	return csum_fold(sum);
+}
+
+/* 
+ *	Copy and checksum to user
+ */
+#define HAVE_CSUM_COPY_USER
+static __inline__ __wsum csum_and_copy_to_user(const void *src,
+						      void __user *dst,
+						      int len, __wsum sum,
+						      int *err_ptr)
+{
+	/* code stolen from include/asm-mips64 */
+	sum = csum_partial(src, len, sum);
+	 
+	if (copy_to_user(dst, src, len)) {
+		*err_ptr = -EFAULT;
+		return (__force __wsum)-1;
+	}
+
+	return sum;
+}
+
+#endif
+