sh: Split out checksum.h in to _32 and _64 variants.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

3 files changed, 298 insertions, 213 deletions

diff --git a/include/asm-sh/checksum.h b/include/asm-sh/checksum.h
index 4bc8357e889..67496ab0ef0 100644
--- a/include/asm-sh/checksum.h
+++ b/include/asm-sh/checksum.h
@@ -1,215 +1,5 @@
-#ifndef __ASM_SH_CHECKSUM_H
-#define __ASM_SH_CHECKSUM_H
-
-/*
- * 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.
- *
- * Copyright (C) 1999 by Kaz Kojima & Niibe Yutaka
- */
-
-#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, and handles user-space pointer exceptions correctly, when needed.
- *
- * here even more important to align src and dst on a 32-bit (or even
- * better 64-bit) boundary
- */
-
-asmlinkage __wsum csum_partial_copy_generic(const void *src, void *dst,
-					    int len, __wsum sum,
-					    int *src_err_ptr, int *dst_err_ptr);
-
-/*
- *	Note: when you get a NULL pointer exception here this means someone
- *	passed in an incorrect kernel address to one of these functions.
- *
- *	If you use these functions directly please don't forget the
- *	access_ok().
- */
-static inline
-__wsum csum_partial_copy_nocheck(const void *src, void *dst,
-				 int len, __wsum sum)
-{
-	return csum_partial_copy_generic(src, dst, len, sum, NULL, NULL);
-}
-
-static inline
-__wsum csum_partial_copy_from_user(const void __user *src, void *dst,
-				   int len, __wsum sum, int *err_ptr)
-{
-	return csum_partial_copy_generic((__force const void *)src, dst,
-					len, sum, err_ptr, NULL);
-}
-
-/*
- *	Fold a partial checksum
- */
-
-static inline __sum16 csum_fold(__wsum sum)
-{
-	unsigned int __dummy;
-	__asm__("swap.w %0, %1\n\t"
-		"extu.w	%0, %0\n\t"
-		"extu.w	%1, %1\n\t"
-		"add	%1, %0\n\t"
-		"swap.w	%0, %1\n\t"
-		"add	%1, %0\n\t"
-		"not	%0, %0\n\t"
-		: "=r" (sum), "=&r" (__dummy)
-		: "0" (sum)
-		: "t");
-	return (__force __sum16)sum;
-}
-
-/*
- *	This is a version of ip_compute_csum() optimized for IP headers,
- *	which always checksum on 4 octet boundaries.
- *
- *      i386 version by Jorge Cwik <jorge@laser.satlink.net>, adapted
- *      for linux by * Arnt Gulbrandsen.
- */
-static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
-{
-	unsigned int sum, __dummy0, __dummy1;
-
-	__asm__ __volatile__(
-		"mov.l	@%1+, %0\n\t"
-		"mov.l	@%1+, %3\n\t"
-		"add	#-2, %2\n\t"
-		"clrt\n\t"
-		"1:\t"
-		"addc	%3, %0\n\t"
-		"movt	%4\n\t"
-		"mov.l	@%1+, %3\n\t"
-		"dt	%2\n\t"
-		"bf/s	1b\n\t"
-		" cmp/eq #1, %4\n\t"
-		"addc	%3, %0\n\t"
-		"addc	%2, %0"	    /* Here %2 is 0, add carry-bit */
-	/* 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" (__dummy0), "=&z" (__dummy1)
-	: "1" (iph), "2" (ihl)
-	: "t");
-
-	return	csum_fold(sum);
-}
-
-static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
-					unsigned short len,
-					unsigned short proto,
-					__wsum sum)
-{
-#ifdef __LITTLE_ENDIAN__
-	unsigned long len_proto = (proto + len) << 8;
+#ifdef CONFIG_SUPERH32
+# include "checksum_32.h"
 #else
-	unsigned long len_proto = proto + len;
+# include "checksum_64.h"
 #endif
-	__asm__("clrt\n\t"
-		"addc	%0, %1\n\t"
-		"addc	%2, %1\n\t"
-		"addc	%3, %1\n\t"
-		"movt	%0\n\t"
-		"add	%1, %0"
-		: "=r" (sum), "=r" (len_proto)
-		: "r" (daddr), "r" (saddr), "1" (len_proto), "0" (sum)
-		: "t");
-
-	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 int __dummy;
-	__asm__("clrt\n\t"
-		"mov.l	@(0,%2), %1\n\t"
-		"addc	%1, %0\n\t"
-		"mov.l	@(4,%2), %1\n\t"
-		"addc	%1, %0\n\t"
-		"mov.l	@(8,%2), %1\n\t"
-		"addc	%1, %0\n\t"
-		"mov.l	@(12,%2), %1\n\t"
-		"addc	%1, %0\n\t"
-		"mov.l	@(0,%3), %1\n\t"
-		"addc	%1, %0\n\t"
-		"mov.l	@(4,%3), %1\n\t"
-		"addc	%1, %0\n\t"
-		"mov.l	@(8,%3), %1\n\t"
-		"addc	%1, %0\n\t"
-		"mov.l	@(12,%3), %1\n\t"
-		"addc	%1, %0\n\t"
-		"addc	%4, %0\n\t"
-		"addc	%5, %0\n\t"
-		"movt	%1\n\t"
-		"add	%1, %0\n"
-		: "=r" (sum), "=&r" (__dummy)
-		: "r" (saddr), "r" (daddr),
-		  "r" (htonl(len)), "r" (htonl(proto)), "0" (sum)
-		: "t");
-
-	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)
-{
-	if (access_ok(VERIFY_WRITE, dst, len))
-		return csum_partial_copy_generic((__force const void *)src,
-						dst, len, sum, NULL, err_ptr);
-
-	if (len)
-		*err_ptr = -EFAULT;
-
-	return (__force __wsum)-1; /* invalid checksum */
-}
-#endif /* __ASM_SH_CHECKSUM_H */
diff --git a/include/asm-sh/checksum_32.h b/include/asm-sh/checksum_32.h
new file mode 100644
index 00000000000..4bc8357e889
--- /dev/null
+++ b/include/asm-sh/checksum_32.h
@@ -0,0 +1,215 @@
+#ifndef __ASM_SH_CHECKSUM_H
+#define __ASM_SH_CHECKSUM_H
+
+/*
+ * 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.
+ *
+ * Copyright (C) 1999 by Kaz Kojima & Niibe Yutaka
+ */
+
+#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, and handles user-space pointer exceptions correctly, when needed.
+ *
+ * here even more important to align src and dst on a 32-bit (or even
+ * better 64-bit) boundary
+ */
+
+asmlinkage __wsum csum_partial_copy_generic(const void *src, void *dst,
+					    int len, __wsum sum,
+					    int *src_err_ptr, int *dst_err_ptr);
+
+/*
+ *	Note: when you get a NULL pointer exception here this means someone
+ *	passed in an incorrect kernel address to one of these functions.
+ *
+ *	If you use these functions directly please don't forget the
+ *	access_ok().
+ */
+static inline
+__wsum csum_partial_copy_nocheck(const void *src, void *dst,
+				 int len, __wsum sum)
+{
+	return csum_partial_copy_generic(src, dst, len, sum, NULL, NULL);
+}
+
+static inline
+__wsum csum_partial_copy_from_user(const void __user *src, void *dst,
+				   int len, __wsum sum, int *err_ptr)
+{
+	return csum_partial_copy_generic((__force const void *)src, dst,
+					len, sum, err_ptr, NULL);
+}
+
+/*
+ *	Fold a partial checksum
+ */
+
+static inline __sum16 csum_fold(__wsum sum)
+{
+	unsigned int __dummy;
+	__asm__("swap.w %0, %1\n\t"
+		"extu.w	%0, %0\n\t"
+		"extu.w	%1, %1\n\t"
+		"add	%1, %0\n\t"
+		"swap.w	%0, %1\n\t"
+		"add	%1, %0\n\t"
+		"not	%0, %0\n\t"
+		: "=r" (sum), "=&r" (__dummy)
+		: "0" (sum)
+		: "t");
+	return (__force __sum16)sum;
+}
+
+/*
+ *	This is a version of ip_compute_csum() optimized for IP headers,
+ *	which always checksum on 4 octet boundaries.
+ *
+ *      i386 version by Jorge Cwik <jorge@laser.satlink.net>, adapted
+ *      for linux by * Arnt Gulbrandsen.
+ */
+static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
+{
+	unsigned int sum, __dummy0, __dummy1;
+
+	__asm__ __volatile__(
+		"mov.l	@%1+, %0\n\t"
+		"mov.l	@%1+, %3\n\t"
+		"add	#-2, %2\n\t"
+		"clrt\n\t"
+		"1:\t"
+		"addc	%3, %0\n\t"
+		"movt	%4\n\t"
+		"mov.l	@%1+, %3\n\t"
+		"dt	%2\n\t"
+		"bf/s	1b\n\t"
+		" cmp/eq #1, %4\n\t"
+		"addc	%3, %0\n\t"
+		"addc	%2, %0"	    /* Here %2 is 0, add carry-bit */
+	/* 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" (__dummy0), "=&z" (__dummy1)
+	: "1" (iph), "2" (ihl)
+	: "t");
+
+	return	csum_fold(sum);
+}
+
+static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
+					unsigned short len,
+					unsigned short proto,
+					__wsum sum)
+{
+#ifdef __LITTLE_ENDIAN__
+	unsigned long len_proto = (proto + len) << 8;
+#else
+	unsigned long len_proto = proto + len;
+#endif
+	__asm__("clrt\n\t"
+		"addc	%0, %1\n\t"
+		"addc	%2, %1\n\t"
+		"addc	%3, %1\n\t"
+		"movt	%0\n\t"
+		"add	%1, %0"
+		: "=r" (sum), "=r" (len_proto)
+		: "r" (daddr), "r" (saddr), "1" (len_proto), "0" (sum)
+		: "t");
+
+	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 int __dummy;
+	__asm__("clrt\n\t"
+		"mov.l	@(0,%2), %1\n\t"
+		"addc	%1, %0\n\t"
+		"mov.l	@(4,%2), %1\n\t"
+		"addc	%1, %0\n\t"
+		"mov.l	@(8,%2), %1\n\t"
+		"addc	%1, %0\n\t"
+		"mov.l	@(12,%2), %1\n\t"
+		"addc	%1, %0\n\t"
+		"mov.l	@(0,%3), %1\n\t"
+		"addc	%1, %0\n\t"
+		"mov.l	@(4,%3), %1\n\t"
+		"addc	%1, %0\n\t"
+		"mov.l	@(8,%3), %1\n\t"
+		"addc	%1, %0\n\t"
+		"mov.l	@(12,%3), %1\n\t"
+		"addc	%1, %0\n\t"
+		"addc	%4, %0\n\t"
+		"addc	%5, %0\n\t"
+		"movt	%1\n\t"
+		"add	%1, %0\n"
+		: "=r" (sum), "=&r" (__dummy)
+		: "r" (saddr), "r" (daddr),
+		  "r" (htonl(len)), "r" (htonl(proto)), "0" (sum)
+		: "t");
+
+	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)
+{
+	if (access_ok(VERIFY_WRITE, dst, len))
+		return csum_partial_copy_generic((__force const void *)src,
+						dst, len, sum, NULL, err_ptr);
+
+	if (len)
+		*err_ptr = -EFAULT;
+
+	return (__force __wsum)-1; /* invalid checksum */
+}
+#endif /* __ASM_SH_CHECKSUM_H */
diff --git a/include/asm-sh/checksum_64.h b/include/asm-sh/checksum_64.h
new file mode 100644
index 00000000000..ec79b92e6bd
--- /dev/null
+++ b/include/asm-sh/checksum_64.h
@@ -0,0 +1,80 @@
+#ifndef __ASM_SH64_CHECKSUM_H
+#define __ASM_SH64_CHECKSUM_H
+
+/*
+ * 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.
+ *
+ * include/asm-sh64/checksum.h
+ *
+ * Copyright (C) 2000, 2001  Paolo Alberelli
+ *
+ */
+
+/*
+ * 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);
+
+/*
+ *	Note: when you get a NULL pointer exception here this means someone
+ *	passed in an incorrect kernel address to one of these functions.
+ *
+ *	If you use these functions directly please don't forget the
+ *	access_ok().
+ */
+
+
+__wsum csum_partial_copy_nocheck(const void *src, void *dst, int len,
+				       __wsum sum);
+
+__wsum csum_partial_copy_from_user(const void __user *src, void *dst,
+					 int len, __wsum sum, int *err_ptr);
+
+static inline __sum16 csum_fold(__wsum csum)
+{
+	u32 sum = (__force u32)csum;
+        sum = (sum & 0xffff) + (sum >> 16);
+        sum = (sum & 0xffff) + (sum >> 16);
+        return (__force __sum16)~sum;
+}
+
+__sum16 ip_fast_csum(const void *iph, unsigned int ihl);
+
+__wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
+				 unsigned short len, unsigned short proto,
+				 __wsum 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));
+}
+
+#endif /* __ASM_SH64_CHECKSUM_H */
+