sh: migrate to arch/sh/include/

This follows the sparc changes a439fe51a1f8eb087c22dd24d69cebae4a3addac.

Most of the moving about was done with Sam's directions at:

http://marc.info/?l=linux-sh&m=121724823706062&w=2

with subsequent hacking and fixups entirely my fault.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 215 insertions, 0 deletions

diff --git a/arch/sh/include/asm/checksum_32.h b/arch/sh/include/asm/checksum_32.h
new file mode 100644
index 000000000000..14b7ac2f0a07
--- /dev/null
+++ b/arch/sh/include/asm/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", "memory");
+
+        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 */