[PATCH] frv: implement and export various things required by modules

Export a number of features required to build all the modules.  It also
implements the following simple features:

 (*) csum_partial_copy_from_user() for MMU as well as no-MMU.

 (*) __ucmpdi2().

so that they can be exported too.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 71 insertions, 7 deletions

diff --git a/arch/frv/lib/Makefile b/arch/frv/lib/Makefile
index 19be2626d5e6..08be305c9f44 100644
--- a/arch/frv/lib/Makefile
+++ b/arch/frv/lib/Makefile
@@ -3,6 +3,6 @@
 #
 
 lib-y := \
-        __ashldi3.o __lshrdi3.o __muldi3.o __ashrdi3.o __negdi2.o \
+        __ashldi3.o __lshrdi3.o __muldi3.o __ashrdi3.o __negdi2.o __ucmpdi2.o \
         checksum.o memcpy.o memset.o atomic-ops.o \
         outsl_ns.o outsl_sw.o insl_ns.o insl_sw.o cache.o
diff --git a/arch/frv/lib/__ucmpdi2.S b/arch/frv/lib/__ucmpdi2.S
new file mode 100644
index 000000000000..d892f16ffaa9
--- /dev/null
+++ b/arch/frv/lib/__ucmpdi2.S
@@ -0,0 +1,45 @@
+/* __ucmpdi2.S: 64-bit unsigned compare
+ *
+ * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+
+        .text
+        .p2align        4
+
+###############################################################################
+#
+# int __ucmpdi2(unsigned long long a [GR8:GR9],
+#               unsigned long long b [GR10:GR11])
+#
+# - returns 0, 1, or 2 as a <, =, > b respectively.
+#
+###############################################################################
+        .globl          __ucmpdi2
+        .type           __ucmpdi2,@function
+__ucmpdi2:
+        or.p            gr8,gr0,gr4
+        subcc           gr8,gr10,gr0,icc0
+        setlos.p        #0,gr8
+        bclr            icc0,#2                 ; a.msw < b.msw
+
+        setlos.p        #2,gr8
+        bhilr           icc0,#0                 ; a.msw > b.msw
+
+        subcc.p         gr9,gr11,gr0,icc1
+        setlos          #0,gr8
+        setlos.p        #2,gr9
+        setlos          #1,gr7
+        cknc            icc1,cc6
+        cor.p           gr9,gr0,gr8,            cc6,#1
+        cckls           icc1,cc4,               cc6,#1
+        andcr           cc6,cc4,cc4
+        cor             gr7,gr0,gr8,            cc4,#1
+        bralr
+        .size           __ucmpdi2, .-__ucmpdi2
diff --git a/arch/frv/lib/checksum.c b/arch/frv/lib/checksum.c
index 7bf5bd6cac8a..20e7dfc474ef 100644
--- a/arch/frv/lib/checksum.c
+++ b/arch/frv/lib/checksum.c
@@ -33,6 +33,7 @@
 
 #include <net/checksum.h>
 #include <asm/checksum.h>
+#include <linux/module.h>
 
 static inline unsigned short from32to16(unsigned long x)
 {
@@ -115,34 +116,52 @@ unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum)
         return result;
 }
 
+EXPORT_SYMBOL(csum_partial);
+
 /*
  * this routine is used for miscellaneous IP-like checksums, mainly
  * in icmp.c
  */
 unsigned short ip_compute_csum(const unsigned char * buff, int len)
 {
-        return ~do_csum(buff,len);
+        return ~do_csum(buff, len);
 }
 
+EXPORT_SYMBOL(ip_compute_csum);
+
 /*
  * copy from fs while checksumming, otherwise like csum_partial
  */
-
 unsigned int
-csum_partial_copy_from_user(const char *src, char *dst, int len, int sum, int *csum_err)
+csum_partial_copy_from_user(const char __user *src, char *dst,
+                            int len, int sum, int *csum_err)
 {
-        if (csum_err) *csum_err = 0;
-        memcpy(dst, src, len);
+        int rem;
+
+        if (csum_err)
+                *csum_err = 0;
+
+        rem = copy_from_user(dst, src, len);
+        if (rem != 0) {
+                if (csum_err)
+                        *csum_err = -EFAULT;
+                memset(dst + len - rem, 0, rem);
+                len = rem;
+        }
+
         return csum_partial(dst, len, sum);
 }
 
+EXPORT_SYMBOL(csum_partial_copy_from_user);
+
 /*
  * copy from ds while checksumming, otherwise like csum_partial
  */
-
 unsigned int
 csum_partial_copy(const char *src, char *dst, int len, int sum)
 {
         memcpy(dst, src, len);
         return csum_partial(dst, len, sum);
 }
+
+EXPORT_SYMBOL(csum_partial_copy);