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authorBryan Wu <cooloney@kernel.org>2008-08-27 10:51:02 +0800
committerBryan Wu <cooloney@kernel.org>2008-08-27 10:51:02 +0800
commit639f6571458948b5112be2cf00c0c2c04db2897d (patch)
treea4dd7af33d0e92c935ba1e904f6fb7e923ac825e /arch/blackfin/include/asm/checksum.h
parent3d9b7a5ce534f3963afcf8f4777267e5899fe007 (diff)
downloadlinux-639f6571458948b5112be2cf00c0c2c04db2897d.tar.gz
Blackfin arch: move include/asm-blackfin header files to arch/blackfin
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Diffstat (limited to 'arch/blackfin/include/asm/checksum.h')
-rw-r--r--arch/blackfin/include/asm/checksum.h100
1 files changed, 100 insertions, 0 deletions
diff --git a/arch/blackfin/include/asm/checksum.h b/arch/blackfin/include/asm/checksum.h
new file mode 100644
index 00000000000..6f6af2b8e9e
--- /dev/null
+++ b/arch/blackfin/include/asm/checksum.h
@@ -0,0 +1,100 @@
+#ifndef _BFIN_CHECKSUM_H
+#define _BFIN_CHECKSUM_H
+
+/*
+ * MODIFIED FOR BFIN April 30, 2001 akbar.hussain@lineo.com
+ *
+ * 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
+ */
+__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
+ */
+
+__wsum csum_partial_copy(const void *src, void *dst,
+ int len, __wsum sum);
+
+/*
+ * the same as csum_partial_copy, but copies from user space.
+ *
+ * here even more important to align src and dst on a 32-bit (or even
+ * better 64-bit) boundary
+ */
+
+extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
+ int len, __wsum sum, int *csum_err);
+
+#define csum_partial_copy_nocheck(src, dst, len, sum) \
+ csum_partial_copy((src), (dst), (len), (sum))
+
+__sum16 ip_fast_csum(unsigned char *iph, unsigned int ihl);
+
+/*
+ * Fold a partial checksum
+ */
+
+static inline __sum16 csum_fold(__wsum sum)
+{
+ while (sum >> 16)
+ sum = (sum & 0xffff) + (sum >> 16);
+ return ((~(sum << 16)) >> 16);
+}
+
+/*
+ * computes the checksum of the TCP/UDP pseudo-header
+ * returns a 16-bit checksum, already complemented
+ */
+
+static inline __wsum
+csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
+ unsigned short proto, __wsum sum)
+{
+
+ __asm__ ("%0 = %0 + %1;\n\t"
+ "CC = AC0;\n\t"
+ "if !CC jump 4;\n\t"
+ "%0 = %0 + %4;\n\t"
+ "%0 = %0 + %2;\n\t"
+ "CC = AC0;\n\t"
+ "if !CC jump 4;\n\t"
+ "%0 = %0 + %4;\n\t"
+ "%0 = %0 + %3;\n\t"
+ "CC = AC0;\n\t"
+ "if !CC jump 4;\n\t"
+ "%0 = %0 + %4;\n\t"
+ "NOP;\n\t"
+ : "=d" (sum)
+ : "d" (daddr), "d" (saddr), "d" ((ntohs(len)<<16)+proto*256), "d" (1), "0"(sum));
+
+ return (sum);
+}
+
+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
+ */
+
+extern __sum16 ip_compute_csum(const void *buff, int len);
+
+#endif /* _BFIN_CHECKSUM_H */