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authorMikael Starvik <mikael.starvik@axis.com>2005-07-27 11:44:44 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-07-27 16:26:01 -0700
commit51533b615e605d86154ec1b4e585c8ca1b0b15b7 (patch)
tree4a6d7d8494d2017632d83624fb71b36031e0e7e5 /include/asm-cris/arch-v32/checksum.h
parent5d01e6ce785884a5db5792cd2e5bb36fa82fe23c (diff)
[PATCH] CRIS update: new subarchitecture v32
New CRIS sub architecture named v32. From: Dave Jones <davej@redhat.com> Fix swapped kmalloc args Signed-off-by: Mikael Starvik <starvik@axis.com> Signed-off-by: Dave Jones <davej@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-cris/arch-v32/checksum.h')
-rw-r--r--include/asm-cris/arch-v32/checksum.h29
1 files changed, 29 insertions, 0 deletions
diff --git a/include/asm-cris/arch-v32/checksum.h b/include/asm-cris/arch-v32/checksum.h
new file mode 100644
index 00000000000..a1d6b2a6cc4
--- /dev/null
+++ b/include/asm-cris/arch-v32/checksum.h
@@ -0,0 +1,29 @@
+#ifndef _ASM_CRIS_ARCH_CHECKSUM_H
+#define _ASM_CRIS_ARCH_CHECKSUM_H
+
+/*
+ * Check values used in TCP/UDP headers.
+ *
+ * The gain of doing this in assembler instead of C, is that C doesn't
+ * generate carry-additions for the 32-bit components of the
+ * checksum. Which means it would be necessary to split all those into
+ * 16-bit components and then add.
+ */
+extern inline unsigned int
+csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr,
+ unsigned short len, unsigned short proto, unsigned int sum)
+{
+ int res;
+
+ __asm__ __volatile__ ("add.d %2, %0\n\t"
+ "addc %3, %0\n\t"
+ "addc %4, %0\n\t"
+ "addc 0, %0\n\t"
+ : "=r" (res)
+ : "0" (sum), "r" (daddr), "r" (saddr), \
+ "r" ((ntohs(len) << 16) + (proto << 8)));
+
+ return res;
+}
+
+#endif /* _ASM_CRIS_ARCH_CHECKSUM_H */