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| author | GuanXuetao <gxt@mprc.pku.edu.cn> | 2011-01-15 18:23:09 +0800 |
|---|---|---|
| committer | GuanXuetao <gxt@mprc.pku.edu.cn> | 2011-03-17 09:19:13 +0800 |
| commit | 96cf5185a95e0b304596fe19edcf8dfcd5c10699 (patch) | |
| tree | aebdf44fdfa8841577171df18cb1b0745b54d64e /arch/unicore32/include/asm/checksum.h | |
| parent | 77c93b2f2388b974253af4149aa025b4751f92ad (diff) | |
unicore32 additional architecture files: low-level lib: misc
This patch implements the rest low-level libraries.
Signed-off-by: Guan Xuetao <gxt@mprc.pku.edu.cn>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/unicore32/include/asm/checksum.h')
| -rw-r--r-- | arch/unicore32/include/asm/checksum.h | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/arch/unicore32/include/asm/checksum.h b/arch/unicore32/include/asm/checksum.h new file mode 100644 index 000000000000..f55c3f937c3e --- /dev/null +++ b/arch/unicore32/include/asm/checksum.h @@ -0,0 +1,41 @@ +/* + * linux/arch/unicore32/include/asm/checksum.h + * + * Code specific to PKUnity SoC and UniCore ISA + * + * Copyright (C) 2001-2010 GUAN Xue-tao + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * IP checksum routines + */ +#ifndef __UNICORE_CHECKSUM_H__ +#define __UNICORE_CHECKSUM_H__ + +/* + * 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__( + "add.a %0, %1, %2\n" + "addc.a %0, %0, %3\n" + "addc.a %0, %0, %4 << #8\n" + "addc.a %0, %0, %5\n" + "addc %0, %0, #0\n" + : "=&r"(sum) + : "r" (sum), "r" (daddr), "r" (saddr), "r" (len), "Ir" (htons(proto)) + : "cc"); + return sum; +} +#define csum_tcpudp_nofold csum_tcpudp_nofold + +#include <asm-generic/checksum.h> + +#endif |