2005-04-17 06:20:36 +08:00
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#ifndef _CRIS_ARCH_CHECKSUM_H
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#define _CRIS_ARCH_CHECKSUM_H
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/* Checksum some values used in TCP/UDP headers.
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*
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* The gain by doing this in asm is that C will not generate carry-additions
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* for the 32-bit components of the checksum, so otherwise we would have had
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* to split all of those into 16-bit components, then add.
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*/
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2006-11-15 13:15:19 +08:00
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static inline __wsum
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csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
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unsigned short proto, __wsum sum)
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2005-04-17 06:20:36 +08:00
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{
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2006-11-15 13:15:19 +08:00
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__wsum res;
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2005-04-17 06:20:36 +08:00
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__asm__ ("add.d %2, %0\n\t"
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"ax\n\t"
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"add.d %3, %0\n\t"
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"ax\n\t"
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"add.d %4, %0\n\t"
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"ax\n\t"
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"addq 0, %0\n"
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: "=r" (res)
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2006-11-15 13:15:19 +08:00
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: "0" (sum), "r" (daddr), "r" (saddr), "r" ((len + proto) << 8));
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2005-04-17 06:20:36 +08:00
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return res;
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}
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#endif
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