30 lines
744 B
C
30 lines
744 B
C
#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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static inline unsigned int
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csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned short len,
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unsigned short proto, unsigned int sum)
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{
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int res;
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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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: "0" (sum), "r" (daddr), "r" (saddr), "r" ((ntohs(len) << 16) + (proto << 8)));
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return res;
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}
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#endif
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