106 lines
2.5 KiB
C
106 lines
2.5 KiB
C
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#ifndef _H8300_CHECKSUM_H
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#define _H8300_CHECKSUM_H
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/*
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* computes the checksum of a memory block at buff, length len,
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* and adds in "sum" (32-bit)
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*
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* returns a 32-bit number suitable for feeding into itself
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* or csum_tcpudp_magic
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*
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* this function must be called with even lengths, except
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* for the last fragment, which may be odd
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*
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* it's best to have buff aligned on a 32-bit boundary
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*/
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unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum);
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/*
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* the same as csum_partial, but copies from src while it
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* checksums
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*
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* here even more important to align src and dst on a 32-bit (or even
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* better 64-bit) boundary
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*/
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unsigned int csum_partial_copy(const char *src, char *dst, int len, int sum);
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/*
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* the same as csum_partial_copy, but copies from user space.
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*
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* here even more important to align src and dst on a 32-bit (or even
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* better 64-bit) boundary
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*/
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extern unsigned int csum_partial_copy_from_user(const char *src, char *dst,
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int len, int sum, int *csum_err);
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#define csum_partial_copy_nocheck(src, dst, len, sum) \
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csum_partial_copy((src), (dst), (len), (sum))
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unsigned short ip_fast_csum(unsigned char *iph, unsigned int ihl);
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/*
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* Fold a partial checksum
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*/
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static inline unsigned int csum_fold(unsigned int sum)
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{
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__asm__("mov.l %0,er0\n\t"
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"add.w e0,r0\n\t"
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"xor.w e0,e0\n\t"
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"rotxl.w e0\n\t"
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"add.w e0,r0\n\t"
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"sub.w e0,e0\n\t"
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"mov.l er0,%0"
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: "=r"(sum)
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: "0"(sum)
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: "er0");
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return ~sum;
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}
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/*
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* computes the checksum of the TCP/UDP pseudo-header
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* returns a 16-bit checksum, already complemented
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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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__asm__ ("sub.l er0,er0\n\t"
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"add.l %2,%0\n\t"
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"addx #0,r0l\n\t"
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"add.l %3,%0\n\t"
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"addx #0,r0l\n\t"
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"add.l %4,%0\n\t"
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"addx #0,r0l\n\t"
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"add.l er0,%0\n\t"
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"bcc 1f\n\t"
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"inc.l #1,%0\n"
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"1:"
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: "=&r" (sum)
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: "0" (sum), "r" (daddr), "r" (saddr), "r" (len + proto)
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:"er0");
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return sum;
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}
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static inline unsigned short int
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csum_tcpudp_magic(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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return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
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}
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/*
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* this routine is used for miscellaneous IP-like checksums, mainly
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* in icmp.c
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*/
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extern unsigned short ip_compute_csum(const unsigned char * buff, int len);
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#endif /* _H8300_CHECKSUM_H */
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