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- #ifndef _H8300_CHECKSUM_H
- #define _H8300_CHECKSUM_H
- /*
- * computes the checksum of a memory block at buff, length len,
- * and adds in "sum" (32-bit)
- *
- * returns a 32-bit number suitable for feeding into itself
- * or csum_tcpudp_magic
- *
- * this function must be called with even lengths, except
- * for the last fragment, which may be odd
- *
- * it's best to have buff aligned on a 32-bit boundary
- */
- __wsum csum_partial(const void *buff, int len, __wsum sum);
- /*
- * the same as csum_partial, but copies from src while it
- * checksums
- *
- * here even more important to align src and dst on a 32-bit (or even
- * better 64-bit) boundary
- */
- __wsum csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum);
- /*
- * the same as csum_partial_copy, but copies from user space.
- *
- * here even more important to align src and dst on a 32-bit (or even
- * better 64-bit) boundary
- */
- extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
- int len, __wsum sum, int *csum_err);
- __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
- /*
- * Fold a partial checksum
- */
- static inline __sum16 csum_fold(__wsum sum)
- {
- __asm__("mov.l %0,er0\n\t"
- "add.w e0,r0\n\t"
- "xor.w e0,e0\n\t"
- "rotxl.w e0\n\t"
- "add.w e0,r0\n\t"
- "sub.w e0,e0\n\t"
- "mov.l er0,%0"
- : "=r"(sum)
- : "0"(sum)
- : "er0");
- return (__force __sum16)~sum;
- }
- /*
- * 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__ ("sub.l er0,er0\n\t"
- "add.l %2,%0\n\t"
- "addx #0,r0l\n\t"
- "add.l %3,%0\n\t"
- "addx #0,r0l\n\t"
- "add.l %4,%0\n\t"
- "addx #0,r0l\n\t"
- "add.l er0,%0\n\t"
- "bcc 1f\n\t"
- "inc.l #1,%0\n"
- "1:"
- : "=&r" (sum)
- : "0" (sum), "r" (daddr), "r" (saddr), "r" (len + proto)
- :"er0");
- return sum;
- }
- static inline __sum16
- csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len,
- unsigned short proto, __wsum sum)
- {
- return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
- }
- /*
- * this routine is used for miscellaneous IP-like checksums, mainly
- * in icmp.c
- */
- extern __sum16 ip_compute_csum(const void *buff, int len);
- #endif /* _H8300_CHECKSUM_H */
|
