| #ifndef _BFIN_CHECKSUM_H |
| #define _BFIN_CHECKSUM_H |
| |
| /* |
| * MODIFIED FOR BFIN April 30, 2001 akbar.hussain@lineo.com |
| * |
| * 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(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); |
| |
| #define csum_partial_copy_nocheck(src, dst, len, sum) \ |
| csum_partial_copy((src), (dst), (len), (sum)) |
| |
| __sum16 ip_fast_csum(unsigned char *iph, unsigned int ihl); |
| |
| /* |
| * Fold a partial checksum |
| */ |
| |
| static inline __sum16 csum_fold(__wsum sum) |
| { |
| while (sum >> 16) |
| sum = (sum & 0xffff) + (sum >> 16); |
| return ((~(sum << 16)) >> 16); |
| } |
| |
| /* |
| * 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__ ("%0 = %0 + %1;\n\t" |
| "CC = AC0;\n\t" |
| "if !CC jump 4;\n\t" |
| "%0 = %0 + %4;\n\t" |
| "%0 = %0 + %2;\n\t" |
| "CC = AC0;\n\t" |
| "if !CC jump 4;\n\t" |
| "%0 = %0 + %4;\n\t" |
| "%0 = %0 + %3;\n\t" |
| "CC = AC0;\n\t" |
| "if !CC jump 4;\n\t" |
| "%0 = %0 + %4;\n\t" |
| "NOP;\n\t" |
| : "=d" (sum) |
| : "d" (daddr), "d" (saddr), "d" ((ntohs(len)<<16)+proto*256), "d" (1), "0"(sum) |
| : "CC"); |
| |
| 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 /* _BFIN_CHECKSUM_H */ |