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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 | #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 */ unsigned int csum_partial(const unsigned char * buff, int len, unsigned int 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 */ unsigned int csum_partial_copy(const char *src, char *dst, int len, int 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 unsigned int csum_partial_copy_from_user(const char *src, char *dst, int len, int sum, int *csum_err); #define csum_partial_copy_nocheck(src, dst, len, sum) \ csum_partial_copy((src), (dst), (len), (sum)) unsigned short ip_fast_csum(unsigned char *iph, unsigned int ihl); /* * Fold a partial checksum */ static inline unsigned int csum_fold(unsigned int 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 ~sum; } /* * computes the checksum of the TCP/UDP pseudo-header * returns a 16-bit checksum, already complemented */ static inline unsigned int csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned short len, unsigned short proto, unsigned int 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 unsigned short int csum_tcpudp_magic(unsigned long saddr, unsigned long daddr, unsigned short len, unsigned short proto, unsigned int 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 unsigned short ip_compute_csum(const unsigned char * buff, int len); #endif /* _H8300_CHECKSUM_H */ |