1#ifndef _H8300_CHECKSUM_H 2#define _H8300_CHECKSUM_H 3 4/* 5 * computes the checksum of a memory block at buff, length len, 6 * and adds in "sum" (32-bit) 7 * 8 * returns a 32-bit number suitable for feeding into itself 9 * or csum_tcpudp_magic 10 * 11 * this function must be called with even lengths, except 12 * for the last fragment, which may be odd 13 * 14 * it's best to have buff aligned on a 32-bit boundary 15 */ 16__wsum csum_partial(const void *buff, int len, __wsum sum); 17 18/* 19 * the same as csum_partial, but copies from src while it 20 * checksums 21 * 22 * here even more important to align src and dst on a 32-bit (or even 23 * better 64-bit) boundary 24 */ 25 26__wsum csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum); 27 28 29/* 30 * the same as csum_partial_copy, but copies from user space. 31 * 32 * here even more important to align src and dst on a 32-bit (or even 33 * better 64-bit) boundary 34 */ 35 36extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst, 37 int len, __wsum sum, int *csum_err); 38 39__sum16 ip_fast_csum(const void *iph, unsigned int ihl); 40 41 42/* 43 * Fold a partial checksum 44 */ 45 46static inline __sum16 csum_fold(__wsum sum) 47{ 48 __asm__("mov.l %0,er0\n\t" 49 "add.w e0,r0\n\t" 50 "xor.w e0,e0\n\t" 51 "rotxl.w e0\n\t" 52 "add.w e0,r0\n\t" 53 "sub.w e0,e0\n\t" 54 "mov.l er0,%0" 55 : "=r"(sum) 56 : "0"(sum) 57 : "er0"); 58 return (__force __sum16)~sum; 59} 60 61 62/* 63 * computes the checksum of the TCP/UDP pseudo-header 64 * returns a 16-bit checksum, already complemented 65 */ 66 67static inline __wsum 68csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len, 69 unsigned short proto, __wsum sum) 70{ 71 __asm__ ("sub.l er0,er0\n\t" 72 "add.l %2,%0\n\t" 73 "addx #0,r0l\n\t" 74 "add.l %3,%0\n\t" 75 "addx #0,r0l\n\t" 76 "add.l %4,%0\n\t" 77 "addx #0,r0l\n\t" 78 "add.l er0,%0\n\t" 79 "bcc 1f\n\t" 80 "inc.l #1,%0\n" 81 "1:" 82 : "=&r" (sum) 83 : "0" (sum), "r" (daddr), "r" (saddr), "r" (len + proto) 84 :"er0"); 85 return sum; 86} 87 88static inline __sum16 89csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len, 90 unsigned short proto, __wsum sum) 91{ 92 return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); 93} 94 95/* 96 * this routine is used for miscellaneous IP-like checksums, mainly 97 * in icmp.c 98 */ 99 100extern __sum16 ip_compute_csum(const void *buff, int len); 101 102#endif /* _H8300_CHECKSUM_H */ 103