1#ifndef _M68K_CHECKSUM_H 2#define _M68K_CHECKSUM_H 3 4#include <linux/in6.h> 5 6/* 7 * computes the checksum of a memory block at buff, length len, 8 * and adds in "sum" (32-bit) 9 * 10 * returns a 32-bit number suitable for feeding into itself 11 * or csum_tcpudp_magic 12 * 13 * this function must be called with even lengths, except 14 * for the last fragment, which may be odd 15 * 16 * it's best to have buff aligned on a 32-bit boundary 17 */ 18__wsum csum_partial(const void *buff, int len, __wsum sum); 19 20/* 21 * the same as csum_partial, but copies from src while it 22 * checksums 23 * 24 * here even more important to align src and dst on a 32-bit (or even 25 * better 64-bit) boundary 26 */ 27 28__wsum csum_partial_copy_nocheck(const void *src, void *dst, 29 int len, __wsum sum); 30 31 32/* 33 * the same as csum_partial_copy, but copies from user space. 34 * 35 * here even more important to align src and dst on a 32-bit (or even 36 * better 64-bit) boundary 37 */ 38 39extern __wsum csum_partial_copy_from_user(const void __user *src, 40 void *dst, int len, __wsum sum, int *csum_err); 41 42__sum16 ip_fast_csum(const void *iph, unsigned int ihl); 43 44/* 45 * Fold a partial checksum 46 */ 47 48static inline __sum16 csum_fold(__wsum sum) 49{ 50 unsigned int tmp = (__force u32)sum; 51#ifdef CONFIG_COLDFIRE 52 tmp = (tmp & 0xffff) + (tmp >> 16); 53 tmp = (tmp & 0xffff) + (tmp >> 16); 54 return (__force __sum16)~tmp; 55#else 56 __asm__("swap %1\n\t" 57 "addw %1, %0\n\t" 58 "clrw %1\n\t" 59 "addxw %1, %0" 60 : "=&d" (sum), "=&d" (tmp) 61 : "0" (sum), "1" (sum)); 62 return (__force __sum16)~sum; 63#endif 64} 65 66 67/* 68 * computes the checksum of the TCP/UDP pseudo-header 69 * returns a 16-bit checksum, already complemented 70 */ 71 72static inline __wsum 73csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len, 74 unsigned short proto, __wsum sum) 75{ 76 __asm__ ("addl %1,%0\n\t" 77 "addxl %4,%0\n\t" 78 "addxl %5,%0\n\t" 79 "clrl %1\n\t" 80 "addxl %1,%0" 81 : "=&d" (sum), "=&d" (saddr) 82 : "0" (daddr), "1" (saddr), "d" (len + proto), 83 "d"(sum)); 84 return sum; 85} 86 87static inline __sum16 88csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len, 89 unsigned short proto, __wsum sum) 90{ 91 return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); 92} 93 94/* 95 * this routine is used for miscellaneous IP-like checksums, mainly 96 * in icmp.c 97 */ 98 99extern __sum16 ip_compute_csum(const void *buff, int len); 100 101#define _HAVE_ARCH_IPV6_CSUM 102static __inline__ __sum16 103csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr, 104 __u32 len, unsigned short proto, __wsum sum) 105{ 106 register unsigned long tmp; 107 __asm__("addl %2@,%0\n\t" 108 "movel %2@(4),%1\n\t" 109 "addxl %1,%0\n\t" 110 "movel %2@(8),%1\n\t" 111 "addxl %1,%0\n\t" 112 "movel %2@(12),%1\n\t" 113 "addxl %1,%0\n\t" 114 "movel %3@,%1\n\t" 115 "addxl %1,%0\n\t" 116 "movel %3@(4),%1\n\t" 117 "addxl %1,%0\n\t" 118 "movel %3@(8),%1\n\t" 119 "addxl %1,%0\n\t" 120 "movel %3@(12),%1\n\t" 121 "addxl %1,%0\n\t" 122 "addxl %4,%0\n\t" 123 "clrl %1\n\t" 124 "addxl %1,%0" 125 : "=&d" (sum), "=&d" (tmp) 126 : "a" (saddr), "a" (daddr), "d" (len + proto), 127 "0" (sum)); 128 129 return csum_fold(sum); 130} 131 132#endif /* _M68K_CHECKSUM_H */ 133