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 28extern __wsum csum_partial_copy_from_user(const void __user *src, 29 void *dst, 30 int len, __wsum sum, 31 int *csum_err); 32 33extern __wsum csum_partial_copy_nocheck(const void *src, 34 void *dst, int len, 35 __wsum sum); 36 37/* 38 * This is a version of ip_compute_csum() optimized for IP headers, 39 * which always checksum on 4 octet boundaries. 40 * 41 */ 42static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) 43{ 44 unsigned int sum = 0; 45 unsigned long tmp; 46 47 __asm__ ("subqw #1,%2\n" 48 "1:\t" 49 "movel %1@+,%3\n\t" 50 "addxl %3,%0\n\t" 51 "dbra %2,1b\n\t" 52 "movel %0,%3\n\t" 53 "swap %3\n\t" 54 "addxw %3,%0\n\t" 55 "clrw %3\n\t" 56 "addxw %3,%0\n\t" 57 : "=d" (sum), "=&a" (iph), "=&d" (ihl), "=&d" (tmp) 58 : "0" (sum), "1" (iph), "2" (ihl) 59 : "memory"); 60 return (__force __sum16)~sum; 61} 62 63/* 64 * Fold a partial checksum 65 */ 66 67static inline __sum16 csum_fold(__wsum sum) 68{ 69 unsigned int tmp = (__force u32)sum; 70 __asm__("swap %1\n\t" 71 "addw %1, %0\n\t" 72 "clrw %1\n\t" 73 "addxw %1, %0" 74 : "=&d" (sum), "=&d" (tmp) 75 : "0" (sum), "1" (tmp)); 76 return (__force __sum16)~sum; 77} 78 79 80static inline __wsum 81csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len, 82 unsigned short proto, __wsum sum) 83{ 84 __asm__ ("addl %2,%0\n\t" 85 "addxl %3,%0\n\t" 86 "addxl %4,%0\n\t" 87 "clrl %1\n\t" 88 "addxl %1,%0" 89 : "=&d" (sum), "=d" (saddr) 90 : "g" (daddr), "1" (saddr), "d" (len + proto), 91 "0" (sum)); 92 return sum; 93} 94 95 96/* 97 * computes the checksum of the TCP/UDP pseudo-header 98 * returns a 16-bit checksum, already complemented 99 */ 100static inline __sum16 101csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len, 102 unsigned short proto, __wsum sum) 103{ 104 return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); 105} 106 107/* 108 * this routine is used for miscellaneous IP-like checksums, mainly 109 * in icmp.c 110 */ 111 112static inline __sum16 ip_compute_csum(const void *buff, int len) 113{ 114 return csum_fold (csum_partial(buff, len, 0)); 115} 116 117#define _HAVE_ARCH_IPV6_CSUM 118static __inline__ __sum16 119csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr, 120 __u32 len, unsigned short proto, __wsum sum) 121{ 122 register unsigned long tmp; 123 __asm__("addl %2@,%0\n\t" 124 "movel %2@(4),%1\n\t" 125 "addxl %1,%0\n\t" 126 "movel %2@(8),%1\n\t" 127 "addxl %1,%0\n\t" 128 "movel %2@(12),%1\n\t" 129 "addxl %1,%0\n\t" 130 "movel %3@,%1\n\t" 131 "addxl %1,%0\n\t" 132 "movel %3@(4),%1\n\t" 133 "addxl %1,%0\n\t" 134 "movel %3@(8),%1\n\t" 135 "addxl %1,%0\n\t" 136 "movel %3@(12),%1\n\t" 137 "addxl %1,%0\n\t" 138 "addxl %4,%0\n\t" 139 "clrl %1\n\t" 140 "addxl %1,%0" 141 : "=&d" (sum), "=&d" (tmp) 142 : "a" (saddr), "a" (daddr), "d" (len + proto), 143 "0" (sum)); 144 145 return csum_fold(sum); 146} 147 148#endif /* _M68K_CHECKSUM_H */ 149