1 #ifndef _M68K_CHECKSUM_H 2 #define _M68K_CHECKSUM_H 3 4 #include <linux/in6.h> 5 6 #ifdef CONFIG_GENERIC_CSUM 7 #include <asm-generic/checksum.h> 8 #else 9 10 /* 11 * computes the checksum of a memory block at buff, length len, 12 * and adds in "sum" (32-bit) 13 * 14 * returns a 32-bit number suitable for feeding into itself 15 * or csum_tcpudp_magic 16 * 17 * this function must be called with even lengths, except 18 * for the last fragment, which may be odd 19 * 20 * it's best to have buff aligned on a 32-bit boundary 21 */ 22 __wsum csum_partial(const void *buff, int len, __wsum sum); 23 24 /* 25 * the same as csum_partial, but copies from src while it 26 * checksums 27 * 28 * here even more important to align src and dst on a 32-bit (or even 29 * better 64-bit) boundary 30 */ 31 32 extern __wsum csum_partial_copy_from_user(const void __user *src, 33 void *dst, 34 int len, __wsum sum, 35 int *csum_err); 36 37 extern __wsum csum_partial_copy_nocheck(const void *src, 38 void *dst, int len, 39 __wsum sum); 40 41 /* 42 * This is a version of ip_fast_csum() optimized for IP headers, 43 * which always checksum on 4 octet boundaries. 44 */ 45 static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) 46 { 47 unsigned int sum = 0; 48 unsigned long tmp; 49 50 __asm__ ("subqw #1,%2\n" 51 "1:\t" 52 "movel %1@+,%3\n\t" 53 "addxl %3,%0\n\t" 54 "dbra %2,1b\n\t" 55 "movel %0,%3\n\t" 56 "swap %3\n\t" 57 "addxw %3,%0\n\t" 58 "clrw %3\n\t" 59 "addxw %3,%0\n\t" 60 : "=d" (sum), "=&a" (iph), "=&d" (ihl), "=&d" (tmp) 61 : "0" (sum), "1" (iph), "2" (ihl) 62 : "memory"); 63 return (__force __sum16)~sum; 64 } 65 66 static inline __sum16 csum_fold(__wsum sum) 67 { 68 unsigned int tmp = (__force u32)sum; 69 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 77 return (__force __sum16)~sum; 78 } 79 80 static inline __wsum 81 csum_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 */ 100 static inline __sum16 101 csum_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 */ 111 112 static 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 118 static __inline__ __sum16 119 csum_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 /* CONFIG_GENERIC_CSUM */ 149 #endif /* _M68K_CHECKSUM_H */ 150