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#ifdef CONFIG_COLDFIRE 39 40/* 41 * The ColdFire cores don't support all the 68k instructions used 42 * in the optimized checksum code below. So it reverts back to using 43 * more standard C coded checksums. The fast checksum code is 44 * significantly larger than the optimized version, so it is not 45 * inlined here. 46 */ 47__sum16 ip_fast_csum(const void *iph, unsigned int ihl); 48 49static inline __sum16 csum_fold(__wsum sum) 50{ 51 unsigned int tmp = (__force u32)sum; 52 53 tmp = (tmp & 0xffff) + (tmp >> 16); 54 tmp = (tmp & 0xffff) + (tmp >> 16); 55 56 return (__force __sum16)~tmp; 57} 58 59#else 60 61/* 62 * This is a version of ip_fast_csum() optimized for IP headers, 63 * which always checksum on 4 octet boundaries. 64 */ 65static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) 66{ 67 unsigned int sum = 0; 68 unsigned long tmp; 69 70 __asm__ ("subqw #1,%2\n" 71 "1:\t" 72 "movel %1@+,%3\n\t" 73 "addxl %3,%0\n\t" 74 "dbra %2,1b\n\t" 75 "movel %0,%3\n\t" 76 "swap %3\n\t" 77 "addxw %3,%0\n\t" 78 "clrw %3\n\t" 79 "addxw %3,%0\n\t" 80 : "=d" (sum), "=&a" (iph), "=&d" (ihl), "=&d" (tmp) 81 : "0" (sum), "1" (iph), "2" (ihl) 82 : "memory"); 83 return (__force __sum16)~sum; 84} 85 86static inline __sum16 csum_fold(__wsum sum) 87{ 88 unsigned int tmp = (__force u32)sum; 89 90 __asm__("swap %1\n\t" 91 "addw %1, %0\n\t" 92 "clrw %1\n\t" 93 "addxw %1, %0" 94 : "=&d" (sum), "=&d" (tmp) 95 : "0" (sum), "1" (tmp)); 96 97 return (__force __sum16)~sum; 98} 99 100#endif /* CONFIG_COLDFIRE */ 101 102static inline __wsum 103csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len, 104 unsigned short proto, __wsum sum) 105{ 106 __asm__ ("addl %2,%0\n\t" 107 "addxl %3,%0\n\t" 108 "addxl %4,%0\n\t" 109 "clrl %1\n\t" 110 "addxl %1,%0" 111 : "=&d" (sum), "=d" (saddr) 112 : "g" (daddr), "1" (saddr), "d" (len + proto), 113 "0" (sum)); 114 return sum; 115} 116 117 118/* 119 * computes the checksum of the TCP/UDP pseudo-header 120 * returns a 16-bit checksum, already complemented 121 */ 122static inline __sum16 123csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len, 124 unsigned short proto, __wsum sum) 125{ 126 return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); 127} 128 129/* 130 * this routine is used for miscellaneous IP-like checksums, mainly 131 * in icmp.c 132 */ 133 134static inline __sum16 ip_compute_csum(const void *buff, int len) 135{ 136 return csum_fold (csum_partial(buff, len, 0)); 137} 138 139#define _HAVE_ARCH_IPV6_CSUM 140static __inline__ __sum16 141csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr, 142 __u32 len, unsigned short proto, __wsum sum) 143{ 144 register unsigned long tmp; 145 __asm__("addl %2@,%0\n\t" 146 "movel %2@(4),%1\n\t" 147 "addxl %1,%0\n\t" 148 "movel %2@(8),%1\n\t" 149 "addxl %1,%0\n\t" 150 "movel %2@(12),%1\n\t" 151 "addxl %1,%0\n\t" 152 "movel %3@,%1\n\t" 153 "addxl %1,%0\n\t" 154 "movel %3@(4),%1\n\t" 155 "addxl %1,%0\n\t" 156 "movel %3@(8),%1\n\t" 157 "addxl %1,%0\n\t" 158 "movel %3@(12),%1\n\t" 159 "addxl %1,%0\n\t" 160 "addxl %4,%0\n\t" 161 "clrl %1\n\t" 162 "addxl %1,%0" 163 : "=&d" (sum), "=&d" (tmp) 164 : "a" (saddr), "a" (daddr), "d" (len + proto), 165 "0" (sum)); 166 167 return csum_fold(sum); 168} 169 170#endif /* _M68K_CHECKSUM_H */ 171