| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | unsigned int csum_partial(const unsigned char * buff, int len, unsigned int 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 | |
| Al Viro | 6225d85 | 2006-01-12 01:06:28 -0800 | [diff] [blame] | 28 | extern unsigned int csum_partial_copy_from_user(const unsigned char __user *src, |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | unsigned char *dst, |
| 30 | int len, int sum, |
| 31 | int *csum_err); |
| 32 | |
| 33 | extern unsigned int csum_partial_copy_nocheck(const unsigned char *src, |
| 34 | unsigned char *dst, int len, |
| 35 | int 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 | */ |
| 42 | static inline unsigned short |
| 43 | ip_fast_csum(unsigned char *iph, unsigned int ihl) |
| 44 | { |
| 45 | unsigned int sum = 0; |
| 46 | unsigned long tmp; |
| 47 | |
| 48 | __asm__ ("subqw #1,%2\n" |
| 49 | "1:\t" |
| 50 | "movel %1@+,%3\n\t" |
| 51 | "addxl %3,%0\n\t" |
| 52 | "dbra %2,1b\n\t" |
| 53 | "movel %0,%3\n\t" |
| 54 | "swap %3\n\t" |
| 55 | "addxw %3,%0\n\t" |
| 56 | "clrw %3\n\t" |
| 57 | "addxw %3,%0\n\t" |
| 58 | : "=d" (sum), "=&a" (iph), "=&d" (ihl), "=&d" (tmp) |
| 59 | : "0" (sum), "1" (iph), "2" (ihl) |
| 60 | : "memory"); |
| 61 | return ~sum; |
| 62 | } |
| 63 | |
| 64 | /* |
| 65 | * Fold a partial checksum |
| 66 | */ |
| 67 | |
| 68 | static inline unsigned int csum_fold(unsigned int sum) |
| 69 | { |
| 70 | unsigned int tmp = sum; |
| 71 | __asm__("swap %1\n\t" |
| 72 | "addw %1, %0\n\t" |
| 73 | "clrw %1\n\t" |
| 74 | "addxw %1, %0" |
| 75 | : "=&d" (sum), "=&d" (tmp) |
| 76 | : "0" (sum), "1" (tmp)); |
| 77 | return ~sum; |
| 78 | } |
| 79 | |
| 80 | |
| 81 | static inline unsigned int |
| 82 | csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned short len, |
| 83 | unsigned short proto, unsigned int sum) |
| 84 | { |
| 85 | __asm__ ("addl %2,%0\n\t" |
| 86 | "addxl %3,%0\n\t" |
| 87 | "addxl %4,%0\n\t" |
| 88 | "clrl %1\n\t" |
| 89 | "addxl %1,%0" |
| 90 | : "=&d" (sum), "=d" (saddr) |
| 91 | : "g" (daddr), "1" (saddr), "d" (len + proto), |
| 92 | "0" (sum)); |
| 93 | return sum; |
| 94 | } |
| 95 | |
| 96 | |
| 97 | /* |
| 98 | * computes the checksum of the TCP/UDP pseudo-header |
| 99 | * returns a 16-bit checksum, already complemented |
| 100 | */ |
| 101 | static inline unsigned short int |
| 102 | csum_tcpudp_magic(unsigned long saddr, unsigned long daddr, unsigned short len, |
| 103 | unsigned short proto, unsigned int sum) |
| 104 | { |
| 105 | return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); |
| 106 | } |
| 107 | |
| 108 | /* |
| 109 | * this routine is used for miscellaneous IP-like checksums, mainly |
| 110 | * in icmp.c |
| 111 | */ |
| 112 | |
| 113 | static inline unsigned short |
| 114 | ip_compute_csum(unsigned char * buff, int len) |
| 115 | { |
| 116 | return csum_fold (csum_partial(buff, len, 0)); |
| 117 | } |
| 118 | |
| 119 | #define _HAVE_ARCH_IPV6_CSUM |
| 120 | static __inline__ unsigned short int |
| 121 | csum_ipv6_magic(struct in6_addr *saddr, struct in6_addr *daddr, |
| 122 | __u32 len, unsigned short proto, unsigned int sum) |
| 123 | { |
| 124 | register unsigned long tmp; |
| 125 | __asm__("addl %2@,%0\n\t" |
| 126 | "movel %2@(4),%1\n\t" |
| 127 | "addxl %1,%0\n\t" |
| 128 | "movel %2@(8),%1\n\t" |
| 129 | "addxl %1,%0\n\t" |
| 130 | "movel %2@(12),%1\n\t" |
| 131 | "addxl %1,%0\n\t" |
| 132 | "movel %3@,%1\n\t" |
| 133 | "addxl %1,%0\n\t" |
| 134 | "movel %3@(4),%1\n\t" |
| 135 | "addxl %1,%0\n\t" |
| 136 | "movel %3@(8),%1\n\t" |
| 137 | "addxl %1,%0\n\t" |
| 138 | "movel %3@(12),%1\n\t" |
| 139 | "addxl %1,%0\n\t" |
| 140 | "addxl %4,%0\n\t" |
| 141 | "clrl %1\n\t" |
| 142 | "addxl %1,%0" |
| 143 | : "=&d" (sum), "=&d" (tmp) |
| 144 | : "a" (saddr), "a" (daddr), "d" (len + proto), |
| 145 | "0" (sum)); |
| 146 | |
| 147 | return csum_fold(sum); |
| 148 | } |
| 149 | |
| 150 | #endif /* _M68K_CHECKSUM_H */ |