Greg Ungerer | 6192c1e | 2009-07-02 16:11:58 +1000 | [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 | __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 | extern __wsum csum_partial_copy_from_user(const void __user *src, |
| 29 | void *dst, |
| 30 | int len, __wsum sum, |
| 31 | int *csum_err); |
| 32 | |
| 33 | extern __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 | |
| 49 | static 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 | |
Sam Ravnborg | 4914802 | 2009-01-16 21:58:10 +1000 | [diff] [blame] | 59 | #else |
Greg Ungerer | 6192c1e | 2009-07-02 16:11:58 +1000 | [diff] [blame] | 60 | |
| 61 | /* |
| 62 | * This is a version of ip_fast_csum() optimized for IP headers, |
| 63 | * which always checksum on 4 octet boundaries. |
| 64 | */ |
| 65 | static 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 | |
| 86 | static 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 | |
| 102 | static inline __wsum |
| 103 | csum_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 | */ |
| 122 | static inline __sum16 |
| 123 | csum_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 | |
| 134 | static 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 |
| 140 | static __inline__ __sum16 |
| 141 | csum_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 */ |