git://bbs.cooldavid.org / net-next-2.6.git / blame
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1 | #ifndef __SPARC64_CHECKSUM_H |
| 2 | #define __SPARC64_CHECKSUM_H | |
| 3 | ||
| 4 | /* checksum.h: IP/UDP/TCP checksum routines on the V9. | |
| 5 | * | |
| 6 | * Copyright(C) 1995 Linus Torvalds | |
| 7 | * Copyright(C) 1995 Miguel de Icaza | |
| 8 | * Copyright(C) 1996 David S. Miller | |
| 9 | * Copyright(C) 1996 Eddie C. Dost | |
| 10 | * Copyright(C) 1997 Jakub Jelinek | |
| 11 | * | |
| 12 | * derived from: | |
| 13 | * Alpha checksum c-code | |
| 14 | * ix86 inline assembly | |
| 15 | * RFC1071 Computing the Internet Checksum | |
| 16 | */ | |
| 17 | ||
| 18 | #include <linux/in6.h> | |
| 19 | #include <asm/uaccess.h> | |
| 20 | ||
| 21 | /* computes the checksum of a memory block at buff, length len, | |
| 22 | * and adds in "sum" (32-bit) | |
| 23 | * | |
| 24 | * returns a 32-bit number suitable for feeding into itself | |
| 25 | * or csum_tcpudp_magic | |
| 26 | * | |
| 27 | * this function must be called with even lengths, except | |
| 28 | * for the last fragment, which may be odd | |
| 29 | * | |
| 30 | * it's best to have buff aligned on a 32-bit boundary | |
| 31 | */ | |
| 32 | extern __wsum csum_partial(const void * buff, int len, __wsum sum); | |
| 33 | ||
| 34 | /* the same as csum_partial, but copies from user space while it | |
| 35 | * checksums | |
| 36 | * | |
| 37 | * here even more important to align src and dst on a 32-bit (or even | |
| 38 | * better 64-bit) boundary | |
| 39 | */ | |
| 40 | extern __wsum csum_partial_copy_nocheck(const void *src, void *dst, | |
| 41 | int len, __wsum sum); | |
| 42 | ||
| 43 | extern long __csum_partial_copy_from_user(const void __user *src, | |
| 44 | void *dst, int len, | |
| 45 | __wsum sum); | |
| 46 | ||
| 47 | static inline __wsum | |
| 48 | csum_partial_copy_from_user(const void __user *src, | |
| 49 | void *dst, int len, | |
| 50 | __wsum sum, int *err) | |
| 51 | { | |
| 52 | long ret = __csum_partial_copy_from_user(src, dst, len, sum); | |
| 53 | if (ret < 0) | |
| 54 | *err = -EFAULT; | |
| 55 | return (__force __wsum) ret; | |
| 56 | } | |
| 57 | ||
| 58 | /* | |
| 59 | * Copy and checksum to user | |
| 60 | */ | |
| 61 | #define HAVE_CSUM_COPY_USER | |
| 62 | extern long __csum_partial_copy_to_user(const void *src, | |
| 63 | void __user *dst, int len, | |
| 64 | __wsum sum); | |
| 65 | ||
| 66 | static inline __wsum | |
| 67 | csum_and_copy_to_user(const void *src, | |
| 68 | void __user *dst, int len, | |
| 69 | __wsum sum, int *err) | |
| 70 | { | |
| 71 | long ret = __csum_partial_copy_to_user(src, dst, len, sum); | |
| 72 | if (ret < 0) | |
| 73 | *err = -EFAULT; | |
| 74 | return (__force __wsum) ret; | |
| 75 | } | |
| 76 | ||
| 77 | /* ihl is always 5 or greater, almost always is 5, and iph is word aligned | |
| 78 | * the majority of the time. | |
| 79 | */ | |
| 80 | extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl); | |
| 81 | ||
| 82 | /* Fold a partial checksum without adding pseudo headers. */ | |
| 83 | static inline __sum16 csum_fold(__wsum sum) | |
| 84 | { | |
| 85 | unsigned int tmp; | |
| 86 | ||
| 87 | __asm__ __volatile__( | |
| 88 | " addcc %0, %1, %1\n" | |
| 89 | " srl %1, 16, %1\n" | |
| 90 | " addc %1, %%g0, %1\n" | |
| 91 | " xnor %%g0, %1, %0\n" | |
| 92 | : "=&r" (sum), "=r" (tmp) | |
| 93 | : "0" (sum), "1" ((__force u32)sum<<16) | |
| 94 | : "cc"); | |
| 95 | return (__force __sum16)sum; | |
| 96 | } | |
| 97 | ||
| 98 | static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, | |
| 99 | unsigned int len, | |
| 100 | unsigned short proto, | |
| 101 | __wsum sum) | |
| 102 | { | |
| 103 | __asm__ __volatile__( | |
| 104 | " addcc %1, %0, %0\n" | |
| 105 | " addccc %2, %0, %0\n" | |
| 106 | " addccc %3, %0, %0\n" | |
| 107 | " addc %0, %%g0, %0\n" | |
| 108 | : "=r" (sum), "=r" (saddr) | |
| 109 | : "r" (daddr), "r" (proto + len), "0" (sum), "1" (saddr) | |
| 110 | : "cc"); | |
| 111 | return sum; | |
| 112 | } | |
| 113 | ||
| 114 | /* | |
| 115 | * computes the checksum of the TCP/UDP pseudo-header | |
| 116 | * returns a 16-bit checksum, already complemented | |
| 117 | */ | |
| 118 | static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, | |
| 119 | unsigned short len, | |
| 120 | unsigned short proto, | |
| 121 | __wsum sum) | |
| 122 | { | |
| 123 | return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); | |
| 124 | } | |
| 125 | ||
| 126 | #define _HAVE_ARCH_IPV6_CSUM | |
| 127 | ||
| 128 | static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr, | |
| 129 | const struct in6_addr *daddr, | |
| 130 | __u32 len, unsigned short proto, | |
| 131 | __wsum sum) | |
| 132 | { | |
| 133 | __asm__ __volatile__ ( | |
| 134 | " addcc %3, %4, %%g7\n" | |
| 135 | " addccc %5, %%g7, %%g7\n" | |
| 136 | " lduw [%2 + 0x0c], %%g2\n" | |
| 137 | " lduw [%2 + 0x08], %%g3\n" | |
| 138 | " addccc %%g2, %%g7, %%g7\n" | |
| 139 | " lduw [%2 + 0x04], %%g2\n" | |
| 140 | " addccc %%g3, %%g7, %%g7\n" | |
| 141 | " lduw [%2 + 0x00], %%g3\n" | |
| 142 | " addccc %%g2, %%g7, %%g7\n" | |
| 143 | " lduw [%1 + 0x0c], %%g2\n" | |
| 144 | " addccc %%g3, %%g7, %%g7\n" | |
| 145 | " lduw [%1 + 0x08], %%g3\n" | |
| 146 | " addccc %%g2, %%g7, %%g7\n" | |
| 147 | " lduw [%1 + 0x04], %%g2\n" | |
| 148 | " addccc %%g3, %%g7, %%g7\n" | |
| 149 | " lduw [%1 + 0x00], %%g3\n" | |
| 150 | " addccc %%g2, %%g7, %%g7\n" | |
| 151 | " addccc %%g3, %%g7, %0\n" | |
| 152 | " addc 0, %0, %0\n" | |
| 153 | : "=&r" (sum) | |
| 154 | : "r" (saddr), "r" (daddr), "r"(htonl(len)), | |
| 155 | "r"(htonl(proto)), "r"(sum) | |
| 156 | : "g2", "g3", "g7", "cc"); | |
| 157 | ||
| 158 | return csum_fold(sum); | |
| 159 | } | |
| 160 | ||
| 161 | /* this routine is used for miscellaneous IP-like checksums, mainly in icmp.c */ | |
| 162 | static inline __sum16 ip_compute_csum(const void *buff, int len) | |
| 163 | { | |
| 164 | return csum_fold(csum_partial(buff, len, 0)); | |
| 165 | } | |
| 166 | ||
| 167 | #endif /* !(__SPARC64_CHECKSUM_H) */ |