diff options
Diffstat (limited to 'include/asm-sparc64/checksum.h')
| -rw-r--r-- | include/asm-sparc64/checksum.h | 168 |
1 files changed, 1 insertions, 167 deletions
diff --git a/include/asm-sparc64/checksum.h b/include/asm-sparc64/checksum.h index b290564c8ce0..c3966c5e29d8 100644 --- a/include/asm-sparc64/checksum.h +++ b/include/asm-sparc64/checksum.h | |||
| @@ -1,167 +1 @@ | |||
| 1 | #ifndef __SPARC64_CHECKSUM_H | #include <asm-sparc/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) */ | ||
