Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef __SPARC_CHECKSUM_H |
| 2 | #define __SPARC_CHECKSUM_H |
| 3 | |
| 4 | /* checksum.h: IP/UDP/TCP checksum routines on the Sparc. |
| 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 | */ |
Al Viro | 16ec7e1 | 2006-11-14 21:22:56 -0800 | [diff] [blame] | 32 | extern __wsum csum_partial(const void *buff, int len, __wsum sum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
| 34 | /* the same as csum_partial, but copies from fs:src 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 | |
| 41 | extern unsigned int __csum_partial_copy_sparc_generic (const unsigned char *, unsigned char *); |
| 42 | |
Al Viro | 16ec7e1 | 2006-11-14 21:22:56 -0800 | [diff] [blame] | 43 | static inline __wsum |
| 44 | csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | { |
| 46 | register unsigned int ret asm("o0") = (unsigned int)src; |
| 47 | register char *d asm("o1") = dst; |
| 48 | register int l asm("g1") = len; |
| 49 | |
| 50 | __asm__ __volatile__ ( |
| 51 | "call __csum_partial_copy_sparc_generic\n\t" |
| 52 | " mov %6, %%g7\n" |
| 53 | : "=&r" (ret), "=&r" (d), "=&r" (l) |
| 54 | : "0" (ret), "1" (d), "2" (l), "r" (sum) |
| 55 | : "o2", "o3", "o4", "o5", "o7", |
| 56 | "g2", "g3", "g4", "g5", "g7", |
| 57 | "memory", "cc"); |
Al Viro | 16ec7e1 | 2006-11-14 21:22:56 -0800 | [diff] [blame] | 58 | return (__force __wsum)ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | } |
| 60 | |
Al Viro | 16ec7e1 | 2006-11-14 21:22:56 -0800 | [diff] [blame] | 61 | static inline __wsum |
| 62 | csum_partial_copy_from_user(const void __user *src, void *dst, int len, |
| 63 | __wsum sum, int *err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | { |
Al Viro | 16ec7e1 | 2006-11-14 21:22:56 -0800 | [diff] [blame] | 65 | register unsigned long ret asm("o0") = (unsigned long)src; |
| 66 | register char *d asm("o1") = dst; |
| 67 | register int l asm("g1") = len; |
| 68 | register __wsum s asm("g7") = sum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | |
Al Viro | 16ec7e1 | 2006-11-14 21:22:56 -0800 | [diff] [blame] | 70 | __asm__ __volatile__ ( |
| 71 | ".section __ex_table,#alloc\n\t" |
| 72 | ".align 4\n\t" |
| 73 | ".word 1f,2\n\t" |
| 74 | ".previous\n" |
| 75 | "1:\n\t" |
| 76 | "call __csum_partial_copy_sparc_generic\n\t" |
| 77 | " st %8, [%%sp + 64]\n" |
| 78 | : "=&r" (ret), "=&r" (d), "=&r" (l), "=&r" (s) |
| 79 | : "0" (ret), "1" (d), "2" (l), "3" (s), "r" (err) |
| 80 | : "o2", "o3", "o4", "o5", "o7", "g2", "g3", "g4", "g5", |
| 81 | "cc", "memory"); |
| 82 | return (__force __wsum)ret; |
| 83 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | |
Al Viro | 16ec7e1 | 2006-11-14 21:22:56 -0800 | [diff] [blame] | 85 | static inline __wsum |
| 86 | csum_partial_copy_to_user(const void *src, void __user *dst, int len, |
| 87 | __wsum sum, int *err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | { |
| 89 | if (!access_ok (VERIFY_WRITE, dst, len)) { |
| 90 | *err = -EFAULT; |
| 91 | return sum; |
| 92 | } else { |
| 93 | register unsigned long ret asm("o0") = (unsigned long)src; |
| 94 | register char __user *d asm("o1") = dst; |
| 95 | register int l asm("g1") = len; |
Al Viro | 16ec7e1 | 2006-11-14 21:22:56 -0800 | [diff] [blame] | 96 | register __wsum s asm("g7") = sum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
| 98 | __asm__ __volatile__ ( |
| 99 | ".section __ex_table,#alloc\n\t" |
| 100 | ".align 4\n\t" |
| 101 | ".word 1f,1\n\t" |
| 102 | ".previous\n" |
| 103 | "1:\n\t" |
| 104 | "call __csum_partial_copy_sparc_generic\n\t" |
| 105 | " st %8, [%%sp + 64]\n" |
| 106 | : "=&r" (ret), "=&r" (d), "=&r" (l), "=&r" (s) |
| 107 | : "0" (ret), "1" (d), "2" (l), "3" (s), "r" (err) |
| 108 | : "o2", "o3", "o4", "o5", "o7", |
| 109 | "g2", "g3", "g4", "g5", |
| 110 | "cc", "memory"); |
Al Viro | 16ec7e1 | 2006-11-14 21:22:56 -0800 | [diff] [blame] | 111 | return (__force __wsum)ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | } |
| 113 | } |
| 114 | |
| 115 | #define HAVE_CSUM_COPY_USER |
| 116 | #define csum_and_copy_to_user csum_partial_copy_to_user |
| 117 | |
| 118 | /* ihl is always 5 or greater, almost always is 5, and iph is word aligned |
| 119 | * the majority of the time. |
| 120 | */ |
Al Viro | 16ec7e1 | 2006-11-14 21:22:56 -0800 | [diff] [blame] | 121 | static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | { |
Al Viro | 16ec7e1 | 2006-11-14 21:22:56 -0800 | [diff] [blame] | 123 | __sum16 sum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | |
| 125 | /* Note: We must read %2 before we touch %0 for the first time, |
| 126 | * because GCC can legitimately use the same register for |
| 127 | * both operands. |
| 128 | */ |
| 129 | __asm__ __volatile__("sub\t%2, 4, %%g4\n\t" |
| 130 | "ld\t[%1 + 0x00], %0\n\t" |
| 131 | "ld\t[%1 + 0x04], %%g2\n\t" |
| 132 | "ld\t[%1 + 0x08], %%g3\n\t" |
| 133 | "addcc\t%%g2, %0, %0\n\t" |
| 134 | "addxcc\t%%g3, %0, %0\n\t" |
| 135 | "ld\t[%1 + 0x0c], %%g2\n\t" |
| 136 | "ld\t[%1 + 0x10], %%g3\n\t" |
| 137 | "addxcc\t%%g2, %0, %0\n\t" |
| 138 | "addx\t%0, %%g0, %0\n" |
| 139 | "1:\taddcc\t%%g3, %0, %0\n\t" |
| 140 | "add\t%1, 4, %1\n\t" |
| 141 | "addxcc\t%0, %%g0, %0\n\t" |
| 142 | "subcc\t%%g4, 1, %%g4\n\t" |
| 143 | "be,a\t2f\n\t" |
| 144 | "sll\t%0, 16, %%g2\n\t" |
| 145 | "b\t1b\n\t" |
| 146 | "ld\t[%1 + 0x10], %%g3\n" |
| 147 | "2:\taddcc\t%0, %%g2, %%g2\n\t" |
| 148 | "srl\t%%g2, 16, %0\n\t" |
| 149 | "addx\t%0, %%g0, %0\n\t" |
| 150 | "xnor\t%%g0, %0, %0" |
| 151 | : "=r" (sum), "=&r" (iph) |
| 152 | : "r" (ihl), "1" (iph) |
Bob Breuer | 51bcf09 | 2007-02-01 20:24:35 -0800 | [diff] [blame] | 153 | : "g2", "g3", "g4", "cc", "memory"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | return sum; |
| 155 | } |
| 156 | |
| 157 | /* Fold a partial checksum without adding pseudo headers. */ |
Al Viro | 16ec7e1 | 2006-11-14 21:22:56 -0800 | [diff] [blame] | 158 | static inline __sum16 csum_fold(__wsum sum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | { |
| 160 | unsigned int tmp; |
| 161 | |
| 162 | __asm__ __volatile__("addcc\t%0, %1, %1\n\t" |
| 163 | "srl\t%1, 16, %1\n\t" |
| 164 | "addx\t%1, %%g0, %1\n\t" |
| 165 | "xnor\t%%g0, %1, %0" |
| 166 | : "=&r" (sum), "=r" (tmp) |
Al Viro | 16ec7e1 | 2006-11-14 21:22:56 -0800 | [diff] [blame] | 167 | : "0" (sum), "1" ((__force u32)sum<<16) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | : "cc"); |
Al Viro | 16ec7e1 | 2006-11-14 21:22:56 -0800 | [diff] [blame] | 169 | return (__force __sum16)sum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | } |
| 171 | |
Al Viro | 16ec7e1 | 2006-11-14 21:22:56 -0800 | [diff] [blame] | 172 | static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, |
| 173 | unsigned short len, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | unsigned short proto, |
Al Viro | 16ec7e1 | 2006-11-14 21:22:56 -0800 | [diff] [blame] | 175 | __wsum sum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | { |
| 177 | __asm__ __volatile__("addcc\t%1, %0, %0\n\t" |
| 178 | "addxcc\t%2, %0, %0\n\t" |
| 179 | "addxcc\t%3, %0, %0\n\t" |
| 180 | "addx\t%0, %%g0, %0\n\t" |
| 181 | : "=r" (sum), "=r" (saddr) |
Al Viro | 16ec7e1 | 2006-11-14 21:22:56 -0800 | [diff] [blame] | 182 | : "r" (daddr), "r" (proto + len), "0" (sum), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | "1" (saddr) |
| 184 | : "cc"); |
| 185 | return sum; |
| 186 | } |
| 187 | |
| 188 | /* |
| 189 | * computes the checksum of the TCP/UDP pseudo-header |
| 190 | * returns a 16-bit checksum, already complemented |
| 191 | */ |
Al Viro | 16ec7e1 | 2006-11-14 21:22:56 -0800 | [diff] [blame] | 192 | static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | unsigned short len, |
| 194 | unsigned short proto, |
Al Viro | 16ec7e1 | 2006-11-14 21:22:56 -0800 | [diff] [blame] | 195 | __wsum sum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | { |
| 197 | return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); |
| 198 | } |
| 199 | |
| 200 | #define _HAVE_ARCH_IPV6_CSUM |
| 201 | |
Al Viro | 16ec7e1 | 2006-11-14 21:22:56 -0800 | [diff] [blame] | 202 | static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr, |
| 203 | const struct in6_addr *daddr, |
| 204 | __u32 len, unsigned short proto, |
| 205 | __wsum sum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | { |
| 207 | __asm__ __volatile__ ( |
| 208 | "addcc %3, %4, %%g4\n\t" |
| 209 | "addxcc %5, %%g4, %%g4\n\t" |
| 210 | "ld [%2 + 0x0c], %%g2\n\t" |
| 211 | "ld [%2 + 0x08], %%g3\n\t" |
| 212 | "addxcc %%g2, %%g4, %%g4\n\t" |
| 213 | "ld [%2 + 0x04], %%g2\n\t" |
| 214 | "addxcc %%g3, %%g4, %%g4\n\t" |
| 215 | "ld [%2 + 0x00], %%g3\n\t" |
| 216 | "addxcc %%g2, %%g4, %%g4\n\t" |
| 217 | "ld [%1 + 0x0c], %%g2\n\t" |
| 218 | "addxcc %%g3, %%g4, %%g4\n\t" |
| 219 | "ld [%1 + 0x08], %%g3\n\t" |
| 220 | "addxcc %%g2, %%g4, %%g4\n\t" |
| 221 | "ld [%1 + 0x04], %%g2\n\t" |
| 222 | "addxcc %%g3, %%g4, %%g4\n\t" |
| 223 | "ld [%1 + 0x00], %%g3\n\t" |
| 224 | "addxcc %%g2, %%g4, %%g4\n\t" |
| 225 | "addxcc %%g3, %%g4, %0\n\t" |
| 226 | "addx 0, %0, %0\n" |
| 227 | : "=&r" (sum) |
| 228 | : "r" (saddr), "r" (daddr), |
| 229 | "r"(htonl(len)), "r"(htonl(proto)), "r"(sum) |
| 230 | : "g2", "g3", "g4", "cc"); |
| 231 | |
| 232 | return csum_fold(sum); |
| 233 | } |
| 234 | |
| 235 | /* this routine is used for miscellaneous IP-like checksums, mainly in icmp.c */ |
Al Viro | 16ec7e1 | 2006-11-14 21:22:56 -0800 | [diff] [blame] | 236 | static inline __sum16 ip_compute_csum(const void *buff, int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | { |
| 238 | return csum_fold(csum_partial(buff, len, 0)); |
| 239 | } |
| 240 | |
| 241 | #endif /* !(__SPARC_CHECKSUM_H) */ |