1/* $Id: checksum.h,v 1.1.1.1 2007/08/03 18:53:36 Exp $ */ 2#ifndef __SPARC_CHECKSUM_H 3#define __SPARC_CHECKSUM_H 4 5/* checksum.h: IP/UDP/TCP checksum routines on the Sparc. 6 * 7 * Copyright(C) 1995 Linus Torvalds 8 * Copyright(C) 1995 Miguel de Icaza 9 * Copyright(C) 1996 David S. Miller 10 * Copyright(C) 1996 Eddie C. Dost 11 * Copyright(C) 1997 Jakub Jelinek 12 * 13 * derived from: 14 * Alpha checksum c-code 15 * ix86 inline assembly 16 * RFC1071 Computing the Internet Checksum 17 */ 18 19#include <linux/in6.h> 20#include <asm/uaccess.h> 21 22/* computes the checksum of a memory block at buff, length len, 23 * and adds in "sum" (32-bit) 24 * 25 * returns a 32-bit number suitable for feeding into itself 26 * or csum_tcpudp_magic 27 * 28 * this function must be called with even lengths, except 29 * for the last fragment, which may be odd 30 * 31 * it's best to have buff aligned on a 32-bit boundary 32 */ 33extern __wsum csum_partial(const void *buff, int len, __wsum sum); 34 35/* the same as csum_partial, but copies from fs:src while it 36 * checksums 37 * 38 * here even more important to align src and dst on a 32-bit (or even 39 * better 64-bit) boundary 40 */ 41 42extern unsigned int __csum_partial_copy_sparc_generic (const unsigned char *, unsigned char *); 43 44static inline __wsum 45csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum) 46{ 47 register unsigned int ret asm("o0") = (unsigned int)src; 48 register char *d asm("o1") = dst; 49 register int l asm("g1") = len; 50 51 __asm__ __volatile__ ( 52 "call __csum_partial_copy_sparc_generic\n\t" 53 " mov %6, %%g7\n" 54 : "=&r" (ret), "=&r" (d), "=&r" (l) 55 : "0" (ret), "1" (d), "2" (l), "r" (sum) 56 : "o2", "o3", "o4", "o5", "o7", 57 "g2", "g3", "g4", "g5", "g7", 58 "memory", "cc"); 59 return (__force __wsum)ret; 60} 61 62static inline __wsum 63csum_partial_copy_from_user(const void __user *src, void *dst, int len, 64 __wsum sum, int *err) 65 { 66 register unsigned long ret asm("o0") = (unsigned long)src; 67 register char *d asm("o1") = dst; 68 register int l asm("g1") = len; 69 register __wsum s asm("g7") = sum; 70 71 __asm__ __volatile__ ( 72 ".section __ex_table,#alloc\n\t" 73 ".align 4\n\t" 74 ".word 1f,2\n\t" 75 ".previous\n" 76 "1:\n\t" 77 "call __csum_partial_copy_sparc_generic\n\t" 78 " st %8, [%%sp + 64]\n" 79 : "=&r" (ret), "=&r" (d), "=&r" (l), "=&r" (s) 80 : "0" (ret), "1" (d), "2" (l), "3" (s), "r" (err) 81 : "o2", "o3", "o4", "o5", "o7", "g2", "g3", "g4", "g5", 82 "cc", "memory"); 83 return (__force __wsum)ret; 84} 85 86static inline __wsum 87csum_partial_copy_to_user(const void *src, void __user *dst, int len, 88 __wsum sum, int *err) 89{ 90 if (!access_ok (VERIFY_WRITE, dst, len)) { 91 *err = -EFAULT; 92 return sum; 93 } else { 94 register unsigned long ret asm("o0") = (unsigned long)src; 95 register char __user *d asm("o1") = dst; 96 register int l asm("g1") = len; 97 register __wsum s asm("g7") = sum; 98 99 __asm__ __volatile__ ( 100 ".section __ex_table,#alloc\n\t" 101 ".align 4\n\t" 102 ".word 1f,1\n\t" 103 ".previous\n" 104 "1:\n\t" 105 "call __csum_partial_copy_sparc_generic\n\t" 106 " st %8, [%%sp + 64]\n" 107 : "=&r" (ret), "=&r" (d), "=&r" (l), "=&r" (s) 108 : "0" (ret), "1" (d), "2" (l), "3" (s), "r" (err) 109 : "o2", "o3", "o4", "o5", "o7", 110 "g2", "g3", "g4", "g5", 111 "cc", "memory"); 112 return (__force __wsum)ret; 113 } 114} 115 116#define HAVE_CSUM_COPY_USER 117#define csum_and_copy_to_user csum_partial_copy_to_user 118 119/* ihl is always 5 or greater, almost always is 5, and iph is word aligned 120 * the majority of the time. 121 */ 122static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) 123{ 124 __sum16 sum; 125 126 /* Note: We must read %2 before we touch %0 for the first time, 127 * because GCC can legitimately use the same register for 128 * both operands. 129 */ 130 __asm__ __volatile__("sub\t%2, 4, %%g4\n\t" 131 "ld\t[%1 + 0x00], %0\n\t" 132 "ld\t[%1 + 0x04], %%g2\n\t" 133 "ld\t[%1 + 0x08], %%g3\n\t" 134 "addcc\t%%g2, %0, %0\n\t" 135 "addxcc\t%%g3, %0, %0\n\t" 136 "ld\t[%1 + 0x0c], %%g2\n\t" 137 "ld\t[%1 + 0x10], %%g3\n\t" 138 "addxcc\t%%g2, %0, %0\n\t" 139 "addx\t%0, %%g0, %0\n" 140 "1:\taddcc\t%%g3, %0, %0\n\t" 141 "add\t%1, 4, %1\n\t" 142 "addxcc\t%0, %%g0, %0\n\t" 143 "subcc\t%%g4, 1, %%g4\n\t" 144 "be,a\t2f\n\t" 145 "sll\t%0, 16, %%g2\n\t" 146 "b\t1b\n\t" 147 "ld\t[%1 + 0x10], %%g3\n" 148 "2:\taddcc\t%0, %%g2, %%g2\n\t" 149 "srl\t%%g2, 16, %0\n\t" 150 "addx\t%0, %%g0, %0\n\t" 151 "xnor\t%%g0, %0, %0" 152 : "=r" (sum), "=&r" (iph) 153 : "r" (ihl), "1" (iph) 154 : "g2", "g3", "g4", "cc", "memory"); 155 return sum; 156} 157 158/* Fold a partial checksum without adding pseudo headers. */ 159static inline __sum16 csum_fold(__wsum sum) 160{ 161 unsigned int tmp; 162 163 __asm__ __volatile__("addcc\t%0, %1, %1\n\t" 164 "srl\t%1, 16, %1\n\t" 165 "addx\t%1, %%g0, %1\n\t" 166 "xnor\t%%g0, %1, %0" 167 : "=&r" (sum), "=r" (tmp) 168 : "0" (sum), "1" ((__force u32)sum<<16) 169 : "cc"); 170 return (__force __sum16)sum; 171} 172 173static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, 174 unsigned short len, 175 unsigned short proto, 176 __wsum sum) 177{ 178 __asm__ __volatile__("addcc\t%1, %0, %0\n\t" 179 "addxcc\t%2, %0, %0\n\t" 180 "addxcc\t%3, %0, %0\n\t" 181 "addx\t%0, %%g0, %0\n\t" 182 : "=r" (sum), "=r" (saddr) 183 : "r" (daddr), "r" (proto + len), "0" (sum), 184 "1" (saddr) 185 : "cc"); 186 return sum; 187} 188 189/* 190 * computes the checksum of the TCP/UDP pseudo-header 191 * returns a 16-bit checksum, already complemented 192 */ 193static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, 194 unsigned short len, 195 unsigned short proto, 196 __wsum sum) 197{ 198 return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); 199} 200 201#define _HAVE_ARCH_IPV6_CSUM 202 203static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr, 204 const struct in6_addr *daddr, 205 __u32 len, unsigned short proto, 206 __wsum sum) 207{ 208 __asm__ __volatile__ ( 209 "addcc %3, %4, %%g4\n\t" 210 "addxcc %5, %%g4, %%g4\n\t" 211 "ld [%2 + 0x0c], %%g2\n\t" 212 "ld [%2 + 0x08], %%g3\n\t" 213 "addxcc %%g2, %%g4, %%g4\n\t" 214 "ld [%2 + 0x04], %%g2\n\t" 215 "addxcc %%g3, %%g4, %%g4\n\t" 216 "ld [%2 + 0x00], %%g3\n\t" 217 "addxcc %%g2, %%g4, %%g4\n\t" 218 "ld [%1 + 0x0c], %%g2\n\t" 219 "addxcc %%g3, %%g4, %%g4\n\t" 220 "ld [%1 + 0x08], %%g3\n\t" 221 "addxcc %%g2, %%g4, %%g4\n\t" 222 "ld [%1 + 0x04], %%g2\n\t" 223 "addxcc %%g3, %%g4, %%g4\n\t" 224 "ld [%1 + 0x00], %%g3\n\t" 225 "addxcc %%g2, %%g4, %%g4\n\t" 226 "addxcc %%g3, %%g4, %0\n\t" 227 "addx 0, %0, %0\n" 228 : "=&r" (sum) 229 : "r" (saddr), "r" (daddr), 230 "r"(htonl(len)), "r"(htonl(proto)), "r"(sum) 231 : "g2", "g3", "g4", "cc"); 232 233 return csum_fold(sum); 234} 235 236/* this routine is used for miscellaneous IP-like checksums, mainly in icmp.c */ 237static inline __sum16 ip_compute_csum(const void *buff, int len) 238{ 239 return csum_fold(csum_partial(buff, len, 0)); 240} 241 242#endif /* !(__SPARC_CHECKSUM_H) */ 243