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Linux/arch/sparc/include/asm/checksum_64.h

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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 __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 __wsum csum_partial_copy_nocheck(const void *src, void *dst,
 41                                  int len, __wsum sum);
 42 
 43 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 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 __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         : "" (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                                         __u32 len, __u8 proto,
100                                         __wsum sum)
101 {
102         __asm__ __volatile__(
103 "       addcc           %1, %0, %0\n"
104 "       addccc          %2, %0, %0\n"
105 "       addccc          %3, %0, %0\n"
106 "       addc            %0, %%g0, %0\n"
107         : "=r" (sum), "=r" (saddr)
108         : "r" (daddr), "r" (proto + len), "" (sum), "1" (saddr)
109         : "cc");
110         return sum;
111 }
112 
113 /*
114  * computes the checksum of the TCP/UDP pseudo-header
115  * returns a 16-bit checksum, already complemented
116  */
117 static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
118                                         __u32 len, __u8 proto,
119                                         __wsum sum)
120 {
121         return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
122 }
123 
124 #define _HAVE_ARCH_IPV6_CSUM
125 
126 static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
127                                       const struct in6_addr *daddr,
128                                       __u32 len, __u8 proto, __wsum sum)
129 {
130         __asm__ __volatile__ (
131 "       addcc           %3, %4, %%g7\n"
132 "       addccc          %5, %%g7, %%g7\n"
133 "       lduw            [%2 + 0x0c], %%g2\n"
134 "       lduw            [%2 + 0x08], %%g3\n"
135 "       addccc          %%g2, %%g7, %%g7\n"
136 "       lduw            [%2 + 0x04], %%g2\n"
137 "       addccc          %%g3, %%g7, %%g7\n"
138 "       lduw            [%2 + 0x00], %%g3\n"
139 "       addccc          %%g2, %%g7, %%g7\n"
140 "       lduw            [%1 + 0x0c], %%g2\n"
141 "       addccc          %%g3, %%g7, %%g7\n"
142 "       lduw            [%1 + 0x08], %%g3\n"
143 "       addccc          %%g2, %%g7, %%g7\n"
144 "       lduw            [%1 + 0x04], %%g2\n"
145 "       addccc          %%g3, %%g7, %%g7\n"
146 "       lduw            [%1 + 0x00], %%g3\n"
147 "       addccc          %%g2, %%g7, %%g7\n"
148 "       addccc          %%g3, %%g7, %0\n"
149 "       addc            0, %0, %0\n"
150         : "=&r" (sum)
151         : "r" (saddr), "r" (daddr), "r"(htonl(len)),
152           "r"(htonl(proto)), "r"(sum)
153         : "g2", "g3", "g7", "cc");
154 
155         return csum_fold(sum);
156 }
157 
158 /* this routine is used for miscellaneous IP-like checksums, mainly in icmp.c */
159 static inline __sum16 ip_compute_csum(const void *buff, int len)
160 {
161         return csum_fold(csum_partial(buff, len, 0));
162 }
163 
164 #define HAVE_ARCH_CSUM_ADD
165 static inline __wsum csum_add(__wsum csum, __wsum addend)
166 {
167         __asm__ __volatile__(
168                 "addcc   %0, %1, %0\n"
169                 "addx    %0, %%g0, %0"
170                 : "=r" (csum)
171                 : "r" (addend), "" (csum));
172 
173         return csum;
174 }
175 
176 #endif /* !(__SPARC64_CHECKSUM_H) */
177 

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