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Linux/arch/parisc/include/asm/checksum.h

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  1 #ifndef _PARISC_CHECKSUM_H
  2 #define _PARISC_CHECKSUM_H
  3 
  4 #include <linux/in6.h>
  5 
  6 /*
  7  * computes the checksum of a memory block at buff, length len,
  8  * and adds in "sum" (32-bit)
  9  *
 10  * returns a 32-bit number suitable for feeding into itself
 11  * or csum_tcpudp_magic
 12  *
 13  * this function must be called with even lengths, except
 14  * for the last fragment, which may be odd
 15  *
 16  * it's best to have buff aligned on a 32-bit boundary
 17  */
 18 extern __wsum csum_partial(const void *, int, __wsum);
 19 
 20 /*
 21  * The same as csum_partial, but copies from src while it checksums.
 22  *
 23  * Here even more important to align src and dst on a 32-bit (or even
 24  * better 64-bit) boundary
 25  */
 26 extern __wsum csum_partial_copy_nocheck(const void *, void *, int, __wsum);
 27 
 28 /*
 29  * this is a new version of the above that records errors it finds in *errp,
 30  * but continues and zeros the rest of the buffer.
 31  */
 32 extern __wsum csum_partial_copy_from_user(const void __user *src,
 33                 void *dst, int len, __wsum sum, int *errp);
 34 
 35 /*
 36  *      Optimized for IP headers, which always checksum on 4 octet boundaries.
 37  *
 38  *      Written by Randolph Chung <tausq@debian.org>, and then mucked with by
 39  *      LaMont Jones <lamont@debian.org>
 40  */
 41 static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
 42 {
 43         unsigned int sum;
 44 
 45         __asm__ __volatile__ (
 46 "       ldws,ma         4(%1), %0\n"
 47 "       addib,<=        -4, %2, 2f\n"
 48 "\n"
 49 "       ldws            4(%1), %%r20\n"
 50 "       ldws            8(%1), %%r21\n"
 51 "       add             %0, %%r20, %0\n"
 52 "       ldws,ma         12(%1), %%r19\n"
 53 "       addc            %0, %%r21, %0\n"
 54 "       addc            %0, %%r19, %0\n"
 55 "1:     ldws,ma         4(%1), %%r19\n"
 56 "       addib,<         0, %2, 1b\n"
 57 "       addc            %0, %%r19, %0\n"
 58 "\n"
 59 "       extru           %0, 31, 16, %%r20\n"
 60 "       extru           %0, 15, 16, %%r21\n"
 61 "       addc            %%r20, %%r21, %0\n"
 62 "       extru           %0, 15, 16, %%r21\n"
 63 "       add             %0, %%r21, %0\n"
 64 "       subi            -1, %0, %0\n"
 65 "2:\n"
 66         : "=r" (sum), "=r" (iph), "=r" (ihl)
 67         : "1" (iph), "2" (ihl)
 68         : "r19", "r20", "r21", "memory");
 69 
 70         return (__force __sum16)sum;
 71 }
 72 
 73 /*
 74  *      Fold a partial checksum
 75  */
 76 static inline __sum16 csum_fold(__wsum csum)
 77 {
 78         u32 sum = (__force u32)csum;
 79         /* add the swapped two 16-bit halves of sum,
 80            a possible carry from adding the two 16-bit halves,
 81            will carry from the lower half into the upper half,
 82            giving us the correct sum in the upper half. */
 83         sum += (sum << 16) + (sum >> 16);
 84         return (__force __sum16)(~sum >> 16);
 85 }
 86  
 87 static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
 88                                         __u32 len, __u8 proto,
 89                                         __wsum sum)
 90 {
 91         __asm__(
 92         "       add  %1, %0, %0\n"
 93         "       addc %2, %0, %0\n"
 94         "       addc %3, %0, %0\n"
 95         "       addc %%r0, %0, %0\n"
 96                 : "=r" (sum)
 97                 : "r" (daddr), "r"(saddr), "r"(proto+len), ""(sum));
 98         return sum;
 99 }
100 
101 /*
102  * computes the checksum of the TCP/UDP pseudo-header
103  * returns a 16-bit checksum, already complemented
104  */
105 static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
106                                         __u32 len, __u8 proto,
107                                         __wsum sum)
108 {
109         return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
110 }
111 
112 /*
113  * this routine is used for miscellaneous IP-like checksums, mainly
114  * in icmp.c
115  */
116 static inline __sum16 ip_compute_csum(const void *buf, int len)
117 {
118          return csum_fold (csum_partial(buf, len, 0));
119 }
120 
121 
122 #define _HAVE_ARCH_IPV6_CSUM
123 static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
124                                           const struct in6_addr *daddr,
125                                           __u32 len, __u8 proto,
126                                           __wsum sum)
127 {
128         __asm__ __volatile__ (
129 
130 #if BITS_PER_LONG > 32
131 
132         /*
133         ** We can execute two loads and two adds per cycle on PA 8000.
134         ** But add insn's get serialized waiting for the carry bit.
135         ** Try to keep 4 registers with "live" values ahead of the ALU.
136         */
137 
138 "       ldd,ma          8(%1), %%r19\n" /* get 1st saddr word */
139 "       ldd,ma          8(%2), %%r20\n" /* get 1st daddr word */
140 "       add             %8, %3, %3\n"/* add 16-bit proto + len */
141 "       add             %%r19, %0, %0\n"
142 "       ldd,ma          8(%1), %%r21\n" /* 2cd saddr */
143 "       ldd,ma          8(%2), %%r22\n" /* 2cd daddr */
144 "       add,dc          %%r20, %0, %0\n"
145 "       add,dc          %%r21, %0, %0\n"
146 "       add,dc          %%r22, %0, %0\n"
147 "       add,dc          %3, %0, %0\n"  /* fold in proto+len | carry bit */
148 "       extrd,u         %0, 31, 32, %%r19\n"    /* copy upper half down */
149 "       depdi           0, 31, 32, %0\n"        /* clear upper half */
150 "       add             %%r19, %0, %0\n"        /* fold into 32-bits */
151 "       addc            0, %0, %0\n"            /* add carry */
152 
153 #else
154 
155         /*
156         ** For PA 1.x, the insn order doesn't matter as much.
157         ** Insn stream is serialized on the carry bit here too.
158         ** result from the previous operation (eg r0 + x)
159         */
160 
161 "       ldw,ma          4(%1), %%r19\n" /* get 1st saddr word */
162 "       ldw,ma          4(%2), %%r20\n" /* get 1st daddr word */
163 "       add             %8, %3, %3\n"   /* add 16-bit proto + len */
164 "       add             %%r19, %0, %0\n"
165 "       ldw,ma          4(%1), %%r21\n" /* 2cd saddr */
166 "       addc            %%r20, %0, %0\n"
167 "       ldw,ma          4(%2), %%r22\n" /* 2cd daddr */
168 "       addc            %%r21, %0, %0\n"
169 "       ldw,ma          4(%1), %%r19\n" /* 3rd saddr */
170 "       addc            %%r22, %0, %0\n"
171 "       ldw,ma          4(%2), %%r20\n" /* 3rd daddr */
172 "       addc            %%r19, %0, %0\n"
173 "       ldw,ma          4(%1), %%r21\n" /* 4th saddr */
174 "       addc            %%r20, %0, %0\n"
175 "       ldw,ma          4(%2), %%r22\n" /* 4th daddr */
176 "       addc            %%r21, %0, %0\n"
177 "       addc            %%r22, %0, %0\n"
178 "       addc            %3, %0, %0\n"   /* fold in proto+len, catch carry */
179 
180 #endif
181         : "=r" (sum), "=r" (saddr), "=r" (daddr), "=r" (len)
182         : "" (sum), "1" (saddr), "2" (daddr), "3" (len), "r" (proto)
183         : "r19", "r20", "r21", "r22", "memory");
184         return csum_fold(sum);
185 }
186 
187 /* 
188  *      Copy and checksum to user
189  */
190 #define HAVE_CSUM_COPY_USER
191 static __inline__ __wsum csum_and_copy_to_user(const void *src,
192                                                       void __user *dst,
193                                                       int len, __wsum sum,
194                                                       int *err_ptr)
195 {
196         /* code stolen from include/asm-mips64 */
197         sum = csum_partial(src, len, sum);
198          
199         if (copy_to_user(dst, src, len)) {
200                 *err_ptr = -EFAULT;
201                 return (__force __wsum)-1;
202         }
203 
204         return sum;
205 }
206 
207 #endif
208 
209 

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