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Linux/arch/sh/include/asm/checksum_32.h

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  1 #ifndef __ASM_SH_CHECKSUM_H
  2 #define __ASM_SH_CHECKSUM_H
  3 
  4 /*
  5  * This file is subject to the terms and conditions of the GNU General Public
  6  * License.  See the file "COPYING" in the main directory of this archive
  7  * for more details.
  8  *
  9  * Copyright (C) 1999 by Kaz Kojima & Niibe Yutaka
 10  */
 11 
 12 #include <linux/in6.h>
 13 
 14 /*
 15  * computes the checksum of a memory block at buff, length len,
 16  * and adds in "sum" (32-bit)
 17  *
 18  * returns a 32-bit number suitable for feeding into itself
 19  * or csum_tcpudp_magic
 20  *
 21  * this function must be called with even lengths, except
 22  * for the last fragment, which may be odd
 23  *
 24  * it's best to have buff aligned on a 32-bit boundary
 25  */
 26 asmlinkage __wsum csum_partial(const void *buff, int len, __wsum sum);
 27 
 28 /*
 29  * the same as csum_partial, but copies from src while it
 30  * checksums, and handles user-space pointer exceptions correctly, when needed.
 31  *
 32  * here even more important to align src and dst on a 32-bit (or even
 33  * better 64-bit) boundary
 34  */
 35 
 36 asmlinkage __wsum csum_partial_copy_generic(const void *src, void *dst,
 37                                             int len, __wsum sum,
 38                                             int *src_err_ptr, int *dst_err_ptr);
 39 
 40 /*
 41  *      Note: when you get a NULL pointer exception here this means someone
 42  *      passed in an incorrect kernel address to one of these functions.
 43  *
 44  *      If you use these functions directly please don't forget the
 45  *      access_ok().
 46  */
 47 static inline
 48 __wsum csum_partial_copy_nocheck(const void *src, void *dst,
 49                                  int len, __wsum sum)
 50 {
 51         return csum_partial_copy_generic(src, dst, len, sum, NULL, NULL);
 52 }
 53 
 54 static inline
 55 __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
 56                                    int len, __wsum sum, int *err_ptr)
 57 {
 58         return csum_partial_copy_generic((__force const void *)src, dst,
 59                                         len, sum, err_ptr, NULL);
 60 }
 61 
 62 /*
 63  *      Fold a partial checksum
 64  */
 65 
 66 static inline __sum16 csum_fold(__wsum sum)
 67 {
 68         unsigned int __dummy;
 69         __asm__("swap.w %0, %1\n\t"
 70                 "extu.w %0, %0\n\t"
 71                 "extu.w %1, %1\n\t"
 72                 "add    %1, %0\n\t"
 73                 "swap.w %0, %1\n\t"
 74                 "add    %1, %0\n\t"
 75                 "not    %0, %0\n\t"
 76                 : "=r" (sum), "=&r" (__dummy)
 77                 : "" (sum)
 78                 : "t");
 79         return (__force __sum16)sum;
 80 }
 81 
 82 /*
 83  *      This is a version of ip_compute_csum() optimized for IP headers,
 84  *      which always checksum on 4 octet boundaries.
 85  *
 86  *      i386 version by Jorge Cwik <jorge@laser.satlink.net>, adapted
 87  *      for linux by * Arnt Gulbrandsen.
 88  */
 89 static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
 90 {
 91         unsigned int sum, __dummy0, __dummy1;
 92 
 93         __asm__ __volatile__(
 94                 "mov.l  @%1+, %0\n\t"
 95                 "mov.l  @%1+, %3\n\t"
 96                 "add    #-2, %2\n\t"
 97                 "clrt\n\t"
 98                 "1:\t"
 99                 "addc   %3, %0\n\t"
100                 "movt   %4\n\t"
101                 "mov.l  @%1+, %3\n\t"
102                 "dt     %2\n\t"
103                 "bf/s   1b\n\t"
104                 " cmp/eq #1, %4\n\t"
105                 "addc   %3, %0\n\t"
106                 "addc   %2, %0"     /* Here %2 is 0, add carry-bit */
107         /* Since the input registers which are loaded with iph and ihl
108            are modified, we must also specify them as outputs, or gcc
109            will assume they contain their original values. */
110         : "=r" (sum), "=r" (iph), "=r" (ihl), "=&r" (__dummy0), "=&z" (__dummy1)
111         : "1" (iph), "2" (ihl)
112         : "t", "memory");
113 
114         return  csum_fold(sum);
115 }
116 
117 static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
118                                         __u32 len, __u8 proto,
119                                         __wsum sum)
120 {
121 #ifdef __LITTLE_ENDIAN__
122         unsigned long len_proto = (proto + len) << 8;
123 #else
124         unsigned long len_proto = proto + len;
125 #endif
126         __asm__("clrt\n\t"
127                 "addc   %0, %1\n\t"
128                 "addc   %2, %1\n\t"
129                 "addc   %3, %1\n\t"
130                 "movt   %0\n\t"
131                 "add    %1, %0"
132                 : "=r" (sum), "=r" (len_proto)
133                 : "r" (daddr), "r" (saddr), "1" (len_proto), "" (sum)
134                 : "t");
135 
136         return sum;
137 }
138 
139 /*
140  * computes the checksum of the TCP/UDP pseudo-header
141  * returns a 16-bit checksum, already complemented
142  */
143 static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
144                                         __u32 len, __u8 proto,
145                                         __wsum sum)
146 {
147         return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));
148 }
149 
150 /*
151  * this routine is used for miscellaneous IP-like checksums, mainly
152  * in icmp.c
153  */
154 static inline __sum16 ip_compute_csum(const void *buff, int len)
155 {
156     return csum_fold(csum_partial(buff, len, 0));
157 }
158 
159 #define _HAVE_ARCH_IPV6_CSUM
160 static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
161                                       const struct in6_addr *daddr,
162                                       __u32 len, __u8 proto, __wsum sum)
163 {
164         unsigned int __dummy;
165         __asm__("clrt\n\t"
166                 "mov.l  @(0,%2), %1\n\t"
167                 "addc   %1, %0\n\t"
168                 "mov.l  @(4,%2), %1\n\t"
169                 "addc   %1, %0\n\t"
170                 "mov.l  @(8,%2), %1\n\t"
171                 "addc   %1, %0\n\t"
172                 "mov.l  @(12,%2), %1\n\t"
173                 "addc   %1, %0\n\t"
174                 "mov.l  @(0,%3), %1\n\t"
175                 "addc   %1, %0\n\t"
176                 "mov.l  @(4,%3), %1\n\t"
177                 "addc   %1, %0\n\t"
178                 "mov.l  @(8,%3), %1\n\t"
179                 "addc   %1, %0\n\t"
180                 "mov.l  @(12,%3), %1\n\t"
181                 "addc   %1, %0\n\t"
182                 "addc   %4, %0\n\t"
183                 "addc   %5, %0\n\t"
184                 "movt   %1\n\t"
185                 "add    %1, %0\n"
186                 : "=r" (sum), "=&r" (__dummy)
187                 : "r" (saddr), "r" (daddr),
188                   "r" (htonl(len)), "r" (htonl(proto)), "" (sum)
189                 : "t");
190 
191         return csum_fold(sum);
192 }
193 
194 /*
195  *      Copy and checksum to user
196  */
197 #define HAVE_CSUM_COPY_USER
198 static inline __wsum csum_and_copy_to_user(const void *src,
199                                            void __user *dst,
200                                            int len, __wsum sum,
201                                            int *err_ptr)
202 {
203         if (access_ok(VERIFY_WRITE, dst, len))
204                 return csum_partial_copy_generic((__force const void *)src,
205                                                 dst, len, sum, NULL, err_ptr);
206 
207         if (len)
208                 *err_ptr = -EFAULT;
209 
210         return (__force __wsum)-1; /* invalid checksum */
211 }
212 #endif /* __ASM_SH_CHECKSUM_H */
213 

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