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/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1995, 1996, 1997, 1998, 1999 by Ralf Baechle
 * Copyright (C) 1999 Silicon Graphics, Inc.
 * Copyright (C) 2001 Thiemo Seufer.
 * Copyright (C) 2002  Maciej W. Rozycki
 */
#ifndef _ASM_CHECKSUM_H
#define _ASM_CHECKSUM_H
 
#include <asm/uaccess.h>
 
/*
 * computes the checksum of a memory block at buff, length len,
 * and adds in "sum" (32-bit)
 *
 * returns a 32-bit number suitable for feeding into itself
 * or csum_tcpudp_magic
 *
 * this function must be called with even lengths, except
 * for the last fragment, which may be odd
 *
 * it's best to have buff aligned on a 32-bit boundary
 */
unsigned int csum_partial(const unsigned char *buff, int len, unsigned int sum);
 
/*
 * this is a new version of the above that records errors it finds in *errp,
 * but continues and zeros the rest of the buffer.
 */
#define csum_partial_copy_nocheck csum_partial_copy
 
/*
 * this is a new version of the above that records errors it finds in *errp,
 * but continues and zeros the rest of the buffer.
 */
unsigned int csum_partial_copy_from_user(const char *src, char *dst, int len,
                                         unsigned int sum, int *errp);
 
/*
 * Copy and checksum to user
 */
#define HAVE_CSUM_COPY_USER
static inline unsigned int csum_and_copy_to_user (const char *src, char *dst,
                                                  int len, int sum,
                                                  int *err_ptr)
{
        sum = csum_partial(src, len, sum);
 
        if (copy_to_user(dst, src, len)) {
                *err_ptr = -EFAULT;
                return -1;
        }
 
        return sum;
}
 
/*
 * the same as csum_partial, but copies from user space (but on MIPS
 * we have just one address space, so this is identical to the above)
 *
 * this is obsolete and will go away.
 */
#define csum_partial_copy_fromuser csum_partial_copy
unsigned int csum_partial_copy(const char *src, char *dst, int len,
                               unsigned int sum);
 
/*
 *      Fold a partial checksum without adding pseudo headers
 */
static inline unsigned short int csum_fold(unsigned int sum)
{
        __asm__(
        ".set\tnoat\t\t\t# csum_fold\n\t"
        "sll\t$1,%0,16\n\t"
        "addu\t%0,$1\n\t"
        "sltu\t$1,%0,$1\n\t"
        "srl\t%0,%0,16\n\t"
        "addu\t%0,$1\n\t"
        "xori\t%0,0xffff\n\t"
        ".set\tat"
        : "=r" (sum)
        : "0" (sum));
 
        return sum;
}
 
/*
 *      This is a version of ip_compute_csum() optimized for IP headers,
 *      which always checksum on 4 octet boundaries.
 *
 *      By Jorge Cwik <jorge@laser.satlink.net>, adapted for linux by
 *      Arnt Gulbrandsen.
 */
static inline unsigned short ip_fast_csum(unsigned char *iph, unsigned int ihl)
{
        unsigned int *word = (unsigned int *) iph;
        unsigned int *stop = word + ihl;
        unsigned int csum;
        int carry;
 
        csum = word[0];
        csum += word[1];
        carry = (csum < word[1]);
        csum += carry;
 
        csum += word[2];
        carry = (csum < word[2]);
        csum += carry;
 
        csum += word[3];
        carry = (csum < word[3]);
        csum += carry;
 
        word += 4;
        do {
                csum += *word;
                carry = (csum < *word);
                csum += carry;
                word++;
        } while (word != stop);
 
        return csum_fold(csum);
}
 
/*
 * computes the checksum of the TCP/UDP pseudo-header
 * returns a 16-bit checksum, already complemented
 *
 * Cast unsigned short expressions to unsigned long explicitly
 * to avoid surprises resulting from implicit promotions to
 * signed int.  --macro
 */
static inline unsigned long csum_tcpudp_nofold(unsigned long saddr,
                                               unsigned long daddr,
                                               unsigned short len,
                                               unsigned short proto,
                                               unsigned int sum)
{
        __asm__(
        ".set\tnoat\t\t\t# csum_tcpudp_nofold\n\t"
        "daddu\t%0, %2\n\t"
        "daddu\t%0, %3\n\t"
        "daddu\t%0, %4\n\t"
        "dsll32\t$1, %0, 0\n\t"
        "daddu\t%0, $1\n\t"
        "dsrl32\t%0, %0, 0\n\t"
        ".set\tat"
        : "=&r" (sum)
        : "0" (daddr), "r"(saddr),
#ifdef __MIPSEL__
          "r" (((unsigned long)ntohs(len)<<16)+proto*256),
#else
          "r" (((unsigned long)(proto)<<16)+len),
#endif
          "r" (sum));
 
        return sum;
}
 
/*
 * computes the checksum of the TCP/UDP pseudo-header
 * returns a 16-bit checksum, already complemented
 */
static inline unsigned short int csum_tcpudp_magic(unsigned long saddr,
                                                   unsigned long daddr,
                                                   unsigned short len,
                                                   unsigned short proto,
                                                   unsigned int sum)
{
        return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));
}
 
/*
 * this routine is used for miscellaneous IP-like checksums, mainly
 * in icmp.c
 */
static inline unsigned short ip_compute_csum(unsigned char * buff, int len)
{
        return csum_fold(csum_partial(buff, len, 0));
}
 
#define _HAVE_ARCH_IPV6_CSUM
static __inline__ unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
                                                     struct in6_addr *daddr,
                                                     __u32 len,
                                                     unsigned short proto,
                                                     unsigned int sum)
{
        __asm__(
        ".set\tpush\t\t\t# csum_ipv6_magic\n\t"
        ".set\tnoreorder\n\t"
        ".set\tnoat\n\t"
        "addu\t%0, %5\t\t\t# proto (long in network byte order)\n\t"
        "sltu\t$1, %0, %5\n\t"
        "addu\t%0, $1\n\t"
 
        "addu\t%0, %6\t\t\t# csum\n\t"
        "sltu\t$1, %0, %6\n\t"
        "lw\t%1, 0(%2)\t\t\t# four words source address\n\t"
        "addu\t%0, $1\n\t"
        "addu\t%0, %1\n\t"
        "sltu\t$1, %0, %1\n\t"
 
        "lw\t%1, 4(%2)\n\t"
        "addu\t%0, $1\n\t"
        "addu\t%0, %1\n\t"
        "sltu\t$1, %0, %1\n\t"
 
        "lw\t%1, 8(%2)\n\t"
        "addu\t%0, $1\n\t"
        "addu\t%0, %1\n\t"
        "sltu\t$1, %0, %1\n\t"
 
        "lw\t%1, 12(%2)\n\t"
        "addu\t%0, $1\n\t"
        "addu\t%0, %1\n\t"
        "sltu\t$1, %0, %1\n\t"
 
        "lw\t%1, 0(%3)\n\t"
        "addu\t%0, $1\n\t"
        "addu\t%0, %1\n\t"
        "sltu\t$1, %0, %1\n\t"
 
        "lw\t%1, 4(%3)\n\t"
        "addu\t%0, $1\n\t"
        "addu\t%0, %1\n\t"
        "sltu\t$1, %0, %1\n\t"
 
        "lw\t%1, 8(%3)\n\t"
        "addu\t%0, $1\n\t"
        "addu\t%0, %1\n\t"
        "sltu\t$1, %0, %1\n\t"
 
        "lw\t%1, 12(%3)\n\t"
        "addu\t%0, $1\n\t"
        "addu\t%0, %1\n\t"
        "sltu\t$1, %0, %1\n\t"
 
        "addu\t%0, $1\t\t\t# Add final carry\n\t"
        ".set\tpop"
        : "=&r" (sum), "=&r" (proto)
        : "r" (saddr), "r" (daddr),
          "0" (htonl(len)), "1" (htonl(proto)), "r" (sum));
 
        return csum_fold(sum);
}
 
#endif /* _ASM_CHECKSUM_H */

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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [include/] [asm-mips64/] [checksum.h] - Blame information for rev 1774

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* This file is subject to the terms and conditions of the GNU General Public`
3			`* License. See the file "COPYING" in the main directory of this archive`
4			`* for more details.`
5			`*`
6			`* Copyright (C) 1995, 1996, 1997, 1998, 1999 by Ralf Baechle`
7			`* Copyright (C) 1999 Silicon Graphics, Inc.`
8			`* Copyright (C) 2001 Thiemo Seufer.`
9			`* Copyright (C) 2002 Maciej W. Rozycki`
10			`*/`
11			`#ifndef _ASM_CHECKSUM_H`
12			`#define _ASM_CHECKSUM_H`
13
14			`#include <asm/uaccess.h>`
15
16			`/*`
17			`* computes the checksum of a memory block at buff, length len,`
18			`* and adds in "sum" (32-bit)`
19			`*`
20			`* returns a 32-bit number suitable for feeding into itself`
21			`* or csum_tcpudp_magic`
22			`*`
23			`* this function must be called with even lengths, except`
24			`* for the last fragment, which may be odd`
25			`*`
26			`* it's best to have buff aligned on a 32-bit boundary`
27			`*/`
28			`unsigned int csum_partial(const unsigned char *buff, int len, unsigned int sum);`
29
30			`/*`
31			`* this is a new version of the above that records errors it finds in *errp,`
32			`* but continues and zeros the rest of the buffer.`
33			`*/`
34			`#define csum_partial_copy_nocheck csum_partial_copy`
35
36			`/*`
37			`* this is a new version of the above that records errors it finds in *errp,`
38			`* but continues and zeros the rest of the buffer.`
39			`*/`
40			`unsigned int csum_partial_copy_from_user(const char src, char dst, int len,`
41			`unsigned int sum, int *errp);`
42
43			`/*`
44			`* Copy and checksum to user`
45			`*/`
46			`#define HAVE_CSUM_COPY_USER`
47			`static inline unsigned int csum_and_copy_to_user (const char src, char dst,`
48			`int len, int sum,`
49			`int *err_ptr)`
50			`{`
51			`sum = csum_partial(src, len, sum);`
52
53			`if (copy_to_user(dst, src, len)) {`
54			`*err_ptr = -EFAULT;`
55			`return -1;`
56			`}`
57
58			`return sum;`
59			`}`
60
61			`/*`
62			`* the same as csum_partial, but copies from user space (but on MIPS`
63			`* we have just one address space, so this is identical to the above)`
64			`*`
65			`* this is obsolete and will go away.`
66			`*/`
67			`#define csum_partial_copy_fromuser csum_partial_copy`
68			`unsigned int csum_partial_copy(const char src, char dst, int len,`
69			`unsigned int sum);`
70
71			`/*`
72			`* Fold a partial checksum without adding pseudo headers`
73			`*/`
74			`static inline unsigned short int csum_fold(unsigned int sum)`
75			`{`
76			`__asm__(`
77			`".set\tnoat\t\t\t# csum_fold\n\t"`
78			`"sll\t$1,%0,16\n\t"`
79			`"addu\t%0,$1\n\t"`
80			`"sltu\t$1,%0,$1\n\t"`
81			`"srl\t%0,%0,16\n\t"`
82			`"addu\t%0,$1\n\t"`
83			`"xori\t%0,0xffff\n\t"`
84			`".set\tat"`
85			`: "=r" (sum)`
86			`: "0" (sum));`
87
88			`return sum;`
89			`}`
90
91			`/*`
92			`* This is a version of ip_compute_csum() optimized for IP headers,`
93			`* which always checksum on 4 octet boundaries.`
94			`*`
95			`* By Jorge Cwik <jorge@laser.satlink.net>, adapted for linux by`
96			`* Arnt Gulbrandsen.`
97			`*/`
98			`static inline unsigned short ip_fast_csum(unsigned char *iph, unsigned int ihl)`
99			`{`
100			`unsigned int word = (unsigned int ) iph;`
101			`unsigned int *stop = word + ihl;`
102			`unsigned int csum;`
103			`int carry;`
104
105			`csum = word[0];`
106			`csum += word[1];`
107			`carry = (csum < word[1]);`
108			`csum += carry;`
109
110			`csum += word[2];`
111			`carry = (csum < word[2]);`
112			`csum += carry;`
113
114			`csum += word[3];`
115			`carry = (csum < word[3]);`
116			`csum += carry;`
117
118			`word += 4;`
119			`do {`
120			`csum += *word;`
121			`carry = (csum < *word);`
122			`csum += carry;`
123			`word++;`
124			`} while (word != stop);`
125
126			`return csum_fold(csum);`
127			`}`
128
129			`/*`
130			`* computes the checksum of the TCP/UDP pseudo-header`
131			`* returns a 16-bit checksum, already complemented`
132			`*`
133			`* Cast unsigned short expressions to unsigned long explicitly`
134			`* to avoid surprises resulting from implicit promotions to`
135			`* signed int. --macro`
136			`*/`
137			`static inline unsigned long csum_tcpudp_nofold(unsigned long saddr,`
138			`unsigned long daddr,`
139			`unsigned short len,`
140			`unsigned short proto,`
141			`unsigned int sum)`
142			`{`
143			`__asm__(`
144			`".set\tnoat\t\t\t# csum_tcpudp_nofold\n\t"`
145			`"daddu\t%0, %2\n\t"`
146			`"daddu\t%0, %3\n\t"`
147			`"daddu\t%0, %4\n\t"`
148			`"dsll32\t$1, %0, 0\n\t"`
149			`"daddu\t%0, $1\n\t"`
150			`"dsrl32\t%0, %0, 0\n\t"`
151			`".set\tat"`
152			`: "=&r" (sum)`
153			`: "0" (daddr), "r"(saddr),`
154			`#ifdef __MIPSEL__`
155			`"r" (((unsigned long)ntohs(len)<<16)+proto*256),`
156			`#else`
157			`"r" (((unsigned long)(proto)<<16)+len),`
158			`#endif`
159			`"r" (sum));`
160
161			`return sum;`
162			`}`
163
164			`/*`
165			`* computes the checksum of the TCP/UDP pseudo-header`
166			`* returns a 16-bit checksum, already complemented`
167			`*/`
168			`static inline unsigned short int csum_tcpudp_magic(unsigned long saddr,`
169			`unsigned long daddr,`
170			`unsigned short len,`
171			`unsigned short proto,`
172			`unsigned int sum)`
173			`{`
174			`return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));`
175			`}`
176
177			`/*`
178			`* this routine is used for miscellaneous IP-like checksums, mainly`
179			`* in icmp.c`
180			`*/`
181			`static inline unsigned short ip_compute_csum(unsigned char * buff, int len)`
182			`{`
183			`return csum_fold(csum_partial(buff, len, 0));`
184			`}`
185
186			`#define _HAVE_ARCH_IPV6_CSUM`
187			`static __inline__ unsigned short int csum_ipv6_magic(struct in6_addr *saddr,`
188			`struct in6_addr *daddr,`
189			`__u32 len,`
190			`unsigned short proto,`
191			`unsigned int sum)`
192			`{`
193			`__asm__(`
194			`".set\tpush\t\t\t# csum_ipv6_magic\n\t"`
195			`".set\tnoreorder\n\t"`
196			`".set\tnoat\n\t"`
197			`"addu\t%0, %5\t\t\t# proto (long in network byte order)\n\t"`
198			`"sltu\t$1, %0, %5\n\t"`
199			`"addu\t%0, $1\n\t"`
200
201			`"addu\t%0, %6\t\t\t# csum\n\t"`
202			`"sltu\t$1, %0, %6\n\t"`
203			`"lw\t%1, 0(%2)\t\t\t# four words source address\n\t"`
204			`"addu\t%0, $1\n\t"`
205			`"addu\t%0, %1\n\t"`
206			`"sltu\t$1, %0, %1\n\t"`
207
208			`"lw\t%1, 4(%2)\n\t"`
209			`"addu\t%0, $1\n\t"`
210			`"addu\t%0, %1\n\t"`
211			`"sltu\t$1, %0, %1\n\t"`
212
213			`"lw\t%1, 8(%2)\n\t"`
214			`"addu\t%0, $1\n\t"`
215			`"addu\t%0, %1\n\t"`
216			`"sltu\t$1, %0, %1\n\t"`
217
218			`"lw\t%1, 12(%2)\n\t"`
219			`"addu\t%0, $1\n\t"`
220			`"addu\t%0, %1\n\t"`
221			`"sltu\t$1, %0, %1\n\t"`
222
223			`"lw\t%1, 0(%3)\n\t"`
224			`"addu\t%0, $1\n\t"`
225			`"addu\t%0, %1\n\t"`
226			`"sltu\t$1, %0, %1\n\t"`
227
228			`"lw\t%1, 4(%3)\n\t"`
229			`"addu\t%0, $1\n\t"`
230			`"addu\t%0, %1\n\t"`
231			`"sltu\t$1, %0, %1\n\t"`
232
233			`"lw\t%1, 8(%3)\n\t"`
234			`"addu\t%0, $1\n\t"`
235			`"addu\t%0, %1\n\t"`
236			`"sltu\t$1, %0, %1\n\t"`
237
238			`"lw\t%1, 12(%3)\n\t"`
239			`"addu\t%0, $1\n\t"`
240			`"addu\t%0, %1\n\t"`
241			`"sltu\t$1, %0, %1\n\t"`
242
243			`"addu\t%0, $1\t\t\t# Add final carry\n\t"`
244			`".set\tpop"`
245			`: "=&r" (sum), "=&r" (proto)`
246			`: "r" (saddr), "r" (daddr),`
247			`"0" (htonl(len)), "1" (htonl(proto)), "r" (sum));`
248
249			`return csum_fold(sum);`
250			`}`
251
252			`#endif /* _ASM_CHECKSUM_H */`