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[/] [or1k/] [trunk/] [uclinux/] [uClinux-2.0.x/] [include/] [asm-m68knommu/] [checksum.h] - Blame information for rev 1778

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#ifndef _M68K_CHECKSUM_H
#define _M68K_CHECKSUM_H
 
#include <linux/config.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);
 
/*
 * the same as csum_partial_copy, but copies from src while it
 * checksums
 *
 * here even more important to align src and dst on a 32-bit (or even
 * better 64-bit) boundary
 */
 
unsigned int csum_partial_copy(const char *src, char *dst, int len, int sum);
 
 
/*
 * the same as csum_partial_copy, but copies from user space.
 *
 * here even more important to align src and dst on a 32-bit (or even
 * better 64-bit) boundary
 */
 
unsigned int csum_partial_copy_fromuser(const char *src, char *dst, int len, int sum);
 
unsigned short ip_fast_csum(unsigned char *iph, unsigned int ihl);
 
#ifdef BLASTED_MOTOROLA_CODE
/*
 *      This is a version of ip_compute_csum() optimized for IP headers,
 *      which always checksum on 4 octet boundaries.
 *
 */
static inline unsigned short
ip_fast_csum(unsigned char *iph, unsigned int ihl)
{
        unsigned int sum = 0;
 
        __asm__ ("subqw #1,%2\n"
                 "1:\t"
                 "movel %1@+,%/d0\n\t"
                 "addxl %/d0,%0\n\t"
                 "dbra  %2,1b\n\t"
                 "movel %0,%/d0\n\t"
                 "swap  %/d0\n\t"
                 "addxw %/d0,%0\n\t"
                 "clrw  %/d0\n\t"
                 "addxw %/d0,%0\n\t"
                 : "=d" (sum), "=a" (iph), "=d" (ihl)
                 : "0" (sum), "1" (iph), "2" (ihl)
                 : "d0");
        return ~sum;
}
#endif
 
/*
 *      Fold a partial checksum
 */
 
static inline unsigned int csum_fold(unsigned int sum)
{
#ifdef CONFIG_COLDFIRE
        sum = (sum & 0xffff) + (sum >> 16);
        sum = (sum & 0xffff) + (sum >> 16);
#else
        unsigned int tmp = sum;
        __asm__("swap %1\n\t"
                "addw %1, %0\n\t"
                "clrw %1\n\t"
                "addxw %1, %0"
                : "=&d" (sum), "=&d" (tmp)
                : "0" (sum), "1" (sum));
#endif
        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)
{
        __asm__ ("addl  %1,%0\n\t"
                 "addxl %4,%0\n\t"
                 "addxl %5,%0\n\t"
                 "clrl %1\n\t"
                 "addxl %1,%0"
                 : "=&d" (sum), "=&d" (saddr)
                 : "0" (daddr), "1" (saddr), "d" (len + proto),
                   "d"(sum));
        return csum_fold(sum);
}
 
/*
 * this routine is used for miscellaneous IP-like checksums, mainly
 * in icmp.c
 */
 
#ifdef BLASTED_MOTOROLA_CODE
static inline unsigned short
ip_compute_csum(unsigned char * buff, int len)
{
        return csum_fold (csum_partial(buff, len, 0));
}
#else
extern unsigned short
ip_compute_csum(const unsigned char * buff, int len);
#endif
 
#endif /* _M68K_CHECKSUM_H */

Line No.	Rev	Author	Line
1	199	simons	`#ifndef _M68K_CHECKSUM_H`
2			`#define _M68K_CHECKSUM_H`
3
4			`#include <linux/config.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			`unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum);`
19
20			`/*`
21			`* the same as csum_partial_copy, but copies from src while it`
22			`* checksums`
23			`*`
24			`* here even more important to align src and dst on a 32-bit (or even`
25			`* better 64-bit) boundary`
26			`*/`
27
28			`unsigned int csum_partial_copy(const char src, char dst, int len, int sum);`
29
30
31			`/*`
32			`* the same as csum_partial_copy, but copies from user space.`
33			`*`
34			`* here even more important to align src and dst on a 32-bit (or even`
35			`* better 64-bit) boundary`
36			`*/`
37
38			`unsigned int csum_partial_copy_fromuser(const char src, char dst, int len, int sum);`
39
40			`unsigned short ip_fast_csum(unsigned char *iph, unsigned int ihl);`
41
42			`#ifdef BLASTED_MOTOROLA_CODE`
43			`/*`
44			`* This is a version of ip_compute_csum() optimized for IP headers,`
45			`* which always checksum on 4 octet boundaries.`
46			`*`
47			`*/`
48			`static inline unsigned short`
49			`ip_fast_csum(unsigned char *iph, unsigned int ihl)`
50			`{`
51			`unsigned int sum = 0;`
52
53			`__asm__ ("subqw #1,%2\n"`
54			`"1:\t"`
55			`"movel %1@+,%/d0\n\t"`
56			`"addxl %/d0,%0\n\t"`
57			`"dbra %2,1b\n\t"`
58			`"movel %0,%/d0\n\t"`
59			`"swap %/d0\n\t"`
60			`"addxw %/d0,%0\n\t"`
61			`"clrw %/d0\n\t"`
62			`"addxw %/d0,%0\n\t"`
63			`: "=d" (sum), "=a" (iph), "=d" (ihl)`
64			`: "0" (sum), "1" (iph), "2" (ihl)`
65			`: "d0");`
66			`return ~sum;`
67			`}`
68			`#endif`
69
70			`/*`
71			`* Fold a partial checksum`
72			`*/`
73
74			`static inline unsigned int csum_fold(unsigned int sum)`
75			`{`
76			`#ifdef CONFIG_COLDFIRE`
77			`sum = (sum & 0xffff) + (sum >> 16);`
78			`sum = (sum & 0xffff) + (sum >> 16);`
79			`#else`
80			`unsigned int tmp = sum;`
81			`__asm__("swap %1\n\t"`
82			`"addw %1, %0\n\t"`
83			`"clrw %1\n\t"`
84			`"addxw %1, %0"`
85			`: "=&d" (sum), "=&d" (tmp)`
86			`: "0" (sum), "1" (sum));`
87			`#endif`
88			`return ~sum;`
89			`}`
90
91
92			`/*`
93			`* computes the checksum of the TCP/UDP pseudo-header`
94			`* returns a 16-bit checksum, already complemented`
95			`*/`
96
97			`static inline unsigned short int`
98			`csum_tcpudp_magic(unsigned long saddr, unsigned long daddr, unsigned short len,`
99			`unsigned short proto, unsigned int sum)`
100			`{`
101			`__asm__ ("addl %1,%0\n\t"`
102			`"addxl %4,%0\n\t"`
103			`"addxl %5,%0\n\t"`
104			`"clrl %1\n\t"`
105			`"addxl %1,%0"`
106			`: "=&d" (sum), "=&d" (saddr)`
107			`: "0" (daddr), "1" (saddr), "d" (len + proto),`
108			`"d"(sum));`
109			`return csum_fold(sum);`
110			`}`
111
112			`/*`
113			`* this routine is used for miscellaneous IP-like checksums, mainly`
114			`* in icmp.c`
115			`*/`
116
117			`#ifdef BLASTED_MOTOROLA_CODE`
118			`static inline unsigned short`
119			`ip_compute_csum(unsigned char * buff, int len)`
120			`{`
121			`return csum_fold (csum_partial(buff, len, 0));`
122			`}`
123			`#else`
124			`extern unsigned short`
125			`ip_compute_csum(const unsigned char * buff, int len);`
126			`#endif`
127
128			`#endif /* _M68K_CHECKSUM_H */`

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[/] [or1k/] [trunk/] [uclinux/] [uClinux-2.0.x/] [include/] [asm-m68knommu/] [checksum.h] - Blame information for rev 1778