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Michael Hennerich
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Mike Frysinger
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Sep 17, 2009
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--- | ||
refs/heads/master: 66bc4a6f34a950c7aede597c578352c3eba82017 | ||
refs/heads/master: f39d56ec469a9ade221ceeb85a37b051374f616b |
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extern void console_print(const char *s); |
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#ifndef _M68K_CHECKSUM_H | ||
#define _M68K_CHECKSUM_H | ||
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#include <linux/in6.h> | ||
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/* | ||
* 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 | ||
*/ | ||
__wsum csum_partial(const void *buff, int len, __wsum sum); | ||
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/* | ||
* the same as csum_partial, 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 | ||
*/ | ||
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extern __wsum csum_partial_copy_from_user(const void __user *src, | ||
void *dst, | ||
int len, __wsum sum, | ||
int *csum_err); | ||
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extern __wsum csum_partial_copy_nocheck(const void *src, | ||
void *dst, int len, | ||
__wsum sum); | ||
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#ifdef CONFIG_COLDFIRE | ||
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/* | ||
* The ColdFire cores don't support all the 68k instructions used | ||
* in the optimized checksum code below. So it reverts back to using | ||
* more standard C coded checksums. The fast checksum code is | ||
* significantly larger than the optimized version, so it is not | ||
* inlined here. | ||
*/ | ||
__sum16 ip_fast_csum(const void *iph, unsigned int ihl); | ||
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static inline __sum16 csum_fold(__wsum sum) | ||
{ | ||
unsigned int tmp = (__force u32)sum; | ||
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tmp = (tmp & 0xffff) + (tmp >> 16); | ||
tmp = (tmp & 0xffff) + (tmp >> 16); | ||
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return (__force __sum16)~tmp; | ||
} | ||
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#ifdef __uClinux__ | ||
#include "checksum_no.h" | ||
#else | ||
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/* | ||
* This is a version of ip_fast_csum() optimized for IP headers, | ||
* which always checksum on 4 octet boundaries. | ||
*/ | ||
static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) | ||
{ | ||
unsigned int sum = 0; | ||
unsigned long tmp; | ||
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__asm__ ("subqw #1,%2\n" | ||
"1:\t" | ||
"movel %1@+,%3\n\t" | ||
"addxl %3,%0\n\t" | ||
"dbra %2,1b\n\t" | ||
"movel %0,%3\n\t" | ||
"swap %3\n\t" | ||
"addxw %3,%0\n\t" | ||
"clrw %3\n\t" | ||
"addxw %3,%0\n\t" | ||
: "=d" (sum), "=&a" (iph), "=&d" (ihl), "=&d" (tmp) | ||
: "0" (sum), "1" (iph), "2" (ihl) | ||
: "memory"); | ||
return (__force __sum16)~sum; | ||
} | ||
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static inline __sum16 csum_fold(__wsum sum) | ||
{ | ||
unsigned int tmp = (__force u32)sum; | ||
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__asm__("swap %1\n\t" | ||
"addw %1, %0\n\t" | ||
"clrw %1\n\t" | ||
"addxw %1, %0" | ||
: "=&d" (sum), "=&d" (tmp) | ||
: "0" (sum), "1" (tmp)); | ||
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return (__force __sum16)~sum; | ||
} | ||
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#endif /* CONFIG_COLDFIRE */ | ||
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static inline __wsum | ||
csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len, | ||
unsigned short proto, __wsum sum) | ||
{ | ||
__asm__ ("addl %2,%0\n\t" | ||
"addxl %3,%0\n\t" | ||
"addxl %4,%0\n\t" | ||
"clrl %1\n\t" | ||
"addxl %1,%0" | ||
: "=&d" (sum), "=d" (saddr) | ||
: "g" (daddr), "1" (saddr), "d" (len + proto), | ||
"0" (sum)); | ||
return sum; | ||
} | ||
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/* | ||
* computes the checksum of the TCP/UDP pseudo-header | ||
* returns a 16-bit checksum, already complemented | ||
*/ | ||
static inline __sum16 | ||
csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len, | ||
unsigned short proto, __wsum sum) | ||
{ | ||
return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); | ||
} | ||
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/* | ||
* this routine is used for miscellaneous IP-like checksums, mainly | ||
* in icmp.c | ||
*/ | ||
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static inline __sum16 ip_compute_csum(const void *buff, int len) | ||
{ | ||
return csum_fold (csum_partial(buff, len, 0)); | ||
} | ||
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#define _HAVE_ARCH_IPV6_CSUM | ||
static __inline__ __sum16 | ||
csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr, | ||
__u32 len, unsigned short proto, __wsum sum) | ||
{ | ||
register unsigned long tmp; | ||
__asm__("addl %2@,%0\n\t" | ||
"movel %2@(4),%1\n\t" | ||
"addxl %1,%0\n\t" | ||
"movel %2@(8),%1\n\t" | ||
"addxl %1,%0\n\t" | ||
"movel %2@(12),%1\n\t" | ||
"addxl %1,%0\n\t" | ||
"movel %3@,%1\n\t" | ||
"addxl %1,%0\n\t" | ||
"movel %3@(4),%1\n\t" | ||
"addxl %1,%0\n\t" | ||
"movel %3@(8),%1\n\t" | ||
"addxl %1,%0\n\t" | ||
"movel %3@(12),%1\n\t" | ||
"addxl %1,%0\n\t" | ||
"addxl %4,%0\n\t" | ||
"clrl %1\n\t" | ||
"addxl %1,%0" | ||
: "=&d" (sum), "=&d" (tmp) | ||
: "a" (saddr), "a" (daddr), "d" (len + proto), | ||
"0" (sum)); | ||
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return csum_fold(sum); | ||
} | ||
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#endif /* _M68K_CHECKSUM_H */ | ||
#include "checksum_mm.h" | ||
#endif |
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