879178cfbe
* sanitize prototypes, annotate * kill useless shifts Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
118 lines
3.5 KiB
C
118 lines
3.5 KiB
C
#ifndef _ASM_POWERPC_CHECKSUM_H
|
|
#define _ASM_POWERPC_CHECKSUM_H
|
|
#ifdef __KERNEL__
|
|
|
|
/*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
/*
|
|
* This is a version of ip_compute_csum() optimized for IP headers,
|
|
* which always checksum on 4 octet boundaries. ihl is the number
|
|
* of 32-bit words and is always >= 5.
|
|
*/
|
|
extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
|
|
|
|
/*
|
|
* computes the checksum of the TCP/UDP pseudo-header
|
|
* returns a 16-bit checksum, already complemented
|
|
*/
|
|
extern __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
|
|
unsigned short len,
|
|
unsigned short proto,
|
|
__wsum sum);
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
extern __wsum csum_partial(const void *buff, int len, __wsum sum);
|
|
|
|
/*
|
|
* Computes the checksum of a memory block at src, length len,
|
|
* and adds in "sum" (32-bit), while copying the block to dst.
|
|
* If an access exception occurs on src or dst, it stores -EFAULT
|
|
* to *src_err or *dst_err respectively (if that pointer is not
|
|
* NULL), and, for an error on src, zeroes the rest of dst.
|
|
*
|
|
* Like csum_partial, this must be called with even lengths,
|
|
* except for the last fragment.
|
|
*/
|
|
extern __wsum csum_partial_copy_generic(const void *src, void *dst,
|
|
int len, __wsum sum,
|
|
int *src_err, int *dst_err);
|
|
/*
|
|
* the same as csum_partial, but copies from src to dst while it
|
|
* checksums.
|
|
*/
|
|
#define csum_partial_copy_from_user(src, dst, len, sum, errp) \
|
|
csum_partial_copy_generic((__force const void *)(src), (dst), (len), (sum), (errp), NULL)
|
|
|
|
#define csum_partial_copy_nocheck(src, dst, len, sum) \
|
|
csum_partial_copy_generic((src), (dst), (len), (sum), NULL, NULL)
|
|
|
|
|
|
/*
|
|
* turns a 32-bit partial checksum (e.g. from csum_partial) into a
|
|
* 1's complement 16-bit checksum.
|
|
*/
|
|
static inline __sum16 csum_fold(__wsum sum)
|
|
{
|
|
unsigned int tmp;
|
|
|
|
/* swap the two 16-bit halves of sum */
|
|
__asm__("rlwinm %0,%1,16,0,31" : "=r" (tmp) : "r" (sum));
|
|
/* if there is a carry from adding the two 16-bit halves,
|
|
it will carry from the lower half into the upper half,
|
|
giving us the correct sum in the upper half. */
|
|
return (__force __sum16)(~((__force u32)sum + tmp) >> 16);
|
|
}
|
|
|
|
/*
|
|
* this routine is used for miscellaneous IP-like checksums, mainly
|
|
* in icmp.c
|
|
*/
|
|
static inline __sum16 ip_compute_csum(const void *buff, int len)
|
|
{
|
|
return csum_fold(csum_partial(buff, len, 0));
|
|
}
|
|
|
|
static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
|
|
unsigned short len,
|
|
unsigned short proto,
|
|
__wsum sum)
|
|
{
|
|
#ifdef __powerpc64__
|
|
unsigned long s = (__force u32)sum;
|
|
|
|
s += (__force u32)saddr;
|
|
s += (__force u32)daddr;
|
|
s += proto + len;
|
|
s += (s >> 32);
|
|
return (__force __wsum) s;
|
|
#else
|
|
__asm__("\n\
|
|
addc %0,%0,%1 \n\
|
|
adde %0,%0,%2 \n\
|
|
adde %0,%0,%3 \n\
|
|
addze %0,%0 \n\
|
|
"
|
|
: "=r" (sum)
|
|
: "r" (daddr), "r"(saddr), "r"(proto + len), "0"(sum));
|
|
return sum;
|
|
#endif
|
|
}
|
|
#endif /* __KERNEL__ */
|
|
#endif
|