mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 04:34:11 +08:00
623cdf4a04
Signed-off-by: Miles Bader <miles@gnu.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
117 lines
2.9 KiB
C
117 lines
2.9 KiB
C
/*
|
|
* include/asm-v850/checksum.h -- Checksum ops
|
|
*
|
|
* Copyright (C) 2001,2005 NEC Corporation
|
|
* Copyright (C) 2001,2005 Miles Bader <miles@gnu.org>
|
|
*
|
|
* 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.
|
|
*
|
|
* Written by Miles Bader <miles@gnu.org>
|
|
*/
|
|
|
|
#ifndef __V850_CHECKSUM_H__
|
|
#define __V850_CHECKSUM_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
|
|
*/
|
|
extern unsigned int csum_partial (const unsigned char * buff, int len,
|
|
unsigned int sum);
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
extern unsigned csum_partial_copy (const unsigned char *src,
|
|
unsigned char *dst, int len, unsigned 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
|
|
*/
|
|
extern unsigned csum_partial_copy_from_user (const unsigned char *src,
|
|
unsigned char *dst,
|
|
int len, unsigned sum,
|
|
int *csum_err);
|
|
|
|
#define csum_partial_copy_nocheck(src, dst, len, sum) \
|
|
csum_partial_copy ((src), (dst), (len), (sum))
|
|
|
|
unsigned short ip_fast_csum (unsigned char *iph, unsigned int ihl);
|
|
|
|
/*
|
|
* Fold a partial checksum
|
|
*/
|
|
static inline unsigned int csum_fold (unsigned long sum)
|
|
{
|
|
unsigned int result;
|
|
/*
|
|
%0 %1
|
|
hsw %1, %0 H L L H
|
|
add %1, %0 H L H+L+C H+L
|
|
*/
|
|
asm ("hsw %1, %0; add %1, %0" : "=&r" (result) : "r" (sum));
|
|
return (~result) >> 16;
|
|
}
|
|
|
|
|
|
/*
|
|
* computes the checksum of the TCP/UDP pseudo-header
|
|
* returns a 16-bit checksum, already complemented
|
|
*/
|
|
static inline unsigned int
|
|
csum_tcpudp_nofold (unsigned long saddr, unsigned long daddr,
|
|
unsigned short len,
|
|
unsigned short proto, unsigned int sum)
|
|
{
|
|
int __carry;
|
|
__asm__ ("add %2, %0;"
|
|
"setf c, %1;"
|
|
"add %1, %0;"
|
|
"add %3, %0;"
|
|
"setf c, %1;"
|
|
"add %1, %0;"
|
|
"add %4, %0;"
|
|
"setf c, %1;"
|
|
"add %1, %0"
|
|
: "=&r" (sum), "=&r" (__carry)
|
|
: "r" (daddr), "r" (saddr),
|
|
"r" (ntohs (len) + (proto << 8)),
|
|
"0" (sum));
|
|
return sum;
|
|
}
|
|
|
|
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
|
|
*/
|
|
extern unsigned short ip_compute_csum (const unsigned char * buff, int len);
|
|
|
|
|
|
#endif /* __V850_CHECKSUM_H__ */
|