[linux-2.6-block.git] / include / asm-sh64 / checksum.h

#ifndef __ASM_SH64_CHECKSUM_H
#define __ASM_SH64_CHECKSUM_H

/*
 * 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.
 *
 * include/asm-sh64/checksum.h
 *
 * Copyright (C) 2000, 2001  Paolo Alberelli
 *
 */

#include <asm/registers.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
 */
asmlinkage __wsum csum_partial(const void *buff, int len, __wsum sum);

/*
 *	Note: when you get a NULL pointer exception here this means someone
 *	passed in an incorrect kernel address to one of these functions.
 *
 *	If you use these functions directly please don't forget the
 *	access_ok().
 */


__wsum csum_partial_copy_nocheck(const void *src, void *dst, int len,
				       __wsum sum);

__wsum csum_partial_copy_from_user(const void __user *src, void *dst,
					 int len, __wsum sum, int *err_ptr);

static inline __sum16 csum_fold(__wsum csum)
{
	u32 sum = (__force u32)csum;
        sum = (sum & 0xffff) + (sum >> 16);
        sum = (sum & 0xffff) + (sum >> 16);
        return (__force __sum16)~sum;
}

__sum16 ip_fast_csum(const void *iph, unsigned int ihl);

__wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
				 unsigned short len, unsigned short proto,
				 __wsum sum);

/*
 * 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));
}

/*
 * 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));
}

#endif /* __ASM_SH64_CHECKSUM_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef __ASM_SH64_CHECKSUM_H
	2	#define __ASM_SH64_CHECKSUM_H
	3
	4	/*
	5	* This file is subject to the terms and conditions of the GNU General Public
	6	* License. See the file "COPYING" in the main directory of this archive
	7	* for more details.
	8	*
	9	* include/asm-sh64/checksum.h
	10	*
	11	* Copyright (C) 2000, 2001 Paolo Alberelli
	12	*
	13	*/
	14
	15	#include <asm/registers.h>
	16
	17	/*
	18	* computes the checksum of a memory block at buff, length len,
	19	* and adds in "sum" (32-bit)
	20	*
	21	* returns a 32-bit number suitable for feeding into itself
	22	* or csum_tcpudp_magic
	23	*
	24	* this function must be called with even lengths, except
	25	* for the last fragment, which may be odd
	26	*
	27	* it's best to have buff aligned on a 32-bit boundary
	28	*/
c459dd90	29	asmlinkage __wsum csum_partial(const void *buff, int len, __wsum sum);
1da177e4 LT	30
	31	/*
	32	* Note: when you get a NULL pointer exception here this means someone
	33	* passed in an incorrect kernel address to one of these functions.
	34	*
	35	* If you use these functions directly please don't forget the
e49332bd	36	* access_ok().
1da177e4 LT	37	*/
	38
	39
c459dd90 AV	40	__wsum csum_partial_copy_nocheck(const void src, void dst, int len,
c459dd90 AV	41	__wsum sum);
1da177e4	42
c459dd90 AV	43	__wsum csum_partial_copy_from_user(const void __user src, void dst,
c459dd90 AV	44	int len, __wsum sum, int *err_ptr);
1da177e4	45
c459dd90	46	static inline __sum16 csum_fold(__wsum csum)
1da177e4	47	{
c459dd90	48	u32 sum = (__force u32)csum;
1da177e4 LT	49	sum = (sum & 0xffff) + (sum >> 16);
1da177e4 LT	50	sum = (sum & 0xffff) + (sum >> 16);
c459dd90	51	return (__force __sum16)~sum;
1da177e4 LT	52	}
1da177e4 LT	53
c459dd90	54	__sum16 ip_fast_csum(const void *iph, unsigned int ihl);
1da177e4	55
c459dd90	56	__wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
1da177e4	57	unsigned short len, unsigned short proto,
c459dd90	58	__wsum sum);
1da177e4 LT	59
	60	/*
	61	* computes the checksum of the TCP/UDP pseudo-header
	62	* returns a 16-bit checksum, already complemented
	63	*/
c459dd90	64	static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
1da177e4 LT	65	unsigned short len,
1da177e4 LT	66	unsigned short proto,
c459dd90	67	__wsum sum)
1da177e4 LT	68	{
	69	return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
	70	}
	71
	72	/*
	73	* this routine is used for miscellaneous IP-like checksums, mainly
	74	* in icmp.c
	75	*/
c459dd90	76	static inline __sum16 ip_compute_csum(const void *buff, int len)
1da177e4 LT	77	{
	78	return csum_fold(csum_partial(buff, len, 0));
	79	}
	80
	81	#endif /* __ASM_SH64_CHECKSUM_H */
	82