[linux.git] / include / asm-m68k / checksum.h

#ifndef _M68K_CHECKSUM_H
#define _M68K_CHECKSUM_H

#include <linux/in6.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
 */
__wsum csum_partial(const void *buff, int len, __wsum 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 __wsum csum_partial_copy_from_user(const void __user *src,
						void *dst,
						int len, __wsum sum,
						int *csum_err);

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

/*
 *	This is a version of ip_compute_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;

	__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;
}

/*
 *	Fold a partial checksum
 */

static inline __sum16 csum_fold(__wsum sum)
{
	unsigned int tmp = (__force u32)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" (tmp));
	return (__force __sum16)~sum;
}


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;
}


/*
 * 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));
}

#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));

	return csum_fold(sum);
}

#endif /* _M68K_CHECKSUM_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _M68K_CHECKSUM_H
	2	#define _M68K_CHECKSUM_H
	3
	4	#include <linux/in6.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	*/
2061acaa	18	__wsum csum_partial(const void *buff, int len, __wsum sum);
1da177e4 LT	19
	20	/*
	21	* the same as csum_partial, 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
2061acaa AV	28	extern __wsum csum_partial_copy_from_user(const void __user *src,
	29	void *dst,
	30	int len, __wsum sum,
1da177e4 LT	31	int *csum_err);
1da177e4 LT	32
2061acaa AV	33	extern __wsum csum_partial_copy_nocheck(const void *src,
	34	void *dst, int len,
	35	__wsum sum);
1da177e4 LT	36
	37	/*
	38	* This is a version of ip_compute_csum() optimized for IP headers,
	39	* which always checksum on 4 octet boundaries.
	40	*
	41	*/
2061acaa	42	static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
1da177e4 LT	43	{
	44	unsigned int sum = 0;
	45	unsigned long tmp;
	46
	47	__asm__ ("subqw #1,%2\n"
	48	"1:\t"
	49	"movel %1@+,%3\n\t"
	50	"addxl %3,%0\n\t"
	51	"dbra %2,1b\n\t"
	52	"movel %0,%3\n\t"
	53	"swap %3\n\t"
	54	"addxw %3,%0\n\t"
	55	"clrw %3\n\t"
	56	"addxw %3,%0\n\t"
	57	: "=d" (sum), "=&a" (iph), "=&d" (ihl), "=&d" (tmp)
	58	: "0" (sum), "1" (iph), "2" (ihl)
	59	: "memory");
2061acaa	60	return (__force __sum16)~sum;
1da177e4 LT	61	}
	62
	63	/*
	64	* Fold a partial checksum
	65	*/
	66
2061acaa	67	static inline __sum16 csum_fold(__wsum sum)
1da177e4	68	{
2061acaa	69	unsigned int tmp = (__force u32)sum;
1da177e4 LT	70	__asm__("swap %1\n\t"
	71	"addw %1, %0\n\t"
	72	"clrw %1\n\t"
	73	"addxw %1, %0"
	74	: "=&d" (sum), "=&d" (tmp)
	75	: "0" (sum), "1" (tmp));
2061acaa	76	return (__force __sum16)~sum;
1da177e4 LT	77	}
	78
	79
2061acaa AV	80	static inline __wsum
	81	csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
	82	unsigned short proto, __wsum sum)
1da177e4 LT	83	{
	84	__asm__ ("addl %2,%0\n\t"
	85	"addxl %3,%0\n\t"
	86	"addxl %4,%0\n\t"
	87	"clrl %1\n\t"
	88	"addxl %1,%0"
	89	: "=&d" (sum), "=d" (saddr)
	90	: "g" (daddr), "1" (saddr), "d" (len + proto),
	91	"0" (sum));
	92	return sum;
	93	}
	94
	95
	96	/*
	97	* computes the checksum of the TCP/UDP pseudo-header
	98	* returns a 16-bit checksum, already complemented
	99	*/
2061acaa AV	100	static inline __sum16
	101	csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len,
	102	unsigned short proto, __wsum sum)
1da177e4 LT	103	{
	104	return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
	105	}
	106
	107	/*
	108	* this routine is used for miscellaneous IP-like checksums, mainly
	109	* in icmp.c
	110	*/
	111
2061acaa	112	static inline __sum16 ip_compute_csum(const void *buff, int len)
1da177e4 LT	113	{
	114	return csum_fold (csum_partial(buff, len, 0));
	115	}
	116
	117	#define _HAVE_ARCH_IPV6_CSUM
2061acaa AV	118	static __inline__ __sum16
	119	csum_ipv6_magic(const struct in6_addr saddr, const struct in6_addr daddr,
	120	__u32 len, unsigned short proto, __wsum sum)
1da177e4 LT	121	{
	122	register unsigned long tmp;
	123	__asm__("addl %2@,%0\n\t"
	124	"movel %2@(4),%1\n\t"
	125	"addxl %1,%0\n\t"
	126	"movel %2@(8),%1\n\t"
	127	"addxl %1,%0\n\t"
	128	"movel %2@(12),%1\n\t"
	129	"addxl %1,%0\n\t"
	130	"movel %3@,%1\n\t"
	131	"addxl %1,%0\n\t"
	132	"movel %3@(4),%1\n\t"
	133	"addxl %1,%0\n\t"
	134	"movel %3@(8),%1\n\t"
	135	"addxl %1,%0\n\t"
	136	"movel %3@(12),%1\n\t"
	137	"addxl %1,%0\n\t"
	138	"addxl %4,%0\n\t"
	139	"clrl %1\n\t"
	140	"addxl %1,%0"
	141	: "=&d" (sum), "=&d" (tmp)
	142	: "a" (saddr), "a" (daddr), "d" (len + proto),
	143	"0" (sum));
	144
	145	return csum_fold(sum);
	146	}
	147
	148	#endif /* _M68K_CHECKSUM_H */