[net-next-2.6.git] / arch / m68k / include / asm / checksum_no.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
 */

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

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

/*
 *	Fold a partial checksum
 */

static inline __sum16 csum_fold(__wsum sum)
{
	unsigned int tmp = (__force u32)sum;
#ifdef CONFIG_COLDFIRE
	tmp = (tmp & 0xffff) + (tmp >> 16);
	tmp = (tmp & 0xffff) + (tmp >> 16);
	return (__force __sum16)~tmp;
#else
	__asm__("swap %1\n\t"
		"addw %1, %0\n\t"
		"clrw %1\n\t"
		"addxw %1, %0"
		: "=&d" (sum), "=&d" (tmp)
		: "0" (sum), "1" (sum));
	return (__force __sum16)~sum;
#endif
}


/*
 * computes the checksum of the TCP/UDP pseudo-header
 * returns a 16-bit checksum, already complemented
 */

static inline __wsum
csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
		  unsigned short proto, __wsum sum)
{
	__asm__ ("addl  %1,%0\n\t"
		 "addxl %4,%0\n\t"
		 "addxl %5,%0\n\t"
		 "clrl %1\n\t"
		 "addxl %1,%0"
		 : "=&d" (sum), "=&d" (saddr)
		 : "0" (daddr), "1" (saddr), "d" (len + proto),
		   "d"(sum));
	return sum;
}

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
 */

extern __sum16 ip_compute_csum(const void *buff, int len);

#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	*/
59ed05a7	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
59ed05a7 AV	28	__wsum csum_partial_copy_nocheck(const void src, void dst,
59ed05a7 AV	29	int len, __wsum sum);
1da177e4 LT	30
	31
	32	/*
	33	* the same as csum_partial_copy, but copies from user space.
	34	*
	35	* here even more important to align src and dst on a 32-bit (or even
	36	* better 64-bit) boundary
	37	*/
	38
59ed05a7 AV	39	extern __wsum csum_partial_copy_from_user(const void __user *src,
59ed05a7 AV	40	void dst, int len, __wsum sum, int csum_err);
1da177e4	41
59ed05a7	42	__sum16 ip_fast_csum(const void *iph, unsigned int ihl);
1da177e4 LT	43
	44	/*
	45	* Fold a partial checksum
	46	*/
	47
59ed05a7	48	static inline __sum16 csum_fold(__wsum sum)
1da177e4	49	{
59ed05a7	50	unsigned int tmp = (__force u32)sum;
1da177e4	51	#ifdef CONFIG_COLDFIRE
59ed05a7 AV	52	tmp = (tmp & 0xffff) + (tmp >> 16);
	53	tmp = (tmp & 0xffff) + (tmp >> 16);
	54	return (__force __sum16)~tmp;
1da177e4	55	#else
1da177e4 LT	56	__asm__("swap %1\n\t"
	57	"addw %1, %0\n\t"
	58	"clrw %1\n\t"
	59	"addxw %1, %0"
	60	: "=&d" (sum), "=&d" (tmp)
	61	: "0" (sum), "1" (sum));
59ed05a7	62	return (__force __sum16)~sum;
1da177e4	63	#endif
1da177e4 LT	64	}
	65
	66
	67	/*
	68	* computes the checksum of the TCP/UDP pseudo-header
	69	* returns a 16-bit checksum, already complemented
	70	*/
	71
59ed05a7 AV	72	static inline __wsum
	73	csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
	74	unsigned short proto, __wsum sum)
1da177e4 LT	75	{
	76	__asm__ ("addl %1,%0\n\t"
	77	"addxl %4,%0\n\t"
	78	"addxl %5,%0\n\t"
	79	"clrl %1\n\t"
	80	"addxl %1,%0"
	81	: "=&d" (sum), "=&d" (saddr)
	82	: "0" (daddr), "1" (saddr), "d" (len + proto),
	83	"d"(sum));
	84	return sum;
	85	}
	86
59ed05a7 AV	87	static inline __sum16
	88	csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len,
	89	unsigned short proto, __wsum sum)
1da177e4 LT	90	{
	91	return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
	92	}
	93
	94	/*
	95	* this routine is used for miscellaneous IP-like checksums, mainly
	96	* in icmp.c
	97	*/
	98
59ed05a7	99	extern __sum16 ip_compute_csum(const void *buff, int len);
1da177e4 LT	100
1da177e4 LT	101	#define _HAVE_ARCH_IPV6_CSUM
59ed05a7 AV	102	static __inline__ __sum16
	103	csum_ipv6_magic(const struct in6_addr saddr, const struct in6_addr daddr,
	104	__u32 len, unsigned short proto, __wsum sum)
1da177e4 LT	105	{
	106	register unsigned long tmp;
	107	__asm__("addl %2@,%0\n\t"
	108	"movel %2@(4),%1\n\t"
	109	"addxl %1,%0\n\t"
	110	"movel %2@(8),%1\n\t"
	111	"addxl %1,%0\n\t"
	112	"movel %2@(12),%1\n\t"
	113	"addxl %1,%0\n\t"
	114	"movel %3@,%1\n\t"
	115	"addxl %1,%0\n\t"
	116	"movel %3@(4),%1\n\t"
	117	"addxl %1,%0\n\t"
	118	"movel %3@(8),%1\n\t"
	119	"addxl %1,%0\n\t"
	120	"movel %3@(12),%1\n\t"
	121	"addxl %1,%0\n\t"
	122	"addxl %4,%0\n\t"
	123	"clrl %1\n\t"
	124	"addxl %1,%0"
	125	: "=&d" (sum), "=&d" (tmp)
	126	: "a" (saddr), "a" (daddr), "d" (len + proto),
	127	"0" (sum));
	128
	129	return csum_fold(sum);
	130	}
	131
	132	#endif /* _M68K_CHECKSUM_H */