[deliverable/linux.git] / include / asm-sparc64 / checksum.h

#ifndef __SPARC64_CHECKSUM_H
#define __SPARC64_CHECKSUM_H

/*  checksum.h:  IP/UDP/TCP checksum routines on the V9.
 *
 *  Copyright(C) 1995 Linus Torvalds
 *  Copyright(C) 1995 Miguel de Icaza
 *  Copyright(C) 1996 David S. Miller
 *  Copyright(C) 1996 Eddie C. Dost
 *  Copyright(C) 1997 Jakub Jelinek
 *
 * derived from:
 *	Alpha checksum c-code
 *      ix86 inline assembly
 *      RFC1071 Computing the Internet Checksum
 */

#include <linux/in6.h>
#include <asm/uaccess.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 __wsum csum_partial(const void * buff, int len, __wsum sum);

/* the same as csum_partial, but copies from user space 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_nocheck(const void *src, void *dst,
					      int len, __wsum sum);

extern long __csum_partial_copy_from_user(const void __user *src,
					  void *dst, int len,
					  __wsum sum);

static inline __wsum
csum_partial_copy_from_user(const void __user *src,
			    void *dst, int len,
			    __wsum sum, int *err)
{
	long ret = __csum_partial_copy_from_user(src, dst, len, sum);
	if (ret < 0)
		*err = -EFAULT;
	return (__force __wsum) ret;
}

/* 
 *	Copy and checksum to user
 */
#define HAVE_CSUM_COPY_USER
extern long __csum_partial_copy_to_user(const void *src,
					void __user *dst, int len,
					  __wsum sum);

static inline __wsum
csum_and_copy_to_user(const void *src,
		      void __user *dst, int len,
		      __wsum sum, int *err)
{
	long ret = __csum_partial_copy_to_user(src, dst, len, sum);
	if (ret < 0)
		*err = -EFAULT;
	return (__force __wsum) ret;
}

/* ihl is always 5 or greater, almost always is 5, and iph is word aligned
 * the majority of the time.
 */
extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);

/* Fold a partial checksum without adding pseudo headers. */
static inline __sum16 csum_fold(__wsum sum)
{
	unsigned int tmp;

	__asm__ __volatile__(
"	addcc		%0, %1, %1\n"
"	srl		%1, 16, %1\n"
"	addc		%1, %%g0, %1\n"
"	xnor		%%g0, %1, %0\n"
	: "=&r" (sum), "=r" (tmp)
	: "0" (sum), "1" ((__force u32)sum<<16)
	: "cc");
	return (__force __sum16)sum;
}

static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
					       unsigned int len,
					       unsigned short proto,
					       __wsum sum)
{
	__asm__ __volatile__(
"	addcc		%1, %0, %0\n"
"	addccc		%2, %0, %0\n"
"	addccc		%3, %0, %0\n"
"	addc		%0, %%g0, %0\n"
	: "=r" (sum), "=r" (saddr)
	: "r" (daddr), "r" (proto + len), "0" (sum), "1" (saddr)
	: "cc");
	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));
}

#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)
{
	__asm__ __volatile__ (
"	addcc		%3, %4, %%g7\n"
"	addccc		%5, %%g7, %%g7\n"
"	lduw		[%2 + 0x0c], %%g2\n"
"	lduw		[%2 + 0x08], %%g3\n"
"	addccc		%%g2, %%g7, %%g7\n"
"	lduw		[%2 + 0x04], %%g2\n"
"	addccc		%%g3, %%g7, %%g7\n"
"	lduw		[%2 + 0x00], %%g3\n"
"	addccc		%%g2, %%g7, %%g7\n"
"	lduw		[%1 + 0x0c], %%g2\n"
"	addccc		%%g3, %%g7, %%g7\n"
"	lduw		[%1 + 0x08], %%g3\n"
"	addccc		%%g2, %%g7, %%g7\n"
"	lduw		[%1 + 0x04], %%g2\n"
"	addccc		%%g3, %%g7, %%g7\n"
"	lduw		[%1 + 0x00], %%g3\n"
"	addccc		%%g2, %%g7, %%g7\n"
"	addccc		%%g3, %%g7, %0\n"
"	addc		0, %0, %0\n"
	: "=&r" (sum)
	: "r" (saddr), "r" (daddr), "r"(htonl(len)),
	  "r"(htonl(proto)), "r"(sum)
	: "g2", "g3", "g7", "cc");

	return csum_fold(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 /* !(__SPARC64_CHECKSUM_H) */
Commit	Line	Data
1da177e4 LT	1	#ifndef __SPARC64_CHECKSUM_H
	2	#define __SPARC64_CHECKSUM_H
	3
	4	/* checksum.h: IP/UDP/TCP checksum routines on the V9.
	5	*
	6	* Copyright(C) 1995 Linus Torvalds
	7	* Copyright(C) 1995 Miguel de Icaza
	8	* Copyright(C) 1996 David S. Miller
	9	* Copyright(C) 1996 Eddie C. Dost
	10	* Copyright(C) 1997 Jakub Jelinek
	11	*
	12	* derived from:
	13	* Alpha checksum c-code
	14	* ix86 inline assembly
	15	* RFC1071 Computing the Internet Checksum
	16	*/
	17
	18	#include <linux/in6.h>
	19	#include <asm/uaccess.h>
	20
	21	/* computes the checksum of a memory block at buff, length len,
	22	* and adds in "sum" (32-bit)
	23	*
	24	* returns a 32-bit number suitable for feeding into itself
	25	* or csum_tcpudp_magic
	26	*
	27	* this function must be called with even lengths, except
	28	* for the last fragment, which may be odd
	29	*
	30	* it's best to have buff aligned on a 32-bit boundary
	31	*/
d5c63936	32	extern __wsum csum_partial(const void * buff, int len, __wsum sum);
1da177e4 LT	33
	34	/* the same as csum_partial, but copies from user space while it
	35	* checksums
	36	*
	37	* here even more important to align src and dst on a 32-bit (or even
	38	* better 64-bit) boundary
	39	*/
d5c63936 AV	40	extern __wsum csum_partial_copy_nocheck(const void src, void dst,
	41	int len, __wsum sum);
	42
	43	extern long __csum_partial_copy_from_user(const void __user *src,
	44	void *dst, int len,
	45	__wsum sum);
	46
	47	static inline __wsum
	48	csum_partial_copy_from_user(const void __user *src,
	49	void *dst, int len,
	50	__wsum sum, int *err)
1da177e4 LT	51	{
	52	long ret = __csum_partial_copy_from_user(src, dst, len, sum);
	53	if (ret < 0)
	54	*err = -EFAULT;
d5c63936	55	return (__force __wsum) ret;
1da177e4 LT	56	}
	57
	58	/*
	59	* Copy and checksum to user
	60	*/
	61	#define HAVE_CSUM_COPY_USER
d5c63936 AV	62	extern long __csum_partial_copy_to_user(const void *src,
	63	void __user *dst, int len,
	64	__wsum sum);
	65
	66	static inline __wsum
	67	csum_and_copy_to_user(const void *src,
	68	void __user *dst, int len,
	69	__wsum sum, int *err)
1da177e4 LT	70	{
	71	long ret = __csum_partial_copy_to_user(src, dst, len, sum);
	72	if (ret < 0)
	73	*err = -EFAULT;
d5c63936	74	return (__force __wsum) ret;
1da177e4 LT	75	}
	76
	77	/* ihl is always 5 or greater, almost always is 5, and iph is word aligned
	78	* the majority of the time.
	79	*/
d5c63936	80	extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
1da177e4 LT	81
1da177e4 LT	82	/* Fold a partial checksum without adding pseudo headers. */
d5c63936	83	static inline __sum16 csum_fold(__wsum sum)
1da177e4 LT	84	{
	85	unsigned int tmp;
	86
	87	__asm__ __volatile__(
	88	" addcc %0, %1, %1\n"
	89	" srl %1, 16, %1\n"
	90	" addc %1, %%g0, %1\n"
	91	" xnor %%g0, %1, %0\n"
	92	: "=&r" (sum), "=r" (tmp)
d5c63936	93	: "0" (sum), "1" ((__force u32)sum<<16)
1da177e4	94	: "cc");
d5c63936	95	return (__force __sum16)sum;
1da177e4 LT	96	}
1da177e4 LT	97
d5c63936	98	static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
1da177e4 LT	99	unsigned int len,
1da177e4 LT	100	unsigned short proto,
d5c63936	101	__wsum sum)
1da177e4 LT	102	{
	103	__asm__ __volatile__(
	104	" addcc %1, %0, %0\n"
	105	" addccc %2, %0, %0\n"
	106	" addccc %3, %0, %0\n"
	107	" addc %0, %%g0, %0\n"
	108	: "=r" (sum), "=r" (saddr)
d5c63936	109	: "r" (daddr), "r" (proto + len), "0" (sum), "1" (saddr)
1da177e4 LT	110	: "cc");
	111	return sum;
	112	}
	113
	114	/*
	115	* computes the checksum of the TCP/UDP pseudo-header
	116	* returns a 16-bit checksum, already complemented
	117	*/
d5c63936	118	static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
1da177e4 LT	119	unsigned short len,
1da177e4 LT	120	unsigned short proto,
d5c63936	121	__wsum sum)
1da177e4 LT	122	{
	123	return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
	124	}
	125
	126	#define _HAVE_ARCH_IPV6_CSUM
	127
d5c63936 AV	128	static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
	129	const struct in6_addr *daddr,
	130	__u32 len, unsigned short proto,
	131	__wsum sum)
1da177e4 LT	132	{
	133	__asm__ __volatile__ (
	134	" addcc %3, %4, %%g7\n"
	135	" addccc %5, %%g7, %%g7\n"
	136	" lduw [%2 + 0x0c], %%g2\n"
	137	" lduw [%2 + 0x08], %%g3\n"
	138	" addccc %%g2, %%g7, %%g7\n"
	139	" lduw [%2 + 0x04], %%g2\n"
	140	" addccc %%g3, %%g7, %%g7\n"
	141	" lduw [%2 + 0x00], %%g3\n"
	142	" addccc %%g2, %%g7, %%g7\n"
	143	" lduw [%1 + 0x0c], %%g2\n"
	144	" addccc %%g3, %%g7, %%g7\n"
	145	" lduw [%1 + 0x08], %%g3\n"
	146	" addccc %%g2, %%g7, %%g7\n"
	147	" lduw [%1 + 0x04], %%g2\n"
	148	" addccc %%g3, %%g7, %%g7\n"
	149	" lduw [%1 + 0x00], %%g3\n"
	150	" addccc %%g2, %%g7, %%g7\n"
	151	" addccc %%g3, %%g7, %0\n"
	152	" addc 0, %0, %0\n"
	153	: "=&r" (sum)
	154	: "r" (saddr), "r" (daddr), "r"(htonl(len)),
	155	"r"(htonl(proto)), "r"(sum)
	156	: "g2", "g3", "g7", "cc");
	157
	158	return csum_fold(sum);
	159	}
	160
	161	/* this routine is used for miscellaneous IP-like checksums, mainly in icmp.c */
d5c63936	162	static inline __sum16 ip_compute_csum(const void *buff, int len)
1da177e4 LT	163	{
	164	return csum_fold(csum_partial(buff, len, 0));
	165	}
	166
	167	#endif /* !(__SPARC64_CHECKSUM_H) */