arch/sparc/include/asm/checksum_32.h - maze/linux - Git at Google

 #ifndef __SPARC_CHECKSUM_H
 #define __SPARC_CHECKSUM_H

 /*  checksum.h:  IP/UDP/TCP checksum routines on the Sparc.
  *
  *  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 fs: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 int __csum_partial_copy_sparc_generic (const unsigned char *, unsigned char *);

 static inline __wsum
 csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum)
 {
 	register unsigned int ret asm("o0") = (unsigned int)src;
 	register char *d asm("o1") = dst;
 	register int l asm("g1") = len;

 	__asm__ __volatile__ (
 		"call __csum_partial_copy_sparc_generic\n\t"
 		" mov %6, %%g7\n"
 	: "=&r" (ret), "=&r" (d), "=&r" (l)
 	: "0" (ret), "1" (d), "2" (l), "r" (sum)
 	: "o2", "o3", "o4", "o5", "o7",
 	  "g2", "g3", "g4", "g5", "g7",
 	  "memory", "cc");
 	return (__force __wsum)ret;
 }

 static inline __wsum
 csum_partial_copy_from_user(const void __user *src, void *dst, int len,
 			    __wsum sum, int *err)
   {
 	register unsigned long ret asm("o0") = (unsigned long)src;
 	register char *d asm("o1") = dst;
 	register int l asm("g1") = len;
 	register __wsum s asm("g7") = sum;

 	__asm__ __volatile__ (
 	".section __ex_table,#alloc\n\t"
 	".align 4\n\t"
 	".word 1f,2\n\t"
 	".previous\n"
 	"1:\n\t"
 	"call __csum_partial_copy_sparc_generic\n\t"
 	" st %8, [%%sp + 64]\n"
 	: "=&r" (ret), "=&r" (d), "=&r" (l), "=&r" (s)
 	: "0" (ret), "1" (d), "2" (l), "3" (s), "r" (err)
 	: "o2", "o3", "o4", "o5", "o7", "g2", "g3", "g4", "g5",
 	  "cc", "memory");
 	return (__force __wsum)ret;
 }

 static inline __wsum
 csum_partial_copy_to_user(const void *src, void __user *dst, int len,
 			  __wsum sum, int *err)
 {
 	if (!access_ok (VERIFY_WRITE, dst, len)) {
 		*err = -EFAULT;
 		return sum;
 	} else {
 		register unsigned long ret asm("o0") = (unsigned long)src;
 		register char __user *d asm("o1") = dst;
 		register int l asm("g1") = len;
 		register __wsum s asm("g7") = sum;

 		__asm__ __volatile__ (
 		".section __ex_table,#alloc\n\t"
 		".align 4\n\t"
 		".word 1f,1\n\t"
 		".previous\n"
 		"1:\n\t"
 		"call __csum_partial_copy_sparc_generic\n\t"
 		" st %8, [%%sp + 64]\n"
 		: "=&r" (ret), "=&r" (d), "=&r" (l), "=&r" (s)
 		: "0" (ret), "1" (d), "2" (l), "3" (s), "r" (err)
 		: "o2", "o3", "o4", "o5", "o7",
 		  "g2", "g3", "g4", "g5",
 		  "cc", "memory");
 		return (__force __wsum)ret;
 	}
 }

 #define HAVE_CSUM_COPY_USER
 #define csum_and_copy_to_user csum_partial_copy_to_user

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

 	/* Note: We must read %2 before we touch %0 for the first time,
 	 *       because GCC can legitimately use the same register for
 	 *       both operands.
 	 */
 	__asm__ __volatile__("sub\t%2, 4, %%g4\n\t"
 			     "ld\t[%1 + 0x00], %0\n\t"
 			     "ld\t[%1 + 0x04], %%g2\n\t"
 			     "ld\t[%1 + 0x08], %%g3\n\t"
 			     "addcc\t%%g2, %0, %0\n\t"
 			     "addxcc\t%%g3, %0, %0\n\t"
 			     "ld\t[%1 + 0x0c], %%g2\n\t"
 			     "ld\t[%1 + 0x10], %%g3\n\t"
 			     "addxcc\t%%g2, %0, %0\n\t"
 			     "addx\t%0, %%g0, %0\n"
 			     "1:\taddcc\t%%g3, %0, %0\n\t"
 			     "add\t%1, 4, %1\n\t"
 			     "addxcc\t%0, %%g0, %0\n\t"
 			     "subcc\t%%g4, 1, %%g4\n\t"
 			     "be,a\t2f\n\t"
 			     "sll\t%0, 16, %%g2\n\t"
 			     "b\t1b\n\t"
 			     "ld\t[%1 + 0x10], %%g3\n"
 			     "2:\taddcc\t%0, %%g2, %%g2\n\t"
 			     "srl\t%%g2, 16, %0\n\t"
 			     "addx\t%0, %%g0, %0\n\t"
 			     "xnor\t%%g0, %0, %0"
 			     : "=r" (sum), "=&r" (iph)
 			     : "r" (ihl), "1" (iph)
 			     : "g2", "g3", "g4", "cc", "memory");
 	return sum;
 }

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

 	__asm__ __volatile__("addcc\t%0, %1, %1\n\t"
 			     "srl\t%1, 16, %1\n\t"
 			     "addx\t%1, %%g0, %1\n\t"
 			     "xnor\t%%g0, %1, %0"
 			     : "=&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 short len,
 					       unsigned short proto,
 					       __wsum sum)
 {
 	__asm__ __volatile__("addcc\t%1, %0, %0\n\t"
 			     "addxcc\t%2, %0, %0\n\t"
 			     "addxcc\t%3, %0, %0\n\t"
 			     "addx\t%0, %%g0, %0\n\t"
 			     : "=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, %%g4\n\t"
 		"addxcc	%5, %%g4, %%g4\n\t"
 		"ld	[%2 + 0x0c], %%g2\n\t"
 		"ld	[%2 + 0x08], %%g3\n\t"
 		"addxcc	%%g2, %%g4, %%g4\n\t"
 		"ld	[%2 + 0x04], %%g2\n\t"
 		"addxcc	%%g3, %%g4, %%g4\n\t"
 		"ld	[%2 + 0x00], %%g3\n\t"
 		"addxcc	%%g2, %%g4, %%g4\n\t"
 		"ld	[%1 + 0x0c], %%g2\n\t"
 		"addxcc	%%g3, %%g4, %%g4\n\t"
 		"ld	[%1 + 0x08], %%g3\n\t"
 		"addxcc	%%g2, %%g4, %%g4\n\t"
 		"ld	[%1 + 0x04], %%g2\n\t"
 		"addxcc	%%g3, %%g4, %%g4\n\t"
 		"ld	[%1 + 0x00], %%g3\n\t"
 		"addxcc	%%g2, %%g4, %%g4\n\t"
 		"addxcc	%%g3, %%g4, %0\n\t"
 		"addx	0, %0, %0\n"
 		: "=&r" (sum)
 		: "r" (saddr), "r" (daddr),
 		  "r"(htonl(len)), "r"(htonl(proto)), "r"(sum)
 		: "g2", "g3", "g4", "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 /* !(__SPARC_CHECKSUM_H) */
	#ifndef __SPARC_CHECKSUM_H
	#define __SPARC_CHECKSUM_H

	/* checksum.h: IP/UDP/TCP checksum routines on the Sparc.
	*
	* 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 fs: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 int __csum_partial_copy_sparc_generic (const unsigned char , unsigned char );

	static inline __wsum
	csum_partial_copy_nocheck(const void src, void dst, int len, __wsum sum)
	{
	register unsigned int ret asm("o0") = (unsigned int)src;
	register char *d asm("o1") = dst;
	register int l asm("g1") = len;

	__asm__ __volatile__ (
	"call __csum_partial_copy_sparc_generic\n\t"
	" mov %6, %%g7\n"
	: "=&r" (ret), "=&r" (d), "=&r" (l)
	: "0" (ret), "1" (d), "2" (l), "r" (sum)
	: "o2", "o3", "o4", "o5", "o7",
	"g2", "g3", "g4", "g5", "g7",
	"memory", "cc");
	return (__force __wsum)ret;
	}

	static inline __wsum
	csum_partial_copy_from_user(const void __user src, void dst, int len,
	__wsum sum, int *err)
	{
	register unsigned long ret asm("o0") = (unsigned long)src;
	register char *d asm("o1") = dst;
	register int l asm("g1") = len;
	register __wsum s asm("g7") = sum;

	__asm__ __volatile__ (
	".section __ex_table,#alloc\n\t"
	".align 4\n\t"
	".word 1f,2\n\t"
	".previous\n"
	"1:\n\t"
	"call __csum_partial_copy_sparc_generic\n\t"
	" st %8, [%%sp + 64]\n"
	: "=&r" (ret), "=&r" (d), "=&r" (l), "=&r" (s)
	: "0" (ret), "1" (d), "2" (l), "3" (s), "r" (err)
	: "o2", "o3", "o4", "o5", "o7", "g2", "g3", "g4", "g5",
	"cc", "memory");
	return (__force __wsum)ret;
	}

	static inline __wsum
	csum_partial_copy_to_user(const void src, void __user dst, int len,
	__wsum sum, int *err)
	{
	if (!access_ok (VERIFY_WRITE, dst, len)) {
	*err = -EFAULT;
	return sum;
	} else {
	register unsigned long ret asm("o0") = (unsigned long)src;
	register char __user *d asm("o1") = dst;
	register int l asm("g1") = len;
	register __wsum s asm("g7") = sum;

	__asm__ __volatile__ (
	".section __ex_table,#alloc\n\t"
	".align 4\n\t"
	".word 1f,1\n\t"
	".previous\n"
	"1:\n\t"
	"call __csum_partial_copy_sparc_generic\n\t"
	" st %8, [%%sp + 64]\n"
	: "=&r" (ret), "=&r" (d), "=&r" (l), "=&r" (s)
	: "0" (ret), "1" (d), "2" (l), "3" (s), "r" (err)
	: "o2", "o3", "o4", "o5", "o7",
	"g2", "g3", "g4", "g5",
	"cc", "memory");
	return (__force __wsum)ret;
	}
	}

	#define HAVE_CSUM_COPY_USER
	#define csum_and_copy_to_user csum_partial_copy_to_user

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

	/* Note: We must read %2 before we touch %0 for the first time,
	* because GCC can legitimately use the same register for
	* both operands.
	*/
	__asm__ __volatile__("sub\t%2, 4, %%g4\n\t"
	"ld\t[%1 + 0x00], %0\n\t"
	"ld\t[%1 + 0x04], %%g2\n\t"
	"ld\t[%1 + 0x08], %%g3\n\t"
	"addcc\t%%g2, %0, %0\n\t"
	"addxcc\t%%g3, %0, %0\n\t"
	"ld\t[%1 + 0x0c], %%g2\n\t"
	"ld\t[%1 + 0x10], %%g3\n\t"
	"addxcc\t%%g2, %0, %0\n\t"
	"addx\t%0, %%g0, %0\n"
	"1:\taddcc\t%%g3, %0, %0\n\t"
	"add\t%1, 4, %1\n\t"
	"addxcc\t%0, %%g0, %0\n\t"
	"subcc\t%%g4, 1, %%g4\n\t"
	"be,a\t2f\n\t"
	"sll\t%0, 16, %%g2\n\t"
	"b\t1b\n\t"
	"ld\t[%1 + 0x10], %%g3\n"
	"2:\taddcc\t%0, %%g2, %%g2\n\t"
	"srl\t%%g2, 16, %0\n\t"
	"addx\t%0, %%g0, %0\n\t"
	"xnor\t%%g0, %0, %0"
	: "=r" (sum), "=&r" (iph)
	: "r" (ihl), "1" (iph)
	: "g2", "g3", "g4", "cc", "memory");
	return sum;
	}

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

	__asm__ __volatile__("addcc\t%0, %1, %1\n\t"
	"srl\t%1, 16, %1\n\t"
	"addx\t%1, %%g0, %1\n\t"
	"xnor\t%%g0, %1, %0"
	: "=&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 short len,
	unsigned short proto,
	__wsum sum)
	{
	__asm__ __volatile__("addcc\t%1, %0, %0\n\t"
	"addxcc\t%2, %0, %0\n\t"
	"addxcc\t%3, %0, %0\n\t"
	"addx\t%0, %%g0, %0\n\t"
	: "=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, %%g4\n\t"
	"addxcc %5, %%g4, %%g4\n\t"
	"ld [%2 + 0x0c], %%g2\n\t"
	"ld [%2 + 0x08], %%g3\n\t"
	"addxcc %%g2, %%g4, %%g4\n\t"
	"ld [%2 + 0x04], %%g2\n\t"
	"addxcc %%g3, %%g4, %%g4\n\t"
	"ld [%2 + 0x00], %%g3\n\t"
	"addxcc %%g2, %%g4, %%g4\n\t"
	"ld [%1 + 0x0c], %%g2\n\t"
	"addxcc %%g3, %%g4, %%g4\n\t"
	"ld [%1 + 0x08], %%g3\n\t"
	"addxcc %%g2, %%g4, %%g4\n\t"
	"ld [%1 + 0x04], %%g2\n\t"
	"addxcc %%g3, %%g4, %%g4\n\t"
	"ld [%1 + 0x00], %%g3\n\t"
	"addxcc %%g2, %%g4, %%g4\n\t"
	"addxcc %%g3, %%g4, %0\n\t"
	"addx 0, %0, %0\n"
	: "=&r" (sum)
	: "r" (saddr), "r" (daddr),
	"r"(htonl(len)), "r"(htonl(proto)), "r"(sum)
	: "g2", "g3", "g4", "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 /* !(__SPARC_CHECKSUM_H) */