+++ /dev/null
-/* checksum.h: FRV checksumming
- *
- * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#ifndef _ASM_CHECKSUM_H
-#define _ASM_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);
-
-/*
- * 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 tmp, inc, sum = 0;
-
- asm(" addcc gr0,gr0,gr0,icc0\n" /* clear icc0.C */
- " subi %1,#4,%1 \n"
- "0: \n"
- " ldu.p @(%1,%3),%4 \n"
- " subicc %2,#1,%2,icc1 \n"
- " addxcc.p %4,%0,%0,icc0 \n"
- " bhi icc1,#2,0b \n"
-
- /* fold the 33-bit result into 16-bits */
- " addxcc gr0,%0,%0,icc0 \n"
- " srli %0,#16,%1 \n"
- " sethi #0,%0 \n"
- " add %1,%0,%0 \n"
- " srli %0,#16,%1 \n"
- " add %1,%0,%0 \n"
-
- : "=r" (sum), "=r" (iph), "=r" (ihl), "=r" (inc), "=&r"(tmp)
- : "0" (sum), "1" (iph), "2" (ihl), "3" (4),
- "m"(*(volatile struct { int _[100]; } *)iph)
- : "icc0", "icc1", "memory"
- );
-
- return (__force __sum16)~sum;
-}
-
-/*
- * Fold a partial checksum
- */
-static inline __sum16 csum_fold(__wsum sum)
-{
- unsigned int tmp;
-
- asm(" srli %0,#16,%1 \n"
- " sethi #0,%0 \n"
- " add %1,%0,%0 \n"
- " srli %0,#16,%1 \n"
- " add %1,%0,%0 \n"
- : "=r"(sum), "=&r"(tmp)
- : "0"(sum)
- );
-
- return (__force __sum16)~sum;
-}
-
-/*
- * 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(" addcc %1,%0,%0,icc0 \n"
- " addxcc %2,%0,%0,icc0 \n"
- " addxcc %3,%0,%0,icc0 \n"
- " addxcc gr0,%0,%0,icc0 \n"
- : "=r" (sum)
- : "r" (daddr), "r" (saddr), "r" (len + proto), "0"(sum)
- : "icc0"
- );
- 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)
-{
- unsigned long tmp, tmp2;
-
- asm(" addcc %2,%0,%0,icc0 \n"
-
- /* add up the source addr */
- " ldi @(%3,0),%1 \n"
- " addxcc %1,%0,%0,icc0 \n"
- " ldi @(%3,4),%2 \n"
- " addxcc %2,%0,%0,icc0 \n"
- " ldi @(%3,8),%1 \n"
- " addxcc %1,%0,%0,icc0 \n"
- " ldi @(%3,12),%2 \n"
- " addxcc %2,%0,%0,icc0 \n"
-
- /* add up the dest addr */
- " ldi @(%4,0),%1 \n"
- " addxcc %1,%0,%0,icc0 \n"
- " ldi @(%4,4),%2 \n"
- " addxcc %2,%0,%0,icc0 \n"
- " ldi @(%4,8),%1 \n"
- " addxcc %1,%0,%0,icc0 \n"
- " ldi @(%4,12),%2 \n"
- " addxcc %2,%0,%0,icc0 \n"
-
- /* fold the 33-bit result into 16-bits */
- " addxcc gr0,%0,%0,icc0 \n"
- " srli %0,#16,%1 \n"
- " sethi #0,%0 \n"
- " add %1,%0,%0 \n"
- " srli %0,#16,%1 \n"
- " add %1,%0,%0 \n"
-
- : "=r" (sum), "=&r" (tmp), "=r" (tmp2)
- : "r" (saddr), "r" (daddr), "0" (sum), "2" (len + proto)
- : "icc0"
- );
-
- return (__force __sum16)~sum;
-}
-
-#endif /* _ASM_CHECKSUM_H */
git.openpandora.org / pandora-kernel.git / blobdiff