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- /*
- * Copyright (C) 2010 Tobias Klauser <[email protected]>
- * Copyright (C) 2004 Microtronix Datacom Ltd.
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- */
- #ifndef _ASM_NIOS_CHECKSUM_H
- #define _ASM_NIOS_CHECKSUM_H
- /* Take these from lib/checksum.c */
- extern __wsum csum_partial(const void *buff, int len, __wsum sum);
- extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
- extern __sum16 ip_compute_csum(const void *buff, int len);
- /*
- * Fold a partial checksum
- */
- static inline __sum16 csum_fold(__wsum sum)
- {
- __asm__ __volatile__(
- "add %0, %1, %0\n"
- "cmpltu r8, %0, %1\n"
- "srli %0, %0, 16\n"
- "add %0, %0, r8\n"
- "nor %0, %0, %0\n"
- : "=r" (sum)
- : "r" (sum << 16), "0" (sum)
- : "r8");
- return (__force __sum16) sum;
- }
- /*
- * computes the checksum of the TCP/UDP pseudo-header
- * returns a 16-bit checksum, already complemented
- */
- #define csum_tcpudp_nofold csum_tcpudp_nofold
- static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
- __u32 len, __u8 proto,
- __wsum sum)
- {
- __asm__ __volatile__(
- "add %0, %1, %0\n"
- "cmpltu r8, %0, %1\n"
- "add %0, %0, r8\n" /* add carry */
- "add %0, %2, %0\n"
- "cmpltu r8, %0, %2\n"
- "add %0, %0, r8\n" /* add carry */
- "add %0, %3, %0\n"
- "cmpltu r8, %0, %3\n"
- "add %0, %0, r8\n" /* add carry */
- : "=r" (sum), "=r" (saddr)
- : "r" (daddr), "r" ((len + proto) << 8),
- "0" (sum),
- "1" (saddr)
- : "r8");
- return sum;
- }
- static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
- __u32 len, __u8 proto,
- __wsum sum)
- {
- return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));
- }
- #endif /* _ASM_NIOS_CHECKSUM_H */
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