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| /*
| * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
| * 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 */
|
|
