From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- arch/nios2/include/asm/checksum.h | 70 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 70 insertions(+) create mode 100644 arch/nios2/include/asm/checksum.h (limited to 'arch/nios2/include/asm/checksum.h') diff --git a/arch/nios2/include/asm/checksum.h b/arch/nios2/include/asm/checksum.h new file mode 100644 index 000000000..69004e07a --- /dev/null +++ b/arch/nios2/include/asm/checksum.h @@ -0,0 +1,70 @@ +/* + * Copyright (C) 2010 Tobias Klauser + * 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 */ -- cgit v1.2.3