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11/17/2022 06:42:16 AM
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Kbuild
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asm-macros.h
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asm-offsets.h
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cache.h
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cacheflush.h
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checksum.h
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cpuinfo.h
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elf.h
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entry.h
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registers.h
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setup.h
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string.h
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syscalls.h
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Editing: checksum.h
Close
/* * 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 __wsum csum_partial_copy(const void *src, void *dst, int len, __wsum sum); extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst, int len, __wsum sum, int *csum_err); #define csum_partial_copy_nocheck(src, dst, len, sum) \ csum_partial_copy((src), (dst), (len), (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 */