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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _CRIS_ARCH_CHECKSUM_H #define _CRIS_ARCH_CHECKSUM_H /* Checksum some values used in TCP/UDP headers. * * The gain by doing this in asm is that C will not generate carry-additions * for the 32-bit components of the checksum, so otherwise we would have had * to split all of those into 16-bit components, then add. */ static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len, __u8 proto, __wsum sum) { __wsum res; __asm__ ("add.d %2, %0\n\t" "ax\n\t" "add.d %3, %0\n\t" "ax\n\t" "add.d %4, %0\n\t" "ax\n\t" "addq 0, %0\n" : "=r" (res) : "0" (sum), "r" (daddr), "r" (saddr), "r" ((len + proto) << 8)); return res; } #endif