51 lines
1003 B
C
51 lines
1003 B
C
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/* SPDX-License-Identifier: GPL-2.0 */
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#ifndef __ASM_CSKY_CHECKSUM_H
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#define __ASM_CSKY_CHECKSUM_H
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#include <linux/in6.h>
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#include <asm/byteorder.h>
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static inline __sum16 csum_fold(__wsum csum)
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{
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u32 tmp;
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asm volatile(
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"mov %1, %0\n"
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"rori %0, 16\n"
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"addu %0, %1\n"
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"lsri %0, 16\n"
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: "=r"(csum), "=r"(tmp)
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: "0"(csum));
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return (__force __sum16) ~csum;
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}
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#define csum_fold csum_fold
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static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
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unsigned short len, unsigned short proto, __wsum sum)
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{
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asm volatile(
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"clrc\n"
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"addc %0, %1\n"
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"addc %0, %2\n"
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"addc %0, %3\n"
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"inct %0\n"
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: "=r"(sum)
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: "r"((__force u32)saddr), "r"((__force u32)daddr),
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#ifdef __BIG_ENDIAN
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"r"(proto + len),
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#else
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"r"((proto + len) << 8),
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#endif
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"0" ((__force unsigned long)sum)
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: "cc");
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return sum;
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}
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#define csum_tcpudp_nofold csum_tcpudp_nofold
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#include <asm-generic/checksum.h>
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#endif /* __ASM_CSKY_CHECKSUM_H */
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