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