/* SPDX-License-Identifier: GPL-2.0 */

#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 */