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Linux/arch/csky/include/asm/checksum.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
  3 
  4 #ifndef __ASM_CSKY_CHECKSUM_H
  5 #define __ASM_CSKY_CHECKSUM_H
  6 
  7 #include <linux/in6.h>
  8 #include <asm/byteorder.h>
  9 
 10 static inline __sum16 csum_fold(__wsum csum)
 11 {
 12         u32 tmp;
 13 
 14         asm volatile(
 15         "mov    %1, %0\n"
 16         "rori   %0, 16\n"
 17         "addu   %0, %1\n"
 18         "lsri   %0, 16\n"
 19         : "=r"(csum), "=r"(tmp)
 20         : ""(csum));
 21 
 22         return (__force __sum16) ~csum;
 23 }
 24 #define csum_fold csum_fold
 25 
 26 static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
 27                 unsigned short len, unsigned short proto, __wsum sum)
 28 {
 29         asm volatile(
 30         "clrc\n"
 31         "addc    %0, %1\n"
 32         "addc    %0, %2\n"
 33         "addc    %0, %3\n"
 34         "inct    %0\n"
 35         : "=r"(sum)
 36         : "r"((__force u32)saddr), "r"((__force u32)daddr),
 37 #ifdef __BIG_ENDIAN
 38         "r"(proto + len),
 39 #else
 40         "r"((proto + len) << 8),
 41 #endif
 42         "" ((__force unsigned long)sum)
 43         : "cc");
 44         return sum;
 45 }
 46 #define csum_tcpudp_nofold csum_tcpudp_nofold
 47 
 48 #include <asm-generic/checksum.h>
 49 
 50 #endif /* __ASM_CSKY_CHECKSUM_H */
 51 

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