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

INCLUDED FROM

DEFINITIONS

1. csum_fold
2. csum_tcpudp_nofold

   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         : "0"(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         "0" ((__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 */