arch/csky/include/asm/checksum.h

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