| #ifndef _ASM_CRIS_ARCH_CHECKSUM_H |
| #define _ASM_CRIS_ARCH_CHECKSUM_H |
| |
| /* |
| * Check values used in TCP/UDP headers. |
| * |
| * The gain of doing this in assembler instead of C, is that C doesn't |
| * generate carry-additions for the 32-bit components of the |
| * checksum. Which means it would be necessary to split all those into |
| * 16-bit components and then add. |
| */ |
| static inline __wsum |
| csum_tcpudp_nofold(__be32 saddr, __be32 daddr, |
| unsigned short len, unsigned short proto, __wsum sum) |
| { |
| __wsum res; |
| |
| __asm__ __volatile__ ("add.d %2, %0\n\t" |
| "addc %3, %0\n\t" |
| "addc %4, %0\n\t" |
| "addc 0, %0\n\t" |
| : "=r" (res) |
| : "0" (sum), "r" (daddr), "r" (saddr), \ |
| "r" ((len + proto) << 8)); |
| |
| return res; |
| } |
| |
| #endif /* _ASM_CRIS_ARCH_CHECKSUM_H */ |