| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _CRIS_ARCH_CHECKSUM_H |
| 2 | #define _CRIS_ARCH_CHECKSUM_H |
| 3 | |
| 4 | /* Checksum some values used in TCP/UDP headers. |
| 5 | * |
| 6 | * The gain by doing this in asm is that C will not generate carry-additions |
| 7 | * for the 32-bit components of the checksum, so otherwise we would have had |
| 8 | * to split all of those into 16-bit components, then add. |
| 9 | */ |
| 10 | |
| Adrian Bunk | d9b5444 | 2005-11-07 00:58:44 -0800 | [diff] [blame] | 11 | static inline unsigned int |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned short len, |
| 13 | unsigned short proto, unsigned int sum) |
| 14 | { |
| 15 | int res; |
| 16 | __asm__ ("add.d %2, %0\n\t" |
| 17 | "ax\n\t" |
| 18 | "add.d %3, %0\n\t" |
| 19 | "ax\n\t" |
| 20 | "add.d %4, %0\n\t" |
| 21 | "ax\n\t" |
| 22 | "addq 0, %0\n" |
| 23 | : "=r" (res) |
| 24 | : "0" (sum), "r" (daddr), "r" (saddr), "r" ((ntohs(len) << 16) + (proto << 8))); |
| 25 | |
| 26 | return res; |
| 27 | } |
| 28 | |
| 29 | #endif |