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51533b61 MS |
1 | #ifndef _ASM_CRIS_ARCH_CHECKSUM_H |
2 | #define _ASM_CRIS_ARCH_CHECKSUM_H | |
3 | ||
4 | /* | |
5 | * Check values used in TCP/UDP headers. | |
6 | * | |
7 | * The gain of doing this in assembler instead of C, is that C doesn't | |
8 | * generate carry-additions for the 32-bit components of the | |
9 | * checksum. Which means it would be necessary to split all those into | |
10 | * 16-bit components and then add. | |
11 | */ | |
3532010b AV |
12 | static inline __wsum |
13 | csum_tcpudp_nofold(__be32 saddr, __be32 daddr, | |
14 | unsigned short len, unsigned short proto, __wsum sum) | |
51533b61 | 15 | { |
3532010b | 16 | __wsum res; |
51533b61 MS |
17 | |
18 | __asm__ __volatile__ ("add.d %2, %0\n\t" | |
19 | "addc %3, %0\n\t" | |
20 | "addc %4, %0\n\t" | |
21 | "addc 0, %0\n\t" | |
22 | : "=r" (res) | |
23 | : "0" (sum), "r" (daddr), "r" (saddr), \ | |
3532010b | 24 | "r" ((len + proto) << 8)); |
51533b61 MS |
25 | |
26 | return res; | |
27 | } | |
28 | ||
29 | #endif /* _ASM_CRIS_ARCH_CHECKSUM_H */ |