13  * and adds in "sum" (32-bit), while copying the block to dst.
39 static inline __sum16 csum_fold(__wsum sum)  in csum_fold()  argument
43 	/* swap the two 16-bit halves of sum */  in csum_fold()
44 	__asm__("rlwinm %0,%1,16,0,31" : "=r" (tmp) : "r" (sum));  in csum_fold()
47 	   giving us the correct sum in the upper half. */  in csum_fold()
48 	return (__force __sum16)(~((__force u32)sum + tmp) >> 16);  in csum_fold()
57 					__u8 proto, __wsum sum)  in csum_tcpudp_nofold()  argument
60 	u64 s = (__force u32)sum;  in csum_tcpudp_nofold()
77 	: "=r" (sum)  in csum_tcpudp_nofold()
78 	: "r" (daddr), "r"(saddr), "r"(proto + len), "0"(sum));  in csum_tcpudp_nofold()
79 	return sum;  in csum_tcpudp_nofold()
88 					__u8 proto, __wsum sum)  in csum_tcpudp_magic()  argument
90 	return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));  in csum_tcpudp_magic()
131 	__wsum sum, tmp;  in ip_fast_csum_nofold()  local
139 	    : "=r" (sum), "=r" (tmp), "+b" (ptr)  in ip_fast_csum_nofold()
143 	return sum;  in ip_fast_csum_nofold()
154  * and adds in "sum" (32-bit)
164 __wsum __csum_partial(const void *buff, int len, __wsum sum);
166 static inline __wsum csum_partial(const void *buff, int len, __wsum sum)  in csum_partial()  argument
170 			sum = csum_add(sum, (__force __wsum)*(const u16 *)buff);  in csum_partial()
172 			sum = csum_add(sum, (__force __wsum)*(const u32 *)buff);  in csum_partial()
174 			sum = csum_add(sum, (__force __wsum)  in csum_partial()
177 			sum = csum_add(sum, (__force __wsum)  in csum_partial()
180 			sum = csum_add(sum, (__force __wsum)  in csum_partial()
183 			sum = csum_add(sum, (__force __wsum)  in csum_partial()
186 			sum = csum_add(sum, (__force __wsum)  in csum_partial()
189 			sum = csum_add(sum, (__force __wsum)  in csum_partial()
192 		sum = csum_add(sum, ip_fast_csum_nofold(buff, len >> 2));  in csum_partial()
194 		sum = __csum_partial(buff, len, sum);  in csum_partial()
196 	return sum;  in csum_partial()
211 			__u32 len, __u8 proto, __wsum sum);