1 // SPDX-License-Identifier: GPL-2.0
3  * csum_partial_copy - do IP checksumming and copy
7  *	Rick Gorton	<rick.gorton@alpha-processor.com>
9  * Don't look at this too closely - you'll go mad. The things
26 __asm__ __volatile__("extql %1,%2,%0":"=r" (z):"r" (x),"r" (y))
29 __asm__ __volatile__("extqh %1,%2,%0":"=r" (z):"r" (x),"r" (y))
32 __asm__ __volatile__("mskql %1,%2,%0":"=r" (z):"r" (x),"r" (y))
35 __asm__ __volatile__("mskqh %1,%2,%0":"=r" (z):"r" (x),"r" (y))
38 __asm__ __volatile__("insql %1,%2,%0":"=r" (z):"r" (x),"r" (y))
41 __asm__ __volatile__("insqh %1,%2,%0":"=r" (z):"r" (x),"r" (y))
47 	"1:	"#insn" %0,%2\n"			\
48 	"2:\n"						\
49 	EXC(1b,2b,%0,%1)				\
62 		unsigned int	ui[2];  in from64to16()
72 			+ (unsigned long) tmp_v.us[2];  in from64to16()
74 	/* Similarly, out_v.us[2] is always zero for the final add.  */  in from64to16()
84 csum_partial_cfu_aligned(const unsigned long __user *src, unsigned long *dst,  in csum_partial_cfu_aligned()  argument
92 		if (__get_word(ldq, word, src))  in csum_partial_cfu_aligned()
95 		src++;  in csum_partial_cfu_aligned()
97 		len -= 8;  in csum_partial_cfu_aligned()
106 		if (__get_word(ldq, word, src))  in csum_partial_cfu_aligned()
124 csum_partial_cfu_dest_aligned(const unsigned long __user *src,  in csum_partial_cfu_dest_aligned()  argument
131 	unsigned long lastsrc = 7+len+(unsigned long)src;  in csum_partial_cfu_dest_aligned()
134 	if (__get_word(ldq_u, first,src))  in csum_partial_cfu_dest_aligned()
140 		if (__get_word(ldq_u, second, src+1))  in csum_partial_cfu_dest_aligned()
143 		len -= 8;  in csum_partial_cfu_dest_aligned()
144 		src++;  in csum_partial_cfu_dest_aligned()
179 csum_partial_cfu_src_aligned(const unsigned long __user *src,  in csum_partial_cfu_src_aligned()  argument
192 		if (__get_word(ldq, word, src))  in csum_partial_cfu_src_aligned()
194 		len -= 8;  in csum_partial_cfu_src_aligned()
198 		src++;  in csum_partial_cfu_src_aligned()
207 		if (__get_word(ldq, word, src))  in csum_partial_cfu_src_aligned()
210 		len -= 8;  in csum_partial_cfu_src_aligned()
233  * This is so totally un-fun that it's frightening. Don't
237 csum_partial_cfu_unaligned(const unsigned long __user * src,  in csum_partial_cfu_unaligned()  argument
247 	if (__get_word(ldq_u, first, src))  in csum_partial_cfu_unaligned()
249 	lastsrc = 7+len+(unsigned long)src;  in csum_partial_cfu_unaligned()
255 		if (__get_word(ldq_u, second, src+1))  in csum_partial_cfu_unaligned()
259 		len -= 8;  in csum_partial_cfu_unaligned()
261 		src++;  in csum_partial_cfu_unaligned()
283 		mskql(word, len-doff, word);  in csum_partial_cfu_unaligned()
305 		mskql(word, len-doff, word);  in csum_partial_cfu_unaligned()
316 static __wsum __csum_and_copy(const void __user *src, void *dst, int len)  in __csum_and_copy()  argument
318 	unsigned long soff = 7 & (unsigned long) src;  in __csum_and_copy()
325 				(const unsigned long __user *) src,  in __csum_and_copy()
326 				(unsigned long *) dst, len-8);  in __csum_and_copy()
329 				(const unsigned long __user *) src,  in __csum_and_copy()
331 				soff, len-8);  in __csum_and_copy()
337 				(const unsigned long __user *) src,  in __csum_and_copy()
339 				doff, len-8, partial_dest);  in __csum_and_copy()
342 				(const unsigned long __user *) src,  in __csum_and_copy()
344 				soff, doff, len-8, partial_dest);  in __csum_and_copy()
350 csum_and_copy_from_user(const void __user *src, void *dst, int len)  in csum_and_copy_from_user()  argument
352 	if (!access_ok(src, len))  in csum_and_copy_from_user()
354 	return __csum_and_copy(src, dst, len);  in csum_and_copy_from_user()
358 csum_partial_copy_nocheck(const void *src, void *dst, int len)  in csum_partial_copy_nocheck()  argument
360 	return __csum_and_copy((__force const void __user *)src,  in csum_partial_copy_nocheck()