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[MIPS] csum_partial and copy in parallel

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Implement optimized asm version of csum_partial_copy_nocheck,
csum_partial_copy_from_user and csum_and_copy_to_user which can do
calculate and copy in parallel, based on memcpy.S.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Atsushi Nemoto
2006-12-13 01:22:06 +09:00
committed by Ralf Baechle
parent 61e84f9987
commit f860c90bd6
5 changed files with 464 additions and 65 deletions
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include/asm-mips/checksum.h
+19 -12
View File
@@ -29,31 +29,38 @@
*/
__wsum csum_partial(const void *buff, int len, __wsum sum);
__wsum __csum_partial_copy_user(const void *src, void *dst,
int len, __wsum sum, int *err_ptr);
/*
* this is a new version of the above that records errors it finds in *errp,
* but continues and zeros the rest of the buffer.
*/
__wsum csum_partial_copy_from_user(const void __user *src,
void *dst, int len,
__wsum sum, int *errp);
static inline
__wsum csum_partial_copy_from_user(const void __user *src, void *dst, int len,
__wsum sum, int *err_ptr)
{
might_sleep();
return __csum_partial_copy_user((__force void *)src, dst,
len, sum, err_ptr);
}
/*
* Copy and checksum to user
*/
#define HAVE_CSUM_COPY_USER
static inline __wsum csum_and_copy_to_user (const void *src, void __user *dst,
int len, __wsum sum,
int *err_ptr)
static inline
__wsum csum_and_copy_to_user(const void *src, void __user *dst, int len,
__wsum sum, int *err_ptr)
{
might_sleep();
sum = csum_partial(src, len, sum);
if (copy_to_user(dst, src, len)) {
if (access_ok(VERIFY_WRITE, dst, len))
return __csum_partial_copy_user(src, (__force void *)dst,
len, sum, err_ptr);
if (len)
*err_ptr = -EFAULT;
return (__force __wsum)-1;
}
return sum;
return (__force __wsum)-1; /* invalid checksum */
}
/*