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authorAtsushi Nemoto <anemo@mba.ocn.ne.jp>2006-12-12 11:22:06 -0500
committerRalf Baechle <ralf@linux-mips.org>2007-01-08 16:41:04 -0500
commitf860c90bd6ce22c6a0a352cc16acc74fba3d628e (patch)
treefee63d3ff954439d19932beeb0109508a0bc899c /include/asm-mips
parent61e84f99877fa8caaf1be86d51d825406e8d8bc1 (diff)
[MIPS] csum_partial and copy in parallel
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>
Diffstat (limited to 'include/asm-mips')
-rw-r--r--include/asm-mips/checksum.h31
1 files changed, 19 insertions, 12 deletions
diff --git a/include/asm-mips/checksum.h b/include/asm-mips/checksum.h
index 9b768c3b96b3..24cdcc6eaab8 100644
--- a/include/asm-mips/checksum.h
+++ b/include/asm-mips/checksum.h
@@ -29,31 +29,38 @@
29 */ 29 */
30__wsum csum_partial(const void *buff, int len, __wsum sum); 30__wsum csum_partial(const void *buff, int len, __wsum sum);
31 31
32__wsum __csum_partial_copy_user(const void *src, void *dst,
33 int len, __wsum sum, int *err_ptr);
34
32/* 35/*
33 * this is a new version of the above that records errors it finds in *errp, 36 * this is a new version of the above that records errors it finds in *errp,
34 * but continues and zeros the rest of the buffer. 37 * but continues and zeros the rest of the buffer.
35 */ 38 */
36__wsum csum_partial_copy_from_user(const void __user *src, 39static inline
37 void *dst, int len, 40__wsum csum_partial_copy_from_user(const void __user *src, void *dst, int len,
38 __wsum sum, int *errp); 41 __wsum sum, int *err_ptr)
42{
43 might_sleep();
44 return __csum_partial_copy_user((__force void *)src, dst,
45 len, sum, err_ptr);
46}
39 47
40/* 48/*
41 * Copy and checksum to user 49 * Copy and checksum to user
42 */ 50 */
43#define HAVE_CSUM_COPY_USER 51#define HAVE_CSUM_COPY_USER
44static inline __wsum csum_and_copy_to_user (const void *src, void __user *dst, 52static inline
45 int len, __wsum sum, 53__wsum csum_and_copy_to_user(const void *src, void __user *dst, int len,
46 int *err_ptr) 54 __wsum sum, int *err_ptr)
47{ 55{
48 might_sleep(); 56 might_sleep();
49 sum = csum_partial(src, len, sum); 57 if (access_ok(VERIFY_WRITE, dst, len))
50 58 return __csum_partial_copy_user(src, (__force void *)dst,
51 if (copy_to_user(dst, src, len)) { 59 len, sum, err_ptr);
60 if (len)
52 *err_ptr = -EFAULT; 61 *err_ptr = -EFAULT;
53 return (__force __wsum)-1;
54 }
55 62
56 return sum; 63 return (__force __wsum)-1; /* invalid checksum */
57} 64}
58 65
59/* 66/*