kernel/git/stable/linux.git/arch/sparc64/lib/NGmemcpy.S, branch master

sparc,sparc64: unify lib/

2008-12-04T17:17:19+00:00

o Renamed files in sparc64 to _64.S when identical to sparc32 files. o iomap.c were equal for sparc32 and sparc64 o adjusted sparc/Makefile now we have only one lib/ Signed-off-by: Sam Ravnborg Signed-off-by: David S. Miller

[SPARC64]: Don't use in/local regs for ldx/stx data in N1 memcpy.

2007-10-02T23:17:17+00:00

It doesn't matter for use in 64-bit objects, but when used in 32-bit environments the top 32-bits of the local and in registers will get chopped off on the next register window spill/restore which leads to difficult to track down and subtle bugs. Signed-off-by: David S. Miller

[SPARC64]: Fix missing load-twin usage in Niagara-1 memcpy.

2007-10-02T08:03:09+00:00

For the case where the source is not aligned modulo 8 we don't use load-twins to suck the data in and this kills performance since normal loads allocate in the L1 cache (unlike load-twin) and thus big memcpys swipe the entire L1 D-cache. We need to allocate a register window to implement this properly, but that actually simplifies a lot of things as a nice side-effect. Signed-off-by: David S. Miller

[SPARC64]: store-init needs trailing membar.

2007-03-19T20:27:33+00:00

The manual says that it is required and we actually have crash reports where loads see stale data due to not having membars here. In one case the networking does: memset(skb, 0, offsetof(struct sk_buff, truesize)); and then some code later checks skb->nohdr for zero, but it's still the value that was there before the memset(). Note that arch/sparc64/lib/xor.S already got this right. Signed-off-by: David S. Miller

[SPARC64]: Fix some Niagara memcpy() bugs.

2006-03-20T09:12:20+00:00

We need to restore the %asi register properly. For the kernel this means get_fs(), for user this means ASI_PNF. Also, NGcopy_to_user.S was including U3memcpy.S instead of NGmemcpy.S, oops :-) Signed-off-by: David S. Miller

[SPARC64]: Niagara optimized memcpy() and copy_{to,from}_user().

2006-03-20T09:11:42+00:00

Signed-off-by: David S. Miller