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acrn-kernel/arch/sparc64/lib/NGcopy_from_user.S

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[SPARC64]: Niagara optimized memcpy() and copy_{to,from}_user(). Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-06 08:41:56 +08:00
/* NGcopy_from_user.S: Niagara optimized copy from userspace.
*
[SPARC64]: Fix missing load-twin usage in Niagara-1 memcpy. 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 <davem@davemloft.net>
2007-10-02 16:03:09 +08:00
* Copyright (C) 2006, 2007 David S. Miller (davem@davemloft.net)
[SPARC64]: Niagara optimized memcpy() and copy_{to,from}_user(). Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-06 08:41:56 +08:00
*/
#define EX_LD(x) \
98: x; \
.section .fixup; \
.align 4; \
99: wr %g0, ASI_AIUS, %asi;\
[SPARC64]: Fix missing load-twin usage in Niagara-1 memcpy. 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 <davem@davemloft.net>
2007-10-02 16:03:09 +08:00
ret; \
restore %g0, 1, %o0; \
[SPARC64]: Niagara optimized memcpy() and copy_{to,from}_user(). Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-06 08:41:56 +08:00
.section __ex_table,"a";\
.align 4; \
.word 98b, 99b; \
.text; \
.align 4;
#ifndef ASI_AIUS
#define ASI_AIUS 0x11
#endif
#define FUNC_NAME NGcopy_from_user
#define LOAD(type,addr,dest) type##a [addr] ASI_AIUS, dest
#define LOAD_TWIN(addr_reg,dest0,dest1) \
ldda [addr_reg] ASI_BLK_INIT_QUAD_LDD_AIUS, dest0
[SPARC64]: Fix missing load-twin usage in Niagara-1 memcpy. 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 <davem@davemloft.net>
2007-10-02 16:03:09 +08:00
#define EX_RETVAL(x) %g0
[SPARC64]: Niagara optimized memcpy() and copy_{to,from}_user(). Signed-off-by: David S. Miller <davem@davemloft.net>
2006-03-06 08:41:56 +08:00
#ifdef __KERNEL__
#define PREAMBLE \
rd %asi, %g1; \
cmp %g1, ASI_AIUS; \
bne,pn %icc, memcpy_user_stub; \
nop
#endif
#include "NGmemcpy.S"