linux/arch/sparc64/lib/GENcopy_to_user.S
David S. Miller 6c70b6fc7b [SPARC64]: Do not assume sun4v chips have load-twin/store-init support.
Check the cpu type in the OBP device tree before committing to
using the optimized Niagara memcpy and memset implementation.

If we don't recognize the cpu type, use a completely generic
version.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-08-08 17:33:45 -07:00

39 lines
757 B
ArmAsm

/* GENcopy_to_user.S: Generic sparc64 copy to userspace.
*
* Copyright (C) 2007 David S. Miller (davem@davemloft.net)
*/
#define EX_ST(x) \
98: x; \
.section .fixup; \
.align 4; \
99: retl; \
mov 1, %o0; \
.section __ex_table,"a";\
.align 4; \
.word 98b, 99b; \
.text; \
.align 4;
#ifndef ASI_AIUS
#define ASI_AIUS 0x11
#endif
#define FUNC_NAME GENcopy_to_user
#define STORE(type,src,addr) type##a src, [addr] ASI_AIUS
#define EX_RETVAL(x) 0
#ifdef __KERNEL__
/* Writing to %asi is _expensive_ so we hardcode it.
* Reading %asi to check for KERNEL_DS is comparatively
* cheap.
*/
#define PREAMBLE \
rd %asi, %g1; \
cmp %g1, ASI_AIUS; \
bne,pn %icc, memcpy_user_stub; \
nop
#endif
#include "GENmemcpy.S"