diff options
| author | David S. Miller <davem@sunset.davemloft.net> | 2007-08-08 17:11:39 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-08-08 17:33:45 -0700 |
| commit | 6c70b6fc7b6fc321636a014082d9e32333da1f80 (patch) | |
| tree | ff0e52bb7ba43b058b7cbb88b952fd268fbe3ad2 /arch/sparc64/lib/GENcopy_to_user.S | |
| parent | 68c9f9fd336dc7e793cecad25f8ac40ccaa7a256 (diff) | |
[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>
Diffstat (limited to 'arch/sparc64/lib/GENcopy_to_user.S')
| -rw-r--r-- | arch/sparc64/lib/GENcopy_to_user.S | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/arch/sparc64/lib/GENcopy_to_user.S b/arch/sparc64/lib/GENcopy_to_user.S new file mode 100644 index 00000000000..bb3f7084daf --- /dev/null +++ b/arch/sparc64/lib/GENcopy_to_user.S @@ -0,0 +1,38 @@ +/* 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" |