diff options
Diffstat (limited to 'kernel/arch/sparc/lib/NGcopy_to_user.S')
| -rw-r--r-- | kernel/arch/sparc/lib/NGcopy_to_user.S | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/kernel/arch/sparc/lib/NGcopy_to_user.S b/kernel/arch/sparc/lib/NGcopy_to_user.S new file mode 100644 index 000000000..ff630dcb2 --- /dev/null +++ b/kernel/arch/sparc/lib/NGcopy_to_user.S @@ -0,0 +1,35 @@ +/* NGcopy_to_user.S: Niagara optimized copy to userspace. + * + * Copyright (C) 2006, 2007 David S. Miller (davem@davemloft.net) + */ + +#define EX_ST(x) \ +98: x; \ + .section __ex_table,"a";\ + .align 4; \ + .word 98b, __ret_one_asi;\ + .text; \ + .align 4; + +#ifndef ASI_AIUS +#define ASI_AIUS 0x11 +#endif + +#define FUNC_NAME NGcopy_to_user +#define STORE(type,src,addr) type##a src, [addr] ASI_AIUS +#define STORE_ASI ASI_BLK_INIT_QUAD_LDD_AIUS +#define EX_RETVAL(x) %g0 + +#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, ___copy_in_user; \ + nop +#endif + +#include "NGmemcpy.S" |