diff options
| author | David S. Miller <davem@sunset.davemloft.net> | 2006-03-05 16:41:56 -0800 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2006-03-20 01:11:42 -0800 |
| commit | 398d10830843bda7798f71052b54a5341a8ddd53 (patch) | |
| tree | 3c2f7da709f2f5e21fe3e5678276eae2d665735f /arch/sparc64/lib/NGcopy_to_user.S | |
| parent | 30ddbdb03339fc62480ddbff800a44066bb14455 (diff) | |
[SPARC64]: Niagara optimized memcpy() and copy_{to,from}_user().
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc64/lib/NGcopy_to_user.S')
| -rw-r--r-- | arch/sparc64/lib/NGcopy_to_user.S | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/arch/sparc64/lib/NGcopy_to_user.S b/arch/sparc64/lib/NGcopy_to_user.S new file mode 100644 index 000000000000..4a12395b4502 --- /dev/null +++ b/arch/sparc64/lib/NGcopy_to_user.S @@ -0,0 +1,40 @@ +/* NGcopy_to_user.S: Niagara optimized copy to userspace. + * + * Copyright (C) 2006 David S. Miller (davem@davemloft.net) + */ + +#define EX_ST(x) \ +98: x; \ + .section .fixup; \ + .align 4; \ +99: wr %g0, ASI_AIUS, %asi;\ + 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 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) 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 "U3memcpy.S" |