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author | David Woodhouse <dwmw2@infradead.org> | 2007-08-23 10:43:14 +0100 |
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committer | David Woodhouse <dwmw2@infradead.org> | 2007-08-23 10:43:14 +0100 |
commit | ac0c955d5048c2c580fa7166a89133f0fd76c125 (patch) | |
tree | 041ac4fb544c7244a1a0b35c8ceabc142d5645c1 /arch/sparc64/lib/GENcopy_to_user.S | |
parent | 68d09b1b6780415d82160f6b6d88e82bd724e691 (diff) | |
parent | b377fd3982ad957c796758a90e2988401a884241 (diff) | |
download | linux-ac0c955d5048c2c580fa7166a89133f0fd76c125.tar.bz2 |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
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 000000000000..bb3f7084daf9 --- /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" |