diff options
| author | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-08-18 09:34:28 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-08-18 09:34:28 -0700 |
| commit | 5bc705e9fe774be9bb87584644c1f6752ee5ea7e (patch) | |
| tree | 5bcab227cc2008df6cfb17533be0a69ffd21e981 /arch/sparc64/lib/NG2copy_to_user.S | |
| parent | 605a494e4df0b2dabdebcdfee99536b0f6a22adc (diff) | |
| parent | 405849610fd96b4f34cd1875c4c033228fea6c0f (diff) | |
| download | talos-op-linux-5bc705e9fe774be9bb87584644c1f6752ee5ea7e.tar.gz talos-op-linux-5bc705e9fe774be9bb87584644c1f6752ee5ea7e.zip | |
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6
* 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6:
[MATH-EMU]: Fix underflow exception reporting.
[SPARC64]: Create a HWCAP_SPARC_N2 and report it to userspace on Niagara-2.
[SPARC64]: SMP trampoline needs to avoid %tick_cmpr on sun4v too.
[SPARC64]: Do not touch %tick_cmpr on sun4v cpus.
[SPARC64]: Niagara-2 optimized copies.
[SPARC64]: Allow userspace to get at the machine description.
[SPARC32]: Remove superfluous 'kernel_end' alignment on sun4c.
[SPARC32]: Fix bogus ramdisk image location check.
[SPARC32]: Remove iommu from struct sbus_bus and use archdata like sparc64.
Diffstat (limited to 'arch/sparc64/lib/NG2copy_to_user.S')
| -rw-r--r-- | arch/sparc64/lib/NG2copy_to_user.S | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/arch/sparc64/lib/NG2copy_to_user.S b/arch/sparc64/lib/NG2copy_to_user.S new file mode 100644 index 000000000000..4bd4093acbbd --- /dev/null +++ b/arch/sparc64/lib/NG2copy_to_user.S @@ -0,0 +1,49 @@ +/* NG2copy_to_user.S: Niagara-2 optimized copy to userspace. + * + * Copyright (C) 2007 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 + +#ifndef ASI_BLK_AIUS_4V +#define ASI_BLK_AIUS_4V 0x17 +#endif + +#ifndef ASI_BLK_INIT_QUAD_LDD_AIUS +#define ASI_BLK_INIT_QUAD_LDD_AIUS 0x23 +#endif + +#define FUNC_NAME NG2copy_to_user +#define STORE(type,src,addr) type##a src, [addr] ASI_AIUS +#define STORE_ASI ASI_BLK_INIT_QUAD_LDD_AIUS +#define STORE_BLK(src,addr) stda src, [addr] ASI_BLK_AIUS_4V +#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 "NG2memcpy.S" |
