* [Linux-ia64] Patch to set the OSFXSR bit of CR4
@ 2001-07-31 22:57 Robboy, David G
2001-07-31 23:02 ` Mallick, Asit K
0 siblings, 1 reply; 2+ messages in thread
From: Robboy, David G @ 2001-07-31 22:57 UTC (permalink / raw)
To: linux-ia64
Linux should enable the ia32 "streaming SIMD" instructions (the PIII
extensions of MMX). These instructions work on the Itanium processor under
seamless. Currently Linux disables them by clearing the OSFXSR bit of CR4.
Here's the patch for linux R2.4.5.
- David Robboy
include/asm-ia64/ia32.h
373c373
< #define IA32_CR4 0 /* No architectural extensions */
---
> #define IA32_CR4 (1 << 9) /* Set OSFXSR to enable streaming
SIMD */
^ permalink raw reply [flat|nested] 2+ messages in thread
* RE: [Linux-ia64] Patch to set the OSFXSR bit of CR4
2001-07-31 22:57 [Linux-ia64] Patch to set the OSFXSR bit of CR4 Robboy, David G
@ 2001-07-31 23:02 ` Mallick, Asit K
0 siblings, 0 replies; 2+ messages in thread
From: Mallick, Asit K @ 2001-07-31 23:02 UTC (permalink / raw)
To: linux-ia64
It is already enabled in 2.4.7 kernel.
Thanks,
Asit
> -----Original Message-----
> From: Robboy, David G [mailto:david.g.robboy@intel.com]
> Sent: Tuesday, July 31, 2001 3:58 PM
> To: 'linux-ia64@linuxia64.org'
> Subject: [Linux-ia64] Patch to set the OSFXSR bit of CR4
>
>
> Linux should enable the ia32 "streaming SIMD" instructions (the PIII
> extensions of MMX). These instructions work on the Itanium
> processor under
> seamless. Currently Linux disables them by clearing the
> OSFXSR bit of CR4.
>
> Here's the patch for linux R2.4.5.
>
> - David Robboy
>
> include/asm-ia64/ia32.h
> 373c373
> < #define IA32_CR4 0 /* No architectural
> extensions */
> ---
> > #define IA32_CR4 (1 << 9) /* Set OSFXSR to
> enable streaming
> SIMD */
>
>
> _______________________________________________
> Linux-IA64 mailing list
> Linux-IA64@linuxia64.org
> http://lists.linuxia64.org/lists/listinfo/linux-ia64
>
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