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Patch to set the OSFXSR bit of CR4

Linux-ia64 Robboy, David G 2 participants 2 messages Jul 31, 2001

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Robboy, David G

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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 */
---

Quoted 1 line

#define IA32_CR4 (1 << 9) /* Set OSFXSR to enable streaming

SIMD */

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It is already enabled in 2.4.7 kernel.

Thanks,
Asit

Quoted 32 lines

-----Original Message-----
From: Robboy, David G [mailto:[email protected]]
Sent: Tuesday, July 31, 2001 3:58 PM
To: '[email protected]'
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 */
---

Quoted 1 line

#define IA32_CR4 (1 << 9) /* Set OSFXSR to

enable streaming
SIMD */

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