Module: xenomai-2.6
Branch: master
Commit: 2cd66b480726b353e9ec06b6ec23341b5c3e946a
URL:
http://git.xenomai.org/?p=xenomai-2.6.git;a=commit;h=2cd66b480726b353e9ec06b6ec23341b5c3e946a
Author: Gilles Chanteperdrix <gilles.chanteperd...@xenomai.org>
Date: Tue Jun 4 07:46:15 2013 +0200
hal/x86: fix kernel-space FPU with old cpus
Only use the "ldmxcsr" instruction on cpus with SSE.
---
include/asm-x86/bits/pod.h | 8 +++++---
1 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/include/asm-x86/bits/pod.h b/include/asm-x86/bits/pod.h
index ca497be..a32575f 100644
--- a/include/asm-x86/bits/pod.h
+++ b/include/asm-x86/bits/pod.h
@@ -209,13 +209,15 @@ static inline void xnarch_init_thread(xnarchtcb_t *tcb,
static inline void xnarch_init_fpu(xnarchtcb_t * tcb)
{
struct task_struct *task = tcb->user_task;
- unsigned long __mxcsr;
/* Initialize the FPU for a task. This must be run on behalf of the
task. */
__asm__ __volatile__("clts; fninit");
- __mxcsr = 0x1f80UL & 0xffbfUL;
- __asm__ __volatile__("ldmxcsr %0"::"m"(__mxcsr));
+ if (cpu_has_xmm) {
+ unsigned long __mxcsr;
+ __mxcsr = 0x1f80UL & 0xffbfUL;
+ __asm__ __volatile__("ldmxcsr %0"::"m"(__mxcsr));
+ }
if (task) {
/* Real-time shadow FPU initialization: tell Linux
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