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- Saved the fpu state before the actual thread switching occurs (only for smp machines).

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svn path=/trunk/; revision=11832
This commit is contained in:
Hartmut Birr 2004-11-27 16:19:22 +00:00
parent 2b6de7c143
commit b51c0305db
1 changed files with 24 additions and 19 deletions
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43
reactos/ntoskrnl/ke/i386/tskswitch.S
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@ -59,6 +59,30 @@ _Ki386ContextSwitch:
* This is a critical section for this processor. * This is a critical section for this processor.
*/ */
cli cli
#ifdef MP
/*
* Get the pointer to the old thread.
*/
movl 12(%ebp), %ebx
/*
* Save FPU state if the thread has used it.
*/
movl $0, %fs:KPCR_NPX_THREAD
testb $NPX_STATE_DIRTY, KTHREAD_NPX_STATE(%ebx)
jz 3f
movl KTHREAD_INITIAL_STACK(%ebx), %eax
cmpl $0, _FxsrSupport
je 1f
fxsave -SIZEOF_FX_SAVE_AREA(%eax)
jmp 2f
1:
fnsave -SIZEOF_FX_SAVE_AREA(%eax)
2:
movb $NPX_STATE_VALID, KTHREAD_NPX_STATE(%ebx)
3:
#endif /* MP */
/* /*
* Get the pointer to the new thread. * Get the pointer to the new thread.
@ -111,25 +135,6 @@ _Ki386ContextSwitch:
*/ */
movl 12(%ebp), %ebx movl 12(%ebp), %ebx
#ifdef MP
/*
* Save FPU state if the thread has used it.
*/
movl $0, %fs:KPCR_NPX_THREAD
testb $NPX_STATE_DIRTY, KTHREAD_NPX_STATE(%ebx)
jz 3f
movl KTHREAD_INITIAL_STACK(%ebx), %eax
cmpl $0, _FxsrSupport
je 1f
fxsave -SIZEOF_FX_SAVE_AREA(%eax)
jmp 2f
1:
fnsave -SIZEOF_FX_SAVE_AREA(%eax)
2:
movb $NPX_STATE_VALID, KTHREAD_NPX_STATE(%ebx)
3:
#endif /* MP */
/* /*
* FIXME: Save debugging state. * FIXME: Save debugging state.
*/ */