PERFORCE change 28679 for review

[Peter Wemm]

http://perforce.freebsd.org/chv.cgi?CH=28679

Change 28679 by peter at peter_daintree on 2003/04/09 19:29:36

	disable AST processing.  THe frame stuff isn't right.
	fix the interrupt enable state after fork.  Hopefully this will
	fix the startup races I've had.

Affected files ...

.. //depot/projects/hammer/sys/x86_64/x86_64/critical.c#6 edit
.. //depot/projects/hammer/sys/x86_64/x86_64/exception.s#18 edit

Differences ...

==== //depot/projects/hammer/sys/x86_64/x86_64/critical.c#6 (text+ko) ====

@@ -28,7 +28,7 @@
 
 	td = curthread;
 	td->td_critnest = 1;
-	td->td_md.md_savecrit = read_rflags() & PSL_I;
+	td->td_md.md_savecrit = read_rflags() | PSL_I;
 }
 
 /*

==== //depot/projects/hammer/sys/x86_64/x86_64/exception.s#18 (text+ko) ====

@@ -195,9 +195,6 @@
 	movq	%r12, %rdi		/* function */
 	movq	%rbx, %rsi		/* arg1 */
 	movq	%rsp, %rdx		/* trapframe pointer */
-	movq	PCPU(CURTHREAD),%rbx	/* setup critnest */
-	movl	$1,TD_CRITNEST(%rbx)
-	sti				/* enable interrupts */
 	call	fork_exit
 	MEXITCOUNT
 	jmp	doreti			/* Handle any ASTs */
@@ -227,6 +224,7 @@
 	/*
 	 * Check if ASTs can be handled now.
 	 */
+#if 0
 	testb	$SEL_RPL_MASK,TF_CS(%rsp) /* are we returning to user mode? */
 	jz	doreti_exit		/* can't handle ASTs now if not */
 
@@ -253,6 +251,7 @@
 	 *	registers.  The fault is handled in trap.c.
 	 */
 doreti_exit:
+#endif
 	MEXITCOUNT
 
 	popq	%r15