Major update to the way synchronization is done in the kernel. Highlights

include:

* Mutual exclusion is used instead of spl*().  See mutex(9).  (Note: The
  alpha port is still in transition and currently uses both.)

* Per-CPU idle processes.

* Interrupts are run in their own separate kernel threads and can be
  preempted (i386 only).

Partially contributed by:	BSDi (BSD/OS)
Submissions by (at least):	cp, dfr, dillon, grog, jake, jhb, sheldonh

1 files changed, 0 insertions, 57 deletions

diff --git a/sys/i386/isa/icu_ipl.s b/sys/i386/isa/icu_ipl.s
index 3475358..d178d5c 100644
--- a/sys/i386/isa/icu_ipl.s
+++ b/sys/i386/isa/icu_ipl.s
@@ -55,63 +55,6 @@ _imen:	.long	HWI_MASK
 	SUPERALIGN_TEXT
 
 /*
- * Interrupt priority mechanism
- *	-- soft splXX masks with group mechanism (cpl)
- *	-- h/w masks for currently active or unused interrupts (imen)
- *	-- ipending = active interrupts currently masked by cpl
- */
-
-ENTRY(splz)
-	/*
-	 * The caller has restored cpl and checked that (ipending & ~cpl)
-	 * is nonzero.  We have to repeat the check since if there is an
-	 * interrupt while we're looking, _doreti processing for the
-	 * interrupt will handle all the unmasked pending interrupts
-	 * because we restored early.  We're repeating the calculation
-	 * of (ipending & ~cpl) anyway so that the caller doesn't have
-	 * to pass it, so this only costs one "jne".  "bsfl %ecx,%ecx"
-	 * is undefined when %ecx is 0 so we can't rely on the secondary
-	 * btrl tests.
-	 */
-	movl	_cpl,%eax
-splz_next:
-	/*
-	 * We don't need any locking here.  (ipending & ~cpl) cannot grow 
-	 * while we're looking at it - any interrupt will shrink it to 0.
-	 */
-	movl	%eax,%ecx
-	notl	%ecx
-	andl	_ipending,%ecx
-	jne	splz_unpend
-	ret
-
-	ALIGN_TEXT
-splz_unpend:
-	bsfl	%ecx,%ecx
-	btrl	%ecx,_ipending
-	jnc	splz_next
-	cmpl	$NHWI,%ecx
-	jae	splz_swi
-	/*
-	 * We would prefer to call the intr handler directly here but that
-	 * doesn't work for badly behaved handlers that want the interrupt
-	 * frame.  Also, there's a problem determining the unit number.
-	 * We should change the interface so that the unit number is not
-	 * determined at config time.
-	 */
-	jmp	*vec(,%ecx,4)
-
-	ALIGN_TEXT
-splz_swi:
-	pushl	%eax
-	orl	imasks(,%ecx,4),%eax
-	movl	%eax,_cpl
-	call	*_ihandlers(,%ecx,4)
-	popl	%eax
-	movl	%eax,_cpl
-	jmp	splz_next
-
-/*
  * Fake clock interrupt(s) so that they appear to come from our caller instead
  * of from here, so that system profiling works.
  * XXX do this more generally (for all vectors; look up the C entry point).