> 
> Currently the code looks like:
> 
> 	pushr	$0x3f
> 	pushl	$1
> 	nop
> 	calls	$1, $*0x12345678
> 	popr	$0x3f
> 	rei
> 
> I'd like to change it to:
> 
> 	pushr	$0x3f			; 2 bytes
> 	.word	0x9f17			; 2 bytes (jmp @l^)
> 	.long	cmnidsptch		; 4 bytes
> 	.long	rtn			; 4 bytes
> 	.long	arg			; 4 bytes
> 
> and then have this common code:
> 
> cmnidsptch:
> 	movl	-(sp),r0
> 	pushl	4(r0)
> 	calls	$1,*(r0)
> 	popr	$0x3f
> 	rei
> 
> While this is slightly longer than the current code, it eliminates
> a lot of foo_cd.cd_dev[unit] lookups and dispatches to the real interrupt
> routine.
> 
This would be a great change! I don't think that one extra added insn
will hurt anyone :-)

But a small look at the code shows that you have some typos there, I think.
The:
	.word   0x9f17 
should probably be
	.word   0x9f16	(jsb @l^)
and the 
	movl    -(sp),r0
should be
	movl	(sp)+,r0


I like this very much. Great idea!

-- Ragge