Add a bus_dma_tag_t for DVMA usage, suitable for use for devices not sitting

behind a sun4m iommu.

Move the existing dvma routines from vm_machdep.c to this new dvma.c; this
allows for a few declarations to be removed from public headers.

Extend the device attachment arguments (struct confargs) to pass a
bus_dma_tag_t. mainbus receives the dvma bus_dma_tag_t, and devices pass the
tag unchanged to their children, except for iommu(4) which replaces it with
its own.

Change the few sun4m-only drivers to pick the bus_dma_tag_t from confargs
rather than assume iommu; this allows qlw(4) to attach and work on sun4c.

ok kettenis@

2 files changed, 5 insertions, 2 deletions

diff --git a/sys/arch/sparc/conf/SUN4C b/sys/arch/sparc/conf/SUN4C
index 6c48b8e4f14..7a788fba7bc 100644
--- a/sys/arch/sparc/conf/SUN4C
+++ b/sys/arch/sparc/conf/SUN4C
@@ -1,4 +1,4 @@
-#	$OpenBSD: SUN4C,v 1.68 2014/10/25 18:21:01 miod Exp $
+#	$OpenBSD: SUN4C,v 1.69 2015/03/30 20:30:20 miod Exp $
 #	$NetBSD: GENERIC,v 1.48 1997/08/23 19:19:01 mjacob Exp $
 
 # Machine architecture; required by config(8)
@@ -95,6 +95,8 @@ esp*	at dma? flags 0x00ff000f			# depending on model
 
 #sun4c, sun4m
 isp*	at sbus?
+qlw*	at sbus?
+#qla*	at sbus?
 
 # sun4/300 and sun4c Ethernet - an AMD 7990 LANCE
 le0	at sbus0					# sun4c on-board
diff --git a/sys/arch/sparc/conf/files.sparc b/sys/arch/sparc/conf/files.sparc
index c0566e0a9b0..e30debbc07c 100644
--- a/sys/arch/sparc/conf/files.sparc
+++ b/sys/arch/sparc/conf/files.sparc
@@ -1,4 +1,4 @@
-#	$OpenBSD: files.sparc,v 1.98 2015/02/28 17:54:54 miod Exp $
+#	$OpenBSD: files.sparc,v 1.99 2015/03/30 20:30:20 miod Exp $
 #	$NetBSD: files.sparc,v 1.44 1997/08/31 21:29:16 pk Exp $
 
 # @(#)files.sparc	8.1 (Berkeley) 7/19/93
@@ -296,6 +296,7 @@ file	arch/sparc/sparc/cache.c
 file	arch/sparc/sparc/conf.c
 file	arch/sparc/sparc/consinit.c
 file	arch/sparc/sparc/disksubr.c
+file	arch/sparc/sparc/dvma.c
 file	arch/sparc/sparc/emul.c
 file	arch/sparc/sparc/in_cksum.c		inet
 file	arch/sparc/sparc/intr.c