uvm constraints. Add two mandatory MD symbols, uvm_md_constraints

which contains the constraints for DMA/memory allocation for each
architecture, and dma_constraints which contains the range of addresses
that are dma accessable by the system.

This is based on ariane@'s physcontig diff, with lots of bugfixes and
additions the following additions by my self:

Introduce a new function pool_set_constraints() which sets the address
range for which we allocate pages for the pool from, this is now used
for the mbuf/mbuf cluster pools to keep them dma accessible.

The !direct archs no longer stuff pages into the kernel object in
uvm_km_getpage_pla but rather do a pmap_extract() in uvm_km_putpages.

Tested heavily by my self on i386, amd64 and sparc64. Some tests on
alpha and SGI.

"commit it" beck, art, oga, deraadt
"i like the diff" deraadt

1 files changed, 1 insertions, 4 deletions

diff --git a/sys/arch/sparc64/include/vmparam.h b/sys/arch/sparc64/include/vmparam.h
index b3eca0ba6a4..3d9e6d8fad8 100644
--- a/sys/arch/sparc64/include/vmparam.h
+++ b/sys/arch/sparc64/include/vmparam.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: vmparam.h,v 1.19 2010/04/22 19:02:49 oga Exp $	*/
+/*	$OpenBSD: vmparam.h,v 1.20 2010/06/27 03:03:48 thib Exp $	*/
 /*	$NetBSD: vmparam.h,v 1.18 2001/05/01 02:19:19 thorpej Exp $ */
 
 /*
@@ -145,9 +145,6 @@
 #define	VM_NFREELIST		1
 #define	VM_FREELIST_DEFAULT	0
 
-/* No UVM_IO_RANGES required: IOMMU takes care of this. */
-#define UVM_IO_RANGES {}
-
 #define __HAVE_VM_PAGE_MD
 /*
  * For each struct vm_page, there is a list of all currently valid virtual