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, 5 insertions, 1 deletions

diff --git a/sys/arch/socppc/socppc/machdep.c b/sys/arch/socppc/socppc/machdep.c
index c1bdc1d4b61..9e0aec76061 100644
--- a/sys/arch/socppc/socppc/machdep.c
+++ b/sys/arch/socppc/socppc/machdep.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: machdep.c,v 1.24 2010/06/10 17:54:13 deraadt Exp $	*/
+/*	$OpenBSD: machdep.c,v 1.25 2010/06/27 03:03:48 thib Exp $	*/
 /*	$NetBSD: machdep.c,v 1.4 1996/10/16 19:33:11 ws Exp $	*/
 
 /*
@@ -48,6 +48,7 @@
 #include <sys/tty.h>
 #include <sys/user.h>
 
+#include <uvm/uvm.h>
 #include <uvm/uvm_extern.h>
 
 #include <machine/bat.h>
@@ -85,6 +86,9 @@ int bufpages = 0;
 #endif
 int bufcachepercent = BUFCACHEPERCENT;
 
+struct uvm_constraint_range  dma_constraint = { 0x0, (paddr_t)-1 };
+struct uvm_constraint_range *uvm_md_constraints[] = { NULL };
+
 struct bat battable[16];
 
 struct vm_map *exec_map = NULL;