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/arm/arm/arm32_machdep.c b/sys/arch/arm/arm/arm32_machdep.c
index b90be48c651..d3e6e5b96e3 100644
--- a/sys/arch/arm/arm/arm32_machdep.c
+++ b/sys/arch/arm/arm/arm32_machdep.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: arm32_machdep.c,v 1.33 2010/06/09 15:44:17 miod Exp $	*/
+/*	$OpenBSD: arm32_machdep.c,v 1.34 2010/06/27 03:03:48 thib Exp $	*/
 /*	$NetBSD: arm32_machdep.c,v 1.42 2003/12/30 12:33:15 pk Exp $	*/
 
 /*
@@ -54,6 +54,7 @@
 #include <sys/msg.h>
 #include <sys/msgbuf.h>
 #include <sys/device.h>
+#include <uvm/uvm.h>
 #include <uvm/uvm_extern.h>
 #include <sys/sysctl.h>
 
@@ -86,6 +87,9 @@ 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 };
+
 int cold = 1;
 
 pv_addr_t kernelstack;