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, 4 insertions, 1 deletions

diff --git a/sys/arch/gumstix/gumstix/gumstix_machdep.c b/sys/arch/gumstix/gumstix/gumstix_machdep.c
index a3e278b83df..43edb526dcb 100644
--- a/sys/arch/gumstix/gumstix/gumstix_machdep.c
+++ b/sys/arch/gumstix/gumstix/gumstix_machdep.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: gumstix_machdep.c,v 1.2 2009/07/26 18:48:55 miod Exp $	*/
+/*	$OpenBSD: gumstix_machdep.c,v 1.3 2010/06/27 03:03:48 thib Exp $	*/
 /*	$NetBSD: lubbock_machdep.c,v 1.2 2003/07/15 00:25:06 lukem Exp $ */
 
 /*
@@ -239,6 +239,9 @@ pv_addr_t kernel_pt_table[NUM_KERNEL_PTS];
 
 extern struct user *proc0paddr;
 
+struct uvm_constraint_range  dma_constraint = { 0x0, (paddr_t)-1 };
+struct uvm_constraint_range *uvm_md_constraints[] = { NULL };
+
 /* Prototypes */
 
 #define	BOOT_STRING_MAGIC 0x4f425344