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/mvme68k/mvme68k/machdep.c b/sys/arch/mvme68k/mvme68k/machdep.c
index c61381d1a69..eb245c57da6 100644
--- a/sys/arch/mvme68k/mvme68k/machdep.c
+++ b/sys/arch/mvme68k/mvme68k/machdep.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: machdep.c,v 1.120 2009/08/11 19:17:16 miod Exp $ */
+/*	$OpenBSD: machdep.c,v 1.121 2010/06/27 03:03:48 thib Exp $ */
 
 /*
  * Copyright (c) 1995 Theo de Raadt
@@ -141,6 +141,10 @@ int	bufpages = 0;
 int	bufcachepercent = BUFCACHEPERCENT;
 
 int   physmem;			/* size of physical memory, in pages */
+
+struct uvm_constraint_range  dma_constraint = { 0x0, (paddr_t)-1 };
+struct uvm_constraint_range *uvm_md_constraints[] = { NULL };
+
 /*
  * safepri is a safe priority for sleep to set for a spin-wait
  * during autoconfiguration or after a panic.