From 7c336358c86b4a682820c01073e79082cd53df52 Mon Sep 17 00:00:00 2001
From: Pierre Schweitzer <pierre@reactos.org>
Date: Mon, 22 Feb 2016 22:52:35 +0000
Subject: [PATCH] [NTOSKRNL] Implement the MiWriteCombined case of
 MmMapIoSpace().

This fixes NVIDIA display drivers loading in ReactOS. See: https://www.reactos.org/forum/viewtopic.php?p=120359#p120359

svn path=/trunk/; revision=70774
---
 reactos/ntoskrnl/mm/ARM3/iosup.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/reactos/ntoskrnl/mm/ARM3/iosup.c b/reactos/ntoskrnl/mm/ARM3/iosup.c
index 08a8ba261d0..2549e922f57 100644
--- a/reactos/ntoskrnl/mm/ARM3/iosup.c
+++ b/reactos/ntoskrnl/mm/ARM3/iosup.c
@@ -144,9 +144,10 @@ MmMapIoSpace(IN PHYSICAL_ADDRESS PhysicalAddress,
         case MiWriteCombined:
 
             //
-            // We don't support write combining yet
+            // Disable the cache and allow combined writing
             //
-            ASSERT(FALSE);
+            MI_PAGE_DISABLE_CACHE(&TempPte);
+            MI_PAGE_WRITE_COMBINED(&TempPte);
             break;
 
         default: