From b98522fd18eee0a65529e81ab79f2c6a3404f460 Mon Sep 17 00:00:00 2001
From: Hartmut Birr <osexpert@googlemail.com>
Date: Sun, 9 Mar 2003 21:43:37 +0000
Subject: [PATCH] - Protected the access to the crtc registers (cursor
 position) with cli/sti.

svn path=/trunk/; revision=4279
---
 reactos/drivers/dd/blue/blue.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/reactos/drivers/dd/blue/blue.c b/reactos/drivers/dd/blue/blue.c
index 85be356e6a0..7a5d56b4866 100644
--- a/reactos/drivers/dd/blue/blue.c
+++ b/reactos/drivers/dd/blue/blue.c
@@ -1,4 +1,4 @@
-/* $Id: blue.c,v 1.35 2002/09/08 10:22:04 chorns Exp $
+/* $Id: blue.c,v 1.36 2003/03/09 21:43:37 hbirr Exp $
  *
  * COPYRIGHT:            See COPYING in the top level directory
  * PROJECT:              ReactOS kernel
@@ -175,10 +175,12 @@ ScrWrite(PDEVICE_OBJECT DeviceObject,
     rows = DeviceExtension->Rows;
     columns = DeviceExtension->Columns;
 
+    __asm__ ("cli\n\t");
     WRITE_PORT_UCHAR (CRTC_COMMAND, CRTC_CURSORPOSHI);
     offset = READ_PORT_UCHAR (CRTC_DATA)<<8;
     WRITE_PORT_UCHAR (CRTC_COMMAND, CRTC_CURSORPOSLO);
     offset += READ_PORT_UCHAR (CRTC_DATA);
+    __asm__ ("sti\n\t");
 
     cursory = offset / columns;
     cursorx = offset % columns;
@@ -268,11 +270,13 @@ ScrWrite(PDEVICE_OBJECT DeviceObject,
        /* Set the cursor position */
        offset = (cursory * columns) + cursorx;
     }
+    __asm__ ("cli\n\t");
     WRITE_PORT_UCHAR (CRTC_COMMAND, CRTC_CURSORPOSLO);
     WRITE_PORT_UCHAR (CRTC_DATA, offset);
     WRITE_PORT_UCHAR (CRTC_COMMAND, CRTC_CURSORPOSHI);
     offset >>= 8;
     WRITE_PORT_UCHAR (CRTC_DATA, offset);
+    __asm__ ("sti\n\t");
 
     Status = STATUS_SUCCESS;