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- Protected the access to the crtc registers (cursor position) with cli/sti.

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svn path=/trunk/; revision=4279
This commit is contained in:
Hartmut Birr 2003-03-09 21:43:37 +00:00
parent b7c7511503
commit b98522fd18
1 changed files with 5 additions and 1 deletions
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6
reactos/drivers/dd/blue/blue.c
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@ -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;