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Fixed hal display bug

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svn path=/trunk/; revision=924
This commit is contained in:
Eric Kohl 2000-01-09 21:39:07 +00:00
parent fd411d8b8c
commit 492a608e06
1 changed files with 31 additions and 12 deletions
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35
reactos/ntoskrnl/hal/x86/display.c
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@ -1,4 +1,4 @@
/* $Id: display.c,v 1.4 1999/12/12 03:48:47 phreak Exp $
/* $Id: display.c,v 1.5 2000/01/09 21:39:07 ekohl Exp $
*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
@ -19,12 +19,16 @@
#define SCREEN_SYNCHRONIZATION
#ifdef SCREEN_SYNCHRONIZATION
#define CRTC_COMMAND 0x3d4
#define CRTC_DATA 0x3d5
#define CRTC_CURLO 0x0f
#define CRTC_COLUMNS 0x01
#define CRTC_OVERFLOW 0x07
#define CRTC_ROWS 0x12
#define CRTC_SCANLINES 0x09
#define CRTC_CURHI 0x0e
#endif
#define CRTC_CURLO 0x0f
#define CHAR_ATTRIBUTE 0x17 /* grey on blue */
@ -34,8 +38,8 @@
static ULONG CursorX = 0; /* Cursor Position */
static ULONG CursorY = 0;
static ULONG SizeX = 80; /* Display size */
static ULONG SizeY = 50;
static ULONG SizeX = 0; /* Display size */
static ULONG SizeY = 0;
static BOOLEAN DisplayInitialized = FALSE;
static BOOLEAN HalOwnsDisplay = TRUE;
@ -102,14 +106,29 @@ HalInitializeDisplay (boot_param *bp)
{
if (DisplayInitialized == FALSE)
{
ULONG ScanLines;
ULONG Data;
VideoBuffer = (WORD *)(0xd0000000 + 0xb8000);
// VideoBuffer = HalMapPhysicalMemory (0xb8000, 2);
/* Set cursor position */
CursorX = bp->cursorx;
CursorY = bp->cursory;
SizeX = 80;
SizeY = 50;
/* read screen size from the crtc */
/* FIXME: screen size should be read from the boot paramseters */
outb_p (CRTC_COMMAND, CRTC_COLUMNS);
SizeX = inb_p (CRTC_DATA) + 1;
outb_p (CRTC_COMMAND, CRTC_ROWS);
SizeY = inb_p (CRTC_DATA);
outb_p (CRTC_COMMAND, CRTC_OVERFLOW);
Data = inb_p (CRTC_DATA);
SizeY |= (((Data & 0x02) << 7) | ((Data & 0x40) << 3));
SizeY++;
outb_p (CRTC_COMMAND, CRTC_SCANLINES);
ScanLines = (inb_p (CRTC_DATA) & 0x1F) + 1;
SizeY = SizeY / ScanLines;
HalClearDisplay ();