reactos/hal/halx86/display.c

   1 /*
   2  *  ReactOS kernel
   3  *  Copyright (C) 1998, 1999, 2000, 2001, 2002 ReactOS Team
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19 /* $Id: display.c,v 1.4 2002/09/08 10:22:24 chorns Exp $
  20  *
  21  * COPYRIGHT:       See COPYING in the top level directory
  22  * PROJECT:         ReactOS kernel
  23  * FILE:            ntoskrnl/hal/x86/display.c
  24  * PURPOSE:         Blue screen display
  25  * PROGRAMMER:      Eric Kohl (ekohl@rz-online.de)
  26  * UPDATE HISTORY:
  27  *                  Created 08/10/99
  28  */
  29
  30 #include <ddk/ntddk.h>
  31 #include <mps.h>
  32
  33 #define SCREEN_SYNCHRONIZATION
  34
  35
  36 #define CRTC_COMMAND       0x3d4
  37 #define CRTC_DATA          0x3d5
  38
  39 #define CRTC_COLUMNS       0x01
  40 #define CRTC_OVERFLOW      0x07
  41 #define CRTC_ROWS          0x12
  42 #define CRTC_SCANLINES     0x09
  43
  44 #define CRTC_CURHI         0x0e
  45 #define CRTC_CURLO         0x0f
  46
  47
  48 #define CHAR_ATTRIBUTE     0x17  /* grey on blue */
  49
  50
  51 /* VARIABLES ****************************************************************/
  52
  53 static ULONG CursorX = 0;      /* Cursor Position */
  54 static ULONG CursorY = 0;
  55 static ULONG SizeX = 80;       /* Display size */
  56 static ULONG SizeY = 25;
  57
  58 static BOOLEAN DisplayInitialized = FALSE;
  59 static BOOLEAN HalOwnsDisplay = TRUE;
  60
  61 static WORD *VideoBuffer = NULL;
  62
  63 static PHAL_RESET_DISPLAY_PARAMETERS HalResetDisplayParameters = NULL;
  64
  65
  66 /* STATIC FUNCTIONS *********************************************************/
  67
  68 static VOID
  69 HalClearDisplay (VOID)
  70 {
  71    WORD *ptr = (WORD*)VideoBuffer;
  72    ULONG i;
  73
  74   for (i = 0; i < SizeX * SizeY; i++, ptr++)
  75     *ptr = ((CHAR_ATTRIBUTE << 8) + ' ');
  76
  77   CursorX = 0;
  78   CursorY = 0;
  79 }
  80
  81
  82 VOID
  83 HalScrollDisplay (VOID)
  84 {
  85   WORD *ptr;
  86   int i;
  87
  88   ptr = VideoBuffer + SizeX;
  89   RtlMoveMemory(VideoBuffer,
  90                 ptr,
  91                 SizeX * (SizeY - 1) * 2);
  92
  93   ptr = VideoBuffer  + (SizeX * (SizeY - 1));
  94   for (i = 0; i < SizeX; i++, ptr++)
  95     {
  96       *ptr = (CHAR_ATTRIBUTE << 8) + ' ';
  97     }
  98 }
  99
 100
 101 static VOID
 102 HalPutCharacter (CHAR Character)
 103 {
 104   WORD *ptr;
 105
 106   ptr = VideoBuffer + ((CursorY * SizeX) + CursorX);
 107   *ptr = (CHAR_ATTRIBUTE << 8) + Character;
 108 }
 109
 110
 111 /* PRIVATE FUNCTIONS ********************************************************/
 112
 113 VOID
 114 HalInitializeDisplay (PLOADER_PARAMETER_BLOCK LoaderBlock)
 115 /*
 116  * FUNCTION: Initalize the display
 117  * ARGUMENTS:
 118  *         InitParameters = Parameters setup by the boot loader
 119  */
 120 {
 121   if (DisplayInitialized == FALSE)
 122     {
 123       ULONG ScanLines;
 124       ULONG Data;
 125
 126       VideoBuffer = (WORD *)(0xd0000000 + 0xb8000);
 127 //      VideoBuffer = HalMapPhysicalMemory (0xb8000, 2);
 128
 129       /* Set cursor position */
 130 //      CursorX = LoaderBlock->cursorx;
 131 //      CursorY = LoaderBlock->cursory;
 132       CursorX = 0;
 133       CursorY = 0;
 134
 135       /* read screen size from the crtc */
 136       /* FIXME: screen size should be read from the boot parameters */
 137       WRITE_PORT_UCHAR((PUCHAR)CRTC_COMMAND, CRTC_COLUMNS);
 138       SizeX = READ_PORT_UCHAR((PUCHAR)CRTC_DATA) + 1;
 139       WRITE_PORT_UCHAR((PUCHAR)CRTC_COMMAND, CRTC_ROWS);
 140       SizeY = READ_PORT_UCHAR((PUCHAR)CRTC_DATA);
 141       WRITE_PORT_UCHAR((PUCHAR)CRTC_COMMAND, CRTC_OVERFLOW);
 142       Data = READ_PORT_UCHAR((PUCHAR)CRTC_DATA);
 143       SizeY |= (((Data & 0x02) << 7) | ((Data & 0x40) << 3));
 144       SizeY++;
 145       WRITE_PORT_UCHAR((PUCHAR)CRTC_COMMAND, CRTC_SCANLINES);
 146       ScanLines = (READ_PORT_UCHAR((PUCHAR)CRTC_DATA) & 0x1F) + 1;
 147       SizeY = SizeY / ScanLines;
 148
 149 #ifdef BOCHS_30ROWS
 150       SizeY=30;
 151 #endif
 152       HalClearDisplay();
 153
 154       DisplayInitialized = TRUE;
 155     }
 156 }
 157
 158
 159 VOID
 160 HalResetDisplay(VOID)
 161 /*
 162  * FUNCTION: Reset the display
 163  * ARGUMENTS:
 164  *         None
 165  */
 166 {
 167   if (HalResetDisplayParameters == NULL)
 168     return;
 169
 170   if (HalOwnsDisplay == TRUE)
 171     return;
 172
 173   if (HalResetDisplayParameters(SizeX, SizeY) == TRUE)
 174     {
 175       HalOwnsDisplay = TRUE;
 176       HalClearDisplay();
 177     }
 178 }
 179
 180
 181 /* PUBLIC FUNCTIONS *********************************************************/
 182
 183 VOID STDCALL
 184 HalAcquireDisplayOwnership(IN PHAL_RESET_DISPLAY_PARAMETERS ResetDisplayParameters)
 185 /*
 186  * FUNCTION:
 187  * ARGUMENTS:
 188  *         ResetDisplayParameters = Pointer to a driver specific
 189  *         reset routine.
 190  */
 191 {
 192   HalOwnsDisplay = FALSE;
 193   HalResetDisplayParameters = ResetDisplayParameters;
 194 }
 195
 196
 197 VOID STDCALL
 198 HalDisplayString(IN PCH String)
 199 /*
 200  * FUNCTION: Switches the screen to HAL console mode (BSOD) if not there
 201  * already and displays a string
 202  * ARGUMENT:
 203  *        string = ASCII string to display
 204  * NOTE: Use with care because there is no support for returning from BSOD
 205  * mode
 206  */
 207 {
 208   PCH pch;
 209 #ifdef SCREEN_SYNCHRONIZATION
 210   int offset;
 211 #endif
 212   static KSPIN_LOCK Lock;
 213   ULONG Flags;
 214
 215   pch = String;
 216
 217   pushfl(Flags);
 218   __asm__ ("cli\n\t");
 219   KeAcquireSpinLockAtDpcLevel(&Lock);
 220
 221   if (HalOwnsDisplay == FALSE)
 222     {
 223       HalResetDisplay ();
 224     }
 225
 226 #ifdef SCREEN_SYNCHRONIZATION
 227   WRITE_PORT_UCHAR((PUCHAR)CRTC_COMMAND, CRTC_CURHI);
 228   offset = READ_PORT_UCHAR((PUCHAR)CRTC_DATA)<<8;
 229   WRITE_PORT_UCHAR((PUCHAR)CRTC_COMMAND, CRTC_CURLO);
 230   offset += READ_PORT_UCHAR((PUCHAR)CRTC_DATA);
 231
 232   CursorY = offset / SizeX;
 233   CursorX = offset % SizeX;
 234 #endif
 235
 236   while (*pch != 0)
 237     {
 238       if (*pch == '\n')
 239         {
 240           CursorY++;
 241           CursorX = 0;
 242         }
 243       else if (*pch != '\r')
 244         {
 245           HalPutCharacter (*pch);
 246           CursorX++;
 247
 248           if (CursorX >= SizeX)
 249             {
 250               CursorY++;
 251               CursorX = 0;
 252             }
 253         }
 254
 255       if (CursorY >= SizeY)
 256         {
 257           HalScrollDisplay ();
 258           CursorY = SizeY - 1;
 259         }
 260
 261       pch++;
 262     }
 263
 264 #ifdef SCREEN_SYNCHRONIZATION
 265   offset = (CursorY * SizeX) + CursorX;
 266
 267   WRITE_PORT_UCHAR((PUCHAR)CRTC_COMMAND, CRTC_CURLO);
 268   WRITE_PORT_UCHAR((PUCHAR)CRTC_DATA, offset & 0xff);
 269   WRITE_PORT_UCHAR((PUCHAR)CRTC_COMMAND, CRTC_CURHI);
 270   WRITE_PORT_UCHAR((PUCHAR)CRTC_DATA, (offset >> 8) & 0xff);
 271 #endif
 272   KeReleaseSpinLockFromDpcLevel(&Lock);
 273   popfl(Flags);
 274 }
 275
 276
 277 VOID STDCALL
 278 HalQueryDisplayParameters(OUT PULONG DispSizeX,
 279                           OUT PULONG DispSizeY,
 280                           OUT PULONG CursorPosX,
 281                           OUT PULONG CursorPosY)
 282 {
 283   if (DispSizeX)
 284     *DispSizeX = SizeX;
 285   if (DispSizeY)
 286     *DispSizeY = SizeY;
 287   if (CursorPosX)
 288     *CursorPosX = CursorX;
 289   if (CursorPosY)
 290     *CursorPosY = CursorY;
 291 }
 292
 293
 294 VOID STDCALL
 295 HalSetDisplayParameters(IN ULONG CursorPosX,
 296                         IN ULONG CursorPosY)
 297 {
 298   CursorX = (CursorPosX < SizeX) ? CursorPosX : SizeX - 1;
 299   CursorY = (CursorPosY < SizeY) ? CursorPosY : SizeY - 1;
 300 }
 301
 302 /* EOF */