/* * ReactOS kernel * Copyright (C) 1998, 1999, 2000, 2001, 2002 ReactOS Team * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ /* * COPYRIGHT: See COPYING in the top level directory * PROJECT: ReactOS kernel * FILE: hal/halppc/generic/display.c * PURPOSE: Blue screen display * PROGRAMMER: Eric Kohl * UPDATE HISTORY: * Created 08/10/99 */ /* * Portions of this code are from the XFree86 Project and available from the * following license: * * Copyright (C) 1994-2003 The XFree86 Project, Inc. All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to * deal in the Software without restriction, including without limitation the * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or * sell copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * XFREE86 PROJECT BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CON- * NECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. * * Except as contained in this notice, the name of the XFree86 Project shall * not be used in advertising or otherwise to promote the sale, use or other * dealings in this Software without prior written authorization from the * XFree86 Project. */ /* DISPLAY OWNERSHIP * * So, who owns the physical display and is allowed to write to it? * * In MS NT, upon boot HAL owns the display. Somewhere in the boot * sequence (haven't figured out exactly where or by who), some * component calls HalAcquireDisplayOwnership. From that moment on, * the display is owned by that component and is switched to graphics * mode. The display is not supposed to return to text mode, except * in case of a bug check. The bug check will call HalDisplayString * to output a string to the text screen. HAL will notice that it * currently doesn't own the display and will re-take ownership, by * calling the callback function passed to HalAcquireDisplayOwnership. * After the bugcheck, execution is halted. So, under NT, the only * possible sequence of display modes is text mode -> graphics mode -> * text mode (the latter hopefully happening very infrequently). * * Things are a little bit different in the current state of ReactOS. * We want to have a functional interactive text mode. We should be * able to switch from text mode to graphics mode when a GUI app is * started and switch back to text mode when it's finished. Then, when * another GUI app is started, another switch to and from graphics mode * is possible. Also, when the system bugchecks in graphics mode we want * to switch back to text mode to show the registers and stack trace. * Last but not least, HalDisplayString is used a lot more in ReactOS, * e.g. to print debug messages when the /DEBUGPORT=SCREEN boot option * is present. * 3 Components are involved in ReactOS: HAL, BLUE.SYS and VIDEOPRT.SYS. * As in NT, on boot HAL owns the display. When entering the text mode * command interpreter, BLUE.SYS kicks in. It will write directly to the * screen, more or less behind HALs back. * When a GUI app is started, WIN32K.SYS will open the DISPLAY device. * This open call will end up in VIDEOPRT.SYS. That component will then * take ownership of the display by calling HalAcquireDisplayOwnership. * When the GUI app terminates (WIN32K.SYS will close the DISPLAY device), * we want to give ownership of the display back to HAL. Using the * standard exported HAL functions, that's a bit of a problem, because * there is no function defined to do that. In NT, this is handled by * HalDisplayString, but that solution isn't satisfactory in ReactOS, * because HalDisplayString is (in some cases) also used to output debug * messages. If we do it the NT way, the first debug message output while * in graphics mode would switch the display back to text mode. * So, instead, if HalDisplayString detects that HAL doesn't have ownership * of the display, it doesn't do anything. * To return ownership to HAL, a new function is exported, * HalReleaseDisplayOwnership. This function is called by the DISPLAY * device Close routine in VIDEOPRT.SYS. It is also called at the beginning * of a bug check, so HalDisplayString is activated again. * Now, while the display is in graphics mode (not owned by HAL), BLUE.SYS * should also refrain from writing to the screen buffer. The text mode * screen buffer might overlap the graphics mode screen buffer, so changing * something in the text mode buffer might mess up the graphics screen. To * allow BLUE.SYS to detect if HAL owns the display, another new function is * exported, HalQueryDisplayOwnership. BLUE.SYS will call this function to * check if it's allowed to touch the text mode buffer. * * In an ideal world, when HAL takes ownership of the display, it should set * up the CRT using real-mode (actually V86 mode, but who cares) INT 0x10 * calls. Unfortunately, this will require HAL to setup a real-mode interrupt * table etc. So, we chickened out of that by having the loader set up the * display before switching to protected mode. If HAL is given back ownership * after a GUI app terminates, the INT 0x10 calls are made by VIDEOPRT.SYS, * since there is already support for them via the VideoPortInt10 routine. */ #include #include #include #define NDEBUG #include boot_infos_t PpcEarlybootInfo; #define SCREEN_SYNCHRONIZATION /* VARIABLES ****************************************************************/ static ULONG CursorX = 0; /* Cursor Position */ static ULONG CursorY = 0; static ULONG SizeX = 80; /* Display size */ static ULONG SizeY = 25; static BOOLEAN DisplayInitialized = FALSE; static BOOLEAN HalOwnsDisplay = TRUE; static ULONG GraphVideoBuffer = 0; static PHAL_RESET_DISPLAY_PARAMETERS HalResetDisplayParameters = NULL; extern UCHAR XboxFont8x16[]; extern void SetPhys( ULONG Addr, ULONG Data ); extern ULONG GetPhys( ULONG Addr ); extern void SetPhysByte( ULONG Addr, ULONG Data ); /* PRIVATE FUNCTIONS *********************************************************/ VOID FASTCALL HalClearDisplay (UCHAR CharAttribute) { ULONG i; ULONG deviceSize = PpcEarlybootInfo.dispDeviceRowBytes * PpcEarlybootInfo.dispDeviceRect[3]; for(i = 0; i < deviceSize; i += sizeof(int) ) SetPhys(GraphVideoBuffer + i, CharAttribute); CursorX = 0; CursorY = 0; } /* STATIC FUNCTIONS *********************************************************/ VOID STATIC HalScrollDisplay (VOID) { ULONG i, deviceSize = PpcEarlybootInfo.dispDeviceRowBytes * PpcEarlybootInfo.dispDeviceRect[3]; ULONG Dest = (ULONG)GraphVideoBuffer, Src = (ULONG)(GraphVideoBuffer + (16 * PpcEarlybootInfo.dispDeviceRowBytes)); ULONG End = (ULONG) GraphVideoBuffer + (PpcEarlybootInfo.dispDeviceRowBytes * (PpcEarlybootInfo.dispDeviceRect[3]-16)); while( Src < End ) { SetPhys((ULONG)Dest, GetPhys(Src)); Src += 4; Dest += 4; } /* Clear the bottom row */ for(i = End; i < deviceSize; i += sizeof(int) ) SetPhys(GraphVideoBuffer + i, 1); } VOID STATIC FASTCALL HalPutCharacter (CHAR Character) { WRITE_PORT_UCHAR((PVOID)0x3f8, Character); #if 0 int i,j,k; ULONG Dest = (GraphVideoBuffer + (16 * PpcEarlybootInfo.dispDeviceRowBytes * CursorY) + (8 * (PpcEarlybootInfo.dispDeviceDepth / 8) * CursorX)), RowDest; UCHAR ByteToPlace; for( i = 0; i < 16; i++ ) { RowDest = Dest; for( j = 0; j < 8; j++ ) { ByteToPlace = ((128 >> j) & (XboxFont8x16[(16 * Character) + i])) ? 0xff : 1; for( k = 0; k < PpcEarlybootInfo.dispDeviceDepth / 8; k++, RowDest++ ) { SetPhysByte(RowDest, ByteToPlace); } } Dest += PpcEarlybootInfo.dispDeviceRowBytes; } #endif } /* PRIVATE FUNCTIONS ********************************************************/ VOID FASTCALL HalInitializeDisplay (PROS_LOADER_PARAMETER_BLOCK LoaderBlock) /* * FUNCTION: Initialize the display * ARGUMENTS: * InitParameters = Parameters setup by the boot loader */ { if (! DisplayInitialized) { boot_infos_t *XBootInfo = (boot_infos_t *)LoaderBlock->ArchExtra; GraphVideoBuffer = (ULONG)XBootInfo->dispDeviceBase; memcpy(&PpcEarlybootInfo, XBootInfo, sizeof(*XBootInfo)); /* Set cursor position */ CursorX = 0; CursorY = 0; SizeX = XBootInfo->dispDeviceRowBytes / XBootInfo->dispDeviceDepth; SizeY = XBootInfo->dispDeviceRect[3] / 16; HalClearDisplay(1); DisplayInitialized = TRUE; } } /* PUBLIC FUNCTIONS *********************************************************/ VOID NTAPI HalReleaseDisplayOwnership(VOID) /* * FUNCTION: Release ownership of display back to HAL */ { if (HalResetDisplayParameters == NULL) return; if (HalOwnsDisplay == TRUE) return; HalOwnsDisplay = TRUE; HalClearDisplay(0); } VOID NTAPI HalAcquireDisplayOwnership(IN PHAL_RESET_DISPLAY_PARAMETERS ResetDisplayParameters) /* * FUNCTION: * ARGUMENTS: * ResetDisplayParameters = Pointer to a driver specific * reset routine. */ { HalOwnsDisplay = FALSE; HalResetDisplayParameters = ResetDisplayParameters; } VOID NTAPI HalDisplayString(IN PCH String) /* * FUNCTION: Switches the screen to HAL console mode (BSOD) if not there * already and displays a string * ARGUMENT: * string = ASCII string to display * NOTE: Use with care because there is no support for returning from BSOD * mode */ { PCH pch; //static KSPIN_LOCK Lock; KIRQL OldIrql; BOOLEAN InterruptsEnabled = __readmsr(); /* See comment at top of file */ if (! HalOwnsDisplay || ! DisplayInitialized) { return; } pch = String; KeRaiseIrql(HIGH_LEVEL, &OldIrql); //KiAcquireSpinLock(&Lock); _disable(); while (*pch != 0) { if (*pch == '\n') { CursorY++; CursorX = 0; } else if (*pch == '\b') { if (CursorX > 0) { CursorX--; } } else if (*pch != '\r') { HalPutCharacter (*pch); CursorX++; if (CursorX >= SizeX) { CursorY++; CursorX = 0; } } if (CursorY >= SizeY) { HalScrollDisplay (); CursorY = SizeY - 1; } pch++; } __writemsr(InterruptsEnabled); //KiReleaseSpinLock(&Lock); KeLowerIrql(OldIrql); } VOID NTAPI HalQueryDisplayParameters(OUT PULONG DispSizeX, OUT PULONG DispSizeY, OUT PULONG CursorPosX, OUT PULONG CursorPosY) { if (DispSizeX) *DispSizeX = SizeX; if (DispSizeY) *DispSizeY = SizeY; if (CursorPosX) *CursorPosX = CursorX; if (CursorPosY) *CursorPosY = CursorY; } VOID NTAPI HalSetDisplayParameters(IN ULONG CursorPosX, IN ULONG CursorPosY) { CursorX = (CursorPosX < SizeX) ? CursorPosX : SizeX - 1; CursorY = (CursorPosY < SizeY) ? CursorPosY : SizeY - 1; } BOOLEAN NTAPI HalQueryDisplayOwnership(VOID) { return !HalOwnsDisplay; } /* EOF */