/* $XFree86: xc/programs/Xserver/hw/xfree86/SuperProbe/CGA.c,v 3.4 1996/12/23 06:31:05 dawes Exp $ */ /* * (c) Copyright 1993,1994 by David Wexelblat * * 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 * DAVID WEXELBLAT BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. * * Except as contained in this notice, the name of David Wexelblat shall not be * used in advertising or otherwise to promote the sale, use or other dealings * in this Software without prior written authorization from David Wexelblat. * */ /* $XConsortium: CGA.c /main/5 1996/02/21 17:09:35 kaleb $ */ #include "Probe.h" /* * Assume that the CRT Controller is at 0x3D4 (either no other adapter, * or an EGA/CGA is installed in Mono mode). Look for the cursor * postition register. */ static Word Ports[] = {0x3D4, 0x3D5}; #define NUMPORTS (sizeof(Ports)/sizeof(Word)) Bool Probe_CGA(Chipset) int *Chipset; { Bool result = FALSE; Byte tmp; EnableIOPorts(NUMPORTS, Ports); tmp = rdinx(0x3D4, 0x0F); if (testinx(0x3D4, 0x0F)) { result = TRUE; if (testinx(0x3D4, 0x13)) { *Chipset = CHIP_MCGA; } else { *Chipset = CHIP_CGA; } } wrinx(0x3D4, 0x0F, tmp); DisableIOPorts(NUMPORTS, Ports); return(result); }