/* $XFree86: xc/programs/Xserver/hw/xfree86/SuperProbe/Herc.c,v 3.4 1996/12/23 06:31:11 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: Herc.c /main/5 1996/02/21 17:10:16 kaleb $ */ #include "Probe.h" static Word Ports[] = {0x3BA}; #define NUMPORTS (sizeof(Ports)/sizeof(Word)) #define DSP_VSYNC_MASK 0x80 #define DSP_ID_MASK 0x70 Bool Probe_Herc(Chipset) int *Chipset; { Bool result = FALSE; int i, cnt = 0; Byte dsp, dsp_old; EnableIOPorts(NUMPORTS, Ports); dsp_old = inp(0x3BA) & DSP_VSYNC_MASK; for (i = 0; i < 0x10000; i++) { dsp = inp(0x3BA) & DSP_VSYNC_MASK; if (dsp != dsp_old) cnt++; dsp_old = dsp; } /* If there are active sync changes, we found a Hercules board. */ if (cnt) { dsp = inp(0x3BA) & DSP_ID_MASK; switch(dsp) { case 0x10: *Chipset = CHIP_HERC_PLUS; break; case 0x50: *Chipset = CHIP_HERC_COL; break; default: *Chipset = CHIP_HERC_STD; } result = TRUE; } DisableIOPorts(NUMPORTS, Ports); return(result); }