72 lines
2.0 KiB
C++
72 lines
2.0 KiB
C++
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/////////////////////////////////////////////////////////////////////////
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// $Id$
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/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2018 The Bochs Project
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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// DDC stub (when ready, this code should return the VESA EDID for the
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// Bochs plug&play monitor)
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// Define BX_PLUGGABLE in files that can be compiled into plugins. For
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// platforms that require a special tag on exported symbols, BX_PLUGGABLE
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// is used to know when we are exporting symbols and when we are importing.
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#define BX_PLUGGABLE
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#include "bochs.h"
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#include "ddc.h"
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#define LOG_THIS
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bx_ddc_c::bx_ddc_c(void)
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{
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put("DDC");
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s.DCKhost = 1;
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s.DDAhost = 1;
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s.DCKmon = 1;
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s.DDAmon = 1;
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s.retval = 0x0f;
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}
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bx_ddc_c::~bx_ddc_c(void)
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{
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}
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Bit8u bx_ddc_c::read()
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{
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return s.retval;
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}
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void bx_ddc_c::write(bx_bool dck, bx_bool dda)
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{
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if (dck != s.DCKhost) {
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BX_INFO(("DCK now %s", dck ? "inactive":"active low"));
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s.DCKhost = dck;
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}
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if (dda != s.DDAhost) {
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BX_INFO(("DDA now %s", dda ? "inactive":"active low"));
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s.DDAhost = dda;
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}
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combine_signals();
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}
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void bx_ddc_c::combine_signals()
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{
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s.retval = (s.DCKhost & s.DCKmon) << 2;
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s.retval |= ((s.DDAhost & s.DDAmon) << 3);
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s.retval |= ((s.DDAhost << 1) | s.DCKhost);
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}
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