108 lines
3.1 KiB
C++
108 lines
3.1 KiB
C++
/*
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* Copyright (C) 2002-2004 The DOSBox Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "dosbox.h"
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#include "inout.h"
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IO_WriteHandler * io_writehandlers[3][IO_MAX];
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IO_ReadHandler * io_readhandlers[3][IO_MAX];
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static Bitu IO_ReadBlocked(Bitu port,Bitu iolen) {
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return (Bitu)-1;
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}
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static void IO_WriteBlocked(Bitu port,Bitu val,Bitu iolen) {
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}
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static Bitu IO_ReadDefault(Bitu port,Bitu iolen) {
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switch (iolen) {
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case 1:
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LOG(LOG_IO,LOG_WARN)("Read from port %04X",port);
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io_readhandlers[0][port]=IO_ReadBlocked;
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return 0xff;
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case 2:
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return
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(io_readhandlers[0][port+0](port+0,1) << 0) |
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(io_readhandlers[0][port+1](port+1,1) << 8);
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case 4:
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return
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(io_readhandlers[1][port+0](port+0,2) << 0) |
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(io_readhandlers[1][port+2](port+2,2) << 16);
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}
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return 0;
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}
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void IO_WriteDefault(Bitu port,Bitu val,Bitu iolen) {
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switch (iolen) {
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case 1:
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LOG(LOG_IO,LOG_WARN)("Writing %02X to port %04X",val,port);
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io_writehandlers[0][port]=IO_WriteBlocked;
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break;
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case 2:
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io_writehandlers[0][port+0](port+0,(val >> 0) & 0xff,1);
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io_writehandlers[0][port+1](port+1,(val >> 8) & 0xff,1);
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break;
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case 4:
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io_writehandlers[1][port+0](port+0,(val >> 0 ) & 0xffff,2);
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io_writehandlers[1][port+2](port+2,(val >> 16) & 0xffff,2);
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break;
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}
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}
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void IO_RegisterReadHandler(Bitu port,IO_ReadHandler * handler,Bitu mask,Bitu range) {
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while (range--) {
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if (mask&IO_MB) io_readhandlers[0][port]=handler;
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if (mask&IO_MW) io_readhandlers[1][port]=handler;
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if (mask&IO_MD) io_readhandlers[2][port]=handler;
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port++;
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}
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}
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void IO_RegisterWriteHandler(Bitu port,IO_WriteHandler * handler,Bitu mask,Bitu range) {
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while (range--) {
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if (mask&IO_MB) io_writehandlers[0][port]=handler;
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if (mask&IO_MW) io_writehandlers[1][port]=handler;
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if (mask&IO_MD) io_writehandlers[2][port]=handler;
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port++;
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}
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}
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void IO_FreeReadHandler(Bitu port,Bitu mask,Bitu range) {
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while (range--) {
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if (mask&IO_MB) io_readhandlers[0][port]=IO_ReadDefault;
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if (mask&IO_MW) io_readhandlers[1][port]=IO_ReadDefault;
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if (mask&IO_MD) io_readhandlers[2][port]=IO_ReadDefault;
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port++;
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}
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}
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void IO_FreeWriteHandler(Bitu port,Bitu mask,Bitu range) {
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while (range--) {
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if (mask&IO_MB) io_writehandlers[0][port]=IO_WriteDefault;
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if (mask&IO_MW) io_writehandlers[1][port]=IO_WriteDefault;
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if (mask&IO_MD) io_writehandlers[2][port]=IO_WriteDefault;
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port++;
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}
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}
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void IO_Init(Section * sect) {
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IO_FreeReadHandler(0,IO_MA,IO_MAX);
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IO_FreeWriteHandler(0,IO_MA,IO_MAX);
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}
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