84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
/*
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* VARCem Virtual ARchaeological Computer EMulator.
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* An emulator of (mostly) x86-based PC systems and devices,
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* using the ISA,EISA,VLB,MCA and PCI system buses, roughly
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* spanning the era between 1981 and 1995.
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*
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* This file is part of the VARCem Project.
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*
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* Emulation of the memory I/O scratch registers on ports 0xE1
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* and 0xE2, used by just about any emulated machine.
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*
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* Version: @(#)memregs.c 1.0.1 2018/02/14
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*
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* Author: Miran Grca, <mgrca8@gmail.com>
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*
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* Copyright 2016-2018 Miran Grca.
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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, but
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* 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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* 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:
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*
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* Free Software Foundation, Inc.
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* 59 Temple Place - Suite 330
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* Boston, MA 02111-1307
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* USA.
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include <wchar.h>
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#include "emu.h"
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#include "io.h"
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#include "memregs.h"
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static uint8_t mem_regs[16] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
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static uint8_t mem_reg_ffff = 0;
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void memregs_write(uint16_t port, uint8_t val, void *priv)
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{
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if (port == 0xffff)
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{
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mem_reg_ffff = 0;
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}
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mem_regs[port & 0xf] = val;
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}
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uint8_t memregs_read(uint16_t port, void *priv)
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{
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if (port == 0xffff)
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{
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return mem_reg_ffff;
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}
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return mem_regs[port & 0xf];
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}
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void memregs_init(void)
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{
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/* pclog("Memory Registers Init\n"); */
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io_sethandler(0x00e1, 0x0002, memregs_read, NULL, NULL, memregs_write, NULL, NULL, NULL);
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}
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void powermate_memregs_init(void)
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{
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/* pclog("Memory Registers Init\n"); */
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io_sethandler(0x00ed, 0x0002, memregs_read, NULL, NULL, memregs_write, NULL, NULL, NULL);
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io_sethandler(0xffff, 0x0001, memregs_read, NULL, NULL, memregs_write, NULL, NULL, NULL);
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}
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