65 lines
1.5 KiB
C
65 lines
1.5 KiB
C
/*
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* 86Box A hypervisor and IBM PC system emulator that specializes in
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* running old operating systems and software designed for IBM
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* PC systems and compatibles from 1981 through fairly recent
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* system designs based on the PCI bus.
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*
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* This file is part of the 86Box distribution.
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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 1.0.2 2017/09/24
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*
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* Author: Miran Grca, <mgrca8@gmail.com>
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* Copyright 2016-2017 Miran Grca.
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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 "ibm.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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