86Box/src/machine/m_xt_zenith.c

/*
 * 86Box	A hypervisor and IBM PC system emulator that specializes in
 *		running old operating systems and software designed for IBM
 *		PC systems and compatibles from 1981 through fairly recent
 *		system designs based on the PCI bus.
 *
 *		This file is part of the 86Box distribution.
 *
 *		Emulation of various Zenith PC compatible machines.
 *		Currently only the Zenith Data Systems Supersport is emulated.
 *
 * Version:	@(#)m_xt_compaq.c	1.0.1	2019/11/15
 *
 * Authors:	Sarah Walker, <http://pcem-emulator.co.uk/>
 *		Miran Grca, <mgrca8@gmail.com>
 *		TheCollector1995, <mariogplayer@gmail.com>
 *
 *		Copyright 2008-2019 Sarah Walker.
 *		Copyright 2016-2019 Miran Grca.
 */
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <wchar.h>
#include "86box.h"
#include "cpu.h"
#include "timer.h"
#include "dma.h"
#include "nmi.h"
#include "pic.h"
#include "pit.h"
#include "mem.h"
#include "rom.h"
#include "device.h"
#include "fdd.h"
#include "fdc.h"
#include "gameport.h"
#include "keyboard.h"
#include "lpt.h"
#include "serial.h"
#include "machine.h"


typedef struct {
    mem_mapping_t scratchpad_mapping;
    uint8_t *scratchpad_ram;
} zenith_t;


static uint8_t
zenith_scratchpad_read(uint32_t addr, void *p)
{
    zenith_t *dev = (zenith_t *)p;
    return dev->scratchpad_ram[addr & 0x3fff];
}


static void
zenith_scratchpad_write(uint32_t addr, uint8_t val, void *p)
{
    zenith_t *dev = (zenith_t *)p;
    dev->scratchpad_ram[addr & 0x3fff] = val;
}


static void *
zenith_scratchpad_init(const device_t *info)
{
    zenith_t *dev;

    dev = (zenith_t *)malloc(sizeof(zenith_t));
    memset(dev, 0x00, sizeof(zenith_t));	
	
    dev->scratchpad_ram = malloc(0x4000);
    
    mem_mapping_add(&dev->scratchpad_mapping, 0xf0000, 0x4000,
			zenith_scratchpad_read, NULL, NULL,
			zenith_scratchpad_write, NULL, NULL,
			dev->scratchpad_ram,  MEM_MAPPING_EXTERNAL, dev);
			
    return dev;
}


static void 
zenith_scratchpad_close(void *p)
{
    zenith_t *dev = (zenith_t *)p;

    free(dev->scratchpad_ram);
    free(dev);
}


static const device_t zenith_scratchpad_device = {
    "Zenith scratchpad RAM",
    0, 0,
    zenith_scratchpad_init, zenith_scratchpad_close, NULL,
    NULL,
    NULL,
    NULL
};


int
machine_xt_zenith_init(const machine_t *model)
{		
    int ret;

    ret = bios_load_linear(L"roms/machines/zdsupers/z184m v3.1d.10d",
			   0x000f8000, 32768, 0);

    if (bios_only || !ret)
	return ret;

    machine_common_init(model);

    device_add(&fdc_xt_device);
    lpt1_remove();	/* only one parallel port */
    lpt2_remove();
    lpt1_init(0x278);
    device_add(&i8250_device);
    serial_set_next_inst(2);	/* So that serial_standalone_init() won't do anything. */
    device_add(&zenith_scratchpad_device);
    pit_ctr_set_out_func(&pit->counters[1], pit_refresh_timer_xt);
    device_add(&keyboard_xt_compaq_device);
    nmi_init();

    return ret;
}