/*
 * 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.
 *
 * Authors: Tux,
 *          Miran Grca, <mgrca8@gmail.com>
 *          TheCollector1995, <mariogplayer@gmail.com>
 *          EngiNerd <webmaster.crrc@yahoo.it>
 *
 *          Copyright 2016-2019 Tux.
 *          Copyright 2016-2019 Miran Grca.
 *          Copyright 2020 EngiNerd.
 */
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <wchar.h>
#include <86box/86box.h>
#include "cpu.h"
#include <86box/timer.h>
#include <86box/dma.h>
#include <86box/nmi.h>
#include <86box/pic.h>
#include <86box/pit.h>
#include <86box/mem.h>
#include <86box/rom.h>
#include <86box/device.h>
#include <86box/fdd.h>
#include <86box/fdc.h>
#include <86box/fdc_ext.h>
#include <86box/gameport.h>
#include <86box/keyboard.h>
#include <86box/lpt.h>
#include <86box/serial.h>
#include <86box/machine.h>
#include <86box/io.h>
#include <86box/video.h>
#include <86box/plat_unused.h>
#include <86box/chipset.h>

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

static uint8_t
zenith_scratchpad_read(uint32_t addr, void *priv)
{
    const zenith_t *dev = (zenith_t *) priv;

    return dev->scratchpad_ram[addr & 0x3fff];
}

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

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

    dev = (zenith_t *) calloc(1, sizeof(zenith_t));

    dev->scratchpad_ram = calloc(1, 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 *priv)
{
    zenith_t *dev = (zenith_t *) priv;

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

const device_t zenith_scratchpad_device = {
    .name          = "Zenith scratchpad RAM",
    .internal_name = "zenith_scratchpad",
    .flags         = 0,
    .local         = 0,
    .init          = zenith_scratchpad_init,
    .close         = zenith_scratchpad_close,
    .reset         = NULL,
    .available     = NULL,
    .speed_changed = NULL,
    .force_redraw  = NULL,
    .config        = NULL
};
