143 lines
3.6 KiB
C
143 lines
3.6 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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* Implementation of the Magitronic B215 XT-FDC Controller.
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*
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* Authors: Tiseno100
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*
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* Copyright 2021 Tiseno100
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*/
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#include <stdarg.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <wchar.h>
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#define HAVE_STDARG_H
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#include <86box/86box.h>
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#include <86box/timer.h>
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#include <86box/io.h>
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#include <86box/device.h>
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#include <86box/mem.h>
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#include <86box/rom.h>
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#include <86box/fdd.h>
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#include <86box/fdc.h>
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#include <86box/fdc_ext.h>
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#include <86box/plat_unused.h>
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#define ROM_B215 "roms/floppy/magitronic/Magitronic B215 - BIOS ROM.bin"
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#define ROM_ADDR (uint32_t)(device_get_config_hex20("bios_addr") & 0x000fffff)
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#define DRIVE_SELECT (int) (real_drive(dev->fdc_controller, i))
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typedef struct b215_t {
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fdc_t *fdc_controller;
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rom_t rom;
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} b215_t;
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static uint8_t
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b215_read(UNUSED(uint16_t addr), void *priv)
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{
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b215_t *dev = (b215_t *) priv;
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/*
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Register 3F0h
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Bit (3-2) for Drive B:
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Bit (1-0) for Drive A:
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0: 360KB
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1: 1.2MB
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2: 720KB
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3: 1.44MB
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4:
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*/
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int drive_spec[2];
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for (uint8_t i = 0; i <= 1; i++) {
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if (fdd_is_525(DRIVE_SELECT)) {
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if (!fdd_is_dd(DRIVE_SELECT))
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drive_spec[i] = 1;
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else if (fdd_doublestep_40(DRIVE_SELECT))
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drive_spec[i] = 2;
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else
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drive_spec[i] = 0;
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} else {
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if (fdd_is_dd(DRIVE_SELECT) && !fdd_is_double_sided(DRIVE_SELECT))
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drive_spec[i] = 0;
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else if (fdd_is_dd(DRIVE_SELECT) && fdd_is_double_sided(DRIVE_SELECT))
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drive_spec[i] = 2;
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else
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drive_spec[i] = 3;
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}
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}
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return ((drive_spec[1] << 2) | drive_spec[0]) & 0x0f;
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}
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static void
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b215_close(void *priv)
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{
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b215_t *dev = (b215_t *) priv;
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free(dev);
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}
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static void *
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b215_init(UNUSED(const device_t *info))
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{
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b215_t *dev = (b215_t *) calloc(1, sizeof(b215_t));
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rom_init(&dev->rom, ROM_B215, ROM_ADDR, 0x2000, 0x1fff, 0, MEM_MAPPING_EXTERNAL);
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dev->fdc_controller = device_add(&fdc_xt_umc_um8398_device);
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io_sethandler(FDC_PRIMARY_ADDR, 1, b215_read, NULL, NULL, NULL, NULL, NULL, dev);
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return dev;
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}
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static int
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b215_available(void)
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{
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return rom_present(ROM_B215);
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}
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static const device_config_t b215_config[] = {
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// clang-format off
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{
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.name = "bios_addr",
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.description = "BIOS Address",
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.type = CONFIG_HEX20,
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.default_string = NULL,
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.default_int = 0xca000,
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.file_filter = NULL,
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.spinner = { 0 },
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.selection = {
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{ .description = "CA00H", .value = 0xca000 },
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{ .description = "CC00H", .value = 0xcc000 },
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{ .description = "" }
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},
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.bios = { { 0 } }
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},
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{ .name = "", .description = "", .type = CONFIG_END }
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// clang-format on
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};
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const device_t fdc_b215_device = {
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.name = "Magitronic B215",
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.internal_name = "b215",
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.flags = DEVICE_ISA,
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.local = 0,
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.init = b215_init,
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.close = b215_close,
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.reset = NULL,
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.available = b215_available,
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.speed_changed = NULL,
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.force_redraw = NULL,
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.config = b215_config
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};
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