/*
 * 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.
 *
 *		Driver for the ESDI controller (WD1007-vse1) for PC/AT.
 *
 * Version:	@(#)hdc_esdi_at.c	1.0.15	2018/10/31
 *
 * Authors:	Sarah Walker, <http://pcem-emulator.co.uk/>
 *		Miran Grca, <mgrca8@gmail.com>
 *		Fred N. van Kempen, <decwiz@yahoo.com>
 *
 *		Copyright 2008-2019 Sarah Walker.
 *		Copyright 2016-2019 Miran Grca.
 *		Copyright 2017-2019 Fred N. van Kempen.
 */
#define _LARGEFILE_SOURCE
#define _LARGEFILE64_SOURCE
#define _GNU_SOURCE
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <wchar.h>
#define HAVE_STDARG_H
#include "../86box.h"
#include "../device.h"
#include "../io.h"
#include "../mem.h"
#include "../pic.h"
#include "../rom.h"
#include "../cpu/cpu.h"
#include "../machine/machine.h"
#include "../timer.h"
#include "../plat.h"
#include "../ui.h"
#include "hdc.h"
#include "hdd.h"


#define HDC_TIME		(TIMER_USEC*10LL)
#define BIOS_FILE		L"roms/hdd/esdi_at/62-000279-061.bin"

#define STAT_ERR		0x01
#define STAT_INDEX		0x02
#define STAT_CORRECTED_DATA	0x04
#define STAT_DRQ		0x08	/* Data request */
#define STAT_DSC                0x10
#define STAT_SEEK_COMPLETE      0x20
#define STAT_READY		0x40
#define STAT_BUSY		0x80

#define ERR_DAM_NOT_FOUND       0x01	/* Data Address Mark not found */
#define ERR_TR000               0x02	/* track 0 not found */
#define ERR_ABRT		0x04	/* command aborted */
#define ERR_ID_NOT_FOUND	0x10	/* ID not found */
#define ERR_DATA_CRC	        0x40	/* data CRC error */
#define ERR_BAD_BLOCK	        0x80	/* bad block detected */

#define CMD_NOP                 0x00
#define CMD_RESTORE		0x10
#define CMD_READ		0x20
#define CMD_WRITE		0x30
#define CMD_VERIFY		0x40
#define CMD_FORMAT		0x50
#define CMD_SEEK   		0x70
#define CMD_DIAGNOSE		0x90
#define CMD_SET_PARAMETERS	0x91
#define CMD_READ_PARAMETERS	0xec


typedef struct {
    int		cfg_spt;
    int		cfg_hpc;
    int		current_cylinder;
    int		real_spt;
    int		real_hpc;
    int		real_tracks;
    int		present;
    int		hdd_num;
} drive_t;

typedef struct {
    uint8_t	status;
    uint8_t	error;
    int		secount,sector,cylinder,head,cylprecomp;
    uint8_t	command;
    uint8_t	fdisk;
    int		pos;

    int		drive_sel;
    int		reset;
    uint16_t	buffer[256];
    int		irqstat;

    pc_timer_t	callback_timer;

    drive_t	drives[2];

    rom_t	bios_rom;
} esdi_t;


#ifdef ENABLE_ESDI_AT_LOG
int esdi_at_do_log = ENABLE_ESDI_AT_LOG;


static void
esdi_at_log(const char *fmt, ...)
{
    va_list ap;

    if (esdi_at_do_log) {
	va_start(ap, fmt);
	pclog_ex(fmt, ap);
	va_end(ap);
    }
}
#else
#define esdi_at_log(fmt, ...)
#endif


static __inline void
irq_raise(esdi_t *esdi)
{
    if (!(esdi->fdisk & 2))
	picint(1 << 14);

    esdi->irqstat = 1;
}


static __inline void
irq_lower(esdi_t *esdi)
{
    picintc(1 << 14);
}


static __inline void
irq_update(esdi_t *esdi)
{
    if (esdi->irqstat && !((pic2.pend | pic2.ins) & 0x40) && !(esdi->fdisk & 2))
	picint(1 << 14);
}


/* Return the sector offset for the current register values. */
static int
get_sector(esdi_t *esdi, off64_t *addr)
{
    drive_t *drive = &esdi->drives[esdi->drive_sel];
    int heads = drive->cfg_hpc;
    int sectors = drive->cfg_spt;
    int c, h, s;

    if (esdi->head > heads) {
	esdi_at_log("esdi_get_sector: past end of configured heads\n");
	return(1);
    }

    if (esdi->sector >= sectors+1) {
	esdi_at_log("esdi_get_sector: past end of configured sectors\n");
	return(1);
    }

    if (drive->cfg_spt==drive->real_spt && drive->cfg_hpc==drive->real_hpc) {
	*addr = ((((off64_t) esdi->cylinder * heads) + esdi->head) *
					sectors) + (esdi->sector - 1);
    } else {
	/*
	 * When performing translation, the firmware seems to leave 1
	 * sector per track inaccessible (spare sector)
	 */

	*addr = ((((off64_t) esdi->cylinder * heads) + esdi->head) *
					sectors) + (esdi->sector - 1);

	s = *addr % (drive->real_spt - 1);
	h = (*addr / (drive->real_spt - 1)) % drive->real_hpc;
	c = (*addr / (drive->real_spt - 1)) / drive->real_hpc;

	*addr = ((((off64_t)c * drive->real_hpc) + h) * drive->real_spt) + s;
    }
        
    return(0);
}


/* Move to the next sector using CHS addressing. */
static void
next_sector(esdi_t *esdi)
{
    drive_t *drive = &esdi->drives[esdi->drive_sel];

    esdi->sector++;
    if (esdi->sector == (drive->cfg_spt + 1)) {
	esdi->sector = 1;
	if (++esdi->head == drive->cfg_hpc) {
		esdi->head = 0;
		esdi->cylinder++;
		if (drive->current_cylinder < drive->real_tracks)
			drive->current_cylinder++;
	}
    }
}


static void
esdi_writew(uint16_t port, uint16_t val, void *priv)
{
    esdi_t *esdi = (esdi_t *)priv;

    esdi->buffer[esdi->pos >> 1] = val;
    esdi->pos += 2;

    if (esdi->pos >= 512) {
	esdi->pos = 0;
	esdi->status = STAT_BUSY;
	/* 390.625 us per sector at 10 Mbit/s = 1280 kB/s. */
	timer_set_delay_u64(&esdi->callback_timer, (3125 * TIMER_USEC) / 8);
    }
}


static void
esdi_write(uint16_t port, uint8_t val, void *priv)
{
    esdi_t *esdi = (esdi_t *)priv;

    esdi_at_log("WD1007 write(%04x, %02x)\n", port, val);

    switch (port) {
	case 0x1f0:	/* data */
		esdi_writew(port, val | (val << 8), priv);
		return;

	case 0x1f1:	/* write precompensation */
		esdi->cylprecomp = val;
		return;

	case 0x1f2:	/* sector count */
		esdi->secount = val;
		return;

	case 0x1f3:	/* sector */
		esdi->sector = val;
		return;

	case 0x1f4:	/* cylinder low */
		esdi->cylinder = (esdi->cylinder & 0xFF00) | val;
		return;

	case 0x1f5:	/* cylinder high */
		esdi->cylinder = (esdi->cylinder & 0xFF) | (val << 8);
		return;

	case 0x1f6: /* drive/Head */
		esdi->head = val & 0xF;
		esdi->drive_sel = (val & 0x10) ? 1 : 0;
		if (esdi->drives[esdi->drive_sel].present)
			esdi->status = STAT_READY | STAT_DSC;
		else
			esdi->status = 0;
		return;

	case 0x1f7:	/* command register */
		irq_lower(esdi);
		esdi->command = val;
		esdi->error = 0;

		esdi_at_log("WD1007: command %02x\n", val & 0xf0);

		switch (val & 0xf0) {
			case CMD_RESTORE:
				esdi->command &= ~0x0f; /*mask off step rate*/
				esdi->status = STAT_BUSY;
				timer_set_delay_u64(&esdi->callback_timer, 200 * HDC_TIME);
				break;

			case CMD_SEEK:
				esdi->command &= ~0x0f; /*mask off step rate*/
				esdi->status = STAT_BUSY;
				timer_set_delay_u64(&esdi->callback_timer, 200 * HDC_TIME);
				break;

			default:
				switch (val) {
					case CMD_NOP:
						esdi->status = STAT_BUSY;
						timer_set_delay_u64(&esdi->callback_timer, 200 * HDC_TIME);
						break;

					case CMD_READ:
					case CMD_READ+1:
					case CMD_READ+2:
					case CMD_READ+3:
						esdi->command &= ~0x03;
						if (val & 0x02)
							fatal("Read with ECC\n");
						/*FALLTHROUGH*/

					case 0xa0:
						esdi->status = STAT_BUSY;
						timer_set_delay_u64(&esdi->callback_timer, 200 * HDC_TIME);
						break;

					case CMD_WRITE:
					case CMD_WRITE+1:
					case CMD_WRITE+2:
					case CMD_WRITE+3:
						esdi->command &= ~0x03;
						if (val & 0x02)
							fatal("Write with ECC\n");
						esdi->status = STAT_DRQ | STAT_DSC;
						esdi->pos = 0;
						break;

					case CMD_VERIFY:
					case CMD_VERIFY+1:
						esdi->command &= ~0x01;
						esdi->status = STAT_BUSY;
						timer_set_delay_u64(&esdi->callback_timer, 200 * HDC_TIME);
						break;

					case CMD_FORMAT:
						esdi->status = STAT_DRQ;
						esdi->pos = 0;
						break;

					case CMD_SET_PARAMETERS: /* Initialize Drive Parameters */
						esdi->status = STAT_BUSY;
						timer_set_delay_u64(&esdi->callback_timer, 30 * HDC_TIME);
						break;

					case CMD_DIAGNOSE: /* Execute Drive Diagnostics */
						esdi->status = STAT_BUSY;
						timer_set_delay_u64(&esdi->callback_timer, 200 * HDC_TIME);
						break;

					case 0xe0: /*???*/
					case CMD_READ_PARAMETERS:
						esdi->status = STAT_BUSY;
						timer_set_delay_u64(&esdi->callback_timer, 200 * HDC_TIME);
						break;

					default:
						esdi_at_log("WD1007: bad command %02X\n", val);
						/*FALLTHROUGH*/
					case 0xe8: /*???*/
						esdi->status = STAT_BUSY;
						timer_set_delay_u64(&esdi->callback_timer, 200 * HDC_TIME);
						break;
				}
		}
		break;

	case 0x3f6: /* Device control */
		if ((esdi->fdisk & 0x04) && !(val & 0x04)) {
                        timer_set_delay_u64(&esdi->callback_timer, 500 * HDC_TIME);
			esdi->reset = 1;
			esdi->status = STAT_BUSY;
		}

		if (val & 0x04) {
			/* Drive held in reset. */
                        timer_disable(&esdi->callback_timer);
			esdi->status = STAT_BUSY;
		}
		esdi->fdisk = val;
                irq_update(esdi);
		break;
	}
}


static uint16_t
esdi_readw(uint16_t port, void *priv)
{
    esdi_t *esdi = (esdi_t *)priv;
    uint16_t temp;

    temp = esdi->buffer[esdi->pos >> 1];
    esdi->pos += 2;

    if (esdi->pos >= 512) {
	esdi->pos=0;
	esdi->status = STAT_READY | STAT_DSC;
	if (esdi->command == CMD_READ || esdi->command == 0xa0) {
		esdi->secount = (esdi->secount - 1) & 0xff;
		if (esdi->secount) {
			next_sector(esdi);
			esdi->status = STAT_BUSY;
			/* 390.625 us per sector at 10 Mbit/s = 1280 kB/s. */
			timer_set_delay_u64(&esdi->callback_timer, (3125 * TIMER_USEC) / 8);
		} else {
			ui_sb_update_icon(SB_HDD|HDD_BUS_ESDI, 0);
		}
	}
    }

    return(temp);
}


static uint8_t
esdi_read(uint16_t port, void *priv)
{
    esdi_t *esdi = (esdi_t *)priv;
    uint8_t temp = 0xff;

    switch (port) {
	case 0x1f0:	/* data */
		temp = esdi_readw(port, esdi) & 0xff;
		break;

	case 0x1f1:	/* error */
		temp = esdi->error;
		break;

	case 0x1f2:	/* sector count */
		temp = esdi->secount;
		break;

	case 0x1f3:	/* sector */
		temp = esdi->sector;
		break;

	case 0x1f4:	/* cylinder low */
		temp = (uint8_t) (esdi->cylinder&0xff);
		break;

	case 0x1f5:	/* cylinder high */
		temp = (uint8_t) (esdi->cylinder>>8);
		break;

	case 0x1f6:	/* drive/Head */
		temp = (uint8_t) (esdi->head | (esdi->drive_sel ? 0x10 : 0) | 0xa0);
		break;

	case 0x1f7:	/* status */
		irq_lower(esdi);
		temp = esdi->status;
		break;
    }

    esdi_at_log("WD1007 read(%04x) = %02x\n", port, temp);

    return(temp);
}


static void
esdi_callback(void *priv)
{
    esdi_t *esdi = (esdi_t *)priv;
    drive_t *drive = &esdi->drives[esdi->drive_sel];
    off64_t addr;

    if (esdi->reset) {
	esdi->status = STAT_READY|STAT_DSC;
	esdi->error = 1;
	esdi->secount = 1;
	esdi->sector = 1;
	esdi->head = 0;
	esdi->cylinder = 0;
	esdi->reset = 0;

	ui_sb_update_icon(SB_HDD|HDD_BUS_ESDI, 0);
	return;
    }

    esdi_at_log("WD1007: command %02x on drive %i\n", esdi->command, esdi->drive_sel);

    switch (esdi->command) {
	case CMD_RESTORE:
		if (! drive->present) {
			esdi->status = STAT_READY|STAT_ERR|STAT_DSC;
			esdi->error = ERR_ABRT;
		} else {
			drive->current_cylinder = 0;
			esdi->status = STAT_READY|STAT_DSC;
		}
		irq_raise(esdi);
		break;

	case CMD_SEEK:
		if (! drive->present) {
			esdi->status = STAT_READY|STAT_ERR|STAT_DSC;
			esdi->error = ERR_ABRT;
		} else
			esdi->status = STAT_READY|STAT_DSC;
		irq_raise(esdi);
		break;

	case CMD_READ:
		if (! drive->present) {
			esdi->status = STAT_READY|STAT_ERR|STAT_DSC;
			esdi->error = ERR_ABRT;
			irq_raise(esdi);
		} else {
			if (get_sector(esdi, &addr)) {
				esdi->error = ERR_ID_NOT_FOUND;
				esdi->status = STAT_READY|STAT_DSC|STAT_ERR;
				irq_raise(esdi);
				break;
			}

			if (hdd_image_read_ex(drive->hdd_num, addr, 1, (uint8_t *)esdi->buffer)) {
				esdi->error = ERR_ID_NOT_FOUND;
				esdi->status = STAT_READY | STAT_DSC | STAT_ERR;
				irq_raise(esdi);
				break;
                        }

			esdi->pos = 0;
			esdi->status = STAT_DRQ|STAT_READY|STAT_DSC;
			irq_raise(esdi);
			ui_sb_update_icon(SB_HDD|HDD_BUS_ESDI, 1);
		}
		break;

	case CMD_WRITE:
		if (! drive->present) {
			esdi->status = STAT_READY|STAT_ERR|STAT_DSC;
			esdi->error = ERR_ABRT;
			irq_raise(esdi);
			break;
		} else {
			if (get_sector(esdi, &addr)) {
				esdi->error = ERR_ID_NOT_FOUND;
				esdi->status = STAT_READY|STAT_DSC|STAT_ERR;
				irq_raise(esdi);
				break;
			}

			if (hdd_image_write_ex(drive->hdd_num, addr, 1, (uint8_t *)esdi->buffer)) {
				esdi->error = ERR_ID_NOT_FOUND;
				esdi->status = STAT_READY | STAT_DSC | STAT_ERR;
				irq_raise(esdi);
				break;
			}

			irq_raise(esdi);
			esdi->secount = (esdi->secount - 1) & 0xff;
			if (esdi->secount) {
				esdi->status = STAT_DRQ|STAT_READY|STAT_DSC;
				esdi->pos = 0;
				next_sector(esdi);
			} else
				esdi->status = STAT_READY|STAT_DSC;
			ui_sb_update_icon(SB_HDD|HDD_BUS_ESDI, 1);
		}
		break;

	case CMD_VERIFY:
		if (! drive->present) {
			esdi->status = STAT_READY|STAT_ERR|STAT_DSC;
			esdi->error = ERR_ABRT;
			irq_raise(esdi);
			break;
		} else {
			if (get_sector(esdi, &addr)) {
				esdi->error = ERR_ID_NOT_FOUND;
				esdi->status = STAT_READY|STAT_DSC|STAT_ERR;
				irq_raise(esdi);
				break;
			}

			if (hdd_image_read_ex(drive->hdd_num, addr, 1, (uint8_t *)esdi->buffer)) {
				esdi->error = ERR_ID_NOT_FOUND;
				esdi->status = STAT_READY | STAT_DSC | STAT_ERR;
				irq_raise(esdi);
				break;
			}

			ui_sb_update_icon(SB_HDD|HDD_BUS_ESDI, 1);
			next_sector(esdi);
			esdi->secount = (esdi->secount - 1) & 0xff;
			if (esdi->secount)
				timer_set_delay_u64(&esdi->callback_timer, 6 * HDC_TIME);
			else {
				esdi->pos = 0;
				esdi->status = STAT_READY|STAT_DSC;
				irq_raise(esdi);
			}
		}
		break;

	case CMD_FORMAT:
		if (! drive->present) {
			esdi->status = STAT_READY|STAT_ERR|STAT_DSC;
			esdi->error = ERR_ABRT;
			irq_raise(esdi);
			break;
		} else {
			if (get_sector(esdi, &addr)) {
				esdi->error = ERR_ID_NOT_FOUND;
				esdi->status = STAT_READY|STAT_DSC|STAT_ERR;
				irq_raise(esdi);
				break;
			}

			if (hdd_image_zero_ex(drive->hdd_num, addr, esdi->secount)) {
				esdi->error = ERR_ID_NOT_FOUND;
				esdi->status = STAT_READY | STAT_DSC | STAT_ERR;
				irq_raise(esdi);
				break;
			}

			esdi->status = STAT_READY|STAT_DSC;
			irq_raise(esdi);
			ui_sb_update_icon(SB_HDD|HDD_BUS_ESDI, 1);
		}
		break;

	case CMD_DIAGNOSE:
		/* This is basically controller diagnostics - it resets drive select to 0,
		   and resets error and status to ready, DSC, and no error detected. */
		esdi->drive_sel = 0;
		drive = &esdi->drives[esdi->drive_sel];

		esdi->error = 1;	 /*no error detected*/
		esdi->status = STAT_READY|STAT_DSC;
		irq_raise(esdi);
		break;

	case CMD_SET_PARAMETERS: /* Initialize Drive Parameters */
		if (! drive->present) {
			esdi->status = STAT_READY|STAT_ERR|STAT_DSC;
			esdi->error = ERR_ABRT;
			irq_raise(esdi);
		} else {
			drive->cfg_spt = esdi->secount;
			drive->cfg_hpc = esdi->head+1;

			esdi_at_log("WD1007: parameters: spt=%i hpc=%i\n", drive->cfg_spt,drive->cfg_hpc);

			if (! esdi->secount)
				fatal("WD1007: secount=0\n");
			esdi->status = STAT_READY|STAT_DSC;
			irq_raise(esdi);
		}
		break;

	case CMD_NOP:
		esdi->status = STAT_READY|STAT_ERR|STAT_DSC;
		esdi->error = ERR_ABRT;
		irq_raise(esdi);
		break;

	case 0xe0:
		if (! drive->present) {
			esdi->status = STAT_READY|STAT_ERR|STAT_DSC;
			esdi->error = ERR_ABRT;
			irq_raise(esdi);
			break;
		} else {
			switch (esdi->cylinder >> 8) {
				case 0x31:
					esdi->cylinder = drive->real_tracks;
					break;

				case 0x33:
					esdi->cylinder = drive->real_hpc;
					break;

				case 0x35:
					esdi->cylinder = 0x200;
					break;

				case 0x36:
					esdi->cylinder = drive->real_spt;
					break;

				default:
					esdi_at_log("WD1007: bad read config %02x\n", esdi->cylinder >> 8);
			}
			esdi->status = STAT_READY|STAT_DSC;
			irq_raise(esdi);
		}
		break;

	case 0xa0:
		if (! drive->present) {
			esdi->status = STAT_READY|STAT_ERR|STAT_DSC;
			esdi->error = ERR_ABRT;
		} else {
			memset(esdi->buffer, 0x00, 512);
			memset(&esdi->buffer[3], 0xff, 512-6);
			esdi->pos = 0;
			esdi->status = STAT_DRQ|STAT_READY|STAT_DSC;
		}
		irq_raise(esdi);
		break;

	case CMD_READ_PARAMETERS:
		if (! drive->present) {
			esdi->status = STAT_READY|STAT_ERR|STAT_DSC;
			esdi->error = ERR_ABRT;
			irq_raise(esdi);
		} else {
			memset(esdi->buffer, 0x00, 512);
			esdi->buffer[0] = 0x44;	/* general configuration */
			esdi->buffer[1] = drive->real_tracks; /* number of non-removable cylinders */
			esdi->buffer[2] = 0;	/* number of removable cylinders */
			esdi->buffer[3] = drive->real_hpc;    /* number of heads */
			esdi->buffer[4] = 600;	/* number of unformatted bytes/sector */
			esdi->buffer[5] = esdi->buffer[4] * drive->real_spt; /* number of unformatted bytes/track */
			esdi->buffer[6] = drive->real_spt; /* number of sectors */
			esdi->buffer[7] = 0;	/*minimum bytes in inter-sector gap*/
			esdi->buffer[8] = 0;	/* minimum bytes in postamble */
			esdi->buffer[9] = 0;	/* number of words of vendor status */
			/* controller info */
			esdi->buffer[20] = 2; 	/* controller type */
			esdi->buffer[21] = 1;	/* sector buffer size, in sectors */
			esdi->buffer[22] = 0;	/* ecc bytes appended */
			esdi->buffer[27] = 'W' | ('D' << 8);
			esdi->buffer[28] = '1' | ('0' << 8);
			esdi->buffer[29] = '0' | ('7' << 8);
			esdi->buffer[30] = 'V' | ('-' << 8);
			esdi->buffer[31] = 'S' | ('E' << 8);
			esdi->buffer[32] = '1';
			esdi->buffer[47] = 0;	/* sectors per interrupt */
			esdi->buffer[48] = 0;	/* can use double word read/write? */
			esdi->pos = 0;
			esdi->status = STAT_DRQ|STAT_READY|STAT_DSC;
			irq_raise(esdi);
		}
		break;

	default:
		esdi_at_log("WD1007: callback on unknown command %02x\n", esdi->command);
		/*FALLTHROUGH*/

	case 0xe8:
		esdi->status = STAT_READY|STAT_ERR|STAT_DSC;
		esdi->error = ERR_ABRT;
		irq_raise(esdi);
		break;
    }

    ui_sb_update_icon(SB_HDD|HDD_BUS_ESDI, 0);
}


static void
loadhd(esdi_t *esdi, int hdd_num, int d, const wchar_t *fn)
{
    drive_t *drive = &esdi->drives[hdd_num];

    if (! hdd_image_load(d)) {
	esdi_at_log("WD1007: drive %d not present!\n", d);
	drive->present = 0;
	return;
    }

    drive->cfg_spt = drive->real_spt = hdd[d].spt;
    drive->cfg_hpc = drive->real_hpc = hdd[d].hpc;
    drive->real_tracks = hdd[d].tracks;
    drive->hdd_num = d;
    drive->present = 1;
}


static void
esdi_rom_write(uint32_t addr, uint8_t val, void *p)
{
    rom_t *rom = (rom_t *)p;

    addr &= rom->mask;

    if (addr >= 0x1f00 && addr < 0x2000)
	rom->rom[addr] = val;
}


static void *
wd1007vse1_init(const device_t *info)
{
    int c, d;

    esdi_t *esdi = malloc(sizeof(esdi_t));
    memset(esdi, 0x00, sizeof(esdi_t));

    c = 0;
    for (d=0; d<HDD_NUM; d++) {
	if ((hdd[d].bus==HDD_BUS_ESDI) && (hdd[d].esdi_channel<ESDI_NUM)) {
		loadhd(esdi, hdd[d].esdi_channel, d, hdd[d].fn);

		if (++c >= ESDI_NUM) break;
	}
    }

    esdi->status = STAT_READY|STAT_DSC;
    esdi->error = 1;

    rom_init(&esdi->bios_rom,
	     BIOS_FILE, 0xc8000, 0x4000, 0x3fff, 0, MEM_MAPPING_EXTERNAL);

    mem_mapping_set_handler(&esdi->bios_rom.mapping,
			    rom_read, rom_readw, rom_readl,
			    esdi_rom_write, NULL, NULL);

    io_sethandler(0x01f0, 1,
		  esdi_read, esdi_readw, NULL,
		  esdi_write, esdi_writew, NULL, esdi);
    io_sethandler(0x01f1, 7,
		  esdi_read, NULL, NULL,
		  esdi_write, NULL, NULL, esdi);
    io_sethandler(0x03f6, 1, NULL, NULL, NULL,
		  esdi_write, NULL, NULL, esdi);

    timer_add(&esdi->callback_timer, esdi_callback, esdi, 0);

    ui_sb_update_icon(SB_HDD | HDD_BUS_ESDI, 0);

    return(esdi);
}


static void
wd1007vse1_close(void *priv)
{
    esdi_t *esdi = (esdi_t *)priv;
    drive_t *drive;
    int d;

    for (d=0; d<2; d++) {
	drive = &esdi->drives[d];

	hdd_image_close(drive->hdd_num);
    }

    free(esdi);

    ui_sb_update_icon(SB_HDD | HDD_BUS_ESDI, 0);
}


static int
wd1007vse1_available(void)
{
    return(rom_present(BIOS_FILE));
}


const device_t esdi_at_wd1007vse1_device = {
    "Western Digital WD1007V-SE1 (ESDI)",
    DEVICE_ISA | DEVICE_AT,
    0,
    wd1007vse1_init, wd1007vse1_close, NULL,
    wd1007vse1_available,
    NULL, NULL,
    NULL
};