Commit 8977f3c1 authored by bellard's avatar bellard
Browse files

Floppy disk emulation (Jocelyn Mayer)


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@545 c046a42c-6fe2-441c-8c8c-71466251a162
parent 728c9fd5
/*
* QEMU Floppy disk emulator
*
* Copyright (c) 2003 Jocelyn Mayer
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include "cpu.h"
#include "vl.h"
/********************************************************/
/* debug Floppy devices */
//#define DEBUG_FLOPPY
#ifdef DEBUG_FLOPPY
#define FLOPPY_DPRINTF(fmt, args...) \
do { printf("FLOPPY: " fmt , ##args); } while (0)
#else
#define FLOPPY_DPRINTF(fmt, args...)
#endif
#define FLOPPY_ERROR(fmt, args...) \
do { printf("FLOPPY ERROR: %s: " fmt, __func__ , ##args); } while (0)
/********************************************************/
/* Floppy drive emulation */
/* Will always be a fixed parameter for us */
#define FD_SECTOR_LEN 512
#define FD_SECTOR_SC 2 /* Sector size code */
/* Floppy disk drive emulation */
typedef enum fdisk_type_t {
FDRIVE_DISK_288 = 0x01, /* 2.88 MB disk */
FDRIVE_DISK_144 = 0x02, /* 1.44 MB disk */
FDRIVE_DISK_720 = 0x03, /* 720 kB disk */
FDRIVE_DISK_NONE = 0x04, /* No disk */
} fdisk_type_t;
typedef enum fdrive_type_t {
FDRIVE_DRV_144 = 0x00, /* 1.44 MB 3"5 drive */
FDRIVE_DRV_288 = 0x01, /* 2.88 MB 3"5 drive */
FDRIVE_DRV_120 = 0x02, /* 1.2 MB 5"25 drive */
FDRIVE_DRV_NONE = 0x03, /* No drive connected */
} fdrive_type_t;
typedef struct fdrive_t {
BlockDriverState *bs;
/* Drive status */
fdrive_type_t drive;
uint8_t motor; /* on/off */
uint8_t perpendicular; /* 2.88 MB access mode */
uint8_t rv; /* Revalidated */
/* Position */
uint8_t head;
uint8_t track;
uint8_t sect;
/* Last operation status */
uint8_t dir; /* Direction */
uint8_t rw; /* Read/write */
/* Media */
fdisk_type_t disk; /* Disk type */
uint8_t last_sect; /* Nb sector per track */
uint8_t max_track; /* Nb of tracks */
uint8_t ro; /* Is read-only */
} fdrive_t;
static void fd_init (fdrive_t *drv)
{
/* Drive */
drv->bs = NULL;
// drv->drive = FDRIVE_DRV_288;
drv->drive = FDRIVE_DRV_144;
drv->motor = 0;
drv->perpendicular = 0;
drv->rv = 0;
/* Disk */
drv->disk = FDRIVE_DISK_NONE;
drv->last_sect = 1;
drv->max_track = 0;
}
static int _fd_sector (uint8_t head, uint8_t track,
uint8_t sect, uint8_t last_sect)
{
return (((track * 2) + head) * last_sect) + sect - 1;
}
/* Returns current position, in sectors, for given drive */
static int fd_sector (fdrive_t *drv)
{
return _fd_sector(drv->head, drv->track, drv->sect, drv->last_sect);
}
static int fd_seek (fdrive_t *drv, uint8_t head, uint8_t track, uint8_t sect,
int enable_seek)
{
uint32_t sector;
if (track > drv->max_track) {
FLOPPY_ERROR("try to read %d %02x %02x (max=%d %02x %02x)\n",
head, track, sect, 1, drv->max_track, drv->last_sect);
return 2;
}
if (sect > drv->last_sect) {
FLOPPY_ERROR("try to read %d %02x %02x (max=%d %02x %02x)\n",
head, track, sect, 1, drv->max_track, drv->last_sect);
return 3;
}
sector = _fd_sector(head, track, sect, drv->last_sect);
if (sector != fd_sector(drv)) {
#if 0
if (!enable_seek) {
FLOPPY_ERROR("no implicit seek %d %02x %02x (max=%d %02x %02x)\n",
head, track, sect, 1, drv->max_track, drv->last_sect);
return 4;
}
#endif
drv->head = head;
drv->track = track;
drv->sect = sect;
return 1;
}
return 0;
}
/* Set drive back to track 0 */
static void fd_recalibrate (fdrive_t *drv)
{
FLOPPY_DPRINTF("recalibrate\n");
drv->head = 0;
drv->track = 0;
drv->sect = 1;
drv->dir = 1;
drv->rw = 0;
}
/* Revalidate a disk drive after a disk change */
static void fd_revalidate (fdrive_t *drv, int ro)
{
int64_t nb_sectors;
FLOPPY_DPRINTF("revalidate\n");
drv->rv = 0;
if (drv->bs != NULL) {
bdrv_get_geometry(drv->bs, &nb_sectors);
#if 1
if (nb_sectors > 2880)
#endif
{
/* Pretend we have a 2.88 MB disk */
drv->disk = FDRIVE_DISK_288;
drv->last_sect = 36;
drv->max_track = 80;
#if 1
} else if (nb_sectors > 1440) {
/* Pretend we have a 1.44 MB disk */
drv->disk = FDRIVE_DISK_144;
drv->last_sect = 18;
drv->max_track = 80;
} else {
/* Pretend we have a 720 kB disk */
drv->disk = FDRIVE_DISK_720;
drv->last_sect = 9;
drv->max_track = 80;
#endif
}
} else {
drv->disk = FDRIVE_DISK_NONE;
drv->last_sect = 1; /* Avoid eventual divide by 0 bugs */
}
drv->ro = ro;
drv->rv = 1;
}
/* Motor control */
static void fd_start (fdrive_t *drv)
{
drv->motor = 1;
}
static void fd_stop (fdrive_t *drv)
{
drv->motor = 0;
}
/* Re-initialise a drives (motor off, repositioned) */
static void fd_reset (fdrive_t *drv)
{
fd_stop(drv);
fd_recalibrate(drv);
}
/********************************************************/
/* Intel 82078 floppy disk controler emulation */
static void fdctrl_reset (int do_irq);
static void fdctrl_reset_fifo (void);
static int fdctrl_transfer_handler (uint32_t addr, int size, int *irq);
static int fdctrl_misc_handler (int duknwo);
static void fdctrl_raise_irq (uint8_t status);
static uint32_t fdctrl_read_statusB (CPUState *env, uint32_t reg);
static uint32_t fdctrl_read_dor (CPUState *env, uint32_t reg);
static void fdctrl_write_dor (CPUState *env, uint32_t reg, uint32_t value);
static uint32_t fdctrl_read_tape (CPUState *env, uint32_t reg);
static void fdctrl_write_tape (CPUState *env, uint32_t reg, uint32_t value);
static uint32_t fdctrl_read_main_status (CPUState *env, uint32_t reg);
static void fdctrl_write_rate (CPUState *env, uint32_t reg, uint32_t value);
static uint32_t fdctrl_read_data (CPUState *env, uint32_t reg);
static void fdctrl_write_data (CPUState *env, uint32_t reg, uint32_t value);
static uint32_t fdctrl_read_dir (CPUState *env, uint32_t reg);
enum {
FD_CTRL_ACTIVE = 0x01,
FD_CTRL_RESET = 0x02,
FD_CTRL_SLEEP = 0x04,
FD_CTRL_BUSY = 0x08,
FD_CTRL_INTR = 0x10,
};
enum {
FD_DIR_WRITE = 0,
FD_DIR_READ = 1,
FD_DIR_SCANE = 2,
FD_DIR_SCANL = 3,
FD_DIR_SCANH = 4,
};
enum {
FD_STATE_CMD = 0x00,
FD_STATE_STATUS = 0x01,
FD_STATE_DATA = 0x02,
FD_STATE_STATE = 0x03,
FD_STATE_MULTI = 0x10,
FD_STATE_SEEK = 0x20,
};
#define FD_STATE(state) ((state) & FD_STATE_STATE)
#define FD_MULTI_TRACK(state) ((state) & FD_STATE_MULTI)
#define FD_DID_SEEK(state) ((state) & FD_STATE_SEEK)
typedef struct fdctrl_t {
/* Controler's identification */
uint8_t version;
/* HW */
int irq_lvl;
int dma_chann;
/* Controler state */
uint8_t state;
uint8_t dma_en;
uint8_t cur_drv;
uint8_t bootsel;
/* Command FIFO */
uint8_t fifo[FD_SECTOR_LEN];
uint32_t data_pos;
uint32_t data_len;
uint8_t data_state;
uint8_t data_dir;
uint8_t int_status;
/* States kept only to be returned back */
/* Timers state */
uint8_t timer0;
uint8_t timer1;
/* precompensation */
uint8_t precomp_trk;
uint8_t config;
uint8_t lock;
/* Power down config (also with status regB access mode */
uint8_t pwrd;
/* Floppy drives */
fdrive_t drives[2];
} fdctrl_t;
static fdctrl_t fdctrl;
void fdctrl_init (int irq_lvl, int dma_chann, int mem_mapped, uint32_t base,
char boot_device)
{
// int io_mem;
int i;
FLOPPY_DPRINTF("init controler\n");
memset(&fdctrl, 0, sizeof(fdctrl));
fdctrl.version = 0x90; /* Intel 82078 controler */
fdctrl.irq_lvl = irq_lvl;
fdctrl.dma_chann = dma_chann;
fdctrl.config = 0x40; /* Implicit seek, polling & FIFO enabled */
if (fdctrl.dma_chann != -1) {
fdctrl.dma_en = 1;
DMA_register_channel(dma_chann, &fdctrl_transfer_handler,
&fdctrl_misc_handler);
} else {
fdctrl.dma_en = 0;
}
for (i = 0; i < MAX_FD; i++)
fd_init(&fdctrl.drives[i]);
fdctrl_reset(0);
fdctrl.state = FD_CTRL_ACTIVE;
if (mem_mapped) {
FLOPPY_ERROR("memory mapped floppy not supported by now !\n");
#if 0
io_mem = cpu_register_io_memory(0, fdctrl_mem_read, fdctrl_mem_write);
cpu_register_physical_memory(base, 0x08, io_mem);
#endif
} else {
register_ioport_read(base + 0x01, 1, fdctrl_read_statusB, 1);
register_ioport_read(base + 0x02, 1, fdctrl_read_dor, 1);
register_ioport_write(base + 0x02, 1, fdctrl_write_dor, 1);
register_ioport_read(base + 0x03, 1, fdctrl_read_tape, 1);
register_ioport_write(base + 0x03, 1, fdctrl_write_tape, 1);
register_ioport_read(base + 0x04, 1, fdctrl_read_main_status, 1);
register_ioport_write(base + 0x04, 1, fdctrl_write_rate, 1);
register_ioport_read(base + 0x05, 1, fdctrl_read_data, 1);
register_ioport_write(base + 0x05, 1, fdctrl_write_data, 1);
register_ioport_read(base + 0x07, 1, fdctrl_read_dir, 1);
}
if (boot_device == 'b')
fdctrl.bootsel = 1;
else
fdctrl.bootsel = 0;
#if defined (TARGET_I386)
cmos_register_fd(fdctrl.drives[0].drive, fdctrl.drives[1].drive);
#endif
}
int fdctrl_disk_change (int idx, const unsigned char *filename, int ro)
{
fdrive_t *drv;
if (idx < 0 || idx > 1)
return -1;
FLOPPY_DPRINTF("disk %d change: %s (%s)\n", idx, filename,
ro == 0 ? "rw" : "ro");
drv = &fdctrl.drives[idx];
if (fd_table[idx] != NULL) {
bdrv_close(fd_table[idx]);
fd_table[idx] = NULL;
}
fd_table[idx] = bdrv_open(filename, ro);
drv->bs = fd_table[idx];
if (fd_table[idx] == NULL)
return -1;
fd_revalidate(drv, ro);
#if 0
fd_recalibrate(drv);
fdctrl_reset_fifo();
fdctrl_raise_irq(0x20);
#endif
return 0;
}
/* Change IRQ state */
static void fdctrl_reset_irq (void)
{
if (fdctrl.state & FD_CTRL_INTR) {
pic_set_irq(fdctrl.irq_lvl, 0);
fdctrl.state &= ~(FD_CTRL_INTR | FD_CTRL_SLEEP | FD_CTRL_BUSY);
}
}
static void fdctrl_raise_irq (uint8_t status)
{
if (~(fdctrl.state & FD_CTRL_INTR)) {
pic_set_irq(fdctrl.irq_lvl, 1);
fdctrl.state |= FD_CTRL_INTR;
}
FLOPPY_DPRINTF("Set interrupt status to 0x%02x\n", status);
fdctrl.int_status = status;
}
/* Reset controler */
static void fdctrl_reset (int do_irq)
{
int i;
FLOPPY_DPRINTF("reset controler\n");
fdctrl_reset_irq();
/* Initialise controler */
fdctrl.cur_drv = 0;
/* FIFO state */
fdctrl.data_pos = 0;
fdctrl.data_len = 0;
fdctrl.data_state = FD_STATE_CMD;
fdctrl.data_dir = FD_DIR_WRITE;
for (i = 0; i < MAX_FD; i++)
fd_reset(&fdctrl.drives[i]);
fdctrl_reset_fifo();
if (do_irq)
fdctrl_raise_irq(0x20);
}
/* Status B register : 0x01 (read-only) */
static uint32_t fdctrl_read_statusB (CPUState *env, uint32_t reg)
{
fdctrl_reset_irq();
FLOPPY_DPRINTF("status register: 0x00\n");
return 0;
}
/* Digital output register : 0x02 */
static uint32_t fdctrl_read_dor (CPUState *env, uint32_t reg)
{
fdrive_t *cur_drv, *drv0, *drv1;
uint32_t retval = 0;
drv0 = &fdctrl.drives[fdctrl.bootsel];
drv1 = &fdctrl.drives[1 - fdctrl.bootsel];
cur_drv = fdctrl.cur_drv == 0 ? drv0 : drv1;
/* Drive motors state indicators */
retval |= drv1->motor << 5;
retval |= drv0->motor << 4;
/* DMA enable */
retval |= fdctrl.dma_en << 3;
/* Reset indicator */
retval |= (fdctrl.state & FD_CTRL_RESET) == 0 ? 0x04 : 0;
/* Selected drive */
retval |= fdctrl.cur_drv;
FLOPPY_DPRINTF("digital output register: 0x%02x\n", retval);
return retval;
}
static void fdctrl_write_dor (CPUState *env, uint32_t reg, uint32_t value)
{
fdrive_t *drv0, *drv1;
fdctrl_reset_irq();
drv0 = &fdctrl.drives[fdctrl.bootsel];
drv1 = &fdctrl.drives[1 - fdctrl.bootsel];
/* Reset mode */
if (fdctrl.state & FD_CTRL_RESET) {
if (!(value & 0x04)) {
FLOPPY_DPRINTF("Floppy controler in RESET state !\n");
return;
}
}
FLOPPY_DPRINTF("digital output register set to 0x%02x\n", value);
/* Drive motors state indicators */
if (value & 0x20)
fd_start(drv1);
else
fd_stop(drv1);
if (value & 0x10)
fd_start(drv0);
else
fd_stop(drv0);
/* DMA enable */
#if 0
if (fdctrl.dma_chann != -1)
fdctrl.dma_en = 1 - ((value >> 3) & 1);
#endif
/* Reset */
if (!(value & 0x04)) {
if (!(fdctrl.state & FD_CTRL_RESET)) {
FLOPPY_DPRINTF("controler enter RESET state\n");
fdctrl.state |= FD_CTRL_RESET;
fdctrl_reset(1);
}
} else {
if (fdctrl.state & FD_CTRL_RESET) {
FLOPPY_DPRINTF("controler out of RESET state\n");
fdctrl.state &= ~(FD_CTRL_RESET | FD_CTRL_SLEEP);
}
}
/* Selected drive */
fdctrl.cur_drv = value & 1;
}
/* Tape drive register : 0x03 */
static uint32_t fdctrl_read_tape (CPUState *env, uint32_t reg)
{
uint32_t retval = 0;
fdctrl_reset_irq();
/* Disk boot selection indicator */
retval |= fdctrl.bootsel << 2;
/* Tape indicators: never allowed */
FLOPPY_DPRINTF("tape drive register: 0x%02x\n", retval);
return retval;
}
static void fdctrl_write_tape (CPUState *env, uint32_t reg, uint32_t value)
{
fdctrl_reset_irq();
/* Reset mode */
if (fdctrl.state & FD_CTRL_RESET) {
FLOPPY_DPRINTF("Floppy controler in RESET state !\n");
return;
}
FLOPPY_DPRINTF("tape drive register set to 0x%02x\n", value);
/* Disk boot selection indicator */
fdctrl.bootsel = (value >> 2) & 1;
/* Tape indicators: never allow */
}
/* Main status register : 0x04 (read) */
static uint32_t fdctrl_read_main_status (CPUState *env, uint32_t reg)
{
uint32_t retval = 0;
fdctrl_reset_irq();
fdctrl.state &= ~(FD_CTRL_SLEEP | FD_CTRL_RESET);
if (!(fdctrl.state & FD_CTRL_BUSY)) {
/* Data transfer allowed */
retval |= 0x80;
/* Data transfer direction indicator */
if (fdctrl.data_dir == FD_DIR_READ)
retval |= 0x40;
}
/* Should handle 0x20 for SPECIFY command */
/* Command busy indicator */
if (FD_STATE(fdctrl.data_state) == FD_STATE_DATA ||
FD_STATE(fdctrl.data_state) == FD_STATE_STATUS)
retval |= 0x10;
FLOPPY_DPRINTF("main status register: 0x%02x\n", retval);
return retval;
}
/* Data select rate register : 0x04 (write) */
static void fdctrl_write_rate (CPUState *env, uint32_t reg, uint32_t value)
{
fdctrl_reset_irq();
/* Reset mode */
if (fdctrl.state & FD_CTRL_RESET) {
if (reg != 0x2 || !(value & 0x04)) {
FLOPPY_DPRINTF("Floppy controler in RESET state !\n");
return;
}
}
FLOPPY_DPRINTF("select rate register set to 0x%02x\n", value);
/* Reset: autoclear */
if (value & 0x80) {
fdctrl.state |= FD_CTRL_RESET;
fdctrl_reset(1);
fdctrl.state &= ~FD_CTRL_RESET;
}
if (value & 0x40) {
fdctrl.state |= FD_CTRL_SLEEP;
fdctrl_reset(1);
}
// fdctrl.precomp = (value >> 2) & 0x07;
}
/* Digital input register : 0x07 (read-only) */
static uint32_t fdctrl_read_dir (CPUState *env, uint32_t reg)
{
fdrive_t *drv0, *drv1;
uint32_t retval = 0;
fdctrl_reset_irq();
drv0 = &fdctrl.drives[fdctrl.bootsel];
drv1 = &fdctrl.drives[1 - fdctrl.bootsel];
if (drv0->rv || drv1->rv)
retval |= 0x80;
if (retval != 0)
FLOPPY_ERROR("Floppy digital input register: 0x%02x\n", retval);
drv0->rv = 0;
drv1->rv = 0;
return retval;
}
/* FIFO state control */
static void fdctrl_reset_fifo (void)
{
fdctrl.data_dir = FD_DIR_WRITE;
fdctrl.data_pos = 0;
fdctrl.data_state = FD_STATE_CMD;
}
/* Set FIFO status for the host to read */
static void fdctrl_set_fifo (int fifo_len, int do_irq)
{
fdctrl.data_dir = FD_DIR_READ;
fdctrl.data_len = fifo_len;
fdctrl.data_pos = 0;
fdctrl.data_state = FD_STATE_STATUS;
if (do_irq)
fdctrl_raise_irq(0x00);
}
/* Set an error: unimplemented/unknown command */
static void fdctrl_unimplemented (void)
{
#if 0
fdrive_t *cur_drv, *drv0, *drv1;
drv0 = &fdctrl.drives[fdctrl.bootsel];
drv1 = &fdctrl.drives[1 - fdctrl.bootsel];
cur_drv = fdctrl.cur_drv == 0 ? drv0 : drv1;
fdctrl.fifo[0] = 0x60 | (cur_drv->head << 1) | fdctrl.cur_drv;
fdctrl.fifo[1] = 0x00;
fdctrl.fifo[2] = 0x00;
fdctrl_set_fifo(3, 1);
#else
fdctrl_reset_fifo();
#endif
}
/* Callback for transfer end (stop or abort) */
static void fdctrl_stop_transfer (uint8_t status0, uint8_t status1,
uint8_t status2)
{
fdrive_t *cur_drv, *drv0, *drv1;
drv0 = &fdctrl.drives[fdctrl.bootsel];
drv1 = &fdctrl.drives[1 - fdctrl.bootsel];
cur_drv = fdctrl.cur_drv == 0 ? drv0 : drv1;
FLOPPY_DPRINTF("transfer status: %02x %02x %02x (%02x)\n",
status0, status1, status2,
status0 | (cur_drv->head << 1) |