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fdc.c
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fdc.c
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/*
* QEMU Floppy disk emulator (Intel 82078)
*
* Copyright (c) 2003, 2007 Jocelyn Mayer
* Copyright (c) 2008 Hervé Poussineau
*
* 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.
*/
/*
* The controller is used in Sun4m systems in a slightly different
* way. There are changes in DOR register and DMA is not available.
*/
#include "hw.h"
#include "fdc.h"
#include "qemu-error.h"
#include "qemu-timer.h"
#include "isa.h"
#include "sysbus.h"
#include "qdev-addr.h"
#include "blockdev.h"
#include "sysemu.h"
/********************************************************/
/* debug Floppy devices */
//#define DEBUG_FLOPPY
#ifdef DEBUG_FLOPPY
#define FLOPPY_DPRINTF(fmt, ...) \
do { printf("FLOPPY: " fmt , ## __VA_ARGS__); } while (0)
#else
#define FLOPPY_DPRINTF(fmt, ...)
#endif
#define FLOPPY_ERROR(fmt, ...) \
do { printf("FLOPPY ERROR: %s: " fmt, __func__ , ## __VA_ARGS__); } while (0)
/********************************************************/
/* Floppy drive emulation */
#define GET_CUR_DRV(fdctrl) ((fdctrl)->cur_drv)
#define SET_CUR_DRV(fdctrl, drive) ((fdctrl)->cur_drv = (drive))
/* Will always be a fixed parameter for us */
#define FD_SECTOR_LEN 512
#define FD_SECTOR_SC 2 /* Sector size code */
#define FD_RESET_SENSEI_COUNT 4 /* Number of sense interrupts on RESET */
/* Floppy disk drive emulation */
typedef enum FDiskType {
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_USER = 0x04, /* User defined geometry */
FDRIVE_DISK_NONE = 0x05, /* No disk */
} FDiskType;
typedef enum FDriveType {
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 */
} FDriveType;
typedef enum FDiskFlags {
FDISK_DBL_SIDES = 0x01,
} FDiskFlags;
typedef struct FDrive {
BlockDriverState *bs;
/* Drive status */
FDriveType drive;
uint8_t perpendicular; /* 2.88 MB access mode */
/* Position */
uint8_t head;
uint8_t track;
uint8_t sect;
/* Media */
FDiskFlags flags;
uint8_t last_sect; /* Nb sector per track */
uint8_t max_track; /* Nb of tracks */
uint16_t bps; /* Bytes per sector */
uint8_t ro; /* Is read-only */
} FDrive;
static void fd_init(FDrive *drv)
{
/* Drive */
drv->drive = FDRIVE_DRV_NONE;
drv->perpendicular = 0;
/* Disk */
drv->last_sect = 0;
drv->max_track = 0;
}
static int fd_sector_calc(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 *drv)
{
return fd_sector_calc(drv->head, drv->track, drv->sect, drv->last_sect);
}
/* Seek to a new position:
* returns 0 if already on right track
* returns 1 if track changed
* returns 2 if track is invalid
* returns 3 if sector is invalid
* returns 4 if seek is disabled
*/
static int fd_seek(FDrive *drv, uint8_t head, uint8_t track, uint8_t sect,
int enable_seek)
{
uint32_t sector;
int ret;
if (track > drv->max_track ||
(head != 0 && (drv->flags & FDISK_DBL_SIDES) == 0)) {
FLOPPY_DPRINTF("try to read %d %02x %02x (max=%d %d %02x %02x)\n",
head, track, sect, 1,
(drv->flags & FDISK_DBL_SIDES) == 0 ? 0 : 1,
drv->max_track, drv->last_sect);
return 2;
}
if (sect > drv->last_sect) {
FLOPPY_DPRINTF("try to read %d %02x %02x (max=%d %d %02x %02x)\n",
head, track, sect, 1,
(drv->flags & FDISK_DBL_SIDES) == 0 ? 0 : 1,
drv->max_track, drv->last_sect);
return 3;
}
sector = fd_sector_calc(head, track, sect, drv->last_sect);
ret = 0;
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;
if (drv->track != track)
ret = 1;
drv->track = track;
drv->sect = sect;
}
return ret;
}
/* Set drive back to track 0 */
static void fd_recalibrate(FDrive *drv)
{
FLOPPY_DPRINTF("recalibrate\n");
drv->head = 0;
drv->track = 0;
drv->sect = 1;
}
/* Recognize floppy formats */
typedef struct FDFormat {
FDriveType drive;
FDiskType disk;
uint8_t last_sect;
uint8_t max_track;
uint8_t max_head;
const char *str;
} FDFormat;
static const FDFormat fd_formats[] = {
/* First entry is default format */
/* 1.44 MB 3"1/2 floppy disks */
{ FDRIVE_DRV_144, FDRIVE_DISK_144, 18, 80, 1, "1.44 MB 3\"1/2", },
{ FDRIVE_DRV_144, FDRIVE_DISK_144, 20, 80, 1, "1.6 MB 3\"1/2", },
{ FDRIVE_DRV_144, FDRIVE_DISK_144, 21, 80, 1, "1.68 MB 3\"1/2", },
{ FDRIVE_DRV_144, FDRIVE_DISK_144, 21, 82, 1, "1.72 MB 3\"1/2", },
{ FDRIVE_DRV_144, FDRIVE_DISK_144, 21, 83, 1, "1.74 MB 3\"1/2", },
{ FDRIVE_DRV_144, FDRIVE_DISK_144, 22, 80, 1, "1.76 MB 3\"1/2", },
{ FDRIVE_DRV_144, FDRIVE_DISK_144, 23, 80, 1, "1.84 MB 3\"1/2", },
{ FDRIVE_DRV_144, FDRIVE_DISK_144, 24, 80, 1, "1.92 MB 3\"1/2", },
/* 2.88 MB 3"1/2 floppy disks */
{ FDRIVE_DRV_288, FDRIVE_DISK_288, 36, 80, 1, "2.88 MB 3\"1/2", },
{ FDRIVE_DRV_288, FDRIVE_DISK_288, 39, 80, 1, "3.12 MB 3\"1/2", },
{ FDRIVE_DRV_288, FDRIVE_DISK_288, 40, 80, 1, "3.2 MB 3\"1/2", },
{ FDRIVE_DRV_288, FDRIVE_DISK_288, 44, 80, 1, "3.52 MB 3\"1/2", },
{ FDRIVE_DRV_288, FDRIVE_DISK_288, 48, 80, 1, "3.84 MB 3\"1/2", },
/* 720 kB 3"1/2 floppy disks */
{ FDRIVE_DRV_144, FDRIVE_DISK_720, 9, 80, 1, "720 kB 3\"1/2", },
{ FDRIVE_DRV_144, FDRIVE_DISK_720, 10, 80, 1, "800 kB 3\"1/2", },
{ FDRIVE_DRV_144, FDRIVE_DISK_720, 10, 82, 1, "820 kB 3\"1/2", },
{ FDRIVE_DRV_144, FDRIVE_DISK_720, 10, 83, 1, "830 kB 3\"1/2", },
{ FDRIVE_DRV_144, FDRIVE_DISK_720, 13, 80, 1, "1.04 MB 3\"1/2", },
{ FDRIVE_DRV_144, FDRIVE_DISK_720, 14, 80, 1, "1.12 MB 3\"1/2", },
/* 1.2 MB 5"1/4 floppy disks */
{ FDRIVE_DRV_120, FDRIVE_DISK_288, 15, 80, 1, "1.2 kB 5\"1/4", },
{ FDRIVE_DRV_120, FDRIVE_DISK_288, 18, 80, 1, "1.44 MB 5\"1/4", },
{ FDRIVE_DRV_120, FDRIVE_DISK_288, 18, 82, 1, "1.48 MB 5\"1/4", },
{ FDRIVE_DRV_120, FDRIVE_DISK_288, 18, 83, 1, "1.49 MB 5\"1/4", },
{ FDRIVE_DRV_120, FDRIVE_DISK_288, 20, 80, 1, "1.6 MB 5\"1/4", },
/* 720 kB 5"1/4 floppy disks */
{ FDRIVE_DRV_120, FDRIVE_DISK_288, 9, 80, 1, "720 kB 5\"1/4", },
{ FDRIVE_DRV_120, FDRIVE_DISK_288, 11, 80, 1, "880 kB 5\"1/4", },
/* 360 kB 5"1/4 floppy disks */
{ FDRIVE_DRV_120, FDRIVE_DISK_288, 9, 40, 1, "360 kB 5\"1/4", },
{ FDRIVE_DRV_120, FDRIVE_DISK_288, 9, 40, 0, "180 kB 5\"1/4", },
{ FDRIVE_DRV_120, FDRIVE_DISK_288, 10, 41, 1, "410 kB 5\"1/4", },
{ FDRIVE_DRV_120, FDRIVE_DISK_288, 10, 42, 1, "420 kB 5\"1/4", },
/* 320 kB 5"1/4 floppy disks */
{ FDRIVE_DRV_120, FDRIVE_DISK_288, 8, 40, 1, "320 kB 5\"1/4", },
{ FDRIVE_DRV_120, FDRIVE_DISK_288, 8, 40, 0, "160 kB 5\"1/4", },
/* 360 kB must match 5"1/4 better than 3"1/2... */
{ FDRIVE_DRV_144, FDRIVE_DISK_720, 9, 80, 0, "360 kB 3\"1/2", },
/* end */
{ FDRIVE_DRV_NONE, FDRIVE_DISK_NONE, -1, -1, 0, NULL, },
};
/* Revalidate a disk drive after a disk change */
static void fd_revalidate(FDrive *drv)
{
const FDFormat *parse;
uint64_t nb_sectors, size;
int i, first_match, match;
int nb_heads, max_track, last_sect, ro;
FLOPPY_DPRINTF("revalidate\n");
if (drv->bs != NULL && bdrv_is_inserted(drv->bs)) {
ro = bdrv_is_read_only(drv->bs);
bdrv_get_geometry_hint(drv->bs, &nb_heads, &max_track, &last_sect);
if (nb_heads != 0 && max_track != 0 && last_sect != 0) {
FLOPPY_DPRINTF("User defined disk (%d %d %d)",
nb_heads - 1, max_track, last_sect);
} else {
bdrv_get_geometry(drv->bs, &nb_sectors);
match = -1;
first_match = -1;
for (i = 0;; i++) {
parse = &fd_formats[i];
if (parse->drive == FDRIVE_DRV_NONE)
break;
if (drv->drive == parse->drive ||
drv->drive == FDRIVE_DRV_NONE) {
size = (parse->max_head + 1) * parse->max_track *
parse->last_sect;
if (nb_sectors == size) {
match = i;
break;
}
if (first_match == -1)
first_match = i;
}
}
if (match == -1) {
if (first_match == -1)
match = 1;
else
match = first_match;
parse = &fd_formats[match];
}
nb_heads = parse->max_head + 1;
max_track = parse->max_track;
last_sect = parse->last_sect;
drv->drive = parse->drive;
FLOPPY_DPRINTF("%s floppy disk (%d h %d t %d s) %s\n", parse->str,
nb_heads, max_track, last_sect, ro ? "ro" : "rw");
}
if (nb_heads == 1) {
drv->flags &= ~FDISK_DBL_SIDES;
} else {
drv->flags |= FDISK_DBL_SIDES;
}
drv->max_track = max_track;
drv->last_sect = last_sect;
drv->ro = ro;
} else {
FLOPPY_DPRINTF("No disk in drive\n");
drv->last_sect = 0;
drv->max_track = 0;
drv->flags &= ~FDISK_DBL_SIDES;
}
}
/********************************************************/
/* Intel 82078 floppy disk controller emulation */
static void fdctrl_reset(FDCtrl *fdctrl, int do_irq);
static void fdctrl_reset_fifo(FDCtrl *fdctrl);
static int fdctrl_transfer_handler (void *opaque, int nchan,
int dma_pos, int dma_len);
static void fdctrl_raise_irq(FDCtrl *fdctrl, uint8_t status0);
static uint32_t fdctrl_read_statusA(FDCtrl *fdctrl);
static uint32_t fdctrl_read_statusB(FDCtrl *fdctrl);
static uint32_t fdctrl_read_dor(FDCtrl *fdctrl);
static void fdctrl_write_dor(FDCtrl *fdctrl, uint32_t value);
static uint32_t fdctrl_read_tape(FDCtrl *fdctrl);
static void fdctrl_write_tape(FDCtrl *fdctrl, uint32_t value);
static uint32_t fdctrl_read_main_status(FDCtrl *fdctrl);
static void fdctrl_write_rate(FDCtrl *fdctrl, uint32_t value);
static uint32_t fdctrl_read_data(FDCtrl *fdctrl);
static void fdctrl_write_data(FDCtrl *fdctrl, uint32_t value);
static uint32_t fdctrl_read_dir(FDCtrl *fdctrl);
enum {
FD_DIR_WRITE = 0,
FD_DIR_READ = 1,
FD_DIR_SCANE = 2,
FD_DIR_SCANL = 3,
FD_DIR_SCANH = 4,
};
enum {
FD_STATE_MULTI = 0x01, /* multi track flag */
FD_STATE_FORMAT = 0x02, /* format flag */
FD_STATE_SEEK = 0x04, /* seek flag */
};
enum {
FD_REG_SRA = 0x00,
FD_REG_SRB = 0x01,
FD_REG_DOR = 0x02,
FD_REG_TDR = 0x03,
FD_REG_MSR = 0x04,
FD_REG_DSR = 0x04,
FD_REG_FIFO = 0x05,
FD_REG_DIR = 0x07,
};
enum {
FD_CMD_READ_TRACK = 0x02,
FD_CMD_SPECIFY = 0x03,
FD_CMD_SENSE_DRIVE_STATUS = 0x04,
FD_CMD_WRITE = 0x05,
FD_CMD_READ = 0x06,
FD_CMD_RECALIBRATE = 0x07,
FD_CMD_SENSE_INTERRUPT_STATUS = 0x08,
FD_CMD_WRITE_DELETED = 0x09,
FD_CMD_READ_ID = 0x0a,
FD_CMD_READ_DELETED = 0x0c,
FD_CMD_FORMAT_TRACK = 0x0d,
FD_CMD_DUMPREG = 0x0e,
FD_CMD_SEEK = 0x0f,
FD_CMD_VERSION = 0x10,
FD_CMD_SCAN_EQUAL = 0x11,
FD_CMD_PERPENDICULAR_MODE = 0x12,
FD_CMD_CONFIGURE = 0x13,
FD_CMD_LOCK = 0x14,
FD_CMD_VERIFY = 0x16,
FD_CMD_POWERDOWN_MODE = 0x17,
FD_CMD_PART_ID = 0x18,
FD_CMD_SCAN_LOW_OR_EQUAL = 0x19,
FD_CMD_SCAN_HIGH_OR_EQUAL = 0x1d,
FD_CMD_SAVE = 0x2e,
FD_CMD_OPTION = 0x33,
FD_CMD_RESTORE = 0x4e,
FD_CMD_DRIVE_SPECIFICATION_COMMAND = 0x8e,
FD_CMD_RELATIVE_SEEK_OUT = 0x8f,
FD_CMD_FORMAT_AND_WRITE = 0xcd,
FD_CMD_RELATIVE_SEEK_IN = 0xcf,
};
enum {
FD_CONFIG_PRETRK = 0xff, /* Pre-compensation set to track 0 */
FD_CONFIG_FIFOTHR = 0x0f, /* FIFO threshold set to 1 byte */
FD_CONFIG_POLL = 0x10, /* Poll enabled */
FD_CONFIG_EFIFO = 0x20, /* FIFO disabled */
FD_CONFIG_EIS = 0x40, /* No implied seeks */
};
enum {
FD_SR0_EQPMT = 0x10,
FD_SR0_SEEK = 0x20,
FD_SR0_ABNTERM = 0x40,
FD_SR0_INVCMD = 0x80,
FD_SR0_RDYCHG = 0xc0,
};
enum {
FD_SR1_EC = 0x80, /* End of cylinder */
};
enum {
FD_SR2_SNS = 0x04, /* Scan not satisfied */
FD_SR2_SEH = 0x08, /* Scan equal hit */
};
enum {
FD_SRA_DIR = 0x01,
FD_SRA_nWP = 0x02,
FD_SRA_nINDX = 0x04,
FD_SRA_HDSEL = 0x08,
FD_SRA_nTRK0 = 0x10,
FD_SRA_STEP = 0x20,
FD_SRA_nDRV2 = 0x40,
FD_SRA_INTPEND = 0x80,
};
enum {
FD_SRB_MTR0 = 0x01,
FD_SRB_MTR1 = 0x02,
FD_SRB_WGATE = 0x04,
FD_SRB_RDATA = 0x08,
FD_SRB_WDATA = 0x10,
FD_SRB_DR0 = 0x20,
};
enum {
#if MAX_FD == 4
FD_DOR_SELMASK = 0x03,
#else
FD_DOR_SELMASK = 0x01,
#endif
FD_DOR_nRESET = 0x04,
FD_DOR_DMAEN = 0x08,
FD_DOR_MOTEN0 = 0x10,
FD_DOR_MOTEN1 = 0x20,
FD_DOR_MOTEN2 = 0x40,
FD_DOR_MOTEN3 = 0x80,
};
enum {
#if MAX_FD == 4
FD_TDR_BOOTSEL = 0x0c,
#else
FD_TDR_BOOTSEL = 0x04,
#endif
};
enum {
FD_DSR_DRATEMASK= 0x03,
FD_DSR_PWRDOWN = 0x40,
FD_DSR_SWRESET = 0x80,
};
enum {
FD_MSR_DRV0BUSY = 0x01,
FD_MSR_DRV1BUSY = 0x02,
FD_MSR_DRV2BUSY = 0x04,
FD_MSR_DRV3BUSY = 0x08,
FD_MSR_CMDBUSY = 0x10,
FD_MSR_NONDMA = 0x20,
FD_MSR_DIO = 0x40,
FD_MSR_RQM = 0x80,
};
enum {
FD_DIR_DSKCHG = 0x80,
};
#define FD_MULTI_TRACK(state) ((state) & FD_STATE_MULTI)
#define FD_DID_SEEK(state) ((state) & FD_STATE_SEEK)
#define FD_FORMAT_CMD(state) ((state) & FD_STATE_FORMAT)
struct FDCtrl {
/* Controller's identification */
uint8_t version;
/* HW */
qemu_irq irq;
int dma_chann;
/* Controller state */
QEMUTimer *result_timer;
uint8_t sra;
uint8_t srb;
uint8_t dor;
uint8_t dor_vmstate; /* only used as temp during vmstate */
uint8_t tdr;
uint8_t dsr;
uint8_t msr;
uint8_t cur_drv;
uint8_t status0;
uint8_t status1;
uint8_t status2;
/* Command FIFO */
uint8_t *fifo;
int32_t fifo_size;
uint32_t data_pos;
uint32_t data_len;
uint8_t data_state;
uint8_t data_dir;
uint8_t eot; /* last wanted sector */
/* 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;
/* Sun4m quirks? */
int sun4m;
/* Floppy drives */
uint8_t num_floppies;
FDrive drives[MAX_FD];
int reset_sensei;
};
typedef struct FDCtrlSysBus {
SysBusDevice busdev;
struct FDCtrl state;
} FDCtrlSysBus;
typedef struct FDCtrlISABus {
ISADevice busdev;
struct FDCtrl state;
int32_t bootindexA;
int32_t bootindexB;
} FDCtrlISABus;
static uint32_t fdctrl_read (void *opaque, uint32_t reg)
{
FDCtrl *fdctrl = opaque;
uint32_t retval;
switch (reg) {
case FD_REG_SRA:
retval = fdctrl_read_statusA(fdctrl);
break;
case FD_REG_SRB:
retval = fdctrl_read_statusB(fdctrl);
break;
case FD_REG_DOR:
retval = fdctrl_read_dor(fdctrl);
break;
case FD_REG_TDR:
retval = fdctrl_read_tape(fdctrl);
break;
case FD_REG_MSR:
retval = fdctrl_read_main_status(fdctrl);
break;
case FD_REG_FIFO:
retval = fdctrl_read_data(fdctrl);
break;
case FD_REG_DIR:
retval = fdctrl_read_dir(fdctrl);
break;
default:
retval = (uint32_t)(-1);
break;
}
FLOPPY_DPRINTF("read reg%d: 0x%02x\n", reg & 7, retval);
return retval;
}
static void fdctrl_write (void *opaque, uint32_t reg, uint32_t value)
{
FDCtrl *fdctrl = opaque;
FLOPPY_DPRINTF("write reg%d: 0x%02x\n", reg & 7, value);
switch (reg) {
case FD_REG_DOR:
fdctrl_write_dor(fdctrl, value);
break;
case FD_REG_TDR:
fdctrl_write_tape(fdctrl, value);
break;
case FD_REG_DSR:
fdctrl_write_rate(fdctrl, value);
break;
case FD_REG_FIFO:
fdctrl_write_data(fdctrl, value);
break;
default:
break;
}
}
static uint32_t fdctrl_read_port (void *opaque, uint32_t reg)
{
return fdctrl_read(opaque, reg & 7);
}
static void fdctrl_write_port (void *opaque, uint32_t reg, uint32_t value)
{
fdctrl_write(opaque, reg & 7, value);
}
static uint32_t fdctrl_read_mem (void *opaque, target_phys_addr_t reg)
{
return fdctrl_read(opaque, (uint32_t)reg);
}
static void fdctrl_write_mem (void *opaque,
target_phys_addr_t reg, uint32_t value)
{
fdctrl_write(opaque, (uint32_t)reg, value);
}
static CPUReadMemoryFunc * const fdctrl_mem_read[3] = {
fdctrl_read_mem,
fdctrl_read_mem,
fdctrl_read_mem,
};
static CPUWriteMemoryFunc * const fdctrl_mem_write[3] = {
fdctrl_write_mem,
fdctrl_write_mem,
fdctrl_write_mem,
};
static CPUReadMemoryFunc * const fdctrl_mem_read_strict[3] = {
fdctrl_read_mem,
NULL,
NULL,
};
static CPUWriteMemoryFunc * const fdctrl_mem_write_strict[3] = {
fdctrl_write_mem,
NULL,
NULL,
};
static const VMStateDescription vmstate_fdrive = {
.name = "fdrive",
.version_id = 1,
.minimum_version_id = 1,
.minimum_version_id_old = 1,
.fields = (VMStateField []) {
VMSTATE_UINT8(head, FDrive),
VMSTATE_UINT8(track, FDrive),
VMSTATE_UINT8(sect, FDrive),
VMSTATE_END_OF_LIST()
}
};
static void fdc_pre_save(void *opaque)
{
FDCtrl *s = opaque;
s->dor_vmstate = s->dor | GET_CUR_DRV(s);
}
static int fdc_post_load(void *opaque, int version_id)
{
FDCtrl *s = opaque;
SET_CUR_DRV(s, s->dor_vmstate & FD_DOR_SELMASK);
s->dor = s->dor_vmstate & ~FD_DOR_SELMASK;
return 0;
}
static const VMStateDescription vmstate_fdc = {
.name = "fdc",
.version_id = 2,
.minimum_version_id = 2,
.minimum_version_id_old = 2,
.pre_save = fdc_pre_save,
.post_load = fdc_post_load,
.fields = (VMStateField []) {
/* Controller State */
VMSTATE_UINT8(sra, FDCtrl),
VMSTATE_UINT8(srb, FDCtrl),
VMSTATE_UINT8(dor_vmstate, FDCtrl),
VMSTATE_UINT8(tdr, FDCtrl),
VMSTATE_UINT8(dsr, FDCtrl),
VMSTATE_UINT8(msr, FDCtrl),
VMSTATE_UINT8(status0, FDCtrl),
VMSTATE_UINT8(status1, FDCtrl),
VMSTATE_UINT8(status2, FDCtrl),
/* Command FIFO */
VMSTATE_VARRAY_INT32(fifo, FDCtrl, fifo_size, 0, vmstate_info_uint8,
uint8_t),
VMSTATE_UINT32(data_pos, FDCtrl),
VMSTATE_UINT32(data_len, FDCtrl),
VMSTATE_UINT8(data_state, FDCtrl),
VMSTATE_UINT8(data_dir, FDCtrl),
VMSTATE_UINT8(eot, FDCtrl),
/* States kept only to be returned back */
VMSTATE_UINT8(timer0, FDCtrl),
VMSTATE_UINT8(timer1, FDCtrl),
VMSTATE_UINT8(precomp_trk, FDCtrl),
VMSTATE_UINT8(config, FDCtrl),
VMSTATE_UINT8(lock, FDCtrl),
VMSTATE_UINT8(pwrd, FDCtrl),
VMSTATE_UINT8_EQUAL(num_floppies, FDCtrl),
VMSTATE_STRUCT_ARRAY(drives, FDCtrl, MAX_FD, 1,
vmstate_fdrive, FDrive),
VMSTATE_END_OF_LIST()
}
};
static void fdctrl_external_reset_sysbus(DeviceState *d)
{
FDCtrlSysBus *sys = container_of(d, FDCtrlSysBus, busdev.qdev);
FDCtrl *s = &sys->state;
fdctrl_reset(s, 0);
}
static void fdctrl_external_reset_isa(DeviceState *d)
{
FDCtrlISABus *isa = container_of(d, FDCtrlISABus, busdev.qdev);
FDCtrl *s = &isa->state;
fdctrl_reset(s, 0);
}
static void fdctrl_handle_tc(void *opaque, int irq, int level)
{
//FDCtrl *s = opaque;
if (level) {
// XXX
FLOPPY_DPRINTF("TC pulsed\n");
}
}
/* XXX: may change if moved to bdrv */
int fdctrl_get_drive_type(FDCtrl *fdctrl, int drive_num)
{
return fdctrl->drives[drive_num].drive;
}
/* Change IRQ state */
static void fdctrl_reset_irq(FDCtrl *fdctrl)
{
if (!(fdctrl->sra & FD_SRA_INTPEND))
return;
FLOPPY_DPRINTF("Reset interrupt\n");
qemu_set_irq(fdctrl->irq, 0);
fdctrl->sra &= ~FD_SRA_INTPEND;
}
static void fdctrl_raise_irq(FDCtrl *fdctrl, uint8_t status0)
{
/* Sparc mutation */
if (fdctrl->sun4m && (fdctrl->msr & FD_MSR_CMDBUSY)) {
/* XXX: not sure */
fdctrl->msr &= ~FD_MSR_CMDBUSY;
fdctrl->msr |= FD_MSR_RQM | FD_MSR_DIO;
fdctrl->status0 = status0;
return;
}
if (!(fdctrl->sra & FD_SRA_INTPEND)) {
qemu_set_irq(fdctrl->irq, 1);
fdctrl->sra |= FD_SRA_INTPEND;
}
fdctrl->reset_sensei = 0;
fdctrl->status0 = status0;
FLOPPY_DPRINTF("Set interrupt status to 0x%02x\n", fdctrl->status0);
}
/* Reset controller */
static void fdctrl_reset(FDCtrl *fdctrl, int do_irq)
{
int i;
FLOPPY_DPRINTF("reset controller\n");
fdctrl_reset_irq(fdctrl);
/* Initialise controller */
fdctrl->sra = 0;
fdctrl->srb = 0xc0;
if (!fdctrl->drives[1].bs)
fdctrl->sra |= FD_SRA_nDRV2;
fdctrl->cur_drv = 0;
fdctrl->dor = FD_DOR_nRESET;
fdctrl->dor |= (fdctrl->dma_chann != -1) ? FD_DOR_DMAEN : 0;
fdctrl->msr = FD_MSR_RQM;
/* FIFO state */
fdctrl->data_pos = 0;
fdctrl->data_len = 0;
fdctrl->data_state = 0;
fdctrl->data_dir = FD_DIR_WRITE;
for (i = 0; i < MAX_FD; i++)
fd_recalibrate(&fdctrl->drives[i]);
fdctrl_reset_fifo(fdctrl);
if (do_irq) {
fdctrl_raise_irq(fdctrl, FD_SR0_RDYCHG);
fdctrl->reset_sensei = FD_RESET_SENSEI_COUNT;
}
}
static inline FDrive *drv0(FDCtrl *fdctrl)
{
return &fdctrl->drives[(fdctrl->tdr & FD_TDR_BOOTSEL) >> 2];
}
static inline FDrive *drv1(FDCtrl *fdctrl)
{
if ((fdctrl->tdr & FD_TDR_BOOTSEL) < (1 << 2))
return &fdctrl->drives[1];
else
return &fdctrl->drives[0];
}
#if MAX_FD == 4
static inline FDrive *drv2(FDCtrl *fdctrl)
{
if ((fdctrl->tdr & FD_TDR_BOOTSEL) < (2 << 2))
return &fdctrl->drives[2];
else
return &fdctrl->drives[1];
}
static inline FDrive *drv3(FDCtrl *fdctrl)
{
if ((fdctrl->tdr & FD_TDR_BOOTSEL) < (3 << 2))
return &fdctrl->drives[3];
else
return &fdctrl->drives[2];
}
#endif
static FDrive *get_cur_drv(FDCtrl *fdctrl)
{
switch (fdctrl->cur_drv) {
case 0: return drv0(fdctrl);
case 1: return drv1(fdctrl);
#if MAX_FD == 4
case 2: return drv2(fdctrl);
case 3: return drv3(fdctrl);
#endif
default: return NULL;
}
}
/* Status A register : 0x00 (read-only) */
static uint32_t fdctrl_read_statusA(FDCtrl *fdctrl)
{
uint32_t retval = fdctrl->sra;
FLOPPY_DPRINTF("status register A: 0x%02x\n", retval);
return retval;
}
/* Status B register : 0x01 (read-only) */
static uint32_t fdctrl_read_statusB(FDCtrl *fdctrl)
{
uint32_t retval = fdctrl->srb;
FLOPPY_DPRINTF("status register B: 0x%02x\n", retval);
return retval;
}
/* Digital output register : 0x02 */
static uint32_t fdctrl_read_dor(FDCtrl *fdctrl)
{
uint32_t retval = fdctrl->dor;
/* Selected drive */
retval |= fdctrl->cur_drv;
FLOPPY_DPRINTF("digital output register: 0x%02x\n", retval);
return retval;
}
static void fdctrl_write_dor(FDCtrl *fdctrl, uint32_t value)
{
FLOPPY_DPRINTF("digital output register set to 0x%02x\n", value);
/* Motors */
if (value & FD_DOR_MOTEN0)
fdctrl->srb |= FD_SRB_MTR0;
else
fdctrl->srb &= ~FD_SRB_MTR0;
if (value & FD_DOR_MOTEN1)
fdctrl->srb |= FD_SRB_MTR1;
else
fdctrl->srb &= ~FD_SRB_MTR1;
/* Drive */
if (value & 1)
fdctrl->srb |= FD_SRB_DR0;
else
fdctrl->srb &= ~FD_SRB_DR0;
/* Reset */
if (!(value & FD_DOR_nRESET)) {
if (fdctrl->dor & FD_DOR_nRESET) {
FLOPPY_DPRINTF("controller enter RESET state\n");
}
} else {
if (!(fdctrl->dor & FD_DOR_nRESET)) {
FLOPPY_DPRINTF("controller out of RESET state\n");
fdctrl_reset(fdctrl, 1);
fdctrl->dsr &= ~FD_DSR_PWRDOWN;
}
}
/* Selected drive */
fdctrl->cur_drv = value & FD_DOR_SELMASK;
fdctrl->dor = value;
}
/* Tape drive register : 0x03 */
static uint32_t fdctrl_read_tape(FDCtrl *fdctrl)
{
uint32_t retval = fdctrl->tdr;
FLOPPY_DPRINTF("tape drive register: 0x%02x\n", retval);
return retval;
}
static void fdctrl_write_tape(FDCtrl *fdctrl, uint32_t value)
{
/* Reset mode */
if (!(fdctrl->dor & FD_DOR_nRESET)) {
FLOPPY_DPRINTF("Floppy controller in RESET state !\n");
return;
}
FLOPPY_DPRINTF("tape drive register set to 0x%02x\n", value);
/* Disk boot selection indicator */
fdctrl->tdr = value & FD_TDR_BOOTSEL;
/* Tape indicators: never allow */
}
/* Main status register : 0x04 (read) */
static uint32_t fdctrl_read_main_status(FDCtrl *fdctrl)
{
uint32_t retval = fdctrl->msr;
fdctrl->dsr &= ~FD_DSR_PWRDOWN;
fdctrl->dor |= FD_DOR_nRESET;
/* Sparc mutation */
if (fdctrl->sun4m) {
retval |= FD_MSR_DIO;
fdctrl_reset_irq(fdctrl);
};
FLOPPY_DPRINTF("main status register: 0x%02x\n", retval);
return retval;
}
/* Data select rate register : 0x04 (write) */
static void fdctrl_write_rate(FDCtrl *fdctrl, uint32_t value)
{
/* Reset mode */
if (!(fdctrl->dor & FD_DOR_nRESET)) {
FLOPPY_DPRINTF("Floppy controller in RESET state !\n");
return;
}
FLOPPY_DPRINTF("select rate register set to 0x%02x\n", value);
/* Reset: autoclear */
if (value & FD_DSR_SWRESET) {
fdctrl->dor &= ~FD_DOR_nRESET;
fdctrl_reset(fdctrl, 1);
fdctrl->dor |= FD_DOR_nRESET;
}
if (value & FD_DSR_PWRDOWN) {
fdctrl_reset(fdctrl, 1);
}
fdctrl->dsr = value;
}
static int fdctrl_media_changed(FDrive *drv)
{
int ret;
if (!drv->bs)
return 0;
ret = bdrv_media_changed(drv->bs);
if (ret) {
fd_revalidate(drv);
}
return ret;
}
/* Digital input register : 0x07 (read-only) */
static uint32_t fdctrl_read_dir(FDCtrl *fdctrl)
{
uint32_t retval = 0;
if (fdctrl_media_changed(drv0(fdctrl))
|| fdctrl_media_changed(drv1(fdctrl))
#if MAX_FD == 4
|| fdctrl_media_changed(drv2(fdctrl))
|| fdctrl_media_changed(drv3(fdctrl))
#endif
)
retval |= FD_DIR_DSKCHG;
if (retval != 0) {
FLOPPY_DPRINTF("Floppy digital input register: 0x%02x\n", retval);