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[Qemu-devel] [ADD] Floppy disk controler emulation
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From: |
J. Mayer |
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Subject: |
[Qemu-devel] [ADD] Floppy disk controler emulation |
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Date: |
13 Nov 2003 20:06:30 +0100 |
Hello,
here's an emulation for Intel 82078 floopy disk controler. It seems to
have some bugs (make BSD kernel crash at probe time), but
allow Linux kernel boot from a floppy disk:
I saw Mandrake 9 booting, as well as OpenBSD 3.2, NetBSD 1.6 & BeOS 5.0.
QNX 6.2 loads but doesn't seem to start and RedHat Linux 9.0 makes qemu
crash (not related with fd emulation).
Please add this file:
fdc.c:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include "vl.h"
uint32_t __attribute((regparm(1))) __ldl_cmmu(unsigned long addr,
int is_user);
void __attribute((regparm(2))) __stl_cmmu(unsigned long addr, uint32_t
v,
int is_user);
uint8_t __attribute((regparm(1))) __ldb_cmmu(unsigned long addr,
int is_user);
void __attribute((regparm(2))) __stb_cmmu(unsigned long addr, uint8_t v,
int is_user);
/********************************************************/
/* debug Floppy devices */
//#define DEBUG_FLOPPY
/* 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, /* */
} 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 */
uint32_t abs_last_sect; /* Size of the disk image */
uint8_t ro; /* Is read-only */
} fdrive_t;
/* Not a lot of things to do to init a drive... */
static void fd_init (fdrive_t *drv)
{
drv->bs = NULL;
drv->drive = FDRIVE_DISK_288;
drv->perpendicular = 0;
}
/* Returns current position, in sectors, for given drive */
static int fd_sector (fdrive_t *drv)
{
return (((drv->track * 2) + drv->head) * drv->last_sect) + drv->sect
- 1;
}
static int fd_seek (fdrive_t *drv, uint8_t head, uint8_t track, uint8_t
sect)
{
uint32_t sector;
sector = (((track * 2) + head) * drv->last_sect) + sect - 1;
if (sector > drv->abs_last_sect) {
printf("FDC error: sector: %d max sect: %d\n",
sector, drv->abs_last_sect);
return -1;
}
drv->head = head;
drv->track = track;
drv->sect = sect;
return 0;
}
/* Set drive back to track 0 */
static void fd_recalibrate (fdrive_t *drv)
{
#ifdef DEBUG_FLOPPY
printf("%s\n", __func__);
#endif
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;
if (drv->bs != NULL) {
bdrv_get_geometry(drv->bs, &nb_sectors);
if (nb_sectors > 2880) {
/* Pretend we have a 2.88 MB disk */
drv->disk = FDRIVE_DISK_288;
drv->last_sect = 36;
#if 0
} 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;
}
#else
} else {
/* Pretend we have a 1.44 MB disk */
drv->disk = FDRIVE_DISK_144;
drv->last_sect = 18;
drv->max_track = 80;
}
#endif
drv->abs_last_sect = nb_sectors;
} else {
drv->disk = FDRIVE_DISK_NONE;
drv->last_sect = 1; /* Avoid eventual divide by 0 bugs */
drv->abs_last_sect = 0;
}
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_revalidate(drv, 1);
fd_recalibrate(drv);
}
/********************************************************/
/* Intel 82078 floppy disk controler emulation */
enum {
FD_CTRL_ACTIVE = 0x01,
FD_CTRL_RESET = 0x02,
FD_CTRL_SLEEP = 0x04,
FD_CTRL_BUSY = 0x08,
};
enum {
FD_DIR_WRITE = 0,
FD_DIR_READ = 1,
FD_DIR_VERIFY = 2,
};
enum {
FD_STATE_CMD = 0,
FD_STATE_STATUS = 1,
FD_STATE_DATA = 2,
};
#define FD_FIFO_LEN FD_SECTOR_LEN
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_FIFO_LEN];
uint32_t data_pos;
uint32_t data_len;
uint8_t data_state;
uint8_t data_dir;
/* 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;
static void fdctrl_reset (void);
static int fdctrl_transfer_handler (uint32_t addr, int size, int *irq);
static int fdctrl_misc_handler (int duknwo);
static void fdctrl_stop_transfer (uint8_t status0, uint8_t status1);
void fdctrl_init (int irq_lvl, int dma_chann)
{
int i;
#ifdef DEBUG_FLOPPY
printf("%s\n", __func__);
#endif
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();
fdctrl.state = FD_CTRL_ACTIVE;
}
static void fdctrl_reset (void)
{
int i;
#ifdef DEBUG_FLOPPY
printf("%s\n", __func__);
#endif
/* Initialise controler */
fdctrl.cur_drv = 0;
fdctrl.bootsel = 0; /* FDA & FDB aren't interverted by default */
/* 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]);
}
/* floppy controler helpers */
/* Reset FIFO state so the host can send commands */
static void fdctrl_reset_state (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_state (int fifo_len)
{
fdctrl.data_dir = FD_DIR_READ;
fdctrl.data_len = fifo_len;
fdctrl.data_pos = 0;
fdctrl.data_state = FD_STATE_STATUS;
}
/* Set an error: unimplemented/unknown command */
static void fdctrl_unimplemented (void)
{
fdrive_t *cur_drv, *drv0, *drv1;
drv0 = &fdctrl.drives[0];
drv1 = &fdctrl.drives[1];
cur_drv = fdctrl.cur_drv == 0 ? drv0 : drv1;
fdctrl.fifo[0] = 0x80 | (cur_drv->head << 2) | fdctrl.cur_drv;
fdctrl_set_state(1);
}
int fdctrl_transfer_handler (uint32_t addr, int size, int *irq)
{
fdrive_t *cur_drv, *drv0, *drv1;
int len, tmp;
if (!(fdctrl.state & FD_CTRL_BUSY)) {
#ifdef DEBUG_FLOPPY
printf("Not in DMA transfer mode !\n");
#endif
return 0;
}
drv0 = &fdctrl.drives[0];
drv1 = &fdctrl.drives[1];
cur_drv = fdctrl.cur_drv == 0 ? drv0 : drv1;
*irq = fdctrl.irq_lvl;
*irq = -1;
for (fdctrl.data_len = size; fdctrl.data_pos < fdctrl.data_len;
fdctrl.data_pos += len) {
len = size - fdctrl.data_pos;
if (len > FD_FIFO_LEN)
len = FD_FIFO_LEN;
#ifdef DEBUG_FLOPPY
printf("Read %d bytes (%d %d %d) from sect %d (0x%08x)\n", len,
size, fdctrl.data_pos, fdctrl.data_len,
fd_sector(cur_drv), fd_sector(cur_drv) * 512);
#endif
if (len < FD_FIFO_LEN)
memset(&fdctrl.fifo[FD_FIFO_LEN - len], 0, FD_FIFO_LEN - len
- 1);
if (fdctrl.data_dir != FD_DIR_WRITE) {
/* READ & VERIFY commands */
if (bdrv_read(cur_drv->bs, fd_sector(cur_drv),
fdctrl.fifo, 1) < 0) {
#ifdef DEBUG_FLOPPY
printf("Floppy: error getting sector %d\n",
fd_sector(cur_drv));
#endif
/* Sure, image size is too small... */
memset(fdctrl.fifo, 0, FD_FIFO_LEN);
}
if (fdctrl.data_dir == FD_DIR_READ) {
memcpy((void *)(addr + fdctrl.data_pos),
fdctrl.fifo, FD_FIFO_LEN);
} else {
if (memcmp((void *)(addr + fdctrl.data_pos),
fdctrl.fifo, FD_FIFO_LEN) != 0) {
/* TODO: set status */
}
}
} else {
/* WRITE commands */
memcpy(fdctrl.fifo, (void *)(addr + fdctrl.data_pos),
FD_FIFO_LEN);
if (bdrv_write(cur_drv->bs, fd_sector(cur_drv),
fdctrl.fifo, 1) < 0) {
printf("Floppy: error writting sector %d\n",
fd_sector(cur_drv));
fdctrl_stop_transfer(0x60, 0x00);
goto transfer_error;
}
}
for (tmp = len; tmp >= FD_SECTOR_LEN; tmp -= FD_SECTOR_LEN) {
/* Seek to next sector */
if (cur_drv->sect == cur_drv->last_sect) {
if (!(fdctrl.fifo[0] & 0x80)) {
/* Single track read */
#ifdef DEBUG_FLOPPY
printf("single track read: end transfer\n");
#endif
goto end_transfer;
}
if (cur_drv->head == 0) {
cur_drv->head = 1;
} else {
cur_drv->track++;
cur_drv->head = 0;
}
cur_drv->sect = 0;
} else {
cur_drv->sect++;
}
}
}
end_transfer:
fdctrl_stop_transfer(0x20, 0x00);
transfer_error:
return fdctrl.data_pos;
}
/* Unused... */
static int fdctrl_misc_handler (int duknwo)
{
return -1;
}
static void fdctrl_stop_transfer (uint8_t status0, uint8_t status1)
{
fdrive_t *cur_drv, *drv0, *drv1;
#ifdef DEBUG_FLOPPY
printf("%s\n", __func__);
#endif
drv0 = &fdctrl.drives[0];
drv1 = &fdctrl.drives[1];
cur_drv = fdctrl.cur_drv == 0 ? drv0 : drv1;
fdctrl.fifo[0] = status0 | (cur_drv->head << 1) | fdctrl.cur_drv;
fdctrl.fifo[1] = status1;
/* Status indicates hw error that won't occur here */
fdctrl.fifo[2] = 0x00;
fdctrl.fifo[3] = cur_drv->track;
fdctrl.fifo[4] = cur_drv->head;
fdctrl.fifo[5] = cur_drv->sect;
fdctrl.fifo[6] = FD_SECTOR_SC;
fdctrl_set_state(7);
if (fdctrl.state & FD_CTRL_BUSY) {
DMA_release_DREQ(fdctrl.dma_chann);
fdctrl.state &= ~FD_CTRL_BUSY;
}
#if 1
/* WARNING:
* Should be done by the interrupt handler.
* have to check what's going wrong...
*/
__stb_cmmu(0x043E, __ldb_cmmu(0x043E, 0) | 0x80, 0);
#endif
}
static void fdctrl_start_transfer (int direction)
{
fdrive_t *cur_drv, *drv0, *drv1;
uint8_t kh, kt, ks;
#ifdef DEBUG_FLOPPY
// printf("%s\n", __func__);
#endif
drv0 = &fdctrl.drives[0];
drv1 = &fdctrl.drives[1];
fdctrl.cur_drv = fdctrl.fifo[1] & 1;
cur_drv = fdctrl.cur_drv == 0 ? drv0 : drv1;
kt = fdctrl.fifo[2];
kh = fdctrl.fifo[3];
ks = fdctrl.fifo[4];
#if 1
if (fdctrl.fifo[4] > cur_drv->last_sect ||
/* ((fdctrl.config & 0x40) == 0 && cur_drv->track !=
fdctrl.fifo[2]) || */
fd_seek(cur_drv, kh, kt, ks) < 0) {
/* No implicit seek enabled => ERROR */
#ifdef DEBUG_FLOPPY
printf("%s: no implicit SEEK enabled...\n", __func__);
printf("asked: %d last_sect=%d\n", fdctrl.fifo[4],
cur_drv->last_sect);
#endif
fdctrl_stop_transfer(0x60, 0x00);
fdctrl.fifo[3] = kt;
fdctrl.fifo[4] = kh;
fdctrl.fifo[5] = ks;
}
#endif
/* Set the FIFO state */
fdctrl.data_dir = direction;
fdctrl.data_pos = 0;
fdctrl.data_state = FD_STATE_DATA; /* FIFO ready for data */
if (fdctrl.dma_en) {
int dma_mode;
/* DMA transfer are enabled. Check if DMA channel is well
programmed */
dma_mode = DMA_get_channel_mode(fdctrl.dma_chann);
dma_mode = (dma_mode >> 2) & 3;
#ifdef DEBUG_FLOPPY
printf("dma_mode=%d direction=%d\n", dma_mode, direction);
#endif
if ((direction == FD_DIR_VERIFY && dma_mode == 0) ||
(direction == FD_DIR_WRITE && dma_mode == 2) ||
(direction == FD_DIR_READ && dma_mode == 1)) {
/* No access is allowed until DMA transfer has completed */
fdctrl.state |= FD_CTRL_BUSY;
/* Now, we just have to wait for the DMA controler to
* recall us...
*/
DMA_hold_DREQ(fdctrl.dma_chann);
return;
}
}
#ifdef DEBUG_FLOPPY
printf("%s: non-DMA transfer\n", __func__);
#endif
/* IO based transfer: calculate len */
if (fdctrl.fifo[5] == 00) {
fdctrl.data_len = fdctrl.fifo[8];
} else {
fdctrl.data_len = 128 << fdctrl.fifo[5];
}
fdctrl.data_len *= cur_drv->last_sect;
if (fdctrl.fifo[0] & 0x80)
fdctrl.data_len *= 2;
return;
}
static void fdctrl_start_transfer_del (int direction)
{
/* We don't handle deleted data,
* so we don't return *ANYTHING*
*/
fdctrl_stop_transfer(0x60, 0x00);
}
int fdctrl_disk_change (int idx, const unsigned char *filename, int ro)
{
fdrive_t *drv;
if (idx < 0 || idx > 1)
return -1;
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);
fd_recalibrate(drv);
return 0;
}
void fdctrl_write_register (uint32_t reg, uint32_t value)
{
fdrive_t *cur_drv, *drv0, *drv1;
drv0 = &fdctrl.drives[0];
drv1 = &fdctrl.drives[1];
cur_drv = fdctrl.cur_drv == 0 ? drv0 : drv1;
#ifdef DEBUG_FLOPPY
// printf("%s\n", __func__);
#endif
/* Reset mode */
if (fdctrl.state & FD_CTRL_RESET) {
if (reg != 0x2 || !(value & 0x04))
return;
#ifdef DEBUG_FLOPPY
printf("Floppy controler out of RESET state\n");
#endif
fdctrl.state &= ~FD_CTRL_RESET;
}
switch (reg) {
case 0x2:
/* Digital output register */
#ifdef DEBUG_FLOPPY
printf("Floppy digital output register set to 0x%02x\n", value);
#endif
/* 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 (fdctrl.dma_chann != -1)
fdctrl.dma_en = (value >> 3) & 1;
/* Reset */
if (value & 0x04) {
fdctrl.state |= FD_CTRL_RESET;
fdctrl_reset();
fdctrl.state &= ~FD_CTRL_RESET;
}
/* Selected drive */
fdctrl.cur_drv = value & 1;
break;
case 0x3:
/* Tape drive register */
#ifdef DEBUG_FLOPPY
printf("Floppy tape drive register set to 0x%02x\n", value);
#endif
/* Disk boot selection indicator */
fdctrl.bootsel = (value >> 2) & 1;
/* Tape indicators: never allow */
break;
case 0x4:
/* Data select rate register */
#ifdef DEBUG_FLOPPY
printf("Floppy select rate register set to 0x%02x\n", value);
#endif
/* Reset */
if (value & 0x80) {
fdctrl.state |= FD_CTRL_RESET;
fdctrl_reset();
}
if (value & 0x40) {
fdctrl.state |= FD_CTRL_SLEEP;
fdctrl_reset();
}
// fdctrl.precomp = (value >> 2) & 0x07;
break;
case 0x5:
/* Data register */
fdctrl.state &= ~FD_CTRL_SLEEP;
/* Is it write command time ? */
if (fdctrl.data_state == FD_STATE_DATA) {
/* FIFO data write */
fdctrl.fifo[fdctrl.data_pos++] = value;
if (fdctrl.data_pos % FD_FIFO_LEN == (FD_FIFO_LEN - 1) ||
fdctrl.data_pos == fdctrl.data_len) {
bdrv_write(cur_drv->bs, fd_sector(cur_drv),
fdctrl.fifo, FD_FIFO_LEN);
}
/* Switch from transfert mode to status mode
* then from status mode to command mode
*/
if (--fdctrl.data_state == 0x3) {
fdctrl_stop_transfer(0x20, 0x00);
fdctrl.data_dir = FD_DIR_READ;
}
return;
}
if (fdctrl.data_state != FD_STATE_CMD)
break;
if (fdctrl.data_pos == 0) {
/* Command */
switch (value & 0x1F) {
case 0x06:
/* READ variants */
#ifdef DEBUG_FLOPPY
printf("Floppy: READ command\n");
#endif
/* 8 parameters cmd */
fdctrl.data_len = 9;
goto enqueue;
case 0x0C:
/* READ_DELETED variants */
#ifdef DEBUG_FLOPPY
printf("Floppy: READ_DELETED command\n");
#endif
/* 8 parameters cmd */
fdctrl.data_len = 9;
goto enqueue;
case 0x10:
/* SCAN_EQUAL variants */
#ifdef DEBUG_FLOPPY
printf("Floppy: SCAN_EQUAL command\n");
#endif
/* 8 parameters cmd */
fdctrl.data_len = 9;
goto enqueue;
case 0x16:
/* VERIFY variants */
#ifdef DEBUG_FLOPPY
printf("Floppy: VERIFY command\n");
#endif
/* 8 parameters cmd */
fdctrl.data_len = 9;
goto enqueue;
case 0x19:
/* SCAN_LOW_OR_EQUAL variants */
#ifdef DEBUG_FLOPPY
printf("Floppy: SCAN_LOW_OR_EQUAL command\n");
#endif
/* 8 parameters cmd */
fdctrl.data_len = 9;
goto enqueue;
case 0x1D:
/* SCAN_HIGH_OR_EQUAL variants */
#ifdef DEBUG_FLOPPY
printf("Floppy: SCAN_HIGH_OR_EQUAL command\n");
#endif
/* 8 parameters cmd */
fdctrl.data_len = 9;
goto enqueue;
default:
break;
}
switch (value & 0x3F) {
case 0x05:
/* WRITE variants */
#ifdef DEBUG_FLOPPY
printf("Floppy: WRITE command\n");
#endif
/* 8 parameters cmd */
fdctrl.data_len = 9;
goto enqueue;
case 0x09:
/* WRITE_DELETED variants */
#ifdef DEBUG_FLOPPY
printf("Floppy: WRITE_DELETED command\n");
#endif
/* 8 parameters cmd */
fdctrl.data_len = 9;
goto enqueue;
default:
break;
}
switch (value) {
case 0x03:
/* SPECIFY */
#ifdef DEBUG_FLOPPY
printf("Floppy: SPECIFY command\n");
#endif
/* 1 parameter cmd */
fdctrl.data_len = 2;
goto enqueue;
case 0x04:
/* SENSE_DRIVE_STATUS */
#ifdef DEBUG_FLOPPY
printf("Floppy: SENSE_DRIVE_STATUS command\n");
#endif
/* 1 parameter cmd */
fdctrl.data_len = 2;
goto enqueue;
case 0x07:
/* RECALIBRATE */
#ifdef DEBUG_FLOPPY
printf("Floppy: RECALIBRATE command\n");
#endif
/* 1 parameter cmd */
fdctrl.data_len = 2;
goto enqueue;
case 0x08:
/* SENSE_INTERRUPT_STATUS */
#ifdef DEBUG_FLOPPY
printf("Floppy: SENSE_INTERRUPT_STATUS command\n");
#endif
/* No parameters cmd: returns status if no interrupt */
fdctrl.fifo[0] = (cur_drv->head << 2) | fdctrl.cur_drv;
fdctrl.fifo[1] = cur_drv->track;
fdctrl_set_state(2);
return;
case 0x0E:
/* DATA_BUS */
#ifdef DEBUG_FLOPPY
printf("Floppy: DATA_BUS command\n");
#endif
/* Drives position */
fdctrl.fifo[0] = drv0->track;
fdctrl.fifo[1] = drv1->track;
fdctrl.fifo[2] = 0;
fdctrl.fifo[3] = 0;
/* timers */
fdctrl.fifo[4] = fdctrl.timer0;
fdctrl.fifo[5] = (fdctrl.timer1 << 1) | fdctrl.dma_en;
fdctrl.fifo[6] = cur_drv->last_sect;
fdctrl.fifo[7] = (fdctrl.lock << 7) |
(cur_drv->perpendicular << 2);
fdctrl.fifo[8] = fdctrl.config;
fdctrl.fifo[9] = fdctrl.precomp_trk;
fdctrl_set_state(10);
return;
case 0x0F:
/* SEEK */
#ifdef DEBUG_FLOPPY
printf("Floppy: SEEK command\n");
#endif
/* 2 parameters cmd */
fdctrl.data_len = 3;
goto enqueue;
case 0x10:
/* VERSION */
#ifdef DEBUG_FLOPPY
printf("Floppy: VERSION command\n");
#endif
/* No parameters cmd */
/* Controler's version */
fdctrl.fifo[0] = fdctrl.version;
fdctrl_set_state(1);
return;
case 12:
/* PERPENDICULAR_MODE */
#ifdef DEBUG_FLOPPY
printf("Floppy: PERPENDICULAR_MODE command\n");
#endif
/* 1 parameter cmd */
fdctrl.data_len = 2;
goto enqueue;
case 0x13:
/* CONFIGURE */
#ifdef DEBUG_FLOPPY
printf("Floppy: CONFIGURE command\n");
#endif
/* 3 parameters cmd */
fdctrl.data_len = 4;
goto enqueue;
case 0x14:
/* UNLOCK */
#ifdef DEBUG_FLOPPY
printf("Floppy: UNLOCK command\n");
#endif
/* No parameters cmd */
fdctrl.lock = 0;
fdctrl.fifo[0] = 0;
fdctrl_set_state(1);
return;
case 0x17:
/* POWERDOWN_MODE */
#ifdef DEBUG_FLOPPY
printf("Floppy: POWERDOWN_MODE command\n");
#endif
/* 2 parameters cmd */
fdctrl.data_len = 3;
goto enqueue;
case 0x18:
/* PART_ID */
#ifdef DEBUG_FLOPPY
printf("Floppy: PART_ID command\n");
#endif
/* No parameters cmd */
fdctrl.fifo[0] = 0x43; /* Stepping 1 */
fdctrl_set_state(1);
return;
case 0x2C:
/* SAVE */
#ifdef DEBUG_FLOPPY
printf("Floppy: SAVE command\n");
#endif
/* No parameters cmd */
fdctrl.fifo[0] = 0;
fdctrl.fifo[1] = 0;
/* Drives position */
fdctrl.fifo[2] = drv0->track;
fdctrl.fifo[3] = drv1->track;
fdctrl.fifo[4] = 0;
fdctrl.fifo[5] = 0;
/* timers */
fdctrl.fifo[6] = fdctrl.timer0;
fdctrl.fifo[7] = fdctrl.timer1;
fdctrl.fifo[8] = cur_drv->last_sect;
fdctrl.fifo[9] = (fdctrl.lock << 7) |
(cur_drv->perpendicular << 2);
fdctrl.fifo[10] = fdctrl.config;
fdctrl.fifo[11] = fdctrl.precomp_trk;
fdctrl.fifo[12] = fdctrl.pwrd;
fdctrl.fifo[13] = 0;
fdctrl.fifo[14] = 0;
fdctrl_set_state(15);
return;
case 0x33:
/* OPTION */
#ifdef DEBUG_FLOPPY
printf("Floppy: OPTION command\n");
#endif
/* 1 parameter cmd */
fdctrl.data_len = 2;
goto enqueue;
case 0x42:
/* READ_TRACK */
#ifdef DEBUG_FLOPPY
printf("Floppy: READ_TRACK command\n");
#endif
/* 8 parameters cmd */
fdctrl.data_len = 9;
goto enqueue;
case 0x4A:
/* READ_ID */
#ifdef DEBUG_FLOPPY
printf("Floppy: READ_ID command\n");
#endif
/* 1 parameter cmd */
fdctrl.data_len = 2;
goto enqueue;
case 0x4C:
/* RESTORE */
#ifdef DEBUG_FLOPPY
printf("Floppy: RESTORE command\n");
#endif
/* 17 parameters cmd */
fdctrl.data_len = 18;
goto enqueue;
case 0x4D:
/* FORMAT_TRACK */
#ifdef DEBUG_FLOPPY
printf("Floppy: FORMAT_TRACK command\n");
#endif
/* 5 parameters cmd */
fdctrl.data_len = 6;
goto enqueue;
case 0x8E:
/* DRIVE_SPECIFICATION_COMMAND */
#ifdef DEBUG_FLOPPY
printf("Floppy: DRIVE_SPECIFICATION_COMMAND command\n");
#endif
/* 5 parameters cmd */
fdctrl.data_len = 6;
goto enqueue;
case 0x8F:
/* RELATIVE_SEEK_OUT */
#ifdef DEBUG_FLOPPY
printf("Floppy: RELATIVE_SEEK_OUT command\n");
#endif
/* 2 parameters cmd */
fdctrl.data_len = 3;
goto enqueue;
case 0x94:
/* LOCK */
#ifdef DEBUG_FLOPPY
printf("Floppy: LOCK command\n");
#endif
/* No parameters cmd */
fdctrl.lock = 1;
fdctrl.fifo[0] = 0x10;
fdctrl_set_state(1);
return;
case 0xCD:
/* FORMAT_AND_WRITE */
#ifdef DEBUG_FLOPPY
printf("Floppy: FORMAT_AND_WRITE command\n");
#endif
/* 10 parameters cmd */
fdctrl.data_len = 11;
goto enqueue;
case 0xCF:
/* RELATIVE_SEEK_IN */
#ifdef DEBUG_FLOPPY
printf("Floppy: RELATIVE_SEEK_IN command\n");
#endif
/* 2 parameters cmd */
fdctrl.data_len = 3;
goto enqueue;
default:
/* Unknown command */
#ifdef DEBUG_FLOPPY
printf("Floppy: ERROR: unknown command: %d\n", value);
#endif
fdctrl_unimplemented();
return;
}
}
enqueue:
fdctrl.fifo[fdctrl.data_pos] = value;
if (++fdctrl.data_pos == fdctrl.data_len) {
/* We now have all parameters
* and will be able to treat the command
*/
switch (fdctrl.fifo[0] & 0x1F) {
case 0x06:
{
/* READ variants */
#ifdef DEBUG_FLOPPY
printf("Floppy: treat READ command\n");
#endif
fdctrl_start_transfer(1);
return;
}
case 0x0C:
/* READ_DELETED variants */
#ifdef DEBUG_FLOPPY
printf("Floppy: treat READ_DELETED command\n");
#endif
fdctrl_start_transfer_del(1);
return;
case 0x16:
/* VERIFY variants */
#ifdef DEBUG_FLOPPY
printf("Floppy: treat VERIFY command\n");
#endif
fdctrl_start_transfer(2);
return;
case 0x10:
/* SCAN_EQUAL variants */
#ifdef DEBUG_FLOPPY
printf("Floppy: treat SCAN_EQUAL command\n");
#endif
fdctrl_unimplemented();
return;
case 0x19:
/* SCAN_LOW_OR_EQUAL variants */
#ifdef DEBUG_FLOPPY
printf("Floppy: treat SCAN_LOW_OR_EQUAL command\n");
#endif
fdctrl_unimplemented();
return;
case 0x1D:
/* SCAN_HIGH_OR_EQUAL variants */
#ifdef DEBUG_FLOPPY
printf("Floppy: treat SCAN_HIGH_OR_EQUAL command\n");
#endif
fdctrl_unimplemented();
return;
default:
break;
}
switch (fdctrl.fifo[0] & 0x3F) {
case 0x05:
/* WRITE variants */
#ifdef DEBUG_FLOPPY
printf("Floppy: treat WRITE command\n");
#endif
fdctrl_start_transfer(0);
return;
case 0x09:
/* WRITE_DELETED variants */
#ifdef DEBUG_FLOPPY
printf("Floppy: treat WRITE_DELETED command\n");
#endif
fdctrl_start_transfer_del(0);
return;
default:
break;
}
switch (fdctrl.fifo[0]) {
case 0x03:
/* SPECIFY */
#ifdef DEBUG_FLOPPY
printf("Floppy: treat SPECIFY command\n");
#endif
fdctrl.timer0 = (fdctrl.fifo[1] >> 4) & 0xF;
fdctrl.timer1 = fdctrl.fifo[1] >> 1;
/* No result back */
fdctrl_reset_state();
return;
case 0x04:
/* SENSE_DRIVE_STATUS */
#ifdef DEBUG_FLOPPY
printf("Floppy: treat SENSE_DRIVE_STATUS command\n");
#endif
fdctrl.cur_drv = fdctrl.fifo[1] & 1;
cur_drv = fdctrl.cur_drv == 0 ? drv0 : drv1;
cur_drv->head = (fdctrl.fifo[1] >> 2) & 1;
/* 1 Byte status back */
fdctrl.fifo[0] = 0x00;
fdctrl_set_state(1);
return;
case 0x07:
/* RECALIBRATE */
#ifdef DEBUG_FLOPPY
printf("Floppy: treat RECALIBRATE command\n");
#endif
fdctrl.cur_drv = fdctrl.fifo[1] & 1;
cur_drv = fdctrl.cur_drv == 0 ? drv0 : drv1;
cur_drv->track = 0;
fdctrl_reset_state();
/* Raise Interrupt */
pic_set_irq(fdctrl.irq_lvl, 1);
#if 1
__stb_cmmu(0x043E, __ldb_cmmu(0x043E, 0) | 0x80, 0);
#endif
return;
case 0x0F:
/* SEEK */
#ifdef DEBUG_FLOPPY
printf("Floppy: treat SEEK command\n");
#endif
fdctrl.cur_drv = fdctrl.fifo[1] & 1;
cur_drv = fdctrl.cur_drv == 0 ? drv0 : drv1;
if (fdctrl.fifo[2] <= cur_drv->track)
cur_drv->dir = 1;
else
cur_drv->dir = 0;
cur_drv->head = (fdctrl.fifo[1] >> 2) & 1;
cur_drv->track = fdctrl.fifo[2];
fdctrl_reset_state();
/* Raise Interrupt */
pic_set_irq(fdctrl.irq_lvl, 1);
#if 1
__stb_cmmu(0x043E, __ldb_cmmu(0x043E, 0) | 0x80, 0);
#endif
return;
case 12:
/* PERPENDICULAR_MODE */
#ifdef DEBUG_FLOPPY
printf("Floppy: treat PERPENDICULAR_MODE command\n");
#endif
if (fdctrl.fifo[1] & 0x80)
cur_drv->perpendicular = fdctrl.fifo[1] & 0x7;
/* No result back */
fdctrl_reset_state();
return;
case 0x13:
/* CONFIGURE */
#ifdef DEBUG_FLOPPY
printf("Floppy: treat CONFIGURE command\n");
#endif
fdctrl.config = fdctrl.fifo[2];
fdctrl.precomp_trk = fdctrl.fifo[3];
/* No result back */
fdctrl_reset_state();
return;
case 0x17:
/* POWERDOWN_MODE */
#ifdef DEBUG_FLOPPY
printf("Floppy: treat POWERDOWN_MODE command\n");
#endif
fdctrl.pwrd = fdctrl.fifo[1];
fdctrl.fifo[0] = fdctrl.fifo[1];
fdctrl_set_state(1);
return;
case 0x33:
/* OPTION */
#ifdef DEBUG_FLOPPY
printf("Floppy: treat OPTION command\n");
#endif
/* No result back */
fdctrl_reset_state();
return;
case 0x42:
/* READ_TRACK */
#ifdef DEBUG_FLOPPY
printf("Floppy: treat READ_TRACK command\n");
#endif
fdctrl_unimplemented();
return;
case 0x4A:
/* READ_ID */
#ifdef DEBUG_FLOPPY
printf("Floppy: treat READ_ID command\n");
#endif
fdctrl_unimplemented();
return;
case 0x4C:
/* RESTORE */
#ifdef DEBUG_FLOPPY
printf("Floppy: treat RESTORE command\n");
#endif
/* Drives position */
drv0->track = fdctrl.fifo[3];
drv1->track = fdctrl.fifo[4];
/* timers */
fdctrl.timer0 = fdctrl.fifo[7];
fdctrl.timer1 = fdctrl.fifo[8];
cur_drv->last_sect = fdctrl.fifo[9];
fdctrl.lock = fdctrl.fifo[10] >> 7;
cur_drv->perpendicular = (fdctrl.fifo[10] >> 2) & 0xF;
fdctrl.config = fdctrl.fifo[11];
fdctrl.precomp_trk = fdctrl.fifo[12];
fdctrl.pwrd = fdctrl.fifo[13];
fdctrl_reset_state();
return;
case 0x4D:
/* FORMAT_TRACK */
#ifdef DEBUG_FLOPPY
printf("Floppy: treat FORMAT_TRACK command\n");
#endif
fdctrl_unimplemented();
return;
case 0x8E:
/* DRIVE_SPECIFICATION_COMMAND */
#ifdef DEBUG_FLOPPY
printf("Floppy: treat DRIVE_SPECIFICATION_COMMAND
command\n");
#endif
if (fdctrl.fifo[fdctrl.data_pos - 1] & 0x80) {
/* Command parameters done */
if (fdctrl.fifo[fdctrl.data_pos - 1] & 0x40) {
fdctrl.fifo[0] = fdctrl.fifo[1];
fdctrl.fifo[2] = 0;
fdctrl.fifo[3] = 0;
fdctrl_set_state(4);
} else {
fdctrl_reset_state();
}
} else if (fdctrl.data_len > 7) {
/* ERROR */
fdctrl.fifo[0] = 0x80 |
(cur_drv->head << 2) | fdctrl.cur_drv;
fdctrl_set_state(1);
}
return;
case 0x8F:
/* RELATIVE_SEEK_OUT */
#ifdef DEBUG_FLOPPY
printf("Floppy: treat RELATIVE_SEEK_OUT command\n");
#endif
fdctrl.cur_drv = fdctrl.fifo[1] & 1;
cur_drv = fdctrl.cur_drv == 0 ? drv0 : drv1;
cur_drv->head = (fdctrl.fifo[1] >> 2) & 1;
if (fdctrl.fifo[2] + cur_drv->track >
cur_drv->max_track) {
/* ERROR */
fdctrl.fifo[0] = 0x50 |
(cur_drv->head << 2) | fdctrl.cur_drv;
fdctrl_set_state(1);
} else {
cur_drv->track += fdctrl.fifo[2];
cur_drv->dir = 0;
fdctrl_reset_state();
pic_set_irq(fdctrl.irq_lvl, 1);
#if 1
__stb_cmmu(0x043E, __ldb_cmmu(0x043E, 0) | 0x80, 0);
#endif
}
return;
case 0xCD:
/* FORMAT_AND_WRITE */
#ifdef DEBUG_FLOPPY
printf("Floppy: treat FORMAT_AND_WRITE command\n");
#endif
fdctrl_unimplemented();
return;
case 0xCF:
/* RELATIVE_SEEK_IN */
#ifdef DEBUG_FLOPPY
printf("Floppy: treat RELATIVE_SEEK_IN command\n");
#endif
fdctrl.cur_drv = fdctrl.fifo[1] & 1;
cur_drv = fdctrl.cur_drv == 0 ? drv0 : drv1;
cur_drv->head = (fdctrl.fifo[1] >> 2) & 1;
if (fdctrl.fifo[2] > cur_drv->track) {
/* ERROR */
fdctrl.fifo[0] = 0x50 |
(cur_drv->head << 2) | fdctrl.cur_drv;
fdctrl_set_state(1);
} else {
fdctrl_reset_state();
cur_drv->track -= fdctrl.fifo[2];
cur_drv->dir = 1;
/* Raise Interrupt */
pic_set_irq(fdctrl.irq_lvl, 1);
#if 1
__stb_cmmu(0x043E, __ldb_cmmu(0x043E, 0) | 0x80, 0);
#endif
}
return;
}
}
break;
case 0x7:
#ifdef DEBUG_FLOPPY
printf("Floppy digital input register id read-only\n");
#endif
break;
case 0x1:
/* Status register B */
#ifdef DEBUG_FLOPPY
printf("Floppy state B register is read-only\n");
#endif
break;
default:
printf("ERROR: attempt to write to an unknown floppy port:
%x\n",
reg);
break;
}
}
uint32_t fdctrl_read_register (uint32_t reg)
{
fdrive_t *cur_drv, *drv0, *drv1;
uint32_t retval = 0;
int pos, len;
drv0 = &fdctrl.drives[0];
drv1 = &fdctrl.drives[1];
cur_drv = fdctrl.cur_drv == 0 ? drv0 : drv1;
switch (reg) {
case 0x1:
#ifdef DEBUG_FLOPPY
printf("Floppy status register: 0x%02x\n", retval);
#endif
break;
case 0x2:
/* Digital output register */
/* 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;
#ifdef DEBUG_FLOPPY
printf("Floppy digital output register: 0x%02x\n", retval);
#endif
break;
case 0x3:
/* Tape drive register */
/* Disk boot selection indicator */
retval |= fdctrl.bootsel << 2;
/* Tape indicators: never allowed */
#ifdef DEBUG_FLOPPY
printf("Floppy tape drive register: 0x%02x\n", retval);
#endif
break;
case 0x4:
/* Main status register */
fdctrl.state &= ~FD_CTRL_SLEEP;
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 (fdctrl.data_state == FD_STATE_DATA ||
fdctrl.data_state == FD_STATE_STATUS)
retval |= 0x10;
#ifdef DEBUG_FLOPPY
printf("Floppy main status register: 0x%02x\n", retval);
#endif
break;
case 0x5:
/* Data register */
fdctrl.state &= ~FD_CTRL_SLEEP;
if (fdctrl.data_state != FD_STATE_CMD) {
pos = fdctrl.data_pos;
if (fdctrl.data_state == FD_STATE_DATA) {
pos %= FD_FIFO_LEN;
if (pos == 0) {
len = fdctrl.data_len - fdctrl.data_pos;
if (len > FD_FIFO_LEN)
len = FD_FIFO_LEN;
bdrv_read(cur_drv->bs, fd_sector(cur_drv),
fdctrl.fifo, len);
}
}
retval = fdctrl.fifo[pos];
if (++fdctrl.data_pos == fdctrl.data_len) {
fdctrl.data_pos = 0;
/* Switch from transfert mode to status mode
* then from status mode to command mode
*/
if (--fdctrl.data_state == FD_STATE_STATUS) {
fdctrl_stop_transfer(0x20, 0x00);
} else {
fdctrl.data_dir = FD_DIR_WRITE;
}
}
}
#ifdef DEBUG_FLOPPY
printf("Floppy data register: 0x%02x\n", retval);
#endif
break;
case 0x7:
/* Digital input register */
#ifdef DEBUG_FLOPPY
printf("Floppy digital input register: 0x%02x\n", retval);
#endif
if (drv0->rv | drv1->rv)
retval |= 0x80;
drv0->rv = 0;
drv1->rv = 0;
break;
default:
printf("ERROR: attempt to read from an unknown floppy port:
%x\n",
reg);
break;
}
return retval;
}
--
J. Mayer <address@hidden>
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