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Diffstat (limited to 'hw/fdc.c')
-rw-r--r--hw/fdc.c55
1 files changed, 32 insertions, 23 deletions
diff --git a/hw/fdc.c b/hw/fdc.c
index 504e9deee1..da90d54e7e 100644
--- a/hw/fdc.c
+++ b/hw/fdc.c
@@ -1,5 +1,5 @@
/*
- * QEMU Floppy disk emulator
+ * QEMU Floppy disk emulator (Intel 82078)
*
* Copyright (c) 2003 Jocelyn Mayer
*
@@ -382,6 +382,7 @@ struct fdctrl_t {
uint8_t data_state;
uint8_t data_dir;
uint8_t int_status;
+ uint8_t eot; /* last wanted sector */
/* States kept only to be returned back */
/* Timers state */
uint8_t timer0;
@@ -762,7 +763,7 @@ static void fdctrl_unimplemented (fdctrl_t *fdctrl)
fdrive_t *cur_drv;
cur_drv = get_cur_drv(fdctrl);
- fdctrl->fifo[0] = 0x60 | (cur_drv->head << 1) | fdctrl->cur_drv;
+ fdctrl->fifo[0] = 0x60 | (cur_drv->head << 2) | fdctrl->cur_drv;
fdctrl->fifo[1] = 0x00;
fdctrl->fifo[2] = 0x00;
fdctrl_set_fifo(fdctrl, 3, 1);
@@ -782,8 +783,8 @@ static void fdctrl_stop_transfer (fdctrl_t *fdctrl, uint8_t status0,
cur_drv = get_cur_drv(fdctrl);
FLOPPY_DPRINTF("transfer status: %02x %02x %02x (%02x)\n",
status0, status1, status2,
- status0 | (cur_drv->head << 1) | fdctrl->cur_drv);
- fdctrl->fifo[0] = status0 | (cur_drv->head << 1) | fdctrl->cur_drv;
+ status0 | (cur_drv->head << 2) | fdctrl->cur_drv);
+ fdctrl->fifo[0] = status0 | (cur_drv->head << 2) | fdctrl->cur_drv;
fdctrl->fifo[1] = status1;
fdctrl->fifo[2] = status2;
fdctrl->fifo[3] = cur_drv->track;
@@ -810,7 +811,7 @@ static void fdctrl_start_transfer (fdctrl_t *fdctrl, int direction)
kt = fdctrl->fifo[2];
kh = fdctrl->fifo[3];
ks = fdctrl->fifo[4];
- FLOPPY_DPRINTF("Start tranfert at %d %d %02x %02x (%d)\n",
+ FLOPPY_DPRINTF("Start tranfer at %d %d %02x %02x (%d)\n",
fdctrl->cur_drv, kh, kt, ks,
_fd_sector(kh, kt, ks, cur_drv->last_sect));
did_seek = 0;
@@ -864,6 +865,7 @@ static void fdctrl_start_transfer (fdctrl_t *fdctrl, int direction)
tmp += cur_drv->last_sect;
fdctrl->data_len *= tmp;
}
+ fdctrl->eot = fdctrl->fifo[6];
if (fdctrl->dma_en) {
int dma_mode;
/* DMA transfer are enabled. Check if DMA channel is well programmed */
@@ -924,14 +926,14 @@ static int fdctrl_transfer_handler (void *opaque, target_ulong addr, int size)
status2 = 0x04;
if (size > fdctrl->data_len)
size = fdctrl->data_len;
- if (cur_drv->bs == NULL) {
+ if (cur_drv->bs == NULL) {
if (fdctrl->data_dir == FD_DIR_WRITE)
fdctrl_stop_transfer(fdctrl, 0x60, 0x00, 0x00);
else
fdctrl_stop_transfer(fdctrl, 0x40, 0x00, 0x00);
len = 0;
- goto transfer_error;
- }
+ goto transfer_error;
+ }
rel_pos = fdctrl->data_pos % FD_SECTOR_LEN;
for (start_pos = fdctrl->data_pos; fdctrl->data_pos < size;) {
len = size - fdctrl->data_pos;
@@ -952,7 +954,7 @@ static int fdctrl_transfer_handler (void *opaque, target_ulong addr, int size)
/* Sure, image size is too small... */
memset(fdctrl->fifo, 0, FD_SECTOR_LEN);
}
- }
+ }
switch (fdctrl->data_dir) {
case FD_DIR_READ:
/* READ commands */
@@ -968,7 +970,7 @@ static int fdctrl_transfer_handler (void *opaque, target_ulong addr, int size)
FLOPPY_ERROR("writting sector %d\n", fd_sector(cur_drv));
fdctrl_stop_transfer(fdctrl, 0x60, 0x00, 0x00);
goto transfer_error;
- }
+ }
break;
default:
/* SCAN commands */
@@ -994,30 +996,34 @@ static int fdctrl_transfer_handler (void *opaque, target_ulong addr, int size)
rel_pos = fdctrl->data_pos % FD_SECTOR_LEN;
if (rel_pos == 0) {
/* Seek to next sector */
- cur_drv->sect++;
FLOPPY_DPRINTF("seek to next sector (%d %02x %02x => %d) (%d)\n",
cur_drv->head, cur_drv->track, cur_drv->sect,
fd_sector(cur_drv),
fdctrl->data_pos - size);
- if (cur_drv->sect > cur_drv->last_sect) {
+ /* XXX: cur_drv->sect >= cur_drv->last_sect should be an
+ error in fact */
+ if (cur_drv->sect >= cur_drv->last_sect ||
+ cur_drv->sect == fdctrl->eot) {
cur_drv->sect = 1;
if (FD_MULTI_TRACK(fdctrl->data_state)) {
if (cur_drv->head == 0 &&
(cur_drv->flags & FDISK_DBL_SIDES) != 0) {
- cur_drv->head = 1;
- } else {
- cur_drv->head = 0;
+ cur_drv->head = 1;
+ } else {
+ cur_drv->head = 0;
cur_drv->track++;
if ((cur_drv->flags & FDISK_DBL_SIDES) == 0)
break;
+ }
+ } else {
+ cur_drv->track++;
+ break;
}
- } else {
- cur_drv->track++;
- break;
- }
FLOPPY_DPRINTF("seek to next track (%d %02x %02x => %d)\n",
cur_drv->head, cur_drv->track,
cur_drv->sect, fd_sector(cur_drv));
+ } else {
+ cur_drv->sect++;
}
}
}
@@ -1033,7 +1039,7 @@ end_transfer:
status0 |= 0x20;
fdctrl->data_len -= len;
// if (fdctrl->data_len == 0)
- fdctrl_stop_transfer(fdctrl, status0, status1, status2);
+ fdctrl_stop_transfer(fdctrl, status0, status1, status2);
transfer_error:
return len;
@@ -1066,7 +1072,7 @@ static uint32_t fdctrl_read_data (fdctrl_t *fdctrl)
retval = fdctrl->fifo[pos];
if (++fdctrl->data_pos == fdctrl->data_len) {
fdctrl->data_pos = 0;
- /* Switch from transfert mode to status mode
+ /* Switch from transfer mode to status mode
* then from status mode to command mode
*/
if (FD_STATE(fdctrl->data_state) == FD_STATE_DATA) {
@@ -1170,7 +1176,7 @@ static void fdctrl_write_data (fdctrl_t *fdctrl, uint32_t value)
bdrv_write(cur_drv->bs, fd_sector(cur_drv),
fdctrl->fifo, FD_SECTOR_LEN);
}
- /* Switch from transfert mode to status mode
+ /* Switch from transfer mode to status mode
* then from status mode to command mode
*/
if (FD_STATE(fdctrl->data_state) == FD_STATE_DATA)
@@ -1510,7 +1516,9 @@ enqueue:
/* 1 Byte status back */
fdctrl->fifo[0] = (cur_drv->ro << 6) |
(cur_drv->track == 0 ? 0x10 : 0x00) |
- fdctrl->cur_drv;
+ (cur_drv->head << 2) |
+ fdctrl->cur_drv |
+ 0x28;
fdctrl_set_fifo(fdctrl, 1, 0);
break;
case 0x07:
@@ -1581,6 +1589,7 @@ enqueue:
/* READ_ID */
FLOPPY_DPRINTF("treat READ_ID command\n");
/* XXX: should set main status register to busy */
+ cur_drv->head = (fdctrl->fifo[1] >> 2) & 1;
qemu_mod_timer(fdctrl->result_timer,
qemu_get_clock(vm_clock) + (ticks_per_sec / 50));
break;
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-15 21:42:44 +0000