diff options
Diffstat (limited to 'hw/fdc.c')
| -rw-r--r-- | hw/fdc.c | 132 |
1 files changed, 118 insertions, 14 deletions
@@ -52,6 +52,113 @@ /********************************************************/ /* Floppy drive emulation */ +typedef enum FDriveRate { + FDRIVE_RATE_500K = 0x00, /* 500 Kbps */ + FDRIVE_RATE_300K = 0x01, /* 300 Kbps */ + FDRIVE_RATE_250K = 0x02, /* 250 Kbps */ + FDRIVE_RATE_1M = 0x03, /* 1 Mbps */ +} FDriveRate; + +typedef struct FDFormat { + FDriveType drive; + uint8_t last_sect; + uint8_t max_track; + uint8_t max_head; + FDriveRate rate; +} FDFormat; + +static const FDFormat fd_formats[] = { + /* First entry is default format */ + /* 1.44 MB 3"1/2 floppy disks */ + { FDRIVE_DRV_144, 18, 80, 1, FDRIVE_RATE_500K, }, + { FDRIVE_DRV_144, 20, 80, 1, FDRIVE_RATE_500K, }, + { FDRIVE_DRV_144, 21, 80, 1, FDRIVE_RATE_500K, }, + { FDRIVE_DRV_144, 21, 82, 1, FDRIVE_RATE_500K, }, + { FDRIVE_DRV_144, 21, 83, 1, FDRIVE_RATE_500K, }, + { FDRIVE_DRV_144, 22, 80, 1, FDRIVE_RATE_500K, }, + { FDRIVE_DRV_144, 23, 80, 1, FDRIVE_RATE_500K, }, + { FDRIVE_DRV_144, 24, 80, 1, FDRIVE_RATE_500K, }, + /* 2.88 MB 3"1/2 floppy disks */ + { FDRIVE_DRV_288, 36, 80, 1, FDRIVE_RATE_1M, }, + { FDRIVE_DRV_288, 39, 80, 1, FDRIVE_RATE_1M, }, + { FDRIVE_DRV_288, 40, 80, 1, FDRIVE_RATE_1M, }, + { FDRIVE_DRV_288, 44, 80, 1, FDRIVE_RATE_1M, }, + { FDRIVE_DRV_288, 48, 80, 1, FDRIVE_RATE_1M, }, + /* 720 kB 3"1/2 floppy disks */ + { FDRIVE_DRV_144, 9, 80, 1, FDRIVE_RATE_250K, }, + { FDRIVE_DRV_144, 10, 80, 1, FDRIVE_RATE_250K, }, + { FDRIVE_DRV_144, 10, 82, 1, FDRIVE_RATE_250K, }, + { FDRIVE_DRV_144, 10, 83, 1, FDRIVE_RATE_250K, }, + { FDRIVE_DRV_144, 13, 80, 1, FDRIVE_RATE_250K, }, + { FDRIVE_DRV_144, 14, 80, 1, FDRIVE_RATE_250K, }, + /* 1.2 MB 5"1/4 floppy disks */ + { FDRIVE_DRV_120, 15, 80, 1, FDRIVE_RATE_500K, }, + { FDRIVE_DRV_120, 18, 80, 1, FDRIVE_RATE_500K, }, + { FDRIVE_DRV_120, 18, 82, 1, FDRIVE_RATE_500K, }, + { FDRIVE_DRV_120, 18, 83, 1, FDRIVE_RATE_500K, }, + { FDRIVE_DRV_120, 20, 80, 1, FDRIVE_RATE_500K, }, + /* 720 kB 5"1/4 floppy disks */ + { FDRIVE_DRV_120, 9, 80, 1, FDRIVE_RATE_250K, }, + { FDRIVE_DRV_120, 11, 80, 1, FDRIVE_RATE_250K, }, + /* 360 kB 5"1/4 floppy disks */ + { FDRIVE_DRV_120, 9, 40, 1, FDRIVE_RATE_300K, }, + { FDRIVE_DRV_120, 9, 40, 0, FDRIVE_RATE_300K, }, + { FDRIVE_DRV_120, 10, 41, 1, FDRIVE_RATE_300K, }, + { FDRIVE_DRV_120, 10, 42, 1, FDRIVE_RATE_300K, }, + /* 320 kB 5"1/4 floppy disks */ + { FDRIVE_DRV_120, 8, 40, 1, FDRIVE_RATE_250K, }, + { FDRIVE_DRV_120, 8, 40, 0, FDRIVE_RATE_250K, }, + /* 360 kB must match 5"1/4 better than 3"1/2... */ + { FDRIVE_DRV_144, 9, 80, 0, FDRIVE_RATE_250K, }, + /* end */ + { FDRIVE_DRV_NONE, -1, -1, 0, 0, }, +}; + +static void pick_geometry(BlockDriverState *bs, int *nb_heads, + int *max_track, int *last_sect, + FDriveType drive_in, FDriveType *drive, + FDriveRate *rate) +{ + const FDFormat *parse; + uint64_t nb_sectors, size; + int i, first_match, match; + + bdrv_get_geometry(bs, &nb_sectors); + match = -1; + first_match = -1; + for (i = 0; ; i++) { + parse = &fd_formats[i]; + if (parse->drive == FDRIVE_DRV_NONE) { + break; + } + if (drive_in == parse->drive || + drive_in == 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; + *drive = parse->drive; + *rate = parse->rate; +} + #define GET_CUR_DRV(fdctrl) ((fdctrl)->cur_drv) #define SET_CUR_DRV(fdctrl, drive) ((fdctrl)->cur_drv = (drive)) @@ -187,8 +294,8 @@ static void fd_revalidate(FDrive *drv) FLOPPY_DPRINTF("revalidate\n"); if (drv->bs != NULL) { ro = bdrv_is_read_only(drv->bs); - bdrv_get_floppy_geometry_hint(drv->bs, &nb_heads, &max_track, - &last_sect, drv->drive, &drive, &rate); + pick_geometry(drv->bs, &nb_heads, &max_track, + &last_sect, drv->drive, &drive, &rate); if (!bdrv_is_inserted(drv->bs)) { FLOPPY_DPRINTF("No disk in drive\n"); } else { @@ -1695,7 +1802,7 @@ static void fdctrl_handle_drive_specification_command(FDCtrl *fdctrl, int direct } } -static void fdctrl_handle_relative_seek_out(FDCtrl *fdctrl, int direction) +static void fdctrl_handle_relative_seek_in(FDCtrl *fdctrl, int direction) { FDrive *cur_drv; @@ -1705,14 +1812,15 @@ static void fdctrl_handle_relative_seek_out(FDCtrl *fdctrl, int direction) fd_seek(cur_drv, cur_drv->head, cur_drv->max_track - 1, cur_drv->sect, 1); } else { - fd_seek(cur_drv, cur_drv->head, fdctrl->fifo[2], cur_drv->sect, 1); + fd_seek(cur_drv, cur_drv->head, + cur_drv->track + fdctrl->fifo[2], cur_drv->sect, 1); } fdctrl_reset_fifo(fdctrl); /* Raise Interrupt */ fdctrl_raise_irq(fdctrl, FD_SR0_SEEK); } -static void fdctrl_handle_relative_seek_in(FDCtrl *fdctrl, int direction) +static void fdctrl_handle_relative_seek_out(FDCtrl *fdctrl, int direction) { FDrive *cur_drv; @@ -1721,7 +1829,8 @@ static void fdctrl_handle_relative_seek_in(FDCtrl *fdctrl, int direction) if (fdctrl->fifo[2] > cur_drv->track) { fd_seek(cur_drv, cur_drv->head, 0, cur_drv->sect, 1); } else { - fd_seek(cur_drv, cur_drv->head, fdctrl->fifo[2], cur_drv->sect, 1); + fd_seek(cur_drv, cur_drv->head, + cur_drv->track - fdctrl->fifo[2], cur_drv->sect, 1); } fdctrl_reset_fifo(fdctrl); /* Raise Interrupt */ @@ -2054,18 +2163,13 @@ static int sun4m_fdc_init1(SysBusDevice *dev) return fdctrl_init_common(fdctrl); } -void fdc_get_bs(BlockDriverState *bs[], ISADevice *dev) +FDriveType isa_fdc_get_drive_type(ISADevice *fdc, int i) { - FDCtrlISABus *isa = DO_UPCAST(FDCtrlISABus, busdev, dev); - FDCtrl *fdctrl = &isa->state; - int i; + FDCtrlISABus *isa = DO_UPCAST(FDCtrlISABus, busdev, fdc); - for (i = 0; i < MAX_FD; i++) { - bs[i] = fdctrl->drives[i].bs; - } + return isa->state.drives[i].drive; } - static const VMStateDescription vmstate_isa_fdc ={ .name = "fdc", .version_id = 2, |