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bochs: catch division by zero in floppy controller

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This change fixes another Bochs crash in the floppy controller,
triggered by one out of 670 million experiments in my current
campaign.

Change-Id: I8a2ff78c9d2c8fca12eefb97f508bc213373bbfa
This commit is contained in:
Horst Schirmeier
2014-04-09 01:05:01 +02:00
parent cfd99fe3af
commit b1c9c295ca
1 changed files with 6 additions and 0 deletions
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6
simulators/bochs/iodev/floppy.cc
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@ -1274,6 +1274,12 @@ void bx_floppy_ctrl_c::dma_write(Bit8u *data_byte)
if (!(BX_FD_THIS s.main_status_reg & FD_MS_NDMA)) { if (!(BX_FD_THIS s.main_status_reg & FD_MS_NDMA)) {
DEV_dma_set_drq(FLOPPY_DMA_CHAN, 0); DEV_dma_set_drq(FLOPPY_DMA_CHAN, 0);
} }
// DanceOS
if (BX_FD_THIS s.media[drive].sectors_per_track == 0) {
return;
}
// time to read one sector at 300 rpm // time to read one sector at 300 rpm
sector_time = 200000 / BX_FD_THIS s.media[drive].sectors_per_track; sector_time = 200000 / BX_FD_THIS s.media[drive].sectors_per_track;
bx_pc_system.activate_timer(BX_FD_THIS s.floppy_timer_index, bx_pc_system.activate_timer(BX_FD_THIS s.floppy_timer_index,