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3B2: Do not read from detached floppy

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The Rev 3 firmware does not check floppy controller status before
commanding a sector read, which can lead to calling sim_disk_rdsect()
on a detached unit. With this checkin, the simulator will no longer
attempt a read or write if the floppy unit is not attached.
This commit is contained in:
Seth Morabito 2021-08-10 19:29:41 -07:00
parent 87eab8a53c
commit 5fd9ee3909
1 changed files with 6 additions and 0 deletions
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6
3B2/3b2_if.c
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@ -554,6 +554,12 @@ void if_write(uint32 pa, uint32 val, size_t size)
if_state.cmd = (uint8) val; if_state.cmd = (uint8) val;
/* Writing to the command register always de-asserts the IRQ line */ /* Writing to the command register always de-asserts the IRQ line */
if_clear_irq(); if_clear_irq();
if ((uptr->flags & UNIT_ATT) == 0) {
/* If not attached, do nothing */
break;
}
if_handle_command(); if_handle_command();
break; break;
case IF_TRACK_REG: case IF_TRACK_REG: