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- attempt to fix bug [ #439945 ] Floppy drive read input error checking.

This commit is contained in:
Bryce Denney 2001-09-29 03:29:27 +00:00
parent 309ae53cd6
commit 0640ab3b04
1 changed files with 23 additions and 1 deletions
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24
bochs/iodev/floppy.cc
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@ -81,7 +81,7 @@ bx_floppy_ctrl_c::~bx_floppy_ctrl_c(void)
void
bx_floppy_ctrl_c::init(bx_devices_c *d, bx_cmos_c *cmos)
{
BX_DEBUG(("Init $Id: floppy.cc,v 1.20 2001-09-26 17:35:51 bdenney Exp $"));
BX_DEBUG(("Init $Id: floppy.cc,v 1.21 2001-09-29 03:29:27 bdenney Exp $"));
BX_FD_THIS devices = d;
BX_FD_THIS devices->register_irq(6, "Floppy Drive");
@ -735,6 +735,28 @@ bx_floppy_ctrl_c::floppy_command(void)
if (head > 1)
BX_PANIC(("io: bad head #"));
// check that head number in command[1] bit two matches the head
// reported in the head number field. Real floppy drives are
// picky about this, as reported in SF bug #439945, (Floppy drive
// read input error checking).
if (head != (BX_FD_THIS s.command[1]>>2)&1) {
BX_ERROR(("head number in command[1] doesn't match head field"));
BX_FD_THIS s.result_size = 7;
BX_FD_THIS s.result_index = 0;
BX_FD_THIS s.result[0] = 0x40 | (BX_FD_THIS s.head[drive]<<2) | drive; // abnormal termination
BX_FD_THIS s.result[1] = 0x04; // 0000 0100
BX_FD_THIS s.result[2] = 0x00; // 0000 0000
BX_FD_THIS s.result[3] = BX_FD_THIS s.cylinder[drive];
BX_FD_THIS s.result[4] = BX_FD_THIS s.head[drive];
BX_FD_THIS s.result[5] = BX_FD_THIS s.sector[drive];
BX_FD_THIS s.result[6] = 2; // sector size = 512
BX_FD_THIS s.pending_command = 0;
BX_FD_THIS s.main_status_reg = FD_MS_MRQ | FD_MS_DIO | FD_MS_BUSY;
BX_FD_THIS devices->pic->trigger_irq(6);
return;
}
if ( BX_FD_THIS s.media_present[drive] == 0 ) {
// media not in drive, return error