. pci_reserve() returns an error on devices that have already been reserved,
instead of panic()ing; the pci_reserve() library call still panics,
pci_reserve_ok() returns an int.
. this allows at_wini to use the instance value as intended, as all devices
are seen, even reserved ones
. only devices actually used by at_wini are pci_reserve()d
. pci doesn't release devices based on argv[0], as at_wini both have the
same name and multiple instances won't work together properly
libdriver. at_wini now queues messages it can't handle it receives when
waiting for an interrupt. this way it can do receive(ANY) and timeouts
should be working again (were broken for VFS, as with the advent of VFS,
at_wini could get requests from a filesystem while it was waiting for an
interrupt - as a hack, the receive() was changed to receive(HARDWARE)).
Added mq.c to libdriver, and made libdriver an actual library that
drivers link with -L../libdriver -ldriver. (So adding files, if
necessary, is easier next time.)
pm: fixed rebooting by making a copy of the monitor code from the user
process. this is necessary because that process is dead by the time
sys_abort() is called.
also added more info to the "can't reply" panic.
boot monitor.
Added SCSI_SENSE command that asks the drive, with request sense, about
diagnostics for the previous error. This command is called and the results
printed when atapi_debug is enabled and atapi errors occur.
Debug output also prints actual commands sent to the drive.
Suddenly, Andy's problem has vanished. Don't know why, minor changes
(e.g. moving the atapi packet data from stack to static) shouldn't have
fixed this.. But with the debug info, we stand a better chance of
finding out what it was if it occurs again.
. added OPENCT ioctl to at driver, which returns the number of times
a device is opened. if it's not opened exactly once, new partition info
will not be read in (at the next open after this close). included
this check in autopart.
