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History log of /src/sys/arch/sparc/dev/fd.c
RevisionDateAuthorComments
 1.164  11-Dec-2023  andvar Surround fdc declaration and definition with FD_DEBUG blocks.

FD_DEBUG is defined by default, thus build passes, however would fail otherwise
since it is only used in debug block.
 1.163  07-Aug-2021  thorpej Merge thorpej-cfargs2.
 1.162  24-Apr-2021  thorpej branches: 1.162.8;
Merge thorpej-cfargs branch:

Simplify and make extensible the config_search() / config_found() /
config_attach() interfaces: rather than having different variants for
which arguments you want pass along, just have a single call that
takes a variadic list of tag-value arguments.

Adjust all call sites:
- Simplify wherever possible; don't pass along arguments that aren't
actually needed.
- Don't be explicit about what interface attribute is attaching if
the device only has one. (More simplification.)
- Add a config_probe() function to be used in indirect configuiration
situations, making is visibly easier to see when indirect config is
in play, and allowing for future change in semantics. (As of now,
this is just a wrapper around config_match(), but that is an
implementation detail.)

Remove unnecessary or redundant interface attributes where they're not
needed.

There are currently 5 "cfargs" defined:
- CFARG_SUBMATCH (submatch function for direct config)
- CFARG_SEARCH (search function for indirect config)
- CFARG_IATTR (interface attribte)
- CFARG_LOCATORS (locators array)
- CFARG_DEVHANDLE (devhandle_t - wraps OFW, ACPI, etc. handles)

...and a sentinel value CFARG_EOL.

Add some extra sanity checking to ensure that interface attributes
aren't ambiguous.

Use CFARG_DEVHANDLE in MI FDT, OFW, and ACPI code, and macppc and shark
ports to associate those device handles with device_t instance. This
will trickle trough to more places over time (need back-end for pre-OFW
Sun OBP; any others?).
 1.161  22-Nov-2020  thorpej branches: 1.161.2;
malloc(9) -> kmem(9) (easy, straight-forward cases only, for now)
 1.160  10-Nov-2019  chs branches: 1.160.8;
in many device attach paths, allocate memory with M_WAITOK instead of M_NOWAIT
and remove code to handle failures that can no longer happen.
 1.159  08-Feb-2019  mrg make *fd*.c's fd_dev_to_type() always a static inline. some
have it as a const, and have code to copy the defaults to
modify them before using them, but that probably requires a
real test to feel confident in changing.
 1.158  03-Sep-2018  riastradh Rename min/max -> uimin/uimax for better honesty.

These functions are defined on unsigned int. The generic name
min/max should not silently truncate to 32 bits on 64-bit systems.
This is purely a name change -- no functional change intended.

HOWEVER! Some subsystems have

#define min(a, b) ((a) < (b) ? (a) : (b))
#define max(a, b) ((a) > (b) ? (a) : (b))

even though our standard name for that is MIN/MAX. Although these
may invite multiple evaluation bugs, these do _not_ cause integer
truncation.

To avoid `fixing' these cases, I first changed the name in libkern,
and then compile-tested every file where min/max occurred in order to
confirm that it failed -- and thus confirm that nothing shadowed
min/max -- before changing it.

I have left a handful of bootloaders that are too annoying to
compile-test, and some dead code:

cobalt ews4800mips hp300 hppa ia64 luna68k vax
acorn32/if_ie.c (not included in any kernels)
macppc/if_gm.c (superseded by gem(4))

It should be easy to fix the fallout once identified -- this way of
doing things fails safe, and the goal here, after all, is to _avoid_
silent integer truncations, not introduce them.

Maybe one day we can reintroduce min/max as type-generic things that
never silently truncate. But we should avoid doing that for a while,
so that existing code has a chance to be detected by the compiler for
conversion to uimin/uimax without changing the semantics until we can
properly audit it all. (Who knows, maybe in some cases integer
truncation is actually intended!)
 1.157  26-Apr-2015  mlelstv branches: 1.157.16; 1.157.18;
Use C99-style initializers for struct dkdriver.
 1.156  02-Jan-2015  christos We have three sets of DTYPE_ constants in the kernel:
altq Drop Type
disklabel Disk Type
file Descriptor Type
(not to mention constants that contain the string DTYPE).
Let's make them two, by changing the disklabel one to be DisK TYPE since the
other disklabel constants seem to do that. Not many userland programs use
these constants (and the ones that they do are mostly in ifdefs). They will
be fixed shortly.
 1.155  19-Aug-2014  tsutsui branches: 1.155.2;
Fix panic() on opening fd(4), caused by a wrong pointer passed to memset().

I'm not sure why this 18 year old bug didn't cause problem before
(at least my old 5.99.23 kernel worked), but probably it's triggered
by new gcc 4.8 which might do more aggressive memory allocation.
The problem is found by Nobuyoshi Sato on trying eject(1) against fd(4).

Should be pulled up to netbsd-7.
 1.154  25-Jul-2014  dholland branches: 1.154.2;
Add d_discard to all struct cdevsw instances I could find.

All have been set to "nodiscard"; some should get a real implementation.
 1.153  25-Jul-2014  dholland Add d_discard to all struct bdevsw instances I could find.

I've set them all to nodiscard. Some of them (wd, dk, vnd, ld,
raidframe, maybe cgd) should be implemented for real.
 1.152  16-Mar-2014  dholland branches: 1.152.2;
Change (mostly mechanically) every cdevsw/bdevsw I can find to use
designated initializers.

I have not built every extant kernel so I have probably broken at
least one build; however I've also found and fixed some wrong
cdevsw/bdevsw entries so even if so I think we come out ahead.
 1.151  10-Oct-2012  tsutsui branches: 1.151.2;
Fix device_t/softc split botches that could be fatal. From
Chuck Silvers' patch posted current-users and tech-kern:
http://mail-index.netbsd.org/current-users/2012/10/09/msg021233.html

Should be pulled up to netbsd-6.
 1.150  17-Jul-2011  mrg branches: 1.150.2; 1.150.8; 1.150.12; 1.150.14;
convert all the sparc drivers that attach on my ss20 to use device_t,
cfdata_t and CFATTACH_DECL_NEW().

fd/fdc could use better testing, but i'm pretty sure i got it right.
 1.149  24-Feb-2010  dyoung A pointer typedef entails trading too much flexibility to declare const
and non-const types, and the kernel uses both const and non-const
PMF qualifiers and device suspensors, so change the pmf_qual_t and
device_suspensor_t typedefs from "pointers to const" to non-pointer,
non-const types.
 1.148  08-Jan-2010  dyoung branches: 1.148.2;
Expand PMF_FN_* macros.
 1.147  19-Dec-2009  tsutsui Disable "fast trap" handlers which invoke software interrupts
in sparc/amd7930intr.s and sparc/bsd_fdintr.s until they are
rewritten to adapt new MI softint(9) API.

No particular comments on PR port-sparc/42192, but
this fixes timeout problem on floppy access on my SPARCstation 1+.

XXX: floppy support on sun4m seems to have another problem (data overrun).
 1.146  25-May-2009  jnemeth Convert shutdownhook_establish() to pmf_device_register1().

XXX This should be done as part of an overall plan to support
power management and device detachment. However, in order to do
that, I would first have to invent sbus_intr_disestablish(). This
is being done at this time in order to aid in the effort to eliminate
shutdownhook_establish().

This was based on the sys/arch/sparc64/fd.c change. Thanks to jdc@
for testing this version.
 1.145  18-Mar-2009  cegger bzero -> memset
 1.144  13-Jan-2009  yamt branches: 1.144.2;
g/c BUFQ_FOO() macros and use bufq_foo() directly.
 1.143  17-Dec-2008  cegger kill MALLOC and FREE macros.
 1.142  16-Dec-2008  christos replace bitmask_snprintf(9) with snprintb(3)
 1.141  11-Jun-2008  drochner branches: 1.141.4; 1.141.6; 1.141.12;
mechanical changes to use device_private() or device_lookup_private()
to get softcs, makes the code compile under the stricter type checking
introduced earlier today
 1.140  28-Apr-2008  martin branches: 1.140.2; 1.140.4;
Remove clause 3 and 4 from TNF licenses
 1.139  02-Jan-2008  ad branches: 1.139.6; 1.139.8; 1.139.10;
Merge vmlocking2 to head.
 1.138  27-Nov-2007  ad branches: 1.138.2; 1.138.6;
Use the softint API.
 1.137  17-Oct-2007  garbled branches: 1.137.2;
Merge the ppcoea-renovation branch to HEAD.

This branch was a major cleanup and rototill of many of the various OEA
cpu based PPC ports that focused on sharing as much code as possible
between the various ports to eliminate near-identical copies of files in
every tree. Additionally there is a new PIC system that unifies the
interface to interrupt code for all different OEA ppc arches. The work
for this branch was done by a variety of people, too long to list here.

TODO:
bebox still needs work to complete the transition to -renovation.
ofppc still needs a bunch of work, which I will be looking at.
ev64260 still needs to be renovated
amigappc was not attempted.

NOTES:
pmppc was removed as an arch, and moved to a evbppc target.
 1.136  08-Oct-2007  ad Merge disk init changes from the vmlocking branch. These seperate init /
destroy of 'struct disk' from attach / detach.
 1.135  29-Jul-2007  ad branches: 1.135.4; 1.135.6; 1.135.8;
It's not a good idea for device drivers to modify b_flags, as they don't
need to understand the locking around that field. Instead of setting
B_ERROR, set b_error instead. b_error is 'owned' by whoever completes
the I/O request.
 1.134  09-Jul-2007  ad branches: 1.134.2; 1.134.4;
Merge some of the less invasive changes from the vmlocking branch:

- kthread, callout, devsw API changes
- select()/poll() improvements
- miscellaneous MT safety improvements
 1.133  11-May-2007  jnemeth Fixed formatting. Problem was that we were trying to get the result
of a data transfer operation immediately after the data transfer
was finished, instead of waiting for the chip to interrupt us and
tell us that it was finished and had the result for us. This worked
okay for read and write since the operation would be finished very
shortly after the data transfer completed. However, with formatting,
the chip still had most of the rest of the track to do, so we ended
up timing out before the operation was finished. This fix is from
sparc64/dev/fdc.c and was tested on sparc by tnn@.
 1.132  11-May-2007  jnemeth revert last; committed wrong file
 1.131  11-May-2007  jnemeth Fixed formatting. Problem was that we were trying to get the result
of a data transfer operation immediately after the data transfer
was finished, instead of waiting for the chip to interrupt us and
tell us that it was finished and had the result for us. This worked
okay for read and write since the operation would be finished very
shortly after the data transfer completed. However, with formatting,
the chip still had most of the rest of the track to do, so we ended
up timing out before the operation was finished. This fix is from
sparc64/dev/fdc.c and was tested on sparc by tnn@.
 1.130  09-Mar-2007  he branches: 1.130.2; 1.130.4; 1.130.10;
Cast to char* before doing pointer arithmetic.
 1.129  04-Mar-2007  mrg fix fall out from caddr_t changes.
 1.128  04-Mar-2007  christos Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.
 1.127  15-Feb-2007  reinoud branches: 1.127.2;
Rename the B_XXX flag to B_DEVPRIVATE flag since it was never used for
debugging and its main use is in device drivers. Its used there to signal
that the flagged buffer has a special meaning or should be handled
differently.

OK'd by Bill Sudenmund on tech-kern.
 1.126  14-Apr-2006  blymn Make i/o statistics collection more generic, include tape drives and
nfs mounts in the set of devices that statistics will be reported on.
 1.125  23-Feb-2006  thorpej branches: 1.125.2; 1.125.4; 1.125.6;
Use device_parent().
 1.124  06-Jan-2006  yamt branches: 1.124.2; 1.124.4;
initialize necessary members of struct buf. PR/32462 from Reinoud Zandijk.
 1.123  04-Jan-2006  yamt add a missing putiobuf in the previous. pointed by Thomas Klausner.
 1.122  04-Jan-2006  yamt - add simple functions to allocate/free a buffer for i/o.
- make bufpool static.
 1.121  11-Dec-2005  christos branches: 1.121.2;
merge ktrace-lwp.
 1.120  16-Nov-2005  uwe ANSIify function declarations/defintions. Use uint<N>_t.
Propagate "static" to function definitions. Drop trailing whitespace.
Same binary code is produced for GENERIC.MP + KGDB + DDB.
 1.119  01-Nov-2005  bjh21 branches: 1.119.2;
Fix second "no drives attached" message (as seen on sun4c) so as not to
include the device name, since this message is printed on the same line
as the attach message anyway.
 1.118  15-Oct-2005  yamt branches: 1.118.2;
- change the way to specify a bufq strategy. (by string rather than by number)
- rather than embedding bufq_state in driver softc,
have a pointer to the former.
- move bufq related functions from kern/subr_disk.c to kern/subr_bufq.c.
- rename method to strategy for consistency.
- move some definitions which don't need to be exposed to the rest of kernel
from sys/bufq.h to sys/bufq_impl.h.
(is it better to move it to kern/ or somewhere?)
- fix some obvious breakage in dev/qbus/ts.c. (not tested)
 1.117  04-Jun-2005  tsutsui branches: 1.117.2;
- Add const.
- Remove parameter names from prototype declarations.
 1.116  28-Oct-2004  yamt move buffer queue related stuffs from buf.h to their own header, bufq.h.
 1.115  19-Sep-2004  he Fix build problem -- track the change to <sys/buf.h>.
 1.114  24-Mar-2004  pk Remove my name from the old UCB copyright notice, thereby reducing its
reference count to 1.
 1.113  17-Mar-2004  pk Rename PROM_getprop*() => prom_getprop*().
 1.112  07-Aug-2003  agc Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.
 1.111  15-Jul-2003  lukem __KERNEL_RCSID()
 1.110  11-Jul-2003  pk Deal with disk change notification.
 1.109  29-Jun-2003  fvdl branches: 1.109.2;
Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.
 1.108  29-Jun-2003  darrenr More changes for providing lwpid for ktrace (sparc GENERIC built)
 1.107  18-Jun-2003  drochner don't #include <sys/dkstat.h> where it is (appearently) unused
 1.106  03-May-2003  wiz DMA, not dma nor Dma.
 1.105  25-Feb-2003  thorpej Add missing splbio() protecting of bufpool access. Add a clarifying
comment to <sys/buf.h> reminding everyone of the need for splbio().
 1.104  25-Feb-2003  thorpej Add a new BUF_INIT() macro which initializes b_dep and b_interlock, and
use it. This fixes a few places where either b_dep or b_interlock were
not properly initialized.
 1.103  05-Feb-2003  pk Make the buffer cache code MP-safe.
 1.102  30-Jan-2003  hannken Fix printf() problem caused by "daddr_t" change.
 1.101  24-Jan-2003  fvdl Bump daddr_t to 64 bits. Replace it with int32_t in all places where
it was used on-disk, so that on-disk formats remain the same.
Remove ufs_daddr_t and ufs_lbn_t for the time being.
 1.100  01-Jan-2003  thorpej Use aprint_normal() for cfprint routines.
 1.99  10-Dec-2002  pk Remove the `flags' argument from bus_intr_establish().
 1.98  10-Dec-2002  pk The `fast trap' handlers are now pssed as an optional argument to
bus_intr_establish(). Allow fall-back on a regular interrupt handler if
the interrupt level must be shared with another device.
 1.97  09-Dec-2002  pk Finish the switch to the softintr(9) framework.

To make this work, we now have to use separate handler lists for hardware
and software interrupts as the soft interrupt handlers do not return
an `interrupt handled' status.

Thanks to Matt Fredette for providing an initial set of patches on port-sparc.
 1.96  01-Nov-2002  mrg implement separate read/write disk statistics:
- disk_unbusy() gets a new parameter to tell the IO direction.
- struct disk_sysctl gets 4 new members for read/write bytes/transfers.
when processing hw.diskstats, add the read&write bytes/transfers for
the old combined stats to attempt to keep backwards compatibility.

unfortunately, due to multiple bugs, this will cause new kernels and old
vmstat/iostat/systat programs to fail. however, the next time this is
change it will not fail again.

this is just the kernel portion.
 1.95  23-Oct-2002  jdolecek merge kqueue branch into -current

kqueue provides a stateful and efficient event notification framework
currently supported events include socket, file, directory, fifo,
pipe, tty and device changes, and monitoring of processes and signals

kqueue is supported by all writable filesystems in NetBSD tree
(with exception of Coda) and all device drivers supporting poll(2)

based on work done by Jonathan Lemon for FreeBSD
initial NetBSD port done by Luke Mewburn and Jason Thorpe
 1.94  02-Oct-2002  thorpej Add trailing ; to CFATTACH_DECL.
 1.93  01-Oct-2002  thorpej Use CFATTACH_DECL().
 1.92  27-Sep-2002  thorpej Declare all cfattach structures const.
 1.91  06-Sep-2002  gehenna Merge the gehenna-devsw branch into the trunk.

This merge changes the device switch tables from static array to
dynamically generated by config(8).

- All device switches is defined as a constant structure in device drivers.

- The new grammer ``device-major'' is introduced to ``files''.

device-major <prefix> char <num> [block <num>] [<rules>]

- All device major numbers must be listed up in port dependent majors.<arch>
by using this grammer.

- Added the new naming convention.
The name of the device switch must be <prefix>_[bc]devsw for auto-generation
of device switch tables.

- The backward compatibility of loading block/character device
switch by LKM framework is broken. This is necessary to convert
from block/character device major to device name in runtime and vice versa.

- The restriction to assign device major by LKM is completely removed.
We don't need to reserve LKM entries for dynamic loading of device switch.

- In compile time, device major numbers list is packed into the kernel and
the LKM framework will refer it to assign device major number dynamically.
 1.90  06-Aug-2002  hannken Convert to new device buffer queue interface.

Approved by: Paul Kranenburg <pk@netbsd.org>
 1.89  11-Mar-2002  pk branches: 1.89.4;
* `bus_type_t' is gone.
* Use BUS_ADDR() where appropriate to encode I/O space and physical
address offset into a `bus_addr_t' value.
* Drop obio_bus_map() since it's now completely equivalent to bus_space_map()
* Use bus_space_map2() to map device space at a fixed virtual address.
* Remove the virtual address argument from sbus_sbus_addr()
 1.88  26-Sep-2001  eeh branches: 1.88.4;
getprop* -> PROM_getprop*
 1.87  08-Jul-2001  wiz branches: 1.87.2; 1.87.4;
Correct various misspellings of 'transfer' and inflected forms.
 1.86  19-Apr-2001  pk Fix fdc_c_hwintr() and use it as a fall back if the `fast trap' handler
cannot be registered.
 1.85  24-Aug-2000  nathanw branches: 1.85.2;
In fdioctl(), allocate fd_formb dynamically when needed, rather than on
the stack, and remove the no-longer-necessary PHOLD()/PRELE() calls
in fdformat().

(This eliminates 1/3 of the instances of PHOLD()/PRELE() in the kernel code.)

XXX We still have too many mostly-redundant floppy drivers.
 1.84  09-Jul-2000  pk Add a `device class' interrupt level argument (from machine/intr.h)
to bus_interrupt_establish().

It's currently only used in sparc64/dev/psycho.c to assign a CPU interrupt
level to devices in PCI slots.
 1.83  29-Jun-2000  mrg remove include of <vm/vm.h> and <machine/pmap.h>. <vm/vm.h> -> <uvm/uvm_extern.h>
 1.82  04-Jun-2000  cgd branches: 1.82.2;
Implement the more flexiable `evcnt' interface as discussed (briefly) on
tech-kern and now documented in evcnt(9).
 1.81  16-May-2000  thorpej branches: 1.81.2;
Nuke dk_establish() from orbit except from those ports which still use
it to determine the boot device: mvme68k, pc532, macppc, ofppc. Those
platforms should be changed to use device_register(). In the mean time,
those ports defined __BROKEN_DK_ESTABLISH.
 1.80  07-Apr-2000  thorpej Use separate callouts for motor-on and motor-off. Fixes a condition
where the floppy driver would wedge because a motor-on timeout would
be cancelled by another I/O operation cancelling a motor-off timeout.

From enami tsugutomo <enami@sm.sony.co.jp>.
 1.79  24-Mar-2000  hannken Fix a typo from last commit.
 1.78  23-Mar-2000  thorpej New callout mechanism with two major improvements over the old
timeout()/untimeout() API:
- Clients supply callout handle storage, thus eliminating problems of
resource allocation.
- Insertion and removal of callouts is constant time, important as
this facility is used quite a lot in the kernel.

The old timeout()/untimeout() API has been removed from the kernel.
 1.77  07-Feb-2000  thorpej Fix a bug in disksort_*() which caused non-optimal ordering when multiple
active partitions were on a single spindle. Add a b_rawblkno member to
struct buf which contains the non-partition-relative block number to sort
by.
 1.76  07-Feb-2000  pk Don't use PROM the virtual address (if any) for the device registers;
they are not reliably mapped. Also, unmap registers if the device
cannot be configured properly.
 1.75  28-Jan-2000  pk fdcstatus() formatting.
 1.74  24-Jan-2000  pk Report write-protected disks.
 1.73  23-Jan-2000  pk * b_cylin -> b_cylinder; deals with PR9283.
* a few optimizations & misc. style updates.
 1.72  21-Jan-2000  thorpej Update for sys/buf.h/disksort_*() changes.
 1.71  21-Jan-2000  pk Medium sized code overhaul:
* Improve communication between the `hard' and `soft' interrupt handlers
to better distinguish various interrupt sources.
* Eliminate several race conditions where we would set a time out handler
only after starting the command on the hardware.
* Handle most timeouts by resetting the controller; there isn't much chance
of recovery in any other way. Currently, the exception is a timeout
on I/O, in which case we first try to pulse the controller's TC line
in order to abort the pseudo-dma sequence. Apparently, "normal"
conditions can induce such a timeout when there's no disk in the drive.
* Reduce the formatting gap parameter to 0x54.
* On the obio bus, interpret the `status' attribute.
* Minimize console diagnostic output if the errors we get appear to be
caused by the absence of a disk.
 1.70  17-Jan-2000  pk Use bus_space(9) functions to access the controller registers.
Add probes to the attach routines before poking the chip to see
where the registers are located.
 1.69  11-Jan-2000  pk Remove old-style boot device recognition.
 1.68  21-Nov-1999  pk Check presence of Sbus interrupt properties before using them.
 1.67  24-Mar-1999  mrg branches: 1.67.2; 1.67.8; 1.67.14;
completely remove Mach VM support. all that is left is the all the
header files as UVM still uses (most of) these.
 1.66  08-Feb-1999  bouyer Change DIOCEJECT to do what's needed to eject a device before the eject
command (unlock for sd and cd) if no other partitions are open, return
EBUSY otherwise. DIOCEJECT will have the old semantic if its argument is not
0. The old ioctl has been renamed to ODIOCEJECT for binary compatibility.
 1.65  07-Feb-1999  jonathan defopt MEMORY_DISK_{HOOKS,SERVER,IS_ROOT}.
 1.64  15-Aug-1998  mycroft Make copyright notices with my name consistent.
 1.63  29-Jul-1998  pk Deal with sbus attach args changes.
 1.62  04-Jul-1998  jonathan defopt DDB.
 1.61  05-Jun-1998  mrg remove old (now broken) memory disks hooks code.
 1.60  30-Mar-1998  pk Replace direct `sparc_bus_map()' calls with bus space map method.
 1.59  25-Mar-1998  pk Check for a valid PROM virtual address.
 1.58  21-Mar-1998  pk Account for changed bus attachment scheme.
 1.57  10-Feb-1998  mrg - add defopt's for UVM, UVMHIST and PMAP_NEW.
- remove unnecessary UVMHIST_DECL's.
 1.56  05-Feb-1998  mrg initial import of the new virtual memory system, UVM, into -current.

UVM was written by chuck cranor <chuck@maria.wustl.edu>, with some
minor portions derived from the old Mach code. i provided some help
getting swap and paging working, and other bug fixes/ideas. chuck
silvers <chuq@chuq.com> also provided some other fixes.

this is the sparc portion.

this will be KNF'd shortly. :-)
 1.55  12-Jan-1998  thorpej Update for changes to config.
 1.54  19-Oct-1997  pk Nuke 5.25 inch formats.
 1.53  19-Oct-1997  pk Add an odd-ball japanese floppy format (PR#2903).
A good time to get rid of the hard-coded floppy sector size.
 1.52  29-Jul-1997  fair %x -> 0x%x
 1.51  24-May-1997  pk Remove all `bustype' arguments from map[io]dev() and REG2PHYS().
 1.50  02-May-1997  pk * finish off support for the 82077 chip as found on sun4m machines.
* add non-dma mode bit to `specify command', so formatting disks starts
working (thanks to Jeremy Cooper for finding out about this).
 1.49  07-Apr-1997  pk sun4c and sun4m `aux' register bits differ slightly.
 1.48  31-Mar-1997  pk Remove bogon from otherwise unused fdchwintr() function.
 1.47  31-Jan-1997  thorpej Use new machine-independent mountroothook code.
 1.46  01-Jan-1997  pk branches: 1.46.2;
RAMDISK_HOOKS => MEMORY_DISK_HOOKS
 1.45  28-Dec-1996  pk rename: ramdisk => md
 1.44  10-Dec-1996  pk Comply with recent autoconfiguration changes. Diffs graciously
supplied by Chris Demetriou.
 1.43  10-Dec-1996  pk Finish import of floppy formatting code; not really usable yet, lots of
data overruns.
 1.42  08-Dec-1996  pk Import formatting code from the i386 version.
Revise communication between hw & sw interrupt handler.
 1.41  27-Nov-1996  pk Stabilize timeout values in fdcresult() and out_fdc() by adding delay()s.
Noted by Jason Thorpe over in the i386 driver.
 1.40  13-Nov-1996  thorpej Use bitmask_snprintf().
 1.39  13-Oct-1996  christos backout previous kprintf change
 1.38  11-Oct-1996  christos printf -> kprintf, sprintf -> ksprintf
 1.37  27-Aug-1996  cgd change cfprint_t type definition to take a const char *, rather than
a char *, because that's what was really intended, and because
if the print function modifies the string, various things could become
unhappy (so the string should _not_ be modified).
 1.36  20-Jun-1996  pk When booting from a floppy drive and RAMDSK_HOOKS is defined, arrange for
a callback from memory disk driver to load the actual root image.
 1.35  16-Jun-1996  pk bootpath detection: some (newer?) v2 prom versions use actual device address,
e.g. `/fd@1,72000000'.
 1.34  27-May-1996  pk Fix case where sequence state wasn't updated properly, resulting in
`disk_unbusy' panic.
 1.33  29-Apr-1996  pk branches: 1.33.4;
Chip needs much more time to think things over (up to 2 seconds to complete
a `recalibrate' command if no flop present).
 1.32  22-Apr-1996  christos Remove dependency on <sys/cpu.h>
 1.31  10-Apr-1996  pk `bootdv' is gone. Instead, set the device pointer in the `struct bootpath'
that is passed in the attach arguments.
 1.30  01-Apr-1996  christos - remove dependency to dev_conf.h
- remove unneeded casts for %b
 1.29  31-Mar-1996  pk Various cleanup; mostly trailing spaces/tabs.
 1.28  26-Mar-1996  pk Bitfields are unsigned.
 1.27  26-Mar-1996  pk Back to normal printf()s, now that gcc understands `%b'.
 1.26  17-Mar-1996  thorpej New device attachment scheme:

- split softc size and match/attach out from cfdriver into
a new struct cfattach.

- new "attach" directive for files.*. May specify the name of
the cfattach structure, so that devices may be easily attached
to parents with different autoconfiguration semantics.
 1.25  16-Mar-1996  christos fix format in printf()
 1.24  14-Mar-1996  christos Bring prototypes into scope and fix compiler warnings.
 1.23  25-Feb-1996  pk Use CPU-type macros.
 1.22  10-Feb-1996  thorpej In fdcretry(), if we're not using implied seeks, set the state to DOSEEK
rather than SEEKCOMPLETE before retrying the operation. If implied seeks
are being used, the state is set to DOIO (no change). This is why I
couldn't reproduce the disk_unbusy() panic on my SS2; it uses implied
seeks. Patch from John F. Woods <jfw@jfwhome.funhouse.com>
 1.21  30-Jan-1996  thorpej Implement DIOCLOCK. It's a no-op in this driver.
 1.20  16-Jan-1996  thorpej Use a shutdownhook to make sure the drive motor is turned off
at halt/reboot time, as suggested by Perry Metzger.
 1.19  15-Jan-1996  thorpej Three distinct changes:
- Better disklabel handling. While a disklabel isn't used
in the driver, some versions of the OpenPROM insist on
one being present in order to boot from floppy. These
changes provide a default label (in a way similar to how
the SCSI disk driver provides a default) so that a user
can more easily place the label on the disk.

- Fix semi-bug in bootpath handling. It appears as if the
bootpath can appear in a couple of formats: "/fd@0,0", which
is what bootpath_fake() creates on v0 proms and may be
passed by some v2 proms, and "/fd0" which is what the
v2 prom on my SS2 passes. We now handle both formats.

- Use a mountroot hook to eject the floppy and wait for
the user to insert a filesystem floppy if we're the boot/root
device.
 1.18  12-Jan-1996  thorpej Balance calls to disk_busy() and disk_unbusy() properly to avoid
dk_busy < 0 panics. Count seeks.
 1.17  11-Jan-1996  pk Return `no error' after ejecting; per Jason.
 1.16  07-Jan-1996  thorpej New generic disk framework. Highlights:

- New metrics handling. Metrics are now kept in the new
`struct disk'. Busy time is now stored as a timeval, and
transfer count in bytes.

- Storage for disklabels is now dynamically allocated, so that
the size of the disk structure is not machine-dependent.

- Several new functions for attaching and detaching disks, and
handling metrics calculation.

Old-style instrumentation is still supported in drivers that did it before.
However, old-style instrumentation is being deprecated, and will go away
once the userland utilities are updated for the new framework.

For usage and architectural details, see the forthcoming disk(9) manual
page.
 1.15  11-Dec-1995  pk Adapt to changed mapiodev() interface.
 1.14  11-Nov-1995  pk dk_device => device in controller structure (noted by Jason Thorpe).
 1.13  09-Oct-1995  pk Point `bootdv' at the disk device instead of the controller (from Jason Thorpe).
 1.12  03-Oct-1995  pk Bring reset logic into interrupt state machine.
 1.11  02-Oct-1995  pk Fix some bogus calls to {read/write}disklabel().
 1.10  18-Aug-1995  pk Set `bootdv' if booted from the floppy drive.
 1.9  05-Jul-1995  pk Add xxread/xxwrite.
 1.8  20-May-1995  pk Use a different method to discriminate a 82077 from a 82072 (from Chris Torek);
using the NE7CMD_VERSION command is too unreliable.
 1.7  16-May-1995  pk Really test # of status bytes.
 1.6  25-Apr-1995  pk Do not report each pseudo-DMA overrun as a (soft) error.
Add a small heuristic to converge on an acceptable threshold value.
 1.5  13-Apr-1995  pk Do a probe in fdmatch() to guard against dumb PROMs.
 1.4  10-Apr-1995  mycroft Fdclose --> fdclose
 1.3  07-Apr-1995  pk Add evcnt_attach().
 1.2  22-Feb-1995  pk Reorganize to use fast interrupt handler.
 1.1  17-Feb-1995  pk Pilot sun4c floppy driver based on i386 version;
- same limitations as isa/fd.c: just read/write
- in need of a fast interrupt handler
 1.33.4.1  12-Jun-1996  pk Pull down from trunk:
>rev 1.34: Fix case where sequence state wasn't updated properly ...
 1.46.2.1  14-Jan-1997  thorpej Snapshot of work-in-progress, committed to private branch.

These changes implement machine-independent root device and file system
selection. Notable features:

- All ports behave in a consistent manner regarding root
device selection.
- No more "options GENERIC"; all kernels have the ability
to boot with RB_ASKNAME to select root device and file system
type.
- Root file system type can be wildcarded; a machine-independent
function will try all possible file systems for the selected
root device until one succeeds.
- If the root file system fails to mount, the operator will
be given the chance to select a new root device and file
system type, rather than having the machine simply panic.
- nfs_mountroot() no longer panics if any part of the NFS
mount process fails; it now returns an error, giving the
operator a chance to recover.
- New, more consistent, config(8) grammar. The constructs:

config netbsd swap generic
config netbsd root on nfs

have been replaced with:

config netbsd root on ? type ?
config netbsd root on ? type nfs

Additionally, the operator may select or wildcard root file
system type in the kernel configuration file:

config netbsd root on cd0a type cd9660

config(8) now requires that a "root" specification be
made. "root" may be wired down or wildcarded. "swap" and
"dump" specifications are optional, and follow previous
semantics.

- config(8) has a new "file-system" keyword, used to configure
file systems into the kernel. Eventually, this will be used
to generate the default vfssw[].

- "options NFSCLIENT" is obsolete, and is replaced by
"file-system NFS". "options NFSSERVER" still exists, since
NFS server support is independent of the NFS file system
client.

- sys/arch/<foo>/<foo>/swapgeneric.c is no longer used, and
will be removed; all information is now generated by config(8).

As of this commit, all ports except arm32 have been updated to use
the new setroot(). Only SPARC, i386, and Alpha ports have been
tested at this time. Port masters should test these changes on their
ports, and report any problems back to me.

More changes are on their way, including RB_ASKNAME support in
nfs_mountroot() (to prompt for server address and path) and, potentially,
the ability to select rarp/bootparam or bootp in nfs_mountroot().
 1.67.14.2  27-Dec-1999  wrstuden Pull up to last week's -current.
 1.67.14.1  21-Dec-1999  wrstuden Initial commit of recent changes to make DEV_BSIZE go away.

Runs on i386, needs work on other arch's. Main kernel routines should be
fine, but a number of the stand programs need help.

cd, fd, ccd, wd, and sd have been updated. sd has been tested with non-512
byte block devices. vnd, raidframe, and lfs need work.

Non 2**n block support is automatic for LKM's and conditional for kernels
on "options NON_PO2_BLOCKS".
 1.67.8.2  23-Apr-2001  bouyer Sync with HEAD.
 1.67.8.1  20-Nov-2000  bouyer Update thorpej_scsipi to -current as of a month ago
A i386 GENERIC kernel compiles without the siop, ahc and bha drivers
(will be updated later). i386 IDE/ATAPI and ncr work, as well as
sparc/esp_sbus. alpha should work as well (untested yet).
siop, ahc and bha will be updated once I've updated the branch to current
-current, as well as machine-dependant code.
 1.67.2.1  07-Feb-2000  he Apply patch (requested by pk):
Fix several problems:
o Floppy driver dislikes being accessed with no floppy inserted
(PR#5740)
o Floppy drive being detected even though there is none (PR#5760)
o Panic when fdformat is used (PR#9251)
 1.81.2.1  22-Jun-2000  minoura Sync w/ netbsd-1-5-base.
 1.82.2.1  19-Jul-2000  mrg pull up sparc/sparc64 bus_intr_establish() changes, necessary for sparc64
(originally done by pk, approved by thorpej):

>Add a `device class' interrupt level argument (from machine/intr.h)
>to bus_interrupt_establish().
>
>It's currently only used in sparc64/dev/psycho.c to assign a CPU interrupt
>level to devices in PCI slots.
 1.85.2.1  21-Jun-2001  nathanw Catch up to -current.
 1.87.4.2  10-Oct-2001  fvdl Convert all remaining devices.
 1.87.4.1  01-Oct-2001  fvdl Catch up with -current.
 1.87.2.4  10-Oct-2002  jdolecek sync kqueue with -current; this includes merge of gehenna-devsw branch,
merge of i386 MP branch, and part of autoconf rototil work
 1.87.2.3  06-Sep-2002  jdolecek sync kqueue branch with HEAD
 1.87.2.2  16-Mar-2002  jdolecek Catch up with -current.
 1.87.2.1  10-Jan-2002  thorpej Sync kqueue branch with -current.
 1.88.4.8  03-Jan-2003  thorpej Sync with HEAD.

XXX ALT_SWITCH_CODE is not yet LWP'ified.
 1.88.4.7  11-Dec-2002  thorpej Sync with HEAD.
 1.88.4.6  11-Nov-2002  nathanw Catch up to -current
 1.88.4.5  18-Oct-2002  nathanw Catch up to -current.
 1.88.4.4  17-Sep-2002  nathanw Catch up to -current.
 1.88.4.3  13-Aug-2002  nathanw Catch up to -current.
 1.88.4.2  01-Apr-2002  nathanw Catch up to -current.
(CVS: It's not just a program. It's an adventure!)
 1.88.4.1  26-Sep-2001  nathanw file fd.c was added on branch nathanw_sa on 2002-04-01 07:42:41 +0000
 1.89.4.2  31-Aug-2002  gehenna catch up with -current.
 1.89.4.1  17-May-2002  gehenna Add device switch.
 1.109.2.8  11-Dec-2005  christos Sync with head.
 1.109.2.7  10-Nov-2005  skrll Sync with HEAD. Here we go again...
 1.109.2.6  04-Feb-2005  skrll Adapt to branch.
 1.109.2.5  02-Nov-2004  skrll Sync with HEAD.
 1.109.2.4  24-Sep-2004  skrll Sync with HEAD.
 1.109.2.3  21-Sep-2004  skrll Fix the sync with head I botched.
 1.109.2.2  18-Sep-2004  skrll Sync with HEAD.
 1.109.2.1  03-Aug-2004  skrll Sync with HEAD
 1.117.2.6  21-Jan-2008  yamt sync with head
 1.117.2.5  07-Dec-2007  yamt sync with head
 1.117.2.4  27-Oct-2007  yamt sync with head.
 1.117.2.3  03-Sep-2007  yamt sync with head.
 1.117.2.2  26-Feb-2007  yamt sync with head.
 1.117.2.1  21-Jun-2006  yamt sync with head.
 1.118.2.1  02-Nov-2005  yamt sync with head.
 1.119.2.1  22-Nov-2005  yamt sync with head.
 1.121.2.2  01-Mar-2006  yamt sync with head.
 1.121.2.1  15-Jan-2006  yamt sync with head.
 1.124.4.1  22-Apr-2006  simonb Sync with head.
 1.124.2.1  09-Sep-2006  rpaulo sync with head
 1.125.6.1  24-May-2006  tron Merge 2006-05-24 NetBSD-current into the "peter-altq" branch.
 1.125.4.1  19-Apr-2006  elad sync with head - hopefully this will work
 1.125.2.1  24-May-2006  yamt sync with head.
 1.127.2.2  17-May-2007  yamt sync with head.
 1.127.2.1  12-Mar-2007  rmind Sync with HEAD.
 1.130.10.3  16-Oct-2007  garbled Sync with HEAD
 1.130.10.2  03-Oct-2007  garbled Sync with HEAD
 1.130.10.1  22-May-2007  matt Update to HEAD.
 1.130.4.1  11-Jul-2007  mjf Sync with head.
 1.130.2.5  03-Dec-2007  ad Sync with HEAD.
 1.130.2.4  20-Aug-2007  ad - Alter disk attach/detach to fix a panic when closing a vnd device.
- Sync with HEAD.
 1.130.2.3  19-Aug-2007  ad - Back out the biodone() changes.
- Eliminate B_ERROR (from HEAD).
 1.130.2.2  01-Jul-2007  ad Adapt to callout API change.
 1.130.2.1  27-May-2007  ad Sync with head.
 1.134.4.1  15-Aug-2007  skrll Sync with HEAD.
 1.134.2.1  07-Aug-2007  matt Sync with HEAD.
 1.135.8.1  14-Oct-2007  yamt sync with head.
 1.135.6.2  09-Jan-2008  matt sync with HEAD
 1.135.6.1  06-Nov-2007  matt sync with HEAD
 1.135.4.2  03-Dec-2007  joerg Sync with HEAD.
 1.135.4.1  26-Oct-2007  joerg Sync with HEAD.

Follow the merge of pmap.c on i386 and amd64 and move
pmap_init_tmp_pgtbl into arch/x86/x86/pmap.c. Modify the ACPI wakeup
code to restore CR4 before jumping back into kernel space as the large
page option might cover that.
 1.137.2.2  18-Feb-2008  mjf Sync with HEAD.
 1.137.2.1  08-Dec-2007  mjf Sync with HEAD.
 1.138.6.1  02-Jan-2008  bouyer Sync with HEAD
 1.138.2.1  31-Dec-2007  ad Catch up with buffer cache changes.
 1.139.10.4  11-Mar-2010  yamt sync with head
 1.139.10.3  20-Jun-2009  yamt sync with head
 1.139.10.2  04-May-2009  yamt sync with head.
 1.139.10.1  16-May-2008  yamt sync with head.
 1.139.8.2  17-Jun-2008  yamt sync with head.
 1.139.8.1  18-May-2008  yamt sync with head.
 1.139.6.3  17-Jan-2009  mjf Sync with HEAD.
 1.139.6.2  29-Jun-2008  mjf Sync with HEAD.
 1.139.6.1  02-Jun-2008  mjf Sync with HEAD.
 1.140.4.1  18-Jun-2008  simonb Sync with head.
 1.140.2.1  23-Jun-2008  wrstuden Sync w/ -current. 34 merge conflicts to follow.
 1.141.12.1  21-Apr-2010  matt sync to netbsd-5
 1.141.6.1  23-Jan-2010  bouyer Pull up following revision(s) (requested by tsutsui in ticket #1251):
sys/arch/sparc/sparc/auxreg.h: revision 1.13
distrib/sparc/ramdisk/dot.profile: revision 1.20
sys/arch/sparc/dev/audioamd.c: revision 1.25
sys/arch/sparc/dev/fd.c: revision 1.147
sys/arch/sparc/stand/common/promdev.c: revision 1.23
distrib/sparc/miniroot/Makefile.inc: revision 1.16
Build miniroot binaries for sparc with -Os to shrink instfs.tgz
for the second boot floppy which use miniroot objects.
This is workaround for PR install/42146, and ok'ed by mrg@.
Don't try to read disklabel to check FS_RAID on floppy boot since
reopening floppy could cause Data Access Exception later.
Fixes PR port-sparc/42186, ok'ed by mrg@.
Disable "fast trap" handlers which invoke software interrupts
in sparc/amd7930intr.s and sparc/bsd_fdintr.s until they are
rewritten to adapt new MI softint(9) API.
No particular comments on PR port-sparc/42192, but
this fixes timeout problem on floppy access on my SPARCstation 1+.
XXX: floppy support on sun4m seems to have another problem (data overrun).
Use /dev/fd0a rather than /dev/rfd0a to read instfs.tgz image from floppy.
It looks newer (appearred after 1.6) gzip tries to read less than DEV_BSIZE
(to check header?) so we can't use raw device directly.
(note sparc bootfs ramdisk doesn't have dd(1))
Workaround for PR port-sparc/42193, and would also fix PR install/28734.
Explicitly clear AUXIO4M_FTC bit in FTC_FLIP macro used on
pseudo-dma for floppy, as well as AUXIO4C_FTC bit for sun4c.
A comment in the macro says AUXIO4M_FTC bit is auto-clear,
but my two SS20s (including compatible) with 150MHz hyperSPARCs
get data_overrun without it, and no bad side effect on SS5
(works with and without this change).
Closes PR port-sparc/42516, which is the last one of a bunch of
floppy issue on NetBSD/sparc since NetBSD 2.0 days. See
http://mail-index.NetBSD.org/port-sparc/2009/12/20/msg000484.html
for details.
 1.141.4.2  28-Apr-2009  skrll Sync with HEAD.
 1.141.4.1  19-Jan-2009  skrll Sync with HEAD.
 1.144.2.1  13-May-2009  jym Sync with HEAD.

Commit is split, to avoid a "too many arguments" protocol error.
 1.148.2.1  30-Apr-2010  uebayasi Sync with HEAD.
 1.150.14.1  03-Nov-2014  msaitoh Pull up following revision(s) (requested by tsutsui in ticket #1139):
sys/arch/sun3/dev/fd.c: revision 1.78
sys/arch/sparc/dev/fd.c: revision 1.155
sys/arch/sparc64/dev/fdc.c: revision 1.42
Fix panic() on opening fd(4), caused by a wrong pointer passed to memset().
I'm not sure why this 18 year old bug didn't cause problem before
(at least my old 5.99.23 kernel worked), but probably it's triggered
by new gcc 4.8 which might do more aggressive memory allocation.
The problem is found by Nobuyoshi Sato on trying eject(1) against fd(4).
Should be pulled up to netbsd-7.
Sync with sparc/dev/fd.c:1.155.
Fix panic() on opening fd(4), caused by a wrong pointer passed to memset().
I'm not sure why this 18 year old bug didn't cause problem before
(at least my old 5.99.23 kernel worked), but probably it's triggered
by new gcc 4.8 which might do more aggressive memory allocation.
The problem is found by Nobuyoshi Sato on trying eject(1) against fd(4).
Should be pulled up to netbsd-7.
Sync with sparc/dev/fd.c rev 1.155.
Fix panic() on opening fd(4), caused by a wrong pointer passed to memset().
Note sun3 still uses gcc 4.5.4 but also panicked by this old bug,
so probably this problem was triggered by not gcc 4.8 but struct disk
changes (struct disk_geom was added in <sys/disk.h> rev 1.58),
which increased sizeof(struct fd_softc) from 248 bytes to 296 bytes.
(i.e. now struct fd_softc could be allocated in a different pool block,
probably near the wrong pointer of the struct disklabel)
Anyway, this fix should be pullued up to netbsd-7.
(probably I'm the only user of floppy on sun3 though)
 1.150.12.3  03-Dec-2017  jdolecek update from HEAD
 1.150.12.2  20-Aug-2014  tls Rebase to HEAD as of a few days ago.
 1.150.12.1  20-Nov-2012  tls Resync to 2012-11-19 00:00:00 UTC
 1.150.8.2  03-Nov-2014  msaitoh Pull up following revision(s) (requested by tsutsui in ticket #1139):
sys/arch/sun3/dev/fd.c: revision 1.78
sys/arch/sparc/dev/fd.c: revision 1.155
sys/arch/sparc64/dev/fdc.c: revision 1.42
Fix panic() on opening fd(4), caused by a wrong pointer passed to memset().
I'm not sure why this 18 year old bug didn't cause problem before
(at least my old 5.99.23 kernel worked), but probably it's triggered
by new gcc 4.8 which might do more aggressive memory allocation.
The problem is found by Nobuyoshi Sato on trying eject(1) against fd(4).
Should be pulled up to netbsd-7.
Sync with sparc/dev/fd.c:1.155.
Fix panic() on opening fd(4), caused by a wrong pointer passed to memset().
I'm not sure why this 18 year old bug didn't cause problem before
(at least my old 5.99.23 kernel worked), but probably it's triggered
by new gcc 4.8 which might do more aggressive memory allocation.
The problem is found by Nobuyoshi Sato on trying eject(1) against fd(4).
Should be pulled up to netbsd-7.
Sync with sparc/dev/fd.c rev 1.155.
Fix panic() on opening fd(4), caused by a wrong pointer passed to memset().
Note sun3 still uses gcc 4.5.4 but also panicked by this old bug,
so probably this problem was triggered by not gcc 4.8 but struct disk
changes (struct disk_geom was added in <sys/disk.h> rev 1.58),
which increased sizeof(struct fd_softc) from 248 bytes to 296 bytes.
(i.e. now struct fd_softc could be allocated in a different pool block,
probably near the wrong pointer of the struct disklabel)
Anyway, this fix should be pullued up to netbsd-7.
(probably I'm the only user of floppy on sun3 though)
 1.150.8.1  17-Oct-2012  riz branches: 1.150.8.1.2;
Pull up following revision(s) (requested by tsutsui in ticket #602):
sys/arch/sparc/dev/fd.c: revision 1.151
sys/arch/sparc/sparc/memecc.c: revision 1.15
Fix device_t/softc split botches that could be fatal. From
Chuck Silvers' patch posted current-users and tech-kern:
http://mail-index.netbsd.org/current-users/2012/10/09/msg021233.html
Should be pulled up to netbsd-6.
 1.150.8.1.2.1  03-Nov-2014  msaitoh Pull up following revision(s) (requested by tsutsui in ticket #1139):
sys/arch/sun3/dev/fd.c: revision 1.78
sys/arch/sparc/dev/fd.c: revision 1.155
sys/arch/sparc64/dev/fdc.c: revision 1.42
Fix panic() on opening fd(4), caused by a wrong pointer passed to memset().
I'm not sure why this 18 year old bug didn't cause problem before
(at least my old 5.99.23 kernel worked), but probably it's triggered
by new gcc 4.8 which might do more aggressive memory allocation.
The problem is found by Nobuyoshi Sato on trying eject(1) against fd(4).
Should be pulled up to netbsd-7.
Sync with sparc/dev/fd.c:1.155.
Fix panic() on opening fd(4), caused by a wrong pointer passed to memset().
I'm not sure why this 18 year old bug didn't cause problem before
(at least my old 5.99.23 kernel worked), but probably it's triggered
by new gcc 4.8 which might do more aggressive memory allocation.
The problem is found by Nobuyoshi Sato on trying eject(1) against fd(4).
Should be pulled up to netbsd-7.
Sync with sparc/dev/fd.c rev 1.155.
Fix panic() on opening fd(4), caused by a wrong pointer passed to memset().
Note sun3 still uses gcc 4.5.4 but also panicked by this old bug,
so probably this problem was triggered by not gcc 4.8 but struct disk
changes (struct disk_geom was added in <sys/disk.h> rev 1.58),
which increased sizeof(struct fd_softc) from 248 bytes to 296 bytes.
(i.e. now struct fd_softc could be allocated in a different pool block,
probably near the wrong pointer of the struct disklabel)
Anyway, this fix should be pullued up to netbsd-7.
(probably I'm the only user of floppy on sun3 though)
 1.150.2.2  22-May-2014  yamt sync with head.

for a reference, the tree before this commit was tagged
as yamt-pagecache-tag8.

this commit was splitted into small chunks to avoid
a limitation of cvs. ("Protocol error: too many arguments")
 1.150.2.1  30-Oct-2012  yamt sync with head
 1.151.2.1  18-May-2014  rmind sync with head
 1.152.2.1  10-Aug-2014  tls Rebase.
 1.154.2.1  24-Aug-2014  martin Pull up following revision(s) (requested by tsutsui in ticket #53):
sys/arch/sun3/dev/fd.c: revision 1.78
sys/arch/sparc/dev/fd.c: revision 1.155
sys/arch/sparc64/dev/fdc.c: revision 1.42
Fix panic() on opening fd(4), caused by a wrong pointer passed to memset().
 1.155.2.2  06-Jun-2015  skrll Sync with HEAD
 1.155.2.1  06-Apr-2015  skrll Sync with HEAD
 1.157.18.2  13-Apr-2020  martin Mostly merge changes from HEAD upto 20200411
 1.157.18.1  10-Jun-2019  christos Sync with HEAD
 1.157.16.1  06-Sep-2018  pgoyette Sync with HEAD

Resolve a couple of conflicts (result of the uimin/uimax changes)
 1.160.8.1  14-Dec-2020  thorpej Sync w/ HEAD.
 1.161.2.1  21-Mar-2021  thorpej Give config_found() the same variadic arguments treatment as
config_search(). This commit only adds the CFARG_EOL sentinel
to the existing config_found() calls. Conversion of config_found_sm_loc()
and config_found_ia() call sites will be in subsequent commits.
 1.162.8.1  04-Aug-2021  thorpej Adapt to CFARGS().

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