No longer needed; we use the MI IDE driver now.

Adjust for config changes.

branches: 1.9.2;
Implement DIOCGDEFLABEL.

branches: 1.8.2;
sync with dev/isa/wd.c rev. 1.162:
>date: 1997/07/18 00:26:22; author: fvdl; state: Exp; lines: +10 -10
>Work around possible race condition with 2 drives on one controller
>in wd_get_parms. PR 3773, from Onno van der Linden (onno@simplex.nl)
S: ----------------------------------------------------------------------

use locator defines in "locators.h" to index cf_loc[]

foosize()'s return value is in DEV_BSIZE units; adjust the size obtained
from the disklabel accordingly.

Remove spurious line left over in previous commit.
Also, use parentheses like in <dev/isa/wd.c>

wdsize(): only call wdopen()/wdclose() if not already open, per the
current `openmask'.

branches: 1.3.2;
minimal changes to make hacked wd driver work under a different name.
It is configured (in config files) as 'awdc'/'awd', but shows up as
'wdc'/'wd', so that a minimal amount of code had to be modified to make
the name change work. This is only intended to be temporary, anyway.

Convert to use bus_space_* macros. The resulting code isn't quite correct,
but works on the alpha (since there's currently no floppy drive support).

copy ISA wd driver from /sys/dev/isa/wd.c. This rev is unmodified.
This is temporary, until /sys/dev/isa/wd.c is properly bus_space_*-ified.

Use dev/isa/fd.c.

Fallout from callout.

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.

Add a new function call to the ISA DMA API: isa_dmamaxsize(), which returns
the maximum transfer size for the specified DMA channel. Make all clients
of ISA DMA use this call to determine their maximum transfer size.

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.

Update for sys/buf.h/disksort_*() changes.

branches: 1.5.8; 1.5.14;
completely remove Mach VM support. all that is left is the all the
header files as UVM still uses (most of) these.

Update to slightly altered rnd_attach_source() api

Use DMAMODE_DEMAND. Tested on an AS200.

Kill vestiges of isa_establish().

Floppy driver for NetBSD/alpha, copied from i386 port, and munged to take
out the i386'isms (i.e. no NVRAM read for default floppy type; floppies
just default to 1.44MB).

Use dev/isa/fd.c.

Add a new function call to the ISA DMA API: isa_dmamaxsize(), which returns
the maximum transfer size for the specified DMA channel. Make all clients
of ISA DMA use this call to determine their maximum transfer size.

branches: 1.1.8;
Floppy driver for NetBSD/alpha, copied from i386 port, and munged to take
out the i386'isms (i.e. no NVRAM read for default floppy type; floppies
just default to 1.44MB).

wholesale update from my NetBSD/Alpha source tree. Includes:
Support for AXPpci CPUs,
Support for AlphaStation 600 CPUs,
new boot block structure, which requires an 'installboot'
program and works a lot like the NetBSD/sparc boot blocks.

ISA and PCI support for DEC AlphaStations

wholesale update from my NetBSD/Alpha source tree. Includes:
Support for AXPpci CPUs,
Support for AlphaStation 600 CPUs,
new boot block structure, which requires an 'installboot'
program and works a lot like the NetBSD/sparc boot blocks.

ISA and PCI support for DEC AlphaStations

Liberally sprinkle static around to get more symbols out of the
global namespace. A small bit of const poisoning in the TC code.

branches: 1.21.64;
Do a minor cleanup of alpha (this will make applying pullups post branching
easier).
u_int{8,16,32,64}_t -> uint{*}_t
Change all old-style definitions to C89 prototypes.
Whitespace cleanup.
Constification in db_disasm.c

branches: 1.20.2; 1.20.6;
CFATTACH_DECL(..., sizeof(struct device), -> CFATTACH_DECL_NEW(..., 0
struct device * -> device_t
struct cfdata * -> cfdata_t

branches: 1.19.6;
rework <uvm/uvm_extern.h> includes.

branches: 1.18.4;
ANSIfy another 1261 function definitions.
The only ones left in sys are beyond by sed script!
(or in sys/dist or sys/external)
Mostly they have function pointer parameters.

Change about 4500 of the K&R function definitions to ANSI ones.
There are still about 1600 left, but they have ',' or /* ... */
in the actual variable definitions - which my awk script doesn't handle.
There are also many that need () -> (void).
(The script does handle misordered arguments.)

Remove all the __P() from sys (excluding sys/dist)
Diff checked with grep and MK1 eyeball.
i386 and amd64 GENERIC and sys still build.

branches: 1.15.112; 1.15.120; 1.15.126;
Use CFATTACH_DECL().

Declare all cfattach structures const.

branches: 1.13.2; 1.13.4;
remove include of <vm/vm.h>. <vm/vm.h> -> <uvm/uvm_extern.h>

branches: 1.12.12;
implemt a simple "beep" device to access the ISA speaker

pull in new PC display headers

Adapt ISA console selection ti new mi drivers.
(was broken anyway, a "++" was missing somewhere)

Nuke the idea of <machine/options.h>. It completely defeats the purpose
of fine-grain option dependencies.

branches: 1.8.4;
by default, provide RCS IDs for NetBSD/alpha kernel files in kernel binaries.
This can be disabled (to save a bit of space) with the NO_KERNEL_RCSIDS
options, which is present but commented out in the ALPHA config file.
In ELF-format kernels, these strings are present in the kernel binary but
are not loaded into memory. (In ECOFF-format kernels, there's no easy way
to keep them from being loaded, so they _are_ loaded into memory.)

clean up NetBSD RCS ID strings, include machine/options.h

fix bogon in comment (s/PCI/ISA/)

branches: 1.5.2;
update for new names for ISA VGA console match and attach functions

implement isa_display_console(), to be used when console is an ISA display dev

wholesale update from my NetBSD/Alpha source tree. Includes:
Support for AXPpci CPUs,
Support for AlphaStation 600 CPUs,
new boot block structure, which requires an 'installboot'
program and works a lot like the NetBSD/sparc boot blocks.

oops; trim some bogus 1994's from copyrights

ISA and PCI support for DEC AlphaStations

move isa/isa_machdep.h to include/isa_machdep.h. (can't do it via
repository copy because alpha already had an include/isa_machdep.h in
the attic.)

implemt a simple "beep" device to access the ISA speaker

Add isa_dma{freeze,thaw}(), used to temporarily stop and then restart
all ISA DMA. Needed by e.g. the SmartCard reader for Sharks.

Change the ISA DMA API to take an isa_chipset_tag_t rather than
a struct device * corresponding to the ISA bus device. The ISA DMA
controller driver functions have been renamed and now take a struct
isa_dma_state *, and are called indirectly by machine-dependent code
which provides the DMA state.

These changes allow e.g. `ofisa' (the OpenFirmware configuration
mechanism for the ISA bus, used by e.g. Sharks) to use the MI ISA
DMA controller code.

Add isa_intr_alloc macro (for PCMCIA).

Adapt ISA console selection ti new mi drivers.
(was broken anyway, a "++" was missing somewhere)

clean up NetBSD RCS ID strings

branches: 1.3.2;
add an isa_display_console() function, to be used when console is an ISA dev

define all of the appropriate functions, as indirections through
a function switch.

(incomplete) machine-dependent ISA definitions.

Ensure bus_dmatag_subregion is called with an inclusive max_addr
everywhere.

Correct copypaste comment grammar.

Liberally sprinkle static around to get more symbols out of the
global namespace. A small bit of const poisoning in the TC code.

branches: 1.14.4;
malloc(9) -> kmem(9)

branches: 1.13.30;
PR/50854: David Binderman: Remove redundant code.

branches: 1.12.6; 1.12.24;
Do a minor cleanup of alpha (this will make applying pullups post branching
easier).
u_int{8,16,32,64}_t -> uint{*}_t
Change all old-style definitions to C89 prototypes.
Whitespace cleanup.
Constification in db_disasm.c

branches: 1.11.2; 1.11.6;
#include <sys/bus.h> instead of <machine/bus.h>.

rework <uvm/uvm_extern.h> includes.

branches: 1.9.4;
Remove all the __P() from sys (excluding sys/dist)
Diff checked with grep and MK1 eyeball.
i386 and amd64 GENERIC and sys still build.

branches: 1.8.8; 1.8.14;
Remove clause 3 and 4 from TNF licenses

branches: 1.7.40; 1.7.42; 1.7.44;
fix fallout from caddr_t changes.

Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

branches: 1.5.18; 1.5.56;
Move definition of ISA_DMA_BOUNCE_THRESHOLD to dev/isa/isareg.h.

Keep track of which DMA window was actually used to map the
request (not always the passed in DMA tag if we try direct-map
and then fall back to sgmap-mapped). Use the actual window
when performing dmamap_sync and dmamap_unload operations.

Fixes DMA resource leak on systems with 2G+ RAM. Thanks to
Matt Thomas for help debugging this.

branches: 1.3.2; 1.3.4; 1.3.6;
remove include of <vm/vm.h>. <vm/vm.h> -> <uvm/uvm_extern.h>

branches: 1.2.2; 1.2.4;
Forgot __KERNEL_RCSID().

ISA DMA bounce buffer code, needed for a couple of SGMAP-less
systems, support for which will be hitting the tree soon.

This file is obsolsete.

branches: 1.7.18; 1.7.28;
Nuke the idea of <machine/options.h>. It completely defeats the purpose
of fine-grain option dependencies.

branches: 1.6.4;
by default, provide RCS IDs for NetBSD/alpha kernel files in kernel binaries.
This can be disabled (to save a bit of space) with the NO_KERNEL_RCSIDS
options, which is present but commented out in the ALPHA config file.
In ELF-format kernels, these strings are present in the kernel binary but
are not loaded into memory. (In ECOFF-format kernels, there's no easy way
to keep them from being loaded, so they _are_ loaded into memory.)

clean up NetBSD RCS ID strings, include machine/options.h

branches: 1.4.2;
backout previous kprintf change

printf -> kprintf, sprintf -> ksprintf

add CMU copyright notice

ISA and PCI support for DEC AlphaStations

Remove unnecessary #include <sys/malloc.h>

branches: 1.8.70;
#include <sys/bus.h> instead of <machine/bus.h>.

Change about 4500 of the K&R function definitions to ANSI ones.
There are still about 1600 left, but they have ',' or /* ... */
in the actual variable definitions - which my awk script doesn't handle.
There are also many that need () -> (void).
(The script does handle misordered arguments.)

branches: 1.6.8; 1.6.14;
Remove clause 3 and 4 from TNF licenses

branches: 1.5.74; 1.5.76; 1.5.78;
merge ktrace-lwp.

add __KERNEL_RCSID() (using 1, for #included .c files)

branches: 1.3.46;
Assign copyright to TNF.

Merge paddr_t changes into the main branch.

branches: 1.1.2;
Machine-dependent ISA PnP goo for NetBSD/alpha.

Moved to arch/alpha/include/isapnp_machdep.h,v

Assign copyright to TNF.

Merge paddr_t changes into the main branch.

branches: 1.1.2;
Machine-dependent ISA PnP goo for NetBSD/alpha.

Wrap the mcclock driver's mc146818_softc inside a new mcclock_softc.
This commit represents no functional change, but forms the basis for
a future functional change.

Liberally sprinkle static around to get more symbols out of the
global namespace. A small bit of const poisoning in the TC code.

branches: 1.20.70;
#include <sys/bus.h> instead of <machine/bus.h>.

Don't forget to initialize sc_dev.

Split device_t and softc for MI mc146818 clock,
and other related misc cosmetics.

branches: 1.17.16;
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.

branches: 1.16.6;
Add MI todr(9) support and timercounter(9) support with kern_cctr.c to alpha:
- use todr(9) API with MI mc146818(4) driver and remove homegrown
todr stuff from MD alpha/clock.c and alpha/mcclock.c
- also remove obsolete cc_microtime stuff from MD code
- add ci_pcc_freq member in struct cpu_info for cpu_frequency(), and
calibrate it with mc146818 interval clock in mcclock attachment
- call cc_init() in cpu_initclocks(9) because all alpha cpus have
a pcc counter

Tested on DEC 3000/300 and AlphaPC 164, but not on any SMP machines yet.

branches: 1.15.30; 1.15.38; 1.15.42; 1.15.44;
merge ktrace-lwp.

branches: 1.14.12;
adapt to ISA "unknown address" namespace separation

branches: 1.13.6;
Use CFATTACH_DECL().

Declare all cfattach structures const.

Overhaul of the ISA autoconfiguration code to support direct
configuration of devices logically attached to the ISA bus:

* Change the isa_attach_args to have arrays of io, mem, irq, drq
resources.
* Add a "pnpnames" and a linked list of "pnpcompatnames" to the
isa_attach_args. If either of these members are non-NULL,
direct configuration of the bus is being performed. Add an
ISA_DIRECT_CONFIG() macro to test for this.
* Drivers are not allowed to modify the isa_attach_args unless
direct configuration is not being performed and the probe fucntion
is returning success.
* Adapt device drivers -- currently, all driver probe routines return
"no match" if ISA_DIRECT_CONFIG() evaluates to true.

branches: 1.10.30; 1.10.32;
Nuke the idea of <machine/options.h>. It completely defeats the purpose
of fine-grain option dependencies.

branches: 1.9.2;
Use new <dev/dec/clockvar.h> and and <dev/dec/mcclokvar.h>.
Garbage-collect original headers from sys/arch/alpha.

by default, provide RCS IDs for NetBSD/alpha kernel files in kernel binaries.
This can be disabled (to save a bit of space) with the NO_KERNEL_RCSIDS
options, which is present but commented out in the ALPHA config file.
In ELF-format kernels, these strings are present in the kernel binary but
are not loaded into memory. (In ECOFF-format kernels, there's no easy way
to keep them from being loaded, so they _are_ loaded into memory.)

clean up NetBSD RCS ID strings, include machine/options.h

remove all traces of __BROKEN_INDIRECT_CONFIG (except in shared drivers)

update these so they compile whether or not __BROKEN_INDIRECT_CONFIG
is defined.

branches: 1.4.2;
clean up match: check args more carefully, make sure I/O space can be mapped

update for new bus.h macros. bus_io_* and bus_mem_* integrated into
single bus_space_* framework. Unfortunately, bus_space_{read,write}_*
operations still imply barriers. That will change soon.

fix copyrights

clean up clock handling: clock drivers are now seperate from the
chip-independent clock code. 'clock' has been renamed 'mcclock' 'clock'
has been renamed 'mcclock' (since it's a driver for that particular
clock, and since eventually there may be another clock chip driver),
and now attaches via seperate match/attach functions to both TC and ISA.
This removes a whole lot of #ifdefs...

Drivers for PC-like console devices are MI now.

Don't use the ISA `delay port', since it no longer exists.

adapt to changed <dev/ic/i8042reg.h>

Adjust for config changes.

Enter DDB on cntl-alt-esc (a'la i386).

Nuke the idea of <machine/options.h>. It completely defeats the purpose
of fine-grain option dependencies.

branches: 1.18.4;
by default, provide RCS IDs for NetBSD/alpha kernel files in kernel binaries.
This can be disabled (to save a bit of space) with the NO_KERNEL_RCSIDS
options, which is present but commented out in the ALPHA config file.
In ELF-format kernels, these strings are present in the kernel binary but
are not loaded into memory. (In ECOFF-format kernels, there's no easy way
to keep them from being loaded, so they _are_ loaded into memory.)

use machine/conf.h instead of sys/conf.h and/or machine/cpuconf.h

clean up NetBSD RCS ID strings, include machine/options.h

remove all traces of __BROKEN_INDIRECT_CONFIG (except in shared drivers)

update these so they compile whether or not __BROKEN_INDIRECT_CONFIG
is defined.

branches: 1.13.2;
Add a primitive driver for the PC-ish Programmable Peripheral Interface
and PC-ish keyboard controller. (Actually, on alphas, the built-in PPI
(in the SIO) appears to be a lobotomized version of the original, but
i'd not call that a bad thing.) This driver should eventually handle all
speaker tone requests and keyboard commands, but for now it just maps
the relevant ports and passes them on to the keyboard and mouse drivers,
which are now its children (rather than children of ISA).

catch up with wscons frame buffer attachment, mmap, and ioctl
interface changes.

compile cleanly with:
-Werror -Wall -Wstrict-prototypes -Wmissing-prototypes -Wcast-qual

update for new bus.h macros. bus_io_* and bus_mem_* integrated into
single bus_space_* framework. Unfortunately, bus_space_{read,write}_*
operations still imply barriers. That will change soon.

backout previous kprintf change

printf -> kprintf, sprintf -> ksprintf

Don't attempt to map the `delay port' (0x84). It's mapped and exported
by the ISA bus attach code.

Changes from Trevor Mendez <tmendez@bbn.com> to make this compile
with NWSCONS == 0.

update for bus.h, add support for X, and provide use of the bell.

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.

The IST_* and IPL_* constants are not bus-specific; don't treat them as such.
Change splimp -> splnet in Ethernet, ARCnet, and FDDI drivers.

wholesale update from my NetBSD/Alpha source tree. Includes:
Support for AXPpci CPUs,
Support for AlphaStation 600 CPUs,
new boot block structure, which requires an 'installboot'
program and works a lot like the NetBSD/sparc boot blocks.

pc keyboard driver, largely snarfed from i386. should be MI, but
until the i386 is capable of using a 'split' version, no point.

Drivers for PC-like console devices are MI now.

clean up NetBSD RCS ID strings

branches: 1.1.4;
pc keyboard driver, largely snarfed from i386. should be MI, but
until the i386 is capable of using a 'split' version, no point.

Drivers for PC-like console devices are MI now.

delay handle was removed

Adjust for config changes.

Nuke the idea of <machine/options.h>. It completely defeats the purpose
of fine-grain option dependencies.

branches: 1.6.4;
by default, provide RCS IDs for NetBSD/alpha kernel files in kernel binaries.
This can be disabled (to save a bit of space) with the NO_KERNEL_RCSIDS
options, which is present but commented out in the ALPHA config file.
In ELF-format kernels, these strings are present in the kernel binary but
are not loaded into memory. (In ECOFF-format kernels, there's no easy way
to keep them from being loaded, so they _are_ loaded into memory.)

clean up NetBSD RCS ID strings, include machine/options.h

remove all traces of __BROKEN_INDIRECT_CONFIG (except in shared drivers)

update these so they compile whether or not __BROKEN_INDIRECT_CONFIG
is defined.

branches: 1.2.2;
hide a bogosity by not printing a message when pms not attached

Add a primitive driver for the PC-ish Programmable Peripheral Interface
and PC-ish keyboard controller. (Actually, on alphas, the built-in PPI
(in the SIO) appears to be a lobotomized version of the original, but
i'd not call that a bad thing.) This driver should eventually handle all
speaker tone requests and keyboard commands, but for now it just maps
the relevant ports and passes them on to the keyboard and mouse drivers,
which are now its children (rather than children of ISA).

Drivers for PC-like console devices are MI now.

Don't need "delaybah" in the attach args anymore.

clean up NetBSD RCS ID strings

branches: 1.1.2;
Add a primitive driver for the PC-ish Programmable Peripheral Interface
and PC-ish keyboard controller. (Actually, on alphas, the built-in PPI
(in the SIO) appears to be a lobotomized version of the original, but
i'd not call that a bad thing.) This driver should eventually handle all
speaker tone requests and keyboard commands, but for now it just maps
the relevant ports and passes them on to the keyboard and mouse drivers,
which are now its children (rather than children of ISA).

Drivers for PC-like console devices are MI now.

Adjust for config changes.

Nuke the idea of <machine/options.h>. It completely defeats the purpose
of fine-grain option dependencies.

branches: 1.10.4;
by default, provide RCS IDs for NetBSD/alpha kernel files in kernel binaries.
This can be disabled (to save a bit of space) with the NO_KERNEL_RCSIDS
options, which is present but commented out in the ALPHA config file.
In ELF-format kernels, these strings are present in the kernel binary but
are not loaded into memory. (In ECOFF-format kernels, there's no easy way
to keep them from being loaded, so they _are_ loaded into memory.)

clean up NetBSD RCS ID strings, include machine/options.h

remove all traces of __BROKEN_INDIRECT_CONFIG (except in shared drivers)

update these so they compile whether or not __BROKEN_INDIRECT_CONFIG
is defined.

branches: 1.6.2;
Add a primitive driver for the PC-ish Programmable Peripheral Interface
and PC-ish keyboard controller. (Actually, on alphas, the built-in PPI
(in the SIO) appears to be a lobotomized version of the original, but
i'd not call that a bad thing.) This driver should eventually handle all
speaker tone requests and keyboard commands, but for now it just maps
the relevant ports and passes them on to the keyboard and mouse drivers,
which are now its children (rather than children of ISA).

compile cleanly with:
-Werror -Wall -Wstrict-prototypes -Wmissing-prototypes -Wcast-qual

update for new bus.h macros. bus_io_* and bus_mem_* integrated into
single bus_space_* framework. Unfortunately, bus_space_{read,write}_*
operations still imply barriers. That will change soon.

backout previous kprintf change

printf -> kprintf, sprintf -> ksprintf

support for PS/2-style mice

Drivers for PC-like console devices are MI now.

clean up NetBSD RCS ID strings

branches: 1.1.2;
speaker (PIT AUX port) definitions

Drivers for PC-like console devices are MI now.

clean up NetBSD RCS ID strings

branches: 1.1.2;
PC timer definitions

Drivers for PC-like console devices are MI now.

Nuke the idea of <machine/options.h>. It completely defeats the purpose
of fine-grain option dependencies.

branches: 1.7.4; 1.7.6;
by default, provide RCS IDs for NetBSD/alpha kernel files in kernel binaries.
This can be disabled (to save a bit of space) with the NO_KERNEL_RCSIDS
options, which is present but commented out in the ALPHA config file.
In ELF-format kernels, these strings are present in the kernel binary but
are not loaded into memory. (In ECOFF-format kernels, there's no easy way
to keep them from being loaded, so they _are_ loaded into memory.)

clean up NetBSD RCS ID strings, include machine/options.h

remove all traces of __BROKEN_INDIRECT_CONFIG (except in shared drivers)

update these so they compile whether or not __BROKEN_INDIRECT_CONFIG
is defined.

branches: 1.3.2;
move probe and setup code into common functions. always probe (i.e.
even if PCI and the IDs are right), just for sanity, before declaring
success. Split the single 0x3b0 -> 0x3df allocation into three seperate
ones: 0x3b0 -> 0x3bc (leaving the 4 ports available for lpt),
0x3c0 -> 0x3cf, and 0x3d0 -> 0x3df. The former chunk has to be split
off if the lpt can exist there, and it's sort-of pretty to have each
group (based on second hex digit) have its own handle.

try mapping the I/O space (as well as the memory space) in the probe routine.

replace old PCI VGA driver with a common VGA back-end and ISA and PCI
front-ends. Unfortunately, because of the way ISA and PCI are currently
probed, if you have a PCI VGA board in your machine and both drivers
in your kernel, the ISA VGA driver may accidentally match the PCI board.
For now, the only solution to this is to not put both drivers in
the GENERIC kernels.

Drivers for PC-like console devices are MI now.

clean up NetBSD RCS ID strings

branches: 1.2.2;
move probe and setup code into common functions. always probe (i.e.
even if PCI and the IDs are right), just for sanity, before declaring
success. Split the single 0x3b0 -> 0x3df allocation into three seperate
ones: 0x3b0 -> 0x3bc (leaving the 4 ports available for lpt),
0x3c0 -> 0x3cf, and 0x3d0 -> 0x3df. The former chunk has to be split
off if the lpt can exist there, and it's sort-of pretty to have each
group (based on second hex digit) have its own handle.

replace old PCI VGA driver with a common VGA back-end and ISA and PCI
front-ends. Unfortunately, because of the way ISA and PCI are currently
probed, if you have a PCI VGA board in your machine and both drivers
in your kernel, the ISA VGA driver may accidentally match the PCI board.
For now, the only solution to this is to not put both drivers in
the GENERIC kernels.