2005-04-17 02:20:36 +04:00
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Ioctl Numbers
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19 October 1999
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Michael Elizabeth Chastain
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<mec@shout.net>
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If you are adding new ioctl's to the kernel, you should use the _IO
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macros defined in <linux/ioctl.h>:
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_IO an ioctl with no parameters
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_IOW an ioctl with write parameters (copy_from_user)
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_IOR an ioctl with read parameters (copy_to_user)
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_IOWR an ioctl with both write and read parameters.
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'Write' and 'read' are from the user's point of view, just like the
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system calls 'write' and 'read'. For example, a SET_FOO ioctl would
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be _IOW, although the kernel would actually read data from user space;
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a GET_FOO ioctl would be _IOR, although the kernel would actually write
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data to user space.
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The first argument to _IO, _IOW, _IOR, or _IOWR is an identifying letter
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or number from the table below. Because of the large number of drivers,
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many drivers share a partial letter with other drivers.
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If you are writing a driver for a new device and need a letter, pick an
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unused block with enough room for expansion: 32 to 256 ioctl commands.
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You can register the block by patching this file and submitting the
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patch to Linus Torvalds. Or you can e-mail me at <mec@shout.net> and
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I'll register one for you.
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The second argument to _IO, _IOW, _IOR, or _IOWR is a sequence number
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to distinguish ioctls from each other. The third argument to _IOW,
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_IOR, or _IOWR is the type of the data going into the kernel or coming
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out of the kernel (e.g. 'int' or 'struct foo'). NOTE! Do NOT use
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sizeof(arg) as the third argument as this results in your ioctl thinking
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it passes an argument of type size_t.
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Some devices use their major number as the identifier; this is OK, as
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long as it is unique. Some devices are irregular and don't follow any
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convention at all.
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Following this convention is good because:
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(1) Keeping the ioctl's globally unique helps error checking:
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if a program calls an ioctl on the wrong device, it will get an
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error rather than some unexpected behaviour.
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(2) The 'strace' build procedure automatically finds ioctl numbers
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defined with _IO, _IOW, _IOR, or _IOWR.
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(3) 'strace' can decode numbers back into useful names when the
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numbers are unique.
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(4) People looking for ioctls can grep for them more easily when
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this convention is used to define the ioctl numbers.
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(5) When following the convention, the driver code can use generic
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code to copy the parameters between user and kernel space.
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2010-01-09 01:42:34 +03:00
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This table lists ioctls visible from user land for Linux/x86. It contains
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most drivers up to 2.6.31, but I know I am missing some. There has been
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no attempt to list non-X86 architectures or ioctls from drivers/staging/.
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2005-04-17 02:20:36 +04:00
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2010-01-09 01:42:34 +03:00
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Code Seq#(hex) Include File Comments
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2005-04-17 02:20:36 +04:00
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========================================================
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0x00 00-1F linux/fs.h conflict!
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0x00 00-1F scsi/scsi_ioctl.h conflict!
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0x00 00-1F linux/fb.h conflict!
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0x00 00-1F linux/wavefront.h conflict!
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0x02 all linux/fd.h
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0x03 all linux/hdreg.h
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2007-07-16 10:41:42 +04:00
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0x04 D2-DC linux/umsdos_fs.h Dead since 2.6.11, but don't reuse these.
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2005-04-17 02:20:36 +04:00
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0x06 all linux/lp.h
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2010-01-09 01:42:34 +03:00
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0x09 all linux/raid/md_u.h
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0x10 00-0F drivers/char/s390/vmcp.h
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2005-04-17 02:20:36 +04:00
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0x12 all linux/fs.h
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linux/blkpg.h
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0x1b all InfiniBand Subsystem <http://www.openib.org/>
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0x20 all drivers/cdrom/cm206.h
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0x22 all scsi/sg.h
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'#' 00-3F IEEE 1394 Subsystem Block for the entire subsystem
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2010-01-09 01:42:34 +03:00
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'$' 00-0F linux/perf_counter.h, linux/perf_event.h
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2005-04-17 02:20:36 +04:00
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'1' 00-1F <linux/timepps.h> PPS kit from Ulrich Windl
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<ftp://ftp.de.kernel.org/pub/linux/daemons/ntp/PPS/>
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2010-01-09 01:42:34 +03:00
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'2' 01-04 linux/i2o.h
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'3' 00-0F drivers/s390/char/raw3270.h conflict!
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'3' 00-1F linux/suspend_ioctls.h conflict!
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and kernel/power/user.c
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2005-04-17 02:20:36 +04:00
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'8' all SNP8023 advanced NIC card
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<mailto:mcr@solidum.com>
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2010-01-09 01:42:34 +03:00
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'@' 00-0F linux/radeonfb.h conflict!
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'@' 00-0F drivers/video/aty/aty128fb.c conflict!
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'A' 00-1F linux/apm_bios.h conflict!
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'A' 00-0F linux/agpgart.h conflict!
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and drivers/char/agp/compat_ioctl.h
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'A' 00-7F sound/asound.h conflict!
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'B' 00-1F linux/cciss_ioctl.h conflict!
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'B' 00-0F include/linux/pmu.h conflict!
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2005-04-17 02:20:36 +04:00
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'B' C0-FF advanced bbus
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<mailto:maassen@uni-freiburg.de>
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2010-01-09 01:42:34 +03:00
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'C' all linux/soundcard.h conflict!
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'C' 01-2F linux/capi.h conflict!
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'C' F0-FF drivers/net/wan/cosa.h conflict!
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2009-01-07 01:42:41 +03:00
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'D' all arch/s390/include/asm/dasd.h
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2010-01-09 01:42:34 +03:00
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'D' 40-5F drivers/scsi/dpt/dtpi_ioctl.h
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'D' 05 drivers/scsi/pmcraid.h
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'E' all linux/input.h conflict!
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'E' 00-0F xen/evtchn.h conflict!
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'F' all linux/fb.h conflict!
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'F' 01-02 drivers/scsi/pmcraid.h conflict!
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'F' 20 drivers/video/fsl-diu-fb.h conflict!
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'F' 20 drivers/video/intelfb/intelfb.h conflict!
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'F' 20 linux/ivtvfb.h conflict!
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'F' 20 linux/matroxfb.h conflict!
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'F' 20 drivers/video/aty/atyfb_base.c conflict!
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'F' 00-0F video/da8xx-fb.h conflict!
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'F' 80-8F linux/arcfb.h conflict!
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'F' DD video/sstfb.h conflict!
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'G' 00-3F drivers/misc/sgi-gru/grulib.h conflict!
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'G' 00-0F linux/gigaset_dev.h conflict!
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'H' 00-7F linux/hiddev.h conflict!
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'H' 00-0F linux/hidraw.h conflict!
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'H' 00-0F sound/asound.h conflict!
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'H' 20-40 sound/asound_fm.h conflict!
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'H' 80-8F sound/sfnt_info.h conflict!
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'H' 10-8F sound/emu10k1.h conflict!
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'H' 10-1F sound/sb16_csp.h conflict!
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'H' 10-1F sound/hda_hwdep.h conflict!
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'H' 40-4F sound/hdspm.h conflict!
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'H' 40-4F sound/hdsp.h conflict!
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'H' 90 sound/usb/usx2y/usb_stream.h
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'H' C0-F0 net/bluetooth/hci.h conflict!
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'H' C0-DF net/bluetooth/hidp/hidp.h conflict!
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'H' C0-DF net/bluetooth/cmtp/cmtp.h conflict!
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'H' C0-DF net/bluetooth/bnep/bnep.h conflict!
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'I' all linux/isdn.h conflict!
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'I' 00-0F drivers/isdn/divert/isdn_divert.h conflict!
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'I' 40-4F linux/mISDNif.h conflict!
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2005-04-17 02:20:36 +04:00
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'J' 00-1F drivers/scsi/gdth_ioctl.h
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'K' all linux/kd.h
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2010-01-09 01:42:34 +03:00
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'L' 00-1F linux/loop.h conflict!
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'L' 10-1F drivers/scsi/mpt2sas/mpt2sas_ctl.h conflict!
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2005-04-17 02:20:36 +04:00
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'L' E0-FF linux/ppdd.h encrypted disk device driver
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<http://linux01.gwdg.de/~alatham/ppdd.html>
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2010-01-09 01:42:34 +03:00
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'M' all linux/soundcard.h conflict!
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'M' 01-16 mtd/mtd-abi.h conflict!
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and drivers/mtd/mtdchar.c
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'M' 01-03 drivers/scsi/megaraid/megaraid_sas.h
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'M' 00-0F drivers/video/fsl-diu-fb.h conflict!
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2005-04-17 02:20:36 +04:00
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'N' 00-1F drivers/usb/scanner.h
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2010-01-09 01:42:34 +03:00
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'O' 00-06 mtd/ubi-user.h UBI
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'P' all linux/soundcard.h conflict!
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'P' 60-6F sound/sscape_ioctl.h conflict!
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'P' 00-0F drivers/usb/class/usblp.c conflict!
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2005-04-17 02:20:36 +04:00
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'Q' all linux/soundcard.h
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2010-01-09 01:42:34 +03:00
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'R' 00-1F linux/random.h conflict!
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'R' 01 linux/rfkill.h conflict!
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'R' 01-0F media/rds.h conflict!
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'R' C0-DF net/bluetooth/rfcomm.h
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2005-04-17 02:20:36 +04:00
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'S' all linux/cdrom.h conflict!
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'S' 80-81 scsi/scsi_ioctl.h conflict!
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'S' 82-FF scsi/scsi.h conflict!
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2010-01-09 01:42:34 +03:00
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'S' 00-7F sound/asequencer.h conflict!
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2005-04-17 02:20:36 +04:00
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'T' all linux/soundcard.h conflict!
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2010-01-09 01:42:34 +03:00
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'T' 00-AF sound/asound.h conflict!
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2009-01-07 01:42:41 +03:00
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'T' all arch/x86/include/asm/ioctls.h conflict!
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2010-01-09 01:42:34 +03:00
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'T' C0-DF linux/if_tun.h conflict!
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'U' all sound/asound.h conflict!
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'U' 00-0F drivers/media/video/uvc/uvcvideo.h conflict!
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'U' 00-CF linux/uinput.h conflict!
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'U' 00-EF linux/usbdevice_fs.h
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'U' C0-CF drivers/bluetooth/hci_uart.h
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'V' all linux/vt.h conflict!
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'V' all linux/videodev2.h conflict!
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'V' C0 linux/ivtvfb.h conflict!
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'V' C0 linux/ivtv.h conflict!
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'V' C0 media/davinci/vpfe_capture.h conflict!
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'V' C0 media/si4713.h conflict!
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'V' C0-CF drivers/media/video/mxb.h conflict!
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2005-04-17 02:20:36 +04:00
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'W' 00-1F linux/watchdog.h conflict!
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'W' 00-1F linux/wanrouter.h conflict!
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2010-01-09 01:42:34 +03:00
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'W' 00-3F sound/asound.h conflict!
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'X' all fs/xfs/xfs_fs.h conflict!
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and fs/xfs/linux-2.6/xfs_ioctl32.h
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and include/linux/falloc.h
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and linux/fs.h
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'X' all fs/ocfs2/ocfs_fs.h conflict!
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'X' 01 linux/pktcdvd.h conflict!
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2005-04-17 02:20:36 +04:00
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'Y' all linux/cyclades.h
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2010-01-09 01:42:34 +03:00
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'Z' 14-15 drivers/message/fusion/mptctl.h
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'[' 00-07 linux/usb/tmc.h USB Test and Measurement Devices
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2008-08-27 03:22:06 +04:00
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<mailto:gregkh@suse.de>
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2010-01-09 01:42:34 +03:00
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'a' all linux/atm*.h, linux/sonet.h ATM on linux
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2005-04-17 02:20:36 +04:00
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<http://lrcwww.epfl.ch/linux-atm/magic.html>
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2010-01-09 01:42:34 +03:00
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'b' 00-FF conflict! bit3 vme host bridge
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2005-04-17 02:20:36 +04:00
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<mailto:natalia@nikhefk.nikhef.nl>
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2010-01-09 01:42:34 +03:00
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'b' 00-0F media/bt819.h conflict!
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'c' all linux/cm4000_cs.h conflict!
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2005-04-17 02:20:36 +04:00
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'c' 00-7F linux/comstats.h conflict!
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'c' 00-7F linux/coda.h conflict!
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2010-01-09 01:42:34 +03:00
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'c' 00-1F linux/chio.h conflict!
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'c' 80-9F arch/s390/include/asm/chsc.h conflict!
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'c' A0-AF arch/x86/include/asm/msr.h conflict!
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2005-04-17 02:20:36 +04:00
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'd' 00-FF linux/char/drm/drm/h conflict!
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2010-01-09 01:42:34 +03:00
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'd' 02-40 pcmcia/ds.h conflict!
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'd' 10-3F drivers/media/video/dabusb.h conflict!
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'd' C0-CF drivers/media/video/saa7191.h conflict!
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2005-04-17 02:20:36 +04:00
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'd' F0-FF linux/digi1.h
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'e' all linux/digi1.h conflict!
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2010-01-09 01:42:34 +03:00
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'e' 00-1F drivers/net/irda/irtty-sir.h conflict!
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'f' 00-1F linux/ext2_fs.h conflict!
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'f' 00-1F linux/ext3_fs.h conflict!
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'f' 00-0F fs/jfs/jfs_dinode.h conflict!
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'f' 00-0F fs/ext4/ext4.h conflict!
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'f' 00-0F linux/fs.h conflict!
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'f' 00-0F fs/ocfs2/ocfs2_fs.h conflict!
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'g' 00-0F linux/usb/gadgetfs.h
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'g' 20-2F linux/usb/g_printer.h
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'h' 00-7F conflict! Charon filesystem
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2005-04-17 02:20:36 +04:00
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<mailto:zapman@interlan.net>
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2010-01-09 01:42:34 +03:00
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'h' 00-1F linux/hpet.h conflict!
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'i' 00-3F linux/i2o-dev.h conflict!
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'i' 0B-1F linux/ipmi.h conflict!
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'i' 80-8F linux/i8k.h
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2005-04-17 02:20:36 +04:00
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'j' 00-3F linux/joystick.h
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2010-01-09 01:42:34 +03:00
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'k' 00-0F linux/spi/spidev.h conflict!
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'k' 00-05 video/kyro.h conflict!
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2005-04-17 02:20:36 +04:00
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'l' 00-3F linux/tcfs_fs.h transparent cryptographic file system
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<http://mikonos.dia.unisa.it/tcfs>
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'l' 40-7F linux/udf_fs_i.h in development:
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2005-11-22 08:32:31 +03:00
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<http://sourceforge.net/projects/linux-udf/>
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2010-01-09 01:42:34 +03:00
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'm' 00-09 linux/mmtimer.h conflict!
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2005-04-17 02:20:36 +04:00
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'm' all linux/mtio.h conflict!
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'm' all linux/soundcard.h conflict!
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'm' all linux/synclink.h conflict!
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2010-01-09 01:42:34 +03:00
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'm' 00-19 drivers/message/fusion/mptctl.h conflict!
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'm' 00 drivers/scsi/megaraid/megaraid_ioctl.h conflict!
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2005-04-17 02:20:36 +04:00
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'm' 00-1F net/irda/irmod.h conflict!
|
2010-01-09 01:42:34 +03:00
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'n' 00-7F linux/ncp_fs.h and fs/ncpfs/ioctl.c
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2009-08-08 12:52:50 +04:00
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'n' 80-8F linux/nilfs2_fs.h NILFS2
|
2010-01-09 01:42:34 +03:00
|
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'n' E0-FF linux/matroxfb.h matroxfb
|
2007-12-18 10:46:37 +03:00
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'o' 00-1F fs/ocfs2/ocfs2_fs.h OCFS2
|
2010-01-09 01:42:34 +03:00
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|
'o' 00-03 mtd/ubi-user.h conflict! (OCFS2 and UBI overlaps)
|
|
|
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'o' 40-41 mtd/ubi-user.h UBI
|
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|
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'o' 01-A1 linux/dvb/*.h DVB
|
2007-05-08 11:31:45 +04:00
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'p' 00-0F linux/phantom.h conflict! (OpenHaptics needs this)
|
2010-01-09 01:42:34 +03:00
|
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'p' 00-1F linux/rtc.h conflict!
|
2007-05-08 11:31:45 +04:00
|
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'p' 00-3F linux/mc146818rtc.h conflict!
|
2005-04-17 02:20:36 +04:00
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'p' 40-7F linux/nvram.h
|
2010-01-09 01:42:34 +03:00
|
|
|
'p' 80-9F linux/ppdev.h user-space parport
|
2005-04-17 02:20:36 +04:00
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|
|
<mailto:tim@cyberelk.net>
|
2010-01-09 01:42:34 +03:00
|
|
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'p' A1-A4 linux/pps.h LinuxPPS
|
2009-06-18 03:28:37 +04:00
|
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|
<mailto:giometti@linux.it>
|
2005-04-17 02:20:36 +04:00
|
|
|
'q' 00-1F linux/serio.h
|
2010-01-09 01:42:34 +03:00
|
|
|
'q' 80-FF linux/telephony.h Internet PhoneJACK, Internet LineJACK
|
|
|
|
|
linux/ixjuser.h <http://www.quicknet.net>
|
|
|
|
|
'r' 00-1F linux/msdos_fs.h and fs/fat/dir.c
|
2005-04-17 02:20:36 +04:00
|
|
|
's' all linux/cdk.h
|
|
|
|
|
't' 00-7F linux/if_ppp.h
|
|
|
|
|
't' 80-8F linux/isdn_ppp.h
|
2010-01-09 01:42:34 +03:00
|
|
|
't' 90 linux/toshiba.h
|
2005-04-17 02:20:36 +04:00
|
|
|
'u' 00-1F linux/smb_fs.h
|
|
|
|
|
'v' all linux/videodev.h conflict!
|
2010-01-09 01:42:34 +03:00
|
|
|
'v' 00-1F linux/ext2_fs.h conflict!
|
|
|
|
|
'v' 00-1F linux/fs.h conflict!
|
|
|
|
|
'v' 00-0F linux/sonypi.h conflict!
|
|
|
|
|
'v' C0-CF drivers/media/video/ov511.h conflict!
|
|
|
|
|
'v' C0-DF media/pwc-ioctl.h conflict!
|
|
|
|
|
'v' C0-FF linux/meye.h conflict!
|
|
|
|
|
'v' C0-CF drivers/media/video/zoran/zoran.h conflict!
|
|
|
|
|
'v' D0-DF drivers/media/video/cpia2/cpia2dev.h conflict!
|
2005-04-17 02:20:36 +04:00
|
|
|
'w' all CERN SCI driver
|
|
|
|
|
'y' 00-1F packet based user level communications
|
|
|
|
|
<mailto:zapman@interlan.net>
|
2010-01-09 01:42:34 +03:00
|
|
|
'z' 00-3F CAN bus card conflict!
|
2005-04-17 02:20:36 +04:00
|
|
|
<mailto:hdstich@connectu.ulm.circular.de>
|
2010-01-09 01:42:34 +03:00
|
|
|
'z' 40-7F CAN bus card conflict!
|
2005-04-17 02:20:36 +04:00
|
|
|
<mailto:oe@port.de>
|
2010-01-09 01:42:34 +03:00
|
|
|
'z' 10-4F drivers/s390/crypto/zcrypt_api.h conflict!
|
2005-04-17 02:20:36 +04:00
|
|
|
0x80 00-1F linux/fb.h
|
|
|
|
|
0x81 00-1F linux/videotext.h
|
2010-01-09 01:42:34 +03:00
|
|
|
0x88 00-3F media/ovcamchip.h
|
2009-01-07 01:42:41 +03:00
|
|
|
0x89 00-06 arch/x86/include/asm/sockios.h
|
2005-04-17 02:20:36 +04:00
|
|
|
0x89 0B-DF linux/sockios.h
|
|
|
|
|
0x89 E0-EF linux/sockios.h SIOCPROTOPRIVATE range
|
2010-01-09 01:42:34 +03:00
|
|
|
0x89 E0-EF linux/dn.h PROTOPRIVATE range
|
2005-04-17 02:20:36 +04:00
|
|
|
0x89 F0-FF linux/sockios.h SIOCDEVPRIVATE range
|
|
|
|
|
0x8B all linux/wireless.h
|
|
|
|
|
0x8C 00-3F WiNRADiO driver
|
|
|
|
|
<http://www.proximity.com.au/~brian/winradio/>
|
|
|
|
|
0x90 00 drivers/cdrom/sbpcd.h
|
2010-01-09 01:42:34 +03:00
|
|
|
0x92 00-0F drivers/usb/mon/mon_bin.c
|
2005-04-17 02:20:36 +04:00
|
|
|
0x93 60-7F linux/auto_fs.h
|
2010-01-09 01:42:34 +03:00
|
|
|
0x94 all fs/btrfs/ioctl.h
|
2010-03-19 19:43:06 +03:00
|
|
|
0x97 00-7F fs/ceph/ioctl.h Ceph file system
|
2005-04-17 02:20:36 +04:00
|
|
|
0x99 00-0F 537-Addinboard driver
|
|
|
|
|
<mailto:buk@buks.ipn.de>
|
|
|
|
|
0xA0 all linux/sdp/sdp.h Industrial Device Project
|
|
|
|
|
<mailto:kenji@bitgate.com>
|
|
|
|
|
0xA3 80-8F Port ACL in development:
|
|
|
|
|
<mailto:tlewis@mindspring.com>
|
|
|
|
|
0xA3 90-9F linux/dtlk.h
|
|
|
|
|
0xAB 00-1F linux/nbd.h
|
|
|
|
|
0xAC 00-1F linux/raw.h
|
|
|
|
|
0xAD 00 Netfilter device in development:
|
2010-01-09 01:42:34 +03:00
|
|
|
<mailto:rusty@rustcorp.com.au>
|
2008-04-06 15:25:46 +04:00
|
|
|
0xAE all linux/kvm.h Kernel-based Virtual Machine
|
2009-08-13 18:35:48 +04:00
|
|
|
<mailto:kvm@vger.kernel.org>
|
2005-04-17 02:20:36 +04:00
|
|
|
0xB0 all RATIO devices in development:
|
|
|
|
|
<mailto:vgo@ratio.de>
|
|
|
|
|
0xB1 00-1F PPPoX <mailto:mostrows@styx.uwaterloo.ca>
|
2010-01-09 01:42:34 +03:00
|
|
|
0xC0 00-0F linux/usb/iowarrior.h
|
2005-04-17 02:20:36 +04:00
|
|
|
0xCB 00-1F CBM serial IEC bus in development:
|
|
|
|
|
<mailto:michael.klein@puffin.lb.shuttle.de>
|
2010-01-09 01:42:34 +03:00
|
|
|
0xCD 01 linux/reiserfs_fs.h
|
|
|
|
|
0xCF 02 fs/cifs/ioctl.c
|
|
|
|
|
0xDB 00-0F drivers/char/mwave/mwavepub.h
|
2005-04-17 02:20:36 +04:00
|
|
|
0xDD 00-3F ZFCP device driver see drivers/s390/scsi/
|
|
|
|
|
<mailto:aherrman@de.ibm.com>
|
2010-01-09 01:42:34 +03:00
|
|
|
0xF3 00-3F drivers/usb/misc/sisusbvga/sisusb.h sisfb (in development)
|
2005-04-17 02:20:36 +04:00
|
|
|
<mailto:thomas@winischhofer.net>
|
2006-12-08 13:40:37 +03:00
|
|
|
0xF4 00-1F video/mbxfb.h mbxfb
|
|
|
|
|
<mailto:raph@8d.com>
|
2010-01-09 01:42:34 +03:00
|
|
|
0xFD all linux/dm-ioctl.h
|
