Commit Graph

513 Commits

Author SHA1 Message Date
Mark Murray
d1b06863fb Huge cleanup of random(4) code.
* GENERAL
- Update copyright.
- Make kernel options for RANDOM_YARROW and RANDOM_DUMMY. Set
  neither to ON, which means we want Fortuna
- If there is no 'device random' in the kernel, there will be NO
  random(4) device in the kernel, and the KERN_ARND sysctl will
  return nothing. With RANDOM_DUMMY there will be a random(4) that
  always blocks.
- Repair kern.arandom (KERN_ARND sysctl). The old version went
  through arc4random(9) and was a bit weird.
- Adjust arc4random stirring a bit - the existing code looks a little
  suspect.
- Fix the nasty pre- and post-read overloading by providing explictit
  functions to do these tasks.
- Redo read_random(9) so as to duplicate random(4)'s read internals.
  This makes it a first-class citizen rather than a hack.
- Move stuff out of locked regions when it does not need to be
  there.
- Trim RANDOM_DEBUG printfs. Some are excess to requirement, some
  behind boot verbose.
- Use SYSINIT to sequence the startup.
- Fix init/deinit sysctl stuff.
- Make relevant sysctls also tunables.
- Add different harvesting "styles" to allow for different requirements
  (direct, queue, fast).
- Add harvesting of FFS atime events. This needs to be checked for
  weighing down the FS code.
- Add harvesting of slab allocator events. This needs to be checked for
  weighing down the allocator code.
- Fix the random(9) manpage.
- Loadable modules are not present for now. These will be re-engineered
  when the dust settles.
- Use macros for locks.
- Fix comments.

* src/share/man/...
- Update the man pages.

* src/etc/...
- The startup/shutdown work is done in D2924.

* src/UPDATING
- Add UPDATING announcement.

* src/sys/dev/random/build.sh
- Add copyright.
- Add libz for unit tests.

* src/sys/dev/random/dummy.c
- Remove; no longer needed. Functionality incorporated into randomdev.*.

* live_entropy_sources.c live_entropy_sources.h
- Remove; content moved.
- move content to randomdev.[ch] and optimise.

* src/sys/dev/random/random_adaptors.c src/sys/dev/random/random_adaptors.h
- Remove; plugability is no longer used. Compile-time algorithm
  selection is the way to go.

* src/sys/dev/random/random_harvestq.c src/sys/dev/random/random_harvestq.h
- Add early (re)boot-time randomness caching.

* src/sys/dev/random/randomdev_soft.c src/sys/dev/random/randomdev_soft.h
- Remove; no longer needed.

* src/sys/dev/random/uint128.h
- Provide a fake uint128_t; if a real one ever arrived, we can use
  that instead. All that is needed here is N=0, N++, N==0, and some
  localised trickery is used to manufacture a 128-bit 0ULLL.

* src/sys/dev/random/unit_test.c src/sys/dev/random/unit_test.h
- Improve unit tests; previously the testing human needed clairvoyance;
  now the test will do a basic check of compressibility. Clairvoyant
  talent is still a good idea.
- This is still a long way off a proper unit test.

* src/sys/dev/random/fortuna.c src/sys/dev/random/fortuna.h
- Improve messy union to just uint128_t.
- Remove unneeded 'static struct fortuna_start_cache'.
- Tighten up up arithmetic.
- Provide a method to allow eternal junk to be introduced; harden
  it against blatant by compress/hashing.
- Assert that locks are held correctly.
- Fix the nasty pre- and post-read overloading by providing explictit
  functions to do these tasks.
- Turn into self-sufficient module (no longer requires randomdev_soft.[ch])

* src/sys/dev/random/yarrow.c src/sys/dev/random/yarrow.h
- Improve messy union to just uint128_t.
- Remove unneeded 'staic struct start_cache'.
- Tighten up up arithmetic.
- Provide a method to allow eternal junk to be introduced; harden
  it against blatant by compress/hashing.
- Assert that locks are held correctly.
- Fix the nasty pre- and post-read overloading by providing explictit
  functions to do these tasks.
- Turn into self-sufficient module (no longer requires randomdev_soft.[ch])
- Fix some magic numbers elsewhere used as FAST and SLOW.

Differential Revision: https://reviews.freebsd.org/D2025
Reviewed by: vsevolod,delphij,rwatson,trasz,jmg
Approved by: so (delphij)
2015-06-30 17:00:45 +00:00
Andriy Gapon
85f95fffd7 hook userland threads suspend + resume into acpi suspend code
Also, split power_suspend into power_suspend and power_suspend_early.

power_suspend_early is called before the userland is frozen.
power_suspend is called after the userland is frozen.

Currently only VT switching is hooked to power_suspend_early.
This is needed because switching away from X server requires its
cooperation, so obviously X server must not be frozen when that happens.

Freezing userland during ACPI suspend is useful because not all drivers
correctly handle suspension concurrent with other activity.  This is
especially applicable to drivers ported from other operating systems
that suspend all software activity between placing drivers and hardware
into suspended state.
In particular drm2/radeon (radeonkms) depends on the described
procedure.  The driver does not have any internal synchronization
between suspension activities and processing of userland requests.

Many thanks to kib for the code that allows to freeze and thaw all
userland threads.

Note that ideally we also need to park / inhibit (non-special) kernel
threads as well to ensure that they do not call into drivers.

MFC after:	17 days
2015-01-27 17:33:18 +00:00
Hans Petter Selasky
af3b2549c4 Pull in r267961 and r267973 again. Fix for issues reported will follow. 2014-06-28 03:56:17 +00:00
Glen Barber
37a107a407 Revert r267961, r267973:
These changes prevent sysctl(8) from returning proper output,
such as:

 1) no output from sysctl(8)
 2) erroneously returning ENOMEM with tools like truss(1)
    or uname(1)
 truss: can not get etype: Cannot allocate memory
2014-06-27 22:05:21 +00:00
Ed Maste
59644098f8 Use a common tunable to choose between vt(4)/sc(4)
With this change and previous work from ray@ it will be possible to put
both in GENERIC, and have one enabled by default, but allow the other to
be selected via the loader.

(The previous implementation had separate kern.vt.disable and
hw.syscons.disable tunables, and would panic if both drivers were
compiled in and neither was explicitly disabled.)

MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
2014-06-27 17:50:33 +00:00
Hans Petter Selasky
3da1cf1e88 Extend the meaning of the CTLFLAG_TUN flag to automatically check if
there is an environment variable which shall initialize the SYSCTL
during early boot. This works for all SYSCTL types both statically and
dynamically created ones, except for the SYSCTL NODE type and SYSCTLs
which belong to VNETs. A new flag, CTLFLAG_NOFETCH, has been added to
be used in the case a tunable sysctl has a custom initialisation
function allowing the sysctl to still be marked as a tunable. The
kernel SYSCTL API is mostly the same, with a few exceptions for some
special operations like iterating childrens of a static/extern SYSCTL
node. This operation should probably be made into a factored out
common macro, hence some device drivers use this. The reason for
changing the SYSCTL API was the need for a SYSCTL parent OID pointer
and not only the SYSCTL parent OID list pointer in order to quickly
generate the sysctl path. The motivation behind this patch is to avoid
parameter loading cludges inside the OFED driver subsystem. Instead of
adding special code to the OFED driver subsystem to post-load tunables
into dynamically created sysctls, we generalize this in the kernel.

Other changes:
- Corrected a possibly incorrect sysctl name from "hw.cbb.intr_mask"
to "hw.pcic.intr_mask".
- Removed redundant TUNABLE statements throughout the kernel.
- Some minor code rewrites in connection to removing not needed
TUNABLE statements.
- Added a missing SYSCTL_DECL().
- Wrapped two very long lines.
- Avoid malloc()/free() inside sysctl string handling, in case it is
called to initialize a sysctl from a tunable, hence malloc()/free() is
not ready when sysctls from the sysctl dataset are registered.
- Bumped FreeBSD version to indicate SYSCTL API change.

MFC after:	2 weeks
Sponsored by:	Mellanox Technologies
2014-06-27 16:33:43 +00:00
Aleksandr Rybalko
3fc3ca2652 Allow to disable syscons(4) if "hw.syscons.disable" kenv is set.
Sponsored by:	The FreeBSD Foundation
2014-06-18 22:23:10 +00:00
Mark Murray
f02e47dc1e Snapshot. This passes the build test, but has not yet been finished or debugged.
Contains:

* Refactor the hardware RNG CPU instruction sources to feed into
the software mixer. This is unfinished. The actual harvesting needs
to be sorted out. Modified by me (see below).

* Remove 'frac' parameter from random_harvest(). This was never
used and adds extra code for no good reason.

* Remove device write entropy harvesting. This provided a weak
attack vector, was not very good at bootstrapping the device. To
follow will be a replacement explicit reseed knob.

* Separate out all the RANDOM_PURE sources into separate harvest
entities. This adds some secuity in the case where more than one
is present.

* Review all the code and fix anything obviously messy or inconsistent.
Address som review concerns while I'm here, like rename the pseudo-rng
to 'dummy'.

Submitted by:	Arthur Mesh <arthurmesh@gmail.com> (the first item)
2013-10-04 06:55:06 +00:00
Jung-uk Kim
ba53f0d5ca Reload font when syscons(4) is resuming without switching mode.
Reported by:	adrian (more than a year ago)
Prodded by:	adrian (less than a month ago)
2013-07-17 23:29:56 +00:00
Davide Italiano
6b98f11545 MFcalloutng (r244249, r244306 by mav):
- Switch syscons from timeout() to callout_reset_flags() and specify that
precision is not important there -- anything from 20 to 30Hz will be fine.
- Reduce syscons "refresh" rate to 1-2Hz when console is in graphics mode
and there is nothing to do except some polling for keyboard.  Text mode
refresh would also be nice to have adaptive, but this change at least
should help laptop users who running X.

Sponsored by:	Google Summer of Code 2012, iXsystems inc.
Tested by:	flo, marius, ian, markj, Fabian Keil
2013-03-04 14:00:58 +00:00
Hans Petter Selasky
68fdacf7c5 Make sure that all mouse buttons are released when clients
using /dev/consolectl close. This fixes a problem where if
a USB mouse is detached while a button is pressed, that
button is never released.

MFC after:	1 week
2013-02-06 11:16:18 +00:00
Oleksandr Tymoshenko
e1f04cd024 Piggyback MIPS changes and add ARM syscons support for devices with
framebuffer

While here - sort #if defined() order alphabetically
2012-08-25 23:59:31 +00:00
Robert Watson
8122a592ee Provide basic glue to allow syscons to be used on MIPS, modelled
on PowerPC support.  This was clearly not something syscons was
designed to do (very specific assumptions about the nature of VGA
consoles on PCs), but fortunately others have long since blazed
the way on making it work regardless of that.

Sponsored by:	DARPA, AFRL
2012-08-25 08:09:37 +00:00
Hans Petter Selasky
d1eacc02f1 Move tty_opened_ns() into syscons.c which is currently the
only client of this macro.

Suggested by:	ed @
MFC after:	1 week
2012-03-29 15:47:29 +00:00
Hans Petter Selasky
8dbeb1b6cc Fix for NULL-pointer panic during boot, if keys are pressed too early.
MFC after:	1 week
2012-03-29 14:53:14 +00:00
Ulrich Spörlein
9a14aa017b Convert files to UTF-8 2012-01-15 13:23:18 +00:00
Andriy Gapon
b133becced sc_cngrab: switch to console vty when possible
In the future we may want to perform the switch even if the console is
currently in the graphics mode by trying to reset the video adapter first
(e.g. by executing vesa/vga bios post).  That would probably require
some sort of a one-way flag as returning the control of the console back
to the interrupted application most likely would result in a mess.

Reviewed by:	emaste
MFC after:	2 months
2011-12-21 12:21:22 +00:00
Andriy Gapon
8f3ae92165 syscons: provide a first iteration of cngrab/cnungrab implementation
- put underlying keyboard(s) into the polling mode for the whole
  duration of the grab, instead of the previous behavior of going into
  and out of the polling mode around each polling attempt
- ditto for setting K_XLATE mode and enabling a disabled keyboard

Inspired by:	bde
MFC after:	2 months
2011-12-17 15:57:39 +00:00
Andriy Gapon
9976156f12 kern cons: introduce infrastructure for console grabbing by kernel
At the moment grab and ungrab methods of all console drivers are no-ops.

Current intended meaning of the calls is that the kernel takes control of
console input.  In the future the semantics may be extended to mean that
the calling thread takes full ownership of the console (e.g. console
output from other threads could be suspended).

Inspired by:	bde
MFC after:	2 months
2011-12-17 15:08:43 +00:00
Andriy Gapon
8538a18594 syscons: make sc_puts static as it is used only privately
Perhaps sc_puts should also be renamed to scputs to follow the implied
naming conventions in the file...

MFC after:	2 weeks
2011-12-11 21:10:11 +00:00
Ed Schouten
6472ac3d8a Mark all SYSCTL_NODEs static that have no corresponding SYSCTL_DECLs.
The SYSCTL_NODE macro defines a list that stores all child-elements of
that node. If there's no SYSCTL_DECL macro anywhere else, there's no
reason why it shouldn't be static.
2011-11-07 15:43:11 +00:00
Kip Macy
8451d0dd78 In order to maximize the re-usability of kernel code in user space this
patch modifies makesyscalls.sh to prefix all of the non-compatibility
calls (e.g. not linux_, freebsd32_) with sys_ and updates the kernel
entry points and all places in the code that use them. It also
fixes an additional name space collision between the kernel function
psignal and the libc function of the same name by renaming the kernel
psignal kern_psignal(). By introducing this change now we will ease future
MFCs that change syscalls.

Reviewed by:	rwatson
Approved by:	re (bz)
2011-09-16 13:58:51 +00:00
Robert Watson
a608af7817 Add support for alternative break-to-debugger to syscons(4). While most
keyboards allow console break sequences (such as ctrl-alt-esc) to be
entered, alternative break can prove useful under virtualisation and
remote console systems where entering control sequences can be
difficult or unreliable.

MFC after:	3 weeks
Approved by:	re (bz)
2011-08-27 22:10:45 +00:00
Robert Watson
4cf7545589 Attempt to make break-to-debugger and alternative break-to-debugger more
accessible:

(1) Always compile in support for breaking into the debugger if options
    KDB is present in the kernel.

(2) Disable both by default, but allow them to be enabled via tunables
    and sysctls debug.kdb.break_to_debugger and
    debug.kdb.alt_break_to_debugger.

(3) options BREAK_TO_DEBUGGER and options ALT_BREAK_TO_DEBUGGER continue
    to behave as before -- only now instead of compiling in
    break-to-debugger support, they change the default values of the
    above sysctls to enable those features by default.  Current kernel
    configurations should, therefore, continue to behave as expected.

(4) Migrate alternative break-to-debugger state machine logic out of
    individual device drivers into centralised KDB code.  This has a
    number of upsides, but also one downside: it's now tricky to release
    sio spin locks when entering the debugger, so we don't.  However,
    similar logic does not exist in other device drivers, including uart.

(5) dcons requires some special handling; unlike other console types, it
    allows overriding KDB's own debugger selection, so we need a new
    interface to KDB to allow that to work.

GENERIC kernels in -CURRENT will now support break-to-debugger as long as
appropriate boot/run-time options are set, which should improve the
debuggability of BETA kernels significantly.

MFC after:	3 weeks
Reviewed by:	kib, nwhitehorn
Approved by:	re (bz)
2011-08-26 21:46:36 +00:00
Ed Schouten
78d4d8eeb2 Restore binary compatibility for GIO_KEYMAP and PIO_KEYMAP.
Back in 2009 I changed the ABI of the GIO_KEYMAP and PIO_KEYMAP ioctls
to support wide characters. I created a patch to add ABI compatibility
for the old calls, but I didn't get any feedback to that.

It seems now people are upgrading from 8 to 9 they experience this
issue, so add it anyway.
2011-07-17 08:19:19 +00:00
Jung-uk Kim
b10c3d1c15 Move VT switching hack for suspend/resume from bus drivers to syscons.c
using event handlers.  A different version was

Submitted by:	Taku YAMAMOTO (taku at tackymt dot homeip dot net)
2011-05-09 18:46:49 +00:00
Jung-uk Kim
1658038ce7 Rename a variable to match scvidctl.c. 2010-11-30 17:34:15 +00:00
Jung-uk Kim
732e8e1632 Stop hardcoding default font size. 2010-11-30 17:32:28 +00:00
Jung-uk Kim
82515b4f1f Clean up code a bit to make it more readable. 2010-11-29 22:20:44 +00:00
Jung-uk Kim
0cb06f72d5 Honor font size for the video mode when default fonts are compiled in kernel
and VESA mode is enabled from loader.
2010-11-29 22:19:19 +00:00
Rui Paulo
cd1fa5bd4d Explicitly tell the compiler that we don't care about the return value
of kbdd_ioctl().
2010-10-13 11:37:12 +00:00
Jung-uk Kim
dd962f5b8a Suspend screen updates when the video controller is powered down. 2010-05-22 07:35:17 +00:00
Jung-uk Kim
4cc5f38e97 Refine r204265. We want the standard VGA palette for packed pixel mode. 2010-03-29 22:41:30 +00:00
Jung-uk Kim
4a9b63a454 Improve VESA mode switching via loader tunable `hint.sc.0.vesa_mode'.
The most notable change is history buffer is fully saved/restored now.
2010-02-24 20:13:34 +00:00
Jung-uk Kim
8d521790d0 Yet another attempt to make palette loading more safer:
- Add a separate palette data for 8-bit DAC mode when SC_PIXEL_MODE is set
and fill it up with default gray-scale palette data for text.  Now we don't
have to set `hint.sc.0.vesa_mode' to get the default palette data.
- Add a new adapter flag, V_ADP_DAC8 to track whether the controller is
using 8-bit palette format and load correct palette when switching modes.
- Set 8-bit DAC mode only for non-VGA compatible graphics mode.
2010-02-23 21:51:14 +00:00
Robert Noland
cfd7bacef2 Update d_mmap() to accept vm_ooffset_t and vm_memattr_t.
This replaces d_mmap() with the d_mmap2() implementation and also
changes the type of offset to vm_ooffset_t.

Purge d_mmap2().

All driver modules will need to be rebuilt since D_VERSION is also
bumped.

Reviewed by:	jhb@
MFC after:	Not in this lifetime...
2009-12-29 21:51:28 +00:00
Ed Schouten
3a8a07eadd Allow Syscons terminal emulators to provide function key strings.
xterm and cons25 have some incompatibilities when it comes to escape
sequences for special keys, such as F1 to F12, home, end, etc. Add a new
te_fkeystr() that can be used to override the strings.

scterm-sck won't do anything with this, but scterm-teken will use
teken_get_sequences() to obtain the proper sequence.
2009-11-11 08:20:19 +00:00
Jung-uk Kim
761eeb5fff Fix VESA color palette corruption:
- VBE 3.0 says palette format resets to 6-bit mode when video mode changes.
We simply set 8-bit mode when we switch modes if the adapter supports it.
- VBE 3.0 also says if the mode is not VGA compatible, we must use VBE
function to save/restore palette.  Otherwise, VGA function may be used.
Thus, reinstate the save/load palette functions only for non-VGA compatible
modes regardless of its palette format.
- Let vesa(4) set VESA modes even if vga(4) claims to support it.
- Reset default palette if VESA pixel mode is set initially.
- Fix more style nits.
2009-11-03 20:22:09 +00:00
Jung-uk Kim
974f3534c0 Search for default 800x600 graphics mode from supported VESA mode list.
Many video controllers do not support 800x600x24 mode any more.
2009-10-23 18:53:21 +00:00
Ed Schouten
53e69c0c2a Add support for VT200-style mouse input.
Right now if applications want to use the mouse on the command line,
they use sysmouse(4) and install a signal handler in the kernel to
deliver signals when mouse events arrive. This conflicts with my plan to
change to TERM=xterm, so implement proper VT200-style mouse input.

Because mouse input is now streamed through the TTY, it means you can
now SSH to another system on the console and use the mouse there as
well. The disadvantage of the VT200 mouse protocol, is that it doesn't
seem to generate events when moving the cursor. Only when pressing and
releasing mouse buttons.

There are different protocols as well, but this one seems to be most
commonly supported.

Reported by:	Paul B. Mahol <onemda gmail com>
Tested with:	vim(1)
2009-09-27 18:19:41 +00:00
Ed Schouten
790dd1b5af Just use ttydisc_rint_simple() instead of doing it ourselves.
This code seems to do exactly the same as ttydisc_rint_simple() does
nowadays. Just remove it.

Obtained from:	//depot/user/ed/newcons/sys/dev/syscons/syscons.c
2009-09-18 15:39:09 +00:00
Xin LI
7ec7f6d5ed Make use of the more flexable device hints by adding a new field,
vesa_mode to specify VESA mode, as suggested by jhb@.
2009-09-12 00:12:47 +00:00
Xin LI
493d6f54bc Extend the usage of sc(4)'s hint variable 'flag'. Bit 0x80 now means
"set vesa mode" and higher 16bits of the flag would be the desired mode.

One can now set, for instance, hint.sc.0.flags=0x01680180, which means
that the system should set VESA mode 0x168 upon boot.

Submitted by:	paradox <ddkprog yahoo com>, swell k at gmail.com with
		some minor changes.
2009-09-11 02:07:24 +00:00
Ed Schouten
c5e30cc02b Last minute TTY API change: remove mutex argument from tty_alloc().
I don't want people to override the mutex when allocating a TTY. It has
to be there, to keep drivers like syscons happy. So I'm creating a
tty_alloc_mutex() which can be used in those cases. tty_alloc_mutex()
should eventually be removed.

The advantage of this approach, is that we can just remove a function,
without breaking the regular API in the future.
2009-05-29 06:41:23 +00:00
Ed Schouten
983d12f39b Turn consolectl into a simple device node, not a TTY.
Apart from the 16 virtual terminals, Syscons allocates two device nodes
that should not really be TTYs, even though they are. One of them is
consolectl. In RELENG_7 and before, these device nodes are used in
single user mode. After I simplified input path, we only use this device
node to call ioctl() on (moused, Xorg, vidcontrol).

When you call ioctl() on consolectl, it will behave the same as being
called on the first window.
2009-05-15 14:30:37 +00:00
Maksim Yevmenkin
af60af2dc0 Remove obsolete/bogus layering.
Reviewed by:	freebsd-current@, freebsd-hackers@
MFC after:	1 week
2009-04-09 18:22:51 +00:00
Ed Schouten
630b9bf23f Make a 1:1 mapping between syscons stats and terminal emulators.
After I imported libteken into the source tree, I noticed syscons didn't
store the cursor position inside the terminal emulator, but inside the
virtual terminal stat. This is not very useful, because when you
implement more complex forms of line wrapping, you need to keep track of
more state than just the cursor position.

Because the kernel messages didn't share the same terminal emulator as
ttyv0, this caused a lot of strange things, like kernel messages being
misplaced and a missing notification to resize the terminal emulator for
kernel messages never to be resized when using vidcontrol.

This patch just removes kernel_console_ts and adds a special parameter
to te_puts to determine whether messages should be printed using regular
colors or the ones for kernel messages.

Reported by:	ache
Tested by:	nyan, garga (older version)
2009-03-10 11:28:54 +00:00
Ed Schouten
8ddd1f723d Don't call into the TTY layer when inside kdb.
We should just leave the underlying TTY objects alone when scrolling
around in KDB. It should be handled by Syscons exclusively.

Reported by:	pluknet gmail com
2009-03-09 19:46:19 +00:00
Ed Schouten
b4b1c5169d Replace syscons terminal renderer by a new renderer that uses libteken.
Some time ago I started working on a library called libteken, which is
terminal emulator. It does not buffer any screen contents, but only
keeps terminal state, such as cursor position, attributes, etc. It
should implement all escape sequences that are implemented by the
cons25 terminal emulator, but also a fair amount of sequences that are
present in VT100 and xterm.

A lot of random notes, which could be of interest to users/developers:

- Even though I'm leaving the terminal type set to `cons25', users can
  do experiments with placing `xterm-color' in /etc/ttys. Because we
  only implement a subset of features of xterm, this may cause
  artifacts. We should consider extending libteken, because in my
  opinion xterm is the way to go. Some missing features:

  - Keypad application mode (DECKPAM)
  - Character sets (SCS)

- libteken is filled with a fair amount of assertions, but unfortunately
  we cannot go into the debugger anymore if we fail them. I've done
  development of this library almost entirely in userspace. In
  sys/dev/syscons/teken there are two applications that can be helpful
  when debugging the code:

  - teken_demo: a terminal emulator that can be started from a regular
    xterm that emulates a terminal using libteken. This application can
    be very useful to debug any rendering issues.

  - teken_stress: a stress testing application that emulates random
    terminal output. libteken has literally survived multiple terabytes
    of random input.

- libteken also includes support for UTF-8, but unfortunately our input
  layer and font renderer don't support this. If users want to
  experiment with UTF-8 support, they can enable `TEKEN_UTF8' in
  teken.h. If you recompile your kernel or the teken_demo application,
  you can hold some nice experiments.

- I've left PC98 the way it is right now. The PC98 platform has a custom
  syscons renderer, which supports some form of localised input. Maybe
  we should port PC98 to libteken by the time syscons supports UTF-8?

- I've removed the `dumb' terminal emulator. It has been broken for
  years. It hasn't survived the `struct proc' -> `struct thread'
  conversion.

- To prevent confusion among people that want to hack on libteken:
  unlike syscons, the state machines that parse the escape sequences are
  machine generated. This means that if you want to add new escape
  sequences, you have to add an entry to the `sequences' file. This will
  cause new entries to be added to `teken_state.h'.

- Any rendering artifacts that didn't occur prior to this commit are by
  accident. They should be reported to me, so I can fix them.

Discussed on:	current@, hackers@
Discussed with:	philip (at 25C3)
2009-01-01 13:26:53 +00:00
Maksim Yevmenkin
8fc061164d Undo revision 185013 until better solution is found.
Pointed out by:	bde
2008-11-17 20:33:13 +00:00