evbarm/plcom(4): Note ttylock in comment, not tty_lock.

evbarm/plcom(4): Sync some recent changes from com(4).

- Nix quirky `integrate' macro.
- Omit needless spltty in plcomstart.
- Comment on lock order.
- Update confusing comment about hangup delay.
- Add include guards.

Add support for FIFOs and hardware flow-control to plcom driver.
Add a PLCOM_TYPE_GENERIC_UART variant to match SBSA requirements.

ddb/db_active.h: New home for extern db_active.

This can be included unconditionally, and db_active can then be
queried unconditionally; if DDB is not in the kernel, then db_active
is a constant zero. Reduces need for #include opt_ddb.h, #ifdef DDB.

malloc -> kmem

- microtime -> microuptime
- avoid kpause with timeo=0

plcom: speed up close with HUPCL set

Instead of incurring a 1s penalty on close of a plcom device with HUPCL set,
defer the sleep until the next open, and only sleep if necessary.

remove superfluous parentheses in PREAD4/PWRITE4 macros

plcom_common_putc: do not wait for FIFO to train after writing data

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.

Add cn_halt function, disable interrupts when halting

Don't busy wait for a character in plcom_common_getc, but instead
return -1 if there are no characters available.

Fixes WSDISPLAY_MULTICONS for RaspberryPI and GENERIC.

Thanks to jmcneill@ for the hint

Trailing whitespace

Fix blank line printed at attach on ACPI

Don't write FBRD/IBRD if ref clk frequency is unknown

If rate or frequency are unspecified, assume "use firmware configuration" for clocks

branches: 1.53.2; 1.53.4;
Fix the "wait for any pending transmission to finish" - doesn't really
matter at the moment as the fifo is disabled.

MD rnd.h cleanups. Please let me know if I broke anything!

branches: 1.51.2;
centralize the call unit / dialout macros

Merge tls-earlyentropy branch into HEAD.

Add d_discard to all struct cdevsw instances I could find.

All have been set to "nodiscard"; some should get a real implementation.

branches: 1.48.2;
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.

Sprinkle __unused.

Whitespace

branches: 1.45.4;
For a polled console incoming characters are buffered on output.
The buffer is never passed to the regular tty routines and can
survive from early boot to halt where it is read by the "press
any continue to reboot" loops.
As a workaround, just kill the read-ahead buffer when switching
from and to polled mode.

fix build for KGDB

Fix #if 0'ed code.

From chuq

branches: 1.42.2;
Backout previous - it breaks rpi console for me and jak.

Improve support for transmit fifo support for plcom.

As Nick, Michiel and I concluded this driver needs a big overhaul since its
logic is modelled on the standard com.c driver which doesn't have the plcom's
treshold interrupt at al.

On Nicks request, the HW FIFO support hasn't been enabled by default on the
RPi though.

Tested with the RPi.

Add support for the PL011 to plcom. Pull across a bunch of fixes from
com(4) while I'm here and do some other tidyup.

Tested on a RaspberryPi.

PL010 not tested.

Fix locking botch introduced in 1.36.

device_t/softc split
struct device * -> device_t
struct cfdata * -> cfdata_t

DOH. Replace a line that got accidently deleted in the last commit.

Replace the simple_lock with a kmutex_t. Update the locking to match
com(4) in the few places it didn't already.

Rename register values. No functional change - same code before and after.

Existing names are prefixed with PL01X_ where they're common between the
PL010 and the PL011. The PL010_/PL011_ prefixes are added where they're
found only on the respective chips.

avoid warning with options PLCOM_DEBUG for INTEGRATOR.

branches: 1.33.2;
Entropy-pool implementation move and cleanup.

1) Move core entropy-pool code and source/sink/sample management code
to sys/kern from sys/dev.

2) Remove use of NRND as test for presence of entropy-pool code throughout
source tree.

3) Remove use of RND_ENABLED in device drivers as microoptimization to
avoid expensive operations on disabled entropy sources; make the
rnd_add calls do this directly so all callers benefit.

4) Fix bug in recent rnd_add_data()/rnd_add_uint32() changes that might
have lead to slight entropy overestimation for some sources.

5) Add new source types for environmental sensors, power sensors, VM
system events, and skew between clocks, with a sample implementation
for each.

ok releng to go in before the branch due to the difficulty of later
pullup (widespread #ifdef removal and moved files). Tested with release
builds on amd64 and evbarm and live testing on amd64.

branches: 1.32.4; 1.32.8;
Rename ttymalloc() to tty_alloc(), and ttyfree() to tty_free() for
consistency. Remove some unnecessary malloc.h inclusions as well.

branches: 1.31.4; 1.31.6;
Simplify the device-activation hook. Move some of the device
deactivation to the detachment routine, where it belongs.

Use lwp_getpcb() on ARM (and acorn26/32), clean from struct user usage.

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: 1.28.4; 1.28.10;
use device_lookup_private to get softc

branches: 1.27.2; 1.27.4;
Remove clause 3 and 4 from TNF licenses

branches: 1.26.2;
Make ntp, pmc, reboot, sysarch, time syscalls MPSAFE.

branches: 1.25.6; 1.25.8;
Make compile.

branches: 1.24.6;
- Factor out too many copies of the same bit of tty code.
- Fix another tty signalling/wakeup problem.

branches: 1.23.2;
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.

branches: 1.22.6; 1.22.8; 1.22.10; 1.22.14;
Remove a spurious brace.

Merge some of the less invasive changes from the vmlocking branch:

- kthread, callout, devsw API changes
- select()/poll() improvements
- miscellaneous MT safety improvements

branches: 1.20.2; 1.20.4; 1.20.10;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

branches: 1.19.4;
More from Matt Fleming:

Adapt to KAUTH_DEVICE_TTY_PRIVSET and KAUTH_DEVICE_TTY_OPEN.

Adapt MD code to KAUTH_DEVICE_TTY_OPEN. Patch from Matt Fleming, thanks!

branches: 1.17.4; 1.17.6;
Use the LWP cached credentials where sane.

integrate kauth.

Use device_unit().

branches: 1.14.2; 1.14.4; 1.14.6;
Use device_is_active() rather than testing dv_flags for DVF_ACTIVE
directly.

branches: 1.13.2; 1.13.4; 1.13.6;
remove the COM_MPLOCK option. always include the spinlock in the softc
and always call the simple_* locking functions. the locking functions
are compiled out if they are not needed anyway, so a separate option
for this doesn't gain anything.

this also fixes the serial console on my alpha ES40 (which doesn't make much
sense since the com driver should still be under the big lock on alpha,
but whatever).

merge ktrace-lwp.

Change the driver open function's conditional for overriding exclusive tty
use from checking the proc's uid to suser(9), and account for the use of
privileges. Noted by David Holland in PR kern/31126.

branches: 1.10.2;
Fix shaddowed declarations of cn_trapped.

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.

__KERNEL_RCSID()

branches: 1.7.2;
Make sure to include opt_foo.h if a defflag option FOO is used.

Initialize the two new members of "struct consdev" to NULL so that
this file compiles again.

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

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.

branches: 1.3.4;
Convert ioctl code to use EPASSTHROUGH instead of -1 or ENOTTY for
indicating an unhandled "command". ERESTART is -1, which can lead to
confusion. ERESTART has been moved to -3 and EPASSTHROUGH has been
placed at -4. No ioctl code should now return -1 anywhere. The
ioctl() system call is now properly restartable.

branches: 1.2.2;
- pull in opt_kgdb.h where necessary
- replace opt_kgdb_machdep.h with opt_kgdb.h
- defparam opt_kgdb.h:
KGDB_DEV KGDB_DEVNAME KGDB_DEVADDR KGDB_DEVRATE KGDB_DEVMODE
- move from opt_ddbparam.h to opt_ddb.h:
DDB_FROMCONSOLE DDB_ONPANIC DDB_HISTORY_SIZE DDB_BREAK_CHAR SYMTAB_SPACE
- replace KGDBDEV with KGDB_DEV
- replace KGDBADDR with KGDB_DEVADDR
- replace KGDBMODE with KGDB_DEVMODE
- replace KGDBRATE with KGDB_DEVRATE
- use `9600' instead of `0x2580' for 9600 baud rate
- use correct quotes for options KGDB_DEVNAME="\"com\""
- use correct quotes for options KGDB_DEV="17*256+0"
- remove unnecessary dependancy on Makefile for kgdb_stub.o
- minor whitespace cleanup

branches: 1.1.2;
Support for the PrimeCell PL010 UART. Similar in behaviour to
the normal com driver, but with competely different bit and register
assignments.

triple "r" typos, mainly s/interrrupt/interrupt/ in comments and one definition.

evbarm/plcom(4): Sync some recent changes from com(4).

- Nix quirky `integrate' macro.
- Omit needless spltty in plcomstart.
- Comment on lock order.
- Update confusing comment about hangup delay.
- Add include guards.

Add support for FIFOs and hardware flow-control to plcom driver.
Add a PLCOM_TYPE_GENERIC_UART variant to match SBSA requirements.

s/recive/receive/ in comment.

branches: 1.5.38;
Add the ifls register.

branches: 1.4.2;
Add support for the PL011 to plcom. Pull across a bunch of fixes from
com(4) while I'm here and do some other tidyup.

Tested on a RaspberryPi.

PL010 not tested.

Rename register values. No functional change - same code before and after.

Existing names are prefixed with PL01X_ where they're common between the
PL010 and the PL011. The PL010_/PL011_ prefixes are added where they're
found only on the respective chips.

don't mix #define<TAB> and #define<SPACE> in a file.

branches: 1.1.2; 1.1.4; 1.1.160; 1.1.164; 1.1.166;
Support for the PrimeCell PL010 UART. Similar in behaviour to
the normal com driver, but with competely different bit and register
assignments.

evbarm/plcom(4): Sync some recent changes from com(4).

- Nix quirky `integrate' macro.
- Omit needless spltty in plcomstart.
- Comment on lock order.
- Update confusing comment about hangup delay.
- Add include guards.

Add support for FIFOs and hardware flow-control to plcom driver.
Add a PLCOM_TYPE_GENERIC_UART variant to match SBSA requirements.

plcom: speed up close with HUPCL set

Instead of incurring a 1s penalty on close of a plcom device with HUPCL set,
defer the sleep until the next open, and only sleep if necessary.

G/C unused struct

MD rnd.h cleanups. Please let me know if I broke anything!

branches: 1.15.6;
No need to include sys/simplelock.h here.

branches: 1.14.4;
Fix prototype

branches: 1.13.2;
Backout previous - it breaks rpi console for me and jak.

Improve support for transmit fifo support for plcom.

As Nick, Michiel and I concluded this driver needs a big overhaul since its
logic is modelled on the standard com.c driver which doesn't have the plcom's
treshold interrupt at al.

On Nicks request, the HW FIFO support hasn't been enabled by default on the
RPi though.

Tested with the RPi.

Add support for the PL011 to plcom. Pull across a bunch of fixes from
com(4) while I'm here and do some other tidyup.

Tested on a RaspberryPi.

PL010 not tested.

device_t/softc split
struct device * -> device_t
struct cfdata * -> cfdata_t

Replace the simple_lock with a kmutex_t. Update the locking to match
com(4) in the few places it didn't already.

branches: 1.8.2;
Entropy-pool implementation move and cleanup.

1) Move core entropy-pool code and source/sink/sample management code
to sys/kern from sys/dev.

2) Remove use of NRND as test for presence of entropy-pool code throughout
source tree.

3) Remove use of RND_ENABLED in device drivers as microoptimization to
avoid expensive operations on disabled entropy sources; make the
rnd_add calls do this directly so all callers benefit.

4) Fix bug in recent rnd_add_data()/rnd_add_uint32() changes that might
have lead to slight entropy overestimation for some sources.

5) Add new source types for environmental sensors, power sensors, VM
system events, and skew between clocks, with a sample implementation
for each.

ok releng to go in before the branch due to the difficulty of later
pullup (widespread #ifdef removal and moved files). Tested with release
builds on amd64 and evbarm and live testing on amd64.

branches: 1.7.2;
First step of random number subsystem rework described in
<20111022023242.BA26F14A158@mail.netbsd.org>. This change includes
the following:

An initial cleanup and minor reorganization of the entropy pool
code in sys/dev/rnd.c and sys/dev/rndpool.c. Several bugs are
fixed. Some effort is made to accumulate entropy more quickly at
boot time.

A generic interface, "rndsink", is added, for stream generators to
request that they be re-keyed with good quality entropy from the pool
as soon as it is available.

The arc4random()/arc4randbytes() implementation in libkern is
adjusted to use the rndsink interface for rekeying, which helps
address the problem of low-quality keys at boot time.

An implementation of the FIPS 140-2 statistical tests for random
number generator quality is provided (libkern/rngtest.c). This
is based on Greg Rose's implementation from Qualcomm.

A new random stream generator, nist_ctr_drbg, is provided. It is
based on an implementation of the NIST SP800-90 CTR_DRBG by
Henric Jungheim. This generator users AES in a modified counter
mode to generate a backtracking-resistant random stream.

An abstraction layer, "cprng", is provided for in-kernel consumers
of randomness. The arc4random/arc4randbytes API is deprecated for
in-kernel use. It is replaced by "cprng_strong". The current
cprng_fast implementation wraps the existing arc4random
implementation. The current cprng_strong implementation wraps the
new CTR_DRBG implementation. Both interfaces are rekeyed from
the entropy pool automatically at intervals justifiable from best
current cryptographic practice.

In some quick tests, cprng_fast() is about the same speed as
the old arc4randbytes(), and cprng_strong() is about 20% faster
than rnd_extract_data(). Performance is expected to improve.

The AES code in src/crypto/rijndael is no longer an optional
kernel component, as it is required by cprng_strong, which is
not an optional kernel component.

The entropy pool output is subjected to the rngtest tests at
startup time; if it fails, the system will reboot. There is
approximately a 3/10000 chance of a false positive from these
tests. Entropy pool _input_ from hardware random numbers is
subjected to the rngtest tests at attach time, as well as the
FIPS continuous-output test, to detect bad or stuck hardware
RNGs; if any are detected, they are detached, but the system
continues to run.

A problem with rndctl(8) is fixed -- datastructures with
pointers in arrays are no longer passed to userspace (this
was not a security problem, but rather a major issue for
compat32). A new kernel will require a new rndctl.

The sysctl kern.arandom() and kern.urandom() nodes are hooked
up to the new generators, but the /dev/*random pseudodevices
are not, yet.

Manual pages for the new kernel interfaces are forthcoming.

branches: 1.6.44;
Make compile.

branches: 1.5.2; 1.5.8;
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: 1.4.6; 1.4.10;
Generic soft interrupts are mandatory.

branches: 1.3.20; 1.3.28;
Remove another instance of the macro triplet SET/CLR/ISSET, now
found in <sys/types.h>.

branches: 1.2.4; 1.2.6; 1.2.8; 1.2.10;
remove the COM_MPLOCK option. always include the spinlock in the softc
and always call the simple_* locking functions. the locking functions
are compiled out if they are not needed anyway, so a separate option
for this doesn't gain anything.

this also fixes the serial console on my alpha ES40 (which doesn't make much
sense since the com driver should still be under the big lock on alpha,
but whatever).

branches: 1.1.2; 1.1.4; 1.1.36;
Support for the PrimeCell PL010 UART. Similar in behaviour to
the normal com driver, but with competely different bit and register
assignments.

branches: 1.1.2; 1.1.4;
Register definitions for the v360 PCI-localbus bridge, as used
on the Integrator/AP.