world/kernel: Use the rounddown() macro in various places.

Tested-by: zrj

kernel - Refactor tty_token, fix SMP performance issues

* Remove most uses of tty_token in favor of per-tty tp->t_token.
This is particularly important for removing bottlenecks related to PTYs,

kernel - Refactor tty_token, fix SMP performance issues

* Remove most uses of tty_token in favor of per-tty tp->t_token.
This is particularly important for removing bottlenecks related to PTYs,
which are used all over the place. tty_token remains in a few places
managing overall registration and global list manipulation.

* tty structures are now required to be persistent. Implement a sepearate
ttyinit() function. Continue to allow ttyregister() and ttyunregister()
calls, but these no longer presume destruction of the structure.

* Refactor ttymalloc() to take a **tty pointer and interlock allocations.
Allocations are intended to be one-time. ttymalloc() only requires the
tty_token for initial allocations.

* Remove all critical section use that was combined with tty_token and
tp->t_token. Leave only the tokens. The critical sections were
hold-overs going all the way back to pre-SMP days.

* syscons now gets its own token, vga_token. The ISA VGA code and
the framebuffer code also now use this token instead of tty_token.

* The keyboard subsystem now uses kbd_token instead of tty_token.

* A few remaining serial-like devices (snp, nmdm) also get their own
tokens, as well as use the now required tp->t_token.

* Remove use of tty_token in the session management code. This fixes
a niggling performance path since sessions almost universally go
hand-in-hand with fork/exec/exit sequences. Instead we use the
already-existing per-hash session token.

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i386 removal, part 35/x: Remove the i386 specific vesa(4) code.

Clean up vga(4) too.

add file pointer to dev_d*() functions

kernel: Use DEVMETHOD_END in the drivers.

Initial import of binutils 2.22 on the new vendor branch

Future versions of binutils will also reside on this branch rather
than continuing to create new binutils branches for each new version.

AMD64 - Refactor uio_resid and size_t assumptions.

* uio_resid changed from int to size_t (size_t == unsigned long equivalent).

* size_t assumptions in most kernel code has been refactored to opera

AMD64 - Refactor uio_resid and size_t assumptions.

* uio_resid changed from int to size_t (size_t == unsigned long equivalent).

* size_t assumptions in most kernel code has been refactored to operate in a
64 bit environment.

* In addition, the 2G limitation for VM related system calls such as mmap()
has been removed in 32 bit environments. Note however that because
read() and write() return ssize_t, these functions are still limited
to a 2G byte count in 32 bit environments.

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DEVFS - (temporarily) fix LINT kernel build

Fix building LINT by removing a stray dev_ops_add in fb and
temporarily removing vinum from the build.

Remove a lot of old, mummified code whose sole purpose was probing and
initialization of ye olde mono adapter/color adapter combination.

Instead of this, generally assume that we are dealing with on

Remove a lot of old, mummified code whose sole purpose was probing and
initialization of ye olde mono adapter/color adapter combination.

Instead of this, generally assume that we are dealing with one VGA
card.

After this commit, the VGA code is still a mess, but a slightly
smaller one. :)

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Revamp SYSINIT ordering. Relabel sysinit IDs (SI_* in sys/kernel.h) to
make them less confusing, particularly with regard to the relative order
init routines are called in.

Reorder many sysinits.

Revamp SYSINIT ordering. Relabel sysinit IDs (SI_* in sys/kernel.h) to
make them less confusing, particularly with regard to the relative order
init routines are called in.

Reorder many sysinits. Reorder the SMP and CLOCK code to bring all the
cpus up far earlier in the boot sequence and to make the full threading and
clocking subsystems available for device config.

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Rename printf -> kprintf in sys/ and add some defines where necessary
(files which are used in userland, too).

Change the kernel dev_t, representing a pointer to a specinfo structure,
to cdev_t. Change struct specinfo to struct cdev. The name 'cdev' was taken
from FreeBSD. Remove the dev_t shim for the ker

Change the kernel dev_t, representing a pointer to a specinfo structure,
to cdev_t. Change struct specinfo to struct cdev. The name 'cdev' was taken
from FreeBSD. Remove the dev_t shim for the kernel.

This commit generally removes the overloading of 'dev_t' between userland and
the kernel.

Also fix a bug in libkvm where a kernel dev_t (now cdev_t) was not being
properly converted to a userland dev_t.

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Rename malloc->kmalloc, free->kfree, and realloc->krealloc. Pass 1

MASSIVE reorganization of the device operations vector. Change cdevsw
to dev_ops. dev_ops is a syslink-compatible operations vector structure
similar to the vop_ops structure used by vnodes.

Remov

MASSIVE reorganization of the device operations vector. Change cdevsw
to dev_ops. dev_ops is a syslink-compatible operations vector structure
similar to the vop_ops structure used by vnodes.

Remove a huge number of instances where a thread pointer is still being
passed as an argument to various device ops and other related routines.
The device OPEN and IOCTL calls now take a ucred instead of a thread pointer,
and the CLOSE call no longer takes a thread pointer.

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Fix style(9) issue: move * to the line specifying the function type.

Use M_ZERO instead of explicit bzero()s.

spl->critical section conversion

Remove PC98 support.

Device layer rollup commit.

* cdevsw_add() is now required. cdevsw_add() and cdevsw_remove() may specify
a mask/match indicating the range of supported minor numbers. Multiple
cdevsw_add()'s u

Device layer rollup commit.

* cdevsw_add() is now required. cdevsw_add() and cdevsw_remove() may specify
a mask/match indicating the range of supported minor numbers. Multiple
cdevsw_add()'s using the same major number, but distinctly different
ranges, may be issued. All devices that failed to call cdevsw_add() before
now do.

* cdevsw_remove() now automatically marks all devices within its supported
range as being destroyed.

* vnode->v_rdev is no longer resolved when the vnode is created. Instead,
only v_udev (a newly added field) is resolved. v_rdev is resolved when
the vnode is opened and cleared on the last close.

* A great deal of code was making rather dubious assumptions with regards
to the validity of devices associated with vnodes, primarily due to
the persistence of a device structure due to being indexed by (major, minor)
instead of by (cdevsw, major, minor). In particular, if you run a program
which connects to a USB device and then you pull the USB device and plug
it back in, the vnode subsystem will continue to believe that the device
is open when, in fact, it isn't (because it was destroyed and recreated).

In particular, note that all the VFS mount procedures now check devices
via v_udev instead of v_rdev prior to calling VOP_OPEN(), since v_rdev
is NULL prior to the first open.

* The disk layer's device interaction has been rewritten. The disk layer
(i.e. the slice and disklabel management layer) no longer overloads
its data onto the device structure representing the underlying physical
disk. Instead, the disk layer uses the new cdevsw_add() functionality
to register its own cdevsw using the underlying device's major number,
and simply does NOT register the underlying device's cdevsw. No
confusion is created because the device hash is now based on
(cdevsw,major,minor) rather then (major,minor).

NOTE: This also means that underlying raw disk devices may use the entire
device minor number instead of having to reserve the bits used by the disk
layer, and also means that can we (theoretically) stack a fully
disklabel-supported 'disk' on top of any block device.

* The new reference counting scheme prevents this by associating a device
with a cdevsw and disconnecting the device from its cdevsw when the cdevsw
is removed. Additionally, all udev2dev() lookups run through the cdevsw
mask/match and only successfully find devices still associated with an
active cdevsw.

* Major work on MFS: MFS no longer shortcuts vnode and device creation. It
now creates a real vnode and a real device and implements real open and
close VOPs. Additionally, due to the disk layer changes, MFS is no longer
limited to 255 mounts. The new limit is 16 million. Since MFS creates a
real device node, mount_mfs will now create a real /dev/mfs<PID> device
that can be read from userland (e.g. so you can dump an MFS filesystem).

* BUF AND DEVICE STRATEGY changes. The struct buf contains a b_dev field.
In order to properly handle stacked devices we now require that the b_dev
field be initialized before the device strategy routine is called. This
required some additional work in various VFS implementations. To enforce
this requirement, biodone() now sets b_dev to NODEV. The new disk layer
will adjust b_dev before forwarding a request to the actual physical
device.

* A bug in the ISO CD boot sequence which resulted in a panic has been fixed.

Testing by: lots of people, but David Rhodus found the most aggregious bugs.

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device switch 1/many: Remove d_autoq, add d_clone (where d_autoq was).

d_autoq was used to allow the device port dispatch to mix old-style synchronous
calls with new style messaging calls within a p

device switch 1/many: Remove d_autoq, add d_clone (where d_autoq was).

d_autoq was used to allow the device port dispatch to mix old-style synchronous
calls with new style messaging calls within a particular device. It was never
used for that purpose.

d_clone will be more fully implemented as work continues. We are going to
install d_port in the dev_t (struct specinfo) structure itself and d_clone
will be needed to allow devices to 'revector' the port on a minor-number
by minor-number basis, in particular allowing minor numbers to be directly
dispatched to distinct threads. This is something we will be needing later
on.

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Fully synchronize sys/boot from FreeBSD-5.x, but add / to the module path
so /kernel will be found and loaded instead of /boot/kernel. This will
give us all the capabilities of the FreeBSD-5 boot co

Fully synchronize sys/boot from FreeBSD-5.x, but add / to the module path
so /kernel will be found and loaded instead of /boot/kernel. This will
give us all the capabilities of the FreeBSD-5 boot code including AMD64 and
ELF64 support.

As part of this work, rather then try to adjust ufs/fs.h and friends to get
UFS2 info I instead copied the fs.h and friends from FreeBSD-5 into the
sys/boot subtree

Additionally, import Peter Wemm's linker set improvements from FreeBSD-5.x.
They happen to be compatible with GCC 2.95.x and it allows very few changes
to be made to the boot code.

Additionally import a number of other elements from FreeBSD-5 including
sys/diskmbr.h separation.

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kernel tree reorganization stage 1: Major cvs repository work (not logged as
commits) plus a major reworking of the #include's to accomodate the
relocations.

* CVS repository files manually move

kernel tree reorganization stage 1: Major cvs repository work (not logged as
commits) plus a major reworking of the #include's to accomodate the
relocations.

* CVS repository files manually moved. Old directories left intact
and empty (temporary).

* Reorganize all filesystems into vfs/, most devices into dev/,
sub-divide devices by function.

* Begin to move device-specific architecture files to the device
subdirs rather then throwing them all into, e.g. i386/include

* Reorganize files related to system busses, placing the related code
in a new bus/ directory. Also move cam to bus/cam though this may
not have been the best idea in retrospect.

* Reorganize emulation code and place it in a new emulation/ directory.

* Remove the -I- compiler option in order to allow #include file
localization, rename all config generated X.h files to use_X.h to
clean up the conflicts.

* Remove /usr/src/include (or /usr/include) dependancies during the
kernel build, beyond what is normally needed to compile helper
programs.

* Make config create 'machine' softlinks for architecture specific
directories outside of the standard <arch>/include.

* Bump the config rev.

WARNING! after this commit /usr/include and /usr/src/sys/compile/*
should be regenerated from scratch.

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DEV messaging stage 2/4: In this stage all DEV commands are now being
funneled through the message port for action by the port's beginmsg function.
CONSOLE and DISK device shims replace the port with

DEV messaging stage 2/4: In this stage all DEV commands are now being
funneled through the message port for action by the port's beginmsg function.
CONSOLE and DISK device shims replace the port with their own and then
forward to the original. FB (Frame Buffer) shims supposedly do the same
thing but I haven't been able to test it. I don't expect instability
in mainline code but there might be easy-to-fix, and some drivers still need
to be converted. See primarily: kern/kern_device.c (new dev_*() functions and
inherits cdevsw code from kern/kern_conf.c), sys/device.h, and kern/subr_disk.c
for the high points.

In this stage all DEV messages are still acted upon synchronously in the
context of the caller. We cannot create a separate handler thread until
the copyin's (primarily in ioctl functions) are made thread-aware.

Note that the messaging shims are going to look rather messy in these early
days but as more subsystems are converted over we will begin to use
pre-initialized messages and message forwarding to avoid having to constantly
rebuild messages prior to use.

Note that DEV itself is a mess oweing to its 4.x roots and will be cleaned
up in subsequent passes. e.g. the way sub-devices inherit the main device's
cdevsw was always a bad hack and it still is, and several functions
(mmap, kqfilter, psize, poll) return results rather then error codes, which
will be fixed since now we have a message to store the result in :-)

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LINT build test. Aggregated source code adjustments to bring most of the
rest of the kernel source up to date, using the LINT build.

DEV messaging stage 1/4: Rearrange struct cdevsw and add a message port
and auto-queueing mask. The mask will tell us which message functions
can be safely queued to another thread and which still n

DEV messaging stage 1/4: Rearrange struct cdevsw and add a message port
and auto-queueing mask. The mask will tell us which message functions
can be safely queued to another thread and which still need to run in the
context of the caller. Primary configuration fields (name, cmaj, flags,
port, autoq mask) are now at the head of the structure. Function vectors,
which may eventually go away, are at the end. The port and autoq fields
are non-functional in this stage.

The old BDEV device major number support has also been removed from cdevsw,
and code has been added to translate the bootdev passed from the boot code
(the boot code has always passed the now defunct block device major numbers
and we obviously need to keep that compatibility intact).

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