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CVS log for src/sys/dev/serial/sio/sio.c

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Revision 1.44: download - view: text, markup, annotated - select for diffs
Wed Jul 23 16:39:33 2008 UTC (6 years, 1 month ago) by dillon
Branches: MAIN
CVS tags: HEAD, DragonFly_Preview
Diff to: previous 1.43: preferred, unified
Changes since revision 1.43: +2 -2 lines
Synchronize some of the machine-independant AMD64 bits.

Obtained-from: Jordan Gordeev <jgordeev@dir.bg>

Revision 1.43: download - view: text, markup, annotated - select for diffs
Thu Jun 5 18:06:32 2008 UTC (6 years, 2 months ago) by swildner
Branches: MAIN
CVS tags: DragonFly_RELEASE_2_0_Slip, DragonFly_RELEASE_2_0
Diff to: previous 1.42: preferred, unified
Changes since revision 1.42: +1 -1 lines
* Fix some cases where NULL was used but 0 was meant (and vice versa).

* Remove some bogus casts of NULL to (void *).

Revision 1.42: download - view: text, markup, annotated - select for diffs
Tue Oct 23 03:04:49 2007 UTC (6 years, 10 months ago) by y0netan1
Branches: MAIN
CVS tags: DragonFly_RELEASE_1_12_Slip, DragonFly_RELEASE_1_12
Diff to: previous 1.41: preferred, unified
Changes since revision 1.41: +1 -0 lines
Merge ACPI resource manager changes From FreeBSD:

acpi.c,v 1.158, acpivar.h,v 1.70
  Associate a device_t with an ACPI_HANDLE.  This make AcpiWalkNamespace more
  useful.  If ACPI-CA allowed null object handlers, we wouldn't need the
  placeholder function.

acpi.c,v 1.159-1.160 and others:
  Add support to ACPI to manage its own resources.  Previously, resource
  allocation was passed up to nexus.  Now, we probe sysresource objects and
  manage the resources they describe in a local rman pool.  This helps
  devices which attach/detach varying resources (like the _CST object) and
  module loads/unloads.  The allocation/release routines now check to see if
  the resource is described in a child sysresource object and if so,
  allocate from the local rman.  Sysresource objects add their resources to
  the pool and reserve them upon boot.  This means sysresources need to be
  probed before other ACPI devices.

  Changes include:
  * Add ordering to the child device probe.  The current order is:  system
  resource objects, embedded controllers, then everything else.
  * Make acpi_MatchHid take a handle instead of a device_t arg.
  * Replace acpi_{get,set}_resource with the generic equivalents.

acpi.c,v 1.175:
  Call device_identify routines after doing the namespace walk.  This is
  needed so that sysresource objects are created first to reserve all regions,
  then other devices can allocate from them.  Otherwise, acpi_timer (the only
  ACPI device with an identify routine), would allocate its resources from
  the nexus, causing the later sysresource reserve to fail.

  Debugging by:   Taku YAMAMOTO, Andrea Campi

And add ACPI attachment to some devices trying to obtain resources
from the ISA bus.

Revision 1.41: download - view: text, markup, annotated - select for diffs
Wed May 9 00:53:34 2007 UTC (7 years, 3 months ago) by dillon
Branches: MAIN
CVS tags: DragonFly_RELEASE_1_10_Slip, DragonFly_RELEASE_1_10
Diff to: previous 1.40: preferred, unified
Changes since revision 1.40: +0 -1 lines
Give the device major / minor numbers their own separate 32 bit fields
in the kernel.  Change dev_ops to use a RB tree to index major device
numbers and remove the 256 device major number limitation.

Build a dynamic major number assignment feature into dev_ops_add() and
adjust ASR (which already had a hand-rolled one), and MFS to use the
feature.  MFS at least does not require any filesystem visibility to
access its backing device.  Major devices numbers >= 256 are used for
dynamic assignment.

Retain filesystem compatibility for device numbers that fall within the
range that can be represented in UFS or struct stat (which is a single
32 bit field supporting 8 bit major numbers and 24 bit minor numbers).

Revision 1.40: download - view: text, markup, annotated - select for diffs
Mon May 7 05:21:40 2007 UTC (7 years, 3 months ago) by dillon
Branches: MAIN
Diff to: previous 1.39: preferred, unified
Changes since revision 1.39: +35 -24 lines
Changes to consdev - low level kernel console initialization.

The consdev API was calling make_dev() extremely early in the boot sequence,
but except for a little code in syscons didn't really need the abstraction
to operate the kernel console during boot.

Change the consdev API to no longer require the use the device abstraction
to operate.  This will allow the device ABI (cdev_t) to be converted to
use SYSREF.

Revision 1.39: download - view: text, markup, annotated - select for diffs
Thu Apr 12 18:35:09 2007 UTC (7 years, 4 months ago) by swildner
Branches: MAIN
Diff to: previous 1.38: preferred, unified
Changes since revision 1.38: +34 -85 lines
Ansify parameter declarations.

Revision 1.38: download - view: text, markup, annotated - select for diffs
Fri Dec 22 23:26:24 2006 UTC (7 years, 8 months ago) by swildner
Branches: MAIN
CVS tags: DragonFly_RELEASE_1_8_Slip, DragonFly_RELEASE_1_8
Diff to: previous 1.37: preferred, unified
Changes since revision 1.37: +34 -34 lines
Rename printf -> kprintf in sys/ and add some defines where necessary
(files which are used in userland, too).

Revision 1.37: download - view: text, markup, annotated - select for diffs
Tue Nov 7 18:50:06 2006 UTC (7 years, 9 months ago) by dillon
Branches: MAIN
Diff to: previous 1.36: preferred, unified
Changes since revision 1.36: +0 -1 lines
Remove system dependancies on <machine/ipl.h>.  Only architecture files
need it now.  SWI_* defines moved from the MD <machine/ipl.h> to the
MI <sys/interrupt.h> directory.

Revision 1.36: download - view: text, markup, annotated - select for diffs
Wed Oct 25 20:56:02 2006 UTC (7 years, 10 months ago) by dillon
Branches: MAIN
Diff to: previous 1.35: preferred, unified
Changes since revision 1.35: +0 -3 lines
Do a major clean-up of the BUSDMA architecture.  A large number of
essentially machine-independant drivers use the structures and definitions
in machine-dependant directories that are really machine-independant in
nature.

Split <machine/bus_dma.h> into machine-depdendant and machine-independant parts
and make the primary access run through <sys/bus_dma.h>.

Remove <machine/bus.h>, <machine/bus_memio.h> and <machine/bus_pio.h>.  The
optimizations related to bus_memio.h and bus_pio.h made a huge mess,
introduced machine-specific knowledge into essentially machine-independant
drivers, and required specific #include file orderings to do their job.
They may be reintroduced in some other form later on.

Move <machine/resource.h> to <sys/bus_resource.h>.  The contents of the file
is machine-independant or can be made a superset across many platforms.

Make <sys/bus.h> include <sys/bus_dma.h> and <sys/bus_resource.h> and
include <sys/bus.h> where necessary. Remove all #include's of
<machine/resource.h> and <machine/bus.h>.  That is, make the BUSDMA
infrastructure integral to I/O-mapped and memory-mapped accesses to devices
and remove a large chunk of machine-specific dependancies from drivers.
bus_if.h and device_if.h are now required to be present when using <sys/bus.h>.

Revision 1.35: download - view: text, markup, annotated - select for diffs
Sun Sep 10 01:26:37 2006 UTC (7 years, 11 months ago) by dillon
Branches: MAIN
Diff to: previous 1.34: preferred, unified
Changes since revision 1.34: +8 -8 lines
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.

Revision 1.34: download - view: text, markup, annotated - select for diffs
Sat Sep 9 19:34:46 2006 UTC (7 years, 11 months ago) by dillon
Branches: MAIN
Diff to: previous 1.33: preferred, unified
Changes since revision 1.33: +1 -1 lines
Rename the kernel NODEV to NOCDEV to avoid conflicts with the userland NODEV.

Revision 1.33: download - view: text, markup, annotated - select for diffs
Tue Sep 5 00:55:42 2006 UTC (7 years, 11 months ago) by dillon
Branches: MAIN
Diff to: previous 1.32: preferred, unified
Changes since revision 1.32: +4 -4 lines
Rename malloc->kmalloc, free->kfree, and realloc->krealloc.  Pass 1

Revision 1.32: download - view: text, markup, annotated - select for diffs
Fri Jul 28 02:17:38 2006 UTC (8 years, 1 month ago) by dillon
Branches: MAIN
Diff to: previous 1.31: preferred, unified
Changes since revision 1.31: +48 -56 lines
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.

Revision 1.31: download - view: text, markup, annotated - select for diffs
Thu Oct 13 00:02:42 2005 UTC (8 years, 10 months ago) by dillon
Branches: MAIN
CVS tags: DragonFly_RELEASE_1_6_Slip, DragonFly_RELEASE_1_6, DragonFly_RELEASE_1_4_Slip, DragonFly_RELEASE_1_4
Diff to: previous 1.30: preferred, unified
Changes since revision 1.30: +2 -2 lines
Major cleanup of the interrupt registration subsystem.

* Collapse the separate registrations in the kernel interrupt thread and
  i386 layers into a single machine-independant kernel interrupt thread layer
  in kern/kern_intr.c.  Get rid of the i386 layer's 'MUX' code entirely.

* Have the interrupt vector assembly code (icu_vector.s and apic_vector.s)
  call a machine-independant function in the kernel interrupt thread
  layer to figure out how to process an interrupt.

* Move a lot of assembly into the new C interrupt processing function.

* Add support for INTR_MPSAFE.  If a device driver registers an interrupt
  as being MPSAFE, the Big Giant Lock will not be obtained or required.

* Temporarily just schedule the ithread if a FAST interrupt cannot be executed
  due to its serializer being locked.

* Add LWKT serialization support for a non-blocking 'try' function.

* Get rid of ointhand2_t and adjust all old ISA code to use inthand2_t.

* Supply a frame pointer as a pointer rather then embedding it on th stack.

* Allow FAST and SLOW interrupts to be mixed on the same IRQ, though this
  will not necessarily result in optimal operation.

* Remove direct APIC/ICU vector calls from the apic/icu vector assembly code.
  Everything goes through the new routine in kern/kern_intr.c now.

* Add a new flag, INTR_NOPOLL.  Interrupts registered with the flag will
  not be polled by the upcoming emergency general interrupt polling
  sysctl (e.g. ATA cannot be safely polled due to the way ATA register
  access interferes with ATA DMA).

* Remove most of the distinction in the i386 assembly layers between FAST
  and SLOW interrupts (part 1/2).

* Revamp the interrupt name array returned to userland to list multiple
  drivers associated with the same IRQ.

Revision 1.30: download - view: text, markup, annotated - select for diffs
Wed Oct 12 17:35:55 2005 UTC (8 years, 10 months ago) by dillon
Branches: MAIN
Diff to: previous 1.29: preferred, unified
Changes since revision 1.29: +4 -4 lines
Remove the INTR_TYPE_* flags.  The interrupt type is no longer used to
figure out which spl*() set an interrupt belongs to, because, well, spl's
no longer exist.

Revision 1.29: download - view: text, markup, annotated - select for diffs
Sat Jul 16 17:07:21 2005 UTC (9 years, 1 month ago) by dillon
Branches: MAIN
Diff to: previous 1.28: preferred, unified
Changes since revision 1.28: +9 -3 lines
Add some missing crit_exit()'s.  The original code just assumed that the
SPL would be cleaned up by the caller, but the SPL->crit conversion really
requires that the routines be more self-contained.

Revision 1.28: download - view: text, markup, annotated - select for diffs
Thu Jun 16 21:12:41 2005 UTC (9 years, 2 months ago) by dillon
Branches: MAIN
Diff to: previous 1.27: preferred, unified
Changes since revision 1.27: +1 -1 lines
Remove all remaining SPL code.  Replace the mtd_cpl field in the machine
dependant thread structure and the CPL field in the interrupt stack frame
with dummies (so structural sizes do not change, yet).  Remove all interrupt
handler SPL mask and mask pointer code.  Remove all spl*() functions except
for splz().

Note that doreti uses a temporary CPL mask internally to accumulate a bitmap
of FAST interrupts which could not be executed due to not being able to get
the BGL.  This mask has no outside visibility.

Note that gd_fpending and gd_ipending still exist to support critical section
interrupt deferment.

Revision 1.27: download - view: text, markup, annotated - select for diffs
Fri Jun 10 15:29:17 2005 UTC (9 years, 2 months ago) by swildner
Branches: MAIN
Diff to: previous 1.26: preferred, unified
Changes since revision 1.26: +1 -1 lines
Remove unused variables.

Revision 1.26: download - view: text, markup, annotated - select for diffs
Wed Jun 8 08:25:50 2005 UTC (9 years, 2 months ago) by okumoto
Branches: MAIN
Diff to: previous 1.25: preferred, unified
Changes since revision 1.25: +32 -41 lines
Remove spl*() in src/sys/dev/serial/{cy,rc,rp,si,sio,stl,stli}
and replace them with critical sections.

Revision 1.25: download - view: text, markup, annotated - select for diffs
Wed Jun 1 17:43:45 2005 UTC (9 years, 3 months ago) by dillon
Branches: MAIN
Diff to: previous 1.24: preferred, unified
Changes since revision 1.24: +1 -1 lines
Implement a new cputimer infrastructure to allow us to support different
time bases.  This is in preparation for adding support for the ACPI timer
as the system's free-running counter instead of the i8254 timer 1 or timer 2.

Revision 1.24: download - view: text, markup, annotated - select for diffs
Tue May 24 20:59:04 2005 UTC (9 years, 3 months ago) by dillon
Branches: MAIN
Diff to: previous 1.23: preferred, unified
Changes since revision 1.23: +2 -2 lines
Get rid of bus_{disable,enable}_intr(), it wasn't generic enough for
our needs.

Implement some generic atomic.h functions to aid in the implementation of
a low level mutex.

Implement a generic low level sleep-mutex serializer, kern/lwkt_serialize.c.
The serializer is designed to be a replacement for SPL calls but may also
be used for other very low level work (e.g. lockmgr interlocks).

Add a serializer argument to BUS_SETUP_INTR().  When non-NULL, the interrupt
handler will no longer be protected by an SPL so e.g. spl*() will no
longer protect against that device's interrupts.

The IF queueing and dequeueing mechanisms may no longer depend on outside
SPL state because network driver interrupt handlers are no longer required to
enter splnet().  Use critical sections for the moment.  The IFQ and
IFF_OACTIVE interactions are not yet MP safe.

Revision 1.23: download - view: text, markup, annotated - select for diffs
Sat Apr 30 23:04:21 2005 UTC (9 years, 4 months ago) by swildner
Branches: MAIN
Diff to: previous 1.22: preferred, unified
Changes since revision 1.22: +0 -123 lines
Remove DEC Alpha support.

Revision 1.22: download - view: text, markup, annotated - select for diffs
Tue Feb 1 22:41:23 2005 UTC (9 years, 7 months ago) by dillon
Branches: MAIN
CVS tags: DragonFly_Stable, DragonFly_RELEASE_1_2_Slip, DragonFly_RELEASE_1_2
Diff to: previous 1.21: preferred, unified
Changes since revision 1.21: +1 -1 lines
Add a intrmask_t pointer to register_int() and register_swi(), and make
the interrupt thread loop set the spl for the duration of the call to the
handler.

Allow interrupt threads to be run with or without a critical section based
on the kern.int_use_crit_section sysctl.  The default is to conservatively
run with a critical section for now.

Turning this off will cause cpu usage in interrupts to be properly accounted
for by top, systat, and ps.

Revision 1.21: download - view: text, markup, annotated - select for diffs
Fri Nov 12 20:51:29 2004 UTC (9 years, 9 months ago) by dillon
Branches: MAIN
Diff to: previous 1.20: preferred, unified
Changes since revision 1.20: +3 -2 lines
Add a missing com_unlock() to the serial port drain test code.  This code
is necessary to detect non-existant serial ports on machines (such as the
eMachines laptop) which don't have any serial port hardware at all, but
the missing com_unlock() caused systems to crash in certain situations for
obvious reasons.

Many thanks to Glenn Johnson <glennpj@charter.net> for keeping on my back
about the issue and for testing the fix.  This should also fix the last of the
serial-port related bug reports stemming from the original 1.0A release.

Revision 1.20: download - view: text, markup, annotated - select for diffs
Sun Sep 19 02:05:54 2004 UTC (9 years, 11 months ago) by dillon
Branches: MAIN
CVS tags: DragonFly_Snap29Sep2004
Diff to: previous 1.19: preferred, unified
Changes since revision 1.19: +9 -4 lines
timeout/untimeout ==> callout_*

Revision 1.19: download - view: text, markup, annotated - select for diffs
Sat Sep 18 20:02:38 2004 UTC (9 years, 11 months ago) by dillon
Branches: MAIN
Diff to: previous 1.18: preferred, unified
Changes since revision 1.18: +1 -5 lines
malloc() M_NOWAIT -> M_WAITOK, plus remove bzero's in favor of M_ZERO.

Revision 1.18: download - view: text, markup, annotated - select for diffs
Sat Sep 18 19:54:28 2004 UTC (9 years, 11 months ago) by dillon
Branches: MAIN
Diff to: previous 1.17: preferred, unified
Changes since revision 1.17: +12 -7 lines
timeout/untimeout ==> callout_*

Revision 1.17: download - view: text, markup, annotated - select for diffs
Sat Jul 3 21:23:37 2004 UTC (10 years, 2 months ago) by dillon
Branches: MAIN
CVS tags: DragonFly_Snap13Sep2004, DragonFly_1_0_REL, DragonFly_1_0A_REL
Diff to: previous 1.16: preferred, unified
Changes since revision 1.16: +15 -0 lines
Make sure a serial port exists by determining whether it is possible to drain
its RX queue, before we turn on its interrupt or do other things.  If we can't
then the serial port is disabled.

This fixes drain lockups on laptops and newer desktops that occur when a
non-existant serial port is opened and allows us to ship a CD with a getty
on ttyd0 without locking up the system.

Revision 1.16: download - view: text, markup, annotated - select for diffs
Wed May 19 22:52:49 2004 UTC (10 years, 3 months ago) by dillon
Branches: MAIN
CVS tags: DragonFly_1_0_RC1
Diff to: previous 1.15: preferred, unified
Changes since revision 1.15: +12 -4 lines
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.

Revision 1.15: download - view: text, markup, annotated - select for diffs
Thu May 13 23:49:20 2004 UTC (10 years, 3 months ago) by dillon
Branches: MAIN
Diff to: previous 1.14: preferred, unified
Changes since revision 1.14: +1 -1 lines
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.

Revision 1.14: download - view: text, markup, annotated - select for diffs
Sat Feb 21 06:37:07 2004 UTC (10 years, 6 months ago) by dillon
Branches: MAIN
Diff to: previous 1.13: preferred, unified
Changes since revision 1.13: +1 -1 lines
Synchronize a bunch of things from FreeBSD-5 in preparation for the new
ACPICA driver support.

* Bring in a lot of new bus and pci DEV_METHODs from FreeBSD-5
* split apic.h into apicreg.h and apicio.h
* rename INTR_TYPE_FAST -> INTR_FAST and move the #define
* rename INTR_TYPE_EXCL -> INTR_EXCL and move the #define
* rename some PCIR_ registers and add additional macros from FreeBSD-5
* note: new pcib bus call, host_pcib_get_busno() imported.
* kern/subr_power.c no longer optional.

Other changes:

* machine/smp.h machine smp/smptests.h can now be #included unconditionally,
  and some APIC_IO vs SMP separation has been done as well.
* gd_acpi_id and gd_apic_id added to machine/globaldata.h prep for new
  ACPI code.

Despite all the changes, the generated code should be virtually the same.
These were mostly additions which the pre-existing code does not (yet) use.

Revision 1.13: download - view: text, markup, annotated - select for diffs
Fri Jan 30 05:42:15 2004 UTC (10 years, 7 months ago) by dillon
Branches: MAIN
Diff to: previous 1.12: preferred, unified
Changes since revision 1.12: +2 -4 lines
This commit represents a major revamping of the clock interrupt and timebase
infrastructure in DragonFly.

* Rip out the existing 8254 timer 0 code, and also disable the use of
  Timer 2 (which means that the PC speaker will no longer go beep).  Timer 0
  used to represent a periodic interrupt and a great deal of code was in
  place to attempt to obtain a timebase off of that periodic interrupt.

  Timer 0 is now used in software retriggerable one-shot mode to produce
  variable-delay interrupts.  A new hardware interrupt clock abstraction
  called SYSTIMERS has been introduced which allows threads to register
  periodic or one-shot interrupt/IPI callbacks at approximately 1uS
  granularity.

  Timer 2 is now set in continuous periodic mode with a period of 65536
  and provides the timebase for the system, abstracted to 32 bits.

  All the old platform-integrated hardclock() and statclock() code has
  been rewritten.  The old IPI forwarding code has been #if 0'd out and
  will soon be entirely removed (the systimer abstraction takes care of
  multi-cpu registrations now).  The architecture-specific clkintr() now
  simply calls an entry point into the systimer and provides a Timer 0
  reload and Timer 2 timebase function API.

* On both UP and SMP systems, cpus register systimer interrupts for the Hz
  interrupt, the stat interrupt, and the scheduler round-robin interrupt.
  The abstraction is carefully designed to allow multiple interrupts occuring
  at the same time to be processed in a single hardware interrupt.  While
  we currently use IPI's to distribute requested interrupts from other cpu's,
  the intent is to use the abstraction to take advantage of per-cpu timers
  when available (e.g. on the LAPIC) in the future.

  systimer interrupts run OUTSIDE THE MP LOCK.  Entry points may be called
  from the hard interrupt or via an IPI message (IPI messages have always
  run outside the MP lock).

* Rip out timecounters and disable alternative timecounter code for other
  time sources.  This is temporary.  Eventually other time sources, such as
  the TSC, will be reintegrated as independant, parallel-running entities.
  There will be no 'time switching' per-say, subsystems will be able to
  select which timebase they wish to use.  It is desireable to reintegrate
  at least the TSC to improve [get]{micro,nano}[up]time() performance.

  WARNING: PPS events may not work properly.  They were not removed, but
  they have not been retested with the new code either.

* Remove spl protection around [get]{micro,nano}[up]time() calls, they are
  now internally protected.

* Use uptime instead of realtime in certain CAM timeout tests

* Remove struct clockframe.  Use struct intrframe everywhere where clockframe
  used to be used.

* Replace most splstatclock() protections with crit_*() protections, because
  such protections must now also protect against IPI messaging interrupts.

* Add fields to the per-cpu globaldata structure to access timebase related
  information using only a critical section rather then a mutex.  However,
  the 8254 Timer 2 access code still uses spin locks.  More work needs to
  be done here, the 'realtime' correction is still done in a single global
  'struct timespec basetime' structure.

* Remove the CLKINTR_PENDING icu and apic interrupt hacks.

* Augment the IPI Messaging code to make an intrframe available to callbacks.

* Document 8254 timing modes in i386/sai/timerreg.h.  Note that at the
  moment we assume an 8254 instead of an 8253 as we are using TIMER_SWSTROBE
  mode.  This may or may not have to be changed to an 8253 mode.

* Integrate the NTP correction code into the new timebase subsystem.

* Separate boottime from basettime.  Once boottime is believed to be stable
  it is no longer effected by NTP or other time corrections.

CAVETS:

	* PC speaker no longer works

	* Profiling interrupt rate not increased (it needs work to be
	  made operational on a per-cpu basis rather then system-wide).

	* The native timebase API is function-based, but currently hardwired.

	* There might or might not be issues with 486 systems due to the
	  timer mode I am using.

Revision 1.12: download - view: text, markup, annotated - select for diffs
Sat Jan 24 08:00:45 2004 UTC (10 years, 7 months ago) by dillon
Branches: MAIN
Diff to: previous 1.11: preferred, unified
Changes since revision 1.11: +0 -1 lines
Cleanup the duel-macro specifications in sioreg.h and ns16550.h by having
sioreg.h include ns16550.h.

Submitted-by: Robert Garrett <rg70@sbcglobal.net>

Revision 1.11: download - view: text, markup, annotated - select for diffs
Sun Jan 11 16:45:17 2004 UTC (10 years, 7 months ago) by joerg
Branches: MAIN
Diff to: previous 1.10: preferred, unified
Changes since revision 1.10: +4 -230 lines
Split off the PCCARD specific driver parts of fd and sio and remove last
uses of NCARD and use_card.h. The header will go with the NEWCARD merge.

Revision 1.10: download - view: text, markup, annotated - select for diffs
Wed Aug 27 06:48:14 2003 UTC (11 years ago) by rob
Branches: MAIN
Diff to: previous 1.9: preferred, unified
Changes since revision 1.9: +30 -30 lines
lets go ahead and commit this before we hit the network interfaces
__P removal

Revision 1.9: download - view: text, markup, annotated - select for diffs
Thu Aug 7 21:17:11 2003 UTC (11 years ago) by dillon
Branches: MAIN
Diff to: previous 1.8: preferred, unified
Changes since revision 1.8: +12 -12 lines
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.

Revision 1.8: download - view: text, markup, annotated - select for diffs
Mon Jul 21 05:50:42 2003 UTC (11 years, 1 month ago) by dillon
Branches: MAIN
Diff to: previous 1.7: preferred, unified
Changes since revision 1.7: +7 -5 lines
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).

Revision 1.7: download - view: text, markup, annotated - select for diffs
Sat Jul 19 21:14:37 2003 UTC (11 years, 1 month ago) by dillon
Branches: MAIN
Diff to: previous 1.6: preferred, unified
Changes since revision 1.6: +4 -4 lines
Remove the priority part of the priority|flags argument to tsleep().  Only
flags are passed now.  The priority was a user scheduler thingy that is not
used by the LWKT subsystem.  For process statistics assume sleeps without
P_SINTR set to be disk-waits, and sleeps with it set to be normal sleeps.

This commit should not contain any operational changes.

Revision 1.6: download - view: text, markup, annotated - select for diffs
Sun Jul 6 21:23:50 2003 UTC (11 years, 1 month ago) by dillon
Branches: MAIN
Diff to: previous 1.5: preferred, unified
Changes since revision 1.5: +46 -56 lines
MP Implementation 1/2: Get the APIC code working again, sweetly integrate the
MP lock into the LWKT scheduler, replace the old simplelock code with
tokens or spin locks as appropriate.  In particular, the vnode interlock
(and most other interlocks) are now tokens.  Also clean up a few curproc/cred
sequences that are no longer needed.

The APs are left in degenerate state with non IPI interrupts disabled as
additional LWKT work must be done before we can really make use of them,
and FAST interrupts are not managed by the MP lock yet.  The main thing
for this stage was to get the system working with an APIC again.

buildworld tested on UP and 2xCPU/MP (Dell 2550)

Revision 1.5: download - view: text, markup, annotated - select for diffs
Sun Jun 29 03:28:44 2003 UTC (11 years, 2 months ago) by dillon
Branches: MAIN
CVS tags: PRE_MP
Diff to: previous 1.4: preferred, unified
Changes since revision 1.4: +4 -4 lines
threaded interrupts 1: Rewrite the ICU interrupt code, splz, and doreti code.
The APIC code hasn't been done yet.   Consolidate many interrupt thread
related functions into MI code, especially software interrupts.  All normal
interrupts and software interrupts are now threaded, and I'm almost ready
to deal with interrupt-thread-only preemption.  At the moment I run
interrupt threads in a critical section and probably will continue to do
so until I can make them MP safe.

Revision 1.4: download - view: text, markup, annotated - select for diffs
Wed Jun 25 03:55:56 2003 UTC (11 years, 2 months ago) by dillon
Branches: MAIN
Diff to: previous 1.3: preferred, unified
Changes since revision 1.3: +4 -5 lines
proc->thread stage 4: rework the VFS and DEVICE subsystems to take thread
pointers instead of process pointers as arguments, similar to what FreeBSD-5
did.  Note however that ultimately both APIs are going to be message-passing
which means the current thread context will not be useable for creds and
descriptor access.

Revision 1.3: download - view: text, markup, annotated - select for diffs
Mon Jun 23 17:55:40 2003 UTC (11 years, 2 months ago) by dillon
Branches: MAIN
Diff to: previous 1.2: preferred, unified
Changes since revision 1.2: +8 -21 lines
proc->thread stage 2: MAJOR revamping of system calls, ucred, jail API,
and some work on the low level device interface (proc arg -> thread arg).
As -current did, I have removed p_cred and incorporated its functions
into p_ucred.  p_prison has also been moved into p_ucred and adjusted
accordingly.  The jail interface tests now uses ucreds rather then processes.

The syscall(p,uap) interface has been changed to just (uap).  This is inclusive
of the emulation code.  It makes little sense to pass a proc pointer around
which confuses the MP readability of the code, because most system call code
will only work with the current process anyway.  Note that eventually
*ALL* syscall emulation code will be moved to a kernel-protected userland
layer because it really makes no sense whatsoever to implement these
emulations in the kernel.

suser() now takes no arguments and only operates with the current process.
The process argument has been removed from suser_xxx() so it now just takes
a ucred and flags.

The sysctl interface was adjusted somewhat.

Revision 1.2: download - view: text, markup, annotated - select for diffs
Tue Jun 17 04:28:40 2003 UTC (11 years, 2 months ago) by dillon
Branches: MAIN
Diff to: previous 1.1: preferred, unified
Changes since revision 1.1: +1 -0 lines
Add the DragonFly cvs id and perform general cleanups on cvs/rcs/sccs ids.  Most
ids have been removed from !lint sections and moved into comment sections.

Revision 1.1: download - view: text, markup, annotated - select for diffs
Tue Jun 17 02:54:59 2003 UTC (11 years, 2 months ago) by dillon
Branches: MAIN
CVS tags: FREEBSD_4_FORK
import from FreeBSD RELENG_4 1.291.2.35

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