Commit Graph

10 Commits

Author SHA1 Message Date
John Baldwin
42b6a681bc Increment kobj_lookup_misses on a miss rather than decrementing it.
Otherwise, the miss count is actually -kobj_lookup_misses.  Mostly a
pedantic change as KOBJ_STATS isn't on by default.
2005-12-29 18:00:42 +00:00
Peter Grehan
e000e00118 Export a routine, kobj_machdep_init(), that allows platforms
to use the kobj subsystem as soon at mutex_init() has been called
instead of having to wait for the SI_SUB_LOCK sysinit.

Reviewed by:	dfr
2005-08-07 02:20:35 +00:00
Doug Rabson
46ba7a35f2 * Add multiple inheritance to kobj. Each class can have zero or more base
classes and if a method is not found in a given class, its base classes
  are searched (in the order they were declared). This search is recursive,
  i.e. a method may be define in a base class of a base class.
* Change the kobj method lookup algorithm to one which is SMP-safe. This
  relies only on the constraint that an observer of a sequence of writes
  of pointer-sized values will see exactly one of those values, not a
  mixture of two or more values. This assumption holds for all processors
  which FreeBSD supports.
* Add locking to kobj class initialisation.
* Add a simpler form of 'inheritance' for devclasses. Each devclass can
  have a parent devclass. Searches for drivers continue up the chain of
  devclasses until either a matching driver is found or a devclass is
  reached which has no parent. This can allow, for instance, pci drivers
  to match cardbus devices (assuming that cardbus declares pci as its
  parent devclass).
* Increment __FreeBSD_version.

This preserves the driver API entirely except for one minor feature used
by the ISA compatibility shims. A workaround for ISA compatibility will
be committed separately. The kobj and newbus ABI has changed - all modules
must be recompiled.
2003-10-16 09:16:28 +00:00
Cameron Grant
828447e0ca add a read-only sysctl to display the number of entries in the fixed size
kobj global method table; also kassert that the table has not overflowed
when defining a new method.

there are indications that the table is being overflowed in certain
situations as we gain more kobj consumers- this will allow us to check
whether kobj is at fault.  symptoms would be incorrect methods being called.
2003-08-14 21:16:46 +00:00
David E. O'Brien
677b542ea2 Use __FBSDID(). 2003-06-11 00:56:59 +00:00
Kelly Yancey
3316a80bd1 Convert hit and miss counters to unsigned values. Surely negative values
for either does not make sense.

PR:		(one small part of) 19720
2002-06-10 22:40:26 +00:00
David Malone
7cc0979fd6 Convert more malloc+bzero to malloc+M_ZERO.
Submitted by:	josh@zipperup.org
Submitted by:	Robert Drehmel <robd@gmx.net>
2000-12-08 21:51:06 +00:00
Doug Rabson
f80e454726 Add kobj_class_compile_static() to allow classes to be initialised
statically (i.e. without calling malloc). This allows kobj to be used
very early in the boot sequence.
2000-08-28 21:11:12 +00:00
Doug Rabson
4b4a49fda5 * Move the driver_t::refs field to kobj_t to replace kobj_t::instances.
* Back out a couple of workarounds for the confusion between
  kobj_t::instances and driver_t::refs.
2000-05-01 10:45:15 +00:00
Doug Rabson
f7b7769172 * Factor out the object system from new-bus so that it can be used by
non-device code.
* Re-implement the method dispatch to improve efficiency. The new system
  takes about 40ns for a method dispatch on a 300Mhz PII which is only
  10ns slower than a direct function call on the same hardware.

This changes the new-bus ABI slightly so make sure you re-compile any
driver modules which you use.
2000-04-08 14:17:18 +00:00