CVS log for src/sys/arch/vax/include/lock.h

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Keyword substitution: kv
Default branch: MAIN

vax: __cpu_simple_lock audit.

Fix missing "memory" asm clobber so the compiler can't reorder memory
access around __cpu_simple_lock/lock_try/unlock.

__cpu_simple_lock(9): Omit needless barriers in init.

It is, and always has been, the caller's responsibility to ensure the
lock is initialized before it can be used -- otherwise the memory
could hold garbage; it is nonsensical to even attempt locking
operations on it before initialization.

So there's no need to issue explicit barriers here.  The barrier
seems to have been introduced in sys/arch/alpha/alpha/lock_machdep.c
rev. 1.1 (since moved to inline asm in alpha/include/lock.h) and then
copied & pasted into several other architectures.

Merge changes from current as of 20200406

Nix mb_* on vax.

update from HEAD

more const.

Sync with HEAD

Update copyright notice for Ludd (remove clause 3 & 4).

sync with head.

Sync with HEAD.

Sync with HEAD.

Use kernel locking routines only with _HARDKERNEL

Sync with HEAD.

sync with head.

sync with HEAD

sync with head.

A number of performance changes:
Change internal register SSP to contain curlwp insread curcpu().  This
shrinks the GENERIC by 2KB.
Add rwlock stubs (rw_enter, rw_exit, rw_tryenter).
Simplify simple lock code for uniprocessors.
Do SPL raise/lower in cpu_handle_ipi instead of simple_locks.

sync with HEAD

sync with head.

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.

Sync with head.

Sync with HEAD

Sync with HEAD.

Merge nick-csl-alignment.

sync with head.

Provide __SIMPLELOCK_{UN,}LOCKED_P and __cpu_simple_lock_{set,clear}
for all architectures.

Sync with HEAD.

cpu_simple_lock() calls are emitted in the UP case if DEBUG || DIAGNOSTIC.
This should probably be fixed somewhere else, but currently just include
it here. Fixes PR#35866 from Henry R. Bent.

- sync with head.
- move sched_changepri back to kern_synch.c as it doesn't know PPQ anymore.

sync with head.

- use __inline like the other ports do.
- use __ in parameter names
- provide separate prototype lines.

fix a typo - s/_inline/inline/

Partially adapt the VAX port to the newlock2 changes.  These are untested
but they do at least compile.

sync with head.

inline -> __inline

__asm__ -> __asm
__const__ -> const
__inline__ -> inline
__volatile__ -> volatile

Remove leading __ from __(const|inline|signed|volatile) -- it is obsolete.

merge ktrace-lwp.

Sync with HEAD. Here we go again...

Fixes to make GENERIC.MP build again.  Several changes:
 o Rename global variable "tramp" to "vax_mp_tramp" to avoid warning
   with -Wshadow when compiling the signal code.
 o Rename a macro-local variable _s to __s in __cpu_simple_lock()
   to avoid -Wshadow warning when MALLOC() is used (also declares _s).
 o Follow up -Wcast-qual by making a number of function arguments const char*
   where string literals are used.

Fix the sync with head I botched.

Sync with HEAD.

Sync with HEAD

Hm, let ipfresend also compile; move <machine/intr.h> include
in under the _KERNEL_OPT define.

Since we are using the spl() functions here, also include <machine/intr.h>.

Move __cpu_simple_lock_t and __SIMPLELOCK_{UN,}LOCKED to machine/types.h
so that they can be used in a namespace-friendly way.

#ifdef _KERNEL_OPT police; identd defines _KERNEL before some includes.

Make sure to include opt_foo.h if a defflag option FOO is used.

This file has a _KERNEL dependency on <machine/cpu.h>.  So include it.
[GENERIC.MP builds again.]

Catch up to -current.

sync kqueue with -current; this includes merge of gehenna-devsw branch,
merge of i386 MP branch, and part of autoconf rototil work

Add missing register prefixes.

Catch up to -current.

Add non-_KERNEL variants so regress/sys/kern/lock will compile.

Catch up to -current.

file lock.h was added on branch nathanw_sa on 2002-09-17 21:18:28 +0000

Add rudimentary multiprocessor support for DDB.

Check for console printf's in spinlocks, per discussion on tech-smp.

Implement spinlocks as subroutines instead of inlines.
Add SPINLOCK_SPIN_HOOK; the VAX has low-priority IPIs like Alpha.

Update thorpej_scsipi to -current as of a month ago
A i386 GENERIC kernel compiles without the siop, ahc and bha drivers
(will be updated later). i386 IDE/ATAPI and ncr work, as well as
sparc/esp_sbus. alpha should work as well (untested yet).
siop, ahc and bha will be updated once I've updated the branch to current
-current, as well as machine-dependant code.

file lock.h was added on branch thorpej_scsipi on 2000-11-20 20:32:56 +0000

GCC 2.96 wants the = constraint first.  Also change to be a bit more
efficient.  Instead of using indirect register access, change the
constraint to memory and use the value directly.  This allow PC-rel
access among other things.

Let each platform typedef the new __cpu_simple_lock_t, which should
be the most efficient type used for the atomic operations in the
simplelock structure, and should also be __volatile.

#define	__SIMPLELOCK_LOCKED and __SIMPLELOCK_UNLOCKED.

Require that each each MACHINE/MACHINE_ARCH supply a lock.h.  This file
contains the values __SIMPLELOCK_LOCKED and __SIMPLELOCK_UNLOCKED, which
replace the old SIMPLELOCK_LOCKED and SIMPLELOCK_UNLOCKED.  These files
are also required to supply inline functions __cpu_simple_lock(),
__cpu_simple_lock_try(), and __cpu_simple_unlock() if locking is to be
supported on that platform (i.e. if MULTIPROCESSOR is defined in the
_KERNEL case).  Change these functions to take an int * (&alp->lock_data)
rather than the struct simplelock * itself.

These changes make it possible for userland to use the locking primitives
by including <machine/lock.h>.

First cut of multiprocessor support for vax. Still much to do before
other CPUs than the master can spin up.