Commit Graph

4091 Commits

Author SHA1 Message Date
Marcel Moolenaar
5a39cbaf69 Implement makectx(). The makectx() function is used by KDB to create
a PCB from a trapframe for purposes of unwinding the stack. The PCB
is used as the thread context and all but the thread that entered the
debugger has a valid PCB.
This function can also be used to create a context for the threads
running on the CPUs that have been stopped when the debugger got
entered. This however is not done at the time of this commit.
2004-07-10 19:56:00 +00:00
Marcel Moolenaar
cbc174356c Introduce the KDB debugger frontend. The frontend provides a framework
in which multiple (presumably different) debugger backends can be
configured and which provides basic services to those backends.
Besides providing services to backends, it also serves as the single
point of contact for any and all code that wants to make use of the
debugger functions, such as entering the debugger or handling of the
alternate break sequence. For this purpose, the frontend has been
made non-optional.
All debugger requests are forwarded or handed over to the current
backend, if applicable. Selection of the current backend is done by
the debug.kdb.current sysctl. A list of configured backends can be
obtained with the debug.kdb.available sysctl. One can enter the
debugger by writing to the debug.kdb.enter sysctl.
2004-07-10 18:40:12 +00:00
Marcel Moolenaar
72d44f31a6 Introduce the GDB debugger backend for the new KDB framework. The
backend improves over the old GDB support in the following ways:
o  Unified implementation with minimal MD code.
o  A simple interface for devices to register themselves as debug
   ports, ala consoles.
o  Compression by using run-length encoding.
o  Implements GDB threading support.
2004-07-10 17:47:22 +00:00
Brian Somers
0ac4013324 Change the following environment variables to kernel options:
bootp -> BOOTP
    bootp.nfsroot -> BOOTP_NFSROOT
    bootp.nfsv3 -> BOOTP_NFSV3
    bootp.compat -> BOOTP_COMPAT
    bootp.wired_to -> BOOTP_WIRED_TO

- i.e. back out the previous commit.  It's already possible to
pxeboot(8) with a GENERIC kernel.

Pointed out by: dwmalone
2004-07-08 22:35:36 +00:00
Brian Somers
59e1ebc9b5 Change the following kernel options to environment variables:
BOOTP -> bootp
    BOOTP_NFSROOT -> bootp.nfsroot
    BOOTP_NFSV3 -> bootp.nfsv3
    BOOTP_COMPAT -> bootp.compat
    BOOTP_WIRED_TO -> bootp.wired_to

This lets you PXE boot with a GENERIC kernel by putting this sort of thing
in loader.conf:

    bootp="YES"
    bootp.nfsroot="YES"
    bootp.nfsv3="YES"
    bootp.wired_to="bge1"

or even setting the variables manually from the OK prompt.
2004-07-08 13:40:33 +00:00
Peter Wemm
d8ad50b704 MFi386: various io apic cleanups 2004-07-08 01:42:49 +00:00
Peter Wemm
335e282d3c MFi386: use rman access methods instead of groping around inside
struct resource
2004-07-08 01:34:24 +00:00
Peter Wemm
2e37b53aba MFi386: whitespace nit fix (spare blank line) 2004-07-08 01:32:25 +00:00
Peter Wemm
f08560a569 MFi386: fix up CR0 settings 2004-07-08 01:31:13 +00:00
Peter Wemm
6ad90df2e3 MFi386: 1.57: transparently respect alignment/boundary tags 2004-07-08 01:28:33 +00:00
Alan Cox
26a965568d Simplify the control flow in pmap_extract(), enabling the elimination of a
PMAP_UNLOCK() call.
2004-07-07 16:47:58 +00:00
Alan Cox
03c0ca74ee White space and style changes only. 2004-07-07 02:23:46 +00:00
Alan Cox
c9a217d2ed Style changes to pmap_extract(). 2004-07-06 02:33:11 +00:00
John Baldwin
0c0b25ae91 Implement preemption of kernel threads natively in the scheduler rather
than as one-off hacks in various other parts of the kernel:
- Add a function maybe_preempt() that is called from sched_add() to
  determine if a thread about to be added to a run queue should be
  preempted to directly.  If it is not safe to preempt or if the new
  thread does not have a high enough priority, then the function returns
  false and sched_add() adds the thread to the run queue.  If the thread
  should be preempted to but the current thread is in a nested critical
  section, then the flag TDF_OWEPREEMPT is set and the thread is added
  to the run queue.  Otherwise, mi_switch() is called immediately and the
  thread is never added to the run queue since it is switch to directly.
  When exiting an outermost critical section, if TDF_OWEPREEMPT is set,
  then clear it and call mi_switch() to perform the deferred preemption.
- Remove explicit preemption from ithread_schedule() as calling
  setrunqueue() now does all the correct work.  This also removes the
  do_switch argument from ithread_schedule().
- Do not use the manual preemption code in mtx_unlock if the architecture
  supports native preemption.
- Don't call mi_switch() in a loop during shutdown to give ithreads a
  chance to run if the architecture supports native preemption since
  the ithreads will just preempt DELAY().
- Don't call mi_switch() from the page zeroing idle thread for
  architectures that support native preemption as it is unnecessary.
- Native preemption is enabled on the same archs that supported ithread
  preemption, namely alpha, i386, and amd64.

This change should largely be a NOP for the default case as committed
except that we will do fewer context switches in a few cases and will
avoid the run queues completely when preempting.

Approved by:	scottl (with his re@ hat)
2004-07-02 20:21:44 +00:00
Warner Losh
9a879a35fb We need to make resources visible here as well. 2004-06-30 19:24:26 +00:00
Nate Lawson
1a26ea7f2c Add machdep quirks functions. On i386, this disables acpi on systems with
BIOS dates earlier than Jan 1, 1999.  Add prototypes and quirks flags.
2004-06-30 04:42:29 +00:00
John Baldwin
a7cd01df0e Fetch the actual acpi0 device_t and use device_is_attached() to see if
it's alive rather than trying to fetch its softc pointer via its devclass.

Glanced at by:	imp, njl
2004-06-23 17:59:01 +00:00
Alan Cox
db2a1d54cc Implement the protection check required by the pmap_extract_and_hold()
specification.  This enables the elimination of Giant from that function.
2004-06-23 04:37:14 +00:00
Alan Cox
dc8beb5358 - Simplify pmap_remove_pages(), eliminating unnecessary indirection.
- Simplify the locking of pmap_is_modified() by converting control flow to
   data flow.
2004-06-20 20:57:06 +00:00
Alan Cox
1ec4b75936 Add pmap locking to pmap_is_prefaultable(). 2004-06-20 06:11:00 +00:00
Bruce Evans
4c5f10a672 Backed out previous commit. Blind substitution of dev_t by `struct cdev *'
was just wrong here because the dev_t's are user dev_t's.
2004-06-20 03:52:50 +00:00
Alan Cox
785f2cdf57 Remove unused pt_entry_ts. Remove an unneeded semicolon. 2004-06-19 19:09:08 +00:00
Bruce Evans
7a637a637e Include <sys/_lock.h>'s prerequisite <sys/queue.h> before including the
former, not after.

Don't hide this bug by including <sys/queue.h> in <sys/_lock.h>.
2004-06-19 14:58:35 +00:00
Peter Wemm
a5de0db8b5 Try harder to give new processes a clean initial fpu state. fpu_cleanstate
wasn't actually clean, it was saving the xmm registers as left over by the
bios.  fninit() doesn't clear those.

In fpudna(), instead of doing a fninit() and forgetting to load the initial
mxcsr, do a full fxrstor(&fpu_cleanstate).  Otherwise we hand over whatever
random values are left in the xmm registers by the last user.

I'm not certain of whether this is excessive paranoia or not, but there was
an outright bug in neglecting to set the mxcsr value that caused awk to
SIGFPE in some case.  Especially for Tim Robbins. :-)

i386 probably should do something about the mxcsr setings too.

Found by:  tjr
2004-06-18 04:01:54 +00:00
Nate Lawson
37c55a039a Revert last change. If acpi is loaded or compiled into the kernel, its
devclass will be present even if the driver was disabled by a hint.  Using
device_get_softc() provides the right info even if it's overkill.

Explained by:	jhb
2004-06-17 17:27:37 +00:00
Alan Cox
d45f21f31a Do not preset PG_BUSY on VM_ALLOC_NOOBJ pages. Such pages are not
accessible through an object.  Thus, PG_BUSY serves no purpose.
2004-06-17 06:16:58 +00:00
Poul-Henning Kamp
89c9c53da0 Do the dreaded s/dev_t/struct cdev */
Bump __FreeBSD_version accordingly.
2004-06-16 09:47:26 +00:00
Alan Cox
d7c3bd4918 Add some lock assertions. Lock a small part of pmap_enter(). 2004-06-16 07:51:19 +00:00
Alan Cox
82d8e6f5a0 Correct an error in the implementation of pmap_is_prefaultable(). When I
introduced this function in revision 1.441, I inverted one of the
comparisons.
2004-06-16 03:11:24 +00:00
Alan Cox
7b9d474460 Remove a stale comment. 2004-06-15 19:28:40 +00:00
Alan Cox
0dec7f69a6 Add pmap locking to pmap_extract(), pmap_mincore(), and pmap_remove(). 2004-06-15 07:41:44 +00:00
Nate Lawson
345281bc43 We only need the devclass_find() result, not the softc. 2004-06-15 02:12:12 +00:00
Alan Cox
50f91a9445 Introduce pmap locking to many of the pmap functions. There is more to
come later.
2004-06-14 01:17:50 +00:00
David E. O'Brien
2a79761d77 The majority of FreeBSD/amd64 machines are SMP, so use ADAPTIVE_MUTEXES
by default to improve performance.
2004-06-13 23:03:57 +00:00
Alan Cox
7881f95056 Prevent the loss of a PG_M bit through an SMP race in pmap_ts_referenced(). 2004-06-13 21:59:42 +00:00
Alan Cox
b34ec165b4 Remove dead or unneeded code, e.g., spl calls. 2004-06-13 19:48:38 +00:00
Alan Cox
8559e0a291 - Remove an unused declaration.
- Move a definition inside the scope of a #ifdef _KERNEL.
2004-06-13 03:44:11 +00:00
Alan Cox
2d0dc0fcd6 In a multiprocessor, the PG_W bit in the pte must be changed atomically.
Otherwise, the setting of the PG_M bit by one processor could be lost if
another processor is simultaneously changing the PG_W bit.

Reviewed by:	tegge@
2004-06-12 20:01:48 +00:00
Poul-Henning Kamp
1930e303cf Deorbit COMPAT_SUNOS.
We inherited this from the sparc32 port of BSD4.4-Lite1.  We have neither
a sparc32 port nor a SunOS4.x compatibility desire these days.
2004-06-11 11:16:26 +00:00
Peter Wemm
a520047095 Argh. Add the mini-stack-frame back in for mcount's benefit for syscall
stubs.
2004-06-10 22:02:26 +00:00
Peter Wemm
6d05d7c75a Make profiling work for varargs functions.. %al is an additional argument
which indicates the number of xmm registers used in the varargs.  This
stops the explosion that happened when profiling printf() etc.
2004-06-10 22:00:58 +00:00
Peter Wemm
11b000253e Insta-MFi386: ignore disabled cpu apic id's entirely 2004-06-10 21:30:08 +00:00
John Baldwin
bad4ce7d91 - Use the correct devclass name ("acpi" vs "ACPI") to detect if acpi0 is
present and thus that the PnPBIOS probe should be skipped instead of
  having ACPI zero out the PnPBIOStable pointer.
- Make the PnPBIOStable pointer static to i386/i386/bios.c now that that is
  the only place it is used.
2004-06-10 20:43:04 +00:00
John Baldwin
092a5c4530 Remove atdevbase and replace it's remaining uses with direct references to
KERNBASE instead.
2004-06-10 20:31:00 +00:00
Peter Wemm
591506d322 In pmap_extract_and_hold(), there is no need to mask off PG_FRAME because
pmap_extract() already does it.
In pmap_enter(), opa has already been masked so don't do it again.
Wrap a long line (recent transgression).
Use trunc_page() in pmap_mapdev() instead of anding with PG_FRAME, since
that is what we really meant.

Submitted by:  alc (first item)
2004-06-08 02:20:40 +00:00
Peter Wemm
71e0fe3abc Fix my silly typo in asm statement in previous commit. 2004-06-08 01:35:48 +00:00
Peter Wemm
576bb07aaa Argh. Remove stray number that slipped into the previous commit. 2004-06-08 01:20:37 +00:00
Peter Wemm
96a7759e99 Reapply rev 1.151 after enable sse/fpuinit order fixed in mp_machdep.c
Obtained from:  das
2004-06-08 01:14:39 +00:00
Peter Wemm
18154cd6f8 Set up the fpu *after* enabling SSE mode on AP's
Submitted by: (argh, I can't find the email)
2004-06-08 01:07:51 +00:00
Peter Wemm
430e272c7e Initial PG_NX support (no-execute page bit)
- export the rest of the cpu features (and amd's features).
- turn on EFER_NXE, depending on the NX amd feature bit
- reorg the identcpu stuff a bit in order to stop treating the
  amd features as second class features (since it is now a primary feature
  bit set) and make it easier to export.
2004-06-08 01:02:52 +00:00