Commit Graph

566 Commits

Author SHA1 Message Date
Mike Smith
8ade16819d Increase the default NAPIC from 1 to 2 as a bandaid until we allocate
these dynamically (ie. typically you shouldn't have to set NAPIC at all)
2000-08-18 20:09:15 +00:00
Tor Egge
d9b05734cc Prepare for a cleanup of pmap module API pollution introduced by the
suggested fix in PR 12378.

Keep track of all existing pmaps independent of existing processes.

This allows for a process to temporarily connect to a different address
space without the risk of missing an update of the original address space if
the kernel grows.

pmap_pinit2() is no longer needed on the i386 platform but is left as a
stub until the alpha pmap code is updated.

PR:		12378
2000-08-16 21:24:44 +00:00
Peter Wemm
37b087a645 Clean up some low level bootstrap code:
- stop using the evil 'struct trapframe' argument for mi_startup()
  (formerly main()).  There are much better ways of doing it.
- do not use prepare_usermode() - setregs() in execve() will do it
  all for us as long as the p_md.md_regs pointer is set.  (which is
  now done in machdep.c rather than init_main.c.  The Alpha port did it
  this way all along and is much cleaner).
- collect all the magic %cr0 etc register settings into one place and
  have the AP's call that instead of using magic numbers (!!) that keep
  changing over and over again.
- Make it safe to call kthread_create() earlier, including during the
  device probe sequence.  It doesn't need the callback mechanism that
  NetBSD's version uses.
- kthreads created this way are root-less as they exist before the root
  filesystem is mounted.  init(1) is set up so that it aquires the root
  pointers prior to running.  If other kthreads want filesystem acccess
  we can make this code more generic.
- set all threads start times once we have decided what time it is.
- init uses a trampoline rather than the evil prepare_usermode() hack.
- kern_descrip.c has a couple of tweaks to deal with forking when there
  is no rootdir or cwd etc.
- adjust the early SYSINIT() sequence so that a few prereqisites are in
  place. eg: make sure the run queue is initialized before doing forks.

With this, the USB code can easily create a kthread to do the device
tree discovery.  (I have tested it, it works nicely).

There are still some open issues before this is truely useful.
- tsleep() does not like working before the clock is running.  It
  sort-of tries to spin wait, but it can do more useful things now.
- stopping a kthread in kld code at unload time is "interesting" but
  we have a solution for that.

The Alpha code needs no changes for this.  It already uses pretty much the
same strategies, but a little cleaner.
2000-08-11 09:05:12 +00:00
Tor Egge
4428d39d63 Don't skip IOAPIC id conflict detection when only one pci bus is present.
PR:		20312
Reviewed by:	Steve Roome <steve@sse0691.bri.hp.com>
2000-08-10 17:33:24 +00:00
Tor Egge
e666f57c3e Be more verbose when changing APIC ID on an IO APIC.
Don't allow cpu entries in the MP table to contain APIC IDs out of range.

Don't write outside array boundaries if an IO APIC entry in the MP table
contains an APIC ID out of range.

Assign APIC IDs for all IO APICs according to section 3.6.6 in the
Intel MP spec:

  - If the current APIC ID on an IO APIC doesn't conflict with other
    IO APICs or CPUs, that APIC ID should be used.  The copy of the MP
    table must be updated if the corresponding APIC ID in the MP table
    is different.

  - If the current APIC ID was in conflict with other units, the
    corresponding APIC ID specified in the MP table is checked for conflict.

  - If a conflict is still found then fall back to using a new unique ID.
    The copy of the MP table must be updated.

  - IDs out of range is considered to be in conflict.

During these operations, the IO_TO_ID array cannot be used, since any
conflict would have caused information loss.  The array is then corrected,
since all APIC ID conflicts should have been resolved.

PR:	20312, 18919
2000-08-06 00:04:03 +00:00
Bruce Evans
933aec2f75 Fixed syntax errors and style bugs in previous commit. The syntax
errors were normally harmless because they were in unreachable code
and gcc apparently doesn't check the syntax inside asm statements
that it optimizes away.
2000-06-14 18:48:39 +00:00
Mike Smith
c3c50c4e3a Further fixes for multiple-IO-APIC systems from Tor Egge:
Further experimentation showed that some Dell 2450 machines with the
prevention kludge installed still got T_RESERVED traps.  CPU interrupt
vector 0x7A was observed to be triggered.  This might have been the
bitwise OR of two different vectors sent from each of the IOAPICs at
the same time.

	IOAPIC #0: 0x68 --> irq 8: RTC timer interrupt
	IOAPIC #1: 0x32 --> irq 18: scsi host adapter or network interface
		   ----
		   0x7a --> T_RESERVED

Both IOAPICs had ID 0.

Appendix B.3 in the MP spec indicates that the operating system is
responsible for assigning unique IDs to the IOAPICs.

The enclosed patch programs the IOAPIC IDs according to the IOAPIC
entries in the MP table.

Submitted by:	tegge
2000-05-31 21:37:28 +00:00
Jake Burkholder
e39756439c Back out the previous change to the queue(3) interface.
It was not discussed and should probably not happen.

Requested by:		msmith and others
2000-05-26 02:09:24 +00:00
Jake Burkholder
740a1973a6 Change the way that the queue(3) structures are declared; don't assume that
the type argument to *_HEAD and *_ENTRY is a struct.

Suggested by:	phk
Reviewed by:	phk
Approved by:	mdodd
2000-05-23 20:41:01 +00:00
Peter Wemm
0385347c1a Implement an optimization of the VM<->pmap API. Pass vm_page_t's directly
to various pmap_*() functions instead of looking up the physical address
and passing that.  In many cases, the first thing the pmap code was doing
was going to a lot of trouble to get back the original vm_page_t, or
it's shadow pv_table entry.

Inspired by: John Dyson's 1998 patches.

Also:
Eliminate pv_table as a seperate thing and build it into a machine
dependent part of vm_page_t.  This eliminates having a seperate set of
structions that shadow each other in a 1:1 fashion that we often went to
a lot of trouble to translate from one to the other. (see above)
This happens to save 4 bytes of physical memory for each page in the
system.  (8 bytes on the Alpha).

Eliminate the use of the phys_avail[] array to determine if a page is
managed (ie: it has pv_entries etc).  Store this information in a flag.
Things like device_pager set it because they create vm_page_t's on the
fly that do not have pv_entries.  This makes it easier to "unmanage" a
page of physical memory (this will be taken advantage of in subsequent
commits).

Add a function to add a new page to the freelist.  This could be used
for reclaiming the previously wasted pages left over from preloaded
loader(8) files.

Reviewed by:	dillon
2000-05-21 12:50:18 +00:00
Mike Smith
f0ba8e211c Implement real read/write barriers for the i386. Despite the comment in
previous versions of this file, some barrier functionality is required.
2000-05-18 00:06:10 +00:00
David E. O'Brien
25f0103084 When using _asm{} in GCC, one must specify the operand's size if one
specifies the instruction's operation size.  GCC will default to 32-bit
operands reguardless of the prototype (ie, formal parameters' type)
of an inline function.
2000-05-10 01:15:55 +00:00
Mike Smith
300451c472 Some more i386-only BIOS-friendliness:
- Add support for using the PCI BIOS functions for configuration space
   accesses, and make this the default.

 - Make PNPBIOS the default (obsoletes the PNPBIOS config option).

 - Add two new boot-time tunables to disable each of the above.
2000-04-16 20:48:33 +00:00
Peter Wemm
255108f385 Make sysv-style shared memory tuneable params fully runtime adjustable
via sysctl.  It's done pretty simply but it should be quite adequate.
Also move SHMMAXPGS from $machine/include/vmparam.h as the comments that
went with it were wrong... we don't allocate KVM space for the pages so
that comment is bogus..  The only practical limit is how much physical
ram you want to lock up as this stuff isn't paged out or swap backed.
2000-03-30 07:17:05 +00:00
KATO Takenori
91cb959ddb Added indirect pio into the bus space stuff for the NEC PC-98. bus.h
includes one of bus_at386.h and bus_pc98.h. Becuase only bus_pc98.h
supports indirect pio and bus_at386.h is identical to old bus.h, there
is no functional change in PC-AT's kernels.  That is, it cannot cause
performance loss.

Submitted by:	nyan
Reviewed by:	imp
bde and luoqi provided useful comments for earlier version.
2000-03-29 03:15:22 +00:00
Matthew Dillon
db6a426158 The SMP cleanup commit broke UP compiles. Make UP compiles work again. 2000-03-28 18:06:49 +00:00
Matthew Dillon
36e9f877df Commit major SMP cleanups and move the BGL (big giant lock) in the
syscall path inward.  A system call may select whether it needs the MP
    lock or not (the default being that it does need it).

    A great deal of conditional SMP code for various deadended experiments
    has been removed.  'cil' and 'cml' have been removed entirely, and the
    locking around the cpl has been removed.  The conditional
    separately-locked fast-interrupt code has been removed, meaning that
    interrupts must hold the CPL now (but they pretty much had to anyway).
    Another reason for doing this is that the original separate-lock for
    interrupts just doesn't apply to the interrupt thread mechanism being
    contemplated.

    Modifications to the cpl may now ONLY occur while holding the MP
    lock.  For example, if an otherwise MP safe syscall needs to mess with
    the cpl, it must hold the MP lock for the duration and must (as usual)
    save/restore the cpl in a nested fashion.

    This is precursor work for the real meat coming later: avoiding having
    to hold the MP lock for common syscalls and I/O's and interrupt threads.
    It is expected that the spl mechanisms and new interrupt threading
    mechanisms will be able to run in tandem, allowing a slow piecemeal
    transition to occur.

    This patch should result in a moderate performance improvement due to
    the considerable amount of code that has been removed from the critical
    path, especially the simplification of the spl*() calls.  The real
    performance gains will come later.

Approved by: jkh
Reviewed by: current, bde (exception.s)
Some work taken from: luoqi's patch
2000-03-28 07:16:37 +00:00
Martin Cracauer
cce9dd21c1 Exchange numerical values for FPE_INTDIV and FPE_INTOVF, so that they
are compatible with the older ones implemented in FreeBSD 3.x.

PR:		15488
2000-03-20 10:22:19 +00:00
Martin Cracauer
0c14a6606b Change the default FPU control word so that exceptions for new
processes are now masked until set by fpsetmask(3).

Submitted by:	bde
Approved by:	jkh, bde
2000-03-10 17:56:33 +00:00
Peter Dufault
383774c417 Patches that eliminate extra context switches in FIFO case.
Fixes p1003_1b regression test in the simple case of no RR and
FIFO processes competing.

Reviewed by:	jkh, bde
2000-03-02 16:20:07 +00:00
Brian S. Dean
80275388cb Fix an __asm operand constraint which broke the -O3 and -O0 builds.
Submitted by:	Seigo Tanimura <tanimura@freebsd.org>
Approved by:	jkh
2000-02-21 13:06:50 +00:00
Brian S. Dean
de8050f9b8 Don't forget to reset the hardware debug registers when a process that
was using them exits.

Don't allow a user process to cause the kernel to take a TRCTRAP on a
user space address.

Reviewed by:	jlemon, sef
Approved by:	jkh
2000-02-20 20:51:23 +00:00
David E. O'Brien
ed0010ed09 Document the support in the kernel for hardware debug registers on the
ix86 platform which allows for hardware watchpoints, etc...

Submitted by:	Brian Dean <brdean@unx.sas.com>
2000-02-12 18:33:54 +00:00
Bruce Evans
be16a3aba0 Fixed the profiling version ALTENTRY(). Again. The previous version
didn't set up the frame pointer before calling mcount, and then jumped
to the wrong place in ENTRY() to defeat the point of the jump.
2000-01-25 09:01:55 +00:00
Jason Evans
ed25321907 Move ENTRY and ALTENTRY definitions to asm.h where they belong.
Unbreak profiling.  Again.

Submitted by:	bde
2000-01-20 03:15:01 +00:00
Matthew N. Dodd
de9cfdd736 Allow SMP systems with an MCA bus to work properly.
Reviewed by:	peter
2000-01-13 09:09:02 +00:00
Bruce Evans
c83b1328f1 Fixed style bugs related to the access functions for the bsfl and bsrl
i386 instructions.
2000-01-09 16:46:03 +00:00
Luoqi Chen
5c8b298e0e Allow SMP && NCPU == 1 to work. From now on, there's no restriction on the
value of NCPU relative to the number of cpus physically present, the actual
number of cpus utilized will be the smaller of the two.
2000-01-07 08:49:25 +00:00
Tor Egge
82916a1126 ISA device drivers use the ISA source interrupt number in locations where
the low level interrupt handler number should be used.  Change
setup_apic_irq_mapping() to allocate low level interrupt handler X (Xintr${X})
for any ISA interrupt X mentioned in the MP table.

Remove an assumption in the driver for the system clock (clock.c) that
interrupts mentioned in the MP table as delivered to IOAPIC #0 intpin Y
is handled by low level interrupt handler Y (Xintr${Y}) but don't assume
that low level interrupt handler 0 (Xintr0) is used.

Don't allocate two low level interrupt handlers for the system clock.
Reviewed by:	NOKUBI Hirotaka <hnokubi@yyy.or.jp>
2000-01-04 22:24:59 +00:00
Peter Wemm
664a31e496 Change #ifdef KERNEL to #ifdef _KERNEL in the public headers. "KERNEL"
is an application space macro and the applications are supposed to be free
to use it as they please (but cannot).  This is consistant with the other
BSD's who made this change quite some time ago.  More commits to come.
1999-12-29 04:46:21 +00:00
Peter Wemm
7ba4a77549 Reclaim UPAGES_HOLE (8k) that was chopped out of process address space.
The UPAGES have not been there since Jan '96, but the hole was preserved
for BSD/OS binary compatability.  This has been fixed other ways (%ebx
now has a pointer to PS_STRINGS), and the stack is nowhere near where
it used to be so this hack isn't required anymore.
1999-12-11 10:54:06 +00:00
Luoqi Chen
91c28bfde0 User ldt sharing. 1999-12-06 04:53:08 +00:00
Marcel Moolenaar
204fed67d2 oszsigcode -> szosigcode
Pointed out by: bde
1999-12-04 10:53:39 +00:00
Marcel Moolenaar
ec1d9fe8ff Fix type of sf_addr.
Pointed out by: bde
1999-12-04 10:40:24 +00:00
Bruce Evans
8a9d4d98b1 Moved scheduling-related code to kern_synch.c so that it is easier to fix
and extend.  The new function containing the code is named schedclock()
as in NetBSD, but it has slightly different semantics (it already handles
incrementation of p->p_cpticks, and it should handle any calling frequency).

Agreed with in principle by:	dufault
1999-11-27 12:32:27 +00:00
Matthew Dillon
cd906fe3de Optimize two cases in the MP locking code. First, it is not necessary
to use a locked cmpexg when unlocking a lock that we already hold, since
    nobody else can touch the lock while we hold it.  Second, it is not
    necessary to use a locked cmpexg when locking a lock that we already
    hold, for the same reason.  These changes will allow MP locks to be used
    recursively without impacting performance.

    Modify two procedures that are called only by assembly and are already
    NOPROF entries to pass a critical argument in %edx instead of on the
    stack, removing a significant amount of code from the critical path
    as a consequence.

Reviewed by:	Alfred Perlstein <bright@wintelcom.net>, Peter Wemm <peter@netplex.com.au>
1999-11-19 16:49:30 +00:00
Luoqi Chen
e870e9b278 Segment registers can be read(write) to(from) memory locations as well as
general registers.
1999-11-15 19:45:19 +00:00
David E. O'Brien
dfe41fc832 Fix clobbers so that GENERIC may compile with GCC 2.95.2.
Historically, the documentation of extended asm was lacking, namely you
should NOT specify the same register as an input, and a clobber.
If the register is clobbered, it should be specified as an output as well,
e.g., by linking input and output through the "number" notation.
(Beware of lvalues, some local variables needed...)

URL:http://egcs.cygnus.com/faq.html

In versions up to egcs-1.1.1, the compiler did not even warn about it,
but it was liable to output bad code. Newer egcs are pickier and simply
refuse to swallow such code.

Note, since *addr changes, it needs to be an output operand.
We might be excessive in saying that all memory has changed.

Obtained from:	OpenBSD
		w/extra thanks to Marc Espie <Marc.Espie@liafa.jussieu.fr>
1999-11-14 03:36:34 +00:00
Marcel Moolenaar
e6daa89c15 Reserve space for FPU state in struct sigcontext. Fix some style bugs
and comments while there.

Submitted by: bde
1999-11-12 13:52:11 +00:00
Marcel Moolenaar
4c53edc53b Change the type of sf_addr in struct {o}sigframe from char* to
register_t.

Fix some style bugs and bitrotted comments.

Submitted by: bde
1999-11-12 11:21:34 +00:00
Mitsuru IWASAKI
29803c2003 i8254_restore is called from apm_default_resume() to reload
the countdown register.
this should not be necessary but there are broken laptops that
do not restore the countdown register on resume.
when it happnes, it messes up the hardclock interval and system clock,
which leads to the infamous "calcru: negative time" problem.

Submitted by:	kjc, iwasaki
Reviewed by:	Steve O'Hara-Smith <steveo@eircom.net> and committers.
Obtained from:	PAO3
1999-10-30 14:56:01 +00:00
Tor Egge
64793e7fe2 Eliminate remaining part of incorrect PCI bus numbering sanity check on systems with more than one PCI bus. 1999-10-15 21:38:15 +00:00
Doug Rabson
45f0aa1f0e * Implement bus_set/get/delete_resource for pci.
* Change the hack used on the alpha for mapping devices into DENSE or
  BWX memory spaces to a simpler one. Its still a hack and should be
  a seperate api to explicitly map the resource.
* Add $FreeBSD$ as necessary.
1999-10-14 21:38:33 +00:00
Luoqi Chen
645682fd40 Add a per-signal flag to mark handlers registered with osigaction, so we
can provide the correct context to each signal handler.

Fix broken sigsuspend(): don't use p_oldsigmask as a flag, use SAS_OLDMASK
as we did before the linuxthreads support merge (submitted by bde).

Move ps_sigstk from to p_sigacts to the main proc structure since signal
stack should not be shared among threads.

Move SAS_OLDMASK and SAS_ALTSTACK flags from sigacts::ps_flags to proc::p_flag.
Move PS_NOCLDSTOP and PS_NOCLDWAIT flags from proc::p_flag to procsig::ps_flag.

Reviewed by:	marcel, jdp, bde
1999-10-11 20:33:17 +00:00
Peter Wemm
01fb93b213 Zap unneeded #includes
Submitted by:	phk
1999-10-11 14:50:03 +00:00
Marcel Moolenaar
210430fd8d Simplification of the signal trampoline and other cleanups.
o  Remove unused defines from genassym.c that were needed
   by the trampoline.
o  Add load_gs_param function to support.s that catches
   a fault when %gs is loaded with an invalid descriptor.
   The function returns EFAULT in that case.
o  Remove struct trapframe from mcontext_t and replace it
   with the list of registers.
o  Modify sendsig and sigreturn accordingly.

This commit contains a patch by bde.

Reviewed by: luoqi, jdp
1999-10-07 12:40:34 +00:00
Marcel Moolenaar
c5c6b7b38e Re-introduction of sigcontext.
struct sigcontext and ucontext_t/mcontext_t are defined in such
a way that both (ie struct sigcontext and ucontext_t) can be
passed on to sigreturn. The signal handler is still given a
ucontext_t for maximum flexibility.

For backward compatibility sigreturn restores the state for the
alternate signal stack from sigcontext.sc_onstack and not from
ucontext_t.uc_stack. A good way to determine which value the
application has set and thus which value to use, is still open
for discussion.

NOTE: This change should only affect those binaries that use
      sigcontext and/or ucontext_t. In the source tree itself
      this is only doscmd. Recompilation is required for those
      applications.

This commit also fixes a lot of style bugs without hopefully
adding new ones.

NOTE: struct sigaltstack.ss_size now has type size_t again. For
      some reason I changed that into unsigned int.

Parts submitted by: bde
sigaltstack bug found by: bde
1999-10-04 19:33:58 +00:00
Peter Wemm
693612eb0b Use the rev 1.1.2.1 code from RELENG_3 for atomic operations rather
than the non-atomic C macros.
1999-10-04 16:24:08 +00:00
Peter Wemm
b87104737a Typo: s/__GNUC_MINOR_/__GNUC_MINOR__/
(__GNUC_MINOR__ on egcs in -current is "91" and is going to be "95" soon)
1999-10-04 16:18:04 +00:00
Marcel Moolenaar
576642ef6f Fix style bug: order includes
Submitted by: bde
1999-10-04 13:55:35 +00:00