Commit Graph

14 Commits

Author SHA1 Message Date
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
Peter Wemm
c3aac50f28 $Id$ -> $FreeBSD$ 1999-08-28 01:08:13 +00:00
Tor Egge
572d053e17 Maintain a mapping from irq number to (ioapic number, int pin) tuple,
and use this when masking/unmasking interrupts.

Maintain a mapping from (iopaic number, int pin) tuple to irq number,
and use this when configuring devices and programming the ioapics.

Previous code assumed that irq number was equal to int pin number, and
that the ioapic number was 0.

Don't let an AP enter _cpu_switch before all local apics are initialized.
1998-09-06 22:41:42 +00:00
Steve Passe
570dbb53e0 Eliminate frequent silo overflows by restoring the TEST_LOPRIO code.
This code was eliminated when the PEND_INTS algorithm was added.  But it was
discovered that PEND_INTS only worsen latency for FAST_INTR() routines,
which can't be marked pending.

Noticed & debugged by:	dave adkins <adkin003@gold.tc.umn.edu>
1997-08-04 17:31:43 +00:00
Steve Passe
2e6a5b15a9 Converted the TEST_LOPRIO code to default. 1997-07-31 05:39:49 +00:00
Steve Passe
d2ecb616f2 Split TEST_CPUSTOP code into CPUSTOP_ON_DDBBREAK and mainline code. 1997-07-18 21:27:53 +00:00
Steve Passe
4ec664e4c1 Removed a stale "FIXME:". 1997-07-15 04:56:18 +00:00
Steve Passe
4d29853614 New defines to eliminate "magic numbers" in various places. 1997-07-15 02:47:54 +00:00
Steve Passe
ad2e8ff493 General cleanup of APIC code.
stop_cpus/restart_cpus STILL not working!
1997-07-08 23:32:58 +00:00
Steve Passe
0eaccbadd9 Added fields to the LVT1/2 group. 1997-06-27 22:13:50 +00:00
Peter Wemm
b3196e4b9f Preliminary support for per-cpu data pages.
This eliminates a lot of #ifdef SMP type code.  Things like _curproc reside
in a data page that is unique on each cpu, eliminating the expensive macros
like:    #define curproc (SMPcurproc[cpunumber()])

There are some unresolved bootstrap and address space sharing issues at
present, but Steve is waiting on this for other work.  There is still some
strictly temporary code present that isn't exactly pretty.

This is part of a larger change that has run into some bumps, this part is
standalone so it should be safe.  The temporary code goes away when the
full idle cpu support is finished.

Reviewed by: fsmp, dyson
1997-06-22 16:04:22 +00:00
Steve Passe
08942d4605 apic.h now has structure definitions for both the local APIC and io APIC.
apic.h has defines like:
#define lapic__id       lapic->id

Once private pages and "known virtual addr" mapping of the APICs is
ready all 'lapic__XXX' will be changed to 'lapic.XXX', and the defines
will be removed.

Changes to smp.h for lapic_t lapic && ioapic_t ioapic pointers,
currently equal to apic_base && io_apic_base, will stand alone with the
private page mapping.
1997-05-29 05:57:43 +00:00
Steve Passe
2897614119 informal discussion between Bruce Evans <bde@zeta.org.au>,
Peter Wemm <peter@spinner.DIALix.COM>, Steve Passe <smp@csn.net>

removed all the IPI_INTS code.
made the XFAST_IPI32 code default, renaming Xfastipi32 to Xinvltlb.
1997-04-27 21:17:56 +00:00
Peter Wemm
477a642cee Man the liferafts! Here comes the long awaited SMP -> -current merge!
There are various options documented in i386/conf/LINT, there is more to
come over the next few days.

The kernel should run pretty much "as before" without the options to
activate SMP mode.

There are a handful of known "loose ends" that need to be fixed, but
have been put off since the SMP kernel is in a moderately good condition
at the moment.

This commit is the result of the tinkering and testing over the last 14
months by many people.  A special thanks to Steve Passe for implementing
the APIC code!
1997-04-26 11:46:25 +00:00