Commit Graph

16 Commits

Author SHA1 Message Date
Thomas Moestl
816663a0b3 Fix crashes that would happen when more than one 4MB page was used to
hold the kernel text, data and loader metadata by not using a fixed slot
to store the TSB page(s) into. Enter fake 8k page entries into the kernel
TSB that cover the 4M kernel page(s), sot that pmap_kenter() will work
without having to treat these pages as a special case.

Problem reported by:	mjacob, obrien
Problem spotted and 4M page handling proposed by:       jake
2002-04-02 17:50:13 +00:00
Jake Burkholder
f1bb97a884 Fix a deadlock condition with tlb shootdown ipi delivery. Since ipis are
not blocked by raising the pil, a reciever may be interrupted while holding
a spinlock.  If the sender does not defer interrupts throughout the entire
operation it may be interrupted and try to acquire a spinlock held by a
reciever, leading to a deadlock due to the synchronization used by the
ipi handlers themselves.

Submitted by:	tmm
2002-03-23 04:20:00 +00:00
Jake Burkholder
4f91e3efb2 Implement delivery of tlb shootdown ipis. This is currently more fine grained
than the other implementations; we have complete control over the tlb, so we
only demap specific pages.  We take advantage of the ranged tlb flush api
to send one ipi for a range of pages, and due to the pm_active optimization
we rarely send ipis for demaps from user pmaps.

Remove now unused routines to load the tlb; this is only done once outside
of the tlb fault handlers.
Minor cleanups to the smp startup code.

This boots multi user with both cpus active on a dual ultra 60 and on a
dual ultra 2.
2002-03-07 06:01:40 +00:00
Jake Burkholder
39028e8396 Modify the tlb demap API to take a pmap instead of a tlb context number.
Due to allocating tlb contexts on the fly, we only ever need to demap the
primary context, non-primary contexts have already been implicitly flushed
by context switching.  All we really need to tell is if its a kernel demap
or not, and its easier just to compare against the kernel_pmap which is a
constant.
2002-03-07 05:25:15 +00:00
Jake Burkholder
907164660a Dig the information about which tlb slots were used to map the kernel out
of the metadata passed by the loader.
2002-03-04 07:07:10 +00:00
Jake Burkholder
5573db3f0b Allocate tlb contexts on the fly in cpu_switch, instead of statically 1 to 1
with pmaps.  When the context numbers wrap around we flush all user mappings
from the tlb.  This makes use of the array indexed by cpuid to allow a pmap
to have a different context number on a different cpu.  If the context numbers
are then divided evenly among cpus such that none are shared, we can avoid
sending tlb shootdown ipis in an smp system for non-shared pmaps.  This also
removes a limit of 8192 processes (pmaps) that could be active at any given
time due to running out of tlb contexts.

Inspired by:		the brown book
Crucial bugfix from:	tmm
2002-03-04 05:20:29 +00:00
Jake Burkholder
3c997c536c Modify the tte format to not include the tlb context number and to store the
virtual page number in a much more convenient way; all in one piece.  This
greatly simplifies the comparison for a matching tte, and allows the fault
handlers to be much simpler due to not having to load wierd masks.
Rewrite the tlb fault handlers to account for the new format.  These are also
written to allow faults on the user tsb inside of the fault handlers; the
kernel fault handler must be aware of this and not clobber the other's
registers.  The faults do not yet occur due to other support that is needed
(and still under my desk).

Bug fixes from:	tmm
2002-02-25 04:56:50 +00:00
Jake Burkholder
4d6fc96f19 Add inlines for demapping a range of pages from the itlb and dtlb. This
will be used to reduce the number of tlb shootdown ipis in an smp system
by sending one ipi for a whole range of pages, instead of one per page.
Munge the context demap operations slightly to support demapping a non-primary
context.
2002-02-23 21:10:06 +00:00
Jake Burkholder
e87e98c1d6 Use intr_disable/intr_restore instead of TLB_ATOMIC_START/END.
Submitted by:	tmm
2002-02-23 20:59:35 +00:00
Jake Burkholder
4339fe0983 1. Certain tlb operations need to be atomic, so disable interrupts for
their duration.  This is still only effective as long as they are
   only used in the static kernel.  Code in modules may cause instruction
   faults which makes these break in different ways anyway.
2. Add a load bearing membar #Sync.
3. Add an inline for demapping an entire context.

Submitted by:	tmm (1, 2)
2001-12-29 07:07:35 +00:00
Jake Burkholder
44217f38a5 Remove traces that are loud and not that useful. Remove nested include
of ktr.h.
2001-10-20 15:58:31 +00:00
Jake Burkholder
8cf38f95f7 Add ktr traces. 2001-09-03 22:57:21 +00:00
Jake Burkholder
fa01c0ff70 1. Add code to demap pages from the tlb for user contexts.
2. Add a context argument to most functions, instead of extracting it from
   from the tte.

Submitted by:	tmm (1).
2001-08-10 04:21:44 +00:00
David E. O'Brien
73a4930297 The author isn't a [UC] Regents. Correct the copyright language. 2001-08-09 02:09:34 +00:00
Jake Burkholder
d15f935586 Oops. Last commit to tsb.h should have gone here.
Fix macros for eadling with tte contexts and add macros for sfsr fields.
2001-08-06 02:21:53 +00:00
Jake Burkholder
89bf8575ee Flesh out the sparc64 port considerably. This contains:
- mostly complete kernel pmap support, and tested but currently turned
  off userland pmap support
- low level assembly language trap, context switching and support code
- fully implemented atomic.h and supporting cpufunc.h
- some support for kernel debugging with ddb
- various header tweaks and filling out of machine dependent structures
2001-07-31 06:05:05 +00:00