routine. Works similarly fto pmap_prefer(), but allows callers
to specify a minimum power-of-two alignment of the region.
How we ever got along without this for so long is beyond me.
a whole 0.01us in lmbench lat_syscall null on our 250Mhz QED system.
$at is still saved just to be safe, although it looks like it does
not need to be. $v1 is used in syscall(), although I'm not sure why.
process's segtab, retiring 'pcb_segtab' field from 'struct pcb'.
This would be another MULTIPROCESSOR unfriendly and the necessity
might be eliminated when the way to hold PTE is redesigned.
make all local variables static
use simplelocks - we really need only mutexes, full locks are not necessary
update couple of comments to be more accurate
add function pty_maxptys(), which provides a safe way to get&set maxptys - this
also supports setting maxptys to lower than current value, if the
value is lower or equal current number of ptys
* in vga_init(), set the screen type to WSCONS_DEFAULT_TYPE, which defaults
to "80x25".
XXX: the code currently makes no attempt to ensure that a font
with the appropriate width & height is available, effectively
limiting this default to either "80x25" or "80x24" at this
time.
* make wsdisplay_screentype_pick() non static, so that vga_init() can use it
The bootloader has been improved by Kazuma Arino.
- dialog style main window
- support to read compressed kernel image
- automatic boot with timer
- human readable configrarion file
version no gets '1.15.00 2000.08.29'
to support arbitrary number of ptys without need of kernel recompile
(the extra device special files in /dev/ still need to be created, of course)
upper limit of supported ptys is controlled via new sysctl variable
kern.maxptys (KERN_MAXPTYS), which is raise-only and defaults to 512.
all of physical memory, i.e. it conceptually is pv_table[0..avail_end].
The previous version could lead to an off-by-one error in the page allocation
for pv_table[] in some memory configurations.
Kernel:
* Add runtime quantity lfs_ravail, the number of disk-blocks reserved
for writing. Writes to the filesystem first reserve a maximum amount
of blocks before their write is allowed to proceed; after the blocks
are allocated the reserved total is reduced by a corresponding amount.
If the lfs_reserve function cannot immediately reserve the requested
number of blocks, the inode is unlocked, and the thread sleeps until
the cleaner has made enough space available for the blocks to be
reserved. In this way large files can be written to the filesystem
(or, smaller files can be written to a nearly-full but thoroughly
clean filesystem) and the cleaner can still function properly.
* Remove explicit switching on dlfs_minfreeseg from the kernel code; it
is now merely a fs-creation parameter used to compute dlfs_avail and
dlfs_bfree (and used by fsck_lfs(8) to check their accuracy). Its
former role is better assumed by a properly computed dlfs_avail.
* Bounds-check inode numbers submitted through lfs_bmapv and lfs_markv.
This prevents a panic, but, if the cleaner is feeding the filesystem
the wrong data, you are still in a world of hurt.
* Cleanup: remove explicit references of DEV_BSIZE in favor of
btodb()/dbtob().
lfs_cleanerd:
* Make -n mean "send N segments' blocks through a single call to
lfs_markv". Previously it had meant "clean N segments though N calls
to lfs_markv, before looking again to see if more need to be cleaned".
The new behavior gives better packing of direct data on disk with as
little metadata as possible, largely alleviating the problem that the
cleaner can consume more disk through inefficient use of metadata than
it frees by moving dirty data away from clean "holes" to produce
entirely clean segments.
* Make -b mean "read as many segments as necessary to write N segments
of dirty data back to disk", rather than its former meaning of "read
as many segments as necessary to free N segments worth of space". The
new meaning, combined with the new -n behavior described above,
further aids in cleaning storage efficiency as entire segments can be
written at once, using as few blocks as possible for segment summaries
and inode blocks.
* Make the cleaner take note of segments which could not be cleaned due
to error, and not attempt to clean them until they are entirely free
of dirty blocks. This prevents the case in which a cleanerd running
with -n 1 and without -b (formerly the default) would spin trying
repeatedly to clean a corrupt segment, while the remaining space
filled and deadlocked the filesystem.
* Update the lfs_cleanerd manual page to describe all the options,
including the changes mentioned here (in particular, the -b and -n
flags were previously undocumented).
fsck_lfs:
* Check, and optionally fix, lfs_avail (to an exact figure) and
lfs_bfree (within a margin of error) in pass 5.
newfs_lfs:
* Reduce the default dlfs_minfreeseg to 1/20 of the total segments.
* Add a warning if the sgs disklabel field is 16 (the default for FFS'
cpg, but not usually desirable for LFS' sgs: 5--8 is a better range).
* Change the calculation of lfs_avail and lfs_bfree, corresponding to
the kernel changes mentioned above.
mount_lfs:
* Add -N and -b options to pass corresponding -n and -b options to
lfs_cleanerd.
* Default to calling lfs_cleanerd with "-b -n 4".
[All of these changes were largely tested in the 1.5 branch, with the
idea that they (along with previous un-pulled-up work) could be applied
to the branch while it was still in ALPHA2; however my test system has
experienced corruption on another filesystem (/dev/console has gone
missing :^), and, while I believe this unrelated to the LFS changes, I
cannot with good conscience request that the changes be pulled up.]
it look at casual inspection like 1 nop is needed but play other tricks.
Still have reduced by 1 nop. Hopefully this covers the NEC 41[x]1. Could
not find info for those processors.
and large page support. This version is a bit more intelligent about
how it deals with kernel text pages.
Now that this is fixed, don't map the kernel text read-write if
DDB is configured.
Currently, the major onboard devices are supported (disk, network,
rs232 and VMEbus). However, work is still need to support the remaining
devices (eg. IndustryPack sites).
These boards are available with a dazzling array of build options. At
this time, the following options are *required*:
o Real floating point hardware (the 68LC040 model isn't tested),
o The VMEchip2 must be present,
o If offboard VMEbus RAM is not present, at least 8MB of onboard
RAM is required.
o Even if offboard VMEbus RAM *is* present, at least 4MB of onboard
RAM is required. (Boards with 1 or 2MB onboard RAM *can* be
supported with offboard RAM, but not without some funky values in
the VMEbus Master mapping registers.)
There is no support for boards other than those in the -LX 200/300 series.
Give rest of clock interrupt code a revamp. Because we are using an external
cycle counter we can now handle loosing several hundred interrupts without
the time slipping.
- Return FALSE if the PTE does not have PG_V set (previously, you would
get always get true of the PDE was valid, even if the PTE was not).
- Teach it about 4MB pages.
in SSTOP state, execpt P_SYSTEM and curproc processes. We have to way to
find the original state of the process so we can't restart scheduling,
so this can only be used at shutdown time.
XXX suspendsched() should also deal with processes running on other CPUs.
I don't know how to do that, and as long as we have a kernel big lock,
this shouldn't be a problem.
* For MIPS RISC/os based diskl labels create partition 8 which is used
by sash (and where bootstrap code hides).
* If existing MIPS RISC/os label is present update disk parameter information
-support access to MII_ANER too for completeness
-remove some hacks which disappeared in FreeBSD if_rl.c
rev. 1.25 (Aug 31 14:45:49 1999)
(the driver could need more updating, but this is what I've tested
for months)
- cac_pci_l0 has been moved to cac.c, since it's useful for EISA boards.
- Model-specific linkage now is responsible for DMA synchronization.
- If we don't recognise the board, print the subsystem ID.
- Add support for RAID LC2 and Smart Array 431.
- Start firmware background tasks on controllers that need it.
- Pull in linkage useful for both PCI and EISA boards from cac_pci.c.
- cac_ccb_done() now frees the done CCB if the CCB callback completes.
- Model-specific linkage is now responsible for DMA synchronization.
- Use wakeup_one() in cac_ccb_free().
- Start synchronous commands `manually'.
- Add one hardware check in DIAGNOSTIC case.
- Improve error messages.
- Start firmware background tasks on controllers that need it.
