as normal device interrupts. Because of this, we won't get IPIs while
servicing such interrupts. This can lead to the following deadlock
scenario as reported by Bill Sommerfeld:
- Process runs on cpu1, but has FP state on cpu0.
- Process executes FP-using insn, causing an FP trap, which causes
the kernel lock to be acquired.
- At roughly the same time, cpu0 receives a device interrupt, and attempts
to acquire the kernel lock, which blocks since cpu1 already has it.
- cpu1 sends cpu0 a SYNCH FPU IPI, and waits for cpu0 to release its
FP state.
- Since cpu0 cannot notice the IPI until it has processed the device
interrupt, which it cannot do because it cannot acquire the kernel
lock, we have deadlock.
Solve the problem by adding a spinlock interlock release hook which
checks for pending IPIs and processes them.
Idea from Bill Sommerfeld.
rather than assigning to the whole field, set or clear individual flags,
which implies that the B_BUSY and B_INVAL flags will remain set.
this allows us to make the assertion in brelse() that B_BUSY is set,
which is the purpose of all this.
CPU to handle interrupts, but prevents a whole slew of things
from working properly on the second CPU. It is no longer
necessary now that several other bugs have been fixed.
on it, and make sure to deactivate the old process's address space,
as this will not otherwise be done by cpu_switch() later once we're
on the idle PCB.
Also, update some comments related to when s0 (i.e. the old process)
is NULL in the context switching code.
Drochner's work made in nisimura-pmax-wscons branch. Still a little
to do before useful for DECstation. MI softintr required.
- allow wildcard matchs to have zstty/zskbd/zsms in default hardware
configuration.
- abandon to check zs_ioasic_cnattach() return value; it doesn't fail.
- have zs_ioasic_cnattach() serial line parameters hardcoded inside, in
symmetry with zs_ioasic_lk201_cnattach().
pseudo-device pty 2 # pseudo-terminals (Sysinst needs two)
(Some installers may not be using sysinst, in which case this just reduces
the number of ptys from 16 that are not used to 2 that are not used)
For i386 conf files, no change other than comments.
Check the first partition type in devopen(), and if it is of type
FS_RAID, add 64 to blkdev_part_offset.
NOTE: This brings the size of the alpha first-stage bootblocks up to
close to the maximum. RAID1 support is controlled by the
BOOTXX_RAID1_SUPPORT define, and is easy to disable if size
becomes an issue.
based on it working already for macppc.
Also add commented out:
#options VNODE_OP_NOINLINE # Don't inline vnode op calls
#options NFS_V2_ONLY # Exclude NFS3 and NQNFS code
as suggestions for additional savings
maps standard boot flags to corresponding RB_* values
use BOOT_FLAG() in port's MD code as appropriate
as discussed on tech-kern, add new boot flags -v, -q for booting
verbosely or quietly, and corresponding AB_VERBOSE/AB_QUIET
boot flags; also add FreeBSD-compatible bootverbose macro and
NetBSD-specific bootquiet macro
for hpcmips, use new bootverbose instead of it's own hpcmips_verbose
Tested on i386, and to limited extend (compile of affected files) also for
mvme68k, hp300, luna68k, sun3.
indeed tagged with ASM and the ASN, "per the Alpha architecture".
It is therefore safe to cancel any pending lazy I-sync on a
given CPU when a new ASN is assigned on that CPU.
w/ Chuq Silvers. Fixes a panic when a program with wired pages that
has run for a long time when the system is under heavy memory load
exits (specific case was ntpd, reported by Simon Burge).
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.
in the non-MULTIPROCESSOR case (LOCKDEBUG requires it). Scheduler
lock is held upon entry to mi_switch() and cpu_switch(), and
cpu_switch() releases the lock before returning.
Largely from Bill Sommerfeld, with some minor bug fixes and
machine-dependent code hacking from me.
I-sync in pmap_remove_mapping() if the old mapping had PG_EXEC, and
kick curcpu (IMB) or other CPUs (via an IPI) only if the pmap was
the kernel pmap or active on other CPUs (curcpu is handled in userret()).
- Use lazy I-sync everywhere, (hopefully) eliminating the last of the
I-sync issues for multiprocessor support.
- Eliminate some memory barriers added in a couple of previous revisions,
after some discussion on port-alpha/tech-smp.
Still some lazy I-sync optimization possibilites:
- pmap_changebit() does not need to I-sync when only write-protecting
a page.
- pmap_asn_alloc() may be able to cancel a pending lazy I-sync when a
new ASN is allocated. Need to double check against Green Book or
Brown Book.
- pmap_zero_page() and pmap_copy_page(): if MULTIPROCESSOR, issue
a memory barrier after we zero/copy the page, to ensure that
other CPUs see the correct data.
- XXX Should we use MB, or is WMB good enough?
Also, bzero -> memset, bcopy -> memcpy.
- Make sure to do an MB after a PTE is set to a new value, so that
other processors see it.
- Use lazy I-sync in two pmap_page_protect() and in pmap_changebit(),
so that it is MP-safe. XXX Two more places where IMB is used in
the raw, but they're not in the common path.
There'll be some more lazy I-sync cleanups soon.
- MB_LEN_MAX is increased to 32.
- To ensure binary compatibility for old executables
under multibyte locale, versioned setlocale is added.
- __mb_len_cur definision is added in setlocale.c
and enable it in stdlib.h .
It is also important for multibyte locale stuffs,
but I just forgot.
move the vers.c depend/build goo to Makefile.bootprogs and remove
explicit rules in other Makefiles
sync the message in */version files with other ports using newvers_stand.sh
XXX the new depend rules were tested to limited extend (also with obj dirs)
XXX on i386 and should be ok; the changes should not otherwise influence build
have an ISA chipset present before the PCI-EISA bridge has been
attached (because the STDIO module has an ISA DMA-using device,
the floppy controller, connected to it).
device and the id string is not found in option ROM string, but
ULTRIX/OSF1 call it so anyway.
- Squash IOASIC DMA buffer allocation into device attach() sequence.
thorpej