we need later in the code. This fixes a fatal kernel fault in
pmap_modified_emulation if a user application tries to access a kernel
address that is section-mapped.
Add a diagnostic that detects attempts to call pmap_kenter_pa with a
va that is section-mapped.
caching on for a page just because we are clearing the writable bit in
the PTE: this is incompatible with the way pmap_vac_me_harder works,
and the code in the modified emulation handler doesn't know about
recalculating the cachable attributes (nor should it, IMO).
Also, if we are invalidating a page, flush its TLB entry; for some
reason we were only doing this when clearing the Write or modified
bits.
These patches together seem to solve the random seg-faults that were
still occuring occasionally under heavy paging.
is higher than SPL_HIGH (maybe we should be fixing SPL_HIGH).
If IPL_STATCLOCK is defined, initialize spl_masks[_SPL_STATCLOCK] from
it; otherwise initialize use IPL_CLOCK.
the etc Makefile override that by putting USETOOLS into $.MAKEOVERRIDES
This way the default for kernel compiles is still to use the installed
toolchain instead of depending on $TOOLDIR. $TOOLDIR can be used by
simply adding USETOOLS=yes to the command line as usual.
Adjust each ports template to set the default no setting and also pull in
bsd.own.mk if they weren't already to ensure they'll build correctly
with the new toolchain setup.
support it in the kernel yet. If we don't do this, GDB arbitrarily
assumes we wanted it to be 9, which is silly.
In the kernel, leave it undefined so that sys_process.c doesn't
generate code for it.
the instruction we used with GDB 4.x. The new instruction has the advantage
of fitting the pattern that ARM recommend using for instructions that need to
stay undefined.
(eg ARM920), the mode in which the processor operates is governed by
the use of both the PT_C and PT_B bits:
PT_C=1,PT_B=1 -> Write-back
PT_C=1,PT_B=0 -> Write-through
To support this define pte_cache_mode (initialized to PT_C|PT_B) and
use that when enabling cacheing for a page.
to allocate a L1 pt is often enough to bring the system to its knees:
so make the messages PDEBUG(0,...).
However, even with this step having more than a small number of
processes searching for a L1 pt can still be enough to bring the system
down, since they all run at high priority and sleep for very little time,
thus blocking out user code from completing. So implement an exponential
backoff when waiting for a page table, so that we don't hog the CPU when
memory is scarce.
Tested by running a make of the C compiler with "gnumake -j30" (and plenty
of swap space).
is shared with another process (as can happen if vfork is being used),
then that other process will end up not having a page 0, which is bad
news indeed, since then there is no way back into the kernel.
Found this using a multi-ice box, so they are useful after all!
This seems to fix pr port-arm32/11921 and (possibly) kern/9859.
arch/arm/iomd/* .... the RC7500 isnt really an iomd/vidc machine but has
different video/audio chip and was kind of hardwired/hacked into the other
chip drivers.
The IOMD/VIDC combination is now moved to arch/arm/iomd together. These
files still need a lot of cleaning up :( .... esp. the RC7500 support that
is still dormant in it; this needs either to be removed or split out for
RC7500's ``VIDC'' video/audio variant.
Apart from the RC7500 support wich is still in arch/arm32 the
iomd,vidc,riscpc and podulebus subdirectories of arch/arm32 can be removed.
This split still uses some small parts of arch/arm32 .... those are the MI
parts that haven't been moved yet.
RiscPC/A7000 have been tested and confirmed to build as should NC.
thorpej