This will allow improvements to the pmaps so that they can more easily defer expensive operations, eg tlb/cache flush, til the last possible moment.
Currently this is a no-op on most platforms, so they should see no difference.
Reviewed by Jason.
need to check for curproc being non-NULL since none of the pmap
interfaces which are legal to use in interrupt handlers use this macro.
- use the hit op when flushing the cache in pmap_kremove().
- avoid trusting the optimizer in pmap_clear_reference().
- fix pmap_clear_modify() to reset the mod-bit emulation so we can
detect further modifications to the page, also flushing the cache
for any mappings which might have dirty lines.
passed which is larger than an int but has int alignment. As well as
fixing the described problem, this is the same way it is handled in the
Irix and Ultrix header files.
Problem and suggested solution by Uros Prestor in port-mips mailling
list.
remove some checks for impossible conditions.
in pmap_enter(), only call pmap_remove() to remove an existing mapping
if there actually is an existing mapping.
in pmap_remove_pv(), don't flush the MIPS1 cache when removing the last mapping.
this was added in rev 1.97, to avoid stale data being left in the cache
when the page is zeroed bypassing the cache in pmap_zero_page_uncached().
we've since found that bypassing the cache for idle-loop page zeroing
doesn't work very well anyway, so we don't do that anymore.
so now we can remove the extra cache-flush.
remove pmap_zero_page_uncached() while I'm thinking of it.
various other cleanup.
interrupt to sneak in after EXL had been set; the interrupt EPC was stale
as PC isn't saved if EXL is set, causing the eret to return to the wrong
place and leading to kernel-mode TLB misses on user addresses. The bug
was discovered by the japanese NetBSD/*mips folks and the same fix was
found independently by shinohara-san (shin@netbsd.org).
- Use pools for pmap structures and pv_entry structures.
- Remove a bunch of splvm()/splx(), no longer needed now that
pmap_kenter_pa() and pmap_kremove() are as they should be.
Mostly from Chuck Silvers.
there are just far too many combinations to handle with magic
#ifdefs in any sane way. Also, add a HitFlushDCache op to the
"locoresw", and fill it in as appropriate (it's NULL on MIPS-I,
so watch out).
These changes ensure that my R4600 Indy (with 2-way cache) gets
the correct cache ops when the kernel is built with only MIPS3
support, resulting in a kernel that is significantly more stable.
distinguished by SYSID register in the system controller. Note
that PRiD 0x20 is for a standalone RC32364 processor which has the
same 32300 core inside. Rather better to name them MIPS32 ISA.
(I have a nice 'install' target for cobalts here, but that only works there.
I guess I'll put that into htdocs now that the cobalt port uses Makefile.mips)
What's wrong; the initial SR value in pcb0 gets overwritten before
the first kthread_create1() is called. For a normal process which
has user mode it doesn't matter because proc_trampoline() makes
the process to have spl0 during exception return path to user mode,
however, kthreads stay in kernel mode mistakenly left in splhigh
condition. The trouble is visible as severe clock drifts when
system activity is high.
is created. System kthreads are mistakenly left splhigh state.
pcb0 has an initial SR value for spl0 condition which are expected to
be propagated to all of children
- use "U" suffix for unsigned constants
- use "L" suffix for long constants
- use "UL" suffix for unsigned long constants
- use hexadecimal instead of decimal
Fixes build problems with vi (now that warnings/errors are enabled) on
mips, powerpc and arm platforms.
each vm_page structure. Add a VM_MDPAGE_INIT() macro to init this
data when pages are initialized by UVM. These macros are mandatory,
but ports may #define them to nothing if they are not needed/used.
This deprecates struct pmap_physseg. As a transitional measure,
allow a port to #define PMAP_PHYSSEG so that it can continue to
use it until its pmap is converted to use VM_MDPAGE_MEMBERS.
Use all this stuff to eliminate a lot of extra work in the Alpha
pmap module (it's smaller and faster now). Changes to other pmap
modules will follow.
to <sys/types.h> and <sys/stdint.h>.
* Add a new C99 <stdint.h> header, which provides integer types of
explicit width, related limits and integer constant macros.
* Extend <inttypes.h> to provide <stdint.h> definitions and format
macros for printf() and scanf().
* Add C99 strtoimax() and strtoumax() functions.
* Use the latter within scanf().
* Add C99 %j, %t and %z printf()/scanf() conversions for
intmax_t, pointer-type and size_t arguments.
- pmap_enter()
- pmap_remove()
- pmap_protect()
- pmap_kenter_pa()
- pmap_kremove()
as described in pmap(9).
These calls are relatively conservative. It may be possible to
optimize these a little more.
calling pmap_steal_memory() directly. On these platforms, since
uvm_pageboot_alloc() is a wrapper around pmap_steal_memory(), there
is no functional change. This is merely for API consistency.
which have pmap_steal_memory(). This is to reduce the API differences
between pmaps that implement pmap_steal_memory() and pmaps which do
not.
Note that pmap_steal_memory() needs to adjust *vstartp and/or
*vendp only if it used addresses within the range provided to UVM
via the pmap_virtual_space() call. I.e. it is not necessary to do
so in any current pmap_steal_memory() implementation.
call overhead is incurred as we start sprinkling pmap_update() calls
throughout the source tree (no pmaps currently defer operations, but
we are adding the infrastructure to allow them to do so).
when error is ERESTART. otherwise, user process will re-issue syscall
with broken system call number and get SIGSYS signal and terminate.
patch made by Jason R Thorpe <thorpej@zembu.com>. tested by me.
and link it directly to db_command_table[] so that it's not necessary
to do this at runtime. Make db_machine_command_table[] const on all ports.
g/c now unneded stuff, like db_machine_commands_install(), db_machine_init()
Patch written by enami.
as hacked by mycroft.
- Use syscall_intern() to give a process a plain or fancy
syscall based on ktrace flags.
- Avoid copying from the trapframe into a local array as much
as possible.
Yields roughly 5% improvement on a 25MHz R3000 (DECstation 5000/200)
on a simple syscall benchmark.
There's still some work that can be done using __HAVE_MINIMAL_EMUL.
jdolecek