* Added a comment to vm_remove_all_page_mappings() that shows that we need to
change the mapping spinlock into a mutex.
* Pointed out some potential problems in the code.
* Added vm_page_at_index(), vm_clear_map_activation(), and vm_test_map_activation()
in preparation of the page scanner rewrite.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20407 a95241bf-73f2-0310-859d-f6bbb57e9c96
mapped fully read-only (for both kernel and userland). Previously a
kernel read access to a yet unmapped r/w accessible userland address
would cause the page from the lower cache to be mapped with write
permission for userland (on x86 also for the kernel) thus e.g.
allowing a fork()ed child process to write to the parent process'
memory.
Fixes bugs #113 and #928.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20402 a95241bf-73f2-0310-859d-f6bbb57e9c96
{set,clear}_debugger_{break,watch}point(), allowing to set/clear break
and watchpoints for the calling team. When a break/watchpoint is hit,
the team enters the debugger. Handy in situations when the program in
question can't really be started in a debugger (or it would be
complicated to do so). The functions work only as long as no debugger is
installed for the team.
We clear the arch specific team and thread debug infos now, when a new
debugger is installed, thus clearing break- and watchpoints.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20396 a95241bf-73f2-0310-859d-f6bbb57e9c96
* NewBlock()/FreeBlock() are now symmetrical in that the former no longer inserts
the block into the hash table.
* delete_transaction() also no longer removes the transaction from the hash table.
* cache_transaction_sync() now uses the new hash_remove_current() function.
* minor other cleanup (like line breaks).
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20374 a95241bf-73f2-0310-859d-f6bbb57e9c96
hashtable in case of a read error (NewBlock() also adds the block,
but FreeBlock() only frees it).
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20365 a95241bf-73f2-0310-859d-f6bbb57e9c96
suggested by Ingo; before it would just fill the physical pages with NULL pointers.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20364 a95241bf-73f2-0310-859d-f6bbb57e9c96
start address wasn't aligned and numBytes was a multiple of the page
size, the last page was ignored. A subsequent get_memory_map() would
return NULL as physical address for that page, if it hadn't been mapped
before (that function looks generally suspicious, IMHO). E.g. reads from a
device into an unaligned buffer that hadn't been touched before would
hit that problem. Fixes bug #1075. Might also fix other reported
problems (like #1056), since this bug could have cause all kinds of weird
behavior and crashes.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20362 a95241bf-73f2-0310-859d-f6bbb57e9c96
that points to both, the page and the area the page is in. This will allow a page
scanner to steal unused pages when necessary.
* The locking is currently done with a spinlock which we might want to have another
look at one day.
* dump_page() and dump_area_struct() now dump the page mappings as well.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20356 a95241bf-73f2-0310-859d-f6bbb57e9c96
add-ons accordingly and removed the syscall.
* Removed send_notification().
* Reimplemented notify_listener(). It used the unimplemented
send_notification(). Now it has a chance to work. Note that
notify_listener() is obsolete. I would already have removed it, if
there weren't lots of FS implementations still using it (Hint!).
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20329 a95241bf-73f2-0310-859d-f6bbb57e9c96
vnode::covered_by fields. Together with sMountOpLock it allows write
access, either lock alone suffices for read access. Before
sMountOpLock had to be acquired for read (and write) access, which
meant that while mounting/unmounting a FS path resolution would have
to wait. In case of the UserlandFS this would even cause a deadlock
while mounting if the client tried to resolve the path of the device
to be mounted (e.g. by opening it).
* Added a clarifying comment about read access to the
fs_mount::covers_vnode/root_vnode field and removed locking in
resolve_volume_root_to_mount_point() which was not necessary for
explained reasons.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20308 a95241bf-73f2-0310-859d-f6bbb57e9c96
name (saves copying the name, if that has to be done anyway) and added a
wrapper version with the old interface.
* dir_vnode_to_path() was broken for file systems that didn't support
the get_vnode_name() hook. It resolved the mount point too early, so
that it was searching the mount point and not the FS root dir for the
node. It uses the get_vnode_name() function now (before resolving the
mount point).
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20305 a95241bf-73f2-0310-859d-f6bbb57e9c96
to B_FULL_LOCK.
* vm_clone_area() now respects the source area's wiring and inherits it. This
should fix bug #1055.
* vm_cache::type is now duplicated in vm_area::cache_type - this allows looking
it up without having to lock a vm_cache_ref; this also solves a locking bug
in vm_unmap_pages() in this regard.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20281 a95241bf-73f2-0310-859d-f6bbb57e9c96
* Made the output look a bit more like that of the other commands.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20279 a95241bf-73f2-0310-859d-f6bbb57e9c96
Basically, there was a pretty subtle race between the cpus in main where if the main cpu released the AP cpus and then before the AP cpus had a chance to run the boot cpu started creating the main thread (which causes smp ici messages to be created) the system would livelock, where the boot cpu waited forever for the AP cpu to acknowledge the ICI (for a TLB flush when creating the kernel stack).
Added smp_cpu_rendezvous(), used to synchronize all the cpus to a particular point, and used it a few times in main().
While i was at it i fixed another race that'll probably never happen, but what the hey. Make sure the kernel args are copied into kernel space by the main cpu before letting any other ones use it.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20269 a95241bf-73f2-0310-859d-f6bbb57e9c96
* vm_area and vm_page now have a new field "mappings" where they will store lists
of vm_page_mapping structures. vm_page::ref_count is gone, as it's no longer
needed (it was never updated correctly, anyway).
* vm_caches now have a type field, ie. CACHE_TYPE_RAM for anonymous areas - this
makes the stores a bit less independent, but is quite handy in several places.
* Added new vm_map_page() and vm_unmap_pages() functions to be used whenever you
map in or unmap pages into/from an area. They don't do much more than handling
vm_page::wired_count correctly right now, though (ie. B_LAZY_LOCK is now working
as expected as well).
* Moved the device fault handler to vm_map_physical_memory(); it was not really
used as a fault handler, anyway.
* Didn't notice Ingo's changes to the I/O space region broke lock_memory(). It
now checks the type of the area that contains the memory, and doesn't lock
anymore if not needed which solves the problem in a platform independent way.
* Implemented lock_memory() and unlock_memory() for real: they now change the
vm_page::wired_count member to identify pages that shouldn't be paged out.
* vm_area_for() now uses vm_area_lookup() internally.
* Fixed various potential overflow conditions with areas that reach 0xffffffff.
* Creating anonymous areas with B_FULL_LOCK no longer causes vm_soft_fault()
to be called, instead, the pages are allocated and mapped (via vm_map_page())
directly.
* Removed the _vm_ prefix for create_area_struct() and create_reserved_area_struct().
* Fixed a bug in vm_page_write_modified() that would not have enqueued pages that
failed to be written to the modified queue again when needed.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20251 a95241bf-73f2-0310-859d-f6bbb57e9c96
opening bracket) - thanks!
* Shuffled functions a bit around to separate static and exported functions.
* Some other cleanup.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20245 a95241bf-73f2-0310-859d-f6bbb57e9c96
* Renamed them, made everything static besides vm_allocate_early() (previous
vm_alloc_from_kernel_args()) which now allows you to specify a different
virtual than physical size, and therefore makes vm_alloc_virtual_from_kernel_args()
superfluous (which isn't exported anymore, and is now called allocate_early_virtual()).
* Enabled printing a stack trace on serial output on team crash - it doesn't hurt
for now, anyway.
* Cleanup.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20244 a95241bf-73f2-0310-859d-f6bbb57e9c96
The kernel arg logic was faulty, and wasn't using strlcpy properly (which returns the size of the src string, not the remaining size). Replaced it with a simpler, but less efficient series of strlcat()s.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20162 a95241bf-73f2-0310-859d-f6bbb57e9c96
The first use is to let the kernel decide what the preferred syscall mechanism is at boot time and copy the
appropriate user space code there. Can be used for routines the kernel can decide best how to use (memcpy, some
timing routines, etc).
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20161 a95241bf-73f2-0310-859d-f6bbb57e9c96
the new cpuid stuff was apparently exacerbating an existing problem where various bits of low level
cpu code (specifically get_current_cpu) weren't really initialized before being used. Changed the
order to set up a fake set of threads to point each cpu at really early in boot to make sure that at
all points in code it can get the current 'thread' and thus the current cpu.
A probably better solution would be to have dr3 point to the current cpu which would then point to the
current thread, but that has a race condition that would require an int disable, etc.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20160 a95241bf-73f2-0310-859d-f6bbb57e9c96
away cpuid info into the current cpu structure. Trouble was the code was running before the current
thread pointer was set on each cpu, so it was always looking up cpu 0's structure and saving there,
leaving the other ones uninitialized. Surprisingly this works fine on my machine, but obviously fails
on others (cpuid info would have been zeroed probably). Solution is to change the order that things
are brought up on each cpu to set the current thread pointer first. I don't really like that solution
but it'll work for now. Added a comment to the effect.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20154 a95241bf-73f2-0310-859d-f6bbb57e9c96
Now two complete tss structures exist within the per-cpu structure. Instead
of having to create a seperate area per each one, initialize them in place.
Also, the old mechanism to getting all of the cpus to get initialized was
subtly broken, but still managed to work. Now, just force all the cpus to
initialize at boot, which makes the actual swapping of esp0 somewhat simpler.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20131 a95241bf-73f2-0310-859d-f6bbb57e9c96
