This will be a memory usage pessimization until we actually implement
CoW sharing of the memory pages with SharedInodeVMObject.
However, it's a huge architectural improvement, so let's take it and
improve on this incrementally.
fork() should still be neutral, since all private mappings are CoW'ed.
It's now up to the caller to provide a VMObject when constructing a new
Region object. This will make it easier to handle things going wrong,
like allocation failures, etc.
When forking a process, we now turn all of the private inode-backed
mmap() regions into copy-on-write regions in both the parent and child.
This patch also removes an assertion that becomes irrelevant.
If we wrote anything we should just inform userspace that we did,
and not worry about the error code. Userspace can call us again if
it wants, and we'll give them the error then.
We don't have to log the process name/PID/TID, dbg() automatically adds
that as a prefix to every line.
Also we don't have to do .characters() on Strings passed to dbg() :^)
The IRQController object is RefCounted, and is shared between the
InterruptManagement class & IRQ handlers' classes.
IRQHandler, SharedIRQHandler & SpuriousInterruptHandler classes
use a responsible IRQ controller directly instead of calling
InterruptManagement for disable(), enable() or eoi().
Also, the initialization process of InterruptManagement is
simplified, so it doesn't rely on an ACPI parser to be initialized.
More namespaces have been added to organize the declarations
in a more sensible way.
Also, a namespace StaticParsing has been added to allow early
access to ACPI tables.
You can now mmap a file as private and writable, and the changes you
make will only be visible to you.
This works because internally a MAP_PRIVATE region is backed by a
unique PrivateInodeVMObject instead of using the globally shared
SharedInodeVMObject like we always did before. :^)
Fixes#1045.
We now have PrivateInodeVMObject and SharedInodeVMObject, corresponding
to MAP_PRIVATE and MAP_SHARED respectively.
Note that PrivateInodeVMObject is not used yet.
Add an extra out-parameter to shbuf_get() that receives the size of the
shared buffer. That way we don't need to make a separate syscall to
get the size, which we always did immediately after.
This feels a lot more consistent and Unixy:
create_shared_buffer() => shbuf_create()
share_buffer_with() => shbuf_allow_pid()
share_buffer_globally() => shbuf_allow_all()
get_shared_buffer() => shbuf_get()
release_shared_buffer() => shbuf_release()
seal_shared_buffer() => shbuf_seal()
get_shared_buffer_size() => shbuf_get_size()
Also, "shared_buffer_id" is shortened to "shbuf_id" all around.
Now we check before we set a FBResolution if the BXVGA device is capable
of setting the requested resolution.
If not, we revert the resolution to the previous one and return an error
to userspace.
Fixes#451.
