Start fleshing out basic support for floating-point instructions in the
UserspaceEmulator CPU.
This is all work done by @nico for #3576. I'm just merging it all in
this patch since it's a decent foundation to continue working on. :^)
As per this line in the specification:
Unless stated otherwise, a document’s encoding is the utf-8 encoding,
content type is "application/xml", URL is "about:blank", origin is an
opaque origin, type is "xml", and its mode is "no-quirks".
https://dom.spec.whatwg.org/#document
This patch makes Page weakable and allows page-less frames to exist.
Page is single-owner, and Frame is multiple-owner, so it's not sound
for Frame to assume its containing Page will stick around for its own
entire lifetime.
Fixes#3976.
This allows issuing asynchronous requests for devices and waiting
on the completion of the request. The requests can cascade into
multiple sub-requests.
Since IRQs may complete at any time, if the current process is no
longer the same that started the process, we need to swich the
paging context before accessing user buffers.
Change the PATA driver to use this model.
Rework the PS/2 keyboard and mouse drivers to use a common 8042
controller driver. Also, reset and reconfigure the 8042 controller
as they are not guaranteed to be in the state that we expect.
We can't just to_string() the PropertyName, it might be a symbol.
Instead to_value() it and then use to_string_without_side_effects() as
usual.
Fixes#4062.
Problem:
- The default constructor is is deleted because NonnullRefPtr has no
default constructor and there is a member variable of that type, but
the function is set as `= default`.
Solution:
- Remove the code because the function is actually deleted implicitly.
Problem:
- CMake is not outputting `compile_commands.json`.
- `compile_commands.json` is used by build integration tooling such as
`clang-tidy`.
Solution:
- Enable `CMAKE_EXPORT_COMPILE_COMMANDS` option so that the file is
output.
Problem:
- `typedef` is a keyword which comes from C and carries with it old
syntax that is hard to read.
- Creating type aliases with the `using` keyword allows for easier
future maintenance because it supports template syntax.
- There is inconsistent use of `typedef` vs `using`.
Solution:
- Use `clang-tidy`'s checker called `modernize-use-using` to update
the syntax to use the newer syntax.
- Remove unused functions to make `clang-tidy` happy.
- This results in consistency within the codebase.
This allows us to check code for syntax errors without relying on
Function(), which can lead to false negatives as certain things are
valid in a function context, but not outside one.
Problem:
- Building with clang is broken because of the `struct` vs `class`
mismatch between the definition and declaration.
Solution:
- Change `class` to `struct` in the forward declaration.
When two processors send each others a SMP message at the same time
they need to process messages while waiting for delivery of the
message they just sent, or they will deadlock.
Problem:
- IPv4Address class cannot be used in a compile-time context.
- A union is used by initializing one of the members and reading the
non-active member. This is undefined behavior and not permitted in a
`constexpr` context.
Solution:
- Eliminate undefined behavior by changing to a simple `u32` for
storage instead of the union and performing mask/shift calculations
for obtaining the individual octets.
- Decorate functions with `constexpr` where possible. Currently string
formatting and optionals are not `constexpr`-capable so functions
using those are left out.
- Modify tests to validate functionality in a `constexpr` context in
addition to the run-time tests already being run. This ensures that
functionality is the same in both contexts.
Previously we would iterate over all the live HeapBlocks in order to
learn if an arbitrary pointer-sized value was a pointer into a live
HeapBlock. This was quite time-consuming.
Instead of that, just put all the live HeapBlock*'s in a HashTable
and identify pointers by doing a bit-masked lookup into the table.
This is making me question the usefulness of application-global
shortcuts, but for now let's just prevent them from triggering while
you're looking at a modal message box..
This makes most operations thread safe, especially so that they
can safely be used in the Kernel. This includes obtaining a strong
reference from a weak reference, which now requires an explicit
call to WeakPtr::strong_ref(). Another major change is that
Weakable::make_weak_ref() may require the explicit target type.
Previously we used reinterpret_cast in WeakPtr, assuming that it
can be properly converted. But WeakPtr does not necessarily have
the knowledge to be able to do this. Instead, we now ask the class
itself to deliver a WeakPtr to the type that we want.
Also, WeakLink is no longer specific to a target type. The reason
for this is that we want to be able to safely convert e.g. WeakPtr<T>
to WeakPtr<U>, and before this we just reinterpret_cast the internal
WeakLink<T> to WeakLink<U>, which is a bold assumption that it would
actually produce the correct code. Instead, WeakLink now operates
on just a raw pointer and we only make those constructors/operators
available if we can verify that it can be safely cast.
In order to guarantee thread safety, we now use the least significant
bit in the pointer for locking purposes. This also means that only
properly aligned pointers can be used.
