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This was a premature optimization from the early days of SerenityOS.
The eternal heap was a simple bump pointer allocator over a static
byte array. My original idea was to avoid heap fragmentation and improve
data locality, but both ideas were rooted in cargo culting, not data.
We would reserve 4 MiB at boot and only ended up using ~256 KiB, wasting
the rest.
This patch replaces all kmalloc_eternal() usage by regular kmalloc().
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We already use the term adapter for instances of this class, so let's
better represent this class by changing its name to what it really is.
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As suggested by @ccapitalK, it makes the interface more neat and clean.
The proper order is to get ScanoutID first, then ResourceID and after it
everything else that is needed to complete the operation successfully.
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A VirtIO graphics adapter is really the VirtIO GPU, so the virtualized
hardware has no distinction between both components so there's no
need to put such distinction in software.
We might need to split things in the future, but when we do so, we must
take proper care to ensure that the interface between the components
is correct and use the usual codebase patterns.
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We never used that type method except in initialization in
GraphicsManagement, and we used it there to query whether the device is
VGA compatible or not.
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This allows us to remove a bunch of PCI API functions, and instead to
leverage the cached data from DeviceIdentifier object in many places.
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Now that the old PCI::Device was removed, we can complete the PCI
changes by making the PCI::DeviceController to be named PCI::Device.
Really the entire purpose and the distinction between the two was about
interrupts, but since this is no longer a problem, just rename it to
simplify things further.
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