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Setting the page table base register (ttbr0_el1) is not enough, and will
not flush the TLB caches, in contrary with x86_64 where setting the CR3
register will actually flush the caches. This commit adds the necessary
code to properly flush the TLB caches when context switching. This
commit also changes Processor::flush_tlb_local to use the vmalle1
variant, as previously we would be flushing the tlb's of all the cores
in the inner-shareable domain.
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This replaces the previous owning address space pointer. This commit
should not change any of the existing functionality, but it lays down
the groundwork needed to let us properly access the region table under
the address space spinlock during page fault handling.
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The code in PageDirectory.cpp now keeps track of the registered page
directories, and actually sets the TTBR0_EL1 to the page table base of
the currently executing thread. When context switching, we now also
change the TTBR0_EL1 to the page table base of the thread that we
context switch into.
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The handling of page tables is very architecture specific, so belongs
in the Arch directory. Some parts were already architecture-specific,
however this commit moves the rest of the PageDirectory class into the
Arch directory.
While we're here the aarch64/PageDirectory.{h,cpp} files are updated to
be aarch64 specific, by renaming some members and removing x86_64
specific code.
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These are added to make clear that the current memory situation in the
aarch64 kernel is not complete yet.
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This makes it easier to differentiate between cases where certain
functionality is not implemented vs. cases where a code location
should really be unreachable.
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FIXME: There's still a lot to do like for example, port `quickmap_page`.
This does however get us further into the boot process than before.
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Until now, our kernel has reimplemented a number of AK classes to
provide automatic internal locking:
- RefPtr
- NonnullRefPtr
- WeakPtr
- Weakable
This patch renames the Kernel classes so that they can coexist with
the original AK classes:
- RefPtr => LockRefPtr
- NonnullRefPtr => NonnullLockRefPtr
- WeakPtr => LockWeakPtr
- Weakable => LockWeakable
The goal here is to eventually get rid of the Lock* classes in favor of
using external locking.
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