arm64: Add exception handling, handle pagetables access and dirty flags.

Change-Id: I751d78eb458da16098d236f3829d0c26540fbc17
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5264
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>

arm64: Implement IRQ masking for kernel

Signed-off-by: Jaroslaw Pelczar <jarek@jpelczar.com>
Change-Id: I05e41f8cd28834e4bcc9f02b4694a640f460cd17
Reviewed-on: https://review.haiku-os.org/c/haiku/+/1856
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

ARM64: Add initial kernel headers

Signed-off-by: Augustin Cavalier <waddlesplash@gmail.com>
aarch64 -> arm64 and coding style fixes by me.