mmu/riscv64: implement global page mapping support

ASID allocation is not supported yet, so always use ASID 0 for user pages for now.

Change-Id: I021e77dae692c22984bc625dd0588362bece45b7
Reviewed-on: https://review.haiku-os.org/c/haiku/+/6698
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>

riscv64/smp: Implement multi-processor support

* Working under qemu smp 1,2+
* Working on SiFive Unmatched
* x86_64 efi not broken by smp_boot_other_cpus change

Change-Id: I32ebc17913e46ed082be9ade8f56448bbf12f16e
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4705
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>

kernel/arch/commpage: implement for riscv64

Change-Id: Id7f495896a08a237db85dcedd1174e4c181e373d
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4056
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>

kernel/arch/thread: implement for riscv64

Change-Id: I3effa598626b32c29606299cd0edee390d430baf
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4066
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>

kernel: riscv64 patches

Change-Id: I8ebcbaa395cbccb50af08fd2f1b049b5cbb949c7
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3883
Reviewed-by: Fredrik Holmqvist <fredrik.holmqvist@gmail.com>
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
Reviewed-by: X512 <danger_mail@list.ru>

kernel/riscv64: Fix assembly to disable/enable interrupts

Change-Id: Id4dc7360650e78a9bcadec634be97b279da2d77c
Reviewed-on: https://review.haiku-os.org/c/1378
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

riscv64: Fill in more bulk architecture items around libroot/kernel

Change-Id: Ia2a86d8814d06950ea2d2d19d966c642d26f81d6
Reviewed-on: https://review.haiku-os.org/c/1302
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>