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>

kernel: implement clear_caches for riscv64

Change-Id: I28296725ce22b47e94481abf794b92cf4ffd98a5
Reviewed-on: https://review.haiku-os.org/c/haiku/+/6217
Tested-by: Automation <automation@haiku-os.org>
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

riscv: use atomic CSR bit set/clear operations, refactor

Fix race conditions that cause broken timer interrupts.

Change-Id: I78e13a18d394b1566977e894a1def16a66c9ca5f
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5883
Reviewed-by: X512 <danger_mail@list.ru>
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>

system/riscv64: Use dtb-based time cv for system_time

* Fixes speedy-system_time in qemu

Change-Id: I07ae4d984c09f2f2503bd45acc415c219f3b3f11
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5327
Reviewed-by: waddlesplash <waddlesplash@gmail.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>

riscv: fix typo frequrency -> frequency

Change-Id: I7a2ed220ad96a9b18bff3ac5c115592c8ba87d89
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4334
Reviewed-by: Axel Dörfler <axeld@pinc-software.de>

kernel/arch/platform: implement for riscv64

Change-Id: Id1839ef39d927e6a2017c8b8ac3482d9eeb00fa1
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4059
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>

kernel/arch/cpu: implement for riscv64

Change-Id: Ib4dd636f9ebb62931f77c809185ea810485d801e
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4057
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.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>