bootloader: Implement TSC calibration via hypervisor CPUID leaf.

While debugging some problems on the HaikuPorts build VMs, mmlr
noticed their clocks had an alarming amount of drift. This prompted
an investigation into TSC calibration mechanisms, and the discovery
that there is a VM-specific one which we did not implement.

This mechanism is more accurate than counting cycles on VMs where
cycles can be "stolen" (the probable cause of the aforementioned
clock drift.)

Tested in VMware (works out of the box) and on QEMU/KVM
(may need TSC frequency specified or a host with invariant TSC.)

Change-Id: I4ccfdb2e4e2621404ec9026e7106c02bf96faf18
Reviewed-on: https://review.haiku-os.org/c/haiku/+/7063
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

efi: Refactor CPU code to be arch-specific

* Migrate some platform agnostic architecture code into
boot/arch from efi/arch. This helps to avoid conflicts
between kernel and boot sources as well.
* Conflicts between arch_cpu in efi and kernel code means
bootcode really should *never* directly use kernel arch
headers. (other platforms don't, which is why they don't
have this same issue)
* We carefully thread any needed kernel headers (namely
assembly helper macros) into the bootloader headers without
mixing in the whole conflicting kernel/arch headers.
* ARM now properly get its cpu init code called, and we
progress further into the EFI bootloader.

Change-Id: If67ec9758b5ce68563ebd9eb45d5196401911c67
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2975
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

boot_loader: load intel microcode update data file

Previous version of the patch was broken by the EFI refactoring.

Change-Id: I6dd125100b22b2461c531bfd8f81b3dd28e2b751
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2409
Reviewed-by: Jérôme Duval <jerome.duval@gmail.com>

Revert "boot_loader: load intel microcode update data file"

This reverts commit a7320593242cc0863fc909c1a32dbd255384d7dd.

It broke the build on most boot platforms (including EFI.)

boot_loader: load intel microcode update data file

Change-Id: I323a57cc0b1f05ad7b60b6a141d068a3e618ee4d
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2263
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

system/boot: More cleanup and shuffling

* arm efi additions
* cleanup some cpu headers which were oddly
split between efi and bios_ia32
* Move calculate_cpu_conversion_factor over to
arch_timer since it is timerish, and x86 only
* Drop some duplicated code from efi start. Move
hpet init code into efi timer/hpet code

Change-Id: Ia4264a5690ba8c09417b06788febc4f572f111ce
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2259
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

cpu: Extract shared x86 code from efi & bios_ia32

This issue was initially detected by PVS Studio (issue number V547) and fixed
as part of Google Code-in 2019.

The initial problem was the calculate_cpu_conversion_factor function
which had been copied in the BIOS and EFI versions of the boot code.
Further investigation led to more duplicated or very similar functions
being identified.

Introduce an arch_cpu.h for the x86 boot platform to group these things
in a single place, and adjust the BIOS and EFI code to call into that.
Note that the BIOS and EFI code is still a little platform specific,
ideally there should be a boot_arch_cpu_init() function for each
architecture as already done for openfirmware and u-boot.

Also remove some irrelevant comments from copypasted files for other
architectures, as that was filling my git grep with useless noise.

Change-Id: I16d815f0bf015cec0b4e03cc14f3cc447c7164c5
Reviewed-on: https://review.haiku-os.org/c/haiku/+/1985
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>