tree c469f6ed6f7ca584e3b4bae3c3d0a35d1b7ddbf0
parent 9e45420d522334fc0105b2ecd186c7497dd64b4e
author Roland McGrath <mcgrathr@google.com> 1594253705 +0000
committer CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org> 1594253705 +0000

[kernel][arch] Add <lib/arch/x86/msr.h> API

This provides access to x86 Model-Specific Registers in the
lib/arch API.  For now, only a few trivial ones are defined.
This also generates the <lib/arch/x86/msr-asm.h> header that
can be used by assembly code.

Along the way, clean up uses of lib/arch in host code by
separating the host case from the specific target machine cases.
A new "host" sublibrary fills in stubs for the machine-dependent
headers so that machine-independent headers can be used on host.

Test: mostly refactor, still builds; new assembly constants used by later change
Change-Id: I36d21d86beee19d2064f109fe1f7f945c219c559
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/403058
Commit-Queue: Joshua Seaton <joshuaseaton@google.com>
Reviewed-by: Tess Eisenberger <teisenbe@google.com>
Testability-Review: Tess Eisenberger <teisenbe@google.com>