arch-x86: Split out and implement INT for real mode.

The INT instruction is much simpler in real mode than it is in legacy
protected mode.

Change-Id: I79f5bc7ebe36726537cd61657f301905085c1199
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/55449
Reviewed-by: Gabe Black <gabe.black@gmail.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
2 files changed