17efae27ac
Add a new SMM driver skeleton that registers a root SMI handler, and checks if the SMI control value (written to 0xB2) indicates a CPU hotplug SMI. QEMU's ACPI payload will cause the OS to raise a broadcast SMI when a CPU hotplug event occurs, namely by writing value 4 to IO Port 0xB2. In other words, control value 4 is now allocated for this purpose; introduce the ICH9_APM_CNT_CPU_HOTPLUG macro for it. The standard identifiers in this driver use the new MM (Management Mode) terminology from the PI spec, not the earlier SMM (System Management Mode) terms. Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Igor Mammedov <imammedo@redhat.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Michael Kinney <michael.d.kinney@intel.com> Cc: Philippe Mathieu-Daudé <philmd@redhat.com> Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1512 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Message-Id: <20200226221156.29589-7-lersek@redhat.com> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>