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OvmfPkg/CpuHotplugSmm: introduce skeleton for CPU Hotplug SMM driver

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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>
This commit is contained in:
Laszlo Ersek
2020-02-26 23:11:46 +01:00
committed by mergify[bot]
parent 49df3fcee1
commit 17efae27ac
9 changed files with 248 additions and 2 deletions
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5
OvmfPkg/Include/IndustryStandard/Q35MchIch9.h
View File

@@ -109,8 +109,9 @@
//
// IO ports
//
#define ICH9_APM_CNT 0xB2
#define ICH9_APM_STS 0xB3
#define ICH9_APM_CNT 0xB2
#define ICH9_APM_CNT_CPU_HOTPLUG 0x04
#define ICH9_APM_STS 0xB3
#define ICH9_CPU_HOTPLUG_BASE 0x0CD8